Strength-adjustable self-toughening phosphogypsum fluidized solidified backfill material and preparation method thereof

Abstract

The application discloses a self-toughening phosphogypsum flow-state solidified backfill material with adjustable strength and a preparation method thereof, and relates to the field of road construction materials. The raw materials include modified phosphogypsum 600-1500 parts by mass, cement 40-120 parts by mass, super-sulfur cementing admixture 80-230 parts by mass, silica fume 2-8 parts by mass, quick-setting rheological agent 1-4 parts by mass, water reducing agent 5-20 parts by mass, self-toughening resin 20-30 parts by mass, complex cross-linking reinforcing agent 10-50 parts by mass, and water 100-400 parts by mass. The modified phosphogypsum is prepared after the pH value of phosphogypsum waste residue is adjusted to 6-8. The self-toughening resin is prepared by mixing cashew phenol and phenolic aldehyde at a mass ratio of 2:1. The self-toughening phosphogypsum flow-state solidified backfill material provided by the application has a setting time of less than 22 hours, and the 90-day flexural strength can reach more than 3.4 MPa. The 28-day compressive strength can be adjusted in the range of 3-25 MPa. The self-toughening phosphogypsum flow-state solidified backfill material meets the requirements of different backfill projects on the strength and fluidity of backfill materials, has excellent mechanical properties, controllable setting time, can effectively lock water during the preparation process, is not easy to segregate and secrete water, and has good water damage resistance stability after construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road construction materials, in particular to a self-toughening phosphogypsum flow-state solidification backfill material with adjustable strength. BACKGROUND

[0002] Phosphogypsum is a by-product of the wet process of manufacturing phosphoric acid, and is a solid waste produced by phosphorus chemical enterprises. According to statistics, about 4-5 tons of phosphogypsum are produced for every ton of phosphoric acid. Phosphogypsum contains harmful substances such as phosphorus, fluorine, and heavy metal ions. Its random discharge and accumulation not only pollute groundwater resources, but also waste land resources, and seriously harm the natural environment.

[0003] In recent years, with the acceleration of urbanization, China has entered a peak construction period. A large number of mine goaf backfilling and subway shield construction require grouting materials, which consume a large amount of cement-based mixed materials. Solid backfilling materials have no flowability, and it is difficult to compact the lower part of the pipe gallery and pit pipeline near the structure, and there is a large self-settling in the later period. The existing flow-state backfilling materials have low strength, high cost, and often have a large self-weight. Conventional inorganic grouting materials have high hardness, which means that they are difficult to deform plastically. When the material is subjected to external force, if the material cannot produce enough deformation, fracture will occur. If the grouting material is toughened by adding fibers, it will often affect its flowability, thereby affecting its backfilling and filling effect.

[0004] Phosphogypsum is mainly composed of calcium sulfate dihydrate. If phosphogypsum can be used in grouting backfilling materials, it can greatly save the consumption of cement materials in grouting materials. However, there are still some deficiencies in using phosphogypsum in grouting backfilling materials. For example, the strength of phosphogypsum-based materials is usually low, which limits its use; during the hardening process, there may be a retardation phenomenon, which leads to an extension of the construction time; phosphogypsum has a strong adsorption of water, and the particles are difficult to disperse in the slurry, and a large amount of water is needed to form a flowable slurry, which affects the strength of the slurry after setting; the particle size of phosphogypsum is large, and it is difficult to lock water, which leads to the problem of water bleeding and layering of the phosphogypsum slurry without stirring, greatly reducing the workability.

[0005] Many scholars have studied phosphogypsum roadbed materials. Chinese patent application CN112142431A discloses a high-content phosphogypsum stabilizing material with a skeleton system, which is characterized in that the dry base raw materials of the material include phosphogypsum 70.0-80.0wt%, gravel 1-18.0wt%, slag 3.0-7.0wt%, modifier 2.0-5.0wt%, and in addition, water accounts for 6-12% of the total amount of dry base raw material solids. Chinese patent application CN114230301A discloses a phosphogypsum hardener, which includes phosphogypsum 1580-1780 parts, modifier 10-30 parts, active mineral admixture 100-130 parts, cement 100-140 parts, metakaolin 15-40 parts, coal gangue slag 10-35 parts, early strength agent 5-10 parts, and water 50-80 parts. The two phosphogypsum materials provided in the above two patent applications have a relatively high phosphogypsum content, but the early strength of the materials themselves is low, the strength grows slowly, and it is difficult to be widely applied. SUMMARY

[0006] The present application provides a self-toughening phosphogypsum flow state solidification backfill material with adjustable strength, which has good working performance and mechanical properties, no retardation phenomenon, can avoid the defects caused by the use of phosphogypsum while ensuring high strength and high flow state, effectively improves the use amount of phosphogypsum, and has important practical popularization value.

[0007] The self-toughening phosphogypsum flow state solidification backfill material with adjustable strength comprises raw materials in parts by mass: modified phosphogypsum 600-1500 parts, cement 40-120 parts, persulfur gelation admixture 80-230 parts, silica fume 2-8 parts, quick-setting rheological agent 1-4 parts, water reducing agent 5-20 parts, self-toughening resin 20-30 parts, complex cross-linking reinforcing agent 10-50 parts, and water 100-400 parts; the modified phosphogypsum is prepared after the pH value of phosphogypsum waste residue is adjusted (for example, adjusted by using lime powder) to 6-8; and the self-toughening resin is prepared by mixing cashew phenol and phenolic aldehyde at a mass ratio of 2:1.

[0008] Preferably, the preparation method of the complex cross-linking reinforcing agent comprises the following steps: stirring uniformly 300-400 parts of water at 60°C, 4.5-6 parts of sodium hydroxide and 2-3 parts of sodium carbonate, adding 40-50 parts of oleic acid and stirring until the oleic acid is dissolved, and then adding 600-700 parts of water at room temperature and stirring uniformly; after the mixture is cooled to ≤35°C, 23-29 parts of ammonia water, 5-10 parts of a complexing agent and 50-100 parts of water glass are added, and the complex cross-linking reinforcing agent is stirred uniformly to obtain the finished product.

[0009] More preferably, the complexing agent is at least one of ethylenediaminetetraacetic acid, dihydroxyethyl glycine, amino triacetic acid and tartaric acid.

[0010] Preferably, the over-sulfur cement admixture is prepared by mixing and grinding 2.8-3.2 parts of blast furnace slag, 0.9-1.1 parts of metakaolin and 0.9-1.1 parts of limestone powder by mass.

[0011] Preferably, the quick-setting rheological agent is prepared by uniformly mixing at least one of sodium aluminate, aluminum chloride and aluminum fluoride with at least one of hydroxyethyl cellulose, hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose at a ratio of (39-41):(0.9-1.1).

[0012] When the strength grade is required to be above 20 MPa, the composition includes modified phosphogypsum 1320 parts, cement 95 parts, over-sulfur cement admixture 200 parts, silica fume 5 parts, quick-setting rheological agent 3 parts, water reducing agent 14.9 parts, complex cross-linking reinforcing agent 13.2 parts, self-toughening resin 24 parts, and water 169 parts by mass;

[0013] When the strength grade is required to be above 15 MPa, the composition includes modified phosphogypsum 1389 parts, cement 79 parts, over-sulfur cement admixture 167 parts, silica fume 4 parts, quick-setting rheological agent 2.5 parts, water reducing agent 15.0 parts, complex cross-linking reinforcing agent 13.9 parts, self-toughening resin 24 parts, and water 149 parts by mass;

[0014] When the strength grade is required to be above 10 MPa, the composition includes modified phosphogypsum 1444 parts, cement 63 parts, over-sulfur cement admixture 133 parts, silica fume 3 parts, quick-setting rheological agent 2 parts, water reducing agent 15.0 parts, complex cross-linking reinforcing agent 14.4 parts, self-toughening resin 24 parts, and water 143 parts by mass.

[0015] Preferably, the self-toughening phosphogypsum flowable solidification backfill material with adjustable strength provided by the application further includes 1-30 parts of foam by mass. The function of the foam is to prepare light flowable backfill material. The foam can be selected from commercially available foaming agents containing one or more of K12, AES and AOE. The aqueous solution of the foaming agent is physically foamed to form the foam. The final foam density is 48-52 kg / m3, and the 1h bleeding rate is ≤25 ml / L.

[0016] More preferably, the strength-adjustable self-toughening phosphogypsum flow-state solidified backfill material provided by the present application, under the premise of containing foam, when the strength grade is required to be 5 MPa or more, includes, by mass fraction, modified phosphogypsum 840 parts, cement 53 parts, over-sulfur cementing admixture 111 parts, silica fume 3 parts, rapid-setting rheological agent 1.7 parts, water reducing agent 9.2 parts, complex cross-linking reinforcing agent 8.4 parts, self-toughening resin 24 parts, water 155 parts, and foam 8.5 parts.

[0017] When the strength grade is required to be 3 MPa or more, the strength-adjustable self-toughening phosphogypsum flow-state solidified backfill material includes, by mass fraction, modified phosphogypsum 630 parts, cement 40 parts, over-sulfur cementing admixture 83 parts, silica fume 2 parts, rapid-setting rheological agent 1.3 parts, water reducing agent 6.9 parts, complex cross-linking reinforcing agent 6.3 parts, self-toughening resin 24 parts, water 116 parts, and foam 26 parts.

[0018] In the above strength-adjustable self-toughening phosphogypsum flow-state solidified backfill material, the use of over-sulfur cementing admixture can promote the reaction and crystallization of part of the phosphogypsum and cementing materials, improve the overall strength, and promote the setting and hardening process of the phosphogypsum.

[0019] To solve the problem of difficult dispersion of phosphogypsum, a water reducing agent is used to increase the surface activity of the phosphogypsum particles. Preferably, in the preparation of light flow-state backfill material, the foaming agent in the additional foam and the water reducing agent synergistically act to be dispersed to form a slurry at a lower water-binder ratio. However, the use of the water reducing agent exacerbates the bleeding of the phosphogypsum slurry; therefore, the use of silica fume particles with a smaller particle size to fill the voids of the phosphogypsum particles can ensure the workability and fluidity of the slurry.

[0020] The complex cross-linking reinforcing agent not only can stimulate the strength of the phosphogypsum and the over-sulfur cementing material, but also can provide a reaction environment required for the hydration of the self-toughening resin. The self-toughening resin monomers form a micro-filament structure in the slurry during the stirring of the phosphogypsum, which can form a self-toughening effect similar to the addition of fibers.

[0021] The present application also provides a preparation method of the above strength-adjustable self-toughening phosphogypsum flow-state solidified backfill material. The modified phosphogypsum powder, cement, silica fume, over-sulfur cementing admixture, rapid-setting rheological agent, and complex cross-linking reinforcing agent are first mixed uniformly, then water and a water reducing agent are mixed uniformly, and finally a self-toughening resin is added and stirred uniformly to obtain a finished product.

[0022] When the material further contains foam, the preparation method of the self-toughening phosphogypsum flow-state solidified backfill material with adjustable strength provided by the present application is as follows: first, mix the modified phosphogypsum powder, cement, silica fume, persulfur cementitious admixture and complex cross-linking reinforcing agent uniformly, then add water, rapid-setting rheological agent, water reducing agent and self-toughening resin to mix uniformly, and finally add foam to stir uniformly to obtain the finished product.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] 1. The setting time of the self-toughening phosphogypsum flow-state solidified backfill material with adjustable strength provided by the present application is less than 22 h, and the 28-day compressive strength can be adjusted in the range of 3-25 MPa, which is suitable for the needs of multiple scene applications.

[0025] 2. The self-toughening phosphogypsum flow-state solidified backfill material provided by the present application meets the needs of different backfill projects for the strength and fluidity of backfill materials, has excellent mechanical properties, and the setting time is controllable; water can be effectively locked during the preparation process, and the material has good fluidity and is not prone to segregation and water bleeding, and has good water damage resistance stability after construction.

[0026] 3. The self-toughening phosphogypsum flow-state solidified backfill material provided by the present application can be applied to various grades of highway engineering base construction, and if it can be applied on a large scale, it can effectively reduce the storage of phosphogypsum and reduce the pollution of the environment. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The following examples and comparative examples prepare the self-toughening phosphogypsum flow-state solidified backfill material, and if not otherwise specified, the raw materials used are prepared and provided in the following amounts and preparation methods:

[0029] (1) In the raw materials used, the cement is ordinary portland cement with P O 42.5, the silica fume has a SiO2 content of >93%, and the water reducing agent is a polycarboxylic acid water reducing agent.

[0030] (2) The preparation method of the modified phosphogypsum used as a raw material is to crush the purchased phosphogypsum waste residue to a particle size of ≤0.6 mm, and then use a pH adjuster to adjust the pH value to 6-8, which is the modified phosphogypsum. The pH adjuster can be sodium hydroxide, or calcium carbide slag, calcium hydroxide, etc.

[0031] (3) The persulfur cementitious admixture used as a raw material is to mix 60 parts of blast furnace slag, 20 parts of metakaolin and 20 parts of limestone powder uniformly, and then grind to a specific surface area of ≥400 m2 / g.2 / kg.

[0032] (4) The raw material used for self-toughening resin is prepared by mixing cashew phenol (commercially available) and phenolic resin (commercially available, foaming product of phenol and formaldehyde) in a mass ratio of 2:1.

[0033] In order to facilitate the testing of material performance, if not specially stated, the raw material complex cross-linking reinforcing agent used is dissolved by stirring in 350 parts of hot water (such as about 60°C), adding 5.5 parts of sodium hydroxide and 2.5 parts of sodium carbonate, then quickly adding 45 parts of oleic acid and stirring until dissolved; then adding 650 parts of cold water (such as about 25°C) and stirring until dissolved; then adding 26 parts of ammonia water (concentration can be selected as 25-28%), 7 parts of complexing agent and 75 parts of water glass, and stirring until dissolved. The water emulsion obtained is the complex cross-linking reinforcing agent.

[0034] In addition, in the preparation method of the above-mentioned complex cross-linking reinforcing agent, the hot water can also be selected as 300-400 parts, the sodium hydroxide can also be selected as 4.5-6 parts, the sodium carbonate can also be selected as 2-3 parts, the oleic acid can also be selected as 40-50 parts, the cold water can also be selected as 600-700 parts, the ammonia water can also be selected as 23-29 parts, the complexing agent can also be selected as 5-10 parts, and the water glass can also be selected as 50-100 parts.

[0035] In the preparation method of the above-mentioned complex cross-linking reinforcing agent, the complexing agent can also be selected as at least one of ethylenediaminetetraacetic acid (EDTA), dihydroxyethyl glycine (DEG), nitrilotriacetic acid (NTA) and tartaric acid (TA). In order to facilitate the testing of material performance, ethylenediaminetetraacetic acid (EDTA) is used in the following examples and comparative examples.

[0036] Optionally, in the preparation method of the above-mentioned complex cross-linking reinforcing agent, the modulus of the water glass is 3.1-3.3, and the effective solid content is 28-32%.

[0037] (5) The over-sulfur gelation admixture used is prepared by mixing blast furnace slag, metakaolin and limestone powder in a mass ratio of 3:1:1 and then grinding. 2 / kg. Optionally, the mass fractions of the above-mentioned three can be any value in the range of 2.8-3.2 parts, 0.9-1.1 parts and 0.9-1.1 parts.

[0038] (6) When the self-toughening phosphogypsum flowable solidification backfill material also contains a rapid-setting rheological agent, the rapid-setting rheological agent can be selected as at least one of sodium aluminate, aluminum chloride and aluminum fluoride, and at least one of hydroxyethyl cellulose, hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose, and mixed in a mass ratio of 40:1.

[0039] For the convenience of testing the material performance, the following examples and comparative examples are uniformly prepared by mixing sodium metaaluminate and hydroxyethyl cellulose in a ratio of 40:1.

[0040] (7) When the self-toughening phosphogypsum flow-state solidified backfill material further contains foam, the foam can be selected from commercially available foaming agents containing one or more of K12, AES and AOE. In use, the water solution of the foaming agent is physically foamed to form foam, and the density of the foam is 48-52 kg / m 3 , and the 1h bleeding rate is ≤25 ml / L.

[0041] The phosphogypsum flow-state solidified backfill materials provided in the following examples and comparative examples are prepared according to the following methods according to whether or not a rapid-setting rheological agent and / or foam is added:

[0042] The raw materials are weighed according to the mixing ratio in Table 1 or Table 2; the modified phosphogypsum powder, cement, silica fume (if any), persulfate cementing admixture and complex cross-linking reinforcing agent are added to an intermittent forced mixer, and dry mixing is performed for 30-40 s to mix uniformly; then water, a rapid-setting rheological agent (if any) and a water reducing agent are added, and wet mixing is performed for 60 s to mix uniformly, and finally self-toughening resin and foam (if any) are added and stirred for 60 s to obtain the finished product.

[0043] Examples:

[0044] The phosphogypsum flow-state solidified backfill materials provided in the following examples are prepared according to the mixing ratio in Table 1.

[0045] Table 1: Mixing ratio of the solidified backfill materials of Examples 1-6, kg / m 3

[0046]

[0047] Comparative examples:

[0048] The phosphogypsum flow-state solidified backfill materials provided in the following comparative examples are prepared according to the mixing ratio in Table 1.

[0049] Table 1: Mixing ratio of the solidified backfill materials of Comparative Examples 1 and 2, kg / m 3

[0050]

[0051] According to the method of "Cement mortar strength test method (ISO method) GB / T 17671-2021", "Cement mortar fluidity determination method GB / T 2419-2005", "Cement standard consistency water consumption, setting time, stability test method standard GB T 1346-2011", the above phosphogypsum flow state solidification backfill material is molded, vibrated, formed, and the surface is covered with a water-impermeable film for film curing when performing performance testing. After demolding, standard curing is performed, and the strength-adjustable phosphogypsum flow state solidification backfill material is obtained. The performance test results are shown in Tables 3 and 4.

[0052] Table 3 Performance test results of examples and comparative examples

[0053]

[0054] From Table 3 above, it can be seen that the self-toughening phosphogypsum flow state solidification backfill material prepared in Examples 1-6 has a setting time of less than 22 h; the 28-day compressive strength can be adjusted in the range of 3-25 MPa, the 90 flexural strength can be up to 3.4 MPa, after adding the self-toughening resin, the resin crosslinks in the slurry to produce a fiber toughening effect, greatly improving the toughness and fatigue resistance of the flow state solidification material; and the spreadability is > 19 mm, with excellent construction fluidity; compared with Example 1, Comparative Example 1 has lower slurry strength, and Comparative Example 2 has extremely poor fluidity due to serious bleeding and segregation, and the setting time is > 48 h due to the serious retarding effect of phosphogypsum on cement.

[0055] The above specific embodiments describe the implementation of the present application in detail, but the present application is not limited to the specific details in the above embodiments. Within the scope of the claims and technical concepts of the present application, the technical solutions of the present application can be modified and changed in many simple ways, and these simple modifications all belong to the protection scope of the present application.

Claims

1. A self-toughening phosphogypsum flowable solidified backfill material with adjustable strength, characterized in that, The raw material includes, by mass fraction: modified phosphogypsum 600-1500 parts, cement 40-120 parts, super sulfur gelation admixture 80-230 parts, silica fume 2-8 parts, rapid setting rheological agent 1-4 parts, water reducing agent 5-20 parts, self-toughening resin 20-30 parts, complex cross-linking reinforcing agent 10-50 parts, and water 100-400 parts; the modified phosphogypsum is prepared after the pH value of phosphogypsum waste residue is adjusted to 6-8; the self-toughening resin is prepared by mixing cashew phenol and phenolic aldehyde according to a mass ratio of 2:1; The preparation method of the complex cross-linking reinforcing agent includes: stirring uniformly 300-400 parts of water at 60 DEG C, 4.5-6 parts of sodium hydroxide and 2-3 parts of sodium carbonate, adding 40-50 parts of oleic acid and stirring until the oleic acid is dissolved, adding 600-700 parts of water at room temperature and stirring uniformly; after the mixture is cooled to ≤35 DEG C, 23-29 parts of ammonia water, 5-10 parts of complexing agent and 50-100 parts of water glass are added, and the complex cross-linking reinforcing agent is prepared by stirring uniformly; The super sulfur gelation admixture is prepared by mixing and grinding 2.8-3.2 parts of blast furnace slag, 0.9-1.1 parts of metakaolin and 0.9-1.1 parts of limestone powder according to mass fraction; The rapid setting rheological agent is prepared by mixing at least one of sodium metaaluminate, aluminum chloride and aluminum fluoride with at least one of hydroxyethyl cellulose, hydroxyethyl methyl cellulose and hydroxypropyl methyl cellulose according to (39-41):(0.9-1.1).

2. The strength-adjustable, self-toughening phosphogypsum flowable solidified backfill material according to claim 1, characterized in that The complexing agent is at least one of ethylenediaminetetraacetic acid, dihydroxyethyl glycine, amino triacetic acid and tartaric acid.

3. The strength-adjustable, self-toughening phosphogypsum flowable solidified backfill material according to claim 1 or 2, characterized in that The raw material includes, by mass fraction: modified phosphogypsum 1250 parts, cement 111 parts, super sulfur gelation admixture 233 parts, silica fume 6 parts, rapid setting rheological agent 3.5 parts, water reducing agent 14.8 parts, complex cross-linking reinforcing agent 12.5 parts, self-toughening resin 24 parts, and water 188 parts; Alternatively, the raw material includes, by mass fraction: modified phosphogypsum 1320 parts, cement 95 parts, super sulfur gelation admixture 200 parts, silica fume 5 parts, rapid setting rheological agent 3 parts, water reducing agent 14.9 parts, complex cross-linking reinforcing agent 13.2 parts, self-toughening resin 24 parts, and water 169 parts; Alternatively, the raw material includes, by mass fraction: modified phosphogypsum 1389 parts, cement 79 parts, super sulfur gelation admixture 167 parts, silica fume 4 parts, rapid setting rheological agent 2.5 parts, water reducing agent 15.0 parts, complex cross-linking reinforcing agent 13.9 parts, self-toughening resin 24 parts, and water 149 parts; Alternatively, the raw material includes, by mass fraction: modified phosphogypsum 1444 parts, cement 63 parts, super sulfur gelation admixture 133 parts, silica fume 3 parts, rapid setting rheological agent 2 parts, water reducing agent 15.0 parts, complex cross-linking reinforcing agent 14.4 parts, self-toughening resin 24 parts, and water 143 parts.

4. The self-toughening phosphogypsum flowable solidified backfill material of adjustable strength according to claim 1 or 2, characterized in that, By mass parts also include 1-30 parts of foam; the foam is formed by physical foaming of an aqueous solution containing at least one foaming agent of K12, AES, AOE, and has a density of 48-52 kg / m 3 , 1h bleeding rate ≤25 ml / L.

5. The strength-adjustable, self-toughening phosphogypsum flowable solidified backfill material according to claim 4, characterized in that The raw material includes, by mass fraction: modified phosphogypsum 840 parts, cement 53 parts, super sulfur gelation admixture 111 parts, silica fume 3 parts, rapid setting rheological agent 1.7 parts, water reducing agent 9.2 parts, complex cross-linking reinforcing agent 8.4 parts, self-toughening resin 24 parts, water 155 parts, and foam 8.5 parts. Alternatively, by mass, including modified phosphogypsum 630 parts, cement 40 parts, over sulfur gelation admixture 83 parts, silica fume 2 parts, quick-setting rheological agent 1.3 parts, water reducing agent 6.9 parts, complex cross-linking reinforcing agent 6.3 parts, self-toughening resin 24 parts, water 116 parts, foam 26 parts.

6. The process for the preparation of the self-toughening phosphogypsum flowable solidified backfill material with adjustable strength according to any one of claims 1 to 3, characterized in that, First, the modified phosphogypsum powder, cement, silica fume, over sulfur gelation admixture, quick-setting rheological agent and complex cross-linking reinforcing agent are mixed uniformly, then water and water reducing agent are added and mixed uniformly, and finally self-toughening resin is added and stirred uniformly to obtain the finished product.

7. A process for the preparation of a self-toughening phosphogypsum flowable solid backfill material of adjustable strength according to claim 4 or 5, characterized in that, First, the modified phosphogypsum powder, cement, silica fume, over sulfur gelation admixture and complex cross-linking reinforcing agent are mixed uniformly, then water, quick-setting rheological agent, water reducing agent and self-toughening resin are added and mixed uniformly, and finally foam is added and stirred uniformly to obtain the finished product.

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