Super-early-strength and super-high-strength inorganic grouting material based on ordinary Portland cement and preparation method of grouting material

Abstract

The invention discloses a super-early-strength and super-high-strength inorganic grouting material based on ordinary Portland cement and a preparation method of the grouting material. The grouting material comprises the following components in parts by weight: 300-500 parts of ordinary Portland cement, 10-50 parts of silica fume, 400-600 parts of fine aggregate, 50-200 parts of a rapid hardening agent, 3-15 parts of a water reducing agent, 0.1-5 parts of a water-retaining agent and 0.1-5 parts of a defoaming agent. The rapid hardening agent comprises the following components in parts by weight: 20-100 parts of calcium aluminate mineral, 5-50 parts of anhydrous gypsum and 1-50 parts of light calcined magnesia. The calcium aluminate mineral is selected from one or more of anhydrous calcium sulphoaluminate mineral, calcium fluoroaluminate mineral, calcium aluminoferrite mineral, monocalcium aluminate and dodecacalcium heptaaluminate. The super-early-strength inorganic grouting material provided by the invention has ultrahigh hour strength while meeting workability, and the early strength of the grouting material is greatly improved; and the ordinary Portland cement and the anhydrite are used as basic raw materials, so that the material cost is low, and production and popularization are easy.

Description

technical field [0001] The invention relates to the technical field of grouting materials, in particular to a super-early-strength and ultra-high-strength inorganic grouting material based on ordinary Portland cement and a preparation method thereof. Background technique [0002] Cement-based non-shrinkage grouting material has the characteristics of good fluidity, fast hardening, high strength, micro-expansion, non-toxic, non-aging, pollution-free, rust-proof, and convenient construction. It is widely used in anchor bolts, nuclear power equipment, and equipment foundations. Secondary grouting, reinforcement and reconstruction of reinforced concrete structures, crack treatment of old concrete structures, etc. Moreover, the steel grouting sleeve connection technology used in the prefabricated buildings vigorously promoted in my country at this stage requires the grouting material to have super early strength, high flow and micro-expansion properties; the repair of the airport...

AI Technical Summary

Problems solved by technology

Moreover, the steel grouting sleeve connection technology used in the prefabricated buildings vigorously promoted in my country at this stage requires the grouting material to have super early strength, high flow and micro-expansion properties; the repair of the airport runway is difficult to adapt to the opening of traffic after 24 hours Economic development, and the application of super early strength cement-based grouting materials can shorten the opening time of traffic, generally require its 8-hour compressive strength not less than 20MPa; when there are special requirements, its 2-hour compressive strength not less than 20MPa

[0003] The preparation of super-early-strength cement-based grouting materials in the prior art is concentrated in the following three ways: one is to use Portland cement as the main cementitious material, and add other admixtures and mineral admixtures for modification. The cost of such grouting materials It is relatively low and widely used, but its early strength is low and its volume shrinks greatly in the later stage; the second is to use sulphoaluminate mineral cement and aluminate mineral cement as cementitious materials. This kind of grouting material sets quickly, has high early strength and slightly expands , but the production cost is high, and the strength will decrease in the later stage; the third is to compound Portland cement with sulphoaluminate mineral cement or aluminate mineral cement, and add other admixtures to modify it. This kind of grouting material has high early strength , slight expansion and stable strength in the later stage, but the raw material composition is complex, the proportion needs to be adjusted frequently, and the applicability is poor

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