Mechanical properties and constitutive model of carbon fiber reinforced coral concrete under uniaxial compression

Abstract

This study aims to investigate the axial stress–strain behavior of carbon fiber reinforced coral concrete (CFRCC). The investigated variables include concrete strength and CF dosage (0.0%, 0.3%, 0.6%, 1.0%, 1.5%, 2.0% by weight of the cement). Test results show that the failure process of CFRCC can be divided into four phases: linear elastic phase, cracks stable development phase, cracks unstable development phase, and descending phase. The peak strain, elastic modulus, ductility, and axial compression toughness ratio of coral concrete are lower than that of ordinary concrete and can be improved by adding CFs. The addition of CFs also increases the peak stress, residual stress, and ultimate strain of coral concrete. Based on the test results, an empirical piecewise constitutive model and a damage constitutive model are proposed for CFRCC. The proposed constitutive models can effectively predict the stress-strain behavior of both CFRCC and coral concrete without CFs.