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IJEMS Vol.14(5) [October 2007] >


Title: Fatigue of high-strength fibre-reinforced concrete
Authors: Badr, Atef
Issue Date: Oct-2007
Publisher: CSIR
Abstract: This paper reports the results of an experimental research that has been conducted to investigate the fatigue behaviour of high-strength fibre-reinforced concrete (HS-FRC), produced using silica fume (SF) and reinforced with steel fibre. Silica fume is an essential ingredient for the production of high strength concrete (HSC). It modifies the microstructure of the cement paste and produces high-strength concrete with desirable performance characteristics. However, modifying the microstructure of the cement paste could impair the ability of concrete to resist dynamic loading, a property that can be restored using steel fibre reinforcement. Five different mixes were investigated. The control mix was produced without fibre or silica fume. The other four mixes were reinforced with 1% (by volume) steel fibre. The effect of silica fume was investigated using three different replacement percentages at 5, 10 and 15 % by weight. The results suggested that the effect of steel fibre on the flexural fatigue strength was more significant than the effect of silica fume. The fatigue strength of mixes containing silica fume was slightly higher than that of the Portland cement HS-FRC. The reduction in flexural fatigue strength, due to increasing the number of loading cycles from 100,000 to 1,000,000, was negligible compared to the damage produced by the first 100,000 cycles. This outcome could have important technical and economical implications, as it would be sufficient to perform fatigue tests up to 100,000 cycles to rank several concrete mixes.
Page(s): 352-357
ISSN: 0971-4588
Source:IJEMS Vol.14(5) [October 2007]

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