Cyclic Compression Performance and Constitutive Relationship of Carbon Fiber Recycled Aggregate Concrete

Abstract

Abstract: In order to study the compressive behavior of carbon fiber recycled aggregate concrete (CFRAC) under cyclic loading, 40 cylindrical specimens were designed and fabricated for cyclic loading test with recycled coarse aggregate replacement rate, carbon fiber volume content and loading rate as variation parameters. The test observed the failure mode of the specimen, obtained the stress-strain curve, and analyzed the influences of different variation parameters on the mechanical behaviors such as peak stress, peak strain, plastic strain, stiffness degradation and stress degradation. The results show that the carbon fiber recycled aggregate concrete specimens mainly undergo oblique splitting failure under cyclic loading. The incorporation of carbon fiber improves the cyclic compression performance of recycled aggregate concrete. Compared with unmixed carbon fiber concrete, when the volume content of carbon fiber is 0.3%, the peak stress and peak strain increase by 11.33% and 12.22%, respectively. The degree of stiffness degradation and stress degradation is reduced. When the replacement rate of recycled coarse aggregate is 100%, the peak stress and peak strain increase by 10.16% and 14.29%, respectively. Finally, the stress-strain constitutive equation of carbon fiber recycled aggregate concrete under cyclic compression is proposed.

Key words: carbon fiber, recycled aggregate concrete, cyclic compression test, stiffness degradation, stress-strain relationship

CLC Number:

TU528.572

WU Huiqin, LIU Xingchi, CHEN Yuliang. Cyclic Compression Performance and Constitutive Relationship of Carbon Fiber Recycled Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2743-2753.

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