Environment-friendly multifunctional grouting agent

Abstract

The invention relates to an environmental-friendly multifunctional grouting agent. The environmental-friendly multifunctional grouting agent is prepared by uniformly mixing the following raw materials by weight: 1.2-2.8g of sodium dodecylbenzene sulfonate, 0.4-0.8g of carboxymethyl cellulose, 16-24g of high-performance water reducing agent powder, 13.2-14.8g of granulated blast furnace slag powder, 37.8-42.6g of steel slag powder, 39.6-44.4g of desulfurization gypsum, 79.4-94.6g of high-calcium pulverized fuel ash and 90-110g of ultra-fine calcium dust. The environment-friendly multifunctional grouting agent is low in cost and convenient for realization of industrial production and has a good grouting effect.

Description

technical field [0001] The invention relates to a grouting agent, in particular to an environment-friendly multifunctional grouting agent. Background technique [0002] In China, the traditional grout used in early prestressed tunnel grouting is generally pure cement slurry, which is prepared on site with cement, water, water reducing agent, and expansion agent during construction. The grouting material prepared on site must meet the following requirements: the water-cement ratio is 0.40~0.45, and an appropriate amount of water reducing agent can be added to reduce the water-cement ratio to a minimum of 0.35; the maximum bleeding rate of the grout should not exceed 3%, and the bleeding should be within Re-absorbed by mortar within 24 hours; the viscosity of the grout should be controlled within 14~18s; the grout should have a certain expansion before solidification; the compressive strength of the test block of the grout should not be lower than 50MPa. Cement, various admix...

AI Technical Summary

Problems solved by technology

Cement, various admixtures and water are used to prepare grout on site, and there are usually problems such as poor compatibility of various admixtures, poor adaptability of cement and water reducer, etc., resulting in the following serious problems in tunnel grouting: (1) Poor quality stability of the slurry, Poor fluidity, fast flow loss, and poor volume stability; (2) The freshly mixed slurry has large bleeding, easy to segregate and stratify, and there are many microfoam in the slurry, poor fluidity, unsuitable coagulation time, and often not when the slurry is pressed. Smooth, easy to block the pipe, slow construction speed, and difficult to make the channel full, etc.; (3) After hardening, the slurry is not dense, there are many air bubbles and needle gaps, the bond with the prestressed tendons is not solid, and there are even fractures in the slurry. Streaks, unsatisfactory pores, powdering of the paste outside the high point, etc.

[0006] However, most of the grouting agents currently on the market have complex preparation processes, high dosage, and high cost. At the same time, most of the product properties have certain defects.

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