| 摘要: |
| 制作了3组配置钢筋直径分别为12、16、20mm的砂浆圆柱试件，对其进行钢筋加速锈蚀试验.将光频域反射计(OFDR)分布式光纤以螺距为100mm的螺旋线方式缠绕在砂浆试件上，通过获取砂浆表面应变来监测钢筋的锈蚀情况.结果表明：钢筋锈蚀导致砂浆保护层开裂，进而引起OFDR应变谱出现峰值；随着钢筋锈蚀损失的增大，应变峰值随之增大；相同锈蚀情况下，保护层越小（或钢筋直径越大），砂浆试件的裂缝开裂速率就越大，同时裂缝宽度也越大. |
| 关键词: 分布式光纤 钢筋锈蚀 砂浆 锈蚀监测 |
| DOI：103969/j.issn.1007 9629202006035 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51878119，51738007)；“十三五”国家重点研发计划项目(2016YFC0701108) |
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| Monitoring of Reinforcement Steel Corrosion Based on OFDR Distributed Optical Fiber |
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TIAN Hao, TANG Fujian, LI Hongnan
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School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| Three cylindrical mortar specimens containing 12, 16， 20mm diameter reinforcement steels were fabricated, and optical fiber was wrapped around the mortar cylinder in a spiral mode with a spacing of 100mm. Three specimens were subjected to accelerated corrosion test. Reinforcement steel corrosion was monitored with optical frequency domain reflectometer(OFDR) distributed optical fiber. During the accelerated corrosion test, strain data on the mortar surface induced by reinforcement steel corrosion were collected with OFDR optical fiber. Results show that corrosion of reinforcement steels causes surface cracking of mortar protective layer and results in appearance of strain peaks along the OFDR fiber. The magnitude of strain peak increases with an increase of corrosion induced mass loss of reinforcement steel. At the same corrosion level, thinner protective layer (or bigger reinforcement steel) causes a higher cracking rate and consequently a bigger crack width. |
| Key words: distributed optical fiber reinforcement steel corrosion mortar corrosion monitoring |
