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

IF 4 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Steel and Composite Structures Pub Date : 2021-01-01 DOI:10.12989/SCS.2021.38.3.241

Ren Rui, Liangjie Qi, J. Xue, Z. Xin, Hui Ma, Xiguang Liu, T. Ozbakkaloglu

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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.

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再生混凝土混凝土-钢粘结滑移性能试验研究

为了研究循环荷载作用下钢筋再生混凝土(SRRC)的界面粘结滑移行为，设计试验了13个循环加载试件和1个单调加载试件。试验结果表明:SRRC的平均粘结强度随着再生混凝土替代率的增加而降低，而粘结强度随着混凝土覆盖层厚度、体积配箍比和再生混凝土强度的增加而增加。循环加载试件的极限粘结强度显著低于单调加载试件(41%)。循环现象还表明，SRRC试件经历了无滑移阶段、初始滑移阶段、破坏阶段、粘结强度退化阶段和残余阶段，且所有试件的粘结滑移曲线形状基本一致。此外，本文还建立了SRRC特征粘结强度的计算公式，并通过实验结果进行了验证。

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来源期刊

Steel and Composite Structures 工程技术-材料科学：复合

CiteScore

8.50

自引率

19.60%

发文量

审稿时长

7.5 months

期刊介绍： Steel & Composite Structures, An International Journal, provides and excellent publication channel which reports the up-to-date research developments in the steel structures and steel-concrete composite structures, and FRP plated structures from the international steel community. The research results reported in this journal address all the aspects of theoretical and experimental research, including Buckling/Stability, Fatigue/Fracture, Fire Performance, Connections, Frames/Bridges, Plates/Shells, Composite Structural Components, Hybrid Structures, Fabrication/Maintenance, Design Codes, Dynamics/Vibrations, Nonferrous Metal Structures, Non-metalic plates, Analytical Methods. The Journal specially wishes to bridge the gap between the theoretical developments and practical applications for the benefits of both academic researchers and practicing engineers. In this light, contributions from the practicing engineers are especially welcome.