United States Department of Transportation
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Synthetic Aggregates for Asphalt Concrete Mixes
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1969-10-01
[PDF-2.06 MB]
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Abstract:Included in this report are the descriptions and findings resulting from laboratory and field investigations of the use of four manufactured aggregates for the production of asphaltic concrete. The information consists of basic design data for the inclusion of synthetic aggregates in asphaltic concrete mixes, the results obtained from a comprehensive program of laboratory testing of the synthetic aggregates and asphaltic concrete mixes containing the synthetic aggregates. Descriptions of field performance characteristics of asphaltic concrete mixes containing synthetic aggregates are also included. The laboratory test data were obtained from standard or well-established test procedures designed for the evaluation of the physical and engineering properties of the aggregates and asphaltic concrete mixes. The test data relating to the physical properties of synthetic aggregates reflect gradation, specific gravity, unit weight, abrasion, freeze-thaw and absorption of water, of the four synthetic aggregates included in the study. The laboratory test data relating to rational mix combinations reflect asphalt absorption by the aggregate, surface area, asphalt film thickness, air permeability, unconfined compressive strength, swell characteristic, Hveem stability, cohesiometer values, degradation of aggregates during compaction and surface abrasion.
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