United States Department of Transportation
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Evaluation of the Long-Term Degradation and Strength Characteristics of In-situ Wisconsin Virgin Base Aggregates under HMA Pavements
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2018-11-01
[PDF-17.40 MB]
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Edition:Final Report, November 2015 – November 2018
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Abstract:This research investigated the performance of base layer aggregates in HMA pavements using laboratory tests on base layer materials and field tests on pavement sections. The purpose of this research was to investigate potential degradation of aggregate bases as well as to investigate strength reductions over time, and to evaluate the likely causes for both. Such information will be utilized for pavement design and performance evaluation using the AASHTOWare ME Pavement Design. Comprehensive field and laboratory testing programs were conducted to investigate base layer aggregates in which identified test sections at the selected pavement sites were subjected to testing using the FWD, GPR and DCP. Visual distress surveys were also conducted at the selected pavement sections. Base layer aggregate samples were collected from these pavement sites and subjected to a comprehensive laboratory testing program including: standard compaction, particle size analysis, Atterberg Limits, sodium sulfate soundness test, Micro Deval abrasion test, absorption, specific gravity, repeated load triaxial test – resilient modulus, and the CBR test. The base aggregates collected were crushed stone composed of mainly carbonates and gravel/crushed gravel materials. Comprehensive evaluation of test results was conducted with respect to base layer aggregate materials performance is well as performance within the pavement structure.
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