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首页> 外文期刊>Materials & design >Flexural toughness characteristics of steel-polypropylene hybrid fibre-reinforced oil palm shell concrete
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Flexural toughness characteristics of steel-polypropylene hybrid fibre-reinforced oil palm shell concrete

机译：钢-聚丙烯混杂纤维增强油棕壳混凝土的抗弯韧性特征

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摘要

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.
机译：钢-聚丙烯的杂化可以改善混凝土的机械性能和延展性。在这项研究中，研究了钢，聚丙烯（PP）和钢-PP杂化纤维对油棕壳纤维增强混凝土（OPSFRC）的抗压强度，抗张强度，弯曲韧性和延展性的影响。在使用压碎和未压碎的油棕壳（OPS）作为轻质粗骨料制备的样品之间，还进行了上述性能的比较。实验结果表明，通过与0.9％的钢和0.1％的PP杂化纤维混合可产生最高约50 MPa的抗压强度。发现OPSFRC的劈裂拉伸强度和弯曲强度的最高增量分别达到了83％和34％。但是，含有1％PP纤维的混合物对压缩强度和拉伸强度均产生负面影响。韧性指数的结果表明，OPSC没有开裂后的弯曲韧性。但是，OPSC的弯曲挠度和韧性由于添加了纤维而大大增强了。钢纤维对OPSFRC的初次裂纹挠曲挠度和韧性具有明显优势。与0.9％的钢和0.1％的PP杂化纤维形成的混合物在韧性指数和残余强度因子方面的改进最大。

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