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CN-121990803-A - Early-strength cement-based grouting material and preparation method thereof

CN121990803ACN 121990803 ACN121990803 ACN 121990803ACN-121990803-A

Abstract

The invention belongs to the technical field of building materials, and provides an early-strength cement-based grouting material and a preparation method thereof, wherein the early-strength cement-based grouting material comprises, by weight, 500-600 parts of sulphoaluminate cement, 200-300 parts of silicate cement, 40-100 parts of lithium slag, 1-3 parts of a coagulant, 0.5-1 part of an early-strength agent, 5-8 parts of a water reducer, 0.5-2.5 parts of a thickener, 0.3-0.9 part of a defoaming agent and 260-310 parts of water, the coagulant is sodium metaaluminate and/or potassium metaaluminate, and the early-strength agent is one or more than two of lithium carbonate, lithium sulfate, calcium formate, calcium acetate, calcium propionate, calcium butyrate and nano silicon dioxide. Through the technical scheme, the problems of poor dispersivity and low early strength of the cement-based grouting material in a dynamic water environment in the prior art are solved.

Inventors

  • YAN CHUNFU
  • YANG FUMIN
  • TAN ZHENYU
  • NA BING
  • ZHOU GANGMING
  • SUN CHENGXIAO
  • FAN ZHENQING

Assignees

  • 北京铁科首钢轨道技术股份有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The early strength cement-based grouting material is characterized by comprising, by weight, 500-600 parts of sulphoaluminate cement, 200-300 parts of silicate cement, 40-100 parts of lithium slag, 1-3 parts of a coagulant, 0.5-1 part of an early strength agent, 5-8 parts of a water reducer, 0.5-2.5 parts of a thickener, 0.3-0.9 part of a defoaming agent and 260-310 parts of water, wherein the coagulant is sodium metaaluminate and/or potassium metaaluminate, and the early strength agent is one or more than two of lithium carbonate, lithium sulfate, calcium formate, calcium acetate, calcium propionate, calcium butyrate and nano silicon dioxide.
  2. 2. The early strength cement-based grouting material according to claim 1, wherein the thickener is hydroxypropyl methylcellulose and/or bamboo grease thickener CHUPOL NC-1.
  3. 3. The early strength cement-based slip casting material of claim 1, wherein the sulfoaluminate cement is a rapid hardening sulfoaluminate cement having a strength grade of 42.5.
  4. 4. An early strength cement-based slip casting material as claimed in claim 1, wherein the portland cement is portland cement of 42.5 strength grade.
  5. 5. The early-strength cement-based grouting material according to claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent, and the defoaming agent is an organosilicon defoaming agent or a polyether defoaming agent.
  6. 6. An early strength cement-based slip casting material as claimed in claim 1, wherein the setting accelerator is sodium metaaluminate.
  7. 7. The early strength cement-based grouting material according to claim 1, wherein the early strength agent is lithium carbonate and calcium propionate in a mass ratio of 5:3-5.
  8. 8. The early strength cement-based grouting material according to claim 1, wherein the nano silica has a particle size of 10-20nm and a specific surface area of 140-250 m 2/g.
  9. 9. The method for preparing the early-strength cement-based grouting material according to any one of claims 1 to 8, which is characterized by comprising the steps of mixing sulphoaluminate cement, portland cement, lithium slag, a coagulant, an early-strength agent, a water reducing agent, a thickener and a defoaming agent, adding water, and stirring.
  10. 10. The method for preparing an early strength cement-based grouting material according to claim 9, wherein the step of stirring comprises stirring for 30-90s at a rotational speed of 140+ -5 r/min and stirring for 30-90s at a rotational speed of 285+ -10 r/min.

Description

Early-strength cement-based grouting material and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and relates to an early-strength cement-based grouting material and a preparation method thereof. Background Grouting reinforcement technology is a key means for foundation treatment, crack plugging, structural reinforcement, seepage prevention and water stopping in civil engineering. The core is that grout with cementing capacity is injected into stratum or structural crack to form consolidated body after solidification, so as to achieve the purposes of reinforcing and water shutoff. At present, the grouting material commonly adopted in engineering is a double-liquid slurry system which is composed of ordinary Portland cement as a main agent and water glass and other coagulants as auxiliary agents. The material has the advantages of wide sources, high strength, adjustable setting time and the like, and has good performance in conventional still water or low water seepage stratum. However, with the development of projects such as tunnel, dam curtain grouting, water-rich fault fracture zone treatment and the like to more complex geological conditions, construction environments often face serious challenges of water-rich and high-flow-rate water movement conditions, partial areas are accompanied with water pressure which can be kept at 1.5-2.0MPa, under the environments, the traditional cement-based grouting materials have obvious limitations that the grouting effect is poor, slurry is easily dispersed and diluted by water flow flushing, so that effective gelled components are lost, the slurry retention rate and the calculus rate are greatly reduced, and meanwhile, the early strength development of slurry concretes is slow, so that effective water blocking bodies are difficult to form rapidly in the water movement environments. These defects seriously affect the reliability, durability and final water-stopping and reinforcing effects of grouting engineering. In order to solve the problems, the prior art introduces functional additives or improves components and processes in the traditional cement-based material to improve the dispersibility and control the coagulation time, or compounds organic polymer materials to block the flowing water by utilizing the high permeability and quick gel or expansion characteristics of the organic polymer materials, and the invention discloses a flowing water environment dispersion-resistant micro-expansion grouting material and a preparation method thereof, for example, the China application with the application number of CN 120923199A. The grouting material comprises, by weight, 120-160 parts of a pozzolan-characteristic gel material, 3-5 parts of a retarder, 10-15 parts of magnesium oxide, 0.5-2 parts of citric acid, 5-8 parts of aluminum sulfate, 1-2 parts of sodium fluoride, 0.5-1 part of gelatin and 70-100 parts of water, 4-8 parts of polyacrylamide, 5-10 parts of polyacrylic acid derivative salt, 1-2 parts of alcoholic polysaccharide, 40-100 parts of water glass and 30-50 parts of water, and the magnesium oxide, aluminum sulfate, gelatin and sodium fluoride in the component A are prepared into core-shell anti-dispersion particles in advance. The core of the scheme is that the core-shell anti-dispersion particles are prefabricated, the steps are complicated, the requirement on the accuracy of the production process is extremely high, the quality control difficulty and the cost of industrial production are greatly increased, and serious accidents of slurry solidification in advance and pipeline blockage caused by wrong addition position of citric acid occur, so that the method is fragile and low in fault tolerance, and most importantly, performance verification of the underwater grouting material is not performed. Therefore, the development of a cement-based grouting material with excellent water flow dispersion resistance and early strength performance has become an urgent need for solving engineering problems under complex hydrogeological conditions. Disclosure of Invention The invention provides an early-strength cement-based grouting material and a preparation method thereof, and solves the problems of poor dispersivity resistance and low early strength of the cement-based grouting material in a dynamic water environment in the prior art. The technical scheme of the invention is realized as follows: The early-strength cement-based grouting material is characterized by comprising, by weight, 500-600 parts of sulphoaluminate cement, 200-300 parts of Portland cement, 40-100 parts of lithium slag, 1-3 parts of a coagulant, 0.5-1 part of an early-strength agent, 5-8 parts of a water reducer, 0.5-2.5 parts of a thickener, 0.3-0.9 part of a defoaming agent and 260-310 parts of water, wherein the coagulant is sodium metaaluminate and/or potassium metaaluminate, and the early-strength agent is one or more than two of l