【摘要】 为了解复合胶凝材料体系水化放热特性,以及化学驱动与热力学驱动对复合胶凝材料体系的水化放热影响,研究了不同掺量的粉煤灰/矿粉-水泥二元复合胶凝体系的水化热发展,同时探究了不同早强剂掺量以及不同温度对粉煤灰-水泥二元复合胶凝体系水化放热的影响。结果表明:粉煤灰、矿粉均会降低二元复合胶凝体系水化放热速率,但矿粉活性比粉煤灰高,对水化放热速率以及最终累计放热量影响较小;化学驱动可以显著提高体系水化放热速率,促进早期水化发展,但不改变最终累计放热量;热力学驱动作用效果更显著,可以大幅提高体系放热曲率以及累计放热量。以化学反应速率为判据构建两种驱动的联系能有效地设计混合驱动模式。更多还原

【Abstract】 In order to understand the hydration heat release characteristics of the composite cementitious material system, and the influence of chemical and thermodynamic driving on the hydration heat release of the composite cementitious material system, the development of hydration heat of the binary composite cementitious system of fly ash-or slag-cement with different content was studied. At the same time, the influence of different harden accelerator content and different temperatures on the hydration heat release of the fly ash-cement binary composite cementitious system was explored. The results show that both fly ash and slag can reduce the hydration heat release rate of the binary composite cementitious system, but the activity of slag is higher than that of fly ash, which has little effect on the hydration heat release rate and the final cumulative heat release. Chemical driving can significantly increase the rate of hydration heat release of the system and promote the development of early hydration, but it does not change the final cumulative heat release. The thermodynamic driving effect is more significant, which greatly increases the heat release curvature of the system and the cumulative heat release. Using the chemical reaction rate as the criterion to establish a connection between the two driving forces can effectively design the hybrid driving mode.更多还原