Method for keeping expansion of steel tube concrete

Abstract

The characteristic is that porous ceramsite light aggregate with grain size 1.5-5 mm, water adsorption 8-12 percent, drum pressure strength 6-12 Mpa is preprocesed by soaking and absorbing water, then to be dried in the shade, the dried porous ceramsite light aggregate is used as fine aggregate to instead of 10-20 percent of sand, the matching ratio of each compound (kg / m3) is water 182, silicate cement 460, UEA expanding agent 55, flyash 60, sand (fineness module is 2.5-3.0) 560, breakstone (continuous graded interval grain size is 5-20 mm) 1033, amidogen sulphonate high-efficiency water-reducing agent 12, which are mixed and stirred to produce C60 steel pipe concrete.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for maintaining continuous and stable expansion of C60 steel pipe concrete. Background technique [0002] Because the steel pipe concrete structure has the characteristics of large bearing capacity, significant economic benefits, beautiful appearance, convenient construction and guaranteed construction quality, so this composite material is more and more widely used in modern building structures. The combination of steel pipes and concrete in steel pipes can give full play to their strengths and obtain excellent mechanical and structural properties. But one of the prerequisites is that the steel pipe wall and the concrete inside must be closely combined, and the steel pipe must have a tight force on the core concrete. In order to achieve this purpose, expansion agents are usually added to concrete components such as Portland cement, coarse and fine aggregat...

AI Technical Summary

Problems solved by technology

However, on the one hand, because the expanded concrete poured into the steel pipe is in a closed environment, external moisture cannot enter to replenish the water consumed due to cement hydration; The water consumption is extremely low, so it is difficult for the expansion agent to function due to the lack of water required for the reaction in the late stage of cement hydration

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