Abstract
The authors are challenging to place much concrete in a shorter term by adopting rational construction methods (RCD/ELCM), for the first case in hot-weather areas in the world. However, fresh concrete under the hot-weather are easy to lose its workability, so main subject of this study is to improve this characteristics by adding flyash or retarder. After many concretes experiments, it is concluded from the test that flyash addition in high ratio was quite effective to keep the workability, at the same time, it is sure that 91 days concrete strengths were enough over the design standards of T dam. Further, the authors confirmed this results through the field concrete works in H dam site; using highly replaced flyash concretes in hot weather.
