CN113816679A - Lean concrete applied to complex geological environment and preparation process thereof - Google Patents
Lean concrete applied to complex geological environment and preparation process thereof Download PDFInfo
- Publication number
- CN113816679A CN113816679A CN202111124769.0A CN202111124769A CN113816679A CN 113816679 A CN113816679 A CN 113816679A CN 202111124769 A CN202111124769 A CN 202111124769A CN 113816679 A CN113816679 A CN 113816679A
- Authority
- CN
- China
- Prior art keywords
- portions
- complex geological
- fiber
- geological environment
- cracking agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 89
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000005336 cracking Methods 0.000 claims abstract description 72
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 63
- 239000012784 inorganic fiber Substances 0.000 claims abstract description 62
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 239000004576 sand Substances 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 35
- 239000010881 fly ash Substances 0.000 claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000011490 mineral wool Substances 0.000 claims abstract description 25
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 24
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical class O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims abstract description 24
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 43
- 239000004575 stone Substances 0.000 claims description 31
- 238000003756 stirring Methods 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 16
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000009435 building construction Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000002893 slag Substances 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- OCKPCBLVNKHBMX-UHFFFAOYSA-N butylbenzene Chemical compound CCCCC1=CC=CC=C1 OCKPCBLVNKHBMX-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 229940035429 isobutyl alcohol Drugs 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- LGCMKPRGGJRYGM-UHFFFAOYSA-N Osalmid Chemical compound C1=CC(O)=CC=C1NC(=O)C1=CC=CC=C1O LGCMKPRGGJRYGM-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002968 anti-fracture Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical group C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005829 trimerization reaction 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/40—Asbestos
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4618—Oxides
- C04B14/4625—Alumina
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/30—Condensation polymers of aldehydes or ketones
- C04B24/305—Melamine-formaldehyde condensation polymers
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses lean concrete applied to a complex geological environment and a preparation process thereof. The lean concrete applied to the complex geological environment is mainly prepared from the following raw materials in parts by weight: 1300 portions of gravel, 800 portions of sand, 50 to 80 portions of fly ash, 5 to 10 portions of inorganic fiber, 180 portions of cement, 100 portions of water, 130 portions of water reducing agent, 3 to 5 portions of anti-cracking agent and 12 to 25 portions of anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15). The lean concrete applied to the complex geological environment can be used for building construction of the complex geological environment and has the advantages of cracking resistance and deformation resistance.
Description
Technical Field
The application relates to the technical field of concrete, in particular to lean concrete applied to complex geological environment and a preparation process thereof.
Background
The lean concrete is a mixture composed of water, ordinary portland cement, sand, broken stone and an additive, and has high strength, rigidity and durability after being coagulated and hardened. In addition, the lean concrete has low cement content and low economic cost, and has good application scenes in the construction fields of roads, airports and the like.
Compared with base layer materials such as stable base layer materials and lime-fly-ash macadam base layer materials, the lean concrete has a porous structure, is good in compressive strength, bending resistance and scouring resistance, and plays a great role in road construction.
Chinese patent application publication No. CN112830737A discloses a multi-admixture steel slag lean concrete base material, comprising the following components: water, a cementing material, steel slag coarse aggregate, pebbles, steel slag sand and a water reducing agent; the weight ratio of water, gelled material, steel slag coarse aggregate, pebble, steel slag sand and water reducing agent in each cubic meter of steel slag lean concrete base material is 165-175, 206-219, 805-820, 642-654, 925-942 and 2.48-2.63. By using the steel slag to replace partial cement, natural sand and broken stone, the lean concrete with high strength and good construction performance is prepared, the engineering cost is saved, the utilization rate of the steel slag is improved, and the bearing capacity of a pavement base is improved.
In view of the above-mentioned multi-admixture steel slag lean concrete base material, the inventor believes that the anti-cracking performance is poor when the multi-admixture steel slag lean concrete base material is applied in a complex geological environment.
Disclosure of Invention
In order to improve the anti-cracking performance of the lean concrete, the application provides the lean concrete applied to a complex geological environment and a preparation process thereof.
In a first aspect, the present application provides a lean concrete for use in a complex geological environment, which adopts the following technical scheme:
lean concrete applied to complex geological environment is mainly prepared from the following raw materials in parts by weight: 1300 portions of gravel, 800 portions of sand, 50 to 80 portions of fly ash, 5 to 10 portions of inorganic fiber, 180 portions of cement, 100 portions of water, 130 portions of water reducing agent, 3 to 5 portions of anti-cracking agent and 12 to 25 portions of anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
By adopting the technical scheme, the raw materials of the concrete are uniformly mixed to form a mortar gel system, and the rock wool fibers, the alumina ceramic fibers and the basalt fibers in the inorganic fibers are uniformly dispersed in the mortar gel system to form a three-dimensional network structure, so that the aggregate such as broken stone and sand is well supported, the surface precipitation rate of the mortar gel system and the layering and segregation rate of the mortar gel system are reduced, and the micro-cracks are greatly reduced. In addition, the vinyl trimethoxy silane, the perhydropolysilazane and the methylated melamine formaldehyde resin in the anti-cracking agent can be uniformly adsorbed on the surface of solid particles in a gel system, so that the contact area of a cement gel material and water is reduced, and cracking of a part of the gel system caused by plastic shrinkage is eliminated. In addition, the gel material can also play a synergistic role with inorganic fibers, so that relatively comprehensive embedding and coating are formed among solid particles in a gel system, a certain delayed coagulation effect is achieved, a part of shrinkage internal stress generated in the gel system can be offset, the shrinkage and cracking of the gel system are limited, the cracking probability of concrete is greatly reduced, and the adaptability of the concrete to complex geological environments is improved.
Preferably, the feed is mainly prepared from the following raw materials in parts by weight: 1400-1500 parts of gravel, 750 parts of sand 680-750 parts of fly ash, 6.5-8 parts of inorganic fiber, 170 parts of cement, 120 parts of water, 3.5-4 parts of a water reducing agent and 15-22 parts of an anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
By adopting the technical scheme, the proportion of each component is adjusted and optimized, the compatibility of each raw material is improved, the porosity of a gel system is more uniform, and the mechanical property of concrete is better.
Preferably, the anti-cracking agent consists of vinyl trimethoxy silane, perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (1-3) to (2.5-4) to (12-15).
By adopting the technical scheme, the composition proportion of the anti-cracking agent is further optimized, so that the coating state of the anti-cracking agent in a gel system is better, a better bonding structure can be formed among solid particles, the anti-cracking agent and inorganic fibers are interwoven into a microfiber-three-dimensional net structure, and the anti-cracking performance of concrete is further improved.
Preferably, the mass ratio of the crushed stone to the anti-cracking agent is (60-108): 1.
By adopting the technical scheme, the proportion of the broken stone and the anti-cracking agent is adjusted, so that the network structure in the gel system is more perfect, the generation and development of micro cracks in the gel system are limited, and the restraint effect on concrete is stronger.
Preferably, the inorganic fiber consists of rock wool fiber, alumina ceramic fiber and basalt fiber in the mass ratio of (5-10) to (0.8-1.5) to (2-5).
By adopting the technical scheme, the composition ratio of the inorganic fibers is optimized and adjusted, and the mechanical property characteristics of different fibers are integrated, so that the overall tensile modulus of the inorganic fibers is more suitable, and the cracking resistance of the concrete is further improved.
Preferably, the inorganic fibers are soaked in a solution of glycidyl methacrylate.
By adopting the technical scheme, after the inorganic fiber is soaked in the glycidyl methacrylate solution, the glycidyl methacrylate can be adhered and combined on the surface of the inorganic fiber, so that groups such as ester groups are provided for the inorganic fiber, the workability of the inorganic fiber is improved, and the binding force between the inorganic fiber and solid particles in a gel system is enhanced.
Preferably, the raw materials also comprise (3-7) parts by weight of ceramsite.
By adopting the technical scheme, the ceramsite with a proper proportion is added and uniformly dispersed in the gel system, so that the compressive strength of the concrete is further improved, and the service performance of the concrete is improved.
In a second aspect, the present application provides a preparation process of lean concrete applied to a complex geological environment, which adopts the following technical scheme:
a preparation process of lean concrete applied to complex geological environment comprises the following steps:
s1: uniformly mixing the broken stone, part of water, sand and inorganic fiber to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and uniformly mixing to obtain the cement-based anti-cracking agent.
By adopting the technical scheme, the broken stone, part of water, sand and inorganic fiber are uniformly mixed, so that the aggregate material can be well premixed to form a uniform intermediate material, then the rest raw materials are mixed with the intermediate material, so that the anti-cracking agent and the inorganic fiber can fully coat and bond solid particles in a network manner, the isotropy of the concrete is better, and the mechanical property is stable and uniform.
Preferably, in step S1, the crushed stone, part of water, sand and inorganic fiber are uniformly mixed to obtain an intermediate material, and the intermediate material is obtained by mixing 40-70S at a stirring speed of 500-.
By adopting the technical scheme, the density and the porosity of the concrete are improved by adopting a multi-stage stirring mode, and the uniformity of a gel system is better.
In summary, the present application has the following beneficial effects:
1. because this application adopts inorganic fiber, anti-cracking agent synergism, greatly reduced the probability of plastic shrinkage and deformation in the concrete, promoted the anti fracture performance of concrete, 28 d's rupture strength reaches 2.33Mpa, can adapt to comparatively complicated geological environment.
2. In the application, the composition ratio of the inorganic fiber and the anti-cracking agent is optimized and adjusted, so that the breaking strength of the concrete is improved to 2.73 MPa.
3. According to the application, the glycidyl methacrylate solution is adopted to soak inorganic fibers, the ceramsite is added, the mixing process of the concrete is further optimized, the cracking resistance of the concrete is further improved, and the breaking strength reaches 2.87 MPa.
Detailed Description
The present application will be described in further detail with reference to examples.
The lean concrete applied to the complex geological environment is mainly prepared from the following raw materials in parts by weight: 1300 portions of gravel, 800 portions of sand, 50 to 80 portions of fly ash, 5 to 10 portions of inorganic fiber, 180 portions of cement, 100 portions of water, 130 portions of water reducing agent, 3 to 5 portions of anti-cracking agent and 12 to 25 portions of anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
Preferably, the crushed stone is in 2.5-25mm continuous gradation.
Preferably, the fineness modulus of the sand is 2.1-2.6, and the mud content is less than 1.5%.
Preferably, the cement is ordinary portland cement, reference 4.25R.
Preferably, the fly ash is first grade fly ash, and the average mesh number is 325 meshes.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, the methylated melamine formaldehyde value is an isobutanol etherified melamine formaldehyde resin.
Preferably, the anti-cracking agent is composed of at least one of vinyltrimethoxysilane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15). Further preferably, when the anti-cracking agent is vinyl trimethoxy silane and perhydropolysilazane which are compounded together with the methylated melamine formaldehyde resin, the anti-cracking agent is composed of the mass sum of the vinyl trimethoxy silane and the perhydropolysilazane and the methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
Preferably, the rock wool fibres have an average length of 12-20 mm. Further preferably, the rock wool fibres have an average length of 15 mm.
Preferably, the basalt fibers have an average length of 10 mm.
Preferably, the alumina ceramic fibers have an average length of 20 mm.
Preferably, the ceramsite is shale ceramsite, and the particle size specification is 5-10 mm.
Preferably, the raw material also comprises (0.5-1.2) parts by weight of N, N-dimethylformamide.
The information on the main raw materials of the examples and comparative examples of the present application is shown in table 1.
TABLE 1 information on main raw materials of examples and comparative examples of the present application
| Raw materials | Specification and model | Source manufacturer |
| Fly ash | First stage | Hebei-China-based building materials science and technology Co Ltd |
| Vinyl trimethoxy silane | KH-171 | Nanjing Xuanyao New Material science and technology Limited |
| Perhydropolysilazanes | IOTA PHPS | Anhui Aiyota Silicone oil Co Ltd |
| Trimerization by methyl etherificationCyanamide formaldehyde resin | Number 5282-60 | Changzhou Spise materials science & technology Limited |
| Rock wool fibre | First stage | Shijiazhuang Mayue building materials Co Ltd |
Examples
Example 1
The lean concrete applied to the complex geological environment is prepared from the following raw materials in parts by weight: 1300kg of broken stone, 600kg of sand, 50kg of fly ash, 5kg of inorganic fiber, 140kg of cement, 100kg of water, 3kg of water reducing agent and 12kg of anti-cracking agent; the inorganic fiber consists of rock wool fiber and alumina ceramic fiber in a mass ratio of 2:0.5, and the anti-cracking agent consists of vinyl trimethoxy silane and methylated melamine formaldehyde resin in a mass ratio of 3.5: 12.
Wherein the crushed stone is 2.5-25mm continuous gradation. The fineness modulus of the sand is 2.1-2.6, and the mud content is less than 1.5%. The cement is ordinary portland cement, and is marked with 4.25R. The fly ash is first-grade fly ash, and the average mesh number is 325 meshes. The water reducing agent is a polycarboxylic acid water reducing agent. The methylated melamine formaldehyde value is isobutyl alcohol etherified melamine formaldehyde resin. The average length of the rock wool fibers is 15 mm. The average length of the alumina ceramic fibers was 20 mm.
The preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Examples 2 to 5
The lean concrete of examples 2-5, applied to complex geological environments, was made from the following raw materials: broken stone, sand, fly ash, inorganic fiber, cement, water, a water reducing agent and an anti-cracking agent; the inorganic fiber consists of rock wool fiber and alumina ceramic fiber in a mass ratio of 2:0.5, and the anti-cracking agent consists of vinyl trimethoxy silane and methylated melamine formaldehyde resin in a mass ratio of 3.5: 12.
Wherein the crushed stone is 2.5-25mm continuous gradation. The fineness modulus of the sand is 2.1-2.6, and the mud content is less than 1.5%. The cement is ordinary portland cement, and is marked with 4.25R. The fly ash is first-grade fly ash, and the average mesh number is 325 meshes. The water reducing agent is a polycarboxylic acid water reducing agent. The methylated melamine formaldehyde value is isobutyl alcohol etherified melamine formaldehyde resin. The average length of the rock wool fibers is 15 mm. The average length of the alumina ceramic fibers was 20 mm.
The amounts of each raw material added to the lean concrete applied to the complex geological environment in examples 2 to 5 are shown in table 2.
Table 2 examples 2-5 amounts of raw materials added to lean concrete for use in complex geological environments
| Raw materials (kg) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Crushing stone | 1300 | 1600 | 1450 | 1400 | 1500 |
| Sand | 600 | 680 | 700 | 800 | 750 |
| Fly ash | 50 | 60 | 65 | 70 | 80 |
| Inorganic fiber | 5 | 10 | 7.2 | 6.5 | 8 |
| Cement | 140 | 180 | 165 | 155 | 170 |
| Water (W) | 100 | 120 | 115 | 110 | 130 |
| Water reducing agent | 3 | 4 | 3.8 | 3.5 | 5 |
| Anti-cracking agent | 12 | 15 | 18 | 22 | 25 |
The process of examples 2-5 for the preparation of lean concrete for use in complex geological environments, comprising the steps of:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Example 6
The lean concrete applied to the complex geological environment is prepared from the following raw materials in parts by weight: 1450kg of broken stone, 700kg of sand, 65kg of fly ash, 7.2kg of inorganic fiber, 165kg of cement, 115kg of water, 3.8kg of water reducing agent and 18kg of anti-cracking agent; the inorganic fiber consists of rock wool fiber and basalt fiber according to the mass ratio of 2:0.5, and the anti-cracking agent consists of vinyl trimethoxy silane and methylated melamine formaldehyde resin according to the mass ratio of 3.5: 12.
The preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Example 7
The lean concrete applied to the complex geological environment is prepared from the following raw materials in parts by weight: 1450kg of broken stone, 700kg of sand, 65kg of fly ash, 7.2kg of inorganic fiber, 165kg of cement, 115kg of water, 3.8kg of water reducing agent and 18kg of anti-cracking agent; the inorganic fiber consists of rock wool fiber and basalt fiber according to the mass ratio of 2:0.5, and the anti-cracking agent consists of perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of 3.5: 12.
The preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Example 8
The lean concrete applied to the complex geological environment is prepared from the following raw materials in parts by weight: 1450kg of broken stone, 700kg of sand, 65kg of fly ash, 7.2kg of inorganic fiber, 165kg of cement, 115kg of water, 3.8kg of water reducing agent and 18kg of anti-cracking agent; the inorganic fiber consists of rock wool fiber and basalt fiber according to the mass ratio of 2:0.5, and the anti-cracking agent consists of perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of 5: 13.5.
The preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Example 9
The lean concrete applied to the complex geological environment is prepared from the following raw materials in parts by weight: 1450kg of broken stone, 700kg of sand, 65kg of fly ash, 7.2kg of inorganic fiber, 165kg of cement, 115kg of water, 3.8kg of water reducing agent and 18kg of anti-cracking agent; the inorganic fiber consists of rock wool fiber and basalt fiber according to the mass ratio of 2:0.5, and the anti-cracking agent consists of perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of 7: 15.
The preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Example 10
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 8 in that: the anti-cracking agent consists of vinyl trimethoxy silane, perhydropolysilazane and methylated melamine formaldehyde resin in a mass ratio of 1:2.5:12, and the rest is the same as in example 8.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 8.
Example 11
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 8 in that: the anti-cracking agent consists of vinyl trimethoxy silane, perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of 2:3:13.5, and the rest is the same as the example 8.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 8.
Example 12
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 8 in that: the anti-cracking agent consists of vinyl trimethoxy silane, perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of 3:4:15, and the rest is the same as the example 8.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 8.
Example 13
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 12 in that: the inorganic fibers were composed of rock wool fibers, alumina ceramic fibers, and basalt fibers at a mass ratio of 5:0.8:2, and the rest was the same as in example 12.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 12.
Example 14
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 12 in that: the inorganic fibers were composed of rock wool fibers, alumina ceramic fibers, and basalt fibers at a mass ratio of 7:1.2:3.5, and the rest was the same as in example 12.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 12.
Example 15
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 12 in that: the inorganic fibers were composed of rock wool fibers, alumina ceramic fibers, and basalt fibers at a mass ratio of 10:1.5:5, and the rest was the same as in example 12.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 12.
Example 16
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 14 in that: the inorganic fibers were subjected to a dipping treatment with a glycidyl methacrylate solution, and the rest was the same as in example 14.
Wherein the mass fraction of the glycidyl methacrylate in the glycidyl methacrylate solution is 35 percent, and the soaking time is 60 min.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 14.
Example 17
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 16 in that: the raw materials also include 3kg of ceramsite, and the rest is the same as that in the example 16.
Wherein the ceramsite is shale ceramsite, and the particle size specification is 5-10 mm.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 16.
Example 18
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 16 in that: the raw materials also include 5kg of ceramsite, and the rest is the same as the example 16.
Wherein the ceramsite is shale ceramsite, and the particle size specification is 5-10 mm.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 16.
Example 19
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 16 in that: the raw materials also include 7kg of ceramsite, and the rest is the same as that of the example 16.
Wherein the ceramsite is shale ceramsite, and the particle size specification is 5-10 mm.
The preparation process of the lean concrete applied to the complex geological environment of the embodiment is the same as that of the embodiment 16.
Example 20
The poor concrete applied to the complex geological environment of the present embodiment is different from that of embodiment 18 in that:
the preparation process of the lean concrete applied to the complex geological environment comprises the following steps:
s1: mixing crushed stone, 70% of water, sand and inorganic fiber at a stirring speed of 600rpm for 60 seconds to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing at a stirring speed of 500rpm for 150 seconds to obtain the cement-based anti-cracking agent.
The composition of the raw material of the lean concrete applied to the complex geological environment of the present example is the same as that of example 18.
Comparative example
The lean concrete applied to the complex geological environment of the comparative example is prepared from the following raw materials in parts by weight: 1300kg of broken stone, 600kg of sand, 50kg of fly ash, 5kg of inorganic fiber, 140kg of cement, 100kg of water, 3kg of water reducing agent and 12kg of anti-cracking agent; the inorganic fiber is rock wool fiber, and the anti-cracking agent is styrene-butadiene emulsion.
Wherein the crushed stone is 2.5-25mm continuous gradation. The fineness modulus of the sand is 2.1-2.6, and the mud content is less than 1.5%. The cement is ordinary portland cement, and is marked with 4.25R. The fly ash is first-grade fly ash, and the average mesh number is 325 meshes. The water reducing agent is a polycarboxylic acid water reducing agent. The solid content of the butylbenzene emulsion is 60%. The average length of the rock wool fibers is 15 mm.
The preparation process of the lean concrete applied to the complex geological environment of the comparative example comprises the following steps:
s1: uniformly stirring the crushed stone, 70% of water, sand and inorganic fiber for 80 seconds at a stirring speed of 400rpm to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and mixing for 100 seconds at a stirring speed of 300 rpm.
Performance test
Detection method
The compressive strength and the flexural strength of the poor concrete applied to the complex geological environment in the examples 1 to 20 and the comparative example are tested for 28d according to GB/T50081-2016 Standard test method for mechanical Properties of general concrete, and the test results are shown in Table 3.
TABLE 3 results of Performance test of examples 1-20 and comparative examples
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A lean concrete applied to a complex geological environment is characterized in that: the material is mainly prepared from the following raw materials in parts by weight: 1300 portions of gravel, 800 portions of sand, 50 to 80 portions of fly ash, 5 to 10 portions of inorganic fiber, 180 portions of cement, 100 portions of water, 130 portions of water reducing agent, 3 to 5 portions of anti-cracking agent and 12 to 25 portions of anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
2. The lean concrete applied to the complex geological environment according to claim 1, wherein: the material is mainly prepared from the following raw materials in parts by weight: 1400-1500 parts of gravel, 750 parts of sand 680-750 parts of fly ash, 6.5-8 parts of inorganic fiber, 170 parts of cement, 120 parts of water, 3.5-4 parts of a water reducing agent and 15-22 parts of an anti-cracking agent; the inorganic fiber is at least two of rock wool fiber, alumina ceramic fiber and basalt fiber, and the anti-cracking agent is composed of at least one of vinyl trimethoxy silane and perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (3.5-7) to (12-15).
3. The lean concrete applied to the complex geological environment according to claim 1, wherein: the anti-cracking agent consists of vinyl trimethoxy silane, perhydropolysilazane and methylated melamine formaldehyde resin according to the mass ratio of (1-3) to (2.5-4) to (12-15).
4. The lean concrete applied to the complex geological environment according to claim 1, wherein: the mass ratio of the broken stone to the anti-cracking agent is (60-108): 1.
5. The lean concrete applied to the complex geological environment according to claim 1, wherein: the inorganic fiber consists of rock wool fiber, alumina ceramic fiber and basalt fiber in the mass ratio of (5-10) to (0.8-1.5) to (2-5).
6. The lean concrete applied to the complex geological environment according to claim 5, wherein: the inorganic fiber is soaked in glycidyl methacrylate solution.
7. The lean concrete applied to the complex geological environment according to claim 1, wherein: the raw materials also comprise (3-7) parts by weight of ceramsite.
8. A process for the preparation of lean concrete for use in complex geological environments, as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps:
s1: uniformly mixing the broken stone, part of water, sand and inorganic fiber to prepare an intermediate material;
s2: and adding the cement, the fly ash, the water reducing agent, the anti-cracking agent and the residual water into the intermediate material, and uniformly mixing to obtain the cement-based anti-cracking agent.
9. The process for preparing poor concrete for use in complex geological environments according to claim 8, wherein: in the step S1, the crushed stone, part of water, sand and inorganic fiber are uniformly mixed to obtain an intermediate material, and the intermediate material is obtained by mixing 40-70S at a stirring speed of 500-700rpm, and in the step S2, cement, fly ash, a water reducing agent, an anti-cracking agent and residual water are added into the intermediate material and uniformly mixed at a stirring speed of 350-600rpm for 120-180S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111124769.0A CN113816679A (en) | 2021-09-25 | 2021-09-25 | Lean concrete applied to complex geological environment and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111124769.0A CN113816679A (en) | 2021-09-25 | 2021-09-25 | Lean concrete applied to complex geological environment and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113816679A true CN113816679A (en) | 2021-12-21 |
Family
ID=78915428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111124769.0A Pending CN113816679A (en) | 2021-09-25 | 2021-09-25 | Lean concrete applied to complex geological environment and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113816679A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114315249A (en) * | 2021-12-30 | 2022-04-12 | 重庆交能建材有限责任公司 | Pervious concrete and preparation process thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015006650A (en) * | 2013-06-26 | 2015-01-15 | 須知 晃一 | Method of manufacturing composite bodies of system configuration structure cell and component material |
| CN105621990A (en) * | 2015-12-30 | 2016-06-01 | 福建江夏学院 | High-tenacity crack-resistant grouting cement mortar and preparing method thereof |
| CN106280240A (en) * | 2016-08-16 | 2017-01-04 | 苏州市云林电子有限公司 | A kind of enhancing modified melamine resin rubber |
| WO2018130913A2 (en) * | 2017-01-15 | 2018-07-19 | Butler Michael George | Apparatuses and systems for and methods of generating and placing zero-slump-pumpable concrete |
| CN108793895A (en) * | 2018-08-25 | 2018-11-13 | 北京建工新型建材有限责任公司 | A kind of concrete with high cracking resistance |
| CN109626863A (en) * | 2018-12-07 | 2019-04-16 | 武汉市浩盛特种建材有限责任公司 | A kind of corrosion resistant concrete additive of toughening |
| CN110922092A (en) * | 2019-12-14 | 2020-03-27 | 淮北旭日建材有限公司 | Polymer cement concrete additive and preparation method thereof |
| CN111793319A (en) * | 2020-08-12 | 2020-10-20 | 汕头市邦腾科技有限公司 | High-toughness modified plastic and preparation method and application thereof |
| CN111892357A (en) * | 2020-08-14 | 2020-11-06 | 中国路桥工程有限责任公司 | White self-cleaning concrete and preparation method thereof |
| CN112408837A (en) * | 2020-11-23 | 2021-02-26 | 保利长大工程有限公司 | Composite mineral admixture based on granite powder and preparation method thereof |
| CN113402232A (en) * | 2021-07-22 | 2021-09-17 | 成都典弥霖建筑科技有限公司 | Cement-based composite slurry for 3D printing and preparation method thereof |
-
2021
- 2021-09-25 CN CN202111124769.0A patent/CN113816679A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015006650A (en) * | 2013-06-26 | 2015-01-15 | 須知 晃一 | Method of manufacturing composite bodies of system configuration structure cell and component material |
| CN105621990A (en) * | 2015-12-30 | 2016-06-01 | 福建江夏学院 | High-tenacity crack-resistant grouting cement mortar and preparing method thereof |
| CN106280240A (en) * | 2016-08-16 | 2017-01-04 | 苏州市云林电子有限公司 | A kind of enhancing modified melamine resin rubber |
| WO2018130913A2 (en) * | 2017-01-15 | 2018-07-19 | Butler Michael George | Apparatuses and systems for and methods of generating and placing zero-slump-pumpable concrete |
| CN108793895A (en) * | 2018-08-25 | 2018-11-13 | 北京建工新型建材有限责任公司 | A kind of concrete with high cracking resistance |
| CN109626863A (en) * | 2018-12-07 | 2019-04-16 | 武汉市浩盛特种建材有限责任公司 | A kind of corrosion resistant concrete additive of toughening |
| CN110922092A (en) * | 2019-12-14 | 2020-03-27 | 淮北旭日建材有限公司 | Polymer cement concrete additive and preparation method thereof |
| CN111793319A (en) * | 2020-08-12 | 2020-10-20 | 汕头市邦腾科技有限公司 | High-toughness modified plastic and preparation method and application thereof |
| CN111892357A (en) * | 2020-08-14 | 2020-11-06 | 中国路桥工程有限责任公司 | White self-cleaning concrete and preparation method thereof |
| CN112408837A (en) * | 2020-11-23 | 2021-02-26 | 保利长大工程有限公司 | Composite mineral admixture based on granite powder and preparation method thereof |
| CN113402232A (en) * | 2021-07-22 | 2021-09-17 | 成都典弥霖建筑科技有限公司 | Cement-based composite slurry for 3D printing and preparation method thereof |
Non-Patent Citations (5)
| Title |
|---|
| 刘朝晖等: "玄武岩纤维贫混凝土力学性能研究", 《华北水利水电学院学报》 * |
| 徐江萍等: "贫混凝土基层材料强度与龄期关系", 《长安大学学报(自然科学版)》 * |
| 李晓霞: "贫混凝土基层材料强度特性的研究", 《黑龙江科技信息》 * |
| 李超等: "短切玄武岩纤维对贫混凝土工作性能影响研究", 《湖南交通科技》 * |
| 欧阳昇: "玄武岩纤维贫混凝土基层力学性能对比试验研究", 《黑龙江交通科技》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114315249A (en) * | 2021-12-30 | 2022-04-12 | 重庆交能建材有限责任公司 | Pervious concrete and preparation process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113955990B (en) | Semi-flexible concrete and preparation method thereof | |
| CN110256023B (en) | Anti-freezing, anti-permeability and anti-cracking concrete and preparation method thereof | |
| Wang et al. | Improving performance of recycled aggregate concrete with superfine pozzolanic powders | |
| CN105541209A (en) | Basalt fiber reinforced cement based material and preparation method therefor | |
| CN109809775A (en) | A kind of self-compaction self-waterproof concrete | |
| CN112500042A (en) | Elastic-toughness well cementation cement slurry suitable for coal bed gas and preparation method thereof | |
| CN112266218A (en) | High-strength concrete and preparation method thereof | |
| CN112679162B (en) | A kind of self-compacting concrete with low shrinkage and ultra-high strength and preparation method thereof | |
| CN112079605A (en) | Concrete for inhibiting concrete cracks and preparation method thereof | |
| CN114230289A (en) | Green high-strength and high-toughness concrete and preparation process thereof | |
| CN110282935A (en) | A kind of fiber reinforcement type concrete and preparation method thereof | |
| CN113402225B (en) | Anti-crack concrete and preparation method thereof | |
| CN113213854B (en) | Fair-faced concrete produced from construction waste recycled aggregate and preparation method thereof | |
| CN114014584B (en) | Reinforcing agent for high-strength impact-resistant and wear-resistant pervious concrete, and preparation method and application thereof | |
| CN118930196B (en) | A self-compacting high crack resistance desert sand fiber concrete material and preparation method thereof | |
| Chindaprasirt et al. | Reuse of recycled aggregate in the production of alkali-activated concrete | |
| CN113979680A (en) | High polymer environment-friendly recycled concrete and preparation method thereof | |
| CN113816679A (en) | Lean concrete applied to complex geological environment and preparation process thereof | |
| CN110937868A (en) | Self-compacting hybrid fiber concrete and preparation method thereof | |
| CN116040996A (en) | Bare concrete and construction process thereof | |
| CN113698154A (en) | High-crack-resistance concrete for building and manufacturing method thereof | |
| CN112624674A (en) | High-strength recycled concrete and preparation method thereof | |
| He et al. | Early-age properties development of recycled glass powder blended cement paste: strengths, shrinkage, nanoscale characteristics, and environmental analysis | |
| CN113135713A (en) | High-strength recycled concrete and preparation method thereof | |
| CN119330643A (en) | Gray sand polymer material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211221 |