Abstract
This study reveals new findings on pavement smoothness improvement characteristics of HMA overlay on very rough concrete base slab surface that has not been previously investigated. International Roughness Index (IRI) measurements were conducted in an urban open-cut tunnel expressway. Overlay design is two HMA lifts of 4 cm-thick each. For concrete slab surface with 6.0 to 9.5 m/ km of IRI, less than 1.6 m/km of post-overlay IRI was achieved in all 30 sections with 100 m interval, and less than 1.0 m/km IRI was obtained in about 53% sections. For about 30% of the sections, 2.0 m/km IRI was accomplished even in the 1st lift overlay. In wide range of IRI including up to 9 m/km, it was concluded that smoother pre-overlay surface produces smoother post-overlay surface. Post-overlay IRI is about 20% of pre-overlay IRI, but with large variation. Rather, the relationship between ΔIRI and preoverlay IRI has higher statistical significance. By validation process, it was concluded that smoothness prediction with respect to ΔIRI is more reliable than IRI value itself. This characteristic was found to be more evident when roughness is evaluated with respect to detailed wavelengths.
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