Is Low-Temperature Creep of Asphalt Mastic Independent of Filler Shape and Mineralogy?—Arguments from Multiscale Analysis
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 5
Abstract
This paper focuses on the effect of filler on the low-temperature creep of asphalt mastic. Based on experimental results obtained from bending-beam rheometer (BBR) experiments for both pure bitumen and mastic characterized by different filler types and content, a recently proposed multiscale model is employed for the prediction of low-temperature creep properties of the bitumen-filler composite. Accounting for the distinct matrix-inclusion morphology present at the so-called mastic-scale, the Mori–Tanaka scheme is employed for homogenization. This homogenization scheme is applied to the bitumen-filler composite, giving insight into the effect of filler on the low-temperature behavior of mastic. Hereby, the filler particles are considered as rigid inclusions with spherical shape, resulting in excellent agreement between the creep parameters of the homogenized material and the respective experimental BBR results. This agreement indicates that only the volume fraction of the filler, entering the Mori–Tanaka scheme, and neither the filler geometry nor the chemical composition of the filler influence low-temperature creep of asphalt mastic.
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Acknowledgments
The writers thank Babara Gagliano, Andreas Jäger, Karl Kappl, and Michael Wistuba from the Christian Doppler Laboratory for “Performance-based Optimization of Flexible Pavements” for fruitful discussions and helpful comments. The writers are indebted to Martin Hopfgartner, Thomas Riedmayer, Johann Schuch, and Roman Slany for the conduction of the bending-beam experiments. Financial support by the Christian Doppler Forschungsgesellschaft (Vienna, Austria) is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 5 • October 2005
Pages: 485 - 491
Copyright
© 2005 ASCE.
History
Received: Aug 10, 2004
Accepted: Oct 29, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
Notes
Note. Associate Editor: Mary Stroup-Gardiner
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