A solidifying agent for fluidized solidified soil and a method for producing the same

Abstract

This application discloses a curing agent for fluidized solidified soil and its preparation method. The curing agent comprises the following raw materials by weight: 30-45 parts of sulfoaluminate cement, 15-30 parts of gypsum, 10-15 parts of steel slag, 15-25 parts of mineral powder, 3-4.5 parts of carboxymethyl cellulose, 10-15 parts of attapulgite, 5-10 parts of sodium sulfate, 5-10 parts of silane coupling agent modified glass microspheres, and 60-80 parts of water. The curing agent for fluidized solidified soil provided in this application can improve the compressive strength and stability of the solidified soil.

Description

Technical Field

[0001] This application relates to the technical field, and in particular to a curing agent for fluidized solidified soil and its preparation method. Background Technology

[0002] As a new type of backfill material, fluidized solidified soil has many advantages, such as abundant raw materials, which can effectively solve the problem of large demand for natural resources; good self-leveling properties, which can automatically and evenly flow and fill space; high self-compacting properties, which can effectively reduce voids and improve the density of the filler; and moderate strength, which can meet engineering requirements.

[0003] Although fluidized solidified soil has the advantages mentioned above, some problems still exist. For example, the prepared fluidized solidified soil has low strength and large shrinkage deformation. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems and to develop a fluidized solidified soil with low compressive strength and low volume shrinkage, this application provides a solidifying agent for fluidized solidified soil and its preparation method.

[0005] In a first aspect, this application provides a curing agent for fluidized solidified soil, wherein the curing agent comprises the following raw materials by weight: 30-45 parts of sulfoaluminate cement, 15-30 parts of gypsum, 10-15 parts of steel slag, 15-25 parts of mineral powder, 3-8 parts of carboxymethyl cellulose, 7.5-15 parts of attapulgite, 5-10 parts of sodium sulfate, 5-10 parts of silane coupling agent modified glass microspheres, and 60-80 parts of water.

[0006] By adopting the above technical solution, the solidifying agent for fluidized solidified soil provided in this application can solve the problem of poor compressive strength of solidified soil in the prior art, and can reduce the volume shrinkage rate of solidified soil, thereby enabling the solidified soil to maintain long-term stability during long-term use. Specifically, sulfoaluminate cement, gypsum, and steel slag are mixed to generate a high-strength cementitious material, thereby increasing the compressive strength of the solidified soil. The addition of mineral powder can fill the gaps in the cementitious material, reduce the porosity, and improve the density. Carboxymethyl cellulose can increase the bonding properties and fluidity of the solidified soil. The addition of attapulgite and silane coupling agent modified glass microspheres can improve the compressive strength and stability of the solidified soil. When the curing agent is mixed with cement, sodium sulfate effectively activates the reactions of substances such as dicalcium silicate, tricalcium silicate, tricalcium aluminate, and calcium aluminoferrite in the cementitious matrix. Furthermore, it promotes the decomposition of silicon-oxygen tetrahedra and aluminum-oxygen octahedra in clay minerals under strongly alkaline conditions, forming soluble silica and alumina, respectively. These react with soluble calcium in the cement to generate hydrated calcium silicate gel and calcium aluminum sulfate. The calcium silicate gel possesses a highly porous structure and high specific surface area, enabling it to form a three-dimensional network structure. It can combine with attapulgite and silane coupling agent-modified glass microspheres, providing the solidified soil with strong compressive strength and low volume shrinkage, thus ensuring long-term stability during use.

[0007] Optionally, the curing agent comprises the following raw materials by weight: 38-45 parts of sulfoaluminate cement, 23-30 parts of gypsum, 13-15 parts of steel slag, 19-25 parts of mineral powder, 3-4.5 parts of carboxymethyl cellulose, 12-15 parts of attapulgite, 7-10 parts of sodium sulfate, 8-10 parts of silane coupling agent modified glass microspheres, and 69-80 parts of water.

[0008] Optionally, the weight ratio of the sulfoaluminate cement to carboxymethyl cellulose is (9-11):1.

[0009] By adopting the above technical solution, when the weight ratio of sulfoaluminate cement to carboxymethyl cellulose is (9-11):1, the prepared curing agent for fluidized solidified soil can provide strong compressive strength and stability for the solidified soil.

[0010] Optionally, the weight ratio of the sulfoaluminate cement to carboxymethyl cellulose is 10.7:1.

[0011] By adopting the above technical solution, when the weight ratio of sulfoaluminate cement and carboxymethyl cellulose is 10.7:1, the prepared curing agent for fluidized solidified soil can provide strong compressive strength and stability for the solidified soil.

[0012] Optionally, the weight ratio of the attapulgite clay and the silane coupling agent modified glass microspheres is (1.6-1.8):1.

[0013] By adopting the above technical solution, when the weight ratio of attapulgite clay and silane coupling agent modified glass microspheres is (1.6~1.8):1, the prepared curing agent for fluidized solidified soil can provide strong stability and compressive strength for the solidified soil.

[0014] Optionally, the silane coupling agent modified glass microspheres are prepared from a silane coupling agent, glass microspheres and ethanol in a weight ratio of (3-5):10:(10-12).

[0015] By adopting the above technical solution, this application improves the compatibility of glass microspheres with other raw materials by modifying glass microspheres with silane coupling agents when preparing curing agents for fluidized solidified soil. In addition, when the modified glass microspheres are used in combination with attapulgite, they have a good effect on improving the compressive strength and stability of the solidified soil.

[0016] Optionally, the average particle size of the glass microspheres is 30 to 60 micrometers.

[0017] By adopting the above technical solution, when preparing a curing agent for fluidized solidified soil, the compatibility of glass microspheres with other raw materials and their fluidity in the curing agent system can be improved by restricting the glass microspheres, thereby improving the stability and compressive strength of the solidified soil.

[0018] Optionally, the silane coupling agent includes one of silane coupling agent HK-550 and silane coupling agent KH-560.

[0019] Secondly, this application provides a method for preparing a curing agent for fluidized solidified soil, the preparation method comprising the following steps:

[0020] S1. Dissolve the silane coupling agent in ethanol, then add glass microspheres and mix, ultrasonically disperse, remove the solvent, and obtain silane coupling agent modified glass microspheres.

[0021] S2. Divide the water into three equal parts. Mix the first part with sulfoaluminate cement, gypsum, steel slag and mineral powder to obtain the first mixture. S3. Mix the carboxymethyl cellulose and the second part of water to obtain a carboxymethyl cellulose aqueous solution.

[0022] S4. Dissolve attapulgite in the third part of water and mix to obtain an attapulgite aqueous solution. Spray the attapulgite aqueous solution onto the surface of silane coupling agent modified glass microspheres to obtain the second mixture.

[0023] S5. Mix the second mixture and the carboxymethyl cellulose aqueous solution, then add the first mixture and sodium sulfate and mix evenly to obtain a curing agent for fluidized solidified soil.

[0024] By adopting the above technical solution, this application can prepare a curing agent that can improve the compressive strength and stability of solidified soil by using the above preparation method. In the preparation of the curing agent, this application can improve the compatibility between raw materials by mixing them in stages. Furthermore, in the preparation of the curing agent, this application can improve the bonding between silane coupling agent modified glass microspheres and other raw materials by spraying attapulgite soil aqueous solution onto the surface of silane coupling agent modified glass microspheres. This allows the silane coupling agent modified glass microspheres to be tightly bonded together with other raw materials, which helps to enhance the cohesion and stability of the overall curing agent, thereby making the solidified soil exhibit better compressive strength when subjected to external pressure.

[0025] Optionally, the mixing speed in step S5 is 200-400 r / min.

[0026] In summary, the present invention has at least one of the following beneficial technical effects:

[0027] 1. The solidifying agent for fluidized solidified soil provided in this application solves the problem of poor compressive strength of solidified soil in existing technologies and reduces the volume shrinkage rate of solidified soil, thereby enabling the solidified soil to maintain long-term stability during long-term use. Specifically, sulfoaluminate cement, gypsum, and steel slag are mixed to generate a high-strength cementitious material, thereby increasing the strength of the solidified soil. The addition of mineral powder fills the gaps in the cementitious material, reducing porosity and increasing density. Carboxymethyl cellulose increases the bonding properties and fluidity of the solidified soil. The addition of attapulgite and silane coupling agent-modified glass microspheres improves the compressive strength and stability of the solidified soil. When the curing agent is mixed with cement, sodium sulfate effectively activates the reactions of substances such as dicalcium silicate, tricalcium silicate, tricalcium aluminate, and calcium aluminoferrite in the cementitious matrix. Furthermore, it promotes the decomposition of silicon-oxygen tetrahedra and aluminum-oxygen octahedra in clay minerals under strongly alkaline conditions, forming soluble silica and alumina, respectively. These react with soluble calcium in the cement to generate hydrated calcium silicate gel and calcium aluminum sulfate. The calcium silicate gel possesses a highly porous structure and high specific surface area, enabling it to form a three-dimensional network structure. It can combine with attapulgite and silane coupling agent-modified glass microspheres, providing the solidified soil with strong compressive strength and low volume shrinkage, thus ensuring long-term stability during use.

[0028] 2. In preparing the curing agent for fluidized solidified soil, this application improves the compatibility of glass microspheres with other raw materials by modifying glass microspheres with silane coupling agents. In addition, when the modified glass microspheres are used in combination with attapulgite, they have a good effect on improving the compressive strength and stability of the solidified soil.

[0029] 3. This application can prepare a curing agent that can improve the compressive strength and stability of solidified soil by using the above preparation method. In the preparation of the curing agent, the compatibility between raw materials can be improved by mixing them in stages. Furthermore, in the preparation of the curing agent, the bonding between the silane coupling agent modified glass microspheres and other raw materials can be improved by spraying the attapulgite soil aqueous solution onto the surface of the silane coupling agent modified glass microspheres. This allows the silane coupling agent modified glass microspheres to be tightly bonded together with other raw materials, which helps to enhance the cohesion and stability of the overall curing agent, thereby making the solidified soil exhibit better compressive strength when subjected to external pressure. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments.

[0031] Sulfoaluminate cement: Suzhou Jieqianhong Building Materials Co., Ltd.

[0032] Gypsum: Wuxi Jianghuai Building Materials Technology Co., Ltd.; Item No. FS001A.

[0033] Carboxymethyl cellulose: 99.9% effective ingredient content.

[0034] Attapulgite clay: Dadi Attapulgite Processing Plant, Jianxi Town, Mingguang City, item number 456645456445.

[0035] Sodium sulfate: 99.9% effective ingredient content.

[0036] Glass microspheres: average particle size 30-60 micrometers.

[0037] Silane coupling agent KH-550: active ingredient content 99.9%.

[0038] Silane coupling agent KH-560: active ingredient content 99.9%.

[0039] Ordinary Portland cement: Henan Yong'an Bridge and Tunnel Building Materials Co., Ltd.

[0040] Mineral powder: Hebei Runhuabang New Material Technology Co., Ltd.

[0041] Steel slag: Shijiazhuang Yuanjing Mineral Products Co., Ltd. Specific Implementation

[0043] Examples 1-17

[0044] Example 1

[0045] This embodiment provides a curing agent for fluidized solidified soil. The curing agent comprises the following raw materials by weight: 30 parts of sulfoaluminate cement, 15 parts of gypsum, 10 parts of steel slag, 15 parts of mineral powder, 3 parts of carboxymethyl cellulose, 7.5 parts of attapulgite, 5 parts of sodium sulfate, 5 parts of silane coupling agent modified glass microspheres, and 60 parts of water.

[0046] The method for preparing the curing agent for fluidized solidified soil in this embodiment includes the following steps:

[0047] S1. Dissolve the silane coupling agent in ethanol, then add glass microspheres and mix, ultrasonically disperse, remove the solvent, and obtain silane coupling agent modified glass microspheres.

[0048] S2. Divide the water into three equal parts. Mix the first part with sulfoaluminate cement, gypsum, steel slag and mineral powder to obtain the first mixture.

[0049] S3. Mix and stir the carboxymethyl cellulose and the second part of water to obtain an aqueous solution of carboxymethyl cellulose;

[0050] S4. Dissolve attapulgite in the third part of water and mix to obtain an attapulgite aqueous solution. Spray the attapulgite aqueous solution onto the surface of silane coupling agent modified glass microspheres to obtain the second mixture.

[0051] S5. Mix the second mixture and the carboxymethyl cellulose aqueous solution at a stirring speed of 200 r / min, then add the first mixture and sodium sulfate and mix evenly to obtain a curing agent for fluidized solidified soil.

[0052] The difference between Examples 2-5 and Example 1 is that the weight proportions of some components are different when preparing the curing agent for fluidized solidified soil. The differences are shown in Table 1.

[0053] The silane coupling agent used in this embodiment is silane coupling agent KH-550.

[0054] In this embodiment, the weight ratio of silane coupling agent, glass microspheres, and ethanol in the preparation of silane coupling agent modified glass microspheres is 3:10:10.

[0055] The average particle size of the glass microspheres in this embodiment is 60 micrometers.

[0056] Table 1 - Differences between Examples 2-5 and Example 1 (see Table 1 for details).

[0057]

[0058] Comparative Example 1

[0059] The difference between this comparative example and Example 1 is that no attapulgite was added when preparing the curing agent for the fluidized solidified soil in this comparative example.

[0060] Comparative Example 2

[0061] The difference between this comparative example and Example 1 is that this comparative example did not add silane coupling agent modified glass microspheres when preparing the curing agent for fluidized solidified soil.

[0062] Comparative Example 3

[0063] The difference between this comparative example and Example 1 is that this comparative example did not add silane coupling agent modified glass microspheres and attapulgite clay when preparing the curing agent for fluidized solidified soil.

[0064] Comparative Example 4

[0065] The difference between this comparative example and Example 1 is that in this comparative example, all raw materials are mixed and stirred together to prepare the curing agent for fluidized solidified soil.

[0066] Comparative Example 5

[0067] The difference between this comparative example and Example 1 is that the average particle size of the glass microspheres in this comparative example is 75 micrometers.

[0068] Comparative Example 6

[0069] This comparative example is ordinary silicate cement without added curing agent.

[0070] Experimental testing

[0071] This experiment will test the compressive and flexural strength of solidified soil samples prepared by mixing the solidified soil obtained in Examples 1-5 and Comparative Examples 1-5 with a solidifying agent and clay. Additionally, the compressive strength, flexural strength, and volume shrinkage rate of ordinary silicate cement in the comparative examples will also be tested.

[0072] The preparation method of the solidified soil sample is as follows: Excess water is added to the clay, and after thorough stirring, it is allowed to stand for 24 hours to allow the soil to settle naturally. The supernatant water is filtered off to obtain saturated soil under liquid limit conditions. Then, the solidifier and clay are mixed at a clay-cement ratio of 1:9 (weight ratio of solidifier to clay), with a water-to-solid ratio of 0.2. Finally, the uniformly stirred fluidized solidified soil is slowly poured into a 4cm×4cm×16cm steel mold. After curing at room temperature for 24 hours, the mold is removed, and the demolded sample is placed in a dry indoor environment for further curing until 28 days. Its compressive strength and volume stability are then tested. The curing conditions are a temperature of (20±2)℃ and a humidity of 95%.

[0073] The test items are as follows:

[0074] Compressive strength test: Tested according to T / BGEA 001—2019 "Technical Standard for Premixed Flow Solidified Soil Filling Engineering".

[0075] Test method for volume shrinkage rate of premixed fluidized solidified soil: Measure the length, width, and height of the specimen at 28 days using vernier calipers and calculate its volume. The volume of the specimen mold is 4cm × 4cm × 16cm = 256cm. 3 The difference between the measured volume of the test block and the volume of the test mold is defined as the volume shrinkage rate.

[0076] The experimental test results of Examples 1-5 and Comparative Examples 1-6 are shown in Table 2.

[0077] Table 2 - Experimental test results of Examples 1-5 and Comparative Examples 1-6 are shown in the table.

[0078]

[0079]

[0080] Results Analysis: As can be seen from the experimental test results in Table 2, the solidified soil samples prepared using the solidifying agent for fluidized solidified soil provided in this application have the advantages of high compressive strength and low volume shrinkage rate.

[0081] The difference between Examples 2-5 and Example 1 is that, under the condition that the weight ratio of sulfoaluminate cement and carboxymethyl cellulose is 10:1, the weight fraction of the remaining raw materials is adjusted. According to the test results in Table 2, the curing agent prepared by Example 4 can effectively improve the compressive strength and stability of the solidified soil sample.

[0082] The difference between Comparative Example 1 and Example 1 is that attapulgite was not added when preparing the curing agent for the fluidized solidified soil in this comparative example. According to the experimental results in Table 2, the prepared solidified soil sample without the addition of attapulgite exhibited poor compressive strength and high volume shrinkage. Therefore, compared to the solidified soil sample prepared in Example 1, the solidified soil sample prepared in Comparative Example 1 had poorer stability.

[0083] The difference between Comparative Example 2 and Example 1 is that no silane coupling agent-modified glass microspheres were added when preparing the curing agent for the fluidized solidified soil in this comparative example. According to the experimental results in Table 2, the solidified soil sample prepared without the addition of silane coupling agent-modified glass microspheres exhibited poor compressive strength and high volume shrinkage. Therefore, compared to the solidified soil sample prepared in Example 1, the solidified soil sample prepared in Comparative Example 2 had poorer stability.

[0084] The difference between Comparative Example 3 and Example 1 is that, in this comparative example, silane coupling agent-modified glass microspheres and attapulgite were not added when preparing the curing agent for fluidized solidified soil. According to the experimental results in Table 2, when attapulgite was not added, the compressive strength of the prepared solidified soil sample was poor, and the volume shrinkage rate was high. Therefore, compared with the solidified soil sample prepared in Example 1, the stability of the solidified soil sample prepared in Comparative Example 1 was poor. The difference between Comparative Example 2 and Example 1 is that, in this comparative example, silane coupling agent-modified glass microspheres were not added when preparing the curing agent for fluidized solidified soil.

[0085] Based on the experimental results of Comparative Examples 1-3, it can be seen that when preparing the curing agent of this application, the use of silane coupling agent-modified glass microspheres and attapulgite in combination is beneficial to improving the compressive strength of the prepared cured soil sample and can effectively reduce the volume shrinkage rate, enabling the cured soil sample to remain stable over a long period of time. This may be because when the curing agent is mixed with cement, sodium sulfate can effectively activate the reaction of substances such as dicalcium silicate, tricalcium silicate, tricalcium aluminate, and calcium aluminoferrite in the cementitious matrix. Furthermore, it can promote the decomposition of silicon-oxygen tetrahedra and aluminum-oxygen octahedra in clay minerals under strongly alkaline conditions, forming soluble silica and aluminum oxide, respectively. These react with soluble calcium in the cement to generate hydrated calcium silicate gel and calcium aluminum sulfate, etc. Calcium silicate gel has a highly porous structure and a high specific surface area, which can form a three-dimensional network structure. It can combine with attapulgite and silane coupling agent modified glass microspheres, and provide solidified soil with strong compressive strength and low volume shrinkage rate, thus enabling the solidified soil to remain stable for a long time during use.

[0086] The difference between Comparative Example 4 and Example 1 is that in this comparative example, all raw materials were mixed and stirred together to prepare the curing agent for fluidized solidified soil. According to the experimental results in Table 2, different preparation methods for the curing agent for fluidized solidified soil indicate that segmented mixing and addition of materials improves the compatibility between raw materials. Furthermore, in this application, the curing agent for fluidized solidified soil is prepared by dissolving attapulgite in a third part of water to obtain an attapulgite aqueous solution, which is then sprayed onto the surface of silane coupling agent modified glass microspheres. This method allows the silane coupling agent modified glass microspheres to be tightly bonded with other raw materials, enhancing the cohesiveness and stability of the overall curing agent, thereby resulting in better compressive strength of the solidified soil under external pressure. The difference between Comparative Example 5 and Example 1 is that the average particle size of the glass microspheres in this comparative example is 75 micrometers. Based on the experimental results in Table 2, it can be seen that the lifespan of glass microspheres affects the stability of the curing agent on the cured soil. Smaller average particle size has a larger specific surface area, which can improve the compatibility with other raw materials, while larger average particle size is not conducive to better mixing with other raw materials. Therefore, it is particularly important to control the lifespan of glass microspheres when preparing the curing agent in this application.

[0087] Comparative Example 6 is ordinary silicate cement without added curing agent. Based on the experimental results in Table 2, it can be seen that the silicate cement without added curing agent has poor stability and compressive strength.

[0088] Examples 6-8

[0089] Example 6

[0090] The difference between this embodiment and Embodiment 4 is that, in this embodiment, the total weight of sulfoaluminate cement and carboxymethyl cellulose is 47.3g when preparing the curing agent for fluidized solidified soil. The weight ratio of sulfoaluminate cement to carboxymethyl cellulose is 9:1.

[0091] Example 7

[0092] The difference between this embodiment and Embodiment 4 is that, in this embodiment, the total weight of sulfoaluminate cement and carboxymethyl cellulose in the preparation of the curing agent for fluidized solidified soil is 47.3. The weight ratio of sulfoaluminate cement to carboxymethyl cellulose is 10.7:1.

[0093] Example 8

[0094] The difference between this embodiment and Embodiment 4 is that, in this embodiment, the total weight of sulfoaluminate cement and carboxymethyl cellulose in the preparation of the curing agent for fluidized solidified soil is 47.3g. The weight ratio of sulfoaluminate cement to carboxymethyl cellulose is 11:1.

[0095] The experimental test results of Examples 6 to 8 are shown in Table 3.

[0096] Table 3 - Experimental test results of Examples 6 to 6 are shown in the table.

[0097]

[0098]

[0099] Results Analysis: The difference between Examples 6-8 and Example 4 lies in the different weight ratios of aluminate and carboxymethyl cellulose during the preparation of the curing agent. Based on the experimental results in Table 3, it can be seen that the weight ratio of aluminate to carboxymethyl cellulose affects the performance of the prepared curing agent. Based on the experimental results in Table 3, the curing agent prepared in Example 7 can effectively improve the compressive strength of the cured soil sample and effectively reduce the volume shrinkage rate, thus maintaining long-term stability during use.

[0100] Examples 9-12

[0101] Example 9

[0102] The difference between this embodiment and Embodiment 7 is that, in this embodiment, the total weight of attapulgite and silane coupling agent modified glass microspheres in the preparation of the curing agent for fluidized solidified soil is 22.5 parts. The weight ratio of attapulgite to silane coupling agent modified glass microspheres is 1.6:1.

[0103] Example 10

[0104] The difference between this embodiment and Embodiment 7 is that, in this embodiment, the total weight of attapulgite and silane coupling agent modified glass microspheres in the preparation of the curing agent for fluidized solidified soil is 22.5 parts. The weight ratio of attapulgite to silane coupling agent modified glass microspheres is 1.7:1.

[0105] Example 11

[0106] The difference between this embodiment and Embodiment 7 is that, in this embodiment, the total weight of attapulgite and silane coupling agent modified glass microspheres in the preparation of the curing agent for fluidized solidified soil is 22.5 parts. The weight ratio of attapulgite to silane coupling agent modified glass microspheres is 1.77:1.

[0107] Example 12

[0108] The difference between this embodiment and Embodiment 7 is that, in this embodiment, the total weight of attapulgite and silane coupling agent modified glass microspheres in the preparation of the curing agent for fluidized solidified soil is 22.5 parts. The weight ratio of attapulgite to silane coupling agent modified glass microspheres is 1.8:1.

[0109] The experimental test results of Examples 9 to 12 are shown in Table 4.

[0110] Table 4 - Experimental test results of Examples 9 to 12 (see table)

[0111]

[0112]

[0113] Results Analysis: The difference between Examples 9-12 and Example 7 lies in the different weight ratios of attapulgite and silane coupling agent modified glass microspheres during the preparation of the curing agent. Combined with the experimental results in Table 4, it can be seen that the weight ratio of attapulgite to silane coupling agent modified glass microspheres affects the performance of the prepared curing agent. Furthermore, the curing agent prepared in Example 11 can significantly improve the compressive strength of the cured soil sample and effectively reduce the volume shrinkage rate, thus maintaining long-term stability during use.

[0114] Examples 13-15

[0115] Example 13

[0116] The difference between this embodiment and Example 11 is that the weight ratio of silane coupling agent, glass microspheres and ethanol is different when preparing silane coupling agent modified glass microspheres. The weight ratio of silane coupling agent, glass microspheres and ethanol is 4:10:11.

[0117] Example 14

[0118] The difference between this embodiment and Example 11 is that the weight ratio of silane coupling agent, glass microspheres and ethanol is different when preparing silane coupling agent modified glass microspheres. The weight ratio of silane coupling agent, glass microspheres and ethanol is 5:10:12.

[0119] Example 15

[0120] The difference between this embodiment and Embodiment 14 is that the silane coupling agent used in preparing the silane coupling agent modified glass microspheres is silane coupling agent KH-560.

[0121] The experimental test results of Examples 13-15 are shown in Table 5.

[0122] Table 5 - Experimental test results of Examples 13-15 (see table)

[0123] Test items Compressive strength (28d) / MPa Volume shrinkage rate / % Example 11 6.1 0.12 Example 13 6.3 0.10 Example 14 6.6 0.09 Example 15 6.8 0.07

[0124] Results Analysis: The difference between Examples 13-15 and Example 11 lies in the different weight ratios of silane coupling agent, glass microspheres, and ethanol when preparing silane coupling agent modified glass microspheres. Combined with the experimental results in Table 6, it can be seen that the weight ratio of the raw materials for silane coupling agent modified glass microspheres affects the performance of the prepared curing agent. Combined with the experimental results in Table 5, it can be seen that the curing agent prepared in Example 15 can effectively improve the compressive strength of the cured soil sample and effectively reduce the volume shrinkage rate, thus maintaining long-term stability during use.

[0125] Examples 16-17

[0126] Example 16

[0127] The difference between this embodiment and embodiment 15 is that the average particle size of the glass microspheres in this embodiment is 50 micrometers.

[0128] Example 17

[0129] The difference between this embodiment and embodiment 15 is that the average particle size of the glass microspheres in this embodiment is 30 micrometers.

[0130] The experimental test results of Examples 16 and 17 are shown in Table 6.

[0131] Table 6 - Experimental test results of Examples 16-17 (see table)

[0132] Test items Compressive strength (28d) / MPa Volume shrinkage rate / % Example 15 6.8 0.07 Example 16 7.0 0.06 Example 17 7.5 0.05

[0133] Results Analysis: The difference between Examples 16-17 and Example 15 is that the average particle size of the glass microspheres is different. According to the experimental test results in Table 7, the average particle size of the glass microspheres affects the performance of the prepared curing agent. According to the experimental test results in Table 6, the curing agent prepared by Example 17 can better improve the compressive strength of the cured soil sample and can better reduce the volume shrinkage rate, thus maintaining stability for a long time during use.

[0134] Examples 18-19

[0135] Example 18

[0136] The difference between this embodiment and embodiment 17 is that the stirring speed in step S5 of this embodiment is 300 r / min.

[0137] Example 19

[0138] The difference between this embodiment and embodiment 17 is that the stirring speed in step S5 of this embodiment is 400 r / min.

[0139] The experimental test results of Examples 18-19 are shown in Table 7.

[0140] Table 7 - Experimental test results of Examples 18-19 (see table)

[0141] Test items Compressive strength (28d) / MPa Volume shrinkage rate / % Example 17 7.5 0.05 Example 18 7.8 0.03 Example 19 7.7 0.04

[0142] Results Analysis: The difference between Examples 18-19 and Example 17 lies in the stirring speed. As shown in Table 8, the stirring speed affects the performance of the prepared curing agent. Table 7 shows that the curing agent prepared in Example 8 significantly improves the compressive strength of the cured soil sample and reduces the volume shrinkage rate, thus maintaining long-term stability during use. This may be because a stirring speed of 300 r / min in step S5 results in better compatibility between the raw materials, thereby improving the compressive strength of the cured soil sample.

[0143] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A solidifying agent for fluidized solidified soil, characterized by comprising: a water-soluble polymer; and a water-soluble inorganic substance. The curing agent comprises the following raw materials by weight: 30-45 parts of sulphoaluminate cement, 15-30 parts of gypsum, 10-15 parts of steel slag, 15-25 parts of mineral powder, 3-4.5 parts of carboxymethyl cellulose, 7.5-15 parts of attapulgite, 5-10 parts of sodium sulfate, 5-10 parts of silane coupling agent modified glass beads and 60-80 parts of water. The silane coupling agent modified glass beads are prepared from silane coupling agent, glass beads and ethanol in a weight ratio of (3-5):10:(10-12). The average particle size of the glass beads is 30-60 microns. The preparation method of the flowable solidified soil curing agent comprises the following steps: S1, dissolve the silane coupling agent in ethanol, then add glass beads and mix, ultrasonic dispersion, remove the solvent, and prepare silane coupling agent modified glass beads; S2, divide the water into three equal parts, mix the first part with sulphoaluminate cement, gypsum, steel slag and mineral powder to prepare a first mixture; S3, mix and stir carboxymethyl cellulose and the second part of water to prepare a carboxymethyl cellulose aqueous solution; S4, dissolve attapulgite in the third part of water and mix to prepare an attapulgite aqueous solution, spray the attapulgite aqueous solution onto the surface of the silane coupling agent modified glass beads to prepare a second mixture; S5, mix and stir the second mixture and the carboxymethyl cellulose aqueous solution, then add the first mixture and sodium sulfate and mix uniformly to prepare the flowable solidified soil curing agent.

2. The soil stabilizer according to claim 1, wherein The curing agent comprises the following raw materials by weight: 38-45 parts of sulphoaluminate cement, 23-30 parts of gypsum, 13-15 parts of steel slag, 19-25 parts of mineral powder, 3.8-4.5 parts of carboxymethyl cellulose, 12-15 parts of attapulgite, 7-10 parts of sodium sulfate, 8-10 parts of silane coupling agent modified glass beads and 69-80 parts of water.

3. The soil stabilizer according to claim 1, wherein The weight ratio of the sulphoaluminate cement and the carboxymethyl cellulose is (9-11):

1.

4. The soil stabilizer according to claim 3, wherein The weight ratio of the sulphoaluminate cement and the carboxymethyl cellulose is 10.7:

1.

5. The soil stabilizer according to claim 1, wherein The weight ratio of the attapulgite and the silane coupling agent modified glass beads is (1.6-1.8):

1.

6. The soil stabilizer according to claim 1, wherein The silane coupling agent comprises one of silane coupling agent KH-550 and silane coupling agent KH-560.

7. A method for producing the solidifying agent for fluidified solidifying soil according to any one of claims 1 to 6, characterized by, The preparation method comprises the following steps: S1, dissolve the silane coupling agent in ethanol, then add glass beads and mix, ultrasonic dispersion, remove the solvent, and prepare silane coupling agent modified glass beads; S2, divide the water into three equal parts, mix the first part with sulphoaluminate cement, gypsum, steel slag and mineral powder to prepare a first mixture; S3, mix and stir carboxymethyl cellulose and the second part of water to prepare a carboxymethyl cellulose aqueous solution; S4, dissolve attapulgite in the third part of water and mix to prepare an attapulgite aqueous solution, spray the attapulgite aqueous solution onto the surface of the silane coupling agent modified glass beads to prepare a second mixture; S5, mix and stir the second mixture and the carboxymethyl cellulose aqueous solution, then add the first mixture and sodium sulfate and mix uniformly to prepare the flowable solidified soil curing agent.

8. The method of producing a solidifying agent for fluidified solidifying soil according to claim 7, characterized by, The mixing and stirring speed in step S5 is 200-400 r / min.

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