Concrete-steel bond-slip behavior of recycled concrete: Experimental investigation

Rui Ren, Liangjie Qi, Jianyang Xue, Xin Zhang, Hui Ma, Xiguang Liu and Togay Ozbakkaloglu

Abstract

In order to study the interfacial bond-slip behavior of steel reinforced recycled concrete (SRRC) under cyclic loading, thirteen specimens were designed and tested under cyclic loading and one under monotonic loading. The test results indicated that the average bond strength of SRRC decreased with the increasing replacement ratio of recycled concrete, whereas the bond strength increased with an increase in the concrete cover thickness, the volumetric stirrup ratio, and the strength of recycled concrete. The ultimate bond strength of the cyclically-loaded specimen was significantly (41%) lower than that of the companion monotonically-loaded specimen. The cyclic phenomena also showed that SRRC specimens went through the non-slip phase, initial slip phase, failure phase, bond strength degradation phase and residual phase, with all specimens exhibiting basically the same shape of the bond-slip curve. Additionally, the paper presents the equations that were developed to calculate the characteristic bond strength of SRRC, which were verified based on experimental results.

Key Words

steel reinforced recycled concrete (SRRC); bond-slip behavior; cyclic loading; bond strength; replacement ratio of recycled concrete

Address

Rui Ren, Liangjie Qi, Jianyang Xue and Xiguang Liu: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi'an 710055, China Xin Zhang: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi;an 710055, China Hui Ma: School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China Togay Ozbakkaloglu: Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA

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