Abstract
This paper reports the performance of repair method with carbon fiber sheets for prestressed concrete beams, which were members of highway bridges, damaged by alkali aggregate reaction. Test cores were taken both parallel (horizontally) and perpendicular (vertically) to the direction of prestressing. Compressive strength and Young's modulus of the vertical cores were smaller than that of the horizontal cores. It was clarified that microstructure of horizontal cores were denser than vertical cores, because the prestressing prevented the expansion of horizontal concrete. The cores were effectively restraind with carbon fiber sheets in the expansion. The carbon fiber sheets can be expected to restrain the expansion of concrete damaged by alkali aggregate reaction because of water resistability and confinement.
