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Flexural behavior of GFRP bar-reinforced calcium aluminate cement concrete beams containing forta-ferro fibers in acidic environment
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-09-11 , DOI: 10.1016/j.conbuildmat.2020.120602
Javad Dashti , Mahdi Nematzadeh

The present study is dedicated to investigating the effects of Forta-Ferro (FF) fiber and calcium aluminate cement (CAC) on the flexural behavior of concrete beams reinforced with glass fiber-reinforced polymer (GFRP) rebars subjected to acid attack. Bending tests were designed to assess the effects of the acidic environment, replacement of ordinary Portland cement (OPC) with CAC, and the addition of FF fibers on the flexural strength, the load-deflection curve, and the cracking behavior of the beam specimens. Based on the results, the optimum content of FF fibers for improving the mechanical properties of concrete, as well as the flexural behavior of beams, is 0.4%. Further, using 0.7% FF fibers proved to be very effective in controlling the mechanical strength reduction of concrete and the flexural strength of beams immersed in acid. In addition, substituting CAC for OPC enhanced the ultimate flexural capacity of the beams with and without immersion in acid. With regard to cracking behavior, the presence of FF fibers, the exposure of specimens to acid, and the replacement of OPC with CAC reduced the average width and spacing of cracks and increased the number of cracks in the beams.



中文翻译:

GFRP筋增强铝酸钙水泥混凝土梁在酸性环境下的抗弯性能

本研究致力于研究Forta-Ferro(FF)纤维和铝酸钙水泥(CAC)对玻璃纤维增​​强聚合物(GFRP)钢筋遭受酸侵蚀的混凝土梁的抗弯性能的影响。设计弯曲试验来评估酸性环境,用CAC代替普通波特兰水泥(OPC)以及添加FF纤维对梁试样的抗弯强度,载荷-挠度曲线和开裂行为的影响。根据结果​​,用于改善混凝土的机械性能以及梁的抗弯性能的FF纤维的最佳含量为0.4%。此外,事实证明,使用0.7%FF纤维对控制混凝土的机械强度降低和浸入酸中的梁的抗折强度非常有效。此外,用CAC代替OPC增强了梁的极限抗弯能力,无论是否浸入酸中。关于开裂行为,FF纤维的存在,试样暴露于酸中以及用CAC代替OPC减小了裂缝的平均宽度和间距,并增加了梁中的裂缝数量。

更新日期:2020-09-11
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