The heat of hydration of cement causes the internal temperature rise at early age, particularly massive concrete structures such as a footing of nuclear reactor building, a dam, and substructure of long span bridge. As the results of the temperature rise and restraint condition, the thermal stress may induce cracks in concrete. Therefore, the prediction of the thermal stress is very important in the design and construction stages in order to control the cracks developed in mass concrete. And, in case of young concrete, creep effect by the temperature load is larger than that of old concrete. Thus, the effect of creep must be considered for checking the cracks, serviceability, durability and leakage.
This study is consisted of two parts. The first, it is to develop a finite element program which is capable of simulating the temperature history in mass concrete. The second, the thermal stress considering creep is calculated by using the modified elastic modulus due to inner temperature change and maturity.
It is shown that the analytical results of this study is in good aggrement with experimental data in the literatures, and JCI's analytical results. But the temperature history in the outer parts contact with ambient environment do not fit well with experimental data due to the change of atmospheric temperature and heat transfer coefficient by wind velocity.
The results in the inner parts highest important to control cracks is in good aggrement with experimental data. Therefore this study may provide available method for control the cracks.