2018 Volume 67 Issue 7 Pages 738-745
It has been reported that the mechanical properties of concrete would be severely damaged due to the thermal stress and the high vapor pressure when the concrete is subjected to a high temperature environment over 500 °C especially in the cases of the high strength concrete. However, in the cases of the normal strength concrete subjected to the heating up to 300 °C could be generally used after the fire damage, although the durability of such concrete members has not been clarified enough. In this study, the chloride-induced corrosion of steel in concrete subjected to the heating up to 300 °C was investigated. As a result, it was clarified that when the heating temperature exceeded 100 °C, the increase of the porosity of the heated concrete resulted in the decrease of the compressive strength and that the Cl- penetration into concrete accelerated by the heating over 150 °C resulted in the promotion of the chloride-induced steel corrosion in the heated concrete due to not only the increase of the porosity but also the decrease of the Cl- fixing ability of the concrete.
