Flexural toughness characteristics of steel-polypropylene hybrid fibre-reinforced oil palm shell concrete
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- 作者：Soon Poh Yap ; Chun Hooi Bu ; U. Johnson Alengaram ; ujohnrose@yahoo.com" class="auth_mail ; Kim Hung Mo ; Mohd Zamin Jumaat
- 关键词：Hybrid fibre ; Steel fibre ; Polypropylene fibre ; Oil palm shell ; Fibre-reinforced concrete ; Lightweight concrete
- 刊名：Materials and Design
- 出版年：May, 2014
- 年：2014
- 卷：57
- 期：Complete
- 页码：652-659
- 全文大小：931 K
文摘
Hybridization of steel-polypropylene leads to improvements of both the mechanical and ductility characteristics of concrete. In this investigation, the effect of steel, polypropylene (PP) and steel-PP hybrid fibres on the compressive strength, tensile strength, flexural toughness and ductility of oil palm shell fibre reinforced concrete (OPSFRC) was studied. The comparison on the above said properties between the specimens prepared with crushed and uncrushed oil palm shell (OPS) as lightweight coarse aggregate was also carried out. The experimental results showed that the highest compressive strength of about 50 MPa was produced by the mix with 0.9% steel and 0.1% PP hybrid fibres. The highest increments in the splitting tensile and the flexural strengths of the OPSFRC were found up to 83% and 34%, respectively. However, the mixes with 1% PP fibres produced negative effects on both the compressive and tensile strengths. The results on the toughness indices showed that the OPSC possess no post-cracking flexural toughness. Though, the flexural deflection and toughness of the OPSC was significantly enhanced by the addition of fibres; the dominance of the steel fibre on the first crack flexural deflection and toughness of OPSFRC was evident. The mixes with 0.9% steel and 0.1% PP hybrid fibres reported the highest improvement in toughness index and residual strength factor.