Investigation on bond strength between recycled aggregate concrete (RAC) and steel tube in RAC-filled steel tubes
Investigation on bond strength between recycled aggregate concrete (RAC) and steel tube in RAC-filled steel tubes
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DOI：
10.1016/j.jcsr.2018.12.028
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发表时间：
2019-04-01
影响因子：
4.1
通讯作者：
Han, Lin-Hai
中科院分区：
文献类型：
--
作者：
Lyu, Wan-Qing;Han, Lin-Hai
本文综述了钢管混凝土和钢管再生骨料混凝土粘结性能的研究进展。对再生骨料混凝土-钢管混凝土的粘结性能进行了试验研究。对56个再生混凝土试件进行了一系列的推出试验，试验参数包括再生混凝土的截面类型、截面尺寸、强度、再生粗骨料取代率以及界面处理（涂油、磨光）等。根据试验结果，探讨了化学粘结、微观互锁和宏观互锁对粘结强度的影响机理。分析结果表明，截面形式和截面尺寸是影响钢管与再生混凝土芯粘结强度的两个主要参数。试验结果表明，RAC-FST的粘结性能与钢管混凝土（CFST）中的钢-混凝土界面粘结性能相似。最后，提出了计算核心混凝土与外钢管粘结强度的经验公式。(C)2019爱思唯尔有限公司版权所有。
This paper reviews the previous studies on bond behaviour of concrete-filled steel tubes (CFST) and recycled aggregate concrete-filled steel tubes (RAC-FST). The bond behaviour between the steel tube and the recycled aggregate concrete (RAC) of RAC-FST is experimentally investigated then. A series of push-out tests on 56 RAC-FST specimens are conducted with parameters of cross-section type, cross-sectional dimension, strength of RAC, replacement rate of recycled coarse aggregate and interface treatment (i.e. oilin, polishing). Mechanism of the effects of chemical adhesion, micro-interlocking and macro-interlocking on the bond strength is discussed and investigated based on the testing results. The analytical results show that the cross-section type and cross-sectional dimension are two main parameters that influence the bond strength between the steel tube and the RAC core. It can be concluded that, in general, the bond behavior of the RAC-FST is similar to that of the steel-concrete surface in concrete-filled steel tubes (CFST). Finally, empirical formulas are proposed for the calculations of the bond strength between the core concrete and the outer steel tubes. (C) 2019 Elsevier Ltd. All rights reserved.