TODAY'S TRAFFIC CALLS FOR HEAVY DUTY ASPHALT MIXES
This article notes how hot mix asphalt (HMA) overlays dominate the rehabilitation market and how these are being constantly reviewed, and mixtures and structural design updated. Significant improvements in mix characteristics have been achieved through increasing voids in mineral aggregate by moving the mix gradation away from the maximum density line, and increasing the design air voids from 2.5% to 4%. Experience on the New Jersey Turnpike, and standards for lane additions and improvements are discussed, as well as mixtures that do not densify under traffic and therby lose stability through the low voids and the lubrication effect of the excess asphalt cement. The design of high strength mixtures using various combinations of aggreagate sizes are discussed including the Splitmastixasphalt developed in Germany. Designed to whithstand studded tires and deformation under heavy traffic, the mix comprises a high stone content, high filler content, gap-graded surfacing mixture. The option of adding high proportion of large stone to the mix is discussed in some detail and includes 3 different types: uniformaly graded, stone filled, and open graded.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/11660022
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Corporate Authors:
Scranton Gillette Communications
380 E Northwest Highway, Suite 200
Des Planes, IL United States 60016-2282 -
Authors:
- ACOTT, M
- Publication Date: 1988-1
Media Info
- Features: Figures;
- Pagination: p. 39-45
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Serial:
- Roads & Bridges
- Volume: 26
- Issue Number: 1
- Publisher: Scranton Gillette Communications
- ISSN: 8750-9229
- Serial URL: http://www.roadsbridges.com/rb/
Subject/Index Terms
- TRT Terms: Asphalt cement; Asphalt mixtures; Heavy vehicles; Overlays (Pavements); Stone
- Subject Areas: Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 00467745
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 31 1988 12:00AM