The effect of autoclave temperature on the expansion and hydrothermal products of high-MgO blended cements

The relations between the expansion and autoclave products for high MgO blended cements are presented. The results show that restraining actions of silica materials on MgO expansion are increased with the order as follows, slag < fly ash < quartz. The autoclave expansion at 10 MPa is less than at 2 MPa when additions of Ay ash or quartz are beyond a suitable amount. It is also established that not only the formation and quantities of tobermorite phase but that of xonotlite phase play an important action in the stabilization of high-MgO blended cements by silica materials (C) 1998 Elsevier Science Ltd.