The effect of accelerated aging on the interface of jute textile reinforced concrete

材料科学 复合材料 硅酸盐水泥 偏高岭土 热重分析 加速老化 纤维 耐久性 扫描电子显微镜 固化(化学) 水泥 聚合物 复合数 降级(电信) 相对湿度 氢氧化钙 化学工程 工程类 物理 热力学 电信 计算机科学
作者
Maria Ernestina Alves Fidelis,Romildo Dias Tolêdo Filho,Flávio de Andrade Silva,Viktor Mechtcherine,Marko Butler,Simone Hempel
出处
期刊:Cement & Concrete Composites [Elsevier BV]
卷期号:74: 7-15 被引量:62
标识
DOI:10.1016/j.cemconcomp.2016.09.002
摘要

In this work the degradation mechanisms of concrete reinforced with natural jute textile are discussed. Double-sided pullout tests were performed on specimens reinforced with polymer-coated and uncoated jute fabrics. To obtain a composite with an enhanced durability performance a matrix with partial replacement of the Portland cement by metakaolin was used. Before testing, the specimens were subjected to accelerated aging conditions. After a curing period of 28 days in water the samples were exposed to a temperature of 40 °C and a relative humidity of 99% over 28, 56, 90, 180 and 365 days. Microstructural analyses were performed to evaluate the degradation of the jute yarn and the fiber-matrix interphase using an environmental scanning electron microscope. Thermogravimetric analysis was carried out in order to evaluate the calcium hydroxide content. The pullout results showed that coated fabrics formed a stronger bond than did the uncoated. For ordinary Portland cement matrix the maximum fiber pullout force decreased up to 85% after six months of accelerated aging. In the MK matrix the degradation process was retarded substantially. Polymer coatings improved the bond between fiber and matrix and reduced fiber degradation.
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