Efficient superfine cement based composite grouting material for grouting treatment of water-rich sand layer, preparation process and application

Abstract

The invention discloses an efficient superfine cement based composite grouting material for grouting treatment of a water-rich sand layer, a preparation process and application. The efficient superfine cement based composite grouting material is prepared from the following components in parts by weight: 40 to 80 parts of portland cement clinker, 10 to 45 parts of coal ash, 5 to 30 parts of superfine slag micro powder, 2 to 6.5 parts of desulphurization gypsum, 1 to 10 parts of silica fume, 0.51 to 2.10 parts of first mixed composite modifier, 0.4 to 2.4 parts of second mixed composite modifierand 5.5 to 8.9 parts of third mixed composite modifier; the coal ash is prepared from the following components in parts by weight: 50 to 100 parts of high-calcium coal ash and 0 to 50 parts of low-calcium coal ash; the first mixed composite modifier is prepared from the following components in parts by weight: 96 to 99 parts of super plasticizer and 1 to 4 parts of hydroxypropyl methyl cellulose;the second mixed composite modifier is prepared from the following components in parts by weight: 20 to 32 parts of sodium hydroxide, 21 to 28 parts of sodium carbonate, 18 to 32 parts of sodium sulfate and 18 to 36 parts of sodium metaaluminate; the third mixed composite modifier is prepared from the following components in parts by weight: 12 to 25 parts of calcium chloride, 8 to 21 parts of lithium chloride, 10 to 23 parts of triethanolamine and 32 to 68 parts of sulphoaluminate cement clinker.

Description

technical field [0001] The invention belongs to the technical field of grouting and water blocking reinforcement, and relates to a high-efficiency ultra-fine cement-based grouting material and its preparation process, in particular to a grouting material suitable for water-rich fine sand layers, water-rich powder fine sand soil layers, and quicksand layers. A new type of high-efficiency ultra-fine cement-based composite grouting material for grout treatment, its preparation process and application. Background technique [0002] There are more and more projects such as tunnels, subways, water conservancy and hydropower and mines in our country, and the geological conditions faced in the construction of various projects are becoming increasingly complex. Among them, the water-rich sandy soil layer and quicksand layer are prone to major geological disasters such as water gushing and sand collapse and landslides due to their strong water-richness, loose and broken structure, poo...

AI Technical Summary

Problems solved by technology

Chemical grouting materials have high injectability, but their price is high, the formula is complex, pollute the environment, corrosion resistance and durability are poor, and most chemical grouting materials have certain toxicity to groundwater. The development and application of such materials are greatly affected. limit

Ordinary cement materials are difficult to inject into the coarse sand layer and medium-fine sand layer with high fine particle content, the percolation effect is obvious, the setting time is long, the dispersion resistance in water is poor, and the volume of the slurry shrinks after hardening, so it is difficult to realize the water-rich sand layer blocking and strengthening

Quick-setting cement materials such as cement-sodium silicate and other slurry are difficult to penetrate and diffuse effectively, and the stone body has poor water corrosion resistance and durability, and the strength may shrink in the later stage

In addition, the above three materials did not fully consider the water content, soil content, sand fineness, material particle size distribution, durability, environmental protection and engineering economy of the water-rich sand layer during the grouting treatment of the water-rich sand layer. Cost and other requirements for grouting materials, the application effect is not ideal

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