Experimental analysis on bond behavior between recycled concrete and corroded steel bars
Wang Chenxia , Wang Yu , Li Jinghong , Song Bo , Cao Fubo
DOI:
Received July 30, 2015,Revised , Accepted , Available online May 10, 2016
Volume ,2016,Pages 46-53
- Abstract
We carried out load testson five groups of recycled concrete beam specimens of different corrosion rates to explore the recycled concrete structure durability, The influence of rebar corrosion rate to was studied. 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.