Expansion designable high strength steel pipe concrete and its prepn

Abstract

The present invention is expansion designable C50 and C60 high strength steel pipe concrete and its preparation process, and features that the expansion designable high strength steel pipe concrete is prepared with P.O42.5 or P.O52.5 Portland cement, water, sand, crushed stone, flyash, efficient set retarding water reducing and plasticity keeping agent WUT-G and closed concrete high-energy delayed expanding agent in certain weight proportion. The present invention has lowered concrete air content not higher than 1.5 %, reduced abhesion between steel pipe and concrete caused by air adhesion and sustained stable expansion of kernel concrete.

Description

technical field [0001] The invention belongs to the category of inorganic non-metallic materials, and in particular relates to a high-strength steel pipe concrete and a preparation method thereof. Background technique [0002] Ordinary high-strength steel-filled steel tube concrete used in modern engineering has high core concrete strength, and its strength grade is generally above C40. The hoop effect of concrete is weakened, and the bearing capacity of the structure is reduced. [0003] Although the core concrete in the high-strength steel tube expansive concrete is mixed with an expansion agent, a large amount of water is required for the expansion reaction of the expansion agent used, and the core concrete is in a closed state and cannot be replenished with water. The core concrete only swells in the early stage, and shrinks later due to And debonding from the steel pipe. [0004] The amount of air-entraining admixtures used in the preparation of concrete filled steel ...

AI Technical Summary

Problems solved by technology

[0003] Although the core concrete in the high-strength steel tube expansive concrete is mixed with an expansion agent, a large amount of water is required for the expansion reaction of the expansion agent used, and the core concrete is in a closed state and cannot be replenished with water. The core concrete only swells in the early stage, and shrinks later due to debonding from the steel pipe

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