초록
When urea is mixed with concrete, the temperature of the concrete is reduced by endothermic reaction between water and urea. By using this property, it is possible to reduce the temperature of concrete at both casting stage and during the hydration process. This can be very advantageous in mass concrete constructions and when concrete is being cast under high ambient temperature like in the summer or in hot. In this study the influence of urea in concrete on flowability, heat of hydration, setting time, strength and drying shrinkage strain are discussed. The result of the experiment show that apart from the fact that urea can reduce the hydration temperature in concrete, it can also enhance both flowability and durability of concrete.
