2025 Volume 81 Issue 6 Article ID: 23-00201
Concrete work often encounters challenges such as cold joints and poor filling in hot weather conditions. These issues primarily arise due to the increased loss of fluidity and shortened setting time caused by elevated concrete temperatures. In light of these concerns, this study proposes a new chemical admixture incorporating fluidity retainers and setting retarders to address the abovementioned issues associated with hot weather concreting. This study shows three significant contributions: 1) the admixture formulation consisting of poly-carboxylic acid, oxy-carboxylic acid, and sugar effectively mitigates slump loss and prolongs setting time in high temperatures; 2) concrete incorporating the proposed admixture significantly enhances workability retention and extends setting time, enabling a comparable performance level at 20°C to be achieved even at temperatures exceeding 35°C; 3) the admixture does not adversely affect concrete strength and durability. Subsequently, in a practical implementation of the admixture on an actual construction project under hot weather conditions, it was observed that concrete incorporating the admixture exhibited performance levels equivalent to these achieved at 20°C.
