High-performance grouting material for prefabricated buildings and preparation method thereof

Abstract

The invention discloses a high-performance grouting material for prefabricated buildings, which comprises the following raw materials in percentage by weight: a composite cementing material: 26-32% ofcement, 3-5% of fly ash, 2-5% of silica powder and 3-5% of slag powder, graded fine sand: 10%-13% of river sand of 20-40 meshes, 23%-30% of river sand of 40-70 meshes, 10%-18% of river sand of 70-140meshes and 2.5%-4.95% of quartz powder, auxiliary agents: 1%-2.5% of a water reducing agent, 0.3%-1.5% of an early strength agent, 0.5%-1.0% of a defoaming agent, 0.47%-3.0% of an expanding agent and0.05%-0.2% of a thickening agent, and a performance regulator: 0.05%-0.2% of a nano modified material and 0.03%-0.1% of a dispersing agent. The high-performance grouting material for prefabricated buildings has the advantages of early strength, quick hardening, quick and stable strength development, high flowability, micro expansion, no shrinkage, high breaking strength and fracture toughness, low cost and the like.

Description

technical field [0001] The invention relates to a building material, in particular to a high-performance grouting material for prefabricated buildings and a preparation method thereof. Background technique [0002] The prefabricated building completes the construction of the building structure through the on-site assembly of prefabricated concrete components, so it has the characteristics of fast construction speed, high labor efficiency, good building quality, and small climate constraints. At present, industrialized buildings with prefabricated concrete structures have formed a trend that will be widely promoted nationwide, but there are many problems in the existing steel grouting connection technology that need to be solved. [0003] As one of the key technical links in the construction of prefabricated buildings, high-performance grouting materials (including sleeve grouting materials and grouting materials for steel grout anchor lap joints) must meet many aspects such ...

AI Technical Summary

Problems solved by technology

[0005] 2) Poor workability, due to the unreasonable gradation design of the fine aggregate, the cohesion of the grouting material is insufficient, and segregation and bleeding are prone to occur during on-site pumping construction;

[0006] 3) It generally has high compressive strength, but the gripping force with the steel bar is poor, the protection against steel bar corrosion is insufficient, the tensile and bending strength is low, and the defects of large shrinkage

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