Publication details

The influence of blast- furnace slag hydration products on micro cracking of concrete

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GREGEROVÁ Miroslava BOHÁČ Martin

Year of publication 2007
Type Article in Proceedings
Conference 11th Euroseminar on Microscopy Applied to Building Materials
MU Faculty or unit

Faculty of Science

Field Geology and mineralogy
Keywords blast- furnace slag - hydration products - micro cracking - concrete - EMPA
Description New hydration products of ground granulated blast-furnace slag are formed during the hydration process of Portland slag cement concrete. Spatial distribution of microcracks in concrete is related also to newly formed slag hydrates. The chemical composition of hydration products is very variable and unstable. The Si/Ca ratios rise in hydration products near the unhydrated slag core significantly. There is also a certain increase of Mg and Al content in the central parts of hydration rims. The amount of microcracks was reduced in concretes with a lower content of vitreous fraction where the slag basicity was high. Neoformation of hydration products is accompanied by volume changes which can lead to concrete microcracking.
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