Abstract
The topography of fracture surfaces of some pastes of tricalcium silicate solid solutions hydrated for 3 years was studied by scanning electron microscopy. The symmetrical areas of the two halves arising from a single fracture operation were compared. Observations have been also made on the surfaces, one of which was partially attacked. Large amorphous C-S-H zones are abundant; acicular and subgrain forms in irregular pores are also present. Ca(OH) 2 masses both in large and very little areas for the typically lamellar morphology are recognizable. No visible porosity at the boundaries between C-S-H and Ca(OH) 2 solid phases in descernible. The fracture paths are transparticle in character. The results of the selective dissolution of the fracture surface of one half in respect to the other unattached are discussed.
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