ABSTRACT
ABSTRACT: Although it is generally believed that road profile will improve after a repair paving project, it was revealed that this is not always true, judging from comparing IRI levels before and after repairing on 500 sections of the Japanese toll expressways. Some 30 percent having had IRI 2.0 m/km or lower showed higher IRIs after conventional milling and overlaying methods. To find out how to steadily obtain smoother road surface, octave band analysis was conducted to compare profile data before and after the repair between improved and unimproved sections.
