United States Department of Transportation
i
Field evaluation of Wisconsin modified binder selection guidelines - phase II.
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2013-12-01
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[PDF-1.99 MB]
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Abstract:The purpose of this project was to continue phase I of the study with the objective of identifying promising procedures and applicable modified binder specification criteria for use in Wisconsin, based on comparison of test results to field performance. Field performance was assessed through condition surveys conducted between 2004 and 2012 as part of both phase I and phase II of the project.
The Linear Amplitude Sweep test, standardized under AASHTO TP101, was considered and evaluated as a potential test. The test related very well to field performance when performed at the required Superpave intermediate temperature grade of the project location, and the fatigue life parameter, Nf, was determined at the peak stress. A set of preliminary performance criteria were proposed based on the target mix design type and target traffic grade.
The Single Edged notched Bending procedure (BBR-SENB), based on the modification of the Bending Beam Rheometer test, currently under consideration by AASHTO for provisional standardization, was used to assess resistance to thermal cracking. The BBR-SENB results correlated well with the observed field thermal cracking when tests were conducted at the project location low temperature PG specification temperature. A specification and preliminary performance criteria is developed and suggested for use of the BBR-SENB as a binder selection and characterization test.
In terms of rutting resistance it was shown that the studied Wisconsin binders exceeded the most extreme binder rutting grade requirements according to AASHTO MP 19 (MSCR) at the local high performance temperatures. The binder test results were unable to accurately relate to the observed field conditions. It was shown that the aggregate structural properties could capture a trend that better reflected that of the field rutting behavior. Results indicate that proper ranking of material in terms of rutting resistance is not possible without consideration of both binder properties and aggregate structure, as both factors contribute significantly to the pavement rutting performance.
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