Rock soil curing agent and preparation method thereof

Abstract

The invention discloses a rock soil curing agent and a preparation method thereof, the curing agent is composed of cement, polyvinyl alcohol, nano silica, calcium carbonate, sodium sulfate, fly ash, bentonite, triethanolamine, sodium benzoate and aluminum sulfate, and through a specific ratio and a preparation process, rapid curing, high mechanical properties and good durability are realized. The curing agent is suitable for various geotechnical engineering, such as road construction, foundation treatment and anti-seepage engineering, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to a rock and soil curing agent and a preparation method thereof. Background Art

[0002] Traditional geotechnical solidification technology usually relies on cement as the main curing agent, but this method has problems such as slow curing speed, insufficient mechanical properties and poor durability. In order to improve the curing effect, some auxiliary materials such as polymers, minerals and chemical additives are usually added, but the proportions and preparation methods of these materials often lack systematic research and optimization. In addition, traditional curing agents often fail to meet the requirements of engineering efficiency and economy when dealing with complex geotechnical environments. Summary of the invention

[0003] The purpose of the present invention is to provide a rock and soil solidifying agent and a preparation method thereof.

[0004] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0005] The invention discloses a rock and soil solidifying agent, which comprises cement, polyvinyl alcohol, nano silicon dioxide, calcium carbonate, sodium sulfate, fly ash, bentonite, triethanolamine, sodium benzoate and aluminum sulfate. According to weight ratio, each part of the rock and soil solidifying agent comprises 20 to 40 parts of the cement, 2 to 8 parts of the polyvinyl alcohol, 1 to 3 parts of the nano silicon dioxide, 5 to 15 parts of the calcium carbonate, 1 to 3 parts of the sodium sulfate, 10 to 30 parts of the fly ash, 5 to 15 parts of the bentonite, 3 to 8 parts of the triethanolamine, 5 to 15 parts of the sodium benzoate and 2 to 5 parts of the aluminum sulfate.

[0006] Preferably, by weight, each portion contains 30 parts of the cement, 5 parts of the polyvinyl alcohol, 2 parts of the nano-silicon dioxide, 10 parts of the calcium carbonate, 2 parts of the sodium sulfate, 20 parts of the fly ash, 10 parts of the bentonite, 5 parts of the triethanolamine, 10 parts of the sodium benzoate, and 3 parts of the aluminum sulfate.

[0007] The preparation method of the rock and soil curing agent of the present invention comprises the following steps:

[0008] S1: Cement pretreatment: The cement was dried in an oven at 60 °C for 2 h to remove excess moisture;

[0009] S2: Dissolution of polymer: Add polyvinyl alcohol to deionized water, heat to 40°C and stir until completely dissolved;

[0010] S3: Nano-silica dispersion: Add nano-silica to the above solution and treat it with an ultrasonic disperser for 20 minutes to ensure uniform dispersion;

[0011] S4: Mixing calcium carbonate and sodium sulfate: Mix calcium carbonate and sodium sulfate evenly, and then dry at 100°C for 1 hour;

[0012] S5: Mixing fly ash and bentonite: The fly ash and bentonite were mixed and ground in a ball mill for 20 minutes to increase their specific surface area;

[0013] S6: Mixing cosolvent and preservative: Add triethanolamine and sodium benzoate into deionized water and stir until completely dissolved;

[0014] S7: curing accelerator treatment: dissolve aluminum sulfate in an appropriate amount of deionized water for later use;

[0015] S8: Mixing and stirring: Mix all the processed raw materials except aluminum sulfate in a high-speed mixer, and control the stirring speed at 200 rpm for 20 minutes;

[0016] S9: Solidification: Before use, add aluminum sulfate to the mixed mixture, stir well and wait for solidification.

[0017] The beneficial effects of the present invention are:

[0018] The present invention is a rock and soil solidifying agent and a preparation method thereof. Compared with the prior art, the present invention achieves the following technical effects:

[0019] Fast curing: By adding aluminum sulfate as a curing accelerator, the curing speed is significantly improved and the project cycle is shortened.

[0020] High mechanical properties: The addition of nano-silica and polyvinyl alcohol improves the mechanical properties of the curing agent, including compressive strength and flexural strength.

[0021] Good durability: The composite effect of calcium carbonate, sodium sulfate and bentonite enhances the durability of the curing agent, enabling it to adapt to different environmental conditions.

[0022] Environmentally friendly: Utilizing industrial by-products such as fly ash reduces environmental pollution and reduces costs.

[0023] Easy operation: The preparation and use process of the curing agent is simple, and it is easy to operate and manage on site. DETAILED DESCRIPTION

[0024] The present invention is further described below with specific examples. The illustrative examples and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0025] The invention discloses a rock and soil solidifying agent, which comprises cement, polyvinyl alcohol, nano silicon dioxide, calcium carbonate, sodium sulfate, fly ash, bentonite, triethanolamine, sodium benzoate and aluminum sulfate. According to weight ratio, each part of the rock and soil solidifying agent comprises 20 to 40 parts of the cement, 2 to 8 parts of the polyvinyl alcohol, 1 to 3 parts of the nano silicon dioxide, 5 to 15 parts of the calcium carbonate, 1 to 3 parts of the sodium sulfate, 10 to 30 parts of the fly ash, 5 to 15 parts of the bentonite, 3 to 8 parts of the triethanolamine, 5 to 15 parts of the sodium benzoate and 2 to 5 parts of the aluminum sulfate.

[0026] Preferably, by weight, each portion contains 30 parts of the cement, 5 parts of the polyvinyl alcohol, 2 parts of the nano-silicon dioxide, 10 parts of the calcium carbonate, 2 parts of the sodium sulfate, 20 parts of the fly ash, 10 parts of the bentonite, 5 parts of the triethanolamine, 10 parts of the sodium benzoate, and 3 parts of the aluminum sulfate.

[0027] The preparation method of the rock and soil curing agent of the present invention comprises the following steps:

[0028] S1: Cement pretreatment: The cement was dried in an oven at 60 °C for 2 h to remove excess moisture;

[0029] S2: Dissolution of polymer: Add polyvinyl alcohol to deionized water, heat to 40°C and stir until completely dissolved;

[0030] S3: Nano-silica dispersion: Add nano-silica to the above solution and treat it with an ultrasonic disperser for 20 minutes to ensure uniform dispersion;

[0031] S4: Mixing calcium carbonate and sodium sulfate: Mix calcium carbonate and sodium sulfate evenly, and then dry at 100°C for 1 hour;

[0032] S5: Mixing fly ash and bentonite: The fly ash and bentonite were mixed and ground in a ball mill for 20 minutes to increase their specific surface area;

[0033] S6: Mixing cosolvent and preservative: Add triethanolamine and sodium benzoate into deionized water and stir until completely dissolved;

[0034] S7: curing accelerator treatment: dissolve aluminum sulfate in an appropriate amount of deionized water for later use;

[0035] S8: Mixing and stirring: Mix all the processed raw materials except aluminum sulfate in a high-speed mixer, and control the stirring speed at 200 rpm for 20 minutes;

[0036] S9: Solidification: Before use, add aluminum sulfate to the mixed mixture, stir well and wait for solidification.

[0037] Example 1

[0038] According to the ratio range given in claim 1, the following ratio is selected for implementation:

[0039] Cement: 30 parts

[0040] Polyvinyl alcohol: 5 parts

[0041] Nano silicon dioxide: 2 parts

[0042] Calcium carbonate: 10 parts

[0043] Sodium sulfate: 2 parts

[0044] Fly ash: 20 parts

[0045] Bentonite: 10 parts

[0046] Triethanolamine: 5 parts

[0047] Sodium benzoate: 10 parts

[0048] Aluminum sulfate: 3 parts

[0049] Preparation steps:

[0050] Cement pretreatment: The cement was dried in an oven at 60 °C for 2 h.

[0051] Polymer dissolution: Add polyvinyl alcohol to deionized water, heat to 40°C and stir until completely dissolved.

[0052] Nano-silica dispersion: Add nano-silica to the above solution and treat it using an ultrasonic disperser for 20 minutes.

[0053] Mixing calcium carbonate and sodium sulfate: Mix calcium carbonate and sodium sulfate evenly, and then dry at 100℃ for 1 hour.

[0054] Mixing of fly ash and bentonite: Fly ash and bentonite were mixed and ground in a ball mill for 20 minutes.

[0055] Co-solvent and preservative mixing: Add triethanolamine and sodium benzoate to deionized water and stir until completely dissolved.

[0056] Curing accelerator treatment: dissolve aluminum sulfate in an appropriate amount of deionized water and set aside.

[0057] Mixing and stirring: Mix all the processed raw materials except aluminum sulfate in a high-speed mixer until uniformly mixed. The stirring speed is controlled at 200 rpm for 20 minutes.

[0058] Solidification: Before use, add aluminum sulfate to the mixed mixture, stir well and wait for solidification.

[0059] Example 2

[0060] According to the ratio range given in claim 1, the following ratio is selected for implementation:

[0061] Cement: 35 parts

[0062] Polyvinyl alcohol: 6 parts

[0063] Nano silicon dioxide: 2.5 parts

[0064] Calcium carbonate: 12 parts

[0065] Sodium sulfate: 2.5 parts

[0066] Fly ash: 25 parts

[0067] Bentonite: 12 parts

[0068] Triethanolamine: 6 parts

[0069] Sodium benzoate: 12 parts

[0070] Aluminum sulfate: 4 parts

[0071] Preparation steps:

[0072] Cement pretreatment: The cement was dried in an oven at 60 °C for 2 h.

[0073] Polymer dissolution: Add polyvinyl alcohol to deionized water, heat to 40°C and stir until completely dissolved.

[0074] Nano-silica dispersion: Add nano-silica to the above solution and treat it using an ultrasonic disperser for 20 minutes.

[0075] Mixing calcium carbonate and sodium sulfate: Mix calcium carbonate and sodium sulfate evenly, and then dry at 100℃ for 1 hour.

[0076] Mixing of fly ash and bentonite: Fly ash and bentonite were mixed and ground in a ball mill for 20 minutes.

[0077] Co-solvent and preservative mixing: Add triethanolamine and sodium benzoate to deionized water and stir until completely dissolved.

[0078] Curing accelerator treatment: dissolve aluminum sulfate in an appropriate amount of deionized water and set aside.

[0079] Mixing and stirring: Mix all the processed raw materials except aluminum sulfate in a high-speed mixer until uniformly mixed. The stirring speed is controlled at 200 rpm for 20 minutes.

[0080] Solidification: Before use, add aluminum sulfate to the mixed mixture, stir well and wait for solidification.

[0081] In two embodiments of the present invention, we explored the effects of different proportions on the performance of geotechnical solidifying agents. The following is a specific comparison of the two embodiments:

[0082] Comparison of raw material ratio

[0083] Cement: Example 1: 30 parts, Example 2: 35 parts

[0084] Polyvinyl alcohol: Example 1: 5 parts, Example 2: 6 parts

[0085] Nano silicon dioxide: Example 1: 2 parts, Example 2: 2.5 parts

[0086] Calcium carbonate: Example 1: 10 parts, Example 2: 12 parts

[0087] Sodium sulfate: Example 1: 2 parts, Example 2: 2.5 parts

[0088] Fly ash: Example 1: 20 parts, Example 2: 25 parts

[0089] Bentonite: Example 1: 10 parts, Example 2: 12 parts

[0090] Triethanolamine: Example 1: 5 parts, Example 2: 6 parts

[0091] Sodium benzoate: Example 1: 10 parts, Example 2: 12 parts

[0092] Aluminum sulfate: Example 1: 3 parts, Example 2: 4 parts

[0093] Preparation process comparison:

[0094] The preparation processes of the two embodiments are basically the same, and both follow the following steps: cement pretreatment, high molecular polymer dissolution, nano-silicon dioxide dispersion, calcium carbonate and sodium sulfate mixing, fly ash and bentonite mixing, co-solvent and preservative mixing, curing accelerator treatment, mixing and stirring, curing

[0095] Performance Expectation Comparison:

[0096] Since the proportion of most raw materials in Example 2 is slightly higher than that in Example 1, we can expect that the curing agent of Example 2 may have the following characteristics:

[0097] Faster curing speed: Since the ratio of aluminum sulfate in Example 2 is slightly higher, this may promote a faster curing reaction.

[0098] Improved mechanical properties: Higher cement and nanosilica contents may help improve the compressive and flexural strength of the curing agent.

[0099] Better durability: Higher calcium carbonate and bentonite content may enhance the durability of the hardener, making it more resistant to environmental factors.

[0100] Stronger bonding performance: Higher polyvinyl alcohol and triethanolamine content may improve the bonding performance of the curing agent to the rock and soil.

[0101] Higher cost: Since the proportion of most raw materials in Example 2 is higher, the overall cost of the curing agent may be slightly higher than that of Example 1.

[0102] in conclusion:

[0103] The main difference between the two embodiments is the ratio of raw materials, which may affect the performance and cost of the curing agent. Embodiment 2 is expected to have better performance due to the higher raw material ratio, but the cost is also relatively high. In practical applications, the most suitable ratio scheme can be selected according to specific engineering requirements and cost budget. Further performance tests and field trials will help to verify these expected differences and optimize the formula of the curing agent.

[0104] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A rock and soil solidifying agent, characterized in that: The invention comprises cement, polyvinyl alcohol, nano silicon dioxide, calcium carbonate, sodium sulfate, fly ash, bentonite, triethanolamine, sodium benzoate and aluminum sulfate; by weight, each portion contains 20 to 40 portions of cement, 2 to 8 portions of polyvinyl alcohol, 1 to 3 portions of nano silicon dioxide, 5 to 15 portions of calcium carbonate, 1 to 3 portions of sodium sulfate, 10 to 30 portions of fly ash, 5 to 15 portions of bentonite, 3 to 8 portions of triethanolamine, 5 to 15 portions of sodium benzoate and 2 to 5 portions of aluminum sulfate.

2. The soil solidifying agent according to claim 1, characterized in that: By weight ratio, each portion contains 30 portions of cement, 5 portions of polyvinyl alcohol, 2 portions of nano-silicon dioxide, 10 portions of calcium carbonate, 2 portions of sodium sulfate, 20 portions of fly ash, 10 portions of bentonite, 5 portions of triethanolamine, 10 portions of sodium benzoate, and 3 portions of aluminum sulfate.

3. A method for preparing the rock and soil solidifying agent as claimed in claim 1, characterized in that: The following steps are involved: S1: Cement pretreatment: The cement was dried in an oven at 60 °C for 2 h to remove excess moisture; S2: Dissolution of polymer: Add polyvinyl alcohol to deionized water, heat to 40°C and stir until completely dissolved; S3: Nano-silica dispersion: Add nano-silica to the above solution and treat it with an ultrasonic disperser for 20 minutes to ensure uniform dispersion; S4: Mixing calcium carbonate and sodium sulfate: Mix calcium carbonate and sodium sulfate evenly, and then dry at 100°C for 1 hour; S5: Mixing fly ash and bentonite: The fly ash and bentonite were mixed and ground in a ball mill for 20 minutes to increase their specific surface area; S6: Mixing cosolvent and preservative: Add triethanolamine and sodium benzoate into deionized water and stir until completely dissolved; S7: curing accelerator treatment: dissolve aluminum sulfate in an appropriate amount of deionized water for later use; S8: Mixing and stirring: Mix all the processed raw materials except aluminum sulfate in a high-speed mixer, and control the stirring speed at 200 rpm for 20 minutes; S9: Solidification: Before use, add aluminum sulfate to the mixed mixture, stir well and wait for solidification.