CN119371159A - Cement-based self-leveling material based on fully recycled sand powder from shield slag, preparation method and application thereof - Google Patents
Cement-based self-leveling material based on fully recycled sand powder from shield slag, preparation method and application thereof Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 197
- 239000000843 powder Substances 0.000 title claims abstract description 192
- 239000000463 material Substances 0.000 title claims abstract description 123
- 239000004568 cement Substances 0.000 title claims abstract description 90
- 239000002893 slag Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 208
- 239000002689 soil Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000010881 fly ash Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 20
- 229920001971 elastomer Polymers 0.000 claims abstract description 20
- 239000000701 coagulant Substances 0.000 claims abstract description 15
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 26
- 238000012216 screening Methods 0.000 claims description 25
- 238000005406 washing Methods 0.000 claims description 21
- 239000002518 antifoaming agent Substances 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 12
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 4
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 4
- 239000002956 ash Substances 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 claims 1
- 239000006004 Quartz sand Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 34
- 239000000203 mixture Substances 0.000 description 31
- 238000012360 testing method Methods 0.000 description 14
- 238000004064 recycling Methods 0.000 description 12
- 238000009472 formulation Methods 0.000 description 9
- 238000001035 drying Methods 0.000 description 8
- 238000011056 performance test Methods 0.000 description 7
- 239000004567 concrete Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000011049 filling Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000009775 high-speed stirring Methods 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical group C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 2
- 206010016807 Fluid retention Diseases 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000176 sodium gluconate Substances 0.000 description 2
- 235000012207 sodium gluconate Nutrition 0.000 description 2
- 229940005574 sodium gluconate Drugs 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The self-leveling material is prepared by mixing recycled sand powder recycled from shield slag soil serving as a raw material with cement, fly ash, silica fume, an expanding agent, a water reducing agent, cellulose ether, rubber powder, a coagulant, the recycled sand powder and water, and can generate good fluidity, tensile bonding strength and stability, and the impact resistance, the compressive breaking strength and the like can meet the standard requirements. The self-leveling material greatly reduces the use of natural sand, machine-made sand and quartz sand powder, saves resources, obviously improves the utilization rate of shield slag soil resources, and solves the problems of high disposal difficulty, high cost and the like of the slag soil of the track traffic engineering in China. The self-leveling material also comprises about 10 percent of fly ash, which is also industrial and construction waste, and has low price, thereby being beneficial to environmental protection and further reducing the cost. The invention has good environmental and social economic benefits.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a cement-based self-leveling material based on shield slag soil full-recovery sand powder, and a preparation method and application thereof.
Background
With the rapid development of track traffic, the amount of dregs generated by shield tunnel construction is also increasing year by year. The related data show that the amount of waste mud and dregs discharged in the engineering in China is over 20 hundred million tons each year, and the amount of the waste mud and the dregs accounts for more than 60% of the total amount of the construction waste. It is counted that the residual mud and residue soil generated in subway engineering in China is rapidly increased from 16 million cubic meters in 1965 to 6882 million cubic meters in 2018, and is expected to break through 2 million cubic meters in 2030. However, most of the residual sludge is not reasonably and effectively utilized. In the disposal of main cities in China, more than 80% of residual mud and residue soil is mainly buried, and only less than 20% of residual mud and residue soil is used for engineering and mountain piling and landscaping. It is estimated that the land area occupied by the nationwide residue and residue landfills in 2017 is approximately 20 square kilometers. Therefore, research on the technology of efficiently recycling the engineering residual mud and the dregs is developed, and the method has actual engineering requirements and important social environmental effects.
The cement-based self-leveling material is mortar prepared by mixing cement serving as a cementing material, and proper additives, fine sand, fillers and the like. In the dry mix, the fine aggregate is required in a large amount as a main component thereof. However, the main sources of fine aggregates used in the conventional self-leveling materials are river sand, quartz sand and machine-made sand, which consume a great amount of natural resources. In order to protect ecological environment, the exploitation of river sand is limited, the price of quartz sand is relatively expensive, the production of machine-made sand mainly depends on the exploitation and crushing of natural rock or ore, and the process can produce sand materials meeting certain standards, but also consumes natural resources, and the energy consumption in the production process is higher. With the increasing importance of China on the utilization of construction waste resources, the engineering world has increasingly demanded alternatives for reducing the use amount of the materials so as to reduce engineering cost and reduce the consumption of sand resources. The self-leveling mortar is prepared from the fly ash serving as a main raw material and the pulverized refractory bricks serving as aggregates in CN111875318A, so that the use amount of river sand is reduced, the working performance and strength of the material are improved, and the shrinkage of the material is reduced. The method has the following defects that 1) the requirements on mainly consumed fly ash are high, I high-grade fly ash is used, the fly ash is the part with highest quality and small proportion in the fly ash, other larger amount of fly ash with lower quality cannot be consumed, 2) the grain diameter in the material proportion is large, the mobility of self-leveling materials is relatively poor, 3) the glue sand in the material proportion is relatively high, the performance of the glue material is reflected by more materials, the material cost is too high, and the economic aspect is insufficient. CN114853435A provides cement mortar grouting material prepared from magic crystal powder, and the cement mortar grouting material has lower glue sand and better working performance, but has the following defects that 1) strength is relatively low, 2) the requirement on sand is high, fine sand in natural river sand is adopted, 3) cost is relatively high, 4) various liquid materials are contained in the material proportion of the method, and the method is very inconvenient to use in storage, transportation and engineering sites.
The self-leveling material based on the full recovery of the residual mud of the shield slag soil and the preparation method thereof are developed, and the recovered sand powder is obtained by carrying out water washing, drying, screening and other process treatments on the residual mud of the shield slag soil in the shield engineering. Because the residual mud of the shield slag soil has the characteristics of larger mud content and finer grain diameter, the residual mud is difficult to effectively utilize at present, and the disposal faces the problems of high cost, environmental pollution, land occupation and the like. The invention innovatively provides that the residue soil reclaimed sand is used for self-leveling materials, the prepared materials have stable performance, the process realizes the reutilization of the fine particle residue soil, the cost is low, the source is wide, the exploitation and consumption of natural resources such as river sand, quartz sand, machine-made sand and the like are reduced, and the invention has remarkable environmental and social economic benefits.
Disclosure of Invention
Aiming at the prior art problems, the invention provides a cement-based self-leveling material based on shield slag soil fully-recovered sand powder, a preparation method and application thereof, wherein the cement-based self-leveling material has good fluidity, tensile bonding strength and stability, impact resistance, compressive flexural strength and the like all meet the standard requirements, meanwhile, the technology greatly reduces the dependence on river sand, quartz sand and machine-made sand, reduces the cost, realizes the efficient recycling of engineering slag soil, and simultaneously ensures that the obtained self-leveling material meets the main performance index requirements of the standard requirements.
In a first aspect, the invention provides a cement-based self-leveling material based on shield slag soil full-recovery sand powder, which comprises cement, fly ash, silica fume, a water reducing agent, cellulose ether, rubber powder, a coagulant and recovered sand powder in parts by weight.
Further, the cement-based self-leveling material based on the shield residue soil fully-recovered sand powder comprises, by mass, 470-510 parts of cement, 130-160 parts of fly ash, 10-30 parts of silica fume, 1-3 parts of a water reducer, 1-3 parts of cellulose ether, 10-20 parts of rubber powder, 1-3 parts of a coagulant and 600-800 parts of recovered sand powder.
Further, the mud content of the reclaimed sand powder is less than or equal to 10%, the particle size range of the reclaimed sand powder is 0.075-2.36 mm, and the mass ratio of the reclaimed sand powder below 0.15mm is more than or equal to 65%.
Further, the cement is Portland cement, and the cement grade is not lower than 42.5R.
Further, the fly ash is class II fly ash.
Further, the silica fume grade is not lower than SF92.
Further, the water reducer is a polycarboxylate water reducer, preferably a polycarboxylate water reducer 325C, and powder.
Further, the cellulose ether is hydroxypropyl methylcellulose.
Further, the rubber powder is redispersible latex powder.
Further, the coagulant is one or more selected from lithium carbonate, lithium hydroxide, lithium chloride, aluminum sulfate and sodium aluminate;
preferably, the accelerator is sodium aluminate (CAS number 11138-49-1).
Furthermore, the raw materials of the cement-based self-leveling material based on the shield residue soil full-recovery sand powder can also comprise an expanding agent and a defoaming agent.
Further, the expanding agent is one or more selected from plastic expanding agent, calcium sulfoaluminate, calcium oxide and magnesium oxide;
preferably, the expanding agent is magnesium oxide.
Further, the defoamer is a polyether defoamer, preferably a DF65 model defoamer.
Further, the cement-based self-leveling material based on the shield residue soil fully-recovered sand powder comprises, by mass, 470-510 parts of cement, 130-160 parts of fly ash, 10-30 parts of silica fume, 0.1-50 parts of an expanding agent, 1-3 parts of a water reducing agent, 0.1-1 part of a defoaming agent, 1-3 parts of cellulose ether, 10-20 parts of rubber powder, 1-3 parts of a coagulant and 600-800 parts of recovered sand powder.
Further, the recycled sand powder in the cement-based self-leveling material raw material based on the fully recycled sand powder of the shield slag soil is derived from the shield slag soil residual mud of the track traffic construction site, and the concrete preparation steps comprise:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove large stones such as organic impurities, boulders and the like;
(2) Washing the shield slag soil screened in the step (1), and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) The sand powder washed in the step (2) is dried until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3), wherein the aperture of a screen is 2.36mm, and obtaining the sand powder in the middle section (the grain diameter is less than 2.36mm and mud is washed away), namely the recovered sand powder.
Further, the washing in the step (2) adopts a sand washer, including but not limited to impeller sand washer and other devices.
Further, the drying step in the step (3) includes, but is not limited to, natural drying or drying in a drum dryer.
Further, the screening device in the step (4) includes, but is not limited to, a sieving machine and the like.
In a second aspect, the invention also provides a preparation method of the cement-based self-leveling material based on the shield slag soil fully-recovered sand powder, which comprises the following steps:
s1, mixing and stirring raw materials except the reclaimed sand powder according to a proportion, wherein the stirring time is 1-2 min;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
In a third aspect, the invention also provides a construction method of the cement-based self-leveling material based on the shield slag soil full-recovery sand powder, which comprises the steps of mixing and stirring the cement-based self-leveling material based on the shield slag soil full-recovery sand powder with water according to the mass ratio of (1400-1800) (380-420) for construction.
The invention provides a self-leveling material which is prepared from cement, fly ash, silica fume, an expanding agent, a water reducing agent, a defoaming agent, cellulose ether, rubber powder, a coagulant, reclaimed sand powder and water serving as main raw materials and used for replacing the self-leveling material based on the reclaimed sand powder. Cement is used as a cementing material, reclaimed sand powder is used as fine aggregate, fly ash is used as a filler, the fluidity of the self-leveling material can be improved, the compactness of the self-leveling material is enhanced, the shrinkage and cracking of concrete are effectively inhibited, and the specific surface area of the fly ash is large, so that the cohesiveness and the water retention can be increased, and segregation and bleeding can be prevented. The proper amount of silica fume can play the roles of physical filling and promoting the hydration of the cementing material. Water reducing agents, rubber powders, setting accelerators, swelling agents, cellulose ethers, etc. are added to improve the flowability, cohesive strength, shrinkage properties and water retention of the material.
Compared with the prior art, the invention has the following beneficial effects:
(1) The self-leveling material based on the fully recovered sand powder meets the main physical and mechanical property requirements of self-leveling mortar, the 28d compressive strength is more than or equal to 6.0MPa, and the 1d flexural strength is more than or equal to 2.0MPa;
(2) The self-leveling material based on the fully recovered sand powder adopts the materials such as the polycarboxylate water reducer, the fly ash, the silica fume, the water reducer and the like to be matched to improve the fluidity and the stability of the self-leveling material in the molding stage. The slurry meets the requirement that the fluidity is more than 130 mm.
(3) The self-leveling material based on the fully recovered sand powder adopts the expanding agent and the like to control the dimensional change rate to be between minus 0.15 and plus 0.15 hours, thereby being beneficial to reducing the cracking risk of the self-leveling mortar.
(4) The tensile bonding strength of the self-leveling material based on the fully recovered sand powder is more than or equal to 1.0MPa, which is beneficial to that the bonding interface does not generate hollowness, cracking and falling under the action of tensile stress caused by various deformations.
(5) The invention fully utilizes the fully recovered sand powder, can reduce the consumption of natural sand, quartz sand and machine-made sand, can realize the efficient and high-attachment recycling of the engineering residue soil and residual mud, can reduce the consumption of natural resources, reduces the cost, and has good environmental and social economic benefits.
Detailed Description
The experimental methods of the present invention, in which specific conditions are not specified in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The various chemicals commonly used in the examples are commercially available.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps is not limited to the elements or modules listed but may alternatively include additional steps not listed or inherent to such process, method, article, or device.
The present invention will be further described in detail with reference to the following embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The raw materials and sources in the embodiment of the invention are specifically as follows:
The cement is P-II42.5R silicate cement produced by Huarun cement (Pinnan) limited company, the fly ash is class C II fly ash produced by Shaog Koch GmbH Jiang Ouwu Dan Gang limited company, the silica ash is silica ash provided by Guangdong Gatt novel material science and technology limited company, the expanding agent is high-performance concrete magnesia expanding agent of Jiangsu Su Bote novel material stock limited company, the water reducing agent is Sikapolycarboxylic acid water reducing agent 325C, powder, the defoaming agent is Chongqing Hayu chemical industry product limited company, DF65 type defoaming agent, the cellulose ether is PL600 hydroxypropyl methylcellulose produced by Chongqing Pengpen Kai fine chemical industry limited company, the rubber powder is Hydetech redispersible latex powder produced by Wake chemical (China) limited company, and the coagulant is sodium aluminate (CAS number is 11138-49-1).
Example 1 preparation of Cement-based self-leveling Material based on Shield slag Total recovery of Sand powder
The raw material formulation of the cement-based self-leveling material based on the shield slag soil fully-recovered sand powder in the embodiment is shown in table 1:
TABLE 1 raw material formulation of cement-based self-leveling material based on shield slag soil full-recovery sand powder
| Raw material composition | Content (parts by mass) |
| Cement and its preparation method | 490 |
| Fly ash | 147 |
| Silica fume | 21 |
| Expanding agent | 42 |
| Water reducing agent | 2.1 |
| Defoaming agent | 0.35 |
| Cellulose ether | 2.1 |
| Rubber powder | 14 |
| Coagulant agent | 2.1 |
| Recovered sand powder | 700 |
The preparation process of the reclaimed sand powder comprises the following steps:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove large stones such as organic impurities, boulders and the like;
(2) Washing the shield slag soil screened in the step (1) by adopting an impeller sand washer, and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) Naturally airing the sand powder washed in the step (2) or drying the sand powder by a roller dryer until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3) by adopting a vibration screening method, wherein the aperture of a screen is 2.36mm, and obtaining the sand powder of the middle section (the grain diameter is less than 2.36mm and mud is washed away), namely the recovered sand powder, wherein the mud content of the recovered sand powder is less than or equal to 10%, the grain diameter range of the recovered sand powder is 0.075-2.36 mm, and the mass ratio of the recovered sand powder below 0.15mm is more than or equal to 65%.
The preparation method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder comprises the following steps:
S1, mixing and stirring cement, fly ash, silica fume, an expanding agent, a water reducing agent, a defoaming agent, cellulose ether, rubber powder and coagulant powder according to a proportion, wherein the stirring time is 1-2 minutes;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
The construction method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder of the embodiment comprises the following steps:
Adding water (399 parts by mass) into the cement-based self-leveling material based on the shield slag soil full-recovery sand powder, mixing for 1min, stopping stirring, scraping off uneven mixture on stirring blades and the material pot wall by a scraper within 30s, then rapidly stirring for 60s, standing for 60s, continuing high-speed stirring for 15s, standing for 60s to enable the mixture to be defoamed if bubbles exist, and immediately filling the mixture into a die.
Example 2 preparation of Cement-based self-leveling Material based on Shield slag Total recovery of Sand powder
The raw material formulation of the cement-based self-leveling material based on the shield slag soil fully-recovered sand powder of the embodiment is shown in table 2:
TABLE 2 raw material formulation of cement-based self-leveling material based on shield slag soil full-recovery sand powder
| Raw material composition | Content (parts by mass) |
| Cement and its preparation method | 490 |
| Fly ash | 160 |
| Silica fume | 8 |
| Expanding agent | 42 |
| Water reducing agent | 2.1 |
| Defoaming agent | 0.35 |
| Cellulose ether | 2.1 |
| Rubber powder | 14 |
| Coagulant agent | 2.1 |
| Recovered sand powder | 700 |
The preparation process of the reclaimed sand powder comprises the following steps:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove large stones such as organic impurities, boulders and the like;
(2) Washing the shield slag soil screened in the step (1) by adopting an impeller sand washer, and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) Naturally airing the sand powder washed in the step (2) or drying the sand powder by a roller dryer until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3) by adopting a vibration screening method, wherein the aperture of a screen is 2.36mm, and obtaining the sand powder in the middle section (the grain diameter is less than 2.36mm and mud is washed away), namely the recovered sand powder. The mud content of the reclaimed sand powder is less than or equal to 10%, the grain size range of the reclaimed sand powder is 0.075-2.36 mm, and the mass ratio of the reclaimed sand powder below 0.15mm is more than or equal to 65%.
The preparation method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder comprises the following steps:
S1, mixing and stirring cement, fly ash, silica fume, an expanding agent, a water reducing agent, a defoaming agent, cellulose ether, rubber powder and coagulant powder according to a proportion, wherein the stirring time is 1-2 minutes;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
The construction method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder of the embodiment comprises the following steps:
Adding water (399 parts by mass) into the cement-based self-leveling material based on the shield slag soil full-recovery sand powder, mixing for 1min, stopping stirring, scraping off uneven mixture on stirring blades and the material pot wall by a scraper within 30s, then rapidly stirring for 60s, standing for 60s, continuing high-speed stirring for 15s, standing for 60s to enable the mixture to be defoamed if bubbles exist, and immediately filling the mixture into a die.
Example 3 preparation of Cement-based self-leveling Material based on Shield slag Total recovery of Sand powder
The raw material formulation of the cement-based self-leveling material based on the shield slag soil fully-recovered sand powder of the embodiment is shown in table 3:
TABLE 3 raw material formulation of cement-based self-leveling material based on shield slag soil full-recovery sand powder
The preparation process of the reclaimed sand powder comprises the following steps:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove large stones such as organic impurities, boulders and the like;
(2) Washing the shield slag soil screened in the step (1) by adopting an impeller sand washer, and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) Naturally airing the sand powder washed in the step (2) or drying the sand powder by a roller dryer until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3) by adopting a vibration screening method, wherein the aperture of a screen is 2.36mm, and obtaining the sand powder in the middle section (the grain diameter is less than 2.36mm and mud is washed away), namely the recovered sand powder. The mud content of the reclaimed sand powder is less than or equal to 10%, the grain size range of the reclaimed sand powder is 0.075-2.36 mm, and the mass ratio of the reclaimed sand powder below 0.15mm is more than or equal to 65%.
The preparation method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder comprises the following steps:
S1, mixing and stirring cement, fly ash, silica fume, an expanding agent, a water reducing agent, a defoaming agent, cellulose ether, rubber powder and coagulant powder according to a proportion, wherein the stirring time is 1-2 minutes;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
The construction method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder of the embodiment comprises the following steps:
Adding water (399 parts by mass) into the cement-based self-leveling material based on the shield slag soil full-recovery sand powder, mixing for 1min, stopping stirring, scraping off uneven mixture on stirring blades and the material pot wall by a scraper within 30s, then rapidly stirring for 60s, standing for 60s, continuing high-speed stirring for 15s, standing for 60s to enable the mixture to be defoamed if bubbles exist, and immediately filling the mixture into a die.
Example 4 preparation of Cement-based self-leveling Material based on Shield slag Total recovery of Sand powder
The raw material formulation of the cement-based self-leveling material based on the shield slag soil fully-recovered sand powder of the embodiment is shown in table 4:
TABLE 4 raw material formulation of cement-based self-leveling material based on shield slag soil full-recovery sand powder
The preparation process of the reclaimed sand powder comprises the following steps:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove large stones such as organic impurities, boulders and the like;
(2) Washing the shield slag soil screened in the step (1) by adopting an impeller sand washer, and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) Naturally airing the sand powder washed in the step (2) or drying the sand powder by a roller dryer until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3) by adopting a vibration screening method, wherein the aperture of a screen is 2.36mm, and obtaining the sand powder in the middle section (the grain diameter is less than 2.36mm and mud is washed away), namely the recovered sand powder. The mud content of the reclaimed sand powder is less than or equal to 10%, the grain size range of the reclaimed sand powder is 0.075-2.36 mm, and the mass ratio of the reclaimed sand powder below 0.15mm is more than or equal to 65%.
The preparation method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder comprises the following steps:
s1, mixing and stirring cement, fly ash, silica fume, a water reducing agent, cellulose ether and rubber powder according to a proportion for 1min;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
The construction method of the cement-based self-leveling material based on the shield slag soil full-recycling sand powder of the embodiment comprises the following steps:
Adding water (420 parts by mass) into a cement-based self-leveling material based on shield slag soil full-recovery sand powder, mixing, slowly stirring for 1min, stopping stirring, scraping off uneven mixture on stirring blades and a material pot wall by a scraper within 30s, rapidly stirring for 60s, standing for 60s, continuing high-speed stirring for 15s, standing for 60s to enable the mixture to be defoamed if bubbles exist, and immediately filling the mixture into a die.
Test example one, performance test of Cement-based self-leveling Material based on full Shield slag soil recovery Sand powder
First part, test method
The construction performance test of the cement-based self-leveling material based on the shield residue soil fully-recovered sand powder prepared in the examples 1-4 is carried out, wherein specific test indexes comprise a fluidity test, a tensile bonding strength test and a dimensional change rate, and the test method refers to the specification JC/T985-2017 of cement-based self-leveling mortar for the ground.
Second part, results of Performance test
According to the test method of the first part, the performance test results are shown in Table 5;
TABLE 5 Cement-based self-leveling material workability test results based on shield slag soil fully recovered sand powder prepared in examples 1-4
As can be seen from the performance test results of Table 5, the cement-based self-leveling material based on the shield residue soil fully recovered sand powder adopted in examples 1-4 has the fluidity of 130mm and above, good workability, spreadability and surface quality, can meet the requirements of flatness and aesthetic degree, has good consolidation strength, the compressive strength of 1d is more than or equal to 2MPa, the compressive strength of 28d is more than or equal to 6MPa, and meets the main physical and mechanical property requirements of the self-leveling material.
Comparative examples 1 to 6
The cement-based self-leveling materials based on the shield residue soil fully-recovered sand powder in comparative examples 1-6 are different in raw material composition and content, and the specific formula is shown in Table 6:
TABLE 6 raw material formulation (parts by mass) of cement-based self-leveling material based on shield slag soil full-recovery sand powder
Note that the retarder in the table is sodium gluconate (model q162sxw 005).
According to the formula of Table 6, the preparation method and the construction steps of the cement-based self-leveling material of comparative examples 1-6 based on the shield residue soil fully recovered sand powder are identical to those of example 4, and the mixing water content in the construction process of comparative examples 1-6 is 490, 420, 350, 385, 399 and 399 parts by mass in sequence.
Test example II and comparative examples 1-8 Cement-based self-leveling material construction performance test of fully recovered sand powder of shield slag soil
The concrete test indexes and the concrete test methods are consistent with the test examples, and the experimental results are shown in Table 7:
TABLE 7 Cement-based self-leveling material workability test results for the shield slag soil fully recovered sand powder prepared in comparative examples 1 to 6
As can be seen from the construction performance test results of Table 7, the self-leveling materials based on the fully recovered sand powder prepared in comparative examples 1 to 6 are inferior in performance compared with examples 1 to 4, mainly because the comparative example 1 is free from adding the water reducing agent, even though the water cement ratio is high, the fluidity is lower than the specification requirement, the 0.2% water reducing agent is doped in comparative example 2 after adjustment, but segregation problem occurs, the cellulose ether thickening agent is doped in comparative example 3 to 5 after adjustment again, the doping amount of the water reducing agent and the thickening agent is adjusted in consideration of the synergistic effect of the thickening agent and the water reducing agent, the water addition amount is adjusted until the fluidity of the self-leveling slurry meets the specification requirement, segregation phenomenon does not occur, but the comparative examples 4 to 5 are free from adding the setting accelerator and the swelling agent in comparative example 1, so that the flexural strength of the first day does not meet the specification requirement, and the tensile bond strength of the comparative example 2 is also not met due to the excessively low doping amount of the rubber powder, the tensile bond strength of the comparative example 6 is doped in 0.3%, thus the fluidity of 20min is not greatly increased, the fluidity of the water reducing agent and the swelling agent does not meet the specification requirement of the comparative example 6, and the tensile bond strength of the comparative example is not met, and the tensile strength of the comparative example is not met by the specification requirement of the tensile strength is not met, and the tensile strength is not meets the specification requirement of the specification requirement is relatively high.
Comparative example 7
The difference between the comparative example and the example 1 is that the parameters of the reclaimed sand powder are different, the preparation process of the reclaimed sand powder of the comparative example is basically the same as that of the example 1, the difference is that the size of the screening particle diameter in the step (3) is different, the parameters of the reclaimed sand powder obtained in the comparative example are that the mud content is less than or equal to 10%, the particle size range of the reclaimed sand powder is 0.25-0.5 mm, and the mass ratio of the reclaimed sand powder below 0.35mm is more than or equal to 80%.
Other raw materials have the same composition and addition amount, and the preparation method and the construction method are the same.
Comparative example 8
The comparative example differs from example 1 in that the accelerator was replaced with an equivalent amount of retarder (sodium gluconate, model q162sxw 005) and the other materials were identical in composition and addition, as well as in preparation and construction.
Comparative example 9
The comparative example is different from example 1 in that the water reducing agent is 0.7 part by mass, the cellulose ether is 3.5 parts by mass, and other raw materials have the same composition and addition amount, and the preparation method and the construction method are the same.
Comparative example 10
The comparative example is different from example 1 in that the water reducing agent is 3.5 parts by mass, the cellulose ether is 0.7 part by mass, and other raw materials have the same composition and addition amount, and the preparation method and the construction method are the same.
Comparative example 11
The comparative example is different from example 1 in that the rubber powder is 7 parts by mass, the reclaimed sand powder is adopted to complement the parts by mass, the composition and the addition amount of other raw materials are consistent, and the preparation method and the construction method are the same.
Comparative example 12
The comparative example is different from example 1 in that the rubber powder is 25 parts by mass, the reclaimed sand powder is 689 parts by mass, the other raw materials have the same composition and additive amount, and the preparation method and the construction method are the same.
Test example III, comparative examples 7-12 Cement-based self-leveling material workability test of fully recovered sand powder of shield slag soil
The concrete test indexes and the concrete test methods are consistent with the test examples, and the experimental results are shown in Table 8:
TABLE 8 Cement-based self-leveling material workability test results for the shield slag soil fully recovered sand powder prepared in comparative examples 7 to 12
As shown in Table 8, the cement-based self-leveling materials prepared in comparative examples 7 to 12 have significantly reduced post-construction performance compared with example 1, particularly when the prepared reclaimed sand particles have larger diameters, the obtained materials have significantly reduced fluidity and significantly reduced self-leveling property, when the raw materials do not contain coagulants, the fracture-resistant compressive strength can seriously meet the standard requirements, when the addition amount of the water reducer and the cellulose ether in the raw materials exceeds the proper range, the materials are easy to cause segregation problems and influence the fluidity and the fracture-resistant compressive strength of the materials, and in addition, when the rubber powder in the raw materials exceeds the proper range, the tensile bonding strength of the materials is greatly influenced, and the fracture-resistant compressive strength of the materials is also influenced to a certain extent.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The cement-based self-leveling material based on the shield slag soil fully-recovered sand powder is characterized by comprising, by mass, 470-510 parts of cement, 130-160 parts of fly ash, 10-30 parts of silica fume, 1-3 parts of a water reducer, 1-3 parts of cellulose ether, 10-20 parts of rubber powder, 1-3 parts of a coagulant and 600-800 parts of recovered sand powder.
2. The cement-based self-leveling material based on shield residue soil fully-recovered sand powder, which is disclosed in claim 1, is characterized in that the particle size range of the recovered sand powder is 0.075-2.36 mm, and the mud content of the recovered sand powder is less than or equal to 10%.
3. The cement-based self-leveling material based on shield residue soil fully-recovered sand powder, which is disclosed in claim 2, wherein the mass ratio of the recovered sand powder below 0.15mm in the recovered sand powder is more than or equal to 65%.
4. The cement-based self-leveling material based on shield residue soil full-recovery sand powder, which is disclosed in claim 1, is characterized in that cement is Portland cement, the cement grade is not lower than 42.5R, the fly ash is class II fly ash, the silica ash grade is not lower than SF92, the water reducing agent is a polycarboxylate water reducing agent, the cellulose ether is hydroxypropyl methyl cellulose, the rubber powder is redispersible emulsion powder, and the coagulant is one or more selected from lithium carbonate, lithium hydroxide, lithium chloride, aluminum sulfate and sodium aluminate.
5. The cement-based self-leveling material based on shield residue soil fully recovered sand powder of claim 1, wherein the cement-based self-leveling material raw material further comprises an expanding agent and a defoaming agent.
6. The cement-based self-leveling material based on the shield residue soil fully recovered sand powder, which is disclosed in claim 5, is characterized in that the expanding agent is 0.1-50 parts by weight, and the defoaming agent is 0.1-1 part by weight.
7. The cement-based self-leveling material based on the shield residue soil fully recovered sand powder, which is disclosed in claim 5, is characterized in that the expanding agent is one or more selected from plastic expanding agent, calcium sulfoaluminate, calcium oxide and magnesium oxide, and the defoaming agent is polyether type defoaming agent.
8. The cement-based self-leveling material based on shield residue soil total recovery sand powder according to any one of claims 1 to 7, wherein the recovery sand powder is derived from shield residue soil residual mud of a track traffic construction site, and the preparation steps comprise:
(1) Removing large stones, metal impurities and fine sand of mud in shield residue soil residual mud of a track traffic construction site by a water washing method and a screening method, and then performing coarse screening to remove organic impurities and boulders;
(2) Washing the shield slag soil screened in the step (1), and controlling the washing time according to the mud containing condition of the shield slag soil, so that the surface of the sand powder at the outlet of the material is cleaner and has no obvious mud mark;
(3) The sand powder after the water washing in the step (2) is dried until the water content is less than 10%, so that the sand powder has good dispersibility;
(4) Screening the sand powder dried in the step (3), wherein the aperture of the screen is 2.36mm, and obtaining the sand powder, namely the recovered sand powder.
9. A method for preparing the cement-based self-leveling material based on shield slag soil full-recovery sand powder according to any one of claims 1 to 8, which is characterized by comprising the following preparation steps:
s1, mixing and stirring raw materials except the reclaimed sand powder according to a proportion, wherein the stirring time is 1-2 min;
s2, adding the recycled sand powder into the step S1 for stirring for 4-6 min to obtain the cement-based self-leveling material based on the fully recycled sand powder of the shield slag soil.
10. The application of the cement-based self-leveling material based on the shield residue soil full-recovery sand powder is characterized in that the cement-based self-leveling material based on the shield residue soil full-recovery sand powder is constructed after being mixed and stirred with water according to the mass ratio of (1400-1800) to (380-420).
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