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Reduction in Roughness Due to Asphalt Concrete Overlays Placed on Flexible Pavements
Ride quality of a pavement is important to the travelling public, and highway agencies strive to provide a smooth road network. A common strategy that is used to improve the ride quality of flexible pavements is to place an asphalt concrete overlay. In some instances, the overlay is placed on the existing asphalt concrete surface, while in other instances, a portion of the existing asphalt concrete surface is milled before placing the overlay. The reduction in roughness in terms of the International Roughness Index due to single-lift overlays placed on flexible pavements is presented in this paper using data obtained from a highway agency. The analysis considered 780 and 1,120 segments that were 0.1-mile long on non-milled and milled projects, respectively. The average IRI values for 0.1-mile long segments that was achieved for a single lift overlay on non-milled and milled pavements was 62 and 54 in./mi., respectively. The 85th percentile IRI values for 0.1-mile long segments after an overlay for non-milled and milled pavements were 77 and 66 in./mi. The percent reduction in IRI that is achieved when placing an overlay was seen to increase with increasing values of before overlay IRI. A percent reduction in IRI of over 40 percent was observed for 0.1-mile long segments having an IRI before overlay greater than 100 in./mi.
Reduction in Roughness Due to Asphalt Concrete Overlays Placed on Flexible Pavements
Ride quality of a pavement is important to the travelling public, and highway agencies strive to provide a smooth road network. A common strategy that is used to improve the ride quality of flexible pavements is to place an asphalt concrete overlay. In some instances, the overlay is placed on the existing asphalt concrete surface, while in other instances, a portion of the existing asphalt concrete surface is milled before placing the overlay. The reduction in roughness in terms of the International Roughness Index due to single-lift overlays placed on flexible pavements is presented in this paper using data obtained from a highway agency. The analysis considered 780 and 1,120 segments that were 0.1-mile long on non-milled and milled projects, respectively. The average IRI values for 0.1-mile long segments that was achieved for a single lift overlay on non-milled and milled pavements was 62 and 54 in./mi., respectively. The 85th percentile IRI values for 0.1-mile long segments after an overlay for non-milled and milled pavements were 77 and 66 in./mi. The percent reduction in IRI that is achieved when placing an overlay was seen to increase with increasing values of before overlay IRI. A percent reduction in IRI of over 40 percent was observed for 0.1-mile long segments having an IRI before overlay greater than 100 in./mi.
Reduction in Roughness Due to Asphalt Concrete Overlays Placed on Flexible Pavements
Perera, Rohan W. (author)
International Airfield and Highway Pavements Conference 2019 ; 2019 ; Chicago, Illinois
Airfield and Highway Pavements 2019 ; 436-445
2019-07-18
Conference paper
Electronic Resource
English
Concrete overlays on asphalt pavements
| Engineering Index Backfile | 1966
| British Library Online Contents | 1992