Computers and Concrete

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Compressive stress-strain behavior of RFAC after high temperature

  • Liang, Jiongfeng (Jiangsu Province Key Laboratory of Structure Engineering) ;
  • Wang, Liuhaoxiang (Faculty of Civil & Architecture Engineering, East China University of Technology) ;
  • Ling, Zhibin (Jiangsu Province Key Laboratory of Structure Engineering) ;
  • Li, Wei (Jiangsu Province Key Laboratory of Structure Engineering) ;
  • Yang, Wenrui (Faculty of Civil & Architecture Engineering, East China University of Technology)
  • Received : 2020.06.24
  • Accepted : 2022.06.07
  • Published : 2022.07.25
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Abstract

This paper discusses the effect of high temperatures (Ts) on the compressive strength and stress-strain curve of recycled fine aggregate concrete (RFAC), based on the experimental results. A total of 90 prisms (100 mm×100 mm×300 mm) were tested. The results show that the compressive strength and elastic modulus of RFAC specimens decreased significantly with increasing T values. As T increased, the strain corresponding to peak stress decreased first when T<200℃ and then increased afterwards. With increasing T values, the stress-strain curves became flat gradually, the peak stress dropped gradually, and εp decreased when T<200℃ and increased in the T range of 400-800℃. A stress-strain relations for RFAC exposed to high Ts is proposed, which agree quite well with the test results and may be used to practical applications.

Keywords

Acknowledgement

The authors are grateful to the financial support provided by the Chinese National Natural Science Foundation (No. 52068001), the Project of academic and technological leaders of major disciplines in Jiangxi Province (No. 20204BCJL2037), the Natural Science Foundation of Jiangxi Province (No. 20202ACBL214017), the Key R&D Program of Jiangxi Province (No. 20212BBG73002), the research fund of Jiangsu Province key laboratory of Structure Engineering (No. ZD1901) and the Opening Fund of State Key Laboratory of Green Building in Western China (No. LSKF202117).

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