TY - JOUR
T1 - Bond durability of steel-FRP composite bars embedded in seawater sea-sand concrete under constant bending and shearing stress
AU - Dong, Zhiqiang
AU - Wu, Gang
AU - Zhao, Xiao Ling
AU - Zhu, Hong
AU - Lian, Jinlong
N1 - Funding Information:
The authors would like to acknowledge financial support from the National Natural Science Foundation of China (Grant No: 51525801 ), the National Key Research and Development Program of China ( 2016YFC0701400 ), the Australian Research Council ( ARC ) through an ARC Discovery Grant ( DP160100739 ) and the National Natural Science Foundation of China (Grant No: 51478106 ).
Funding Information:
The authors would like to acknowledge financial support from the National Natural Science Foundation of China (Grant No: 51525801), the National Key Research and Development Program of China (2016YFC0701400), the Australian Research Council (ARC) through an ARC Discovery Grant (DP160100739) and the National Natural Science Foundation of China (Grant No: 51478106).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/12/20
Y1 - 2018/12/20
N2 - The combination of the new steel-FRP composite bar (SFCB) and natural seawater and sea-sand concrete (SWSSC) has good prospects to be applied in development along the ocean coast and offshore islands. However, at present, there is still a lack of clear understanding on the durability of this new combination under actual marine service conditions. Therefore, in this paper, the interfacial bond durability, which is critical to the overall durability of SFCB reinforced SWSSC structures, was evaluated by accelerated aging tests. A new type of eccentric pullout test was designed to take into account the bending and shearing stress states of the concrete. The experimental results showed that the bond strength of SFCBs decreased by 5% after 9 months of aging in a 40 °C seawater wet-dry cycling environment and decreased by 26.2% after 9 months of aging in a 50 °C seawater immersion environment. Due to the surface degradation of the basalt fiber reinforced polymer (BFRP) after exposure, the sheared failure layer gradually transferred from the interface to the inner layer. Based on Fib Bulletin 40, the predicted bond strength retentions of SFCBs with SWSSC were 84% to 96% after 50 years of service.
AB - The combination of the new steel-FRP composite bar (SFCB) and natural seawater and sea-sand concrete (SWSSC) has good prospects to be applied in development along the ocean coast and offshore islands. However, at present, there is still a lack of clear understanding on the durability of this new combination under actual marine service conditions. Therefore, in this paper, the interfacial bond durability, which is critical to the overall durability of SFCB reinforced SWSSC structures, was evaluated by accelerated aging tests. A new type of eccentric pullout test was designed to take into account the bending and shearing stress states of the concrete. The experimental results showed that the bond strength of SFCBs decreased by 5% after 9 months of aging in a 40 °C seawater wet-dry cycling environment and decreased by 26.2% after 9 months of aging in a 50 °C seawater immersion environment. Due to the surface degradation of the basalt fiber reinforced polymer (BFRP) after exposure, the sheared failure layer gradually transferred from the interface to the inner layer. Based on Fib Bulletin 40, the predicted bond strength retentions of SFCBs with SWSSC were 84% to 96% after 50 years of service.
KW - Basalt fiber
KW - Bond durability
KW - Coupled bending and shearing stress
KW - Pullout
KW - Seawater sea-sand concrete (SWSSC)
KW - Steel-FRP composite bars (SFCBs)
UR - http://www.scopus.com/inward/record.url?scp=85055560832&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2018.10.154
DO - 10.1016/j.conbuildmat.2018.10.154
M3 - Journal article
AN - SCOPUS:85055560832
SN - 0950-0618
VL - 192
SP - 808
EP - 817
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -
