Environmentally friendly and efficient grouting agent

Abstract

The invention relates to an environment-friendly high-efficiency grouting agent which is prepared from the following raw materials by weight: 1.6-2.4g of sodium dodecyl sulfate, 0.2-1.0g of methylcellulose, 14-22g of polycarboxylate-type water reducing agent, 134-142g of UEA (Ulex Europaeus Agglutinin) expanding agent, 80-100g of ultra-fine calcium dust and 36-64g of gas dust. The environment-friendly high-efficiency grouting agent is low in cost and better grouting effect.

Description

technical field [0001] The invention relates to a grouting agent, in particular to an environment-friendly and high-efficiency grouting agent. Background technique [0002] In China, the traditional grout used in early prestressed tunnel grouting is generally pure cement slurry. During construction, cement, water, water reducing agent, expansion agent, etc. are used for on-site preparation. 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, vari...

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] At present, most of the grouting agents on the market have complex preparation processes, high dosage and high cost, and most of the product performance has certain defects.

Images