Influence of temperature rising inhibitor on nucleation and growth process during cement hydration
Influence of temperature rising inhibitor on nucleation and growth process during cement hydration
复制标题
升温抑制剂对水泥水化成核及长大过程的影响
DOI：
10.1016/j.tca.2019.178403
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发表时间：
2019-11-01
影响因子：
3.5
通讯作者：
Wang, Wenbing
中科院分区：
文献类型：
--
作者：
Zhang, Hao;Liu, Xin;Wang, Wenbing
大体积混凝土中通常使用温升抑制剂，以降低早期水化过程中的热裂风险。通过等温量热分析和边界成核-生长理论研究了TRI对水泥水化过程中成核和生长动力学的影响。实验和模拟结果表明，TRI优先降低生长速率，对成核过程影响很小。作为对照组，合成的C-S-H颗粒更倾向于促进C-S-H生长过程而不是提供成核面积，而方解石对成核密度和生长速率影响很小。此外，位点饱和发生时间t o 与峰值时间倒数表现出良好的线性相关性，表明热峰可能是由边界位点饱和引起的。成核和生长的特征参数可以用来调控水泥水化过程，这在TRI的实际应用中非常有意义。
Temperature rising inhibitor is usually used in mass concrete to reduce the thermal cracking risk during the early hydration. The influence of TRI on nucleation and growth kinetics during cement hydration has been investigated by isothermal calorimetry analysis and boundary nucleation-growth theory. Experimental and simulated results showed that TRI decreased the growth rate preferentially and have little influence on the nucleation process. As comparison groups, synthesized C-S-H particles are more inclined to promote C-S-H growth process rather than provide nucleation area while calcite has little influence on nucleation density and growth rate. Additionally, the site saturation occurrence time t o and inverse of time to peak show good linear correlation, suggesting that heat peak is likely caused by the site saturation of boundaries. The characteristic parameters of nucleation and growth can be used to regulate the cement hydration process which is very meaningful in practical application of TRI.