Abstract

Pastes of tricalcium silicate (C 3S) and β-dicalcium silicate (C 2S) 23 years old were studied by electron probe microanalysis. In both cases, regions consisting entirely or largely of calcium hydroxide and of CSH were distinguished on a scale of 2–50 μm. The regions high in CSH accounted for 75–80 percent of the whole in the C 3S paste and about 96 percent in the C 2S paste; these values are much higher than those initially occupied by anhydrous starting materials. Within the high CSH areas, no compositional variation was detected that could have corresponded to the so-called inner and outer hydrates. The ratio of mean Ca to mean Si in the high CSH areas was found to be 1.72 for the C 3S paste and 1.78 for the C 2S paste with an exciting beam energy of 10 keV.

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