High-volume solid waste anti-freezing concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, in particular to high-volume solid waste anti-freezing concrete and a preparation method thereof.The preparation method comprises the following steps that cement, coal ash, furnace slag, desulfurized gypsum, mineral powder, fine aggregate and coarse aggregate are added into a stirrer, dry stirring is conducted for a period of time, then water is added, and stirring is conducted till the mixture is uniform and consistent. According to the high-dosage solid waste anti-freezing concrete disclosed by the invention, materials with volcanic ash activity, such as the fly ash, the slag, the desulfurized gypsum and the slag, are fully reacted by adopting a relatively small dosage of cement, and more compact C-(A)-S-H gel structures can be formed in a cementing material along with the continuous increase of the amount of the mineral powder replacing the fly ash, so that the anti-freezing performance of the concrete is improved. The pore structure of the low-carbon concrete is optimized, and the anti-freezing performance of the low-carbon concrete is effectively enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and in particular to a high-volume solid waste antifreeze concrete and a preparation method thereof. Background Art

[0002] Low-carbon concrete is a new type of environmentally friendly building material that reduces carbon emissions by reducing cement usage or using alternative materials. Its core lies in using industrial by-products (such as fly ash, slag) or new cementitious materials to replace traditional cement, thereby reducing carbon dioxide emissions during the production process. Compared with concrete made from ordinary Portland cement, low-carbon concrete has the advantages of low carbon and environmental protection, greater durability and resource recycling. Solid waste materials such as fly ash and mineral powder can improve the concrete's frost resistance and resistance to chloride ion corrosion; in addition, during the reaction process, it can reduce the heat of hydration, thereby reducing the risk of concrete cracking. Therefore, low-carbon concrete achieves better long-term performance at a lower environmental cost, and is the core direction of green building materials.

[0003] my country's overreliance on cement for infrastructure construction has led to significant resource depletion and carbon emissions. Every ton of cement produced releases approximately 0.8 tons of CO2. Meanwhile, the conflict between the accumulation of industrial solid waste and its inefficient utilization is becoming increasingly acute. For example, Inner Mongolia, a hub for energy and heavy industry, produces over 120 million tons of solid wastes such as fly ash, slag, and desulfurized gypsum annually, with a comprehensive utilization rate of less than 30%. Long-term storage poses risks of land occupation, dust pollution, and groundwater contamination. While existing concrete technologies can incorporate some solid wastes such as fly ash and mineral powder, the dosage is generally less than 40% of the total cementitious material. Furthermore, the varying reactivity of individual solid wastes can easily lead to insufficient concrete strength in later stages. Increasing the dosage significantly reduces frost resistance due to inadequate hydration reactions and degraded pore structures. In Inner Mongolia's harsh climate, traditional solid waste concrete, due to its well-developed capillary structure, is prone to cracking and spalling after freeze-thaw cycles, severely restricting the regional application of solid waste building materials. Current research focuses on the synergistic effects of multiple solid wastes, such as using fly ash, mineral powder, and other materials to replace cement. While Inner Mongolia boasts a wide variety of solid waste types, practical applications are often limited to simple compounding, lacking multi-component grading optimization and reaction control. This results in difficulties in achieving a synergistic effect between compressive strength and frost resistance when high solid waste content (≥60%) is used. Developing concrete technologies that combine high solid waste content with frost resistance is a key requirement for addressing the region's solid waste dilemma and promoting the upgrading of green building materials. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a large amount of solid waste antifreeze concrete and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] The present invention provides a high-volume solid waste frost-resistant concrete, which comprises the following components in parts by mass:

[0007]

[0008] Preferably, the fine aggregate is river sand, and the river sand passes through a 4.75 mm square hole sieve;

[0009] Preferably, the coarse aggregate is crushed stone, and the coarse aggregate meets the continuous grading requirements, with 4.75mm-9.5mm accounting for 42%, 9.5mm-13.2mm accounting for 28%, 13.2mm-16mm accounting for 16%, and 16mm-19mm accounting for 14%.

[0010] Preferably, the slag is passed through a 0.3 mm square hole sieve, and the desulfurized gypsum is passed through a 190 mesh sieve.

[0011] Preferably, the fine aggregate is river sand, and the river sand treatment process is as follows: (1) water washing: the river sand is washed with a high-pressure water gun at a water pressure of not less than 0.5 MPa for a continuous washing time of ≥30 minutes to remove clay and organic matter attached to the surface;

[0012] (2) Drying: Place the washed river sand in a ventilated and dry environment, control the ambient temperature to 25-35°C and the relative humidity to ≤60%, and dry it to a moisture content of ≤0.5%;

[0013] (3) Screening treatment: The dried river sand is passed through a 4.75 mm square hole sieve. After screening, particles with a particle size of ≤4.75 mm are retained, and the fineness modulus is controlled within the range of 2.3-2.6.

[0014] Preferably, the coarse aggregate is crushed stone. The crushed stone used in the test should be washed with water for 24 hours and then dried to obtain the standard crushed stone used in the test. The coarse aggregate meets the continuous grading requirements, with 4.75mm-9.5mm accounting for 42%, 9.5mm-13.2mm accounting for 28%, 13.2mm-16mm accounting for 16%, and 16mm-19mm accounting for 14%.

[0015] Preferably, the method for treating slag and desulfurized gypsum comprises the following steps:

[0016] (1) Drying treatment: Place the slag and desulfurized gypsum in an oven separately and dry them at a constant temperature of 115±5°C until the moisture content is ≤0.3%. The drying time is ≥4 hours for slag and ≥2 hours for desulfurized gypsum;

[0017] (2) Screening treatment:

[0018] The dried slag passes through a 0.3mm square hole sieve, and after screening, particles with a particle size of ≤0.3mm are retained, and the particle gradation meets the following requirements: particles with a particle size of ≤0.15mm account for ≤20%, and particles with a size of 0.15-0.3mm account for ≥80%; the desulfurized gypsum passes through a 190 mesh standard sieve (pore size of about 0.075mm), and after screening, particles with a particle size of ≤0.075mm are retained, and the specific surface area is ≥450m 2 / kg.

[0019] 5-8 parts of a regulator are also added to the antifreeze concrete. The specific preparation method of the regulator is as follows:

[0020] S1: heat-treating the boron nitride at 155-160°C for 1 hour, then heating to 220°C at a rate of 2-5°C / min, holding the temperature for 20 minutes, and then air-cooling to room temperature to obtain heat-treated boron nitride;

[0021] S2: Blending lignocellulose, calcium sulfate whiskers, silicon carbide fibers, and sodium dodecylbenzenesulfonate solution in a weight ratio of (3-5):(2-3):(5-7):13 to obtain a lignocellulose solution;

[0022] 2-3 parts of bismuth titanate, 1-2 parts of lanthanum oxide and 3-5 parts of sodium silicate are fully mixed to obtain an additive;

[0023] S3: stirring the heat-treated boron nitride and the lignocellulose liquid in a weight ratio of 3:5, and completing the stirring to obtain a lignocellulose-conditioned boron nitride agent;

[0024] The boron nitride agent for wood fiber conditioning and the additive are fully blended and ball-milled in a weight ratio of 7:5. After the ball milling is completed, the mixture is filtered and dried to obtain a conditioning agent. The mass fraction of the sodium dodecylbenzenesulfonate solution is 5-8%. The stirring speed of the stirring treatment is 550-750 r / min, and the stirring is carried out for 1 hour. The ball milling speed of the blending is fully ball-milled at 1000-1500 r / min, and the ball milling is carried out for 2 hours.

[0025] The regulator is made of boron nitride after heat treatment, and then combined with wood cellulose liquid stirring and additive blending ball milling. Through the co-matching and improvement of the raw materials, and the use of specific wood cellulose, calcium sulfate whiskers and silicon carbide fibers and sodium dodecylbenzene sulfonate solution for blending and coordination, and at the same time, specific bismuth titanate, lanthanum oxide and sodium silicate are used to make additives, the prepared regulator further enhances the performance coordination and performance stability of the system in the system through the co-matching and improvement of the raw materials and the mutual blending and synergy.

[0026] The present invention also provides a method for preparing the above-mentioned frost-resistant concrete with a large amount of solid waste, which comprises the following steps:

[0027] S: Add cement, fly ash, slag, desulfurized gypsum, mineral powder, fine aggregate, coarse aggregate and regulator into the mixer, stir dry for a while and then add water and stir until the mixture is uniform.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The high-volume solid waste frost-resistant concrete of the present invention uses a relatively low cement content, allowing materials with pozzolanic activity, such as fly ash, slag, desulfurized gypsum, and slag, to fully react. Furthermore, as the amount of fly ash replaced by slag powder increases, more dense C-(A)-SH gel structures are formed inside the cementitious material, thereby optimizing the pore structure of the low-carbon concrete and effectively enhancing the frost resistance of the low-carbon concrete. This is particularly true in extremely cold environments, effectively delaying the generation and expansion of cracks and thereby improving the long-term service performance of the material. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: A large amount of solid waste antifreeze concrete is prepared by mixing the following raw materials in parts by weight: cement 165kg / m 3 、Fly ash 231kg / m 3 、Slag 82.5kg / m 3 , desulfurization gypsum 16.5kg / m 3 、Mineral powder 55kg / m 3 , water 143kg / m 3 , fine aggregate 725kg / m 3 , coarse aggregate 1000kg / m 3 and regulator 5kg / m 3 .

[0032] Example 2: A large amount of solid waste antifreeze concrete is prepared by mixing the following raw materials in parts by weight: cement 165kg / m 3 、Fly ash 203.5kg / m 3 、Slag 82.5kg / m 3 , desulfurization gypsum 16.5kg / m 3 、Mineral powder 82.5kg / m 3 , water 143kg / m 3 , fine aggregate 725kg / m 3 , coarse aggregate 1000kg / m 3and regulator 8kg / m 3 .

[0033] Example 3: A large amount of solid waste antifreeze concrete is prepared by mixing the following raw materials in parts by weight: cement 165kg / m 3 、Fly ash 176kg / m 3 、Slag 82.5kg / m 3 , desulfurization gypsum 16.5kg / m 3 、Mineral powder 110kg / m 3 , water 143kg / m 3 , fine aggregate 725kg / m 3 , coarse aggregate 1000kg / m 3 and regulator 7.5kg / m 3 .

[0034] Comparative Example: A large amount of solid waste antifreeze concrete is made by mixing the following raw materials in parts by weight: cement 165kg / m 3 、Fly ash 286kg / m 3 、Slag 82.5kg / m 3 , desulfurization gypsum 16.5kg / m 3 、Mineral powder 0kg / m 3 , water 143kg / m 3 , fine aggregate 725kg / m 3 , coarse aggregate 1000kg / m 3 and regulator 5.5kg / m 3 .

[0035] The fine aggregate, coarse aggregate, slag and desulfurized gypsum in the above Examples 1-3 and the comparative example are all processed by the following steps:

[0036] The fine aggregate is river sand, and the river sand treatment process is as follows: (1) Water washing: Use a high-pressure water gun to wash the river sand, with a water pressure of not less than 0.5 MPa and a continuous washing time of ≥30 minutes to remove clay and organic matter attached to the surface;

[0037] (2) Drying: Place the washed river sand in a ventilated and dry environment, control the ambient temperature to 30°C and the relative humidity to ≤60%, and dry it to a moisture content of ≤0.5%;

[0038] (3) Screening treatment: The dried river sand is passed through a 4.75 mm square hole sieve. After screening, particles with a particle size of ≤4.75 mm are retained, and the fineness modulus is controlled within the range of 2.45.

[0039] The coarse aggregate is crushed stone. The crushed stone used in the test should be washed with water for 24 hours and then dried to obtain the standard crushed stone used in the test. The coarse aggregate meets the continuous grading requirements, with 6mm accounting for 42%, 10mm accounting for 28%, 15mm accounting for 16%, and 17mm accounting for 14%.

[0040] The method for treating slag and desulfurized gypsum comprises the following steps:

[0041] (1) Drying treatment: Place the slag and desulfurized gypsum in an oven separately and dry them at a constant temperature of 115±5°C until the moisture content is ≤0.3%. The drying time is ≥4 hours for slag and ≥2 hours for desulfurized gypsum;

[0042] (2) Screening treatment:

[0043] The dried slag passes through a 0.3mm square hole sieve, and after screening, particles with a particle size of ≤0.3mm are retained, and the particle gradation meets the following requirements: particles with a particle size of ≤0.15mm account for ≤20%, and particles with a size of 0.20mm account for ≥80%; the desulfurized gypsum passes through a 190 mesh standard sieve (pore size of about 0.075mm), and after screening, particles with a particle size of ≤0.075mm are retained, and the specific surface area is ≥450m 2 / kg.

[0044] The specific preparation method of the regulator is:

[0045] S1: heat-treating the boron nitride at 158°C for 1 hour, then heating to 220°C at a rate of 3.5°C / min, holding the temperature for 20 minutes, and then air-cooling to room temperature to obtain heat-treated boron nitride;

[0046] S2: Blending lignocellulose, calcium sulfate whiskers, silicon carbide fibers, and sodium dodecylbenzenesulfonate solution in a weight ratio of 4:2.5:6:13 to obtain a lignocellulose solution;

[0047] 2.5 parts of bismuth titanate, 1.5 parts of lanthanum oxide and 4 parts of sodium silicate are thoroughly mixed to obtain an additive;

[0048] S3: stirring the heat-treated boron nitride and the lignocellulose liquid in a weight ratio of 3:5, and completing the stirring to obtain a lignocellulose-conditioned boron nitride agent;

[0049] The boron nitride agent for wood fiber conditioning and the additive are fully blended and ball-milled in a weight ratio of 7:5. After the ball milling is completed, the mixture is filtered and dried to obtain a conditioning agent. The mass fraction of the sodium dodecylbenzenesulfonate solution is 6.5%. The stirring speed of the stirring treatment is 600 r / min, and the stirring is carried out for 1 hour. The ball milling speed of the blending is fully ball-milled at 1250 r / min, and the ball milling is carried out for 2 hours.

[0050] The low carbon concrete mix ratios in the above Examples 1-3 and Comparative Examples are as follows:

[0051]

[0052] The above raw materials are mixed according to the ratio to prepare low-carbon concrete, which includes the following steps:

[0053] Mix cement, fly ash, slag, desulfurized gypsum, mineral powder and aggregate dry material and regulator evenly, stir for 1 minute, then add water and stir thoroughly with a concrete mixer until the mixture is uniform.

[0054] The coarse aggregate in the table is crushed stone, and the fine aggregate is river sand. River sand must pass a 4.75mm square mesh sieve. The coarse aggregate meets continuous grading requirements, with 4.75mm-9.5mm accounting for 42%, 9.5mm-13.2mm accounting for 28%, 13.2mm-16mm accounting for 16%, and 16mm-19mm accounting for 14%. The slag in the cementitious material should pass a 0.3mm square mesh sieve, and the desulfurized gypsum should pass a 190-mesh sieve.

[0055] Pour the concrete prepared in Examples 1 to 3 and the comparative example into a pre-prepared mold, ensure uniform filling, and vibrate on a vibration table to eliminate bubbles and ensure that the interior of the specimen is dense. Use a spatula to smooth the mixture on the surface of the mold to ensure that the surface of the specimen is smooth and flat, and demold after 1 day. Carefully transfer the demolded concrete specimen to the curing room and place it on an appropriate bracket to ensure that the specimen is not subjected to uneven force. During the curing process, regularly check the temperature and humidity in the curing room to ensure that they meet the set standard curing conditions. The curing temperature is 21-23°C and the humidity is 95-97°C.

[0056] The test pieces obtained from Examples 1 to 3 and the comparative example were subjected to analytical tests on water freezing, mass loss rate, dynamic elastic modulus, and compressive strength:

[0057] After testing, it can be seen from the mass loss rate data that in the water freezing test, with the increase of the number of freeze-thaw cycles, the mass loss rate of all mix ratios gradually increases.

[0058] Comparative example: The mass loss rate of K0 (no mineral powder addition) increased most significantly, and the mass loss rate after 250 freeze-thaw cycles was 5.23%, indicating that the low-carbon concrete without mineral powder addition had the worst frost resistance and severe surface peeling.

[0059] In contrast, with the increase of mineral powder content (K10, K15, K20), the mass loss rate shows a change pattern of first decreasing and then increasing. The mass loss rate of K10 after 300 freeze-thaw cycles is 5.19%, and the mass loss rate of K15 after 300 freeze-thaw cycles is 4.94%. In comparison, the mass loss rate of K20 after 275 freeze-thaw cycles is 5.46%. The mass loss rate increases, and the number of freeze-thaw cycles is only 275 times, which is only 25 times more than K0 and 25 times less than K10, showing poor frost resistance. This shows that a higher mineral powder content weakens the frost resistance of low-carbon concrete, and the surface peeling is more serious.

[0060] Secondly, the dynamic elastic modulus data show that in the freeze-thaw test, the dynamic elastic modulus of the mix ratios with different mineral powder content shows a trend of decreasing with the increase of freeze-thaw cycles. The mix ratio K0 (0% mineral powder) changes from the initial value of about 38.1×10 3 MPa dropped to about 15.4×10 3 MPa, and lost about 59.6% of the dynamic elastic modulus. K10 (10% mineral powder) from the initial about 41.6×10 3 MPa dropped to about 20.9×10 3 MPa, and lost about 49.8% of the dynamic elastic modulus. In comparison, it can be found that adding a proper amount of mineral powder can reduce the loss of dynamic elastic modulus. The dynamic elastic modulus of the mix ratio K15 (15% mineral powder) increased from about 41.8×10 3 MPa dropped to about 21.6×10 3 MPa, decreased by about 48.3%, while the dynamic elastic modulus of mix ratio K20 (20% mineral powder) decreased from about 43.8×10 3 MPa dropped to about 22.9×10 3 MPa, a decrease of about 47.7%. The core mechanism lies in the synergistic effect of CaO ≥ 35% in mineral powder and SiO2 + Al2O3 ≥ 80% in fly ash, combined with the particle grading filling of mineral powder (D50 ≤ 15 μm) and fly ash (D50 ≤ 5 μm), which reduces the porosity of cementitious materials and significantly delays freeze-thaw damage. However, since the mass loss rate of this mix ratio has exceeded 5%, indicating that the freeze-thaw cycle has ended, this also shows that with the increase of mineral powder content, its antifreeze performance first increases and then decreases.

[0061] The test data of compressive strength during the whole process of freeze-thaw cycle show that in the freeze-thaw test, the mix ratio of different mineral powder dosages shows a trend of decreasing compressive strength as the number of freeze-thaw cycles increases. 3 ) decreased from the initial 23.4 MPa to about 5.7×10 3MPa, and when the freeze-thaw cycle reaches 175 times, the compressive strength of the concrete specimen can no longer be measured, indicating that as the freeze-thaw cycle proceeds, the bearing capacity of the low-carbon concrete without mineral powder has been lost. 3 ) dropped from the initial 45.7 MPa to 4.7 MPa after 250 freeze-thaw cycles. In comparison, it was found that adding mineral powder in appropriate amounts could increase the compressive strength of low-carbon concrete and its bearing capacity after freeze-thaw cycles. The mix ratio K15 (82.5 kg / m 3 ) decreased from the initial 61.2 MPa to 6.8 MPa after 300 freeze-thaw cycles, while the mix ratio K20 (110 kg / m 3 ) decreased from an initial 56.5 MPa to 4.2 MPa after 250 freeze-thaw cycles. It can be seen that although K20 has a higher initial compressive strength, the bearing capacity of concrete decreases significantly under the influence of the freeze-thaw environment. In contrast, the bearing capacity of K15 concrete remains good. This also shows that with the increase in mineral powder content, the bearing capacity of low-carbon concrete during freeze-thaw cycles first increases and then decreases, that is, the frost resistance of concrete first increases and then decreases.

[0062] In general, as the mineral powder content continues to increase, the mass loss, dynamic elastic modulus, and compressive strength of low-carbon concrete during freeze-thaw cycles all meet the requirement of first decreasing and then increasing, that is, the frost resistance first increases and then decreases. Overall, K15 has the strongest frost resistance.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0064] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-volume solid waste frost-resistant concrete, characterized in that: Calculated by mass, Includes the following components:

2. The high-volume solid waste frost-resistant concrete according to claim 1, characterized in that: The fine aggregate is river sand, and the river sand treatment process is as follows: (1) water washing: the river sand is washed with a high-pressure water gun at a water pressure of not less than 0.5 MPa for a continuous washing time of ≥30 minutes to remove clay and organic matter attached to the surface; (2) Drying: Place the washed river sand in a ventilated and dry environment, control the ambient temperature to 25-35°C and the relative humidity to ≤60%, and dry it to a moisture content of ≤0.5%; (3) Screening treatment: The dried river sand is passed through a 4.75 mm square hole sieve. After screening, particles with a particle size of ≤4.75 mm are retained, and the fineness modulus is controlled within the range of 2.3-2.

6.

3. The high-volume solid waste frost-resistant concrete according to claim 1, characterized in that: The method for treating slag and desulfurized gypsum comprises the following steps: (1) Drying treatment: Place the slag and desulfurized gypsum in an oven separately and dry them at a constant temperature of 115±5°C until the moisture content is ≤0.3%. The drying time is ≥4 hours for slag and ≥2 hours for desulfurized gypsum; (2) Screening treatment: The dried slag passes through a 0.3mm square hole sieve, and after screening, particles with a particle size of ≤0.3mm are retained, and the particle gradation meets the following requirements: particles with a particle size of ≤0.15mm account for ≤20%, and particles with a size of 0.15-0.3mm account for ≥80%; the desulfurized gypsum passes through a 190 mesh standard sieve (pore size of about 0.075mm), and after screening, particles with a particle size of ≤0.075mm are retained, and the specific surface area is ≥450m 2 / kg.

4. The high-volume solid waste frost-resistant concrete according to claim 1, characterized in that: The coarse aggregate is crushed stone. The crushed stone used in the test should be washed with water for 24 hours and then dried to obtain the standard crushed stone used in the test. The coarse aggregate meets the continuous grading requirements, with 4.75mm-9.5mm accounting for 42%, 9.5mm-13.2mm accounting for 28%, 13.2mm-16mm accounting for 16%, and 16mm-19mm accounting for 14%.

5. The high-volume solid waste frost-resistant concrete according to claim 1, characterized in that: 5-8 parts of a regulator are also added to the antifreeze concrete. The specific preparation method of the regulator is as follows: S1: heat treating the boron nitride at 155-160°C for 1 hour, then heating to 220°C at a rate of 2-5°C / min, holding the temperature for 20 minutes, and then air cooling to room temperature to obtain heat-treated boron nitride; S2: Blending lignocellulose, calcium sulfate whiskers, silicon carbide fibers, and sodium dodecylbenzenesulfonate solution in a weight ratio of (3-5):(2-3):(5-7):13 to obtain a lignocellulose solution; 2-3 parts of bismuth titanate, 1-2 parts of lanthanum oxide and 3-5 parts of sodium silicate are fully mixed to obtain an additive; S3: stirring the heat-treated boron nitride and the lignocellulose liquid in a weight ratio of 3:5, and completing the stirring to obtain a lignocellulose-conditioned boron nitride agent; The boron nitride agent for wood fiber conditioning and the additive are mixed and ball-milled in a weight ratio of 7:

5. After the ball-milling is completed, the mixture is filtered and dried to obtain a conditioning agent.

6. The high-volume solid waste frost-resistant concrete according to claim 5, characterized in that: The mass fraction of the sodium dodecylbenzenesulfonate solution is 5-8%.

7. The frost-resistant concrete with a large amount of solid waste according to claim 5, characterized in that: The stirring speed of the stirring treatment is 550-750 r / min, and the stirring is for 1 hour; the ball milling speed of the blending is 1000-1500 r / min, and the ball milling is for 2 hours.

8. A method for preparing frost-resistant concrete with a large amount of solid waste according to claim 1, characterized in that: The steps include: S: Add cement, fly ash, slag, desulfurized gypsum, mineral powder, fine aggregate, coarse aggregate and regulator into the mixer, stir dry for a while and then add water and stir until the mixture is uniform.

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