Verification method for durability of reinforced concrete structures subjected to salt attack under high temperature conditions

Immersion tests of concrete specimens, corrosion tests of reinforced concrete specimens and combination tests of carbonation and chloride ion penetration of concrete specimens were conducted under high temperature. Verification method of durability against salt attack to reinforced concrete structures under high temperature was discussed. The obtained results were summarized as follows. (a) Diffusion coefficient of chloride ion in concrete increased as temperature rose. The relationship between the logarithm of diffusion coefficient and the reciprocal of temperature showed linearity. (b) The chloride ion concentration of reinforcing steel corrosion initiation did not decrease at high temperature. (c) Diffusion coefficient of chloride ion might be larger in carbonated concrete. (d) Based on the test results, a verification method of durability against salt attack on reinforced concrete structures under high temperature up to 65 °C, for avoiding steel corrosion, was proposed.