Pore structure related triaxial mechanical response and strength criterion of basalt fibre-reinforced coral aggregate concrete

Abstract

The triaxial mechanical behaviour of basalt fibre-reinforced coral aggregate concrete (BFCAC) was investigated in this study. The results show that an increase in the confining pressure and basalt fibre (BF) content causes an increase in the ductile deformation of BFCAC. The BF and confining pressure can increase the contraction volume deformation of BFCAC and reduce its expansion volume deformation. The confining pressure effect of the peak deviatoric stress and elastic modulus of BFCAC increases with BF content. The Poisson ratio of BFCAC increases as the BF content increases and decreases as the confining pressure increases. In addition, confining pressure causes BFCAC to transform from splitting failure to shear failure and extrusion plastic flow failure. When BFCAC is damaged, all the cracks penetrate through the coral aggregate. The relationship between the pore structure fractal dimension and the triaxial mechanical properties shows that the triaxial mechanical properties of BFCAC are affected by the BF as well as the BF’s effect on the pore structure. Finally, an improved nonlinear M-C strength criterion for BFCAC is established.

Keywords

basalt fibre / coral aggregate concrete / confining pressure effect / pore structure fractal dimension / improved M-C strength criterion

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