Abstract
Cracking induced by a thermal stress must be taken into consideration when the mass concrete or high strength concrete with a higher cement content is placed'especially in winter time. The antifreezing agent, which is applied to the winter concreting, can control the freezing point of concrete and accelerate the hydration at a curing temperature even below normal freezing point whereas temperature rise due to hydration can not be restrained.
We have developed a new antifreezing agent with higher range water-educing capability than that available at present, and have examined the improvement of the temperature rise associated with the reduce of cement content. Experiments have been carried out for the water-educing capability, freezing temperature, setting time, heat of hydration and compressive strength of concrete using the high-range water-educing and antifreezing agent. The applicability of this new admixture to different types of cement was also studied.
