Bond performance between BFRP bars and 3D printed concrete
Bond performance between BFRP bars and 3D printed concrete
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DOI：
10.1016/j.conbuildmat.2020.121325
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发表时间：
2020-10
影响因子：
7.4
通讯作者：
Xiaoyan Sun;Gao Chao;Hailong Wang
中科院分区：
文献类型：
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作者：
Xiaoyan Sun;Gao Chao;Hailong Wang
为了改进三维（3D）打印混凝土结构的设计和施工，通过拉拔试验分析了玄武岩纤维增强聚合物（BFRP）钢筋与3D打印混凝土之间的粘结性能。研究发现，3D打印试件粘结强度低于模铸试件，而BFRP筋打印混凝土的破坏模式与普通钢筋混凝土相似。涂砂BFRP筋与3D打印混凝土的粘结性优于光滑筋。混凝土的打印方向对粘结性能也有影响，平行和45°倾斜试件的粘结强度大于垂直打印试件。通过对打印界面和粘结界面缺陷的识别，确定了粘结降解机理。建立了连续粘结-滑移模型，对BFRP筋与打印混凝土的粘结强度进行了预测，与试验结果吻合较好。
To improve the design and construction of three-dimensional (3D) printed concrete structures, the bond performance between basalt fibre reinforced polymer (BFRP) bars and 3D printed concrete were analysed via pull-out tests. It is found that the bond strength of 3D printed specimens was lower than that of mould-cast specimens, while the failure mode of BFRP bar-reinforced printed concrete was similar to that of reinforced common concrete. The bonding of sand-coated BFRP bars to 3D printed concrete was superior to that of smooth bars. The printing direction of concrete also affected bond performance, with the bond strengths of parallel and 45° inclined specimens exceeding that of vertically printed specimens. By identifying defects at printed and bonding interfaces, the bond degradation mechanism was determined. Furthermore, a continuous bond–slip model was established to predict the bonding strength between BFRP bars and printed concrete, which agreed well with the experimental results.