Abstract
Systematic sequential observations with the electron microscope were made of the morphological changes which occurred during hydration of C 3S ∗ and C 2S pastes, with and without the presence of gypsum. The specific effects of each of two admixtures were studied: triethanolamine and calcium lignosulphonate. Water to C 3S or C 2S ratio was 0.5 and admixture dosage was 0.5%. The admixtures had some effect on changes in microstructure, but they had a pronounced influence on the rate of the hydration processes.
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