A new classification system for fire-damaged concrete based on the strain energy dissipated in a hysteresis loop

摘要

This paper reports on experimental research into further developing the stiffness damage test (SDT) as a quantitative tool to be used in assessing fire-damaged concrete. The research programme reported here aimed at establishing the correlation between the strain energy dissipated in a hysteresis loop, performed on fire-damaged concrete core, and the post-firing residual stiffness characteristics. The dependency of such correlation on the level and mechanism of damage was investigated by involving five test variables, namely: maximum temperature of exposure, method of cooling, duration of thermal exposure, grade of concrete and type of aggregate used.