Mechanical behavior of recycled aggregate concrete-filled steel tube stub columns after exposure to elevated temperatures

Wengui Li; Zhiyu Luo; Zhong Tao; Wen Hui Duan; Surendra P. Shah

doi:10.1016/j.conbuildmat.2017.04.118

Mechanical behavior of recycled aggregate concrete-filled steel tube stub columns after exposure to elevated temperatures

Wengui Li^*, Zhiyu Luo, Zhong Tao, Wen Hui Duan, Surendra P. Shah

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

93 Scopus citations

Abstract

The compressive mechanical behaviors of recycled aggregate concrete-filled steel tube (RACFST) stub columns after exposure to elevated temperatures were experimentally investigated in this study. The RACFST stub columns incorporating different recycled coarse aggregate (RCA) replacement ratios of 0, 50% and 100% were heated under elevated temperatures of 200 °C, 500 °C, and 700 °C. The results show that the compressive strength and elastic modulus of RACFST columns were relatively inferior to those of the corresponding natural aggregate concrete-filled steel tube (NACFST) columns after exposure to the same elevated temperatures, and the degradations became more pronounced with increasing RCA replacement ratio and higher temperature. This phenomenon might be attributed to the lower resistance of recycled aggregate concrete (RAC) than natural aggregate concrete (NAC) when was exposed to elevated temperatures. However, after elevated temperature exposure, the peak strain of RACFST stub column was relatively higher than that of the NACFST counterpart. Degradation regression formulas of mechanical properties and deformation behaviors of RACFST stub columns after exposure to elevated temperatures were proposed and agreed well with the experimental results.

Original language	English (US)
Pages (from-to)	571-581
Number of pages	11
Journal	Construction and Building Materials
Volume	146
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.04.118
State	Published - Aug 15 2017

Funding

The authors gratefully acknowledge the financial supports of the Australian Research Council Discovery Early Career Researcher Award (DE150101751) and Australian Research Council Research Hub for Nanoscience Based Construction Materials Manufacturing (IH150100006). The authors are also grateful for the financial supports of the National Natural Science Foundation of China (51408210) and University of Technology Sydney grants (Blue Sky Research Scheme and Early Career Researcher), Australia.

Keywords

Compression
Elevated temperature
Mechanical behavior
Recycled aggregate concrete-filled steel tubes (RACFST)
Recycled coarse aggregate (RCA)

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2017.04.118

Cite this

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title = "Mechanical behavior of recycled aggregate concrete-filled steel tube stub columns after exposure to elevated temperatures",

abstract = "The compressive mechanical behaviors of recycled aggregate concrete-filled steel tube (RACFST) stub columns after exposure to elevated temperatures were experimentally investigated in this study. The RACFST stub columns incorporating different recycled coarse aggregate (RCA) replacement ratios of 0, 50% and 100% were heated under elevated temperatures of 200 °C, 500 °C, and 700 °C. The results show that the compressive strength and elastic modulus of RACFST columns were relatively inferior to those of the corresponding natural aggregate concrete-filled steel tube (NACFST) columns after exposure to the same elevated temperatures, and the degradations became more pronounced with increasing RCA replacement ratio and higher temperature. This phenomenon might be attributed to the lower resistance of recycled aggregate concrete (RAC) than natural aggregate concrete (NAC) when was exposed to elevated temperatures. However, after elevated temperature exposure, the peak strain of RACFST stub column was relatively higher than that of the NACFST counterpart. Degradation regression formulas of mechanical properties and deformation behaviors of RACFST stub columns after exposure to elevated temperatures were proposed and agreed well with the experimental results.",

keywords = "Compression, Elevated temperature, Mechanical behavior, Recycled aggregate concrete-filled steel tubes (RACFST), Recycled coarse aggregate (RCA)",

author = "Wengui Li and Zhiyu Luo and Zhong Tao and Duan, {Wen Hui} and Shah, {Surendra P.}",

note = "Funding Information: The authors gratefully acknowledge the financial supports of the Australian Research Council Discovery Early Career Researcher Award (DE150101751) and Australian Research Council Research Hub for Nanoscience Based Construction Materials Manufacturing (IH150100006). The authors are also grateful for the financial supports of the National Natural Science Foundation of China (51408210) and University of Technology Sydney grants (Blue Sky Research Scheme and Early Career Researcher), Australia. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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doi = "10.1016/j.conbuildmat.2017.04.118",

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pages = "571--581",

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AU - Li, Wengui

AU - Luo, Zhiyu

AU - Tao, Zhong

AU - Duan, Wen Hui

AU - Shah, Surendra P.

N1 - Funding Information: The authors gratefully acknowledge the financial supports of the Australian Research Council Discovery Early Career Researcher Award (DE150101751) and Australian Research Council Research Hub for Nanoscience Based Construction Materials Manufacturing (IH150100006). The authors are also grateful for the financial supports of the National Natural Science Foundation of China (51408210) and University of Technology Sydney grants (Blue Sky Research Scheme and Early Career Researcher), Australia. Publisher Copyright: © 2017 Elsevier Ltd

PY - 2017/8/15

Y1 - 2017/8/15

N2 - The compressive mechanical behaviors of recycled aggregate concrete-filled steel tube (RACFST) stub columns after exposure to elevated temperatures were experimentally investigated in this study. The RACFST stub columns incorporating different recycled coarse aggregate (RCA) replacement ratios of 0, 50% and 100% were heated under elevated temperatures of 200 °C, 500 °C, and 700 °C. The results show that the compressive strength and elastic modulus of RACFST columns were relatively inferior to those of the corresponding natural aggregate concrete-filled steel tube (NACFST) columns after exposure to the same elevated temperatures, and the degradations became more pronounced with increasing RCA replacement ratio and higher temperature. This phenomenon might be attributed to the lower resistance of recycled aggregate concrete (RAC) than natural aggregate concrete (NAC) when was exposed to elevated temperatures. However, after elevated temperature exposure, the peak strain of RACFST stub column was relatively higher than that of the NACFST counterpart. Degradation regression formulas of mechanical properties and deformation behaviors of RACFST stub columns after exposure to elevated temperatures were proposed and agreed well with the experimental results.

AB - The compressive mechanical behaviors of recycled aggregate concrete-filled steel tube (RACFST) stub columns after exposure to elevated temperatures were experimentally investigated in this study. The RACFST stub columns incorporating different recycled coarse aggregate (RCA) replacement ratios of 0, 50% and 100% were heated under elevated temperatures of 200 °C, 500 °C, and 700 °C. The results show that the compressive strength and elastic modulus of RACFST columns were relatively inferior to those of the corresponding natural aggregate concrete-filled steel tube (NACFST) columns after exposure to the same elevated temperatures, and the degradations became more pronounced with increasing RCA replacement ratio and higher temperature. This phenomenon might be attributed to the lower resistance of recycled aggregate concrete (RAC) than natural aggregate concrete (NAC) when was exposed to elevated temperatures. However, after elevated temperature exposure, the peak strain of RACFST stub column was relatively higher than that of the NACFST counterpart. Degradation regression formulas of mechanical properties and deformation behaviors of RACFST stub columns after exposure to elevated temperatures were proposed and agreed well with the experimental results.

KW - Compression

KW - Elevated temperature

KW - Mechanical behavior

KW - Recycled aggregate concrete-filled steel tubes (RACFST)

KW - Recycled coarse aggregate (RCA)

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Mechanical behavior of recycled aggregate concrete-filled steel tube stub columns after exposure to elevated temperatures

Abstract

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Keywords

ASJC Scopus subject areas

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