TY - JOUR
T1 - High temperature behaviour of basalt fibre-steel tube reinforced concrete columns with recycled aggregates under monotonous and fatigue loading
AU - Dong, JF
AU - Guan, ZW
AU - Chai, Hwa Kian
AU - Wang, QY
N1 - Funding Information:
The research was supported by the Open Fund of Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology (No. GF2022ZD001). The scholarship granted and financial support by Sichuan University are greatly appreciated. Special thanks to Mr. Shucheng Yuan, Mr Lang Li, Miss Min Hou, Miss Wei Liang and Mr. Pu Jia for their assistance in the laboratory work.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/7/31
Y1 - 2023/7/31
N2 - 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.
AB - 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.
KW - recycled aggregate concrete columns
KW - basalt fibre
KW - double-skin steel tube reinforcement
KW - high temperature exposure
KW - CFRP sheets reinforcement
U2 - 10.1016/j.conbuildmat.2023.131737
DO - 10.1016/j.conbuildmat.2023.131737
M3 - Article
SN - 0950-0618
VL - 389
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 131737
ER -