A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Restricted Zone in the Superpave Aggregate Gradation Specification
The aggregate specification for Superpave (trademark) hot-mix asphalt (HMA) mixtures includes a restricted zone that lies along the maximum density gradation between the intermediate size (i.e., either 4.75 or 2.36 mm, depending on the nominal maximum size of the aggregate) and the 0.3-mm size. The restricted zone forms a band through which gradations were recommended not to pass. The restricted zone requirement was adopted in Superpave to reduce the incidence of tender or rut-prone HMA mixes. Although the restricted zone was included in Superpave as a recommended guideline and not as a required specification, some highway agencies interpret it as a requirement. This research project was undertaken to evaluate the effect of the Superpave restricted zone on permanent deformation of dense-graded HMA mixtures on the basis of a statistically planned and properly controlled laboratory experiment. The project's primary objective was to determine under what conditions, if any, compliance with the restricted zone requirement is necessary when HMA meets all other Superpave requirements such as fine aggregate angularity (FAA) and volumetric mix criteria for the specific project.
Restricted Zone in the Superpave Aggregate Gradation Specification
The aggregate specification for Superpave (trademark) hot-mix asphalt (HMA) mixtures includes a restricted zone that lies along the maximum density gradation between the intermediate size (i.e., either 4.75 or 2.36 mm, depending on the nominal maximum size of the aggregate) and the 0.3-mm size. The restricted zone forms a band through which gradations were recommended not to pass. The restricted zone requirement was adopted in Superpave to reduce the incidence of tender or rut-prone HMA mixes. Although the restricted zone was included in Superpave as a recommended guideline and not as a required specification, some highway agencies interpret it as a requirement. This research project was undertaken to evaluate the effect of the Superpave restricted zone on permanent deformation of dense-graded HMA mixtures on the basis of a statistically planned and properly controlled laboratory experiment. The project's primary objective was to determine under what conditions, if any, compliance with the restricted zone requirement is necessary when HMA meets all other Superpave requirements such as fine aggregate angularity (FAA) and volumetric mix criteria for the specific project.
Restricted Zone in the Superpave Aggregate Gradation Specification
P. S. Kandhal (author) / L. A. Cooley (author)
2001
88 pages
Report
No indication
English
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