PROPERTIES AT EARLY AGES AND STRENGTH DEVELOPMENT OF HOT CONCRETE FOR COLD WEATHER CONCRETING

The aim of this study is to investigate the applicability of hot concrete to cold weather concreting. We carried out some experiments about the mix design, the properties at early ages, i.e. slump-loss and setting time, and the strength development of hot concrete for applying cold weather concreting. The use of superplasticizer is necessary to reduce the unit water content of hot concrete. The strength development of the hot concrete using superplasticizer is much the same as that of ordinary concrete. It was clarified that the slump retention type or the retardation type superplasticizer are effective to decrease the slump-loss of hot concrete and the average temperature of concrete for 60 minutes after mixing must be made less than 30℃.