Abstract
In order to assess the bond behavior of deformed steel rebars in recycled-aggregate concrete (RAC) incorporating both fine and coarse recycled aggregate, pull-out tests were carried out in this study on 16-mm diameter deformed steel rebars embedded concentrically in RAC. The concrete was designed using equivalently mixed proportions of both recycled coarse aggregate and recycled fine aggregate. The tests employed five types of recycled aggregate replacement combinations and three types of rebar placement orientation (i.e., vertical bars and two-tiered and three-tiered horizontal bars). Based on the pull-out test results, the maximum bond strength tended to decrease and the slip at the maximum bond strength increased as the average water absorption of the aggregate increased, irrespective of the rebar orientation or placement location within the concrete member. The pull-out test results for the horizontal steel rebars embedded in RAC indicate that the casting position effect could be determined from the mid-depth of the concrete member, irrespective of the member’s height. The normalized bond versus slip relationship between the deformed rebar and the RAC could be predicted using an empirical model based on regression analysis of the experimental data.
Highlights
The construction industry is resource intensive and often relies on extensive use of natural resources
In Korea, numerous old apartments buildings built in the 1970s have been demolished, and the difficulties associated with the disposal of the construction waste have caused major environmental problems, including soil/water pollution issues
The aims aims of of this this study study were were to to investigate investigate the the comparative comparative effects effects of on bond bond behavior behavior of of deformed deformed steel rebars and ready-mixed recycled-aggregate concrete (RAC), of both both recycled aggregate (RCA)
Summary
The construction industry is resource intensive and often relies on extensive use of natural resources. To the number of studies on recycled aggregate (RCA), research not field, results. Due of to studies the difficulty in producing aggregate (RCA), research on concrete with recycled fine aggregate (RFA) [9,10,11,12,13] is scant due to the high-quality fine aggregates. In terms the bond strength-slip relationship steel rebar and RAC, studies [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. This paper investigates the bonding behavior between deformed steel rebars of and concrete containing 75% replacement of a blend of RCA and RFA (i.e., RCA + RFA).
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