Investigation on shear performance and prediction model of CFRP-ECC-concrete composite interface suffered from anodic polarization and environmental degradation

This study aims to investigate shear performance and prediction model of CFRP-ECC-concrete composite interface suffered from anodic polarization and environmental degradation. The effect of ECC mixtures, cathodic current densities, polarization period, and the duration of sulfate soaking and sulfate attacking by wet and dry cycles on the interface of the composite were studied. The results showed that three failure modes of CFRP-ECC-concrete composite interface were found. Shear load-slip curves showed double broken lines characteristics, while voltage-deterioration time curves showed an approximate linear increase relationship between voltage and polarization time. The five parameters all had significant effects shear strength deterioration on the CFRP-ECC-concrete composite interface. Moreover, this study proposed an innovative prediction model to the interfacial shear strength by the measured voltage, which can provide an important basic theory for ICCP-SS technology. This work makes a contribution to the ICCP-SS technology on the shear performance and prediction model of composite interface.