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Materials 2017, 10(9), 1082; doi:10.3390/ma10091082

Bonding Behavior of Deformed Steel Rebars in Sustainable Concrete Containing both Fine and Coarse Recycled Aggregates

1
Department of Construction Engineering Education, Chungnam National University, Daejeon 34134, Korea
2
Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Received: 15 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 14 September 2017
(This article belongs to the Special Issue Recycled Materials, Eco-design and 3D Printing)
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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. View Full-Text
Keywords: recycled aggregate concrete; pull-out test; bond strength; slip; casting position effect recycled aggregate concrete; pull-out test; bond strength; slip; casting position effect
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MDPI and ACS Style

Kim, S.-W.; Park, W.-S.; Jang, Y.-I.; Jang, S.-J.; Yun, H.-D. Bonding Behavior of Deformed Steel Rebars in Sustainable Concrete Containing both Fine and Coarse Recycled Aggregates. Materials 2017, 10, 1082.

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