EXAMINATION OF FACTORS RELATED TO THE DEVELOPMENT AND PERFORMANCE OF OPEN-GRADED ASPHALT FRICTION COURSE
Studies which investigated the influence of permeability on asphalt concrete durability are reported. A 1969 study planned to produce a number of population groups of asphalt concrete mixtures each with a different level of permeability and porosity and to measure the time-rate of asphalt hardening in these mixtures. Details of the long-term durability study and the accelerated study are outlined and the results are tabulated. A comparison of hardening rates was made between mixtures used in the 2 studies. It was found that the asphalt hardening rate was less at lower temperatures and that at an accessible void content of about 1 percent of less, hardening rates would be slowed, but that at accessible void contents of about 0.5 percent or less, hardening rates would be almost totally inhibited. It was concluded that air void content or permeability has no influence on asphalt cement hardening in asphalt mixtures except that there is a level of acessibility above which hardening will occur uninhibited and below which hardening will essentially cease. The results are also discussed of a skid resistance evaluation study. The use and benefits of open-graded plant mix seal mixtures are outlined, and comments are made on asphalt content determination interstitial void capacity, optimum tine aggregate content, and optimum mixing temperature. Resistance to effects of water, the effects of pavement and mixture design, and hydrologic considerations are also discussed.
- Proceedings of International Symposium on Porous Asphalt, Amsterdam, Netherlands, May 31 to June 2, 1976.
Study Centre for Road Construction, Netherlands14a Jansbuitensingel
- Smith, R W
- Publication Date: 1977
- Features: Figures; References; Tables;
- Pagination: p. 91-135
- TRT Terms: Accelerated tests; Air voids; Asphalt; Asphalt concrete; Concrete hardening; Durability; Fine aggregates; Friction; Hardness; Hydrology; Mix design; Open graded aggregates; Pavement performance; Pavements; Permeability; Skid resistance; Surface course (Pavements); Texture
- Old TRIS Terms: Air voids content
- Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; Materials; Pavements;
- Accession Number: 00163670
- Record Type: Publication
- Report/Paper Numbers: S.C.W. Record 2 Proceeding
- Files: TRIS
- Created Date: Mar 14 1978 12:00AM