PREPARATION and MECHANICAL-ELECTRICAL PERFORMANCE of CARBON FIBRE SENSING CONCRETE

Abstract

Carbon fibre smart concrete is not only a promising type of structural materials, but also has prospective applications in fields that have special functional requirements. Here, the carbon fibre smart concrete was prepared by the extrusion moulding technique, and the resistivity, pressure-sensitive and temperature-sensitive characteristics were discussed as well as the freezing-Thawing properties. The results show that the total porosity of the smart concrete decreases when the carbon fibre was added into a cement matrix, which is 15.72 % in the case when carbon fibre content is 1.0 wt. %. The resistivity of the smart concrete decreases quickly with the addition of carbon fibre, which gradually decreases with an increasing temperature and then gradually increases, and the critical transition temperature zone is in the range of 100-130 °C. The compressive and flexural strengths of the smart concrete are the highest when the carbon fibre content is 0.6 wt. %. The rate of change of the resistivity shows an obvious linear response under cyclic loading effects. The freeze-Thaw resistance ability of the smart concrete with the addition of carbon fibres is better than that without carbon fibres, and the compressive strength reaches the highest level when the carbon fibre mass fraction is 0.6 wt. %, which indicates that a suitable amount of carbon fibres can effectively restrict the damage to smart concrete induced by temperature stress.