Compressive behavior for recycled aggregate concrete confined with recycled polyethylene naphthalate/terephthalate composites
Compressive behavior for recycled aggregate concrete confined with recycled polyethylene naphthalate/terephthalate composites
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再生聚萘二甲酸/对苯二甲酸酯复合材料约束的再生骨料混凝土的压缩行为
DOI：
10.1016/j.conbuildmat.2020.120498
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发表时间：
2020-11-20
影响因子：
7.4
通讯作者：
Du, Xiu-Li
中科院分区：
文献类型：
--
作者：
Han, Qiang;Yuan, Wan-Ying;Du, Xiu-Li
环保再生骨料混凝土（RAC）是天然骨料混凝土（NAC）的良好替代品。RAC的性能差（例如，相对于NAC的强度较低）限制了其工程应用，可以通过纤维增强聚合物（FRP）的侧向约束来改善。近年来出现的一种新型玻璃钢，由回收的聚萘二甲酸乙二醇酯(PEN)/对苯二甲酸乙二醇酯（PET）纤维制成，具有较大的断裂应变（LRS，一般大于5%）。它是理想的限制RAC，特别是满足结构在地震带的延性要求。在这项研究中，40 RAC圆形试样包裹LRS FRP进行单调压缩性能测试。对再生粗骨料的替代率和FRP的约束刚度进行了试验研究。试验结果表明，RAC抗压强度和应变的提高主要受约束刚度的影响，而替代率对其影响较小。此外，研究结果表明，作者小组先前建立的LRS fr - prestricted RAC面向设计和面向分析的模型对LRS fr - prestricted RAC具有满意的预测性能。这些发现不仅为LRS frp约束RAC构件的设计提供了指导，而且还指出了可持续结构体系发展的可能性。(C) 2020 Elsevier Ltd.版权所有。
Environmentally friendly recycled aggregate concrete (RAC) is a good alternative to natural aggregate concrete (NAC). The poor performance of RAC (e.g., relatively lower strength than its NAC counterpart) that limits its engineering application can be improved by the lateral confinement of fiber-reinforced polymer (FRP). A new type of FRP emerged in recent years and made from recycled polyethylene naphthalate (PEN)/terephthalate (PET) fibers has a large rupture strain (LRS, typically greater than 5%). It is ideal for confining RAC, especially to satisfy the ductility requirements of structures in earthquake zones. In this study, 40 RAC circular specimens wrapped with LRS FRP were tested for monotonic compressive behavior. The replacement ratio of recycled coarse aggregate and the confinement stiffness of FRP were experimentally studied. Test results indicate that the enhancement of compressive strength and strain of RAC is mainly affected by the confinement stiffness, but marginally affected by the replacement ratio. Furthermore, the results show that the design-oriented model and analysis-oriented model previously developed by the authors' group for LRS FRP-confined NAC, can present satisfactory predication performance on LRS FR-Pconfined RAC. These findings not only provide design guidance for LRS FRP-confined RAC members, but also point to the possibility of the development of a sustainable structural system. (C) 2020 Elsevier Ltd. All rights reserved.