Experimental Study on Bond Durability Between CFRP Bars and Seawater Sea Sand Concrete in Seawater Environment
In order to study the influence factors of bond strength,bond failure mode and bond-slip curve between CFRP bars and seawater sea sand concrete in seawater environment,13 groups(39 in total)of CFRP bars-seawater sea sand concrete bond specimens were made for eccentric pull-out test.The effects of concrete strength grade,reinforcement type,corrosion environment and corrosion age on the bond performance between CFRP bars and seawater sea sand concrete were studied.The results show that the bond strength between CFRP bars and seawater and sea sand concrete increases obviously with the increase of concrete strength grade.In the seawater corrosion environment,CFRP bars have stronger corrosion resistance than ordinary steel bars,and their failure modes and bond-slip curves perform well.After long-term immersion in seawa-ter and dry-wet cycles,the bond strength of CFRP bars and seawater sand concrete showed a downward trend.With the increase of corrosion age,the bond strength between CFRP bars and seawater sea sand concrete decreases first and then increases,and the corrosion degree of dry-wet cycle specimens is more serious than that of long-term immersion specimens.
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