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Performance Monitoring of Olmsted CR 117 and 104 and Aggregate Base Material Update
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2023-12-01
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By Hoegh, Kyle
[PDF-4.80 MB]
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Edition:Final Report
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Abstract:A performance monitoring and forensic study was conducted on several test sections with varying base and pavement characteristics. This report includes the performance data from the current phase, which was extended until pavement reconstruction, with the previously reported data, collected since original construction of the test sections. Each of the three original test sections were prepared with a different combination of base type and asphalt binder type. Three different crushed limestone base types were used in the construction: (Section 1) standard Class 5, (Section 2) permeable aggregate base (PAB), and (Section 3) Class 5 modified. Two different types of asphalt binders, PG 58-28 and PG 58-34, were incorporated to evaluate the effects of cold temperature cracking. All asphalt mixtures were designed according to MnDOT Specification 2350. In addition to the comparisons among sections, each road section was constructed, both with and without transverse sawn-and-sealed regularly spaced joints, to evaluate the relative performance for ride and cracking (both spacing and crack severity) of sawing and sealing (S&S) versus allowing thermal cracking to relieve tensile stress without sawing and sealing (non-S&S). Prior to reconstruction, the severity of cracking in Section 1 was significantly higher than in Sections 2 and 3, with no severe cracking observed in Section 3. This study confirmed previous research efforts on this project, indicating that the combination of PG58-34 binder with Class 5 modified base material (Section 3) and PAB base (Section 2) performed well as compared to the control section. Seasonal trends of reduced stiffness during spring thaw followed by rapid recovery were also observed in the FWD analysis.
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