Grouting agent and preparation method thereof

Abstract

The invention discloses a grouting agent. The grouting agent comprises the following components in parts by weight: 5-12 parts of a polycarboxylic acid water reducer; 0.2 to 0.4 part of a defoaming agent; 0-0.3 part of an anti-settling water-retaining agent; 30-70 parts of a concrete expansive agent; 0.2 to 0.6 part of a plastic expanding agent; 0-30 parts of silica fume; 10 to 50 parts of ultrafine stone powder; 0-20 parts of granulated blast furnace slag powder; and 0-20 parts of fly ash. The grouting agent is prepared by the following steps: 1) mixing limestone with gypsum and a grinding aid, grinding until the specific surface area is 1000-1500m < 2 > / kg to obtain ultra-fine stone powder for later use, the addition amount of the gypsum is 0.3%-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, and the addition amount of the grinding aid is 0.3%-0.5%; and 2) taking the materials according to the ratio, adding the materials into a mixing device, uniformly mixing, and homogenizing to obtain the grouting agent. The grouting agent is used for preparing a grouting material, and can effectively solve the common problems of poor fluidity, large fluidity loss, poor water-retaining property, easy water bleeding and layering, large system shrinkage, low breaking strength and the like existing in prestressed duct grouting engineering.

Description

technical field [0001] The invention relates to the field of prestressed concrete, in particular to a grouting agent and a preparation method thereof. Background technique [0002] With the maturity of prestressed concrete technology, prestressed concrete structural parts have been widely used in construction engineering and bridge engineering. As an extremely important process in the post-tensioned structure construction process, tunnel grouting has attracted more and more attention from scholars and engineers. Once the tunnel grouting has quality problems, it will seriously affect the safety, durability and reliability of prestressed structural parts. sex. [0003] At present, the grouting material used in the commonly used prestressed tunnel grouting is generally pure cement slurry, and raw materials such as cement, water, water reducing agent, and expansion agent are used for on-site preparation during construction. This traditional method of on-site preparation of gro...

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a grouting agent for the deficiencies of the prior art, which is used to prepare grouting materials, which can effectively solve the common problems of prestressed channel grouting projects, such as poor fluidity, large loss of fluidity, poor water retention, It can effectively improve the fluidity, water retention and cohesion of the slurry, improve the compactness and filling of the slurry, and reduce the plasticity of the slurry. Stage shrinkage and shrinkage after hardening of the slurry, improve the flexural and compressive strength of the slurry after hardening, and improve the durability of the slurry

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