Grouting material for connecting steel bars in low temperature environment, and preparation method and application thereof

Abstract

The invention discloses a grouting material for connecting steel bars in a low temperature environment, and an application thereof. The grouting material for connecting steel bars in the low temperature environment comprises, by weight, 35-55 parts of cement, 5-20 parts of a mineral admixture, 0-30 parts of an early strength component, 30-50 parts of aggregates, 0.1-0.5 part of a water reducer, 0-0.03 part of a plastic expansion agent, 0-0.1 part of an antifoaming agent, 0-0.05 part of a stabilizer, 0-0.05 part of an air entraining agent, 0-1 part of a setting retarder and 0-0.05 part of a setting accelerator. The fluidity of a grouting material mixture prepared after adding 0 DEG C water to the grouting material in a -5 DEG C environment and mixing the grouting material and the water is more than 260 mm 30 min later, so sufficient grouting time at a low temperature is ensured; the grouting material has the characteristics of low water-to-feed ratio and high fluidity, and the groutingmaterial still has an expansion performance and a good low-temperature hydration characteristic in a subzero temperature environment, is suitable for steel bar grouting connection construction in a -10-10 DEG C environment, and solves the problem of grouting construction in the low temperature environment, especially the below 0 DEG C environment; and the grouting material contains no chlorine salt and other early-strength components corroding the steel bars.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a grouting material for connecting steel bars in a low-temperature environment and a preparation method and application thereof. Background technique [0002] 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] The grouting material for steel bar connection is a special high-strength cement-based grouting material, including sleeve grouting material and grouting material for steel bar grouting anchor lap connection. However, the existing grouting materials for steel bar connection are mainly products for normal temperature environment. When the grouting construction environment and the concrete structure are at low temperature or negative temperature, the mixture is poured ...

AI Technical Summary

Problems solved by technology

The increased cost of the heating and heat preservation measures will lead to a lot of cost increase for construction projects, which is not suitable for large-scale applications

[0004] Therefore, grouting materials for steel bar connections used in low-negative temperature environments and their low-temperature performance indicators need to be developed and established