Research on hydration heat temperature field in mass concrete side wall of large water pump station

Based on the monitored data during construction of a thick concrete side wall of a deep foundation in Shanghai Qingcaosha Raw Water Engineering, the development of hydration heat temperature field and its detailed distribution were studied. The biggest temperature difference between inside and outside of the structure occurred about 3 days after the concrete was cast, when hydration heat in the core completely released and core temperature began to fall. This temperature difference then narrowed till the end of concrete curing. After 3 days, the non-uniform temperature distribution and general descending of temperature usually cause surface and through cracks. It´s proved by the monitored data that concrete curing with surface maintenance is effective in reducing the influence of environment temperature field on that of the concrete, thus beneficial to the control of temperature crack. At last, some suggestions were put forward for the control of temperature stress in mass concrete.