Ultra-early-strength cement-based grouting material and production method thereof

Abstract

The invention relates to an ultra-early-strength cement-based grouting material. The grouting material comprises sulphoaluminate cement, gypsum dihydrate, a shrinkage reducing agent, a water reducingagent, a retarder and quartz sand. The beneficial effects of the grouting material are as follows: the grouting material can be rapidly coagulated under normal temperature conditions, an initial coagulation time is 5-10 min, and a final coagulation time is 10-15 min; the cement-based grouting material has good fluidity, and an initial flow degree of mortar is 340-380 mm; the cement-based groutingmaterial has excellent mechanical properties, the 2 h compressive strength is 20-35 MPa, and the 28 d compressive strength is 80-100 MPa; the 28 d vertical expansion rate of the cement-based groutingmaterial is 0.1%-0.5%; and a controllable interval of the proportion of the cement-based grouting material is large, and ultra-early strength, high flow, micro-expansion, stable later-stage strength,strong applicability and the like of the cement-based grouting material are realized.

Description

technical field [0001] The invention relates to the technical field of cement concrete application, in particular to a super-early-strength cement-based grouting material and a production method thereof. Background technique [0002] Cement-based grouts can meet specific strength needs within a few hours, so they play an important role in construction projects. The steel grouting sleeve connection technology used in the prefabricated buildings vigorously promoted in our country requires the grouting material to have super early strength, high flow and micro-expansion properties; the repair of the airport runway, it is difficult to adapt to the economic development after 24 hours of opening traffic , and the application of ultra-early-strength cement-based grouting materials can shorten the time for traffic opening. Generally, its 8-hour compressive strength is not less than 20MPa. When there are special requirements, its 2-hour compressive strength is not less than 20MPa. ...

AI Technical Summary

Problems solved by technology

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

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