Method for testing aggregation rate of premixed shield grouting material

Abstract

The invention discloses a method for testing the aggregation rate of a premixed shield grouting material. Cement, fly ash, an admixture, bentonite, fine sand, additives and water are included, whereinmain components of the admixture comprise fly ash and granulated blast-furnace slag powder, the bentonite is sodium-based bentonite, and the additives comprise nonionic cellulose ether, a saccharidecompound, a polycarboxylic acid slump retaining agent, starch ether and magnetic hydrotalcite. The method has the benefits as follows: by measuring the aggregation rate of the premixed grouting material with the method, the aggregation time of the grouting material can be controlled in the construction process of synchronous grouting, the product quality is improved, and the product stability is guaranteed.

Description

technical field [0001] The invention relates to the technical field of shield tunneling, in particular to a method for testing the unity rate of ready-mixed shield tunneling grouting materials. Background technique [0002] In the 21st century, the rapid development of China's economy has accelerated the construction of urbanization. With the improvement of urban density and the continuous increase of the number of high-rise buildings, the available space on the surface is getting less and less. The effective use and development of underground space has become the best choice, and the excavation of underground space by shield tunneling method has been used on a large scale, especially in subway projects. During the shield construction process, the diameter of the inner wall of the shield shell is larger than the outer diameter of the segment lining, so as to facilitate the installation of the lining and the construction of the shield curve; the cutting diameter of the shiel...

AI Technical Summary

Problems solved by technology

[0003] At present, subways are being built in many places across the country. On-site mixing is generally used for synchronous grouting in shield construction. There are many problems in on-site mixing, such as uncontrollable mortar quality, segregation and stratification, low solidification rate, and unstable product quality.