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再生混凝土与锈蚀钢筋间的粘结性能试验研究
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基金项目:

内蒙古自然科学基金(2014MS0551、2015MS0552);内蒙古自治区高等学校科学研究项目(NJZY159);包市科技计划项目(2014X1009)


Experimental analysis on bond behavior between recycled concrete and corroded steel bars
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Fund Project:

Natural Science Foundation of Inner Mongolia(No.2014MS0551，2015MS0552)； Scientific Research Project for Higher University of Inner Mongolia Autonomous Region(No.NJZY159)；Science and Technology Plan Projects of Baotou(No.2014X1009)

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    摘要:

    为了探究再生混凝土结构的耐久性能,对5组不同钢筋锈蚀率(0~9%)的再生混凝土梁式试件进行加载试验。分析不同钢筋锈蚀率对再生混凝土梁式试件的钢筋应变、局部粘结应力、粘结滑移和极限粘结应力的影响。结果表明:钢筋锈蚀率大于3%时试件底部开始有细微锈胀裂缝出现;锈蚀率越大,荷载作用下钢筋应变沿锚固位置的变化曲线越平缓;局部粘结应力沿锚固段呈现出双峰分布,峰值主要集中在加载端和自由端附近;加载端附近位置滑移现象最先发生,远离加载端滑移现象延后;随着钢筋锈蚀率的增大,极限粘结强度先增加后降低,极限荷载下的滑移值增大。

    Abstract:

    We carried out load testson five groups of recycled concrete beam specimens of different corrosion rates to explore the recycled concrete structure durability,and analyzed the influence of different corrosion rates on steel bar strain,local bond stress, load-slip and the ultimate bond stress of recycle concrete beam specimens. The results show that lightly corrosive cracks appeared in the bottom of the beam when rebar corrosion rate was greater than 3%.The strain curve was flat when the corrosion rate of reinforcing steel bar was greater with the anchor position under the breaking load. The distribution of local bond stress along the anchor section was bimodal distribution, and peak mainly concentrated near the loading end and the free end. The slippage phenomenon happened first on the position near the loading end, and delayed away from the loading end. With the increase of rebar corrosion rate, ultimate bond strength increased first and then reduced and slip value increased under the ultimate load.

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引用本文

王晨霞,王宇,李敬红,宋波,曹芙波.再生混凝土与锈蚀钢筋间的粘结性能试验研究[J].土木与环境工程学报（中英文）,2016,38(1):46-53. Wang Chenxia, Wang Yu, Li Jinghong, Song Bo, Cao Fubo. Experimental analysis on bond behavior between recycled concrete and corroded steel bars[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2016,38(1):46-53.10.11835/j. issn.1674-4764.2016.01.007

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  • 收稿日期:2015-07-30
  • 在线发布日期: 2016-03-01
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