Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
"In-service performance prediction of flexible pavements based on key material characteristics of asphalt";
Vortrag: 7th Slovenian Road and Transportation Congress,
- 22.10.2004; in: "Proceedings",
M. Vilhar (Hrg.);
Prediction of in-service performance of road pavements during their live time is one of the main objectives of pavement research these days. For flexible pavements the key performance characteristics are fatigue and low-temperature, as well as permanent deformation behavior at elevated temperatures. The problem facing pavement designers is the need to fully characterise the complex thermo-rheological properties of asphalt over a wide temperature range on the one hand, while on the other also providing a realistic simulation of the traffic- and climate-induced stresses to which pavements are exposed over their design lives of 20 to 30 years. Where heavily trafficked roads are concerned, there is therefore an urgent need for more com¨prehensive test methods combined with better numerical forecast procedures to improve the economics and extend the service lives of flexible pavements under repair and maintenance programs.
The scientific objectives and activities of the Christian Doppler Laboratory at the institute of road construction and maintenance at the Vienna University of Technology therefore focus on the development and standardisation of performance-based test methods for bituminous materials on the basis of effective mechanical characteristics. These test methods comprise low temperature tests, i.e. the tensile stress restrained specimen test or the uniaxial tensile strength test, stiffness and fatigue tests, i.e. the four point bending beam test of the uniaxial tension compression test, as well as methods to determine permanent deformation behavior by means of dynamic triaxial tests.
Further enhanced numerical pavement models are developed for a reliable prediction of in-service performance, which, in combination with performance-based tests, will enable a simulation of load-induced stresses and mechanogenic effects on the road structure and thus improved forecasts of the in-service performance of flexible pavements over their entire service lives.
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