Bond behavior between steel reinforcement and recycled concrete
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In this paper the bond behavior of recycled aggregate concrete was characterized by replacing different percentages of natural coarse aggregate with recycled coarse aggregate (20, 50 and 100 %). The results made it possible to establish the differences between the conventional concrete bond strength and the recycled concrete bond strength depending on the replacement percentage. It was thus found that bond stress decreases with the increase of the percentage of recycled coarse aggregate used. In order to define the influence of recycled aggregate content on bond behavior, normalized bond strength was calculated taking into account the reduced compressive strength of the recycled concretes. Finally, using the experimental results, a modified expression for maximum bond stress (bond strength) prediction was developed, taking into account replacement percentage and compressive strength. The obtained results show that the equation proposed provides an experimental value to theoretical prediction ratio similar to that of conventional concrete.
KeywordsRecycled concrete Bond strength Pull-out test Normalized bond strength Time-dependent compressive strength Steel reinforcement
The study is part of two projects entitled:.
“Clean, efficient and nice construction along its life cycle (CLEAM)” funded by the Centre for the Technology and Industrial Development (CDTI) and led by the Group of Economical Interest CLEAM-CENIT, AIE comprising by the country’s largest construction companies (Acciona, Dragados, Ferrovial, FCC, Isolux Corsán, OHL and Sacyr) and some PYME (Informática 68, Quilosa and Martínez Segovia y asociados).
“Bond and anchorage of passive reinforcement steel in concrete (ADHAN)” funded by the Ministry of Science and Innovation.
The experimental program was carried out at the Construction laboratories of Technological Innovation Centre of Building and Civil Engineering (CITEEC) and Civil Engineering School, of A Coruña University.
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