The limitation of the crack width is of central importance for the design in the serviceability limit state. For FRP‐reinforced concrete members, the crack width has to be limited for service condition in use and not due to corrosion protection. In this paper, an experimental program of pull‐out tests and slender concrete cylinders with basalt fiber‐reinforced polymer rebars under centric tension load is presented. The used basalt fiber‐reinforced polymer rebars are sand coated and have in addition a helically wrapped thread for a decent profiling. Equations to calculate crack spacing and crack width of FRP‐reinforced concrete is derived and calibrated with the obtained experimental results. Finally, the equations are verified with experimental data from other authors and a crack model is given for reinforced concrete members with FRP rebars with a helically wrapped and sand coated surface.

中文翻译：

---

玄武岩纤维增强聚合物混凝土的开裂行为：确定裂缝间距和裂缝宽度的方法

在可使用性极限状态下，裂纹宽度的限制对于设计至关重要。对于FRP钢筋混凝土构件，裂缝宽度必须根据使用条件加以限制，而不是出于腐蚀保护的考虑。在本文中，提出了一个拉力试验和带有玄武岩纤维增强聚合物钢筋的细长混凝土圆筒在中心拉力作用下的试验程序。所使用的玄武岩纤维增强聚合物钢筋经过砂磨，并另外具有螺旋缠绕的螺纹，以实现良好的轮廓。推导了计算FRP钢筋混凝土裂缝间距和裂缝宽度的方程式，并根据获得的实验结果进行了校准。最后，