Get a grip
Roads & Bridges
June 2005
Allen Zeyher Managing Editor
Asphalt pavement designers usually have to choose between strength and durability. Racetracks lean toward strength, but that usually costs them in durability.
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The old with the New
Roads & Bridges
May 2005
Jo Sias Daniel
The purpose of this study was to examine the effect of RAP on the volumetric properties and stiffness of HMA.
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Central's command
Roads & Bridges
February 2005
Brian D. Prowell, P.E., and Graham C. Hurley, Contributing Authors
“It is our goal to achieve a minimum of 90% of the total achievable incentive.”
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Do they all agree?
Roads & Bridges
July 2003
Tom Harman, Contributing Author
As a part of the Superpave mix design system, gyratory compactors are important in defining the mix characteristics to be achieved in production. There are currently eight approved models of gyratory compactors. It is important that these devices provide consistent results from one to another, because results from contractors' mix designs are used to provide construction control and are subject to agency verification. A lack of consistency can result in substantial and needless penalties and a mutual distrust between contractors, testing firms and agencies.
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Eyeing the surface
Roads & Bridges
April 2003
Segregation may be defined as lack of homogeneity of constituents in hot-mix asphalt (HMA) pavements such that accelerated pavement distresses occur. The most common form of HMA segregation has been identified as gradation segregation. Gradation segregation is the non-uniform distribution of coarse and fine aggregate materials in the finished HMA pavements. The work described here was specifically focused on the use of laser technology to develop procedures or screening tools to determine segregated areas.
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