水泥初凝终凝的形成机理及其微观结构

Mechanism and microstructure of initial setting and final setting of cement

通过维卡针测试水泥的初凝和终凝时间,利用超声波反射系数法测试水泥早龄期的剪切模量的发展,应用水泥水化模拟软件CEMHYD3D仿真分析水泥水化的微观结构演化过程。将水泥净浆中水化产物生成的数量、固相物质的连通以及剪切模量等随水化发展的情况与初凝时间和凝结时间相联系,形成了微观结构层面水泥初凝和终凝的形成机理。

The initial setting time and final setting time of cement are tested by Vicat needle according to ASTM C191-2008,and the development of shear modulus of cement at early age is tested by ultrasonic wave reflection coefficient method.The microstructure evolution of cement hydration is analyzed by simulation software for cement hydration CEMHYD3D.The quantity of hydration products,the connection of solid materials and shear modulus with the development of hydration are related to the initial setting time and setting time,and the formation mechanism of initial setting and final setting of cement at microstructure level is formed.