Flexural responses of hybrid steel-polyethylene fiber reinforced cement composites containing high volume fly ash

被引:148
作者
Ahmed, Shaikh Faiz Uddin [1 ]
Maalej, Mohamed
Paramasivam, P.
机构
[1] Tohoku Univ, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan
[2] Natl Univ Singapore, Dept Civil Engn, Singapore 117576, Singapore
关键词
hybrid fiber; strain hardening; multiple cracking; toughness; fly ash;
D O I
10.1016/j.conbuildmat.2006.01.002
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Strain hardening and multiple cracking behavior of hybrid fiber reinforced cement composites containing different hybrid combinations of steel and polyethylene (PE) fibers under four-point bending are reported. The total volume fraction of fibers was kept constant at 2.5% to maintain a workable mix. Effects of increase in fly ash content as partial replacement of cement beyond 50%, such as 60% and 70% on the flexural response of hybrid steel-PVA (polyvinyl alcohol) and steel-PE fiber composites are also evaluated here. Among composites with different volume ratios of steel and PE fibers, the composite with 1.0% steel and 1.5% PE was found to show the highest flexural strength and that with 0.5% steel and 2.0% PE exhibited highest deflection and highest flexural toughness. Generally, the steel-PE hybrid composites exhibited lower flexural strength but higher deflection capacity than steel-PVA hybrid composites. The rate of strength loss after peak load in steel-PE hybrid composites was found low compared to steel-PVA hybrid system. The 50% replacement of cement by fly ash is found to be an optimum fly ash content in hybrid fiber composites. (c) 2006 Elsevier Ltd. All rights reserved.
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页码:1088 / 1097
页数:10
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