Low-heat high-strength micro-expansion cement-based grouting material

Abstract

The invention belongs to the field of building materials, and discloses a low-heat high-strength micro-expansion cement-based grouting material, which is prepared from the following raw materials in parts by weight: 15-25 parts of Portland cement, 20-40 parts of fly ash, 20-40 parts of granulated blast furnace slag powder, 5-15 parts of limestone powder, 1-3 parts of zeolite powder, 8-12 parts ofexpanding agent, 1.2-1.8 parts of water reducing agent and 20-30 parts of water. High-reliability dense filling and plugging of a large-size building structure in underground engineering can be achieved.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a cement grouting material with low heat of hydration, high strength and micro-expansion, which is mainly used for high-reliability dense filling of large-volume building structures in underground engineering, and plays the role of anti-seepage and plugging role. Background technique [0002] Grouting refers to making high-fluidity slurry from materials with filling and gelling effects, and injecting it into formations or fractures through pressure-feeding equipment to make it gel or solidify, so as to play the role of reinforcement or anti-seepage plugging. Grouting materials are mainly divided into cement grouting materials and chemical grouting materials. Cement grouting material has a wide range of applications due to its advantages of abundant raw material sources, low price and high strength of hardened slurry. However, when conventional cement grouting materials are used ...

AI Technical Summary

Problems solved by technology

However, when conventional cement grouting materials are used for high-reliability dense filling of large-volume structures in underground engineering, there is often an excessive heat of hydration, which causes the temperature rise of the cement slurry to be too high, which in turn leads to cracks inside the hardened cement slurry. Affects the sealing reliability of the filling structure

In addition, in order to achieve high fluidity and low viscosity of conventional cement grouting materials, the water-cement ratio is relatively large, so the hardened cement paste has high porosity, low strength and poor durability.

Finally, the conventional grouting material shrinks greatly after hardening, the seal is not tight, and the reliability is poor