Abstract
The microstructure in terms of morphological aspects and semi-quantitative elemental composition analysis of matching halves of a crack in a commercial Portland cement mature paste has been examined. Scanning electron microscope (SEM) and energy-dispersive X-ray analysis (EDXRA) results obtained for the “twin” regions of the two surfaces have given a more correct interpretation of the spatial texture both of the bulk massive paste and the typical localized regions. Hydrated phases “fingerprints” available from morphologies along with Ca/A1, Ca/Si, Ca/S and Ca/Fe count ratios are offered. A rather unusual feature of a relatively massive lamellar Ca(OH) 2 has been noted.
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