Cement Chemistry
INVESTIGATION OF THE STRUCTURE OF Mg AND ALKALI-ADDED 1.4nm TOBERMORITE DRIED UNDER VARIOUS CONDITIONS
2019 Volume 73 Issue 1 Pages 10-17
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2019 Volume 73 Issue 1 Pages 10-17
In this paper, the effect of drying condition on the structural change of Mg and alkali added 1.4nm tobermorite was examined through measuring the samples which were dried at RH＝11-88％ for a long time, after hydration at 80℃. As a result, at RH＝11％, 1.4nm tobermorite was well-crystalized and its strcture was stabilized, which was unstable under high RH condition. Furthermore, the N2 sorption isotherm of the samples suggested that meso- and macropore structure of pretreated samples were completely different by conditions of long-term drying, even though XRD showed no significant differences. Besides, under 80℃ hydration, formation of 1.4nm tobermorite might be promoted by Mg, which is considered to be bridged the Si chain between the 1.4nm tobermorite layers.
