Multi-solid-waste asphalt concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, in particular to multi-solid-waste asphalt concrete and a preparation method thereof. The multi-solid-waste asphalt concrete is prepared from the following raw materials in parts by weight: 8-15 parts of waste asphalt, 30-40 parts of slag, 60-65 parts of quartz sand, 2-5 parts of bentonite, 40-60 parts of a composite cementing material, 1-3 parts of modified fibers, 1-3 parts of an alkali activator and 3-5 parts of water, the composite cementing material comprises steel slag micropowder, phosphogypsum, calcium aluminate cement, citrate gypsum, lead-zinc slag and citric acid. According to the multi-solid-waste asphalt concrete provided by the invention, through reasonable proportioning and synergistic effect of the raw materials, not only can various solid wastes be fully utilized, but also the multi-solid-waste asphalt concrete has relatively high strength and good durability and crack resistance. The concrete has a wide application prospect in practical application, the problem of treatment of solid wastes can be effectively solved, and meanwhile, the performance of the concrete is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and specifically, to a multi-solid waste asphalt concrete and a preparation method thereof. Background Art

[0002] With the acceleration of the urbanization process and the continuous advancement of infrastructure construction, the demand for high-performance concrete materials is increasing day by day. Traditional asphalt concrete has certain limitations in terms of strength, durability, and crack resistance, and it is difficult to meet the requirements of modern projects for high-performance materials. At the same time, the accumulation of a large amount of industrial solid wastes such as slag, steel slag, and phosphogypsum not only occupies land resources but also may pose a potential threat to the environment.

[0003] In the prior art, the application research on solid wastes in concrete mostly focuses on the utilization of single-variety wastes. For example, slag powder partially replaces cement to improve the workability and strength of concrete, or steel slag is used as a road base material, etc. However, these methods fail to fully utilize the composite effect of multiple solid wastes and also fail to effectively solve the balance problem between the strength and durability of concrete. In addition, although the fiber-reinforced concrete technology has been mature, traditional fibers such as steel fibers and polypropylene fibers still have room for improvement in terms of cost, durability, and bonding performance with the matrix. Summary of the Invention

[0004] In view of this, the present invention is committed to providing a multi-solid waste asphalt concrete and a preparation method thereof. Through reasonable proportioning and synergistic effects, multiple solid wastes are fully utilized to improve the strength, durability, and crack resistance of concrete, realize the resource utilization of solid wastes, and at the same time reduce production costs, with significant environmental and economic benefits.

[0005] In order to solve the above technical problems, the present application is implemented as follows:

[0006] The present invention provides a multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0007] 8-15 parts of waste asphalt, 30-40 parts of slag, 60-65 parts of quartz sand, 2-5 parts of bentonite, 40-60 parts of composite cementitious material, 1-3 parts of modified fiber, 1-3 parts of alkali activator, and 3-5 parts of water;

[0008] The composite cementitious material comprises steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag, and citric acid.

[0009] Preferably, in the above multi-solid waste asphalt concrete, the composite cementitious material comprises the following raw materials in parts by weight:

[0010] 15 - 20 parts of steel slag powder, 15 - 20 parts of lead - zinc slag, 20 - 30 parts of phosphogypsum, 20 - 30 parts of calcium aluminate cement, 10 - 15 parts of citric acid gypsum, and 4 - 5 parts of citric acid.

[0011] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the preparation method of the modified fiber includes the following steps:

[0012] Soak basalt fiber in a mixed solution of silane coupling agent and ethanol for the first reaction to obtain treated basalt fiber;

[0013] Mix the treated basalt fiber, 3,7 - dibenzothiophene dicarboxylic acid, p - hydroxybenzoic acid, triethylamine, and N - methylpyrrolidone for the second reaction to obtain modified fiber.

[0014] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the silane coupling agent includes γ - aminopropyltriethoxysilane;

[0015] The dosage ratio of the silane coupling agent to ethanol is 5 - 10 g:50 mL.

[0016] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the temperature of the first reaction is 100 - 120 °C, and the time of the first reaction is 1 - 3 h.

[0017] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the dosage ratio of the treated basalt fiber, 3,7 - dibenzothiophene dicarboxylic acid, p - hydroxybenzoic acid, triethylamine, and N - methylpyrrolidone is 10 g:3 - 4 g:1 - 2 g:4 - 5 g:50 - 100 mL.

[0018] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the temperature of the second reaction is 70 - 80 °C, the time of the second reaction is 5 - 8 h, the atmosphere of the second reaction is an inert atmosphere, and the inert atmosphere includes nitrogen.

[0019] Preferably, in the above - mentioned multi - solid - waste asphalt concrete, the alkali activator includes sodium hydroxide and water glass;

[0020] The mass ratio of sodium hydroxide to water glass is 1:8 - 10.

[0021] The present invention also provides a preparation method of multi - solid - waste asphalt concrete, including the following steps:

[0022] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead - zinc slag, and citric acid to obtain a composite cementitious material;

[0023] Waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator and water are mixed to obtain multi-solid waste asphalt concrete.

[0024] Through the above technical solutions, the beneficial technical effects of the present invention are as follows:

[0025] (1) The multi-solid waste asphalt concrete provided by the present invention, through the reasonable proportioning and synergistic effect of the raw materials, can not only make full use of various solid wastes, but also has high strength, good durability and crack resistance. This kind of concrete has broad application prospects in practical applications, can effectively solve the problem of solid waste treatment, and at the same time improve the performance of concrete.

[0026] (2) In the multi-solid waste asphalt concrete provided by the present invention, the composite cementitious material includes steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag and citric acid. Among them, citric acid forms a "retarding - accelerating - slow - release" ternary system with phosphogypsum and calcium aluminate, thereby effectively improving the strength of the cementitious material; citric acid reduces the pH of the system, promotes the depolymerization of the glass body in the lead-zinc slag, and accelerates the pozzolanic reaction with the hydration products of the steel slag; the steel slag powder fills the large pores, and the lead-zinc slag nanoparticles (average particle size 2μm) refine the mesopores. The citric acid gypsum crystals induce the directional growth of C-S-H on the pore surface, and also inhibit the disordered growth of ettringite, forming an intertwined needle-like AFt network to enhance the structural continuity; through the reasonable proportioning and synergistic effect of the above substances, the multi-solid waste asphalt concrete of the present invention can not only make full use of various solid wastes, but also has high strength, good durability and crack resistance.

[0027] (3) In the multi-solid waste asphalt concrete provided by the present invention, after the basalt fiber is treated with a silane coupling agent, 3,7-dibenzothiophene dicarboxylic acid and p-hydroxybenzoic acid are then used to modify the treated basalt fiber; among them, first, the surface of the basalt fiber is pre-modified with a silane coupling agent. On the one hand, it can enhance the interfacial bonding force between the basalt fiber and the matrix. On the other hand, more amino groups or epoxy groups are introduced on the surface of the basalt fiber, providing active sites for subsequent reactions; the carboxylic acid groups in 3,7-dibenzothiophene dicarboxylic acid and p-hydroxybenzoic acid can react with the hydroxyl groups on the fiber surface or the silane coupling agent to form chemical bonds, forming a "fiber-coupling agent-carboxylic acid" covalent bridge, thereby improving the interfacial bonding force; at the same time, the aromatic ring or heterocyclic structure (such as dibenzothiophene) in 3,7-dibenzothiophene dicarboxylic acid and p-hydroxybenzoic acid can form intermolecular forces through π-π stacking, significantly improving the rigidity and anti-deformation ability of the fiber. The modified fiber surface forms more chemical or physical bonding points with the matrix through the cyclic structure, which can enhance the stress transfer efficiency between the fiber and the matrix, thereby improving the overall strength of the concrete. Through reasonable proportioning and process control, the synergistic effect of these raw materials enables the modified fiber to achieve comprehensive optimization in terms of mechanical properties and environmental adaptability, significantly improving the engineering performance of the multi-solid waste asphalt concrete. Detailed implementation mode

[0028] The present invention discloses a multi-solid waste asphalt concrete and a preparation method thereof. Those skilled in the art can draw on the content of this article and appropriately modify the process parameters to achieve it. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and those related can obviously make changes or appropriate changes and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0029] In the description of the present invention, a list of items connected by the term "at least one of" or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0030] The endpoints and any values in the ranges disclosed herein are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range or between individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0031] Unless otherwise specified, all embodiments and alternative embodiments of this application can be combined with each other to form new technical solutions.

[0032] Unless otherwise specified, all technical features and alternative technical features of this application can be combined with each other to form new technical solutions.

[0033] Unless otherwise specified, the "including" and "comprising" mentioned in this application mean open-ended, and can also be closed-ended. For example, the "including" and "comprising" can mean that other components not listed can also be included or comprised, or can only include or comprise the listed components.

[0034] The present invention provides a multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0035] 8-15 parts of waste asphalt, 30-40 parts of slag, 60-65 parts of quartz sand, 2-5 parts of bentonite, 40-60 parts of composite cementitious material, 1-3 parts of modified fiber, 1-3 parts of alkali activator and 3-5 parts of water.

[0036] In the present invention, the weight part of waste asphalt in the multi-solid waste asphalt concrete is preferably 8-15 parts, more preferably 9-14 parts, and still more preferably 10-12 parts.

[0037] In the present invention, the weight part of slag in the multi-solid waste asphalt concrete is preferably 30-40 parts, more preferably 32-38 parts, and still more preferably 35-36 parts.

[0038] In the present invention, the weight part of quartz sand in the multi-solid waste asphalt concrete is preferably 60-65 parts, more preferably 61-64 parts, and still more preferably 62-63 parts.

[0039] In the present invention, the weight part of bentonite in the multi-solid waste asphalt concrete is preferably 2-5 parts, more preferably 2.5-4 parts, and still more preferably 3-3.5 parts.

[0040] In the present invention, the weight part of composite cementitious material in the multi-solid waste asphalt concrete is preferably 40-60 parts, more preferably 42-55 parts, and still more preferably 45-50 parts.

[0041] In the present invention, the weight portion of the modified fiber in the multi-solid waste asphalt concrete is preferably 1 to 3 parts, more preferably 1.5 to 2.5 parts, and even more preferably 1.8 to 2 parts.

[0042] In the present invention, the weight portion of the alkali activator in the multi-solid waste asphalt concrete is preferably 1 to 3 parts, more preferably 1.5 to 2.5 parts, and even more preferably 1.8 to 2 parts.

[0043] In the present invention, the weight portion of the water in the multi-solid waste asphalt concrete is preferably 3.5 to 4.5 parts, and more preferably 4 to 4.2 parts.

[0044] In the present invention, the composite cementitious material includes steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, and lead-zinc slag.

[0045] In the present invention, the composite cementitious material comprises raw materials in the following weight portions:

[0046] 15 - 20 parts of steel slag powder, 15 - 20 parts of lead-zinc slag, 20 - 30 parts of phosphogypsum, 20 - 30 parts of calcium aluminate cement, 10 - 15 parts of citric acid gypsum, and 4 - 5 parts of citric acid.

[0047] In the present invention, the weight portion of the steel slag powder in the composite cementitious material is preferably 15 - 20 parts, more preferably 16 - 19 parts, and even more preferably 17 - 18 parts.

[0048] In the present invention, the weight portion of the lead-zinc slag in the composite cementitious material is preferably 15 - 20 parts, more preferably 16 - 19 parts, and even more preferably 17 - 18 parts.

[0049] In the present invention, the weight portion of the phosphogypsum in the composite cementitious material is preferably 20 - 30 parts, more preferably 22 - 28 parts, and even more preferably 25 - 26 parts.

[0050] In the present invention, the weight portion of the calcium aluminate cement in the composite cementitious material is preferably 20 - 30 parts, more preferably 22 - 28 parts, and even more preferably 25 - 26 parts.

[0051] In the present invention, the weight portion of the citric acid gypsum in the composite cementitious material is preferably 15 - 20 parts, more preferably 16 - 19 parts, and even more preferably 17 - 18 parts.

[0052] In the present invention, the weight portion of the citric acid in the composite gel material is preferably 4 - 5 parts, more preferably 4.2 - 4.8 parts, and even more preferably 4.5 parts.

[0053] In the present invention, the preparation method of the modified fiber includes the following steps:

[0054] Mix basalt fiber and silane coupling agent, and carry out the first reaction to obtain treated basalt fiber;

[0055] Mix the treated basalt fiber, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone, and carry out the second reaction to obtain modified fiber.

[0056] In the present invention, the silane coupling agent includes γ-aminopropyltriethoxysilane.

[0057] In the present invention, the dosage ratio of the silane coupling agent to ethanol is preferably 5-10 g:50 mL, more preferably 6-9 g:50 mL, and even more preferably 7-8 g:50 mL.

[0058] In the present invention, the temperature of the first reaction is preferably 100-120 °C, more preferably 105-115 °C, and even more preferably 108-110 °C; the time of the first reaction is preferably 1-3 h, more preferably 1.5-2.5 h, and even more preferably 2 h.

[0059] In the present invention, the dosage ratio of the treated basalt fiber, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone is preferably 10 g:3-4 g:1-2 g:4-5 g:50-100 mL, more preferably 10 g:3.2-3.7 g:1.3-1.8 g:4.1-4.9 g:60-90 mL, and even more preferably 10 g:3.4-3.5 g:1.5-1.7 g:4.4-4.5 g:70-85 mL.

[0060] In the present invention, the temperature of the second reaction is preferably 70-80 °C, more preferably 72-78 °C, and even more preferably 75-76 °C; the time of the second reaction is preferably 5-8 h, more preferably 5.5-7 h, and even more preferably 6-6.5 h; the atmosphere of the second reaction is preferably an inert atmosphere, and the inert atmosphere includes nitrogen.

[0061] In the present invention, the alkali activator includes sodium hydroxide and water glass.

[0062] In the present invention, the mass ratio of sodium hydroxide to water glass is preferably 1:8-10, more preferably 1:8.5-9.5, and even more preferably 1:8.6-9.

[0063] The present invention also provides a preparation method of multi-solid waste asphalt concrete, comprising the following steps:

[0064] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag and citric acid to obtain a composite cementitious material;

[0065] Waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator and water are mixed to obtain multi-solid waste asphalt concrete.

[0066] The present invention will be further described in detail by the following examples. The raw materials used in the examples can all be obtained through commercial channels.

[0067] Example 1

[0068] A multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0069] 85 parts of waste asphalt, 35 parts of slag, 60 parts of quartz sand, 3 parts of bentonite, 45 parts of composite cementitious material, 3 parts of modified fiber, 3 parts of alkali activator (the mass ratio of sodium hydroxide to water glass is 1:8) and 5 parts of water;

[0070] Among them, the composite cementitious material comprises the following raw materials in parts by weight:

[0071] 15 parts of steel slag powder, 20 parts of lead-zinc slag, 25 parts of phosphogypsum, 25 parts of calcium aluminate cement, 12 parts of citric acid gypsum and 4 parts of citric acid;

[0072] The preparation method of the modified fiber comprises the following steps:

[0073] Soak basalt fiber in a mixed solution of silane coupling agent γ-aminopropyltriethoxysilane and ethanol (γ-aminopropyltriethoxysilane:ethanol = 5 - 10 g:50 mL) and react at 100 - 120 °C for 1 - 3 h to obtain treated basalt fiber;

[0074] Mix the treated basalt fiber, 3,7-dibenzothiophenedicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone. The dosage ratio of the treated basalt fiber, 3,7-dibenzothiophenedicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone is 10 g:3.8 g:2.5 g:5 g:100 mL, and react at 70 °C for 6 h under a nitrogen atmosphere to obtain the modified fiber.

[0075] The preparation method of the multi-solid waste asphalt concrete comprises the following steps:

[0076] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag and citric acid to obtain a composite cementitious material;

[0077] Mix waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator and water to obtain multi-solid waste asphalt concrete.

[0078] Example 2

[0079] A multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0080] 12 parts of waste asphalt, 40 parts of slag, 64 parts of quartz sand, 4 parts of bentonite, 50 parts of composite cementitious material, 1 part of modified fiber, 3 parts of alkali activator (mass ratio of sodium hydroxide to water glass is 1:8), and 5 parts of water;

[0081] Among them, the composite cementitious material comprises the following raw materials in parts by weight:

[0082] 17 parts of steel slag powder, 15 parts of lead-zinc slag, 20 parts of phosphogypsum, 20 parts of calcium aluminate cement, 14 parts of citric acid gypsum, and 4.5 parts of citric acid;

[0083] The preparation method of the modified fiber comprises the following steps:

[0084] Soak basalt fiber in a mixed solution of silane coupling agent γ-aminopropyltriethoxysilane and ethanol (γ-aminopropyltriethoxysilane:ethanol = 5-10 g:50 mL) and react at 100-120 °C for 1-3 h to obtain treated basalt fiber;

[0085] Mix the treated basalt fiber, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine, and N-methylpyrrolidone. The dosage ratio of the treated basalt fiber, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine, and N-methylpyrrolidone is 10 g:3 g:2 g:4 g:100 mL, and react at 80 °C for 6 h under a nitrogen atmosphere to obtain the modified fiber.

[0086] The preparation method of the multi-solid waste asphalt concrete comprises the following steps:

[0087] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag, and citric acid to obtain a composite cementitious material;

[0088] Mix waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator, and water to obtain the multi-solid waste asphalt concrete.

[0089] Example 3

[0090] A multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0091] 15 parts of waste asphalt, 32 parts of slag, 64 parts of quartz sand, 4 parts of bentonite, 45 parts of composite cementitious material, 2 parts of modified fiber, 3 parts of alkali activator (mass ratio of sodium hydroxide to water glass is 1:9), and 5 parts of water;

[0092] Among them, the composite cementitious material comprises the following raw materials in parts by weight:

[0093] 18 parts of steel slag powder, 20 parts of lead-zinc slag, 25 parts of phosphogypsum, 25 parts of calcium aluminate cement, 12 parts of citric acid gypsum and 4 parts of citric acid;

[0094] The preparation method of the modified fiber comprises the following steps:

[0095] Soak basalt fiber in a mixed solution of silane coupling agent γ-aminopropyltriethoxysilane and ethanol (γ-aminopropyltriethoxysilane:ethanol = 5 - 10 g:50 mL), and carry out the first reaction at 100 - 120 °C for 1 - 3 h to obtain the treated basalt fiber;

[0096] Mix the treated basalt fiber, 3,7-dibenzothiophenedicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone. The dosage ratio of the treated basalt fiber, 3,7-dibenzothiophenedicarboxylic acid, p-hydroxybenzoic acid, triethylamine and N-methylpyrrolidone is 10 g:3.5 g:2 g:5 g:100 mL, and carry out the reaction at 80 °C for 7 h under a nitrogen atmosphere to obtain the modified fiber.

[0097] The preparation method of multi-solid waste asphalt concrete comprises the following steps:

[0098] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag and citric acid to obtain a composite cementitious material;

[0099] Mix waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator and water to obtain multi-solid waste asphalt concrete.

[0100] Example 4

[0101] A multi-solid waste asphalt concrete, comprising the following raw materials in parts by weight:

[0102] 13 parts of waste asphalt, 37 parts of slag, 62 parts of quartz sand, 2 parts of bentonite, 55 parts of composite cementitious material, 3 parts of modified fiber, 3 parts of alkali activator (the mass ratio of sodium hydroxide to water glass is 1:10) and 5 parts of water;

[0103] Among them, the composite cementitious material contains the following raw materials in parts by weight:

[0104] 18 parts of steel slag powder, 20 parts of lead-zinc slag, 28 parts of phosphogypsum, 30 parts of calcium aluminate cement, 12 parts of citric acid gypsum and 5 parts of citric acid;

[0105] The preparation method of the modified fiber comprises the following steps:

[0106] Soak basalt fibers in a mixed solution of silane coupling agent γ-aminopropyltriethoxysilane and ethanol (γ-aminopropyltriethoxysilane:ethanol = 5 - 10 g:50 mL) and carry out a first reaction at 100 - 120 °C for 1 - 3 h to obtain treated basalt fibers;

[0107] Mix the treated basalt fibers, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine, and N-methylpyrrolidone. The dosage ratio of the treated basalt fibers, 3,7-dibenzothiophene dicarboxylic acid, p-hydroxybenzoic acid, triethylamine, and N-methylpyrrolidone is 10 g:4 g:2 g:5 g:60 mL, and react at 70 - 80 °C for 5 - 8 h under a nitrogen atmosphere to obtain modified fibers.

[0108] A preparation method of multi-solid waste asphalt concrete, comprising the following steps:

[0109] Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead-zinc slag, and citric acid to obtain a composite cementitious material;

[0110] Mix waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fibers, alkali activator, and water to obtain multi-solid waste asphalt concrete.

[0111] Comparative Example 1

[0112] A multi-solid waste asphalt concrete, which is the same as Example 1, except that: the composite cementitious material contains the following raw materials in parts by weight: 15 parts of steel slag powder.

[0113] Comparative Example 2

[0114] A multi-solid waste asphalt concrete, which is the same as Example 1, except that: the composite cementitious material contains the following raw materials in parts by weight: 15 parts of steel slag powder, 20 parts of lead-zinc slag.

[0115] Comparative Example 3

[0116] A multi-solid waste asphalt concrete, which is the same as Example 1, except that: the composite cementitious material contains the following raw materials in parts by weight: 15 parts of steel slag powder, 20 parts of lead-zinc slag, 25 parts of phosphogypsum.

[0117] Comparative Example 4

[0118] A multi-solid waste asphalt concrete, which is the same as Example 1, except that: the composite cementitious material contains the following raw materials in parts by weight: 15 parts of steel slag powder, 20 parts of lead-zinc slag, 25 parts of phosphogypsum, 25 parts of calcium aluminate cement.

[0119] Comparative Example 5

[0120] A multi-solid waste asphalt concrete, which is the same as that in Example 1, except that the composite cementitious material comprises the following raw materials in parts by weight: 15 parts of steel slag powder, 20 parts of lead-zinc slag, 25 parts of phosphogypsum, 25 parts of calcium aluminate cement, and 12 parts of citric acid gypsum.

[0121] Comparative Example 6

[0122] A multi-solid waste asphalt concrete, which is the same as that in Example 1, except that 1-3 parts of modified fiber are replaced by basalt fiber.

[0123] Performance tests were carried out on the multi-solid waste asphalt concrete prepared in the above examples and comparative examples. The specific comparison data are shown in Table 1 below:

[0124] Table 1

[0125]

[0126]

[0127] As can be seen from Table 1, the compressive strength and bonding strength of the multi-solid waste asphalt concrete prepared in Examples 1-4 are significantly higher than those in Comparative Examples 1-6, indicating that the use of the composite cementitious material and the modified fiber significantly improves the performance of the concrete. The lack of components in the composite cementitious material in Comparative Examples 1-5 leads to a gradual decrease in the compressive strength and bonding strength of the concrete, indicating that the synergistic effect of each component in the composite cementitious material is crucial for the improvement of the concrete performance. In Comparative Example 6, the modified fiber is replaced by ordinary basalt fiber, resulting in a significant decrease in the compressive strength and bonding strength of the concrete, indicating that the modified fiber plays an important role in improving the concrete performance.

[0128] Through the comparison of the above examples and comparative examples, it can be seen that the multi-solid waste asphalt concrete of the present invention makes full use of a variety of solid wastes through reasonable proportioning and synergistic effects, and significantly improves the strength, durability and crack resistance of the concrete. The use of the composite cementitious material and the modified fiber is the key factor for improving the concrete performance.

[0129] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A multi-solid waste asphalt concrete, characterized in that, It includes raw materials in the following parts by weight: 8 - 15 parts of waste asphalt, 30 - 40 parts of slag, 60 - 65 parts of quartz sand, 2 - 5 parts of bentonite, 40 - 60 parts of composite cementitious material, 1 - 3 parts of modified fiber, 1 - 3 parts of alkali activator, and 3 - 5 parts of water; The composite cementitious material includes steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead - zinc slag, and citric acid.

2. The multi-solid waste asphalt concrete according to claim 1, wherein The composite cementitious material contains raw materials in the following parts by weight: 15 - 20 parts of steel slag powder, 15 - 20 parts of lead - zinc slag, 20 - 30 parts of phosphogypsum, 20 - 30 parts of calcium aluminate cement, 10 - 15 parts of citric acid gypsum, and 4 - 5 parts of citric acid.

3. The multi-solid waste asphalt concrete according to claim 1, wherein The preparation method of the modified fiber includes the following steps: Soak basalt fiber in a mixed solution of silane coupling agent and ethanol for the first reaction to obtain treated basalt fiber; Mix the treated basalt fiber, 3,7 - dibenzothiophene dicarboxylic acid, p - hydroxybenzoic acid, triethylamine, and N - methylpyrrolidone for the second reaction to obtain the modified fiber.

4. The multi-solid waste asphalt concrete according to claim 3, characterized in that, The silane coupling agent includes γ - aminopropyltriethoxysilane; The dosage ratio of the silane coupling agent to ethanol is 5 - 10 g:50 mL.

5. The multi-solid waste asphalt concrete according to claim 3, wherein The temperature of the first reaction is 100 - 120 °C, and the time of the first reaction is 1 - 3 h.

6. The multi-solid waste asphalt concrete according to claim 3, wherein, The dosage ratio of the treated basalt fiber, 3,7 - dibenzothiophene dicarboxylic acid, p - hydroxybenzoic acid, triethylamine, and N - methylpyrrolidone is 10 g:3 - 4 g:1 - 2 g:4 - 5 g:50 - 100 mL.

7. The multi-solid waste asphalt concrete according to claim 3, wherein The temperature of the second reaction is 70 - 80 °C, the time of the second reaction is 5 - 8 h, and the atmosphere of the second reaction is an inert atmosphere.

8. The multi-solid waste asphalt concrete according to claim 1, wherein, The alkali activator includes sodium hydroxide and water glass; The mass ratio of sodium hydroxide to water glass is 1:8 - 10.

9. The preparation method of the multi-solid waste asphalt concrete according to any one of claims 1 to 8, characterized in that It includes the following steps: Mix steel slag powder, phosphogypsum, calcium aluminate cement, citric acid gypsum, lead - zinc slag, and citric acid to obtain a composite cementitious material; Mix waste asphalt, slag, quartz sand, bentonite, composite cementitious material, modified fiber, alkali activator, and water to obtain multi - solid - waste asphalt concrete.

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