1996 Volume 7 Issue 2 Pages 91-102
In general, it is expected that concrete structures using FRP rod as reinforcement could have high durability regardless of severity of service environment. However, for more reliable application is performed, there are some aspects that mast be resolved about long term behavior of FRP rod under high alkaline environment like as in concrete. In this study, 7 different kinds of FRP rod, which include 3 types of CFRP, 2 types of AFRP, a single type of GFRP and VFRP, are examined for durability in the high alkaline solution simulating the pore water of concrete under different prestress conditions and different exposing periods. Through this examination, it is concluded that there is a fair possibility of deterioration to occur by alkali attack not only on GFRP rod but also on the other kinds of FRP rod, such as CFRP and AFRP rods. Additionally, from the observation results by using SEM and EP-MA, main reasons of the deterioration on each FRP rod can be clarified.
