Environment-friendly dust collection limestone powder shield grouting material and green preparation method thereof
By combining dust-collecting limestone powder as cementitious materials with other materials to form an environmentally friendly shield grouting material, the shortcomings of traditional grouting materials in environmental protection and resource utilization are solved, and efficient utilization of resources and improvement of construction performance are achieved.
Patent Information
- Application Number
- CN202510076836.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-04-29
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional shield grouting materials have shortcomings in environmental protection and resource utilization, and the supply stability and environmental impact of fly ash are great, while dust-collecting limestone powder has not been effectively utilized.
Environmentally friendly dust-receiving limestone powder is used as the cementitious material, combined with cement, fly ash, fine sand, bentonite, water retention agent and auxiliary agent, and slurry is formed through mixing and stirring, which is used for shield structure synchronous grouting.
The resource recycling and utilization of dust-collecting limestone powder has been realized, the use of fly ash has been reduced, the cost has been saved, and the requirements for grouting material performance in shield construction have been met.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of shield tunneling, in particular to an environmentally friendly dust-collecting limestone powder shield tunneling grouting material and a green preparation method thereof. Background Art
[0002] In the shield construction process, synchronous grouting is a key link, the purpose of which is to fill the annular gap formed after the shield machine excavates, prevent the deformation of the stratum, and ensure the stability and safety of the tunnel. Traditional shield grouting materials usually use cement, fly ash and other materials as cementitious materials. However, with the increasing environmental protection requirements and the enhancement of resource conservation awareness, traditional shield grouting materials have some shortcomings.
[0003] On the one hand, the large-scale use of fly ash depends on the supply of industries such as thermal power generation, and its supply stability may be affected. In addition, the production and transportation of fly ash will also impose a certain burden on the environment. On the other hand, the aggregate production line will produce a large amount of dust-collecting limestone powder during the production of aggregates. These dust-collecting limestone powders are usually treated as waste, which not only occupies a large amount of storage space, but also causes a waste of resources.
[0004] Therefore, it is of great practical significance to develop an environmentally friendly shield grouting material and a preparation method thereof which can effectively utilize dust-collected limestone powder, reduce the amount of fly ash, and at the same time ensure the performance of the shield grouting material. Summary of the invention
[0005] The purpose of the present invention is to provide an environmentally friendly dust-collecting limestone powder shield grouting material and a green preparation method thereof, so as to realize resource recycling of dust-collecting limestone powder, reduce the amount of fly ash used on site, save costs, and at the same time meet the requirements of shield construction for grouting material performance.
[0006] In order to achieve the above object, the present invention adopts the following technical means: An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0007] Preferably, in parts by weight, the cement comprises 130-190 parts, the fly ash comprises 200-300 parts, the fine sand comprises 300-400 parts, the bentonite comprises 60-80 parts, the water retaining agent comprises 7-10 parts, the auxiliary agent comprises 5-10 parts, and the dust collecting limestone powder comprises 270-350 parts.
[0008] More preferably, in parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0009] Preferably, the auxiliary agent is composed of calcium β-hydroxy-β-methylbutyrate, sodium lauryl sulfate, sodium benzoate and diisopropylethylamine in a mass ratio of 1:1:2:4.
[0010] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; Furthermore, the cement, the fly ash, the fine sand, the bentonite, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a shield synchronous grouting material.
[0011] Furthermore, in parts by weight, the cement is 130-190 parts, the fly ash is 200-300 parts, the fine sand is 300-400 parts, the bentonite is 60-80 parts, the water retaining agent is 7-10 parts, the auxiliary agent is 5-10 parts, and the dust collecting limestone powder is 270-350 parts.
[0012] Furthermore, in parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0013] The beneficial effects of the present invention are: The present invention uses the dust-collected limestone powder generated in the aggregate production process of the aggregate production line as a cementing material in the shield grouting material, realizes the resource recycling of waste, reduces the pressure on the environment, and reduces the dependence on resources; by increasing the use of dust-collected limestone powder, the amount of fly ash is reduced, and since the cost of dust-collected limestone powder is relatively low, the preparation cost of the shield grouting material is effectively saved; and through reasonable formula design and preparation method, the environmentally friendly dust-collected limestone powder shield grouting material of the present invention can meet the performance requirements of synchronous grouting material during shield construction. The present invention improves the strength and stability of the grouting material by adding an additive. DETAILED DESCRIPTION
[0014] In order to more clearly present the purpose, technical solutions and advantages of the embodiments of the present invention, the following will closely combine the embodiments of the present invention to clearly explain the technical solutions therein. It should be clear that the embodiments described here are only part of the many embodiments of the present invention, not all.
[0015] The cement used in this application is Portland cement with a strength grade of not less than 42.5; The water retaining agent is a commonly used water retaining agent, such as cellulose ether polymer compounds.
[0016] Example 1 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0017] In parts by weight, the cement is 120 parts, the fly ash is 290 parts, the bentonite is 60 parts, the fine sand is 330 parts, the water retaining agent is 8 parts, the auxiliary agent is 5 parts, and the dust collecting limestone powder is 300 parts.
[0018] The auxiliary agent is composed of calcium beta-hydroxy-beta-methylbutyrate, sodium lauryl sulfate, sodium benzoate and diisopropylethylamine in a mass ratio of 1:1:2:4.
[0019] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0020] In this embodiment, cement generates bonding force through hydration reaction, firmly bonds other components together, and forms a material with certain strength, durability and impermeability. Fly ash can improve workability, and its active ingredients also participate in secondary hydration reaction to improve later strength and impermeability. Dust-collected limestone powder can fill the gaps between particles to optimize gradation and improve workability. Bentonite uses its water absorption to expand when it comes into contact with water to fill the voids and reduce sedimentation, while increasing the consistency and viscosity to improve workability and facilitate pumping. Fine sand acts as a skeleton to increase the strength and stability of the grouting material. Water-retaining agent helps to maintain moisture in the grouting material and improve its working performance. The addition of additives is more conducive to improving the performance of the grouting material. This embodiment ensures that the grouting material has good comprehensive performance while realizing the resource utilization of dust-collected limestone powder through reasonable raw material selection and proportioning, as well as a specific preparation process.
[0021] Example 2 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0022] In parts by weight, the cement is 150 parts, the fly ash is 240 parts, the bentonite is 80 parts, the fine sand is 310 parts, the water retaining agent is 10 parts, the auxiliary agent is 6 parts, and the dust collecting limestone powder is 320 parts.
[0023] The auxiliary agent is composed of calcium beta-hydroxy-beta-methylbutyrate, sodium lauryl sulfate, sodium benzoate and diisopropylethylamine in a mass ratio of 1:1:2:4.
[0024] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0025] In this embodiment, cement generates bonding force through hydration reaction, firmly bonds other components together, and forms a material with certain strength, durability and impermeability. Fly ash can improve workability, reduce cement dosage to reduce hydration heat, and its active ingredients also participate in secondary hydration reaction to improve later strength and impermeability. Dust-collected limestone powder can fill the gaps between particles to optimize gradation and improve workability. Bentonite uses its water absorption to expand when it meets water to fill the voids and reduce sedimentation, while increasing the consistency and viscosity to improve workability and facilitate pumping. Fine sand acts as a skeleton to increase the strength and stability of the grouting material. Water-retaining agent helps to maintain moisture in the grouting material and improve its working performance. The addition of additives is more conducive to the improvement of the performance of the grouting material. This embodiment ensures that the grouting material has good comprehensive performance while realizing the resource utilization of dust-collected limestone powder through reasonable raw material selection and proportioning, as well as a specific preparation process.
[0026] Example 3 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0027] In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0028] The auxiliary agent is composed of calcium beta-hydroxy-beta-methylbutyrate, sodium lauryl sulfate, sodium benzoate and diisopropylethylamine in a mass ratio of 1:1:2:4.
[0029] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0030] In this embodiment, cement generates bonding force through hydration reaction, firmly bonds other components together, and forms a material with certain strength, durability and impermeability. Fly ash can improve workability, reduce cement dosage to reduce hydration heat, and its active ingredients also participate in secondary hydration reaction to improve later strength and impermeability. Dust-collected limestone powder can fill the gaps between particles to optimize gradation and improve workability. Bentonite uses its water absorption to expand when it meets water to fill the voids and reduce sedimentation, while increasing the consistency and viscosity to improve workability and facilitate pumping. Fine sand acts as a skeleton to increase the strength and stability of the grouting material. Water-retaining agent helps to maintain moisture in the grouting material and improve its working performance. The addition of additives is more conducive to the improvement of the performance of the grouting material. This embodiment ensures that the grouting material has good comprehensive performance while realizing the resource utilization of dust-collected limestone powder through reasonable raw material selection and proportioning, as well as a specific preparation process.
[0031] Comparative Example 1 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0032] In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0033] The auxiliary agent is composed of calcium formate, sodium lauryl sulfate and triethanolamine in a mass ratio of 1:2:4.
[0034] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0035] Comparative Example 2 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0036] In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0037] The auxiliary agent is composed of calcium beta-hydroxy-beta-methylbutyrate, sodium lauryl sulfate and diisopropylethylamine in a mass ratio of 1:3:4.
[0038] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0039] Comparative Example 3 An environmentally friendly dust-collecting limestone powder shield grouting material comprises cement, fly ash, fine sand, bentonite, a water-retaining agent, an auxiliary agent and the dust-collecting limestone powder as a cementitious material.
[0040] In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
[0041] The auxiliary agent is composed of calcium formate, sodium dodecyl sulfate and diisopropylethylamine in a mass ratio of 1:3:4.
[0042] A method for green preparation of shield grouting material based on environmentally friendly dust-collecting limestone powder, using the environmentally friendly dust-collecting limestone powder described above to green prepare shield grouting material; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the bentonite, the fine sand, the water retaining agent, the auxiliary agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material.
[0043] Examples 1 to 3 and comparative examples 1 to 3 were tested respectively, and the test results are shown in Table 1 below.
[0044] Each sample was cured in a constant temperature environment, and then its 3d and 28d flexural strength and compressive strength were measured according to the test method of "Technical Code for Application of Premixed Shield Grouting Materials".
[0045] Table 1 is the product performance parameters of the embodiments and comparative examples The test shows that the compressive strength of the grouting material of the present application is greatly improved compared with the performance of the comparative example.
[0046] The environmentally friendly dust-collecting limestone powder shield grouting material and the green preparation method thereof provided by the present invention have significant application value. By rationally applying the dust-collecting limestone powder of the aggregate production line to the shield grouting material, efficient resource utilization of waste is achieved. Under the premise of ensuring the quality of shield construction, the amount of fly ash used is greatly reduced, the cost is effectively saved, and the resource utilization efficiency is improved.
Claims
1. An environmentally friendly dust-collecting limestone powder shield grouting material, characterized in that: It includes cement, fly ash, fine sand, bentonite, water retaining agent, additives and dust-collecting limestone powder as a cementitious material.
2. The environmentally friendly dust-collecting limestone powder shield grouting material according to claim 1, characterized in that: In parts by weight, the cement comprises 130 to 190 parts, the fly ash comprises 200 to 300 parts, the fine sand comprises 300 to 400 parts, the bentonite comprises 60 to 80 parts, the water retaining agent comprises 7 to 10 parts, the auxiliary agent comprises 5 to 10 parts, and the dust collecting limestone powder comprises 270 to 350 parts.
3. The environmentally friendly dust-collecting limestone powder shield grouting material according to claim 2, characterized in that: In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.
4. The environmentally friendly dust-collecting limestone powder shield grouting material according to claim 2, characterized in that: The auxiliary agent is composed of calcium beta-hydroxy-beta-methylbutyrate, sodium lauryl sulfate, sodium benzoate and diisopropylethylamine in a mass ratio of 1:1:2:
4.
5. A method for green preparation of shield grouting material based on environmentally friendly limestone powder, characterized in that: Adopting the environmentally friendly dust-collecting limestone powder described in any one of claims 1 to 4 for green production of shield mortar; The environmentally friendly dust-collecting limestone powder is the dust-collecting limestone powder generated during the aggregate production line's aggregate production process; The cement, the fly ash, the fine sand, the bentonite, the water retaining agent and the dust-collected limestone powder as a cementitious material are mixed and stirred with water to form a slurry, and the slurry is used as a synchronous grouting material for shield tunneling.
6. The method for green production of shield grouting material using an environmentally friendly dust-collecting limestone powder according to claim 5, characterized in that: The cement, the fly ash, the dust-collecting limestone powder, the fine sand, the bentonite, the water-retaining agent and the auxiliary agent are mixed to form a dry powder, and then the dry powder is mixed with water to prepare shield grouting material.
7. The method for green production of shield grouting material using an environmentally friendly dust-collecting limestone powder according to claim 5 or 6, characterized in that: In parts by weight, the cement comprises 130 to 190 parts, the fly ash comprises 200 to 300 parts, the fine sand comprises 300 to 400 parts, the bentonite comprises 60 to 80 parts, the water retaining agent comprises 7 to 10 parts, the auxiliary agent comprises 5 to 10 parts, and the dust collecting limestone powder comprises 270 to 350 parts.
8. The method for green preparation of shield grouting material by using environmentally friendly dust-collecting limestone powder according to claim 7, characterized in that: In parts by weight, the cement is 140 parts, the fly ash is 260 parts, the bentonite is 70 parts, the fine sand is 320 parts, the water retaining agent is 9 parts, the auxiliary agent is 8 parts, and the dust collecting limestone powder is 310 parts.