CN111825370A - Concrete slump-retaining anti-cracking material for ballastless track base and preparation method thereof - Google Patents
Concrete slump-retaining anti-cracking material for ballastless track base and preparation method thereof Download PDFInfo
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- CN111825370A CN111825370A CN202010670294.4A CN202010670294A CN111825370A CN 111825370 A CN111825370 A CN 111825370A CN 202010670294 A CN202010670294 A CN 202010670294A CN 111825370 A CN111825370 A CN 111825370A
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- 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
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Abstract
The invention belongs to the technical field of building materials, and particularly relates to a ballastless track base concrete slump loss resistant and crack resistant material and a preparation method thereof. The slump-retaining anti-cracking material is prepared by mixing a shrinkage-reducing and slump-retaining high polymer component, a retarding component, a hydration temperature rise inhibiting component, a composite anti-cracking component, a water storage component and a reinforcing and toughening component according to a certain proportion, wherein the weight ratio of the components is (1.0-4.5 parts): the retarding component (0.5-1.5 parts): hydration temperature rise inhibition component (1-10 parts): the composite anti-cracking component (66-95 parts): water storage component (0.5-10 parts): and (2-8) a reinforcing and toughening component. The slump-retaining and anti-cracking material for the ballastless track base concrete is doped into the concrete according to a proper mixing amount, so that no slump loss of the concrete can be realized within 3 hours, the adiabatic temperature rise of the concrete is reduced by over 20 percent, the shrinkage variation of the concrete in a plasticity stage and a hardening stage is obviously reduced, the maximum crack reduction coefficient of the concrete can reach 92 percent, and the anti-cracking performance grade reaches 'first grade'.
Description
Technical Field
The invention belongs to the technical field of building materials. In particular to a concrete slump loss resistant and crack resistant material for a ballastless track base and a preparation method thereof.
Background
In recent years, the CRTS III slab ballastless track structure with independent intellectual property rights in China can be applied to a high-speed railway in a large scale, and the base concrete is used as the structural part of the lowest layer in the CRTS III slab ballastless track structure, so that the safety and the durability of the ballastless track structure are directly influenced by the performance of the base concrete. When the environment of the ballastless track is severe, the cracking risk of the base concrete is obviously increased. The reason is that temperature and humidity inside and on the surface of the concrete are different from the environment, so that temperature stress and drying shrinkage stress are generated inside and on the surface of the concrete, when the two stresses exceed the ultimate tensile strength of the concrete, cracks are generated in the concrete, and the concrete structure finally cracks along with the development of the cracks.
From the material point of view, the following measures are usually taken to improve the crack resistance of concrete: (1) adding an expanding agent, a shrinkage reducing agent or a cross-linking type water-absorbing resin to reduce the shrinkage of concrete; (2) incorporating organic synthetic, inorganic or metal fibers to reduce or inhibit crack generation; (3) the mineral admixture is added in the concrete proportioning to replace part of cement so as to reduce the hydration temperature rise of the concrete. Chinese patent document CN 106365486A proposes that a concrete compaction anti-cracking agent is prepared by light-burned magnesium oxide, calcium oxide-calcium sulphoaluminate double-expansion-source expansion clinker and gypsum, and can effectively inhibit the later-period shrinkage of concrete; however, the concrete is easy to lose water in the plastic stage, and the strength of the concrete in the plastic stage is low, so that the concrete cannot be prevented from cracking in the plastic stage due to water loss only by adding the expanding agent. Chinese patent document CN 105347724A proposes that plant starch, ionic monomer, nonionic monomer, cross-linking agent, initiator, tetraethoxysilane, alkali, deionized water and the like are taken as raw materials to prepare a concrete internal curing material, and the material is added to effectively prevent early cracking of concrete; however, the water absorption rate of the internal curing material in different concrete systems is unstable, so that the water absorption rate is too high in the early stage of hydration, the workability of fresh concrete is reduced, and the construction requirement cannot be met. Chinese patent document CN 109336504 a proposes a high-strength anti-cracking concrete, which is prepared by adding portland cement, zeolite powder, phosphorous slag powder, sand, rubber powder, stone, steel fiber, carbon fiber, polypropylene fiber, polyvinyl alcohol fiber, water reducing agent, air entraining agent, desulfurized gypsum and water into concrete. The high-strength anti-cracking concrete is prepared. Steel fibers, carbon fibers, polypropylene fibers and polyvinyl alcohol fiber materials are added into the concrete, so that the shrinkage of the concrete is effectively reduced through a complex three-dimensional random system, and cracks are prevented. However, too high a content of the additive not only reduces the working performance of fresh concrete, but also reduces the mechanical properties of hardened concrete. Chinese patent document CN 106830802A proposes that an anti-crack concrete is prepared by cement, river sand, gravel, water, a fiber mixture, lignin, an adhesive, an expanding agent and a filler, and the anti-crack capability of the concrete under the low-temperature condition is effectively improved through the interaction of the fiber mixture, the lignin, the adhesive and the expanding agent; however, apart from the drying shrinkage, the cracking of the concrete is also an important reason, and when the environment temperature of the concrete is low, the crack resistance of the concrete is significantly reduced due to the temperature stress generated by the hydration and temperature rise of the concrete.
Through researches (tests on the workability loss of concrete over time, hydration temperature rise, volume stability and crack resistance), the concrete slump-retaining crack-resistant concrete is found to be remarkably improved in the workability loss over time of fresh concrete, the hydration temperature rise, shrinkage and cracking area of the concrete are reduced and the concrete slump-retaining crack resistance is remarkably improved through the synergistic effect of the shrinkage-reduction type high polymer component, the slow-setting component, the hydration temperature rise inhibiting component, the composite crack-resistant component, the water storage component and the reinforcing and toughening component.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to prepare a concrete slump-retaining anti-cracking material, which solves the problem of great loss of concrete workability over time caused by adding a water storage material and solves the problems of increased hydration temperature of hardened concrete and great shrinkage in a plasticity stage and a hardening stage. The concrete slump-retaining and crack-resistant material for the ballastless track base provided by the invention has excellent slump-retaining and crack-resistant capabilities.
The invention provides a concrete slump loss resistant and crack resistant material for a ballastless track base, which is characterized by comprising the following components in parts by weight: the slump-retaining anti-cracking material is prepared by mixing a reduction-slump-retaining high polymer component, a retarding component, a hydration temperature rise inhibiting component, a composite anti-cracking component, a water storage component and a reinforcing and toughening component according to a certain proportion, wherein the weight ratio of the components is as follows:
reducing-slump retaining type high molecular component: 1.0-4.5 parts;
a retarding component: 0.5-1.5 parts;
hydration temperature rise inhibiting component: 1-10 parts;
composite anti-crack component: 66-95 parts;
a water storage component: 0.5-10 parts;
a reinforcing and toughening component: 2-8 parts;
the preparation method comprises the following steps:
the shrinkage-reduction-collapse-prevention high polymer component, the retarding component, the hydration temperature rise inhibiting component, the composite anti-cracking component, the water storage component and the reinforcing and toughening component are uniformly mixed according to the proportion range listed by the invention to prepare the product.
The shrinkage-reduction slump-retaining polymer component is a powder polymer material containing carboxyl and amido functional groups and one or two functional groups of ester groups and sulfonic groups, and the viscosity average molecular weight is 20000-80000. The functional group containing carboxyl is acrylic acid monomer, the functional group containing amido is one or two mixtures of 2-acrylamide-2-methylpropanesulfonic acid and 2-acrylamide-2-phenylethanesulfonic acid monomer, the functional group containing ester is one or more mixtures of hydroxyethyl acrylate, hydroxypropyl acrylate and vinyl acetate monomer, and the functional group containing sulfonic acid is one or more mixtures of sodium methallyl sulfonate, sodium p-styrene sulfonate monomer and disodium diphenylethylene disulfonate.
The retarding component is one or a mixture of more of sodium gluconate, sodium alginate and hyaluronic acid.
The hydration temperature rise inhibiting component is one or two of carbamide and ammonium chloride.
The composite anti-cracking component comprises an anti-cracking component in a concrete plasticity stage and an anti-cracking component in a concrete hardening stage, wherein the anti-cracking component in the concrete plasticity stage is one of aluminum powder, azodicarbonamide and difluorine, and accounts for 2-8% of the composite anti-cracking component; the crack-resistant component in the hardening stage of the concrete is ground magnesium oxide-calcium oxide double-expansion-source expansion clinker with the specific surface area of 250-350 m2And/kg, which accounts for 92-98% of the composite anti-cracking component.
The water storage component is one of methacrylic acid-acrylamide copolymerization crosslinking type high molecular materials and activated carbon. The particle size of the water storage component is 280-850 mu m.
The reinforcing and toughening component is one or two of graphene oxide and nano silicon dioxide.
The invention provides a concrete slump-retaining anti-cracking material for a ballastless track base and a preparation method thereof, and the concrete slump-retaining anti-cracking material has the following beneficial effects:
1. the shrinkage-reducing and slump-retaining polymer material is matched with the retarding component, and because the shrinkage-reducing and slump-retaining polymer material contains functional groups such as amide groups, ester groups and the like, the shrinkage-reducing and slump-retaining polymer material can react with a cement hydration product calcium hydroxide to slowly release carboxyl functional groups with a dispersing function; the high polymer material can obviously reduce the solid-liquid phase interfacial tension and capillary pressure in a cementing material system, so that the drying shrinkage and self-shrinkage of cement-concrete are reduced; in addition, the hydroxyl in the retarder can react with Ca in the slurry2+The complex slows down the hydration rate of the cement, and the unique molecular structure has certain water retention and moisture retention capacity on the concrete, can effectively lock free water in the concrete and prevent the free water from volatilizing at high temperature, and can obviously reduce the working loss of the concrete, particularly the concrete containing water storage materials, with time through the two materials.
2. The traditional method usually adopts mineral admixture (such as fly ash and ground slag powder) to replace part of cement to reduce the hydration temperature rise of concrete, and the material has limited effect on reducing the hydration temperature rise of concrete. When the hydration temperature rise inhibiting component acts with the concrete liquid phase, the dissolution heat and the neutralization heat of the hydration temperature rise inhibiting component are endothermic reactions, so that the heat released by cement hydration can be absorbed, the temperature rise rate and the temperature peak value of the concrete are reduced, and the concrete cracking caused by temperature stress is effectively reduced.
3. The composite anti-cracking component is matched with the water storage component, the water storage component absorbs water to expand when concrete is mixed, and the absorbed water is gradually released after the concrete is hardened so as to improve the internal humidity of the concrete and reduce drying shrinkage; the components such as aluminum powder, azodicarbonamide, difluoride diisoheptanonitrile and the like can release gases such as hydrogen, nitrogen, carbon dioxide and the like in the concrete plasticity stage, so that the concrete in the plasticity stage generates micro-expansion, the plastic shrinkage of the water storage component due to water absorption is effectively counteracted, and the magnesium oxide-calcium oxide double-expansion-source expansion clinker generates expansion components such as calcium hydroxide and magnesium hydroxide with part of water released by the water storage component in the later hardening stage of the concrete to reduce the later shrinkage of the hardened concrete.
4. The reinforcing and toughening component can provide active sites for cement hydration, increase the compactness of hardened set cement, improve the tensile strength of concrete and improve the crack resistance of the hardened concrete.
5. The preparation method is simple, the preparation process is pollution-free, and the slump retaining and crack resistance of the concrete in a severe environment are excellent.
Detailed Description
Detailed description of the examples: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
The following abbreviations will be used in the examples:
JSBT-1: the slump retaining-reducing type high molecular component is synthesized by acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, hydroxyethyl acrylate and sodium methallylsulfonate and prepared into powder, and the viscosity average molecular weight is 20000.
JSBT-2: the slump retaining-reducing type high molecular component is synthesized by acrylic acid, 2-acrylamide-2-phenylethanesulfonic acid, hydroxypropyl acrylate, sodium p-styrenesulfonate and disodium diphenylethylene disulfonate and is prepared into powder, wherein the viscosity average molecular weight is 80000.
JSBT-3: the slump retaining-reducing type high molecular component is synthesized by acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, 2-acrylamido-2-phenylethanesulfonic acid, vinyl acetate, sodium methallylsulfonate and disodium diphenylethylene disulfonate and prepared into powder, and the viscosity average molecular weight of the powder is 65000.
Detailed description of the preferred embodiment 1
Mixing 1.0kg of JBBT-1, 0.5kg of sodium alginate, 1.0kg of carbamide and 250m of specific surface area287.4kg of finely ground magnesium oxide-calcium oxide double-expansion-source expansion clinker, 7.6kg of aluminum powder, 0.5kg of methacrylic acid-acrylamide copolymerized cross-linked polymer material and 2kg of graphene oxide are uniformly mixed to obtain the ballastless track base concrete slump-retaining anti-cracking material TKBK-1.
Specific example 2
4.5kg of JBBT-2, 1.5kg of hyaluronic acid, 10.0kg of ammonium chloride and 350m of specific surface area264.68kg of ground magnesium oxide/kgUniformly mixing calcium oxide type double-expansion-source expansion clinker, 1.32kg of azodicarbonamide, 10kg of activated carbon and 8kg of nano silicon dioxide to obtain the concrete slump-retaining anti-cracking material TKBK-2 for the ballastless track base.
Specific example 3
3.0g of JBBT-3, 1.2kg of sodium gluconate, 5.0kg of carbamide and 1.2kg of ammonium chloride and with the specific surface area of 280m271.82kg of finely ground magnesium oxide-calcium oxide double-expansion-source expansion clinker, 3.78kg of azodiisoheptanonitrile, 8.5kg of active carbon and 5.5kg of nano silicon dioxide are uniformly mixed to obtain the concrete slump-retaining anti-cracking material TKBK-3 of the ballastless track base.
Specific example 4
3.5g of JBBT-1, 1.4kg of chitosan, 0.8kg of sodium gluconate and 6.6kg of carbamide with the specific surface area of 260m270.9kg of finely ground magnesium oxide-calcium oxide double-expansion-source expansion clinker, 5.4kg of aluminum powder, 7.2kg of methacrylic acid-acrylamide copolymerization crosslinking type high polymer material and 4.2kg of graphene oxide are uniformly mixed to obtain the ballastless track base concrete slump-retaining anti-cracking material TKBK-4.
Specific example 5
2.8g of JBBT-2, 0.8kg of hyaluronic acid and 320m of specific surface area279.4kg of finely ground magnesium oxide-calcium oxide type double-expansion-source expansion clinker, 3.3kg of azodicarbonamide, 6.6kg of active carbon, 5.1kg of nano silicon dioxide and 2kg of graphene oxide are uniformly mixed to obtain the concrete slump-retaining anti-cracking material TKBK-5 of the ballastless track base.
Specific example 6
The specific surface area is 260m283.03kg of finely ground magnesium oxide-calcium oxide double-expansion-source expansion clinker, 4.37kg of aluminum powder, 8.2kg of methacrylic acid-acrylamide copolymerization crosslinking type high polymer material and 4.4kg of nano silicon dioxide are uniformly mixed to obtain the ballastless track base concrete slump-retaining anti-cracking material DB-1.
Specific example 7
4.5kg of JBBT-1, 3.5kg of hyaluronic acid and 350m of specific surface area270.3kg of ground magnesium oxide-calcium oxide type double-expansion-source expansion clinker, 3.7kg of azodicarbonamide, 10kg of active carbon and8kg of graphene oxide is uniformly mixed to obtain the concrete slump loss resistant and crack resistant material DB-2 of the ballastless track base.
Specific example 8
Uniformly mixing 3.6kg of JBBT-2, 1.3kg of sodium alginate, 4.4kg of carbamide, 8.5kg of methacrylic acid-acrylamide copolymerized cross-linked polymer material and 6kg of graphene oxide to obtain the concrete slump-retaining anti-cracking material DB-3 of the ballastless track base.
Specific example 9
4.1kg of JBBT-3, 1.0kg of chitosan and 320m of specific surface area244.1kg of finely ground magnesium oxide-calcium oxide type double-expansion-source expansion clinker aggregate/kg, 0.9kg of azodicarbonamide and 5kg of nano silicon dioxide are uniformly mixed to obtain the concrete slump-retaining anti-cracking material DB-4 of the ballastless track base.
The implementation effect is as follows:
concrete working performance loss test with time: the test measures the loss of workability of the concrete of each example over time at the same loading. Wherein, the performance of the fresh concrete is executed according to GB/T50080-2016 standard of test method for the performance of common concrete mixture, and the slump and the air content of the fresh concrete in the initial period, 1h, 2h and 3h are respectively tested. Wherein the cement is cube corner P.O 42.5, the fly ash is I-grade ash, the mineral powder is S95 grade, the fine aggregate is river sand with fineness modulus of 2.8, the coarse aggregate is 5-20mm continuous graded broken stone, the mixing amount of the concrete slump-retaining anti-cracking material is 8%, the mixing proportion of the concrete is shown in Table 1, and the specific test result is shown in Table 2. Wherein the slump-retaining and crack-resistant material comprises TKBK-1, TKBK-2, TKBK-3, TKBK-4, TKBK-5, TKBK-6, DB-1, DB-2, DB-3 and DB-4.
Table 1 concrete test mix proportion units: kg of
TABLE 2 working Performance test results for fresh concrete
As can be seen from the data in Table 2, when the test sample was added to concrete, in addition to the great loss of slump with time of the JZ test group and the concrete slump of the admixture DB-1, there was no loss of slump of the concrete admixture and air content within 3h of the admixture with the remaining test sample, wherein there was a slight reverse increase in slump of TKBK-4. Therefore, as the samples of the JZ test group and the DB-1 do not contain the shrinkage-collapse-prevention high molecular component and the setting component, the slump loss of the JZ test group and the fresh concrete doped with the DB-1 is large over time, and the slump loss can not meet the construction requirement after 2 hours.
Testing the mechanical property of the concrete: the test determines the compressive strength of the concrete of each embodiment under the same mixing amount, and the test is carried out according to GB/T50081-2002 Standard of mechanical property test method of common concrete. The compressive strength of the hardened concrete 3d, 7d, 28d, 56d was tested. The concrete mix ratios are shown in table 1, and the results of the compressive strength tests are shown in table 3.
TABLE 3 compression Strength test results of hardened concrete
It can be seen from the data in table 3 that the compressive strengths of the hardened concrete of the JZ test group and the 9 examples satisfy the design requirement of the strength grade C40, and the compressive strength of the concrete doped with each example is not much different from that of the JZ test group. Wherein, the compressive strength of concrete 3d and 7d doped with DB-2 is obviously higher than that of other test groups; the compressive strength of the concrete doped with the other examples is not very different. The reason that the early strength of the concrete doped with DB-2 is higher is that the material does not contain a hydration temperature rise control agent, so that the cement hydration rate is higher and the concrete compressive strength is higher in the early hydration stage.
Early crack resistance test of concrete: the total cracking area of concrete in each example in unit area under the same mixing amount is determined by the test and is executed according to GB/T50082-2009 Standard test method for long-term performance and durability of ordinary concrete. The total crack area, the number of cracks and the average crack area of each crack of the concrete in unit area after 24 hours of action of the blowing device are tested, and the crack reduction coefficient is calculated, wherein the crack reduction coefficient and the crack limiting efficiency grade are executed according to CECS 38:2004 technical Specification for fiber concrete structures. The concrete mix ratio is shown in table 1, and the test results of the early crack resistance test of concrete are shown in table 4.
TABLE 4 early crack resistance test results of concrete
As can be seen from the data in Table 4, the number of cracks of the concrete anti-cracking plate in the JZ test group is the largest, and reaches 4; the number of cracks of the concrete anti-cracking plate doped with TKBK-1 and DB-1 is minimum, and only 1 crack exists; the number of cracks of the concrete anti-cracking plate doped with TKBK-3 and DB-4 is 2; the number of cracks of the concrete anti-cracking plate doped with TKBK-2, TKBK-4 and DB-3 is 3. In addition, the total cracking area of the concrete crack resistant plate in the JZ test group in unit area is the largest and reaches 880mm2/m2(ii) a After the slump loss resistant anti-cracking material is doped, the anti-cracking performance of the concrete is improved, wherein the crack reduction coefficient of the concrete doped with the TKBK-5 reaches 92%, and the concrete has excellent anti-cracking performance; and the concrete crack reduction coefficients of the blended TKBK-1, TKBK-2, TKBK-3, TKBK-4, TKBK-5, DB-1 and DB-2 exceed 70 percent, and the crack limiting efficiency grades reach the first grade. However, the concrete added with DB-3 has the crack resistance obviously lower than that of other tested components, while the crack reduction coefficient of the concrete added with DB-4 is 64 percent, and the crack limiting efficiency grade is only 'second grade'. The reason is because: in the concrete slump-retaining anti-cracking material, the composite anti-cracking component can effectively reduce the shrinkage of concrete and improve the anti-cracking capability of the concrete; the water storage component and the composite anti-cracking component have synergistic effect, and the anti-cracking capacity of the anti-cracking component can be effectively improved.
The following conclusions can be drawn by testing: the slump loss-resistant high polymer component and the slow setting component in the slump loss-resistant anti-cracking material can effectively reduce the loss of the workability of the concrete over time, the hydration temperature rise inhibiting component can obviously reduce the adiabatic temperature rise of the concrete, and the composite anti-cracking component, the water storage component and the reinforcing and toughening component can improve the anti-cracking performance of the concrete. By fully playing the comprehensive superposition effect of each component in the slump retaining and cracking resistant material, the concrete slump for 3 hours can be free from time loss, the maximum crack reduction coefficient can reach 92%, and the crack limiting efficiency grade reaches 'first grade'.
The embodiments of the present invention have been described in detail. However, the present invention is not limited to the above embodiment, and various changes may be made without departing from the spirit of the present invention.
Claims (7)
1. The slump-retaining and crack-resistant material for the ballastless track base concrete is characterized by being prepared by mixing a shrinkage-reducing slump-retaining high polymer component, a retarding component, a hydration temperature rise inhibiting component, a composite crack-resistant component, a water storage component and a reinforcing and toughening component in a certain ratio, wherein the mass ratio of the components is as follows:
reducing-slump retaining type high molecular component: 1.0-4.5 parts;
a retarding component: 0.5-1.5 parts;
hydration temperature rise inhibiting component: 1-10 parts;
composite anti-crack component: 66-95 parts;
a water storage component: 0.5-10 parts;
a reinforcing and toughening component: 2-8 parts;
the preparation method comprises the following steps:
the shrinkage-reduction-collapse-prevention high polymer component, the retarding component, the hydration temperature rise inhibiting component, the composite anti-cracking component, the water storage component and the reinforcing and toughening component are uniformly mixed according to the proportion range listed by the invention to prepare the product.
2. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the shrinkage-reduction slump-retaining polymer component is a powder polymer material containing carboxyl and amido functional groups and one or two functional groups of ester groups and sulfonic groups, and the viscosity average molecular weight is 20000-80000. The functional group containing carboxyl is acrylic acid monomer, the functional group containing amido is one or two mixtures of 2-acrylamide-2-methylpropanesulfonic acid and 2-acrylamide-2-phenylethanesulfonic acid monomer, the functional group containing ester is one or more mixtures of hydroxyethyl acrylate, hydroxypropyl acrylate and vinyl acetate monomer, and the functional group containing sulfonic acid is one or more mixtures of sodium methallyl sulfonate, sodium p-styrene sulfonate monomer and disodium diphenylethylene disulfonate.
3. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the retarding component is one or a mixture of more of sodium gluconate, sodium alginate and hyaluronic acid.
4. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the hydration temperature rise inhibiting component is one or two of carbamide and ammonium chloride.
5. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the composite anti-cracking component comprises an anti-cracking component in a concrete plasticity stage and an anti-cracking component in a concrete hardening stage, wherein the anti-cracking component in the concrete plasticity stage is one of aluminum powder, azodicarbonamide and difluorine, and accounts for 2-8% of the composite anti-cracking component; the crack-resistant component in the hardening stage of the concrete is ground magnesium oxide-calcium oxide double-expansion-source expansion clinker with the specific surface area of 250-350 m2And/kg, which accounts for 92-98% of the composite anti-cracking component.
6. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the water storage component is one or two of methacrylic acid-acrylamide copolymerization crosslinking type high molecular materials and activated carbon. The particle size of the water storage component is 280-850 mu m.
7. The ballastless track base concrete slump-retaining and crack-resisting material and the preparation method thereof according to claim 1 are characterized in that: the reinforcing and toughening component is one or two of graphene oxide and nano silicon dioxide.
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| CN115140997A (en) * | 2022-07-22 | 2022-10-04 | 交通运输部公路科学研究所 | Coal-based solid waste type anti-cracking agent for cement stabilized pavement base material |
| CN115974464A (en) * | 2022-12-02 | 2023-04-18 | 中南大学 | Anti-cracking ballastless track bed plate concrete and preparation method thereof |
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| CN113402199A (en) * | 2021-07-30 | 2021-09-17 | 中国水利水电第七工程局有限公司 | Additive, cement stabilized base applying additive and preparation method of cement stabilized base |
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| CN115140997A (en) * | 2022-07-22 | 2022-10-04 | 交通运输部公路科学研究所 | Coal-based solid waste type anti-cracking agent for cement stabilized pavement base material |
| CN115140997B (en) * | 2022-07-22 | 2023-01-17 | 交通运输部公路科学研究所 | Coal-based solid waste type anti-cracking agent for cement stabilized pavement base material |
| CN115974464A (en) * | 2022-12-02 | 2023-04-18 | 中南大学 | Anti-cracking ballastless track bed plate concrete and preparation method thereof |
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