Abstract
Introduction: Full-recycled-aggregate concrete (aRAC) is a new concrete reusing 100% fine and coarse recycled aggregates produced from waste concrete of demolished concrete structures. As there is a lack of studies on the bond behavior between steel bar and aRAC, findings of this study are of significance for the structural application of aRAC. Method: This paper presents the pull-out test results of 24 groups aRAC specimens with deformed steel bar, and discusses the effects of aRAC strength, bond length and lateral constructional stirrups on the bond behavior between deformed steel bar and aRAC. Results and Conclusion: The bond stress and slip at key points of bond-slip curve are analyzed in relation to the tensile strength of aRAC and the bond length of steel bar. The bond-slip relationship between deformed steel bar and aRAC is proposed based on the test and analysis of this study.
Highlights
Full-recycled-aggregate concrete is a new concrete reusing 100% fine and coarse recycled aggregates produced from waste concrete of demolished concrete structures
With the increase of slip, the aggregate concrete (aRAC) in front of ribs of steel bar became the main actor bearing pull-out load, the bond stress continuously increased with some nonlinear properties of aRAC under the shear-compression, the nonlinear behavior appeared on bond-slip curve in the slip segment
When the bond length of steel bar was shorter than 10d, specimens without lateral constructional stirrups failed mostly due to the aRAC splitting
Summary
Full-recycled-aggregate concrete (aRAC) is a new concrete reusing 100% fine and coarse recycled aggregates produced from waste concrete of demolished concrete structures. An approach is to crush the waste concrete from demolished concrete structures to obtain recycled concrete aggregate (RCA) for the production of a new concrete, commonly known as recycled aggregate concrete (RAC) [1 - 4]. Study and application of RAC have drawn global attention in accordance with the green and sustainable construction [5 - 10]. The special characteristics of coarse RCA differ from naturnal aggregate such as rough surface with certain amount of old cement mortar attached, low density, and high and quick water absorption, having certain effects on the properties of RAC.
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