A study was initiated in 1981 by the wisconsin department of transportation to demonstrate and evaluate the performance of some innovative rehabilitation techniques on a section of i-90 between sth 30and ush 18. The existing pavement was a 20-year-old, four-lane, 9-in. Reinforced concrete pavement with dowelled contraction joints spaced at 80 ft. The average daily traffic in 1981 on this segment of highway was 36, 000, with 30% trucks. Eight different full-depth, full-lane-width, portland cement concrete (pcc) patching techniques weretried. Patch lengths were 4, 5, and 6 ft. 11% Of the total surface area of the existing pcc pavement was patched. After patching, the eastbound lanes were intermittently ground and westbound lanes were continuously ground. All transverse cracks and joints were filled with a silicone joint sealant. The longitudinal joints were filled witha rubberized asphalt sealant. Five years after the rehabilitation was completed, the condition of the various sections had deterioratedconsiderably. Pavement serviceability index values for the driving lane of the intermittently ground pavement dropped from 3.1 In 1981 to 1.6 In 1986. Ride quality of the continuously ground pavement dropped to 2.2. The friction quality of the pavement is at the minimum desirable for both the continuously ground and the intermittently ground pavement. Of the patching techniques studied, full-lane-width, full-depth patches with some means of load transfer performed the best. Skewing of joints helped greatly, reducing both the faulting andthe slab deflection. The precast patches and the 4-ft cast-in-placepatches faulted and deflected the most. This paper appears in transportation research record no. 1272, Pavement management and rehabilitation 1990.
Samenvatting