Pilot Study to Determine Compaction Level of Plant Mix Overlays: Final Report

Report No: 77-R49

Published in 1977

About the report:

Because some of the Department's bituminous overlays have displayed cracking in the short period of three to five years, and because few if any density controls are exercised in maintenance plant mix schedules, the Bituminous Research Advisory Committee recommended that the Research Council undertake a study to determine the compaction level generally being attained on maintenance overlays. Data taken over the 1975-76 paving seasons, indicate that the Department's specification requirement is not being met consistently. For example, in 1976 only 16% of the maintenance projects tested met the specification. Because of these poor density results, it is recommended that nuclear control strips be used on maintenance overlays as they are on new construction.

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

Charles S. Hughes, P.E.

Last updated: January 28, 2024

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