The effect of hydrophilic (polyvinyl alcohol) fiber content on the flexural behavior of engineered cementitious composites (ECC)
The effect of hydrophilic (polyvinyl alcohol) fiber content on the flexural behavior of engineered cementitious composites (ECC)
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DOI：
10.1080/00405000.2017.1329132
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
H. R. Pakravan;M. Jamshidi;M. Latifi
中科院分区：
文献类型：
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作者：
H. R. Pakravan;M. Jamshidi;M. Latifi
本文研究了亲水性聚乙烯醇（PVA）纤维掺量（1.2-2.0%）对工程水泥基复合材料（ECC）弯曲性能的影响。不同的弯曲性能参数，如强度在第一次开裂和开裂后阶段，在极限载荷下的挠度，韧性指数根据ASTM 1018，弯曲模量，和能量吸收进行了测定。试验结果表明，随着纤维含量的增加，复合材料的弯曲强度和弯曲模量显著提高。然而，复合材料的弯曲强度变化从8.5到14 MPa取决于PVA纤维的量。纤维含量从1.6%增加到2%，韧性指数、最大载荷下的挠度和能量吸收均降低。结果表明，在纤维含量较高时，复合材料的弯曲强度与塑性之间存在间接关系。
Abstract This paper investigates the effect of hydrophilic polyvinyl alcohol (PVA) fiber’s content (1.2–2.0% volume of composite) on the flexural behavior of engineered cementitious composites (ECC) materials. Different parameters of flexural behavior such as strength at first-cracking and post-cracking stages, deflection at ultimate load, toughness indices according to ASTM 1018, flexural modulus, and energy absorption were determined. Test results showed that the flexural strength and flexural modulus of composites significantly increases by increment in fiber content. However, flexural strength of composites varies from 8.5 to 14 MPa depending on amount of PVA fibers. The toughness indices, deflection at max load and energy absorption were decreased by further increase in the fiber content from 1.6 to 2%. It was indicated that there was an indirect relationship between flexural strength and ductility of composite in higher amount of fiber content.