United States Department of Transportation
i
Layer Coefficients for New Hampshire Department of Transportation Pavement Design
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2019-06-01
[PDF-3.74 MB]
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Edition:Final Report
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Abstract:At present, New Hampshire Department of Transportation (NHDOT) has adopted AASHTO empirical pavement design approach. This research focused on updating the layer coefficients (a-value) of the asphalt mixtures using different mechanistic and performance based measures. A set of 18 commonly used mixtures in New Hampshire were selected for performance testing and evaluation of structural contribution in terms of layer coefficients. In order to develop the layer coefficients, comprehensive research was performed on the performance and properties of the mixtures through different mechanistic based laboratory testing methods. In addition, mixtures from the New England region were used to develop and validate three novel performance index parameters for rutting, fatigue and transverse cracking. The developed parameters were incorporated with the field distress data such as International Roughness Index (IRI) in order to develop mechanistically informed layer coefficients for New Hampshire flexible pavement design approach.
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