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Reliability of Calculation of Dynamic Modulus for Asphalt Mixtures Using Different Master Curve Models and Shift
Hao Chen1, Diego Maria Barbieri1,2, Xuemei Zhang1
1Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Høgskoleringen 7A, 7491 Trondheim, Norway.
Materials (Basel, Switzerland)
|June 24, 2022
Summary
This study assessed models and shifting techniques for asphalt dynamic modulus master curves in Norway. The standard logistic sigmoidal model with the Williams-Landel-Ferry equation provided the best fit for neat bitumen asphalt concrete and stone mastic asphalt.
Area of Science:
- Pavement Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Developing a robust mechanistic-empirical pavement design system is crucial for Norwegian conditions.
- Accurate determination of asphalt mixture dynamic modulus master curves is essential for pavement performance prediction.
- Understanding the influence of different models and shifting techniques is key to optimizing this process.
Purpose of the Study:
- To evaluate various models and shifting techniques for constructing dynamic modulus master curves of asphalt mixtures.
- To identify the most suitable methods for Norwegian asphalt types (AC and SMA) with neat and polymer-modified bitumen.
- To provide recommendations for a mechanistic-empirical pavement design system tailored to Norway.
Main Methods:
- Prepared Asphalt Concrete (AC) and Stone Mastic Asphalt (SMA) specimens with neat and polymer-modified bitumen using a roller compactor.
- Determined dynamic moduli via cyclic indirect tensile testing.
- Constructed dynamic modulus master curves using standard logistic sigmoidal, generalized logistic sigmoidal, and Christensen-Anderson-Marasteanu models, applying log-linear, quadratic, Arrhenius, Williams-Landel-Ferry, and Kaelble shifting techniques.
Main Results:
- The standard logistic sigmoidal model combined with the Williams-Landel-Ferry shifting equation demonstrated the most suitable fit for the tested asphalt specimens.
- Asphalt mixtures containing neat bitumen exhibited a better fit compared to those with polymer-modified bitumen.
- The Kaelble and log-linear shifting equations yielded comparable results.
Conclusions:
- The standard logistic sigmoidal model and Williams-Landel-Ferry equation are recommended for dynamic modulus master curve construction in Norway.
- Neat bitumen mixtures offer a more predictable response than polymer-modified ones for master curve fitting.
- Findings support the refinement of mechanistic-empirical pavement design systems for Norwegian climatic and traffic conditions.
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