Effect of temperature on electrical resistivity of high-performance fiber-reinforced concretes

Abstract

The effect of temperature on the electrical resistivity of high -performance fiber-reinforced concretes (HPFRCs) were highlighted in this investigation through an experimental approach. There are four HPFRC mixtures as follows: HPFRC0 (no fiber), HPFRC1 (macro steel fiber, 1.5% by volume), HPFRC2 (micro steel fiber, 1.5% by volume), and HPFRC3 (hybrid fiber, 1.0% by volume macro steel fiber blended with 0.5% by volume micro steel fiber). All HPFRC specimens had an identical size of 40 × 40 × 160 mm3 (width x depth x length). The electrical resistivity of HPFRCs was measured under three temperature levels, including 0oC, 25oC, and 50oC using a chamber machine. The research proved that the electrical resistivity of the studied HPFRCs obviously decreased with increasing of the temperature ranging from 0oC to 50oC. Generally, the temperature exhibited a considerable effect on the electrical resistivities of cement-based composites.