Abstract
The microstructure and fracture surfaces of glass fibre-reinforced cement (grc) composites have been examined by scanning electron microscopy. The toughness of grc stored in dry environments is attributed to the formation of a complex structure of subsidiary cracks, resulting in a large failure surface area, and the pull-out of the glass fibres. The reduction of the toughness of grc stored in wet conditions over a period of time reflects the reduction in the amount of subsidiary cracking and fibre pull-out. Observations indicate that this is due to changes in the microstructure of the matrix in and around the fibre bundles.
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