铝酸钙水泥水化产物转化过程及调控研究进展

Research Progress on Conversion Process and Regulation of Hydrates of Calcium Aluminate Cement

铝酸钙水泥是一种性能优异的水硬性结合剂,但其水化产物中的亚稳相不可避免地发生转化,导致材料的体积收缩、孔隙率增大,引起强度下降、耐久性变差等问题,制约了铝酸钙水泥在重要领域中的应用。基于铝酸钙水泥的水化过程,描述了水化产物的形成和转化与温度的密切关系,介绍了铝酸钙水泥水化产物转化机理。并从外掺微纳米粉及化学添加剂、改变养护条件等方面阐述了调控铝酸钙水泥水化产物物相转化过程的研究进展。基于此,提出了铝酸钙水泥水化产物转化过程中尚待深入研究的问题。

Calcium aluminate cement is one of hydraulic binders with the superior performance.The metastable hydrates of calcium aluminate cement are inevitable to transform into stable ones under the action of time and temperature.The volume shrinkage occurs in the process of transformation,leading to the increase of porosity and the decrease of strength and durability of the material that can restrict the application of calcium aluminate cement.As is known,the formation and conversion of hydrates are closely related to temperature.This review introduced the conversion mechanism of hydrates of calcium aluminate cement,and represented the research progress on regulating phase composition of calcium aluminate cement hydration products via mixing micron-sized powder or nano-sized particles,adding chemical additives and adjusting curing conditions.In addition,some issues regarding the further studies were also put forward.