PERFORMANCE OF BARE AND RESURFACED JRCP AND CRCP ON THE ILLINOIS INTERSTATE HIGHWAY SYSTEM -- 1991 UPDATE. INTERIM REPORT

Two previous studies on the survival of bare and asphalt-overlaid concrete pavements on the Illinois Interstate highway system were updated to reflect the performance of the pavements through 1991. The Illinois Interstate system consists of about 1750 miles of 10-in. jointed reinforced concrete pavement (JRCP) and continuously reinforced concrete pavement (CRCP) ranging in thickness from 7 to 10 in. As of 1991, about 60% of these pavements had been overlaid with asphalt concrete (AC), ranging in thickness from 1.5 to 6 in. Data for the survival analysis were retrieved from the Illinois Pavement Feedback System database. Both in-service life and accumulated 18-kip ESALS at rehabilitation were estimated for bare pavements categorized by type, thickness, and D cracking susceptibility, and for overlaid pavements categorized by overlay thickness, overlaid pavement type, and D cracking susceptibility. The results show the effects of D cracking, traffic level, pavement type, pavement thickness, and overlay thickness on performance of bare and resurfaced concrete pavements.