Lessons Learned from RAP Sections with 17 Years of Service

Maintenance and rehabilitation (MR (2) in terms of resisting reflective cracking 1 unit thick of 35 % RAP is equivalent to 0.26 unit thick virgin mixture; (3) with the 40 % reflective cracking rate criterion, the life for virgin AC with a 125 mm overlay is 65 % longer than that for a 50 mm overlay; (4) in terms of pavement performance, no significant difference exists between 50 mm milling and non-milling if the milling does not remove existing cracks completely; (5) the maximum rut depth of 12.7 mm among the test sections indicates that the mixture is rut-resistant, and the existing pavement with lime-treated base and subbase beneath the overlay provides sound foundation; and (6) the overlay tester can be a viable and simple measure to evaluate the asphalt mixtures’ reflective cracking resistance.