Novel flow-state solidified soil and preparation method thereof

Abstract

The invention relates to the field of building materials, and provides novel flow-state solidified soil which comprises the following raw materials in parts by weight: 75-95 parts of waste engineering residue soil and 5-25 parts of a micro-nano soil solidifying agent, wherein the micro-nano soil stabilizer is powder and is prepared from the following raw materials in parts by weight: 5 to 10 parts of Portland cement, 40 to 50 parts of mineral powder, 60 to 90 parts of biological-solid waste based composite clinker and 2 to 3 parts of modified polycarboxylic acid powder water reducing agent. The invention also provides a preparation method of the fluid solidified soil. According to the flow-state solidified soil, the waste engineering residue soil and the micro-nano soil solidifying agent serve as main raw materials, and the finally obtained material has the advantages of being large in fluidity, small in shrinkage rate and not prone to cracking.

Description

Technical Field

[0001] The present invention relates to the field of building materials, and particularly to a new type of fluidized solidified soil and a preparation method thereof. Background Art

[0002] When facing the situation of narrow backfill space for foundation pits, complex types of underground utility tunnels, and multiple small and independent backfill sections on the construction surface, due to the narrow construction site space, large construction machines cannot be used for construction, and only manual compaction can be adopted, resulting in low construction efficiency and insufficient compactness of the backfill soil. Therefore, it is necessary to use fluidized solidified soil for construction in engineering.

[0003] Fluidized solidified soil is a self-leveling filling material prepared by taking the original soil at the construction site and a curing agent as the main raw materials and uniformly mixing them with water. Compared with traditional manual backfill construction, fluidized solidified soil has the characteristics of high fluidity, self-hardening, no need for rolling forming, high construction efficiency, adjustable density and strength, etc. However, since the main raw material of fluidized solidified soil is soil, which has characteristics such as high viscosity and strong adsorption ability, in order to obtain fluidized solidified soil with good fluidity, the mixing water consumption far exceeds the water consumption required by the curing agent, which further causes problems such as large shrinkage rate and easy cracking during the drying process of fluidized solidified soil, seriously affecting the project quality.

[0004] Therefore, how to provide a fluidized solidified soil with large fluidity, small shrinkage rate and not easy to crack and its preparation method is an urgent problem to be solved at present. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a new type of fluidized solidified soil with large fluidity, small shrinkage rate and not easy to crack and a preparation method thereof.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A new type of fluidized solidified soil and a preparation method thereof, comprising the following raw materials in parts by weight: 75 - 95 parts of waste engineering soil, 5 - 25 parts of micro-nano soil curing agent; wherein, the micro-nano soil curing agent is a powder, and comprises the following raw materials in parts by weight: 5 - 10 parts of portland cement, 40 - 50 parts of mineral powder, 60 - 90 parts of bio-solid waste-based composite clinker, 2 - 3 parts of modified polycarboxylic acid powder water reducer.

[0008] As one of the preferred embodiments of the present invention, the waste engineering soil is the waste soil generated during the excavation of building construction.

[0009] As one of the preferred embodiments of the present invention, the portland cement is at least one of 42.5 grade portland cement and 52.5 grade portland cement.

[0010] As one of the preferred embodiments of the present invention, the mineral powder is at least one of S95 mineral powder and S105 mineral powder.

[0011] As one of the preferred embodiments of the present invention, the bio-solid waste-based composite clinker is composited from crop straw and industrial solid waste as an inorganic base activator.

[0012] As one of the preferred embodiments of the present invention, the crop straw is at least one of corn straw, rice straw and wheat straw.

[0013] As one of the preferred embodiments of the present invention, the industrial solid waste is at least one of phosphogypsum, carbide slag and red mud.

[0014] As one of the preferred embodiments of the present invention, the specific preparation method of the bio-solid waste-based composite clinker is: crushing crop straw into a length of 1 to 5 mm; mixing the crushed crop straw with industrial solid waste in a weight ratio of 1: (1 to 3); placing the mixture in a high-temperature furnace at 800°C and calcining for 1 hour, and then cooling to room temperature.

[0015] As one of the preferred embodiments of the present invention, the specific preparation method of the modified powdered polycarboxylate water reducer is:

[0016] (1) dissolving lignin in a dioxane solution, then adding sulfuric acid to make the solution acidic; heating to 70-80° C., slowly adding dimethyl sulfate dropwise, and maintaining the temperature at 60-70° C.; after the methylation reaction is completed, adjusting the pH to neutral, washing, and drying to obtain modified lignin;

[0017] (2) heating polyethylene glycol and maleic anhydride in toluene to 100-120° C., adding a ferrous sulfate catalyst, and performing an esterification reaction at 100-120° C. for 4-6 hours; after the reaction, adding ethylene glycol to react; after the reaction, obtaining monomer A by distillation;

[0018] (3) The modified lignin, monomer A and polycarboxylic acid water reducer are mixed together, heated to 50-60° C., sodium methyl methacrylate sulfonate and polyoxyethylene ether are added in sequence, and reacted at 80-90° C. for 5-6 hours under nitrogen protection; after the reaction, the pH is adjusted to neutral, filtered, and dried to obtain a modified polycarboxylic acid powder water reducer.

[0019] As one of the preferred embodiments of the present invention, the preparation method of the micro-nano soil solidifier is as follows: after mixing silicate cement, inorganic alkali activator, mineral powder, and modified polycarboxylic acid powder water reducer, the mixture is ultra-finely ground to make the specific surface area of the ground solidifier ≥750kg / m 2 .

[0020] A method for preparing the novel fluidized solidified soil comprises the following steps:

[0021] (1) Prepare each raw material according to the corresponding weight parts.

[0022] (2) Add water to the waste engineering muck and stir until it becomes a slurry.

[0023] (3) Add the micro-nano soil stabilizer to the slurry in step (2), and continue to add water and stir evenly.

[0024] Among them, the weight ratio between the total amount of water used and the waste engineering muck is 1.1:1.

[0025] The advantages of the present invention compared with the prior art are as follows:

[0026] (1) The fluidized solidified soil of the present invention uses waste engineering muck (soil material, containing minerals) and micro-nano soil stabilizer as the main raw materials; among them, the soil stabilizer is composed of portland cement, mineral powder, bio-solid waste-based composite clinker, and modified polycarboxylate powder water reducer, and finally undergoes ultrafine grinding; on the one hand, by adding a water reducer, the overall water consumption is reduced, avoiding problems such as large shrinkage rate and easy cracking caused by high water consumption; at the same time, crop straw and industrial solid waste are calcined at high temperature in combination, mainly forming calcium silicate aluminate minerals, and a small amount of partial biomass ash (alkaline type) is formed, which can effectively improve the composition of the soil and increase the strength of the solidified soil material, making it not easy to crack; on the other hand, through the ultrafine grinding of the stabilizer, it can be efficiently adsorbed on the surface of the muck particles, improving the hydrophobicity of the minerals, weakening their water adsorption capacity, making the bound water film thinner, releasing free water, reducing the friction and adhesion between soil particles, and further improving the fluidity of the fluidized solidified soil material; at the same time, after the stabilizer is ultrafinely ground, the specific surface area and specific surface energy of the stabilizer powder particles increase, and during the hydration process, more reaction nucleation points can be provided, making the hydration reaction more sufficient, and improving the stability and strength of the solidified soil.

[0027] (2) The water reducer of the present invention is a modified polycarboxylate powder water reducer; compared with the traditional water reducer, the modified polycarboxylate powder water reducer of the present invention can effectively improve the electro-negativity of the surface of the soil particles, make the layered structure between the soil particles more dense, thereby reducing the adsorption of the soil to the water reducer, fully releasing the water reduction rate of the powder water reducer, and improving the fluidity of the solidified soil.

[0028] (3) The present invention can recycle a large amount of waste engineering muck, further solving the problem of difficult treatment of waste engineering muck. Specific embodiments

[0029] The embodiments of the present invention will be described in detail below. These embodiments are implemented on the premise of the technical solution of the present invention, and the detailed implementation methods and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments. At the same time, the raw materials used in the present invention are all conventional raw material reagents in the art without special description. The experimental conditions and experimental methods used in the present invention are all conventional conditions and methods in the art without special description, and will not be elaborated here.

[0030] Example 1

[0031] A kind of fluid-solidified soil in this embodiment includes the following raw materials in parts by weight: 75 parts of waste engineering muck and 5 parts of micro-nano soil solidifying agent.

[0032] In this embodiment, the waste engineering muck is the waste soil generated during the excavation of building construction.

[0033] The micro-nano soil solidifying agent is a powder, and includes the following raw materials in parts by weight: 5 parts of 42.5-grade Portland cement, 40 parts of S105 slag powder, 60 parts of bio-solid waste-based composite clinker (inorganic alkali activator), and 2 parts of modified polycarboxylate powder water reducer. Among them, the bio-solid waste-based composite clinker is composed of corn straw and industrial solid waste-phosphogypsum.

[0034] The preparation method of the fluid-solidified soil in this embodiment:

[0035] (1) Prepare bio-solid waste-based composite clinker

[0036] ① Crush the corn straw into a length of 1 mm;

[0037] ② Mix the crushed corn straw with industrial solid waste in a weight ratio of 1:1;

[0038] ③ Put the mixture into a high-temperature furnace at 800 °C and calcine for 1 h, and then cool it to room temperature to obtain bio-solid waste-based composite clinker as an inorganic alkali activator.

[0039] (2) Prepare modified polycarboxylate powder water reducer

[0040] Dissolve 20 g of lignin in 100 ml of dioxane solution, then add sulfuric acid to make the solution acidic; heat to 70 °C, slowly dropwise add dimethyl sulfate, and keep the temperature at 60 °C; after the methylation reaction is completed, adjust the pH to neutral, wash, and dry to obtain modified lignin;

[0041] Heat 30 g of polyethylene glycol and 20 g of maleic anhydride in 130 ml of toluene to 100 °C, add 0.8 g of ferrous sulfate catalyst, and carry out esterification reaction at 100 °C for 4 h; after the reaction is completed, add ethylene glycol for reaction; after the reaction is completed, obtain monomer A by distillation;

[0042] Mix 70 g of modified lignin, 10 g of monomer A, and 100 g of polycarboxylate water reducer together, heat to 50 °C, add 1 g of sodium methallylsulfonate and 1 g of polyoxyethylene ether in sequence, and react at 80 °C for 5 h under nitrogen protection; after the reaction, adjust the pH to neutral, filter, and dry to obtain the modified polycarboxylate powder water reducer.

[0043] (3) Preparation of micro-nano soil solidifying agent

[0044] Mix portland cement, bio-solid waste-based composite clinker, mineral powder, and modified polycarboxylate powder water reducer, and perform ultrafine grinding on the mixture to make the specific surface area of the solidifying agent after grinding ≥ 750 kg / m 2 , to obtain the micro-nano soil solidifying agent.

[0045] (4) Preparation of fluidized solidified soil

[0046] Weigh the waste engineering soil and the micro-nano soil solidifying agent according to the corresponding weight parts; add water to the waste engineering soil and stir until it becomes a slurry; then, add the micro-nano soil solidifying agent to the slurry and continue to add water and stir evenly. Among them, the weight ratio between the total amount of water used and the waste engineering soil is 1.1:1, and when adding water for the first time, 80% is added, and the remaining 20% is added for the second time.

[0047] Example 2

[0048] A fluidized solidified soil in this example includes the following raw materials in weight parts: 85 parts of waste engineering soil and 15 parts of micro-nano soil solidifying agent.

[0049] In this example, the waste engineering soil is the waste soil generated during the excavation of building construction.

[0050] The micro-nano soil solidifying agent is in powder form and includes the following raw materials in weight parts: 8 parts of 52.5-grade portland cement, 45 parts of S95 mineral powder, 75 parts of bio-solid waste-based composite clinker (inorganic alkali activator), and 2.5 parts of modified polycarboxylate powder water reducer. Among them, the bio-solid waste-based composite clinker is composed of rice straw and industrial solid waste - carbide slag.

[0051] The preparation method of the fluidized solidified soil in this example:

[0052] (1) Preparation of bio-solid waste-based composite clinker

[0053] ① Crush the rice straw into a length of 2 mm;

[0054] ② Mix the crushed rice straw with the industrial solid waste in a weight ratio of 1:2;

[0055] ③Put the mixture into a high-temperature furnace at 800 °C and calcine it for 1 h, then cool it to room temperature to obtain the bio-solid waste-based composite clinker, which is used as an inorganic alkali activator.

[0056] (2) Preparation of modified polycarboxylic acid powder water reducer

[0057] Dissolve 25 g of lignin in 120 ml of dioxane solution, then add sulfuric acid to make the solution acidic; heat to 75 °C, slowly dropwise add dimethyl sulfate, and keep the temperature at 65 °C; after the methylation reaction is completed, adjust the pH to neutral, wash, and dry to obtain modified lignin;

[0058] Heat 35 g of polyethylene glycol and 25 g of maleic anhydride in 150 ml of toluene to 110 °C, add 0.9 g of ferrous sulfate catalyst, and carry out esterification reaction at 110 °C for 5 h; after the reaction is completed, add ethylene glycol for reaction; after the reaction is completed, obtain monomer A by distillation;

[0059] Mix 75 g of modified lignin, 15 g of monomer A, and 150 g of polycarboxylic acid water reducer together, heat to 55 °C, and successively add 3 g of sodium methallylsulfonate and 3 g of polyoxyethylene ether. Under nitrogen protection, react at 85 °C for 5.5 h; after the reaction is completed, adjust the pH to neutral, filter, and dry to obtain the modified polycarboxylic acid powder water reducer.

[0060] (3) Preparation of micro-nano soil stabilizer

[0061] Mix portland cement, bio-solid waste-based composite clinker, mineral powder, and modified polycarboxylic acid powder water reducer, and carry out ultra-fine grinding on the mixture so that the specific surface area of the ground stabilizer is ≥ 750 kg / m 2 , to obtain the micro-nano soil stabilizer.

[0062] (4) Preparation of fluidized solidified soil

[0063] Weigh the waste engineering soil and the micro-nano soil stabilizer according to the corresponding weight parts; add water to the waste engineering soil and stir until it becomes muddy; then, add the micro-nano soil stabilizer to the mud and continue to add water and stir evenly. Among them, the weight ratio between the total amount of water used and the waste engineering soil is 1.1:1, and when adding water for the first time, 80% is added, and 20% of the remaining is added for the second time.

[0064] Example 3

[0065] A kind of fluidized solidified soil in this example includes the following raw materials in weight parts: 95 parts of waste engineering soil and 25 parts of micro-nano soil stabilizer.

[0066] In this example, the waste engineering soil is the waste soil generated during the excavation of building construction.

[0067] The micro-nano soil solidifying agent is in powder form and comprises the following raw materials in parts by weight: 10 parts of 42.5-grade portland cement, 50 parts of S95 blast furnace slag powder, 90 parts of bio-solid waste-based composite clinker (inorganic alkali activator), and 3 parts of modified polycarboxylic acid powder water reducer. Among them, the bio-solid waste-based composite clinker is composed of wheat straw and industrial solid waste - red mud.

[0068] The preparation method of the fluidized solidified soil in this embodiment:

[0069] (1) Prepare the bio-solid waste-based composite clinker

[0070] ① Crush the wheat straw into lengths of 5 mm;

[0071] ② Mix the crushed wheat straw with industrial solid waste in a weight ratio of 1:3;

[0072] ③ Put the mixture into a high-temperature furnace at 800 °C and calcine for 1 h, then cool to room temperature to obtain the bio-solid waste-based composite clinker as the inorganic alkali activator.

[0073] (2) Prepare the modified polycarboxylic acid powder water reducer

[0074] Dissolve 30 g of lignin in 150 ml of dioxane solution, then add sulfuric acid to make the solution acidic; heat to 80 °C and slowly dropwise add dimethyl sulfate while maintaining the temperature at 70 °C; after the methylation reaction ends, adjust the pH to neutral, wash, and dry to obtain modified lignin;

[0075] Heat 40 g of polyethylene glycol and 30 g of maleic anhydride in 170 ml of toluene to 120 °C, add 1 g of ferrous sulfate catalyst, and carry out an esterification reaction at 120 °C for 6 h; after the reaction ends, add ethylene glycol for reaction; after the reaction ends, obtain monomer A by distillation;

[0076] Mix 80 g of modified lignin, 20 g of monomer A, and 200 g of polycarboxylic acid water reducer together, heat to 60 °C, and successively add 5 g of sodium methallylsulfonate and 5 g of polyethylene oxide ether, and react at 90 °C for 6 h under nitrogen protection; after the reaction ends, adjust the pH to neutral, filter, and dry to obtain the modified polycarboxylic acid powder water reducer.

[0077] (3) Prepare the micro-nano soil solidifying agent

[0078] Mix the portland cement, bio-solid waste-based composite clinker, blast furnace slag powder, and modified polycarboxylic acid powder water reducer, and carry out ultrafine grinding on the mixture so that the specific surface area of the solidifying agent after grinding is ≥ 750 kg / m 2 , to obtain the micro-nano soil solidifying agent.

[0079] (4) Prepare the fluidized solidified soil

[0080] Weigh the waste construction soil and the micro-nano soil stabilizer according to the corresponding parts by weight; add water to the waste construction soil and stir until it becomes a slurry; then, add the micro-nano soil stabilizer to the slurry and continue to add water, and stir evenly. Among them, the weight ratio between the total amount of water used and the waste construction soil is 1.1:1, and when adding water for the first time, 80% is added, and the remaining 20% is added for the second time.

[0081] Comparative Example 1

[0082] A kind of fluidized solidified soil in this comparative example is basically the same as that in Example 2. The main difference is that the soil stabilizer uses the same raw material formula but is not subjected to ultra-fine grinding treatment.

[0083] Comparative Example 2

[0084] A kind of fluidized solidified soil in this comparative example is basically the same as that in Example 2. The main difference is that in the composition of the soil stabilizer, the traditional "inorganic alkali activator (quicklime)" is used instead of the "bio-solid waste-based composite clinker".

[0085] Comparative Example 3

[0086] A kind of fluidized solidified soil in this comparative example is basically the same as that in Example 2. The main difference is that in the composition of the soil stabilizer, the "modified polycarboxylic acid powder water reducer" is not added.

[0087] Comparative Example 4

[0088] A kind of fluidized solidified soil in this comparative example is basically the same as that in Example 2. The main difference is that the weight ratio between the total amount of water used and the waste construction soil is 0.8:1.

[0089] Experimental Example

[0090] This experimental example is used to verify the application advantages of the fluidized solidified soil of the present invention.

[0091] Test the initial spread (corresponding to fluidity) and 28-day compressive strength of the fluidized solidified soil prepared in Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention according to the corresponding requirements of the "Technical Standard for Filling with Premixed Fluidized Solidified Soil" T / CEWCS-2022. At the same time, test the shrinkage rate and volume stability (whether it cracks) according to the following method:

[0092] The size of the test specimen is 70×70×70 mm. After the specimen is molded and cured for 1 day, it is demolded. After demolding, use a vernier caliper to measure its initial length (length, width, and height), and calculate the initial volume. Continue to cure until the age of 28 days, measure and calculate the volume of the specimen at the age of 28 days. The shrinkage volume change rate of the specimen is calculated as [(initial volume - volume at 28 days of age) / initial volume]×100%. At the same time, observe whether its surface cracks 2 days after demolding.

[0093] The final test results are shown in Table 1.

[0094] Table 1 Test results of solidified soil in each example and comparative example

[0095]

[0096] From the above results, it can be seen that:

[0097] (1) The fluid-solidified soil of the present invention has a relatively high spread, reaching 280 mm to 350 mm, a relatively low shrinkage rate, only 0.02% to 0.06%, and the 28-day compressive strength is 1.9 to 3.3 MPa; and no surface cracking occurs.

[0098] (2) Compared with Example 2, Comparative Example 1 has significantly lower spread and 28-day compressive strength, higher shrinkage rate, and surface cracks appear; it shows that after the curing agent passes through ultrafine powder, it can improve the spread (fluidity) and strength of the solidified soil, reduce the shrinkage rate, and improve the volume stability.

[0099] (3) Compared with Example 2, Comparative Example 2 has significantly lower spread and 28-day compressive strength, higher shrinkage rate, and surface cracks appear; it shows that using traditional alkaline activators cannot achieve the effect of bio-solid waste-based composite clinker.

[0100] (4) Compared with Example 2, Comparative Example 3 has significantly lower spread and 28-day compressive strength, higher shrinkage rate, and surface cracks appear; it shows that after not adding the modified polycarboxylic acid powder water reducer of the present invention, it can significantly affect the spread (fluidity), shrinkage rate and strength of the fluid-solidified soil.

[0101] (5) Compared with Example 2, the difference in spread of Comparative Example 4 is smaller than that of Comparative Examples 1 to 3, and its shrinkage rate and 28-day compressive strength are higher than those of Example 2; it shows that adding the modified polycarboxylic acid powder water reducer can significantly improve the spread (fluidity) of the solidified soil, reduce the water consumption, and improve the strength and reduce the shrinkage rate.

[0102] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of fluid-solidified soil, characterized in that, It includes raw materials in the following parts by weight: 75 - 95 parts of waste engineering soil, and 5 - 25 parts of micro-nano soil solidifying agent; among them, the micro-nano soil solidifying agent is in powder form and includes raw materials in the following parts by weight: 5 - 10 parts of portland cement, 40 - 50 parts of mineral powder, 60 - 90 parts of bio-solid waste-based composite clinker, and 2 - 3 parts of modified polycarboxylate powder water reducer.

2. The novel fluid-solidified soil according to claim 1, wherein, The portland cement is at least one of 42.5-grade portland cement and 52.5-grade portland cement.

3. The novel flowable solidified soil according to claim 1, characterized in that, The mineral powder is at least one of S95 mineral powder and S105 mineral powder.

4. The novel fluid-solidified soil according to claim 1, characterized in that, The bio-solid waste-based composite clinker is composed of crop straw and industrial solid waste and serves as an inorganic alkali activator.

5. The novel flowable solidified soil according to claim 4, characterized in that, The crop straw is at least one of corn straw, rice straw, and wheat straw.

6. The novel flowable solidified soil according to claim 4, characterized in that, The industrial solid waste is at least one of phosphogypsum, carbide slag, and red mud.

7. The novel flowable solidified soil according to claim 4, wherein The specific preparation method of the bio-solid waste-based composite clinker is: crushing the crop straw into lengths of 1 - 5 mm; mixing the crushed crop straw and industrial solid waste in a weight ratio of 1:(1 - 3); putting the mixture into a high-temperature furnace at 800 °C and calcining for 1 h, and then cooling to room temperature.

8. The novel fluid-solidified soil according to claim 1, wherein The specific preparation method of the modified polycarboxylate powder water reducer is as follows: (1) Dissolve lignin in dioxane solution, then add sulfuric acid to make the solution acidic; heat to 70 - 80 °C, slowly dropwise add dimethyl sulfate, and keep the temperature at 60 - 70 °C; after the methylation reaction ends, adjust the pH to neutral, wash, and dry to obtain modified lignin; (2) Heat polyethylene glycol and maleic anhydride in toluene to 100 - 120 °C, add a ferrous sulfate-based catalyst, and carry out an esterification reaction at 100 - 120 °C for 4 - 6 h; after the reaction ends, add ethylene glycol for reaction; after the reaction ends, obtain monomer A by distillation; (3) Mix the modified lignin, monomer A, and polycarboxylate water reducer together, heat to 50 - 60 °C, sequentially add sodium methallylsulfonate and polyethylene oxide ether, and react at 80 - 90 °C for 5 - 6 h under nitrogen protection; after the reaction ends, adjust the pH to neutral, filter, and dry to obtain the modified polycarboxylate powder water reducer.

9. The novel flowable solidified soil according to claim 1, wherein, The preparation method of the micro-nano soil stabilizer is as follows: Mix portland cement, inorganic alkali activator, mineral powder, and modified polycarboxylate powder water reducer, and then perform ultrafine grinding on the mixture so that the specific surface area of the ground stabilizer is ≥ 750 kg / m 2 .

10. A preparation method of the novel fluid-solidified soil according to any one of claims 1 to 9, characterized in that, It includes the following steps: (1) Prepare each raw material according to the corresponding parts by weight; (2) Add water to the waste engineering soil and stir until it becomes a slurry; (3) Add the micro-nano soil solidifying agent to the slurry in step (2), and continue to add water and stir evenly. Among them, the weight ratio between the total amount of water used and the waste engineering soil is 1.1:1.

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