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Edition:Final report.May 1988April 1989.
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Abstract:The addition of a rubber-tire roller was required on two projects on maintenance schedules and on two construction projects in 1988. The rubber-tire roller was used as an addition to the conventional rollers on one-half of each project. The rubber-tire roller was required to have a minimum of 80 psi ground contact pressure (GCP). Used in the intermediate roller position, it applied three passes to the pavement. On one of the two projects, the addition of the rubber-tire improved pavement properties compared to those on the conventionally rolled section. On one project, the conventionally rolled section had better pavement properties, and on one project there was no differences. The results of this study an done conducted in 1987 indicate that the addition of a rubber-tire roller improved the pavement properties on more than half of the projects tested. Based on this rate of improvement, it is recommended that a rubber-tire roller operating in the intermediate roller position with a minimum GCP of 80 psi and applying three passes be required on all modified mixes; i.e., those in which the optimum asphalt content is based on a 75-blow Marshall compactive effort.
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