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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.


Evaluation of Asphalt Additives to Resist Permanent Pavement Deformation
G. W. Maupin, Jr.
Year: 1989
VTRC No.: 90-R5
Abstract: Many new asphalt additives reportedly improve the stability and flexibility of asphalt concrete, which leads to increased service life. Four polymers (Polybilt 100, Styrelf 13, Downright HM 100L, and Ultrapave 70) and a diatomaceous filler (Celite 292) were incorporated into mixes placed in test sections for a field evaluation and compared to a control section containing hydrated lime. Rut depth, pavement distress, stiffness, and strength were used to evaluate the mixtures. The mixtures containing Polybilt 100, Downright HM 100L, and Ultrapave 70 produced higher values of strength and stiffness than the mixtures containing Styrelf 13 and Celite 292. After 31 months, all sections including the control section are performing well with the maximum rutting less than 0.15 in. There was no appreciable difference between control and additive sections.