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Evaluation of the 1–37A Design Process for New and Rehabilitated JPCP and HMA Pavements
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2008-10-01
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[PDF-2.92 MB]
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TRIS Online Accession Number:01173812
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Edition:Final Report
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Abstract:Recognizing the limitations of the 1993 AASHTO design guide and the need for improvement in the pavement design process, the NCHRP project 1-37A was initiated to develop a pavement design guide for new and rehabilitated pavements based on mechanistic-empirical (M-E) approaches. Therefore, a need to evaluate the M-E PDG was realized in Michigan. This report highlights the evaluation of the current performance models for jointed plain concrete (JPC) and hot mix asphalt (HMA) concrete pavements for the state of Michigan. The results showed that effect of PCC slab thickness and edge support on performance were significant among design variables while CTE, MOR, base type and subgrade played an important role among material-related properties. Slab thickness interacts significantly with material properties—CTE and MOR, for cracking in JPCP. A lower MOR and a higher CTE combination is drastic for JPCP cracking. For faulting, the material properties—CTE and MOR interact significantly with site factors—subgrade soil type and climate. For roughness, the interactions — slab thickness by CTE and climate by subgrade soil types, play a significant role. The results for HMA pavements showed that eleven design and material variables were significant in affecting performance. These include AC layer thickness, AC mix characteristics, base, subbase and subgrade moduli, and base and subbase thickness. Binder grade was found to be the most critical parameter affecting transverse cracking. Significant interactions were found among several of the variables in affecting all the performance measures.
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