United States Department of Transportation
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Field verification of KDOT's Superpave mixture properties to be used as inputs in the NCHRP mechanistic-empirical pavement design guide.
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2009-01-01
[PDF-1.81 MB]
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TRIS Online Accession Number:01124901
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OCLC Number:316329190
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:In the Mechanistic–Empirical Pavement Design Guide (M-EPDG), prediction of flexible pavement response and performance needs an input of dynamic modulus of hot-mix asphalt (HMA) at all three levels of hierarchical inputs. This study was intended to verify that this input modulus could be achieved in the field construction. Five newly built Superpave pavements for calibration of M-EPDG by the Kansas Department of Transportation and four Superpave pavement test sections on the Kansas perpetual pavement project on US-75 were selected as test sections in this study. Deflection data on all test sections were collected with a Dynatest 8000 Falling Weight Deflectometer. Normalized deflection data for all calibration sites and US-75 sections were used to back-calculate asphalt layer moduli using three backcalculation computer programs, EVERCALC, MODCOMP II and MODULUS. Laboratory dynamic modulus tests were conducted on asphalt concrete (AC) cores from five calibration sites and on laboratory-compacted samples from the US-75 perpetual pavement sections. Dynamic modulus was also predicted with the Witczak equation, new Witczak model and Hirsch model. The results show that the surface deflection was highly affected by the test temperature for calibration sites whereas test temperature and pavement thickness highly affected surface deflections for perpetual pavement sections. Repeating different target loads reduces nonlinearity significantly. Laboratory dynamic modulus on US marked highways is higher than on Kansas marked highways for the calibration sites.
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