Abstract: Temperature responses of concrete in service environment affect the hydration process, water/ions transportation and rebar corrosion in concrete.The temperature and RH (relative humidity) evolution of saturated concrete and Non-saturated concrete with RH=45%, 65% and 80% rising and cooling process at 5 ℃, 45 ℃, 65 ℃ and 85 ℃ temperature were studied.And the thermal conductive coefficient of non-saturated concrete was also tested.The results of the experiment prove that temperature response time of concrete was increased with decreasing RH.Compared with response time of saturated concrete in rising and cooling process, the time of concrete with RH=45% prolonged 6-7 and 7-8 times, respectively.And the time of thermal flow to 10 mm depth of concrete with RH=45%-65% would be 30-50 min.The temperature response time of concrete would be shortened with decreasing distance to thermal source when concrete subjected to rinsing and cooling process.The inner RH of concrete increased firstly, and then trended toward steady in the temperature rising and cooling process.The interaction effects between thermal conduction and RH transportation was observed in this experiment.Additionally, the thermal conductive coefficient of concrete increased with increasing RH in concrete, and extending curing age.

Key words: non-saturated concrete;temperature;RH;thermal conduction