A clay stabilizer and its use in membrane bag revetment

Abstract

The application belongs to the field of curing agents, and particularly relates to a clay curing agent and a method for using the clay curing agent in a film bag slope protection. The clay curing agent is characterized by comprising the following raw materials in parts by weight: 40-50 parts of Portland cement; 6-10 parts of microsilica powder; 20-30 parts of quicklime; 0.2-1.2 parts of potassium hydroxide; 0.1-1 parts of sodium sulfate; 5-10 parts of gypsum; 0.3-1 parts of sodium silicate; 0.5-1 parts of lithium carbonate; and 0.02-0.1 parts of styrene-acrylate emulsion. The clay curing agent can replace traditional cement with high energy consumption and high pollution, and can achieve the goals of reaction with water, high strength and good durability while ensuring the reduction of the alkali metal content. The clay curing agent can make the undisturbed soil normally cured under the influence of complex environments such as dry-wet cycles, freeze-thaw cycles and erosion solution.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of solidifying agents, and particularly relates to a clay solidifying agent and a method for using the same in membrane bag slope protection. BACKGROUND

[0002] Riverbank protection engineering construction has the characteristics of water and underwater operation and large-area construction. In conventional construction, steel sheet pile is used for water stop cofferdam dry construction, which has many disadvantages such as many processes, large investment, long construction period, etc. The concrete in the form of a bag has the advantages of large-area operation, simultaneous construction on water and underwater, convenient construction organization, short construction period, rapid formation, etc. However, the large-scale use of concrete leads to an increase in carbon emissions, and a large amount of waste soil is generated during slope excavation and leveling, which wastes a lot of resources. Therefore, a high-performance environmentally friendly solidifying agent can be developed to effectively utilize the original soil resources, so as to achieve the purpose of "waste treatment and waste utilization" and important social and economic benefits.

[0003] Chinese patent CN 116081965 A discloses a formula and preparation method of pumpable silty clay concrete. The designed solidifying agent provides acid root anions to cement with alkali metal ions in the soil body to achieve in-situ solidification of silty clay base material, realizing effective recycling of silty clay generated at the construction site. However, it has many components, and the amount of clay is small. The raw materials also need high-temperature treatment, which is not conducive to actual application on site. SUMMARY

[0004] In view of the problems existing in the comprehensive utilization of clay resources in the present riverbank protection engineering construction, the application provides a solidifying agent for river clay, which replaces traditional cement with high energy consumption and high pollution, and realizes the goals of reaction with water, high strength, good durability, etc. while ensuring the reduction of alkali metal content. The original soil can be normally solidified under the influence of complex environments such as dry-wet cycle, freeze-thaw cycle and erosion solution. The solidifying agent can be applied to membrane bag slope protection, and a large amount of waste soil is generated during slope excavation and leveling. The material is locally sourced, and the solid waste is truly resourceized.

[0005] The technical scheme of the application is as follows:

[0006] A clay solidifying agent comprises the following raw materials by weight:

[0007]

[0008]

[0009] Preferably, the microsilica has a particle size of 800-1250 mesh and a Si content of more than 60%; and / or, the quicklime has a calcium oxide content of more than 70%.

[0010] Preferably, alumina is also included in an amount of 0-3 parts.

[0011] Another object of the present application is to protect a membrane bag for slope protection in a river embankment engineering, said membrane bag comprising the following raw materials by weight: 10-40 parts of the clay stabilizer, and 100 parts of river clay.

[0012] Another object of the present application is to protect a preparation method of the membrane bag, wherein the clay stabilizer is mixed uniformly, then the river clay is added, and mixed uniformly, and then water is added and mixed uniformly, and then bagged and formed.

[0013] The raw materials of the present application interact with each other, and the tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite in the silicate cement react with water, and a large amount of colloidal mixture is rapidly generated after the cement is mixed with the waste tailings through the above reaction, a large amount of heat is released, and the water in the soil body is solidified. With the progress of the reaction, some of the generated colloidal substances will harden, and when the hardened colloids gradually increase, a space network structure will be formed, improving the strength of the clay. Gypsum can provide sulfate ions to react with Ca-H to form ettringite, filling the pores in the test sample and improving the density of the test sample; lithium carbonate and sodium silicate provide an alkaline environment, and the alkaline activator can quickly activate the soil activity, and reasonable collocation with the clinker activator can achieve the purpose of controllable and adjustable setting time; silica fume, on the one hand, increases the slurry consistency due to its small particle size, and its active ingredients can generate hydrated calcium silicate gel in an alkaline environment to enhance the slurry structure; the styrene-acrylate emulsion plays a role in film formation and bonding in the grouting material slurry, and is uniformly distributed in the slurry matrix, which can improve the energy consumption capacity of the slurry crack propagation process. In addition, it can form filamentous colloidal substances in the later hydration stage, similar to fiber inlaying in the slurry, so it can greatly increase the toughness and seismic performance of the grouting stone body.

[0014] Advantages of the present application

[0015] (1) Low production cost: the membrane bag slope protection material produced by the present application is mainly the large amount of waste soil generated during slope excavation and leveling, which realizes true resource utilization of solid waste by taking materials locally; during preparation, only the various powdered materials need to be uniformly mixed, without the need for special temperature and pressure; during construction, only a certain proportion of the stabilizer needs to be mixed and stirred in the clay according to the site requirements, and the construction is simple and convenient.

[0016] (2) curing time is short, hardening fast, high compressive strength, freeze-thaw effect is good, stable performance, inorganic curing agent improved soil long life; under standard curing conditions, according to the curing agent: river clay = 4:6 mass ratio of mixed, 3 hours unconfined compressive strength can reach 5-8MPa, 28 days unconfined compressive strength can reach 26-32MPa, meet the small Qing River navigation project in the membrane bag slope C25 concrete strength requirements.

[0017] (3) the clay curing agent of the present application, instead of the traditional high energy consumption, high pollution of cement, while ensuring to reduce the alkali content, achieve the goal of adding water can be reacted, high strength, good durability. Can make the original soil in dry-wet cycle, freeze-thaw cycle and erosion solution under the influence of complex environment such as normal curing. DETAILED DESCRIPTION

[0018] Example 1

[0019] According to the material ratio in table 1 to produce curing agent.

[0020] The waste soil is taken from the waste soil (to be clay) produced in the process of slope excavation and leveling in the membrane bag slope of the small Qing River navigation project. According to the design formula, the corresponding curing agent is prepared, as shown in table 1, the original soil is taken out from the high water retention, packaged bag, weighed, mixed according to the curing agent: river clay = 4:6 mass ratio, artificial mixing until uniform, adding pure water, artificial mixing again, in order to achieve a higher degree of uniformity (water cement ratio = 1.8; slump 126mm; funnel clay 30s); the above curing agent-clay neat paste is carefully poured into 100mm×100mm×100mm six cubic steel test mold (mold), vibration compaction forming, sample 6, a layer of plastic wrap is sealed on the upper part to prevent contact with the external air and water loss, put into standard curing box (relative humidity 95%, temperature 20℃) curing to 3d, 28d take out, carry out unconfined compressive strength test. The average value of the strength of the curing soil mixed with each curing agent is shown in table 2.

[0021] Table 1 material ratio of curing agent

[0022]

[0023]

[0024] Table 2 determination of curing performance of engineering waste soil

[0025] Example Curing agent dosage 3-day average compressive strength 28-day average compressive strength 1 40％ 5.8 MPa 28.4 MPa

[0026] Example 2

[0027] According to the material ratio in table 3 to produce curing agent.

[0028] The waste soil is taken from the waste soil (which is clay) produced in the process of slope excavation and leveling in the membrane bag slope protection of Xiaoqing River navigation project. The corresponding solidifying agent is prepared according to the design formula, as shown in Table 3, the original soil is taken out from the packaging bag with high water retention, weighed, mixed according to the mass ratio of solidifying agent: river clay = 4:6, manually mixed until uniform, add pure water, manually mix again to achieve a higher degree of uniformity (water-cement ratio = 1.8; slump 126 mm; funnel clay 30 s); the above solidifying agent-clay neat paste is carefully poured into a 100 mm*100 mm*100 mm six-cube steel test mold (mold), vibration compaction forming, sample 6, a layer of plastic wrap is sealed on the upper part to prevent contact with the external air and water loss, put into a standard curing box (relative humidity 95%, temperature 20°C) curing to 3d, 28d, take out, carry out unconfined compressive strength test. The average strength of the solidified soil with each solidifying agent is shown in Table 4.

[0029] Table 3 solidifying agent material ratio

[0030]

[0031]

[0032] Table 4 solidifying performance of waste soil

[0033] Example Curing agent dosage 3-day average compressive strength 28-day average compressive strength 1 40％ 6.2 MPa 30.2 MPa

[0034] Example 3

[0035] The solidifying agent is prepared according to the material ratio in Table 5.

[0036] The waste soil is taken from the waste soil (which is clay) produced in the process of slope excavation and leveling in the membrane bag slope protection of Xiaoqing River navigation project. The corresponding solidifying agent is prepared according to the design formula, as shown in Table 5, the original soil is taken out from the packaging bag with high water retention, weighed, mixed according to the mass ratio of solidifying agent: river clay = 4:6, manually mixed until uniform, add pure water, manually mix again to achieve a higher degree of uniformity (water-cement ratio = 1.8; slump 126 mm; funnel clay 30 s); the above solidifying agent-clay neat paste is carefully poured into a 100 mm*100 mm*100 mm six-cube steel test mold (mold), vibration compaction forming, sample 6, a layer of plastic wrap is sealed on the upper part to prevent contact with the external air and water loss, put into a standard curing box (relative humidity 95%, temperature 20°C) curing to 3d, 28d, take out, carry out unconfined compressive strength test. The average strength of the solidified soil with each solidifying agent is shown in Table 6.

[0037] Table 5 solidifying agent material ratio

[0038]

[0039]

[0040] Table 6 Engineering waste soil solidification performance determination

[0041] Example Curing agent dosage 3-day average compressive strength 28-day average compressive strength 1 40％ 6.8 MPa 31.6 MPa

[0042] Example 4

[0043] The solidifying agent was made according to the material ratio in Table 7.

[0044] The waste soil was taken from the waste soil (to be clay) produced in the process of excavation and leveling of the membrane bag slope in Xiaqing River navigation project. The corresponding solidifying agent was prepared according to the design formula, as shown in Table 1. The original soil was taken out from the packaging bag with high water retention, weighed, mixed according to the mass ratio of solidifying agent: river clay = 1:9, manually mixed until uniform, added with pure water, and manually mixed again to achieve a higher uniformity (water-binder ratio = 1.8; slump degree 126 mm; clay in funnel 30 s). The above solidifying agent-clay neat paste was carefully poured into a 100 mm x 100 mm x 100 mm six-cube steel mold (mold), vibrated and compacted to form a sample, six samples were prepared, a layer of plastic wrap was sealed on the upper part to prevent contact with external air and water loss, and the samples were placed in a standard curing box (relative humidity 95%, temperature 20°C) for curing for 3d and 28d, then taken out to carry out unconfined compressive strength test. The average strength of the solidified soil with each solidifying agent under different mixing ratios is shown in Table 8.

[0045] Table 7 Solidifying agent material ratio

[0046]

[0047]

[0048] Table 8 Engineering waste soil solidification performance determination

[0049] Example Curing agent dosage 3-day average compressive strength 28-day average compressive strength 4 10％ 2.2 5.79

[0050] Example 5

[0051] The solidifying agent was made according to the material ratio in Table 9.

[0052] The waste soil is taken from the waste soil (to be clay) produced in the process of excavation and leveling of the membrane bag slope in Xiaoqing River navigation project. The corresponding solidifying agent is prepared according to the design formula, as shown in Table 1, the original soil is taken out from the packaging bag with high water retention, weighed, mixed according to the mass ratio of solidifying agent: river clay = 3:7, manually mixed until uniform, add pure water, manually mix again to achieve a higher uniformity (water-cement ratio = 1.8; slump 126 mm; funnel clay 30 s); the above solidifying agent-clay neat paste is carefully poured into a 100 mm x 100 mm x 100 mm six-cube steel mold (mold), vibrated and compacted to form a sample, 6 samples are prepared, a layer of plastic wrap is sealed on the upper part to prevent contact with the external air and water loss, and placed in a standard curing box (relative humidity 95%, temperature 20°C) for curing for 3d, 28d, and then taken out to carry out unconfined compressive strength test. The average value of the strength of the solidified soil with each solidifying agent is shown in Table 10.

[0053] Table 9 Solidifying agent material ratio

[0054]

[0055]

[0056] Table 10 Solidifying performance determination of engineering waste soil

[0057] Example Curing agent dosage 3-day average compressive strength 28-day average compressive strength 5 30％ 4.5 18.1

Claims

1. A membrane bag for revetment in a riverbank protection work, characterized by comprising: The film bag comprises the following raw materials by weight: clay stabilizer 10-40 parts, riverway clay 100 parts; The clay stabilizer comprises the following raw materials by weight: Silicate cement 40-50 parts; Microsilica 6-10 parts; Quicklime 20-30 parts; Potassium hydroxide 0.2-1.2 parts; Sodium sulfate 0.1-1 part; Gypsum 5-10 parts; Sodium silicate 0.3-1 part; Lithium carbonate 0.5-1 part; Styrene-acrylate emulsion 0.02-0.1 part.

2. The membrane bag for slope protection in a riverbank protection work according to claim 1, characterized by, The microsilica is 800-1250 mesh, and the Si content is more than 60%.

3. The membrane bag for slope protection in a riverbank protection work according to claim 1, characterized by, The quicklime contains more than 70% calcium oxide.

4. The membrane bag for slope protection in a riverbank protection work according to any one of claims 1 to 3, characterized in that, Aluminum oxide is also included, and the addition amount is 0-3 parts.

5. The membrane bag for slope protection in a riverbank protection work according to any one of claims 1 to 3, characterized in that, The strength of the film bag: 5-8 MPa for 3-hour unconfined compressive strength, and 26-32 MPa for 28-day unconfined compressive strength.

6. A method of producing the film bag according to any one of claims 1 to 5, characterized by, The raw materials of the clay stabilizer are mixed uniformly, then the riverway clay is added, and after being mixed uniformly, water is added and mixed uniformly, and then bagging is performed to form.

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