Abstract The article describes an experimental study on the bond–slip performance between the pultruded glass fiber-reinforced polymer (GFRP) tube and the nano-CaCO3 concrete. Taking the nano-CaCO3 concrete strength and GFRP tube thickness as primary parameters, nine specimens were designed and tested to study the influence of these parameters on the bond strength of the specimens. Besides, three specimens filled with the ordinary concrete were also tested by using the push-out tests to make comparisons with the bond performance of the specimens filled with nano-CaCO3 concrete. A total of four push-out tests were conducted on each specimen. The experimental results indicate that there are two types of axial load–slip curves for each specimen in four push-out tests. Moreover, comparison of the results of the push-out tests in the same direction shows that the bond failure load of the specimen decreases with the increase in the number of push-out tests. Based on the analysis of the test results, it is shown that the bond performance between the GFRP tube and the nano-CaCO3 concrete is better than that between the GFRP tube and the ordinary concrete. Furthermore, as the nano-CaCO3 concrete strength increases, the bond strength of the specimens decreases, indicating that the concrete strength has a negative effect on the bond strength. When the nano-CaCO3 concrete strength is relatively smaller (C20), the bond strength of the specimens decreases with the increase in the thickness of the GFRP tube. However, when the nano-CaCO3 concrete strength is relatively larger (C30 and C40), the bond strength of the specimens increases as the thickness of the GFRP tube increases.

中文翻译：

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拉挤玻璃纤维增​​强聚合物管与纳米CaCO3混凝土粘结滑移性能研究

摘要 本文描述了拉挤玻璃纤维增​​强聚合物 (GFRP) 管与纳米 CaCO3 混凝土之间粘结滑移性能的实验研究。以纳米CaCO3混凝土强度和GFRP管厚度为主要参数，设计并测试了9个试件，研究了这些参数对试件粘结强度的影响。此外，还通过推出试验对三个普通混凝土填充试件进行了测试，与填充纳米CaCO3混凝土的试件的粘结性能进行了比较。每个试样总共进行四次推出试验。实验结果表明，在四次推出试验中，每个试件有两种类型的轴向载荷-滑移曲线。而且，同方向顶出试验结果对比表明，随着顶出试验次数的增加，试件的粘结破坏载荷减小。对试验结果的分析表明，GFRP管与纳米CaCO3混凝土的粘结性能优于GFRP管与普通混凝土的粘结性能。此外，随着纳米碳酸钙混凝土强度的增加，试件的粘结强度降低，表明混凝土强度对粘结强度有负面影响。当纳米CaCO3混凝土强度相对较小（C20）时，试件的粘结强度随着GFRP管厚度的增加而降低。但当纳米CaCO3混凝土强度相对较大时（C30和C40），