水化热抑制剂对复合胶凝材料体系早期水化动力学的影响

Effect of Temperature Rising Inhibitor on Early Hydration Kinetics of Composite Cementitious Material

本文研究了水化热抑制剂(TRI)对水泥-粉煤灰-矿渣复合胶凝材料早期水化过程。通过改变矿物掺合料在胶凝材料中的质量占比以及TRI的掺量,研究了胶凝材料的水化特性,并基于Krstulovic-Dabic水化动力学模型计算了反应速率常数、几何晶体生长指数等动力学参数。结果表明,矿物掺合料和TRI复合使用会延缓胶凝材料水化并降低最大放热速率;复合胶凝材料的水化过程均有结晶成核与晶体生长、相边界反应以及扩散3个阶段,Krstulovic-Dabic水化动力学模型能较好地模拟各复合胶凝材料的水化过程;矿物掺合料和TRI会影响复合胶凝材料水化产物的结晶成核以及晶体生长,并降低复合胶凝材料各阶段的水化速率。

The effect of temperature rising inhibitor(TRI)on early hydration process of cement-fly ash-slag composite cementitious material was studied.By changing mass proportion of mineral additives in gel materials and amount of TRI,the hydration characteristics of cementitious materials were measured.The reaction rate constant,geometric crystal growth index and other dynamic parameters were calculated based on the Krstulovic-Dabic model.The results show that mineral additives and TRI delay the time of hydration and reduce the maximum hydration rate of cementitious materials.The hydration process of composite cementitious material can involve three stages,i.e.nucleation and crystal growth,interactions at phase boundaries and diffusion.The hydration process can be predicted by Krstulovic-Dabic model well.Mineral additives and TRI affect the crystallization of nucleation and crystal growth,and reduce the hydration rate of composite cementitious material at every stage.