Grouting material and preparation method thereof

Abstract

The invention discloses a grouting material which comprises the following components in parts by weight: 94.6-96.7 parts of a cementing material; 0.2 to 0.4 part of a polycarboxylic acid type water reducing agent; 0.02 to 0.04 part of a defoaming agent; 0.01 to 0.03 part of an anti-settling water-retaining agent; 3-5 parts of a concrete expansive agent; 0.03 to 0.05 part of a plastic expanding agent; the cementing material comprises the following components: 82-90 parts of Portland cement; 5-10 parts of silica fume; 1-5 parts of superfine stone powder; and 0-3 parts of fly ash. A preparation method comprises the following steps: (1) mixing limestone with gypsum and a grinding aid, and grinding until the specific surface area is 1000-1500m < 2 > / kg to obtain superfine stone powder, wherein 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 in proportion, adding the materials into mixing equipment, uniformly mixing, and homogenizing to obtain the grouting material. The grouting material disclosed by the invention has excellent flowability, water-retaining property and cohesiveness, improves the compactness and filling degree of the slurry, and reduces the shrinkage of the slurry in a plastic stage and the shrinkage of the hardened slurry.

Description

technical field [0001] The invention relates to the field of prestressed concrete, in particular to a grouting material 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. Prestressed beam pipe grouting, as an extremely important process in post-tensioned structure construction technology, has attracted more and more attention from scholars and engineers. Once there is a quality problem in pipe grouting, it will seriously affect the safety of prestressed structural parts , durability and reliability. [0003] At present, the commonly used grouting material for prestressed beam pipeline 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 preparing ...

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to address the deficiencies in the prior art, to provide a press slurry, which has excellent fluidity, water retention, and cohesiveness, and improves the compactness and filling of the slurry, reducing the size of the slurry in the slurry. The shrinkage in the plastic stage and the shrinkage after hardening of the slurry are especially suitable for the grouting project of the railway concrete post-tensioned prestressed beam pipeline, which can effectively solve the common problems of poor fluidity, large loss of fluidity, and water retention in traditional grouting projects. Poor performance, easy bleeding and delamination, large system shrinkage, low flexural strength, etc.

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