A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Permanent Deformation Characteristics of Oregon Mixes Using the Asphalt Pavement Analyzer
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 degrees C (147.2 degrees 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 degrees C (147.2 degrees F). All mixes prepared with the higher temperature binders showed very low permanent deformation when tested at the standard 64 degrees C (147.2 degrees F) regardless of the value of the older mix parameters.
Permanent Deformation Characteristics of Oregon Mixes Using the Asphalt Pavement Analyzer
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 degrees C (147.2 degrees 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 degrees C (147.2 degrees F). All mixes prepared with the higher temperature binders showed very low permanent deformation when tested at the standard 64 degrees C (147.2 degrees F) regardless of the value of the older mix parameters.
Permanent Deformation Characteristics of Oregon Mixes Using the Asphalt Pavement Analyzer
J. R. Lundy (author) / J. A. Sandoval-Gil (author)
2004
116 pages
Report
No indication
English
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