United States Department of Transportation
i
Performance of Recycled Hot Mix Asphalt Mixtures
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1995-05-01
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[PDF-840.82 KB]
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Abstract:This research project was undertaken to evaluate the performance of recycled pavements in comparison to virgin (control) asphalt pavements. Five projects, each consisting of a recycled section and a control section, were subjected to detailed evaluation. In-situ mix properties (such as percent air voids, resilient modulus and indirect tensile strength), recovered asphalt binder properties (such as penetration, viscosity, G*/sino and G*sino), and laboratory recompacted mix properties (such as Gyrator Stability Index and confined dynamic creep modulus) were measured. A paired t-test statistical analysis indicated no significant differences between these properties of virgin and recycled mix pavements which have been in service from 1 1/2 to 2 1/4 years. Ten additional virgin mix pavements and 13 additional recycled pavements were also evaluated as two independent groups. No statistically significant differences were found between the recovered asphalt properties (penetration and viscosity) of these virgin and recycled pavements in service. The current Georgia Department of Transportation recycling specifications and mix design procedures appear to be satisfactory based on the results of this study.
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