混凝土绝热温升的实验测试与分析

从理论上讨论了影响混凝土绝热温升的主要因素，并通过实验分析了初始入模温度、掺加粉煤灰和减水剂等因素对混凝土绝热温升和温升速率的影响．结果表明，提高混凝土初始入模温度将加速胶凝材料的水化，并缩短水化反应持续时间，这对低强度等级混凝土所用胶凝材料的水化程度影响不大，所以对其绝热温升值影响不显著，但明显降低高强度等级混凝土所用胶凝材料的水化程度，使其绝热温升值下降．掺加粉煤灰或减水剂来改变混凝土的工作性也会影响混凝土的绝热温升值和温升速率．

Experiment and Analysis of Concrete Adiabatic Temperature Rise

Main factors influencing concrete adiabatic temperature rise are discussed theoretically. The influences of initial casting temperature, superplasticizer and fly ash on the adiabatic temperature rise and the temperature rise rate of concrete were studied. Elevating the initial casting temperature of concrete accelerates the hydration of binder and shortens the continuance of hydration, but shows little effect on the hydration degree of binder used in the concretes with low strength grade, therefore no effect on their adiabatic temperature rise. The hydration degree of binder used in the concretes with high strength grade, as well as their adiabatic temperature rise decrease significantly due to elevation of their initial casting temperature. Addition of fly ash or modification of concrete workability with superplasticizer affects the adiabatic temperature rise and the temperature rising rate of concrete.