Abstract
To effectively characterise the dynamic mechanical properties of basalt fibre-reinforced coral aggregate concrete (BFRCAC) under confining pressure, a dynamic constitutive model of BFRCAC is presented through characterising the basalt fibre reinforcement by measuring the variation in elastic modulus and the mechanical damage by measuring the fracture probability of micro-crack propagation. The dynamic mechanical properties of BFRCAC under different confining pressures were investigated using a split Hopkinson pressure bar device with active confining pressure. A comparison of the theoretical results and experimental results indicates the good validity of the dynamic constitutive model. Analysis of damage development reveals that both strain rate and confining pressure have delayed effects on damage development. The addition of basalt fibre at an appropriate content reinforces the BFRCAC; consequently, the total damage is less than the mechanical damage in the early stage of deformation. As the deformation progresses, basalt fibre is gradually destroyed and its reinforcement effect gradually disappears, causing the total damage to gradually approach the mechanical damage. The bridging effect of basalt fibre helps restrain crack propagation; this not only slows the rate of damage in BFRCAC but also improves the confining pressure effect and strain rate effect of damage development.
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