混凝土中钢筋锈胀分布式光纤监测试验研究

采用布里渊光时域反射测量技术（BOTDR）,对混凝土中钢筋锈蚀引起的混凝土膨胀进行了在线分布式光纤监测试验研究。在质量分数为5%的氯化钠溶液中放置两个钢筋混凝土柱模型,并对其中一个混凝土柱中的钢筋通电加速其锈蚀,然后通过BOTDR得到的分布式监测数据对比两者的锈蚀变形。试验结果表明,基于BOTDR的分布式光纤监测技术,能够有效地定量监测钢筋锈蚀引起的外围混凝土膨胀变形的过程,尤其对于钢筋的非均匀锈蚀,这一技术更显示出其突出优越性,为混凝土中钢筋锈蚀监测提供了一种新的技术和方法。

An Experimental Study on the Distributed Monitoring of the Corrosion Expansion of Reinforcing Steel in Concrete Using BOTDR

Based on the Brillouin optical time domain reflectometer（BOTDR）,the reinforcing steel corrosion induced concrete expansion is studied.By placing two concrete cylinders in the sodium chloride solution（the concentration of sodium chloride is 5% by mass）,and the reinforcing steel is energized.The diversification of the galvanic reinforcing steel and un-galvanic reinforcing steel concrete cylinders is compared.The experimental data indicate that BOTDR can monitor the reinforcing steel corrosion caused outer concrete expansion process effectively,especially for the un-uniform reinforcing steel corrosion,the variation pattern of concrete deformation in different regions of the cylinder is greatly reported by the BOTDR which demonstrates the superiority of the reinforcing steel corrosion monitoring by using of the distributed monitoring method,and it is expected to be a new way of reinforcing steel corrosion monitoring.