Li Jianzhi, Zhao Yiyao, Wang Junjie
Structure Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
School of Materials, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Micromachines (Basel). 2021 Nov 26;12(12):1451. doi: 10.3390/mi12121451.
This paper proposes a novel spiral-wound, optic-fiber sensor to monitor the corrosion of steel bars. At the same time, the winding parameters, such as winding angle and pitch, were first theoretically deduced. Then, to decrease light loss, a practically distributed sensor wound onto the protective mortar layer was developed by increasing the winding curvature radius. The spiral distributed sensors were experimentally verified for their feasibility. Experimental results showed that the spiral fiber strain depended on the thickness of the protective mortar layer. Furthermore, the spiral distributed strain well reflected the cracking process of concrete. In addition, the concrete cracking time depended on the thickness of the protective concrete layer. Accordingly, this method is feasible for evaluating the initial and final cracking behaviors of concrete structures and provides a sight for steel bar corrosion.
本文提出了一种用于监测钢筋腐蚀情况的新型螺旋缠绕光纤传感器。同时，首次从理论上推导了诸如缠绕角度和螺距等缠绕参数。然后，为减少光损耗，通过增大缠绕曲率半径开发了一种缠绕在防护砂浆层上的实际分布式传感器。对螺旋分布式传感器的可行性进行了实验验证。实验结果表明，螺旋光纤应变取决于防护砂浆层的厚度。此外，螺旋分布式应变能很好地反映混凝土的开裂过程。另外，混凝土的开裂时间取决于防护混凝土层的厚度。因此，该方法对于评估混凝土结构的初始和最终开裂行为是可行的，并为钢筋腐蚀提供了一种观测手段。
