Investigation of the Inter-Relationship between Base Pavement Stiffness and Asphalt Overlay Compaction.
Abstract
This report summarizes a research project to investigate the degree, if any, that base pavement support influences the compactibility of an asphaltic concrete overlay. As a secondary objective, the study enabled a comparison of the FAA Eastern Region in-place air voids compaction standard with the FAA National percentage Marshall density compaction standard. Field data were collected on three paving projects in FAA's Eastern Region. Nondestructive testing (NDT) was used to quantify the stiffness of base pavements prior to overlay. After overlay construction, the unit weights of the asphalt overlays were determined at the same locations where NDTs were performed, and in-place air voids and percent Marshall densities computed. Statistical techniques were employed to investigate correlations between stiffness and asphaltic concrete density (i.e., unit weight, in-place air voids, and percent Marshall density). Although a mild correlation between stiffness and density was found at one project, no general trends were detected for the other projects or from regression analyses performed on combined data bases. While this may suggest that base pavement stiffness is not a primary variable in affecting overlay compaction on airport pavements, the effect of stiffness may have been masked by other external variables, such as temperature, rolling, mix properties, quality control, etc. Finally, apparent inconsistencies were observed between FAA Eastern Region and FAA National density acceptance plans with regard to acceptable quality level and payment. Keywords: Bituminous pavements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1988
- Accession Number
- ADA194555
Entities
People
- Roy D. Mcqueen