| 引用本文: | 叶涛萍,曹万林,董宏英,张益轩.锈蚀钢筋与高强再生混凝土的黏结性能试验[J].哈尔滨工业大学学报,2018,50(8):132.DOI:10.11918/j.issn.0367-6234.201706170 |
| YE Taoping,CAO Wanlin,DONG Hongying,ZHANG Yixuan.Bond behavior between corroded steel bars and high-strength recycled concrete[J].Journal of Harbin Institute of Technology,2018,50(8):132.DOI:10.11918/j.issn.0367-6234.201706170 |
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| 摘要: |
| 为研究锈蚀钢筋与高强再生混凝土之间的黏结滑移性能，采用通电加速锈蚀法获得36个中心拉拔钢筋被锈蚀的试件并进行中心拉拔试验.试件设计参数有5个：再生粗骨料取代率、钢筋外形、钢筋直径、锚固长度和钢筋锈蚀率.依据试验结果，对试件的黏结破坏形态和每个设计参数对锈蚀钢筋与高强再生混凝土间黏结性能的影响进行分析.结果表明：锈蚀钢筋与高强再生混凝土间的黏结破坏形式有3种，即钢筋拔断、钢筋拔出和混凝土劈裂；高强再生混凝土与锈蚀后螺纹钢筋间的黏结强度要明显高于锈蚀后光圆钢筋；锈蚀钢筋与高强再生混凝土间的黏结强度，随着再生粗骨料取代率的增加整体呈减小趋势，随着钢筋直径的增大而减小，随着锚固长度的增大而减小，随着钢筋锈蚀率的增大而减小，但当钢筋锈蚀率达到某一界限后这种减小便不明显.
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| 关键词: 锈蚀钢筋 高强再生混凝土 黏结性能 拉拔试验 |
| DOI：10.11918/j.issn.0367-6234.201706170 |
| 分类号:TU528.01,TU317.1 |
| 文献标识码:A |
| 基金项目:国家重点研发计划(2017YFC0703304);国家自然科学基金重点资助项目(51438007) |
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| Bond behavior between corroded steel bars and high-strength recycled concrete |
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YE Taoping,CAO Wanlin,DONG Hongying,ZHANG Yixuan
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(Key Laboratory of Urban Security and Disaster Engineering (Beijing University of Technology), Ministry of Education, Beijing 100124, China)
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| Abstract: |
| To investigate the bond behavior between corroded steel bars and high-strength recycled concrete, a central pull-out test was carried on 36 specimens which were produced by electricity to accelerate corrosion. In this paper, the design parameters comprises replacement rate of recycled coarse aggregate, rebar shape, rebar diameter, anchorage length and corrosion rate of rebar. Based on the test results, the bond failure forms of specimens and the influences of each design parameter on the bond behavior between corroded steel bars and high-strength recycled concrete were analyzed. The results indicate that there are three failure forms in the failure process, including steel bar pull-off, steel bar pull-out and concrete splitting. The bond strength between high-strength recycled concrete and corroded rebar is obviously higher than that of corroded plain round bar. The bond strength decreases with the increase of replacement rate of recycled coarse aggregate, rebar diameter, anchorage length, and corrosion rate of rebar. When the bar corrosion rate reaches a certain value, the reduction of bond strength is not obvious.
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| Key words: corroded steel bar high-strength recycled concrete bond strength pull-out test |
