CN114014570A - Asphalt concrete filler, asphalt concrete and preparation method thereof - Google Patents
Asphalt concrete filler, asphalt concrete and preparation method thereof Download PDFInfo
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- CN114014570A CN114014570A CN202210008624.2A CN202210008624A CN114014570A CN 114014570 A CN114014570 A CN 114014570A CN 202210008624 A CN202210008624 A CN 202210008624A CN 114014570 A CN114014570 A CN 114014570A
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- asphalt concrete
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- asphalt
- cobalt powder
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 127
- 239000000945 filler Substances 0.000 title claims abstract description 82
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000000843 powder Substances 0.000 claims abstract description 45
- 239000010426 asphalt Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 23
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000006028 limestone Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 18
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 5
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 5
- 239000008117 stearic acid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000002715 modification method Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 38
- 239000000463 material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 20
- 230000000694 effects Effects 0.000 description 10
- 238000006703 hydration reaction Methods 0.000 description 10
- 230000002035 prolonged effect Effects 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012764 mineral filler Substances 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 125000003396 thiol group Chemical group [H]S* 0.000 description 2
- 239000004278 EU approved seasoning Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 235000011194 food seasoning agent Nutrition 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/34—Metals, e.g. ferro-silicon
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The application relates to the technical field of engineering materials, and particularly discloses an asphalt concrete filler, asphalt concrete and a preparation method thereof. The asphalt concrete filler comprises the following raw materials in parts by weight: 14-35 parts of limestone powder, 16-39 parts of steel slag powder, 5-30 parts of cobalt powder and 0.2-0.9 part of dispersant; the asphalt concrete is prepared from the filler, and the preparation method comprises the following steps: the asphalt concrete is obtained by drying coarse aggregate and fine aggregate, adding the filler for multiple times, uniformly mixing, adding into asphalt and stirring. The asphalt concrete filler can be used in the production of asphalt concrete, and has the advantages of improving the water damage resistance of the asphalt concrete and prolonging the service life of the asphalt concrete.
Description
Technical Field
The application relates to the technical field of engineering materials, in particular to an asphalt concrete filler, asphalt concrete and a preparation method thereof.
Background
The asphalt concrete is a commonly used material for paving roads, and is used for more asphalt concrete pavements in the road construction of China, and the asphalt concrete pavements belong to soft pavements, so that the asphalt concrete pavement has the advantages of comfortable driving and low noise.
At present, the related asphalt concrete is a mixture prepared by mixing asphalt materials, coarse aggregates, fine aggregates and fillers in a specific proportion, and although the proportion of the fillers in the asphalt concrete is not large, the fillers have important influence on the performance of an asphalt concrete pavement.
In view of the above-mentioned related technologies, the inventor believes that the service life of the asphalt concrete pavement is reduced because the bonding force is reduced after the asphalt contacts with water, and the asphalt concrete pavement is loosened, pits and the like under the condition of the existence of moisture and after repeated action of vehicle load.
Disclosure of Invention
In order to improve the water damage resistance of the asphalt concrete pavement and prolong the service life of the asphalt concrete pavement, the application provides the asphalt concrete filler, the asphalt concrete and the preparation method thereof.
In a first aspect, the present application provides an asphalt concrete filler, which adopts the following technical scheme:
an asphalt concrete filler comprises the following raw materials in parts by weight:
14-35 parts of limestone powder;
16-39 parts of steel slag powder;
5-30 parts of cobalt powder;
0.2-0.9 part of dispersant.
By adopting the technical scheme, when water enters the asphalt concrete pavement, the asphalt is softened under the action of the water, so that the bonding force between the asphalt and the aggregate is reduced, and the asphalt concrete pavement is loosened under the repeated action of vehicle load. In order to enhance the water damage resistance of the asphalt concrete, the cobalt powder is added into the filler, is insoluble in water and has good hardness and tensile strength, the cobalt powder serving as the filler can improve the wear resistance of the asphalt concrete pavement, and meanwhile, when the pavement bears the load of a vehicle, the filler added with the cobalt powder can better bear the pressure, improve the tensile strength of the asphalt concrete pavement and reduce the rutting crack of the asphalt concrete pavement caused by the load pressure of the vehicle;
on one hand, the steel slag powder has rough surface textures which are expressed as obvious edges and holes, so that the steel slag powder can adsorb more asphalt, the contact area of the steel slag powder and the asphalt is increased, and the adhesion effect is stronger; on the other hand, because the steel slag powder contains residual iron in the steel making process, and the cobalt powder is a ferromagnetic metal, the cobalt powder and the steel slag powder can be mutually adsorbed, so that the binding power between the cobalt powder and the steel slag powder is improved, and the moisture entering into the asphalt concrete is reduced;
limestone powder is used as a common mineral filler, and the filler prepared by mixing the limestone powder and steel slag powder according to a specific proportion is applied to the asphalt concrete pavement, so that the compressive strength of the pavement can be effectively improved;
the addition of the dispersing agent can effectively improve the dispersibility of the limestone powder, the steel slag powder and the cobalt powder, reduce agglomeration, enable the prepared filler to better improve the adhesion between asphalt and aggregate, improve the water damage resistance of asphalt concrete and prolong the service life of the asphalt concrete.
Preferably, the filler comprises the following raw materials in parts by weight:
18-25 parts of limestone powder;
20-28 parts of steel slag powder;
7-13 parts of cobalt powder;
0.3-0.6 part of dispersant.
By adopting the technical scheme, the proportion of the filler is optimized, so that the filler can better act on the asphalt concrete mixture to fill the pores, the cohesiveness between asphalt and aggregate is improved, the condition that water permeates into the asphalt concrete pavement is reduced, and the service life of the asphalt concrete pavement is prolonged.
Preferably, the average particle size of the cobalt powder is between 1 and 3 μm.
By adopting the technical scheme, when the particle size of the cobalt powder is too small, the surface area is increased, and the oxidation is more likely to occur, so that the use of the cobalt powder is influenced; when the particle size of the cobalt powder is too large, the cobalt powder is unevenly distributed in the asphalt concrete, so that the use effect of the cobalt powder is poor; when the cobalt powder with the average grain diameter of 1-3 mu m is added, the tensile strength and the water damage resistance of the asphalt concrete can be better improved.
Preferably, the cobalt powder is modified cobalt powder wrapped with dodecyl mercaptan, and the modification method comprises the following steps:
and (2) putting dodecyl mercaptan into a solvent, performing ultrasonic dispersion, stirring for 0.1-1h, then adding cobalt powder, performing further ultrasonic dispersion, stirring for reaction for 2-4h, centrifuging, washing, and performing vacuum drying for 30-60min to obtain modified cobalt powder.
By adopting the technical scheme, the filler contains alkaline raw materials, so that certain corrosion is easily caused to the cobalt powder, and the using effect of the cobalt powder is influenced; the dodecyl mercaptan is used as a nonionic surfactant, is high in stability and not easy to hydrolyze, after the cobalt powder is modified by the dodecyl mercaptan, the acid and alkali resistance of the cobalt powder is improved, meanwhile, the mercapto group in the mercaptan can react with the cobalt powder, so that nonpolar group cobalt mercaptide is formed on the surface of the cobalt powder, the dispersibility of the cobalt powder is improved, the adhesiveness between asphalt and aggregate can be better improved, moisture is reduced to enter the asphalt concrete, and the service life of the asphalt concrete is prolonged.
Preferably, the modified cobalt powder is prepared from the following components in a mass ratio of 1: and (1-3) dodecyl mercaptan and cobalt powder.
By adopting the technical scheme, the cobalt powder is coated by the dodecanethiol to obtain the modified cobalt powder, and when the feeding amount is within the range, the product performance of the modified cobalt powder is not affected.
Preferably, the raw materials of the asphalt concrete filler also comprise 18-25 parts of cement.
By adopting the technical scheme, after water enters the asphalt concrete, on one hand, part of the cement filler on the surface layer of the pavement is subjected to hydration reaction with the water, and the aqueous solution of the hydration reaction is alkaline, so that the aqueous solution of the hydration reaction is subjected to chemical reaction with acidic asphalt, and the adhesion between the asphalt and the aggregate is enhanced; on the other hand, the insoluble products generated by the hydration of the cement can fill the pores, so that the asphalt concrete is more compact; the limestone powder has higher hydration activity, and the limestone powder and the cement can react with each other to generate calcium aluminate hydrate which is in lap joint with the cobalt powder, so that the internal structure of the asphalt concrete is improved, the water damage resistance is improved, and the service life of the asphalt concrete is prolonged.
Preferably, the dispersant is stearic acid.
By adopting the technical scheme, the cobalt powder has the defect of poor dispersibility, the uniformity of mixing the limestone powder, the steel slag powder and the cobalt powder is improved after the dispersing agent is added, and the cobalt powder coated with the dodecanethiol has good compatibility with the stearic acid, so that the dispersing effect can be better realized, the filler can better fill the gap between the asphalt and the aggregate, the water damage resistance is improved, and the service life of the asphalt concrete pavement is prolonged.
In a second aspect, the present application provides an asphalt concrete, which adopts the following technical scheme:
the asphalt concrete comprises the following raw materials in parts by weight:
5-10 parts of a filler;
8-15 parts of asphalt;
35-45 parts of coarse aggregate, and the particle size is 4.8-5.6 mm;
15-25 parts of fine aggregate with the particle size of 1.5-3 mm;
the filler is the asphalt concrete filler.
By adopting the technical scheme, the asphalt concrete pavement prepared by mixing the coarse aggregate, the fine aggregate, the filler and the asphalt has good water damage resistance, the addition of the filler can effectively improve the adhesion among the asphalt, the coarse aggregate and the fine aggregate, reduce the water entering the asphalt concrete, better resist the acting force of vehicle load and prolong the service life of the asphalt concrete pavement.
In a third aspect, the present application provides a method for preparing asphalt concrete, which adopts the following technical scheme:
the preparation method of the asphalt concrete comprises the following steps:
s1: stirring and drying the coarse aggregate and the fine aggregate, controlling the drying temperature at 110-120 ℃, and the drying time at 1-1.5h to obtain a mixture A;
s2: adding the asphalt concrete filler into the mixture A for multiple times, and stirring and mixing to obtain a mixture B;
s3: heating the asphalt to 130-180 ℃, continuously stirring, adding the mixture B into the asphalt, stirring for 30-60min, and uniformly mixing to obtain the asphalt concrete.
By adopting the technical scheme, the filler is added into the coarse aggregate and the fine aggregate for multiple times for stirring, so that the filler can be better wrapped on the outer sides of the coarse aggregate and the fine aggregate, and the coarse aggregate, the fine aggregate and the filler are reacted after being contacted with the asphalt, so that the filler can fill the pores between the aggregates, the adhesion between the asphalt and the aggregates is improved, the water damage resistance of the asphalt concrete is improved, and the service life of the asphalt concrete is prolonged.
In summary, the present application has the following beneficial effects:
1. because the cobalt powder is added into the filler, the cobalt powder is insoluble in water and has good hardness and tensile strength, the cobalt powder used as the filler can improve the wear resistance of the asphalt concrete pavement, and meanwhile, when the pavement bears the load of a vehicle, the filler added with the cobalt powder can better bear the pressure and improve the tensile strength of the asphalt concrete pavement; because the steel slag powder contains residual iron in the steel making process, and the cobalt powder is a metal with ferromagnetism, the cobalt powder and the steel slag powder can be mutually adsorbed, so that the binding power between the cobalt powder and the steel slag powder is improved, and the moisture entering the asphalt concrete is reduced.
2. The modified cobalt powder that the outside parcel has dodecanethiol is preferably adopted in this application, because contain alkaline raw materials in the filler, cause certain erosion to the cobalt powder easily, influence its result of use, dodecanethiol is as a nonionic surfactant, stability is higher, difficult hydrolysis, dodecanethiol carries out the back of modifying to the cobalt powder, the acid and alkali resistance of cobalt powder has been promoted, mercapto group in the mercaptan can take place the reaction with the cobalt powder simultaneously, make the cobalt powder surface form nonpolar group cobalt mercaptide, improve the dispersibility of cobalt powder, make its promotion that can be better adhesion between pitch and the aggregate, it is inside to reduce moisture entering asphalt concrete, the life of extension asphalt concrete.
3. According to the method, the coarse aggregate and the fine aggregate are dried firstly, the filler is added for multiple times and is added into the asphalt after being mixed uniformly, the asphalt concrete is obtained, the filler can fill the pores between the aggregates, the adhesion between the asphalt and the aggregates is improved, the water damage resistance of the asphalt concrete is improved, and the service life of the asphalt concrete is prolonged.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw material sources are as follows:
examples
Example 1
The following description will be given by taking example 1 as an example.
The asphalt concrete filler is prepared by mixing the following raw materials in parts by weight:
20kg of limestone powder;
22kg of steel slag powder;
10kg of cobalt powder, wherein the average particle size of the cobalt powder is 2 mu m;
0.5kg of dispersing agent;
wherein, the cobalt powder is modified cobalt powder wrapped with dodecyl mercaptan, and the modification method comprises the following steps:
putting 10kg of dodecanethiol into 25kg of absolute ethanol, performing ultrasonic dispersion, stirring for 0.5h, then adding 20kg of unmodified cobalt powder, further performing ultrasonic dispersion, stirring for reaction for 3h, centrifuging, washing, and performing vacuum drying for 50min to obtain modified cobalt powder;
the dispersant is stearic acid.
As shown in Table 1, examples 1 to 5 differ mainly in the ratio of raw materials.
TABLE 1 raw material ratios of examples 1-5
Example 6
An asphalt concrete filler based on example 1, except that the cobalt powder had an average particle size of 1 μm.
Example 7
An asphalt concrete filler based on example 1, except that the cobalt powder had an average particle size of 3 μm.
Example 8
The difference between this example and example 1 is that 20kg of cement was also added to the filler, and the cement was added to mix a in S2 together with other fillers, and mixed with stirring to obtain mix B.
Example 9
This example is different from example 8 in that the amount of cement added was 18 kg.
Example 10
This example is different from example 8 in that the amount of cement added was 25 kg.
Application example
Application example 1
The asphalt concrete comprises the following raw materials in parts by weight:
the amount of the filler was 8kg,
12kg of asphalt is mixed with the following materials,
40kg of coarse aggregate having an average particle diameter of 6mm,
20kg of fine aggregate having an average particle diameter of 2 mm.
Wherein the asphalt is petroleum asphalt, the coarse aggregate is gravel, and the fine aggregate is river sand;
the asphalt concrete filler was from example 1.
The preparation method of the asphalt concrete comprises the following steps:
s1: stirring and drying the coarse aggregate and the fine aggregate, controlling the drying temperature at 115 ℃ for 1.2h, and obtaining a mixture A;
s2: adding the filler into the mixture A for three times, and stirring and mixing to obtain a mixture B;
s3: and heating the asphalt to 150 ℃, continuously stirring, adding the mixture B into the asphalt, stirring for 50min, and uniformly mixing to obtain the asphalt concrete.
Application examples 2 to 10
An asphalt concrete which differs from application example 1 in that an asphalt concrete filler was prepared in the order of examples 2 to 10.
Comparative example
Comparative example 1
An asphalt concrete, which is different from application example 1 in that the amount of cobalt powder in the asphalt concrete filler is 0 kg.
Comparative example 2
An asphalt concrete which is different from application example 1 in that the average particle size of cobalt powder in the asphalt concrete filler is 10 μm.
Comparative example 3
An asphalt concrete which is different from application example 1 in that the average particle size of cobalt powder in the asphalt concrete filler is 0.3 μm.
Comparative example 4
The asphalt concrete is different from the application example 1 in that the cobalt powder in the asphalt concrete filler is ordinary cobalt powder which is not modified by dodecyl mercaptan.
Comparative example 5
The comparative example differs from application example 1 in that the amount of the dispersant used was 0 kg.
Comparative example 6
An asphalt concrete is different from the application example 8 in that the asphalt concrete filler in the S2 is added into the mixture in one step, and the mixture B is obtained by stirring and mixing.
Performance detection test method
Performance tests were performed on the asphalt concrete pavements of examples 1-10 and comparative examples 1-6 according to JTGF40-2004 technical Specification for construction of Highway asphalt pavements.
Note: water stability data is used to characterize water damage resistance; the high temperature stability data was used to characterize rut test stability and tensile strength.
The results are shown in Table 2.
TABLE 2 results of testing asphalt concrete according to application examples 1 to 10 and comparative examples 1 to 5
The combination of application examples 1-5 and comparative example 1 and the combination of Table 2 shows that the anti-rutting stability and the water damage resistance of the application examples 1-5 are superior to those of the comparative example 1, which indicates that the cobalt powder is added into the filler in the application, the cobalt powder is insoluble in water and has good hardness and tensile strength, the cobalt powder is used as the filler to improve the wear resistance of the asphalt concrete pavement, and meanwhile, when the pavement bears the load of a vehicle, the filler added with the cobalt powder can better bear the pressure, improve the tensile strength of the asphalt concrete pavement and reduce the rutting cracks of the asphalt concrete pavement caused by the load pressure of the vehicle; on one hand, the steel slag powder has rough surface textures which are expressed as obvious edges and holes, so that the steel slag powder can adsorb more asphalt, the contact area of the steel slag powder and the asphalt is increased, and the adhesion effect is stronger; on the other hand, because the steel slag powder contains residual iron in the steel making process, and the cobalt powder is a ferromagnetic metal, the cobalt powder and the steel slag powder can be mutually adsorbed, so that the binding power between the cobalt powder and the steel slag powder is improved, and the moisture entering into the asphalt concrete is reduced.
Limestone powder is used as a common mineral filler, and the filler prepared by mixing the limestone powder and steel slag powder according to a specific proportion is applied to the asphalt concrete pavement, so that the compressive strength of the pavement can be effectively improved,
the addition of the dispersing agent can effectively improve the dispersibility of the limestone powder, the steel slag powder and the cobalt powder, reduce agglomeration, enable the prepared filler to better improve the adhesion between asphalt and aggregate, improve the water damage resistance of asphalt concrete and prolong the service life of the asphalt concrete.
In application examples 1-5, the rut stability and water damage resistance of application example 1 are higher than those of other examples, so that the filler can better act on the asphalt concrete mixture, fill the pores, improve the bonding property between asphalt and aggregate, reduce the water permeation condition in the asphalt concrete pavement and prolong the service life of the asphalt concrete pavement in the application examples 1-5 according to the proportion of application example 1.
By combining application example 1 and application examples 6-7 and combining table 2, it can be seen that the anti-rutting stability and the water damage resistance of application example 1 are superior to those of application examples 6-7, which indicates that when the particle size of cobalt powder is too small, the surface area is increased, and oxidation is more likely to occur, so that the use of cobalt powder is affected; when the particle size of the cobalt powder is too large, the cobalt powder is unevenly distributed in the asphalt concrete, so that the use effect of the cobalt powder is poor;
it can be seen from the combination of application examples 1, 6 to 7, comparative examples 2 to 3 and Table 2 that the anti-rutting stability and the water damage resistance of application examples 6 to 7 are superior to those of comparative examples 2 to 3, which shows that when cobalt powder with an average particle size of 1 to 3 μm is added, the tensile strength and the water damage resistance of asphalt concrete can be improved better.
The application example 1 and the comparative example 4 are combined, and a table 2 shows that the water damage resistance of the application example 1 is superior to that of the comparative example 4, so that the filler in the application has certain corrosion to the cobalt powder easily due to the alkali-containing raw material, and the using effect of the cobalt powder is influenced.
It can be seen from combination of application example 1 and application examples 8-10 and combination of table 2 that the anti-rutting stability and the water damage resistance of application examples 8-10 are superior to application example 1, which indicates that after cement is added to the filler in the application to prepare asphalt concrete, after water enters the interior of the asphalt concrete, on one hand, part of the cement filler on the surface layer of the pavement is subjected to hydration reaction with water, and the aqueous solution of the hydration reaction is alkaline, so that the aqueous solution of the hydration reaction is subjected to chemical reaction with acidic asphalt, and the adhesion between the asphalt and the aggregate is enhanced; on the other hand, the insoluble products generated by the hydration of the cement can fill the pores, so that the asphalt concrete is more compact; the limestone powder has higher hydration activity, and the limestone powder and the cement can react with each other to generate calcium aluminate hydrate which is in lap joint with the cobalt powder, so that the internal structure of the asphalt concrete is improved, the water damage resistance is improved, and the service life of the asphalt concrete is prolonged.
It can be seen by combining application example 1 and comparative example 5 and combining table 2 that the water damage resistance of application example 1 is superior to that of comparative example 5, which illustrates that the cobalt powder in the application has a disadvantage of poor dispersibility, after the dispersant is added, the mixing uniformity of the limestone powder, the steel slag powder and the cobalt powder is improved, and the cobalt powder wrapped with dodecanethiol has good compatibility with stearic acid, so that the dispersion effect can be better realized, the filler can better fill the gap between asphalt and aggregate, the water damage resistance is improved, and the service life of the asphalt concrete pavement is prolonged.
It can be seen by combining application example 8 and comparative example 6 and combining table 2 that the water damage resistance of application example 8 is superior to that of comparative example 6, which shows that in the application, the filler is added into the coarse aggregate and the fine aggregate for multiple times for stirring, so that the filler can be better wrapped on the outer sides of the coarse aggregate and the fine aggregate, and the coarse aggregate, the fine aggregate and the filler react with the asphalt after contacting, so that the seasonings can fill up the pores between the aggregates, improve the adhesion between the asphalt and the aggregates, improve the water damage resistance of the asphalt concrete, and prolong the service life of the asphalt concrete.
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. The asphalt concrete filler is characterized by comprising the following raw materials in parts by weight:
14-35 parts of limestone powder;
16-39 parts of steel slag powder;
5-30 parts of cobalt powder;
0.2-0.9 part of dispersant.
2. The asphalt concrete filler according to claim 1, wherein the filler comprises the following raw materials in parts by weight:
18-25 parts of limestone powder;
20-28 parts of steel slag powder;
7-13 parts of cobalt powder;
0.3-0.6 part of dispersant.
3. An asphalt concrete filler according to claim 2, wherein: the average particle size of the cobalt powder is 1-3 mu m.
4. An asphalt concrete filler according to claim 3, wherein: the cobalt powder is modified cobalt powder wrapped with dodecyl mercaptan, and the modification method comprises the following steps:
and (2) putting dodecyl mercaptan into a solvent, performing ultrasonic dispersion, stirring for 0.1-1h, then adding cobalt powder, performing further ultrasonic dispersion, stirring for reaction for 2-4h, centrifuging, washing, and performing vacuum drying for 30-60min to obtain modified cobalt powder.
5. An asphalt concrete filler according to claim 4, wherein: the modified cobalt powder comprises the following components in percentage by mass of 1: and (1-3) dodecyl mercaptan and cobalt powder.
6. An asphalt concrete filler according to claim 1, wherein: the raw materials of the asphalt concrete filler also comprise 18-25 parts of cement.
7. An asphalt concrete filler according to claim 1, wherein: the dispersant is stearic acid.
8. The asphalt concrete is characterized by comprising the following raw materials in parts by weight:
5-10 parts of a filler;
8-15 parts of asphalt;
35-45 parts of coarse aggregate, and the particle size is 4.8-5.6 mm;
15-25 parts of fine aggregate with the particle size of 1.5-3 mm;
the filler is an asphalt concrete filler according to any one of claims 1 to 7.
9. The preparation method of the asphalt concrete based on claim 8 is characterized by comprising the following steps:
s1: stirring and drying the coarse aggregate and the fine aggregate, controlling the drying temperature at 110-120 ℃, and the drying time at 1-1.5h to obtain a mixture A;
s2: adding the asphalt concrete filler into the mixture A for multiple times, and stirring and mixing to obtain a mixture B;
s3: heating the asphalt to 130-180 ℃, continuously stirring, adding the mixture B into the asphalt, stirring for 30-60min, and uniformly mixing to obtain the asphalt concrete.
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| CN116332569A (en) * | 2023-04-13 | 2023-06-27 | 武汉理工大学 | Asphalt concrete with water damage resistance |
| CN118388969A (en) * | 2024-06-19 | 2024-07-26 | 中国电建集团西北勘测设计研究院有限公司 | Asphalt concrete penetration test specimen sealing material and preparation method thereof |
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| CN118388969A (en) * | 2024-06-19 | 2024-07-26 | 中国电建集团西北勘测设计研究院有限公司 | Asphalt concrete penetration test specimen sealing material and preparation method thereof |
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| CN114014570B (en) | 2022-04-26 |
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