Hydration Heat Analysis in Sequential Placement of Massive Concrete

The hydration heat of cement causes the internal temperature rise and the volume change in massive concrete structures at an early age. Due to the temperature rise under restraint boundary conditions in concrete structures, thermal cracks can be occured when thermal stress due to hydration heat in concrete exceeds its tensile strength. Crack decreases the durability of concrete. The objective of this research is to compute the history of temperature and thermal stress in sequential placement of massive concrete. HYCON.FOR has been developed based on the computer programs which have been developed in KAIST. The result by this program has been compared with those by ADINA-T and DIANA which are well-known compter programs for this field. Good agreement has been obtained with those by the commercial programs. Thus, it is concluded that the developed program is effective for the evaluation of hydration heat and thermal stress in sequential placement of massive concrete structures.