Abstract：In this paper, the effects of seawater immersion on the bond performance
between BFRP (Basalt Fiber Reinforced Polymer) bar and concrete were investigated.
The variations of ultimate bond strengths with immersion time at various
temperatures (25℃, 40℃ and 55℃) were tested. In combination with the theory of
accelerated corrosion, the degradation law of ultimate bond strength with service
year considering the influence of environment temperature and humidity was
predicted. In addition, the formula for the short-term bond strength between BFRP
bar and concrete was derived from the data of 97 BFRP bar bond tests collected from
literatures. With the bond damage factors for a design service life of 50 years
predicted in this study, the calculation formulas for the basic anchorage length of
BFRP bar with concrete at different environmental humidity categories were
obtained. Test results showed that the ultimate bond strength was reduced by 5.8%,
9.1% and 13.0% after being immersed in 25℃, 40℃ and 55℃ seawater for 60 days,
respectively. The predicted bond damage factors for indoor environment, normal
outdoor environment and humid ocean environment were 0.19, 0.32 and 0.51,
respectively, after servicing 50 years at the annual average temperature of the
South China Sea area. The proposed design method for the basic anchorage length of
BFRP bar is reasonable and could be adopted by relevant specifications.
