Abstract
To apply the high strength fibers in woven sheet shape to sewerage concrete structures for repair and strengthening, their long term durability in acid environment should be made clear as well as their load carrying behaviors. This paper describes the acid resistance of several kinds of fiber sheets, resins and FRP plates of their combination. Flexural strengthening of concrete prisms using the fiber sheets and the strengthening durability in acid solution were also discussed. Finally, the external loading test of hume pipes strengthened with the fiber sheets was conducted. The results indicate that appropriate combination of fiber sheet and resin can be adopted as one of the repair and strengthening methods for sewerage concrete structures.
