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Meccanica
Published in: Meccanica 11/2014

01-11-2014 | MULTI-SCALE AND MULTI-PHYSICS MODELLING FOR COMPLEX MATERIALS

Creep response of bituminous mixtures—rheological model and microstructural interpretation

Authors: J. Füssl, R. Lackner, J. Eberhardsteiner

Published in: Meccanica | Issue 11/2014

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Abstract

The main failure mechanisms of flexible pavements, such as low-temperature cracking, fatigue failure, and rutting are strongly influenced by the viscoelastic properties of asphalt. These viscoelastic properties originate from the thermorheological behavior of bitumen, the binder material of asphalt. In this paper, the bitumen behavior is studied by means of a comprehensive experimental program, allowing the identification of viscoelastic parameters of a power-law type creep model, indicating two time scales (short-term and long-term) within the creep deformation history of bitumen. Moreover, these characteristics of the creep deformation transfer towards bitumen-inclusion mixtures, as illustrated for mastic, consisting of bitumen and filler. For this purpose, the aforementioned power-law creep model is implemented into a micromechanical framework. Finally, the activation of the different creep mechanisms as a function of the loading rate is discussed, using viscoelastic properties obtained from both static and cyclic creep tests.
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Footnotes
1
The error R between the experimental result J exp (t) and the model response J(t) is defined by R(J a ,n)=e(J a ,n)/u, with
$$\begin{aligned} &{e^2(J_a,n) = \sum_{i=1}^{r} \bigl[ J_{exp}(t_i) - J(J_a,n,t_i) \bigr]^2 \quad\mbox{and} }\\ &{ u^2 = \sum _{i=1}^{r} J_{exp}^2(t_i),} \end{aligned}$$
(5)
where r is the number of considered data points. The error R is minimized by adapting J a and n, using a simplex iteration [12].
 
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Metadata
Title
Creep response of bituminous mixtures—rheological model and microstructural interpretation
Authors
J. Füssl
R. Lackner
J. Eberhardsteiner
Publication date
01-11-2014
Publisher
Springer Netherlands
Published in
Meccanica / Issue 11/2014
Print ISSN: 0025-6455
Electronic ISSN: 1572-9648
DOI
https://doi.org/10.1007/s11012-013-9775-y

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