Abstract
A comprehensive examination of the early hydration and microstructural development in tricalcium silicate pastes has been undertaken using scanning electron microscopy. Pastes have been studied for up to 28 days using both fracture surfaces and randomly sawn surfaces that have been polished and etched. Two distinct morphologies of calcium silicate hydrates have been observed: an acicular hydration product and an inner product which is not resolved by the scanning electron microscope. The relationships in the microstructure between the various hydration products and their influence on strength development is discussed.
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