A Case Study of the Design, Installation and Early Performance of a Nineteen-millimeter Superpave mix

Report No: 00-R2

Published in 1999

About the report:

An attempt was made to design and construct a coarse matrix high binder (CMHB) mix. When the design of the CMHB mix was unsuccessful a coarse 19.0-mm Superpave mix was substituted. This report describes the attempted design of the CMHB mix, as well as the design, construction, and early performance of the Superpave mix. Construction problems with the Superpave mix included low gyratory voids on field samples and tenderness during compaction. Mix adjustments in the gradation and asphalt content failed to remedy the problems. The tenderness also contributed to inadequate pavement density. Although field samples indicated low gyratory voids, no overconsolidation as would be evidenced by bleeding has been observed. Therefore, it appears that this mix was able to contain more asphalt than was predicted by the gyratory voids. The average rut depth of all sections was about 4 mm after 27 months.

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.

Authors

Other Authors

G. W. Maupin, Jr., P.E.

Last updated: December 11, 2023

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