Experimental and analytical study of bond between basalt FRP bars and geopolymer concrete
Experimental and analytical study of bond between basalt FRP bars and geopolymer concrete
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DOI：
10.1016/j.conbuildmat.2021.125461
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发表时间：
2021-12-01
影响因子：
7.4
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Trabacchin, Giulia;Sebastian, Wendel;Zhang, Mingzhong
本文对地质聚合物混凝土（GPC）中玄武岩纤维增强聚合物（BFRP）棒的粘结行为进行了实验和分析研究。对嵌入 GPC 立方体中的带肋 BFRP 棒进行了拉拔试验，考虑了不同的棒直径（6、8 和 10 mm）和嵌入长度（5db、10db 和 15db），以研究它们对粘结滑移响应、粘结强度和失效机制方面的粘结行为的影响。结果表明，化学粘附力较低，并且粘合主要依赖于机械互锁，当 GPC 局部压碎发生拉拔时，机械互锁停止，而 BFRP 肋保持未损坏，表明肋剪切强度较高。使用理论双线性模型来描述局部粘结-滑移关系和粘结界面特性。存在非线性键合应力分布，特别是对于较长的嵌入长度和较低的负载水平（键合应力集中系数为 3.9）。通过参数化研究估算了棒材直径、嵌入长度和弹性模量对最大拉拔载荷的影响，在此基础上探讨了BFRP棒材与GPC之间的载荷传递机制，并与实验数据进行比较，提出了粘结强度预测公式。
This paper presents an experimental and analytical study of the bond behaviour of basalt fibre reinforced polymer (BFRP) bars in geopolymer concrete (GPC). Pull-out tests were conducted on ribbed BFRP bars embedded in GPC cubes considering different bar diameters (6, 8 and 10 mm) and embedment lengths (5db, 10db and 15db) to investigate their effects on bond behaviour in terms of bond-slip response, bond strength and failure mechanisms. Results indicate that the chemical adhesion is low, and the bond is mainly dependent on mechanical interlocking which stopped when pullout occurred by local crushing of the GPC with the BFRP ribs remaining undamaged, suggesting high rib shear strength. A theoretical bilinear model was used to describe the local bond-slip relationship and the bond interface properties. There exists nonlinear bond stress distribution, especially for longer embedment lengths and lower load levels with a bond stress concentration factor of 3.9. A parametric study was performed to estimate the influences of bar diameter, embedment length and elastic modulus on maximum pull-out load, based on which the load transfer mechanisms between BFRP bars and GPC were explored, and a formula for predicting the bond strength was proposed in comparison with experimental data.