DESIGN OF OVERLAYS FOR FLEXIBLE PAVEMENTS BASED ON AASHTO ROAD TEST DATA
The need for a suitable method of designing the thickness of overlays and predicting the performance of the overlaid pavement has recently been recognized. The AASHTO Road Tests included studies on 99 overlays, but they failed to produce conclusive results and hence provided no guidance for overlay designs. In the present investigation the raw data on the 99 overlays tested at the AASHTO Road Tests were evaluated. In the process, the raw data on the pavements that were overlaid also had to be evaluated. A relationship between pavement serviceability, 18-kip equivalents, and the thickness index of the pavements before the overlay was determined and was found to apply to the overlaid pavements. Based on this relationship, the strength Coefficient of the overlay was determined and a method of designing the thickness of an overlay was developed. This design method does not require the use of pavement deflection data by which the thickness of overlays are usually designed.
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- This report was sponsored by DOT, Federal Highway Administration and is supplementary to that entitled Design of Overlays Based on Pavement Condition, Roughness and Deflection, VHTRC 78-R24.
Virginia Highway and Transportation Research CouncilCharlottesville, VA United States
- Vaswani, N K
- Publication Date: 1978-2
- Pagination: 21 p.
- TRT Terms: Deflection; Flexible pavements; Overtopping; Pavement design; Pavements; Serviceability; Strength of materials
- Old TRIS Terms: Overfills; Pavement deflection
- Subject Areas: Design; Highways; Materials; Pavements;
- Accession Number: 00178785
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-RD-78-S0718, FCP 45D-514
- Contract Numbers: 1359
- Files: NTL, TRIS, USDOT, STATEDOT
- Created Date: Sep 14 1978 12:00AM