Literature Review of Durability of Composites in Reinforced Concrete

摘要

Many fiber reinforced plastics (FRP's) have excellent corrosion resistanceproperties and can be engineered to have mechanical properties comparable to steel. These characteristics have promoted their use in many structural applications all over the world. Although the short-term mechanical properties of these materials are usually well documented, long-term durability issues still remain. Some of these issues are hereby summarized, mostly for the case of reinforced concrete applications. Experimental observations indicate that all fiber reinforced plastics have long term strengths which are only a fraction of the short term strength. For glass, aramid and carbon FRP's, the fraction is about 30%, 50% and 80%, respectively. In addition glass and aramid FRP's will degrade if in direct contact with concrete, in the presence of moisture, and when subjected to UV radiation. These poor durability characteristics place significant restrictions on the working stress allowables for design.