THE EFFECT OF AUTOCLAVE TEMPERATURE ON THE EXPANSION AND HYDROTHERMALPRODUCTS OF HIGH-MGO BLENDED CEMENTS

The relations between the expansion and autoclave products for high Mg O blended cements are presented. The results show that restraining act ions of silica materials on MgO expansion are increased with the order as follows, slag < fly ash < quartz. The autoclave expansion at 10 MP a 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 a n important action in the stabilization of high-MgO blended cements by silica materials (C) 1998 Elsevier Science Ltd.