Laboratory evaluation of physical and mechanical properties of recycled asphalt pavement

Subhash C. Thakur, Jie Han, Wai Kiong Chong, Robert L. Parsons

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In many states, the use of RAP in surface, base, and sub-base courses is limited and large quantities of RAP aggregate remain unused. To explore the possibility of more or complete use of milled RAPs, it is necessary to study physical and mechanical properties of RAPs. In this study, RAPs from two sources were selected. Binder contents and properties of coarse and fine aggregates after removing asphalt binders were determined. RAPs were also tested for their maximum densities and California Bearing Ratios (CBRs). The influence of binder contents and aggregate properties on the physical and mechanical properties of RAPs was discussed. The binder content of RAPs was found to be higher than that in the original mix designs. The coarse aggregate angularity (CAA) of the RAPs was increased compared to that of the original mixes. The combined bulk specific gravities of aggregates from RAPs decreased slightly as compared with those in the original mixes. The percentage of fine particles in the RAPs was increased from that in the original mixes. The RAP with a higher binder content and a lower fine aggregate angularity had a higher optimum moisture content, a higher maximum dry density, and lower CBR values. The aggregates from the RAPs were not of uniform hardness based on the LA abrasion tests.

Original languageEnglish (US)
Title of host publicationPaving Materials and Pavement Analysis - Proceedings of the 2010 GeoShanghai International Conference
Pages255-263
Number of pages9
Edition203 GSP
DOIs
StatePublished - Sep 3 2010
Externally publishedYes
Event2010 GeoShanghai International Conference - Paving Materials and Pavement Analysis - Shanghai, China
Duration: Jun 3 2010Jun 5 2010

Publication series

NameGeotechnical Special Publication
Number203 GSP
ISSN (Print)0895-0563

Other

Other2010 GeoShanghai International Conference - Paving Materials and Pavement Analysis
CountryChina
CityShanghai
Period6/3/106/5/10

Keywords

  • Asphalt pavements
  • Laboratory tests
  • Mechanical properties
  • Recycling

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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