Journal
COMPOSITE STRUCTURES
Volume 153, Issue -, Pages 30-41Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2016.06.008
Keywords
Fibre reinforced concrete; Flexural behaviour; Silica fume; Metakaolin; Polyvinyl alcohol (PVA); Basalt
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This paper presents the flexural test results of 21 fibre reinforced concrete (FRC) beams containing PVA and basalt fibres (1-3% by volume). Fibre reinforced concrete was made of three different binders; the first binder type was 100% cement, the other two types were blended cement system containing a part of 10% silica fume or metakaolin with 90% cement. For each the three binder system; 7 beams of the size 100 x 200 x 1500 mm were cast, the first beam known as control beam contained no fibres. The remaining 6 beams were cast using FRC containing a volume fraction of 1%, 2% and 3% PVA and basalt fibres, respectively. All 21 beams were tested to failure under three-point flexural loading. Experimental results showed that the addition of PVA fibres significantly improved the post-cracking flexural response compared to that of the basalt fibres. Beams with 3% PVA fibre volume showed deflection-hardening behaviour with an improvement in post-cracking flexural strength. It means that the addition of high volume content of PVA fibres made the beams more tough and ductile. Whereas, deflection-softening behaviour was observed in case of beams containing higher volume of basalt fibres. (C) 2016 Elsevier Ltd. All rights reserved.
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