混凝土水化放热模型的实验分析和计算

大体积混凝土因早期水化热引起的温度场 会导致开裂, 影响结构安全和正常使用, 其中混凝土热学参数的准确性会直接影响混凝土温度场计算的准确性. 从胶凝材料水化反应机理出发, 基于化学反应动力学原理及不同矿物组成的水泥水化热实验数据, 提出了一种考虑粉煤灰掺入和温度影响的混凝土水化放热模型. 该模型可以准确地反映混凝土水化放热量及温升随龄期的变化, 且与实测值吻合良好.

xperimental analysis and calculation of a hydration heat model for concrete

Owing to the temperature field generated by early-hydration heat, mass concrete causes temperature stress cracking, affecting structural safety and normal use. The accuracy of the thermal parameters of concrete affects the accuracy of the concrete temperature-field calculations. Based on the hydration reaction of cementitious materials in concrete, theory of chemical reaction kinetics, and experimental data for cement hydration heat from different fly ash additives, a formulation of the hydration heat model for concrete was developed, considering the effects of fly ash and temperature. The model could accurately predict the heat release and temperature rise of the concrete hydration reaction with age, and the prediction results were in good agreement with the experimental data.