Abstract

The distribution and composition of the products of hydrating alite have been studied using a backscattered electron detector in a scanning electron microscope. Polished surfaces of specimens were examined and analysed quantitatively. Calcium hydroxide forms in the available water filled space. Calcium silicate hydrate appears to have several distinct morphologies, and their fomation can be associated with the different stages of the reaction. These observations are compared with classification schemes derived from fracture surfaces which heretofore have been the usual kind of specimen examined.

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