Abstract
Crack growth behaviour of polypropylene, carbon-fibre and mica-flake reinforced cement composite systems subjected to a compressive load was investigated by an AC impedance technique. Two crack dependent processes appear to be associated with characteristics of the high-frequency arc diameter ratio, R 2/ R 20 versus load ratio, P/ P m curves for cement-based composites. These correspond to microcrack formation and propagation. Evidence indicates that slight increases of the high frequency arc (HFA) diameter in the fibre-reinforced systems as the load increases are a result of the fibre reinforcement impeding the crack formation process. It is suggested that microstructural densification in the vicinity of the fibre boundary influences the crack formation process and leads to a slight increase of the HFA diameter.
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