Concrete Overlay for Concrete Pavement Rehabilitation

This research, focused on the applications of concrete overlay and a field test, was conducted to calibrate design method at 88 Highway 105 km, 2 lanes of 290 m. The field test consists of 6 cm and 10 cm bonded concrete overlay and 25 cm unbonded concrete overlay, using the slag cement for early traffic opening. These overlays were placed in 1 day. The whole period of traffic closing was 8 days and it was reopened to traffic after 3 days of curing time. 5 cracks were found when the field test section was investigated after 1 month, but all these cracks may not make significant problems to overlay because these initiated and groved at the same line of repair section. The rideability and skid resistance of overlay become as good as in the new pavement. The structural capacity against deflection was much increased, which were verified by FWD (Falling Weight Deflectometer). The field test section is being used in a good condition and the results of field application and pavement performance analysis are encouraging. This rehabilitation methods may be implemented in Korea after additional performance verifications.