Flexural responses of hybrid steel-polyethylene fiber reinforced cement composites containing high volume fly ash
Flexural responses of hybrid steel-polyethylene fiber reinforced cement composites containing high volume fly ash
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DOI：
10.1016/j.conbuildmat.2006.01.002
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发表时间：
2007-05-01
影响因子：
7.4
通讯作者：
Paramasivam, P.
中科院分区：
文献类型：
--
作者：
Ahmed, Shaikh Faiz Uddin;Maalej, Mohamed;Paramasivam, P.
报道了含有不同钢和聚乙烯（PE）纤维混合组合的混合纤维增强水泥复合材料在四点弯曲下的应变硬化和多次开裂行为。纤维的总体积分数保持恒定在 2.5%，以保持可行的混合物。本文还评估了部分替代水泥超过 50%（例如 60% 和 70%）时粉煤灰含量增加对混合钢-PVA（聚乙烯醇）和钢-PE 纤维复合材料弯曲响应的影响。在钢和PE纤维不同体积比的复合材料中，1.0%钢和1.5%PE的复合材料表现出最高的弯曲强度，而0.5%钢和2.0%PE的复合材料表现出最高的挠度和最高的弯曲韧性。一般来说，钢-PE杂化复合材料比钢-PVA杂化复合材料表现出较低的弯曲强度但较高的挠曲能力。与钢-PVA 混合系统相比，钢-PE 混合复合材料在峰值负载后的强度损失率较低。研究发现，用粉煤灰替代 50% 的水泥是混合纤维复合材料中的最佳粉煤灰含量。 (c) 2006 Elsevier Ltd. 保留所有权利。
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.