United States Department of Transportation
i
Permanent deformation characteristics of Oregon mixes using the asphalt pavement analyzer : final report.
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2004-01-01
[PDF-1.33 MB]
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Alternative Title:Permanent deformation characteristics of Oregon mixes using the asphalt pavement analyzer.
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Abstract:The Asphalt Pavement Analyzer (APA) device was used to characterize the impacts of various mix factors on the development of permanent deformation dense-graded mixes. Factors investigated included: aggregate size of 12.5 and 19 mm (0.5 and 0.75 in), VMA (high, design, low), fines content (design and high), binder content (low, design, high) and binder type (PG 64-22, PG 70-22, PG 76-22). A single aggregate source was used for all mixes. A compactive effort of 100 gyrations was used for all test specimens and specimens were tested at 64°C (147.2°F) following standard APA test protocol.
The measured rut depth did not exceed the NCAT recommendation of 8 mm (0.312 in) for any of the mixes tested. An increase in the binder content increased the permanent deformation of the mixes prepared with the PG 64-22 binder, irrespective of the other mix parameters. These effects were not noted in the mixes prepared with PG 70-22 and PG 76-22 binders, perhaps due to the standard test temperature of 64°C (147.2°F). All mixes prepared with the higher temperature binders showed very low permanent deformation when tested at the standard 64°C (147.2°F) regardless of the value of the older mix parameters.
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