Evaluation of the Engineering Characteristics of RAP/Aggregate Blends

https://doi.org/10.21949/15181892005PDFTech ReportFHWA/MT-05-008/8117-248117-24Bituminous aggregatesAsphalt pavementsRecyclingMontanaMontana. Dept. of Transportation. Research ProgramsMokwa, Robert LPeebles, Cole S.Montana State University--Bozeman. Civil Engineering Dept.Montana. Dept. of Transportation. Research ProgramsUnited States. Federal Highway Administration"This report describes results from a research program that was structured to evaluate the suitability of using reclaimed and recycled asphalt pavement (RAP) as an additive to crushed angular aggregate or pit run granular soils. Research and testing were conducted to evaluate the suitability of RAP blends in terms of significant changes observed in relatively easily measured and quantifiable properties. The laboratory testing program consisted of grain size analyses, specific gravity tests, modified Proctor compaction tests, relative density tests, Los Angeles abrasion tests, direct shear tests, permeability tests, R-value tests, and x-ray CT scans. Based on this study, it is concluded that the outlook for the continued implementation of RAP as an additive to granular base and subbase materials for use in highway construction looks promising. Results from the extensive suite of laboratory tests indicate that blending asphalt millings with granular cohesionless material like crushed aggregate or pit run cohesionless soil results in only minor changes to the engineering properties of the virgin material. This report describes the laboratory testing program and discusses the results in terms of the suitability of integrating recycled materials (RAP/aggregate blends) into asphalt pavement sections.The record also contains a summary and implementation report.88