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Bond durability of BFRP bars embedded in concrete with fly ash in aggressive environments

机译：BFRP棒嵌入混凝土中的BFRP耐用性，粉煤灰在侵略性环境中

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摘要

Fiber-reinforced polymer (FRP) bars are an environmentally friendly alternative to steel and are considered ideal substitutes for steel reinforcement in marine concrete structures due to their excellent resistance to chloride ions and mechanical properties. However, the strong alkaline environment in concrete results in the degradation of FRP bars, and the degradation of FRP bars is detrimental to the long-term performance of these structures due to the decrease in interfacial bonding. This study aims to investigate the bond durability of basalt FRP (BFRP) bar and concrete with or without fly ash in corrosion environments by pull-out tests. The laboratory-accelerated aging environments are an alkaline solution (pH 12.8 +/- 0.2) and simulated seawater, and the immersion temperatures are set at room temperature (similar to 26 degrees C), 40 degrees C, and 60 degrees C. Furthermore, the mechanical properties of the BFRP bars are also determined under the same conditions. Results indicate that the mechanical properties of the BFRP bars and the bond strength decrease as the immersion time increases. The addition of fly ash in concrete can improve the interfacial bond strength. For instance, the bond strength of BFRP-ordinary concrete decreases by 69.0% when immersed in a 60 degrees C alkaline solution for 6 months, and that of BFRP-fly ash concrete decreases by 58.1% in the same immersion environment. The similar experimental phenomenon can also be obtained in seawater, which can be attributed to fly ash refining the concrete pores and inhibiting the reaction of alkaline with silica contained in the basalt fibers. Finally, the retention of bond strength is predicted based on the apparent horizontal shear strength of the BFRP.
机译：纤维增强聚合物（FRP）棒是钢的环保替代品，由于其对氯离子和机械性能优异的抗性而被认为是船舶混凝土结构中的钢筋增强的理想替代品。然而，混凝土中的强碱性环境导致FRP条的降解，由于界面粘合的降低，FRP棒的降解对这些结构的长期性能有害。本研究旨在通过拉出试验研究玄武岩FRP（BFRP）棒（BFRP）棒（BFRP）棒（BFRP）棒（BFRP）棒和混凝土的粘合耐久性。实验室加速的老化环境是碱性溶液（pH12.8 +/- 0.2）和模拟海水，浸入温度设定在室温（类似于26℃），40℃和60℃。此外， BFRP条的机械性能也在相同的条件下确定。结果表明，随着浸入时间的增加，BFRP条的机械性能和粘合强度降低。混凝土中的粉煤灰加入可以提高界面粘合强度。例如，当浸入60℃碱性溶液中6个月浸入60℃的碱性溶液中，BFRP-普通混凝土的粘合强度降低了69.0％，并且BFRP-Fly Ash混凝土中的BFRP粉煤灰混凝土在相同的浸入环境中降低了58.1％。在海水中也可以获得类似的实验现象，其可归因于粉煤灰精制混凝土孔并抑制碱性与玄武岩中含有的二氧化硅的反应。最后，基于BFRP的表观水平剪切强度来预测粘合强度的保留。

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  • 来源
    《Composite Structures》 |2021年第9期|114121.1-114121.12|共12页
  • 作者

    Lu Zhongyu; Su Lizhu; Lai Jiawei; Xie Jianhe; Yuan Bing;

  • 作者单位

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 510006 Guangdong Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    BFRP bar; Interface bonding; Durability; Fly ash; Improving performance;

    机译：BFRP栏;界面粘合;耐久性;粉煤灰;提高性能;

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