Thermal Degradation of Antistripping Agents and Enhanced Performance by Curing
Publication: Journal of Materials in Civil Engineering
Volume 5, Issue 1
Abstract
The heat stability of antistripping (AS) additives held in hot asphalt cement is investigated by observing the changes in additive concentration and additive performance with holding time at 162.8°C. The effect of mix curing by hot storage 149°C on stripping resistance is also investigated. The diffusitivity of an additive in hot‐asphalt cement is measured to determine the rate of additive migration to the aggregate surface during curing. The concentrations of all commercial AS additives tested are observed to decrease significantly when heated in asphalt at 162.8°C, with a corresponding loss in effectiveness. It is also found that mixture curing by hot storage remarkably improved stripping resistance. This is believed to be due to improved adhesion of asphalt to the aggregate surface. Additive migration rate to the aggregate surface is shown to be higher than apparent curing rate. This implies that the enhanced stripping resistance observed with curing is not due to additive migration. Asphalt hardening occurring during mixture curing is shown to have only a second‐order effect on stripping resistance.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 5 • Issue 1 • February 1993
Pages: 1 - 18
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jul 25, 1989
Published online: Feb 1, 1993
Published in print: Feb 1993
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