Method for preparing solid waste-based quick-hardening grouting material

Abstract

The invention discloses a method for preparing a solid-waste-based quick-hardening grouting material, which is characterized in that a solid-waste-based cementing material is prepared from solid-waste-based materials such as slag, fly ash, gypsum and the like, so that the high-value utilization of industrial solid waste materials is improved; the strength formation of the grouting material is accelerated by utilizing the synergistic effect of the solid waste materials, the early strength is high, the setting time is short, and the high-performance grouting material is prepared. The solid-waste-based rapid-hardening grouting material has the advantages of high strength, rapid hardening, excellent bonding performance, good impermeability, wide raw material sources, environmental friendliness, adjustable setting time and the like, so that the solid-waste-based rapid-hardening grouting material has a wide application prospect in grouting engineering.

Description

Technical Field

[0001] The invention relates to the technical field of novel building material preparation methods, in particular to a method for preparing a solid waste-based rapid-hardening grouting material. Background Art

[0002] With the rapid development of modern construction industry, especially the continuous advancement of large-scale infrastructure construction such as underground projects, tunnels, highways and bridges, grouting technology has become an indispensable part of engineering. The main purpose of grouting technology is to inject specific slurry materials into soil or rock to improve its mechanical properties and waterproof properties, so as to achieve the purpose of stabilizing the foundation and preventing leakage. Among these grouting materials, fast-hardening grouting materials have received extensive attention and application due to their characteristics of rapid curing, high strength and excellent durability.

[0003] The research and development of fast-hardening grouting materials are closely related to the progress of modern engineering technology. On the one hand, with the increase of large-scale engineering projects and the improvement of engineering quality requirements, traditional grouting materials can no longer meet the needs of some special projects, such as high-speed railway bed grouting and groundwater blocking, which has prompted the birth and development of fast-hardening grouting materials. On the other hand, the continuous emergence of new materials and new technologies has also provided new ideas and methods for the research of fast-hardening grouting materials. In addition, the concepts of environmental protection and sustainable development have also had a profound impact on the research of fast-hardening grouting materials.

[0004] With the development of industry, a large amount of industrial solid waste, such as slag and coal gangue, has been generated. These wastes not only occupy a large amount of land, but may also pollute the environment. Therefore, how to effectively treat and utilize these wastes has become an important environmental issue. At the same time, traditional grouting materials, such as cement-based grouting materials, although they can meet engineering needs to a certain extent, have some problems, such as poor durability, poor injectability, and long maintenance time. Therefore, the research and development of new, environmentally friendly and efficient grouting materials has become an inevitable trend in the development of grouting technology. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, a method for preparing a solid waste-based quick-hardening grouting material is provided, which achieves 1. By preparing solid waste-based cementitious materials using slag, fly ash, gypsum, etc., the high-value utilization of industrial solid waste materials is improved; 2. The synergistic effect between solid waste materials is utilized to accelerate the strength formation of the grouting material, with high early strength and fast setting time, to prepare a high-performance grouting material.

[0006] The technical solution adopted by the present invention is: a method for preparing a solid waste-based rapid hardening grouting material, wherein the solid waste-based materials are mixed and then ground by a ball mill for 15 minutes, and the median particle size D50 of the ground materials is 10 microns;

[0007] Among them, the weight component percentages of the solid waste-based materials are: 10-20 parts of cement, 28-50 parts of mineral powder, 10-15 parts of steel slag, 5-15 parts of gypsum, 5-10 parts of green mud, 5-10 parts of lime slag, 0-2 parts of silica fume, 0.1-0.5 parts of tartaric acid, 0.02-0.06 parts of cellulose ether, 0.2-0.4 parts of high-efficiency water reducing agent, and 0.02-0.05 parts of defoaming agent.

[0008] Furthermore, the cement described in the present invention is sulphoaluminate cement, with a label of PO 42.5. Adding sulphoaluminate cement shortens the setting time and provides early strength.

[0009] Furthermore, the steel slag powder of the present invention meets the activity index and fluidity ratio requirements of first-grade steel powder specified in GB / T 20491-2006 "Steel slag powder for cement and concrete".

[0010] Furthermore, the mineral powder described in the present invention is S95 grade granulated blast furnace slag powder, which meets the activity index and fluidity ratio requirements of S95 grade specified in GB / T18046-2017 "Granulated blast furnace slag powder for cement, mortar and concrete".

[0011] Furthermore, the gypsum described in the present invention is at least one of industrial by-product desulfurized gypsum and phosphogypsum, meeting the requirements of GB / T 21371-2008 "Industrial by-product gypsum used in cement".

[0012] Furthermore, the green mud and lime sludge described in the present invention both contain CaCO3 and silicide, which are derived from waste from the alkali recovery section of a pulp mill.

[0013] Furthermore, the specific surface area of ​​the silica fume of the present invention is 15000-30000m 2 / kg.

[0014] Furthermore, the water reducing agent described in the present invention is a powdered polycarboxylic acid water reducing agent.

[0015] Furthermore, the defoamer described in the present invention is a powdered polyether defoamer.

[0016] Furthermore, the tartaric acid described in the present invention is a powder retarder, and the cellulose ether is a powder water-retaining agent.

[0017] The potential hydraulically active silicon (aluminum) oxygen tetrahedrons in the mineral powder are 2-3 times that of cement clinker. The divalent metal oxides in the steel slag and the desulfurized gypsum synergistically stimulate the water-quenched blast furnace slag to produce the "silicon tetracoordinate isomorphism effect" and "complex salt effect". While forming a large number of nano-diameter needle-rod-shaped complex salt crystals, a large number of nearly amorphous and tightly packed hydrated calcium silicate gels and zeolite-like phases are also formed, and the needle-rod-shaped complex salt crystals are tightly wrapped, so that the entire gelling system has good density, strength, volume stability and resistance to environmental erosion.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. Traditional grouting materials often rely on limited natural resources and may cause certain pollution to the environment. The solid waste-based rapid hardening grouting material of the present invention can use industrial solid waste such as fly ash and slag as raw materials, has a wide range of raw material sources and significant environmental benefits;

[0020] 2. The setting time of traditional grouting materials is fixed, which makes it difficult to meet the complex and changing engineering requirements. The solid waste-based rapid hardening grouting material of the present invention can achieve flexible control of the setting time by adjusting the formula;

[0021] 3. The present invention utilizes the synergistic effect between solid waste-based materials to prepare a quick-hardening grouting material with high strength and good durability. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. The embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example 1

[0024] A method for preparing a solid waste-based rapid hardening grouting material, comprising mixing solid waste-based materials and grinding them in a ball mill for 15 minutes, wherein the median particle size D50 of the ground materials is 10 microns;

[0025] Among them, the weight component percentages of the solid waste-based materials are: 20 parts of cement, 28 parts of mineral powder, 15 parts of steel slag, 15 parts of gypsum, 10 parts of green mud, 10 parts of lime slag, 2 parts of silica fume, 0.1 parts of tartaric acid, 0.02 parts of cellulose ether, 0.2 parts of high-efficiency water reducing agent, and 0.02 parts of defoaming agent.

[0026] Among them, the cement is sulphoaluminate cement with a grade of PO 42.5. The addition of sulphoaluminate cement shortens the setting time and provides early strength.

[0027] The steel slag powder meets the activity index and fluidity ratio requirements of first-grade steel powder specified in GB / T 20491-2006 "Steel slag powder for cement and concrete".

[0028] The mineral powder is S95 grade granulated blast furnace slag powder, which meets the activity index and fluidity ratio requirements of S95 grade specified in GB / T 18046-2017 "Granulated blast furnace slag powder for cement, mortar and concrete".

[0029] The gypsum is at least one of industrial by-product desulfurized gypsum and phosphogypsum, and meets the requirements of GB / T 21371-2008 "Industrial by-product gypsum used in cement".

[0030] Both green mud and lime sludge contain CaCO3 and silicates and are derived from waste from the alkali recovery section of a pulp mill.

[0031] The specific surface area of ​​silica fume is 15000-30000m 2 / kg. The water reducer is a powdered polycarboxylic acid water reducer.

[0032] The defoamer is a powdered polyether defoamer. Tartaric acid is a powdered retarder and cellulose ether is a powdered water retaining agent.

[0033] The potential hydraulically active silicon (aluminum) oxygen tetrahedrons in the mineral powder are 2-3 times that of cement clinker. The divalent metal oxides in the steel slag and the desulfurized gypsum synergistically stimulate the water-quenched blast furnace slag to produce the "silicon tetracoordinate isomorphism effect" and "complex salt effect". While forming a large number of nano-diameter needle-rod-shaped complex salt crystals, a large number of nearly amorphous and tightly packed hydrated calcium silicate gels and zeolite-like phases are also formed, and the needle-rod-shaped complex salt crystals are tightly wrapped, so that the entire gelling system has good density, strength, volume stability and resistance to environmental erosion.

[0034] Example 2

[0035] The weight percentages of the solid waste-based materials are set as follows: 20 parts of cement, 38 parts of mineral powder, 10 parts of steel slag, 15 parts of gypsum, 10 parts of green mud, 5 parts of lime slag, 2 parts of silica fume, 0.3 parts of tartaric acid, 0.04 parts of cellulose ether, 0.3 parts of high-efficiency water reducing agent, and 0.04 parts of defoaming agent. The remaining steps are the same as those in Example 1.

[0036] Example 3

[0037] The weight percentages of the solid waste-based materials are set as follows: 10 parts of cement, 48 parts of mineral powder, 10 parts of steel slag, 10 parts of gypsum, 10 parts of green mud, 10 parts of lime slag, 2 parts of silica fume, 0.3 parts of tartaric acid, 0.06 parts of cellulose ether, 0.3 parts of high-efficiency water reducing agent, and 0.04 parts of defoaming agent. The remaining steps are the same as those in Example 1.

[0038] Example 4

[0039] The weight percentages of the solid waste-based materials are set as follows: 10 parts of cement, 48 parts of mineral powder, 15 parts of steel slag, 15 parts of gypsum, 5 parts of green mud, 5 parts of lime slag, 2 parts of silica fume, 0.5 parts of tartaric acid, 0.02 parts of cellulose ether, 0.2 parts of high-efficiency water reducing agent, and 0.02 parts of defoaming agent. The remaining steps are the same as those in Example 1.

[0040] Comparative Example 1

[0041] The weight percentages of the solid waste-based materials are set as follows: 10 parts of cement, 50 parts of mineral powder, 10 parts of steel slag, 10 parts of gypsum, 10 parts of green mud, 10 parts of lime slag, 0.1 parts of tartaric acid, 0.02 parts of cellulose ether, 0.2 parts of high-efficiency water reducing agent, and 0.02 parts of defoaming agent. The remaining steps are the same as those in Example 1.

[0042] Comparative Example 2

[0043] The weight percentages of the solid waste-based materials are set to: 20 parts of cement, 40 parts of mineral powder, 15 parts of steel slag, 5 parts of hemihydrate gypsum, 10 parts of green mud, 10 parts of lime slag, 0.5 parts of tartaric acid, 0.06 parts of cellulose ether, 0.2 parts of high-efficiency water reducing agent, and 0.05 parts of defoaming agent. The remaining steps are the same as in Example 1.

[0044] The properties of the new solid waste-based rapid hardening grouting material prepared by the present invention are shown in the following table:

[0045]

[0046] It can be seen from Comparative Example 1 and Example 3 that the addition of silica fume can improve the fluidity of the material. Silica fume can effectively improve the fluidity of cement and improve the workability and durability of concrete through its multiple mechanisms of action, such as micro-filling effect, water-reducing effect, and volcanic ash activity. Silica fume can also retain water and prevent segregation and bleeding, which helps maintain the uniformity and fluidity of cement paste.

[0047] It can be seen from Comparative Example 2 and Example 2 that an appropriate amount of water reducing agent can improve the performance of the grouting material, and adding too much water reducing agent will affect the setting time and early strength. The higher the content of chlorite and lime slag is, the better. The main component of chlorite and lime slag is calcium carbonate. The addition of calcium carbonate can change the pore structure of the hardened slurry, increase gel pores and transition pores, and greatly change the pore size distribution, with fewer large pores and more small pores, which are evenly distributed, thereby improving the performance of the hardened slurry.

[0048] It can be seen from Example 4 that a small amount of green mud and lime slag can significantly improve the early compressive strength of the grouting material.

[0049] The solid waste-based rapid hardening grouting material of the present invention has the advantages of high strength and rapid hardening, excellent bonding performance, good anti-seepage performance, wide raw material sources and environmental protection, and adjustable setting time. These advantages are closely related to the purpose of the invention, and the shortcomings of the prior art are significantly improved, so that the solid waste-based rapid hardening grouting material has a wide application prospect in grouting engineering.

Claims

1. A method for preparing a solid waste-based rapid-hardening grouting material, characterized in that: The solid waste-based materials were mixed and ground in a ball mill for 15 minutes, and the median particle size D50 of the ground materials was 10 microns; Among them, the weight component percentages of the solid waste-based materials are: 10-20 parts of cement, 28-50 parts of mineral powder, 10-15 parts of steel slag, 5-15 parts of gypsum, 5-10 parts of green mud, 5-10 parts of lime slag, 0-2 parts of silica fume, 0.1-0.5 parts of tartaric acid, 0.02-0.06 parts of cellulose ether, 0.2-0.4 parts of high-efficiency water reducing agent, and 0.02-0.05 parts of defoaming agent.

2. The method for preparing a solid waste-based rapid hardening grouting material according to claim 1, characterized in that: The cement is sulphoaluminate cement, with the label PO 42.

5.

3. The method for preparing a solid waste-based rapid hardening grouting material according to claim 1, characterized in that: The mineral powder is S95 grade granulated blast furnace slag powder.

4. The method for preparing a solid waste-based rapid hardening grouting material according to claim 1, characterized in that: The gypsum is at least one of industrial by-product desulfurized gypsum and phosphogypsum.

5. The method for preparing a solid waste-based rapid hardening grouting material according to claim 1, characterized in that: The components of the green mud and lime sludge both include CaCO3 and silicide.

6. A method for preparing a solid waste-based rapid hardening grouting material as claimed in claim 1, characterized in that: The specific surface area of ​​the silica ash is 15000-30000m 2 / kg.

7. A method for preparing a solid waste-based rapid hardening grouting material as claimed in claim 1, characterized in that: The water reducing agent is a powdered polycarboxylic acid water reducing agent.

8. The method for preparing a solid waste-based rapid hardening grouting material according to claim 1, characterized in that: The defoamer is a powdered polyether defoamer.

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