High-performance superfine cement based grouting material for microfissuring and silty fine sand soil grouting treatment and application of grouting material

Abstract

The invention discloses a high-performance superfine cement based grouting material for microfissuring and silty fine sand soil grouting treatment, and application of the grouting material. The grouting material comprises the following ingredients in parts by weight: 50-79 parts of Portland cement clinker, 19-48 parts of an auxiliary cementing material and 2-7 parts of desulfurized gypsum, whereinthe auxiliary cementing material comprises the following ingredients in parts by weight: 25-57 parts of mineral slag, 8-21 parts of steel slag, 18-36 parts of pulverized fuel ash, 6-12 parts of limestone flour, 1-8 parts of silica fume and 2.5-12.8 parts of a high-performance composite regulator; the high-performance composite regulator comprises the following ingredients in parts by weight: 5-16parts of sodium hydroxide, 4-12 parts of sodium silicate, 4-14 parts of potassium metaaluminate, 12-21 parts of calcium chloride, 11-18 parts of lithium chloride, 4-12 parts of triethanolamine, 21-27parts of alum, 18-29 parts of aluminum sulfate, 0.2-1.5 parts of hydroxypropyl methyl cellulose, 0.1-3.0 parts of viscous polymer, 0-0.8 parts of polypropylene fiber and 0.5-3.0 parts of a superplasticizer; and the viscous polymer is an acrylic ester polymer or an ethylene-vinyl acetate copolymer.

Description

technical field [0001] The invention belongs to the technical field of civil engineering grouting and reinforcement, and relates to a high-performance ultrafine cement-based material and its application, in particular to a high-performance ultrafine cement-based composite grouting material for geotechnical engineering grouting and water blocking reinforcement. And the application of the material in micro-cracked rock mass and micro-porous silt fine sand grouting engineering. Background technique [0002] Under the guidance of the "Belt and Road" strategic policy, in different countries and different regions, my country will carry out large-scale construction of tunnels, water conservancy and hydropower, subways, mines, and transportation infrastructure on a large scale. complex. Among them, micro-cracked rock mass, micro-cracked concrete structure, and micro-porous silty sandy soil have disadvantages such as poor injectability, poor bearing capacity, and fragile structure. ...

AI Technical Summary

Problems solved by technology

For micro-cracks and micro-cracks with a width of <0.5mm and silty sand with a particle size of <0.6mm in geotechnical engineering, although chemical grouting materials have high injectability, they are expensive, pollute the environment, have complex formulas, and have poor corrosion resistance. and poor durability, and most chemical grouting materials have certain toxicity to groundwater, so the application of such grouting materials is greatly limited

Although ordinary cement materials are low in cost, rich in sources, good in durability, and easy to use, they also have disadvantages such as ineffective injection, ineffective diffusion, ineffective filling and reinforcement, poor slurry pumping stability, and volume shrinkage of stones. Good grouting effect cannot be guaranteed

Ultra-fine cement has poor water dissolution resistance, poor corrosion resistance, poor rheological properties, low later strength, poor durability and high cost, and cannot meet the requirements of micro-cracked rock mass and micro-porous silt fine sand grouting engineering

In geotechnical engineering, the application effect of the above-mentioned materials is not satisfactory in the grouting process of micro-cracks with a width of less than 0.5 mm and fine sand with a particle size of less than 0.6 mm.

Images