Comparison of Witczak NCHRP 1-40D &amp; Hirsh dynamic modulus models based on different binder characterization methods: a case study

Khattab, Ahmed; El-Badawy, Sherif M.; Elmwafi, Mahmoud; Hazmi, Al Abbas Al

doi:10.1051/matecconf/201712007003

Cited by 7 publications

(1 citation statement)

References 12 publications

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“…The Level 3 A and VTS binder regression constants were higher than those obtained for Level 2 binder inputs. This trend was also reported in previous studies, Esfandiarpour and Shalaby (2017a), and Khattab et al (2014Khattab et al ( , 2017…”

Section: Laboratory Measured Idt Strength Resultssupporting

confidence: 91%

Integrating Locally-Calibrated Material Characterization Models for Design of Flexible Pavements: A Case Study

Shalaby¹,

Kavanagh²

2018

International Conference on Transportation and Development 2018

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The Mechanistic Empirical Pavement Design Guide (MEPDG) method, currently known as Pavement ME, recommends using locally calibrated material characterization models developed from laboratory testing of local materials under specific environmental and traffic loading conditions. The Pavement ME design method offers a more realistic design procedure and reduces the uncertainty that arise from empirical design procedures. This thesis developed a locally calibrated indirect tensile (IDT) strength material model for low temperature cracking predictions of hot mix asphalt (HMA) in Manitoba, Canada. In addition, the research investigated the integration of locally calibrated HMA, and unbound granular material characterization models into the Pavement ME framework to improve the design of flexible pavements. Laboratory IDT testing was conducted on typical HMA mixtures containing extracted binders and varying percentages of reclaimed asphalt pavement (RAP). The laboratory measured IDT strengths were used to calibrate a local IDT strength predictive model for Manitoba. The predictions from the local Manitoba model were compared to the predictions from the global Pavement ME IDT model, and a Michigan calibrated IDT model, using a statistical analysis. It was found that the global Pavement ME IDT strength model, if used without local calibration, produced inaccurate predictions of the IDT strength for Manitoba mixtures. It was also found that binder characterization methods in Level 2 and Level 3 can significantly impact the accuracy of IDT strength predictions. A case study using developed local HMA, base, and subgrade material characterization models in Manitoba were compared to designs using default (Level 3) material input values in Pavement ME design software. vii 6.3.3.2 Locally Calibrated (Level 2

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Section: Laboratory Measured Idt Strength Resultssupporting

confidence: 91%