Experimental Repair Methods for Continuously Reinforced Concrete Pavement

摘要

Two experimental procedures were used in an attempt to halt premature deterioration of continuously reinforced concrete pavement (CRCP). A cathodic protection system was installed in 1978 along a 1,000-foot section of CRCP. Anodes were buried at 50-foot intervals off the edge of the driving lane shoulder. In half of the project, anodes were placed in a trench which was back-filled with coke breeze. In the other half canister-type anodes were placed in postholes and surrounded with coke breeze. It appears that both methods are providing at least partial cathodic protection, and that the trench method is more efficient. A 4,350-foot-long section of CRCP was overlaid in 1978 with low slump dense concrete (LSDC). The pavement was scarified in varying depths ranging from 1/4-inch to 2 inches. Overlay thickness varied from 2 to 3 inches. A 1,000-foot section was sawcut at 15-foot intervals to provide jointed reinforced pavement. The repair and overlay have slowed the formation of new delaminations but active corrosion appears to be continuing. The repair work did not prevent the occurrence of new tension failures.