RESEARCH ARTICLE


Confined Expansion and Bond Property of Micro-Expansive Concrete- Filled Steel Tube Columns



Xu Kai-Cheng1, 2, Chen Meng-Cheng*, 2, Yuan Fang2
1 School of Architecture and Civil Engineering, Nanchang University, Nanchang 330031, China
2 School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China


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Creative Commons License
© 2011 Kai-Cheng et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China; Tel: +86-791-7046085; Fax: +86-791-7046027; E-mail: xkcxj@163.Com


Abstract

The shrinkage/expansion behavior and bond carrying capacities were investigated through 4 micro-expensive concrete-filled steel tube(MCFST) and 3 conventional concrete-filled steel tube(CFST) short columns. The results show that the temperature field in MCFST is similar to that of ordinary concrete members. Concrete core has obvious effect on shrinkage-compensating with the addition of swelling agent. Pre-stress is produced in the core concrete when it is confined by the steel tube. Both water cement ratio and expansive agent have obvious influence on expansive behaviors of MCFST. The tests also indicate that the pre-stress in core concrete can improve bond strength of core concrete and steel tube of MCFST columns and proposed a new method to improve the interface bond strength of composite structures.

Keywords: Hydration heat, shrinkage/expansion behavior, bond strength, micro-expansive.