Abstract
Mixtures of different MgO/CaO and CaO/SiO 2 were treated hydrothermally at 180 to 300 °C saturated water vapor pressures for 10h-3days. The results show that tobermorite coexists with Mg(OH) 2 and xonotlite phases at 180 °C, that xonotlite phase is coexistent with hydrous magnesium silicate when Mg(OH) 2 disappears at over 240 °C. MgO can enter 14.71wt.% into xonotlite phase, more than in tobermorite phase. At the same time, the variation of lattice parameters in Mg-xonotlite phase is extremely small.
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