Crack resistance of carbon fibres reinforced composites after high temperature loading

Abstract eng:
Presented paper deals with fracture behaviour of carbon fibre reinforced composites on the basis of Portland (PC) and alumina (HC) cement. Carbon fibres can be used for these composites to improve their high temperature resistance and mechanical/fracture properties. For quantification of the resistance against a crack propagation the laboratory specimens 40x40x160 mm were heated with temperatures up to 200, 400, 600, 800 and 1000°C with holding time 1 hr; a set of comparative specimens was made as well. After cooling to the laboratory temperature, the specimens were notched with a diamond saw and subjected to the three point bending test with a notch in a tensile zone. Determined mechanical/fracture parameters served for comparison of suitability of PC and HC composites utilization as protective fire resistant slab structures.

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