Powdery curing agent suitable for muddy soft soil and preparation method of powdery curing agent

Abstract

The invention provides a powdery curing agent suitable for muddy soft soil and a preparation method thereof, and relates to the technical field of muddy soft soil treatment, the powdery curing agent is prepared from the following components by mass: 4-8 parts of cement, 2-6 parts of fly ash, 8-16 parts of quicklime, 20-30 parts of waste slag, 0.02-0.1 part of a bleeding agent, 30-45 parts of mountain sand, 2-5 parts of a coupling agent, and 2-4 parts of fiber; the curing agent for improving the mucky soft soil is formed by fully utilizing the low-cost waste slag, the low-strength mountain sand and other materials, the problems that an existing curing agent is high in cost and poor in effect can be solved, meanwhile, the water content in the mucky soft soil can be fully reduced through the powder material, the strength of the mucky soft soil can be enhanced, and the curing agent can be used for improving the mucky soft soil. The effect of solidifying the muddy soft soil is improved, and the application range of the solidifying agent is expanded.

Description

Technical Field

[0001] The invention relates to the technical field of silty soft soil treatment, and in particular to a powdery solidifying agent suitable for silty soft soil and a preparation method thereof. Background Art

[0002] There are also various types of curing agents in the existing market according to different applicable environments, including resin curing agents used in industry, and some curing agent materials used for soil curing. Soil curing agents are more commonly used in civil engineering, which is an important way to treat shallow soft foundations. Generally, in-situ curing or mixing and drying are used for curing again. The main working principles of curing agents include two methods. One method is to use cementing materials to cement and solidify the original soil, and the other method is to drain the excess water in the soil to solidify the original soil.

[0003] Some existing curing agents are mainly targeted at clay, heavy metal contaminated soil, marine silt soil and other soils. There are few studies on curing agents for silty soft soil. Most curing agents use inorganic binders to solidify soil. Some of the curing agents use more inorganic binders, which leads to the phenomenon of soil compaction, affecting the subsequent construction and use of the soil. For example, CN117361960A "A low cement clinker soil curing agent and its preparation and application" is suitable for clay, sand and other soils, and achieves the later growth of the strength of the solidified soil. The lower cement clinker content can prolong the setting time of the curing agent. CN115849773B "A soil curing agent and its preparation method" is suitable for soils with a water content of less than 15%, which prolongs the setting time of concrete. Some existing curing agents mainly achieve curing through the bonding effect of inorganic binders, but have high requirements for the requirements and usage of inorganic binders. Some curing agents use organic polymer bonding materials, such as water glass and other expensive materials, which increases the cost of the curing agent and makes it difficult to use it on a large scale in civil engineering construction. Some existing curing agents take a long time to cure, which affects the progress and construction process of the project to a certain extent.

[0004] During the construction process, the treatment measures generally adopted for shallow silty soft soil are mainly divided into replacement, stone throwing and in-situ solidification. The first two methods will remove all or part of the silt and discard it, but there will be a shortage of construction materials during the construction process, thus creating a contradiction. Reasonable and full use of the discarded silt can to a certain extent meet the needs of a sustainable society, protect the environment, reduce the impact on the ecology, and can also reduce the procurement cost of engineering materials and improve the quality of the project.

[0005] In summary, for the existing curing agents on the market, silt soft soil is a common engineering soil in civil engineering. It is necessary to solve the problems of high cost and small application range of curing agents, and to remove the moisture in the silt soil while consolidating the silt soft soil, so as to better achieve the curing effect of the silt soft soil, shorten the reaction time of the curing agent, and avoid affecting the engineering construction. Summary of the invention

[0006] The embodiment of the present invention provides a powdered solidifying agent suitable for silty soft soil and a preparation method thereof, so as to solve the above-mentioned problems.

[0007] A powdered solidifying agent suitable for silty soft soil is prepared from the following components in parts by mass:

[0008] Cement: 4-8 parts, fly ash: 2-6 parts, quicklime: 8-16 parts, waste slag: 20-30 parts, water-exuding agent: 0.02-0.1 parts, mountain sand: 30-45 parts, coupling agent: 2-5 parts, fiber: 2-4 parts.

[0009] Furthermore, the cement is any one of ordinary Portland cement, Portland cement, and composite cement.

[0010] Furthermore, the fly ash is any one of Class I and Class II fly ash.

[0011] Furthermore, the quicklime is any one of calcareous lime and magnesian lime, wherein the content of calcium oxide is not less than 90%.

[0012] Furthermore, the waste slag is any one of steel slag and copper slag.

[0013] Furthermore, the water bleeding agent is any one of polycarboxylate, sodium naphthalenesulfonate formaldehyde, and aminosulfonate, and its natural state is powder state.

[0014] Furthermore, the mountain sand is medium and fine sand, and the mud content is less than 10%.

[0015] Furthermore, the coupling agent is any one of a titanate coupling agent, a chromium complex coupling agent, and a silane coupling agent, and is in a powder state.

[0016] Furthermore, the fiber is any one of basalt fiber, natural fiber, cotton and linen fiber.

[0017] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0018] 1. The curing agent of the present invention has low cost, wide application range, can meet the economic requirements of on-site construction, and has good market application prospects.

[0019] 2. The curing agent of the present invention is suitable for shallow-layer treated silty soft soil, which is quite different from the applicable conditions of other curing agents.

[0020] 3. The curing agent of the present invention is in powder form in normal state, which is convenient for transportation. During use, it can fully utilize the moisture in the silty soft soil, and the moisture in the silty soft soil forms a drainage channel through the water-exuding agent and mountain sand, thereby better achieving drainage.

[0021] 4. The cementing material in the curing agent of the present invention can effectively bond, and the internal slag and mountain sand can enhance and improve the strength of the silty soft soil, thereby ensuring the curing effect of the curing agent.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0023] The technical solution of the present invention is further described in detail below through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 The present invention is a flow chart of a method for preparing a powdered solidifying agent for silty soft soil disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] The disadvantages of the existing technology are that the curing agent is expensive, has a small application range, and cannot be used in a wide range of engineering applications. In addition, the curing treatment effect of the existing curing agent is poor, there is a lack of curing agents for silty soft soil, and the curing agent has a long action time, making it difficult to achieve efficient and rapid curing. Generally, it takes 4 to 7 days to have a certain strength.

[0028] The purpose of the present invention is to solve the problem of high cost of curing agent, adopt common and waste slag in engineering as the main filling material, reduce the preparation cost, simplify the preparation process, realize the curing and cross-linking effect while discharging the internal moisture, improve the effect of curing silty soft soil under the dual effect, and expand the application range of the curing agent.

[0029] In order to solve the problem of treating shallow muddy soft soil during construction, the present invention proposes a powdered curing agent suitable for muddy soft soil, which is prepared from the following components by mass: cement: 4-8 parts, fly ash: 2-6 parts, quicklime: 8-16 parts, waste slag: 20-30 parts, water-exuding agent: 0.02-0.1 parts, mountain sand: 30-45 parts, coupling agent: 2-5 parts, fiber: 2-4 parts, the raw materials are dried and mixed in sequence, and stored in a dry environment. The present invention makes full use of low-cost waste slag and low-strength mountain sand and other materials to form a curing agent for improving muddy soft soil, reducing the problems of high cost and poor effect of existing curing agents. The powdered material can fully reduce the water content in the muddy soft soil and enhance the strength of the muddy soft soil.

[0030] Figure 1 The flowchart of the preparation method of the powdered curing agent for silty soft soil disclosed in the embodiment of the present invention is shown, which comprises the following steps:

[0031] S1, drying the raw materials in an oven at 100°C for 6 to 12 hours, then mixing cement, fly ash and quicklime according to the proportion, stirring evenly and placing for 10 to 15 minutes;

[0032] S2, adding waste slag, mountain sand, fiber, water bleeding agent and coupling agent to the mixture in sequence and mixing evenly, stirring for 10-20 minutes;

[0033] S3, encapsulate the uniformly mixed curing agent and store it in a dry, moisture-proof and ventilated environment for no more than 2 years. It will be discarded if it gets wet.

[0034] Example 1

[0035] A powder solidifying agent suitable for silty soft soil and a preparation method thereof. The components of the solidifying agent are, by weight, 4 parts of cement, 4 parts of fly ash, 8 parts of quicklime, 30 parts of waste slag, 0.05 parts of water bleeding agent, 45 parts of mountain sand, 3 parts of coupling agent and 3 parts of fiber.

[0036] The process of preparing the curing agent is as follows:

[0037] S1, drying the raw materials in an oven at 100°C for 12 hours, then mixing cement, fly ash and quicklime according to the proportion, stirring evenly and placing for 15 minutes.

[0038] S2, add waste slag, mountain sand, fiber, water-exuding agent and coupling agent to the mixture in sequence and mix them evenly, stirring for 20 minutes.

[0039] S3, encapsulate the uniformly mixed curing agent and store it in a dry, moisture-proof and ventilated environment for no more than 2 years. It will be discarded if it gets wet.

[0040] in,

[0041] The cement is any one of ordinary Portland cement, Portland cement and composite cement.

[0042] The fly ash is any one of Class I and Class II fly ash.

[0043] Quicklime is any one of calcareous lime and magnesium lime, wherein the content of calcium oxide is not less than 90%.

[0044] The waste slag is any one of steel slag and copper slag.

[0045] The water bleeding agent is any one of polycarboxylate, sodium naphthalenesulfonate formaldehyde and aminosulfonate, and its natural state is powder state.

[0046] Mountain sand is medium and fine sand with a mud content of less than 10%.

[0047] The coupling agent is any one of a titanate coupling agent, a chromium complex coupling agent and a silane coupling agent, and is in a powder state.

[0048] The fiber is any one of basalt fiber, natural fiber, cotton and linen fiber.

[0049] Take the silty soft soil and mix it with the curing agent in the laboratory. Use a cement concrete mixer to stir it. First, put in 1000g of silty soft soil, then put in 500g of curing agent, stop stirring after stirring for 20 minutes, and leave it at room temperature. After two days, test the natural moisture content, then compact the sample and carry out the CBR test.

[0050] Embodiment 2:

[0051] A powder solidifying agent suitable for silty soft soil and a preparation method thereof. The components of the solidifying agent are, by weight, 6 parts of cement, 4 parts of fly ash, 12 parts of quicklime, 30 parts of waste slag, 0.05 parts of water bleeding agent, 45 parts of mountain sand, 3 parts of coupling agent and 3 parts of fiber.

[0052] The process of preparing the curing agent is as follows:

[0053] S1, drying the raw materials in an oven at 100°C for 12 hours, then mixing cement, fly ash and quicklime according to the proportion, stirring evenly and placing for 15 minutes.

[0054] S2, add waste slag, mountain sand, fiber, water-exuding agent and coupling agent to the mixture in sequence and mix them evenly, stirring for 20 minutes.

[0055] S3, encapsulate the uniformly mixed curing agent and store it in a dry, moisture-proof and ventilated environment for no more than 2 years. It will be discarded if it gets wet.

[0056] in:

[0057] The cement is any one of ordinary Portland cement, Portland cement and composite cement.

[0058] The fly ash is any one of Class I and Class II fly ash.

[0059] Quicklime is any one of calcareous lime and magnesium lime, wherein the content of calcium oxide is not less than 90%.

[0060] The waste slag is any one of steel slag and copper slag.

[0061] The water bleeding agent is any one of polycarboxylate, sodium naphthalenesulfonate formaldehyde and aminosulfonate, and its natural state is powder state.

[0062] Mountain sand is medium and fine sand with a mud content of less than 10%.

[0063] The coupling agent is any one of a titanate coupling agent, a chromium complex coupling agent and a silane coupling agent, and is in a powder state.

[0064] The fiber is any one of basalt fiber, natural fiber, cotton and linen fiber.

[0065] Take the silty soft soil and mix it with the curing agent in the laboratory. Use a cement concrete mixer to stir it. First, put in 1000g of silty soft soil, then put in 500g of curing agent, stop stirring after stirring for 20 minutes, and leave it at room temperature. After two days, test the natural moisture content, then compact the sample and carry out the CBR test.

[0066] Embodiment 3:

[0067] A powder solidifying agent suitable for silty soft soil and a preparation method thereof. The components of the solidifying agent are, by weight, 8 parts of cement, 6 parts of fly ash, 14 parts of quicklime, 30 parts of waste slag, 0.06 parts of water bleeding agent, 45 parts of mountain sand, 3 parts of coupling agent and 3 parts of fiber.

[0068] The process of preparing the curing agent is as follows:

[0069] S1, drying the raw materials in an oven at 100°C for 12 hours, then mixing cement, fly ash and quicklime according to the proportion, stirring evenly and placing for 15 minutes.

[0070] S2, add waste slag, mountain sand, fiber, water-exuding agent and coupling agent to the mixture in sequence and mix them evenly, stirring for 20 minutes.

[0071] S3, encapsulate the uniformly mixed curing agent and store it in a dry, moisture-proof and ventilated environment for no more than 2 years. It will be discarded if it gets wet.

[0072] The cement is any one of ordinary Portland cement, Portland cement and composite cement.

[0073] The fly ash is any one of Class I and Class II fly ash.

[0074] Quicklime is any one of calcareous lime and magnesium lime, wherein the content of calcium oxide is not less than 90%.

[0075] The waste slag is any one of steel slag and copper slag.

[0076] The water bleeding agent is any one of polycarboxylate, sodium naphthalenesulfonate formaldehyde and aminosulfonate, and its natural state is powder state.

[0077] Mountain sand is medium and fine sand with a mud content of less than 10%.

[0078] The coupling agent is any one of a titanate coupling agent, a chromium complex coupling agent and a silane coupling agent, and is in a powder state.

[0079] The fiber is any one of basalt fiber, natural fiber, cotton and linen fiber.

[0080] Take the silty soft soil and mix it with the curing agent in the laboratory. Use a cement concrete mixer to stir it. First, put in 1000g of silty soft soil, then put in 500g of curing agent, stop stirring after stirring for 20 minutes, and leave it at room temperature. After two days, test the natural moisture content, then compact the sample and carry out the CBR test.

[0081] Comparative Example 1:

[0082] 1000 g of silty soft soil without adding a curing agent was taken and stirred in a stirrer for 20 minutes, and then placed at room temperature. The natural moisture content of the silty soft soil was measured after two days. Since the silty soft soil could not be compacted, a CBR specimen could not be formed.

[0083] The comparative data are shown in Tables 1 to 3:

[0084] Table 1:

[0085]

[0086] Table 2:

[0087]

[0088] Table 3:

[0089]

[0090]

[0091] Compared with the prior art, the present invention has the following beneficial effects:

[0092] 1. The curing agent of the present invention has low cost, wide application range, can meet the economic requirements of on-site construction, and has good market application prospects.

[0093] 2. The curing agent of the present invention is suitable for shallow-layer treated silty soft soil, which is quite different from the applicable conditions of other curing agents.

[0094] 3. The curing agent of the present invention is in powder form in normal state, which is convenient for transportation. During use, it can fully utilize the moisture in the silty soft soil, and the moisture in the silty soft soil forms a drainage channel through the water-exuding agent and mountain sand, thereby better achieving drainage.

[0095] 4. The cementing material in the curing agent of the present invention can effectively bond, and the internal slag and mountain sand can enhance and improve the strength of the silty soft soil, thereby ensuring the curing effect of the curing agent.

[0096] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0097] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

Claims

1. A powdery solidifying agent suitable for muddy soft soil, characterized in that: It is prepared from the following components by mass: Cement: 4-8 parts, fly ash: 2-6 parts, quicklime: 8-16 parts, waste slag: 20-30 parts, water-exuding agent: 0.02-0.1 parts, mountain sand: 30-45 parts, coupling agent: 2-5 parts, fiber: 2-4 parts.

2. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The cement is any one of ordinary Portland cement, Portland cement and composite cement.

3. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The fly ash is any one of Class I and Class II fly ash.

4. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The quicklime is any one of calcareous lime and magnesian lime, wherein the content of calcium oxide is not less than 90%.

5. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The waste slag is any one of steel slag and copper slag.

6. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The water bleeding agent is any one of polycarboxylate, sodium naphthalenesulfonate formaldehyde, and aminosulfonate, and its natural state is powder state.

7. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The mountain sand is medium and fine sand, and the mud content is less than 10%.

8. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The coupling agent is any one of a titanate coupling agent, a chromium complex coupling agent, and a silane coupling agent, and is in a powder state.

9. A powdery solidifying agent suitable for muddy soft soil as claimed in claim 1, characterized in that: The fiber is any one of basalt fiber, natural fiber, cotton and linen fiber.

10. A method for preparing a powdered curing agent suitable for muddy soft soil, characterized in that: The steps include: S1, drying the raw materials in an oven at 100°C for 6 to 12 hours, then mixing cement, fly ash and quicklime according to the proportion, stirring evenly and placing for 10 to 15 minutes; S2, adding waste slag, mountain sand, fiber, water-bleeding agent and coupling agent to the mixture in sequence and mixing them evenly for 10 to 20 minutes; S3, encapsulate the uniformly mixed curing agent and store it in a dry, moisture-proof and ventilated environment for no more than 2 years. It will be discarded if it gets wet.

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