High temperature behaviour of basalt fibre-steel tube reinforced concrete columns with recycled aggregates under monotonous and fatigue loading

JF Dong* (Lead Author), ZW Guan, Hwa Kian Chai, QY Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Experimental and numerical investigations were carried out to evaluate the effects of incorporating recycled coarse aggregates (RCA) on the mechanical behaviour of inner steel-tube reinforced concrete columns exposed to high temperature. The specimens were reinforced with basalt fibres (BF) and strengthened by carbon fibre reinforced polymer (CFRP) sheets, which were subjected to mechanical loading in monotonous and cyclic arrangement. Test results show that at room temperature (RT), incorporation of the chopped BF has decreased both the tensile strength and flexural strength of concrete specimens prepared with recycled aggregate concrete (RAC) but not their static elastic modulus. On the other hand, the BF has improved crack resistance of the steel tube reinforced RAC (STRC) column specimens. Also, the reduction in mass and dynamic elastic modulus of BF reinforced STRC specimens are lower than those of STRC at a given RCA replacement ratio and exposure temperature. Furthermore, improvements in mechanical performance under monotonous and fatigue loading was observed for STRC columns reinforced with BF and externally bonded CFRP sheets with high-temperature exposure (HTE). Therefore, it is possible that BF reinforced STRC columns could be used to reduce risk of brittle structural collapse when exposed to fire or elevated temperature.
Original languageEnglish
Article number131737
JournalConstruction and Building Materials
Volume389
Early online date15 May 2023
DOIs
Publication statusPublished - 31 Jul 2023

Keywords / Materials (for Non-textual outputs)

  • recycled aggregate concrete columns
  • basalt fibre
  • double-skin steel tube reinforcement
  • high temperature exposure
  • CFRP sheets reinforcement

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