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On hot weather concreting, time-dependent change of fresh concrete temperature should be estimated to prevent troubles, such as slump down and/or cold joint, etc., caused by temperature rise. In this ...study, the coefficient α and β in the equation estimating fresh concrete temperature shown in JASS 5 were measured and discussed by the real size experiments. The coefficient β, that was the temperature rise due to the heats caused by the mixer, cement hydration and friction of materials while mixing, was smaller than the values in JASS 5, because mixing period was steadily shortened reflecting the advance of mixers. The coefficient α, that showed heat transfer among air and concrete, was not affected by slump values, ratio of concrete quantity against agitator capacity, etc. That was the different tendency against the small scale experiments.show more
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jaud016_p133