Abstract
The top face of a RC slab has been deteriorated and has been repaired and reinforced by overlaying the slab with SFRC. However, the SFRC has been debonded from the RC slab and the slab needs to be repaired again. To develop measures to prevent the debonding at the interface and improve the load-bearing performance of the overlay, the authors conducted a fatigue test under running wheel load to compare the fatigue resistance of the RC slab against others: the RC slab overlaid with the SFRC; the RC slab applied with an adhesive; and the RC slab applied with an adhesive and reinforced with CFRP grid. As a result, the equivalent number of running wheel load cycles to fatigue failure of the first, second and last was 10-28, 39-58 and 46-70 times greater than that of the RC slab test specimen, respectively, indicating that the fatigue resistance of the RC slab overlaid with the SFRC was greatly improved by the combined use of the adhesive and CFRP grid.
