Deformation Performance of Steel Tube Self-Compacting Lightweight Aggregate Concrete

Abstract

Abstract: Using shale ceramsite with bulk density of 500 kg/m³ and 800 kg/m³ and gravel with bulk density of 1 600 kg/m³ as coarse aggregates to prepare self-compacting lightweight aggregate concrete and ordinary concrete, forming steel tube lightweight aggregate concreteand ordinary concrete-filled steel tube. Compared with ordinary concrete-filled steel tube, the shrinkage strain, axial compression stress-strain change rule and temperature-strain change rule of the two are contrasted. The results show that as the bulk density of coarse aggregate decreases, the density, strength and elastic modulus of the same proportion of lightweight aggregate concrete gradually decrease. At the same age, the shrinkage strain of steel tube lightweight aggregate concrete is smaller than that of steel tube ordinary concrete, and the shrinkage strain of core lightweight aggregate concrete is also smaller than that of core ordinary concrete, better adhesion between steel tube and core lightweight aggregate concrete. The axial compression stress-strain change law of lightweight aggregate concrete-filled steel tube is basically the same as that of ordinary concrete-filled steel tube. Compared with ordinary steel tube concrete, the elastic modulus of steel tube lightweight aggregate concrete is reduced, but it is smaller than the reduction amplitude of lightweight aggregate concrete under non-steel tube confinement state. The temperature-strain of lightweight aggregate steel tube concrete and ordinary steel tube concrete are equivalent, both are about 4.0 με/℃.

Key words: concrete-filled steel tube, lightweight aggregate concrete, self-compacting, shrinkage strain, thermal expansion coefficient

CLC Number:

TU528.2

LI Shuming, ZHENG Xinguo, LIU Jing, XIE Yongjiang, HU Jialin, ZHANG Xu. Deformation Performance of Steel Tube Self-Compacting Lightweight Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1497-1502.

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