A Study of the Relationships Between Strength, Density, Permeability, and Gradations of Aggregate Bases

Report No: 78-R55

Published in 1978

About the report:

Accumulating evidence that inadequate subsurface drainage of some pavements was related to impervious base courses led to an investigation of the influence of low permeability fine materials on the physical characteristics of typical base courses. It was determined that a reduction in the minus 200 fraction of typical base courses from an average of 10% to an average of 7% was accompanied by a 1,000- to 10,000-fold increase in permeability with no adverse effects on California Beaming Ratio values or on maximum dry densities. These findings led to the development of a suggested revised gradation design range calling for from 6% to 8% minus 200 material as opposed to the old range of 8% to 12%.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


Other Authors

C. A. Persing, Kenneth H. McGhee, David C. Wyant

Last updated: January 27, 2024

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