Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):
M. Spiegl, R. Lackner, M. Wistuba, R. Blab:
"Evaluation of Temperature Associated Cracking in Asphalt Mixtures by Means of Performance-Based Laboratory Testing";
Vortrag: 7th International Conference on the Bearing Capacity of Roads, Railways and Airfields - BCRA05,
Trondheim - Norwegen;
- 29.06.2005; in: "Seventh International Conference on the Bearing Capacity of Roads, Railways and Airfields",
ABSTRACT: In this paper, new test methods for identification of low-temperature failure of asphalt are proposed. Low-temperature failure occurs when the stresses induced by restrained thermal shrinkage during cooling periods exceeds the tensile strength at the respective
temperature. In order to specify test methods describing both (i) these in-service conditions of flexible pavements and (ii) the underlying thermorheological behavior of asphalt, the four tests characterized by different thermal and mechanical loading are required:
1. The Tensile-Stress-Restrained-Specimen Test (TSRST) is used to simulate the inservice conditions of asphalt by restraining the deformation, while the temperature is reduced by a pre-specified cooling rate;
2. The Uniaxial-Tensile-Strength Test (UTST) provides insight into the material resistance (tensile strength) at selected temperatures;
3. The Thermal-Shrinkage Test (TST) is used to specify the loading during cooling by determining the thermal shrinkage coefficient as a function of temperature; and, finally,
4. Creep/Relaxation Tests (CTs/RTs) for identification of the viscoelastic behavior of asphalt at different temperatures.
In fact, the combination of all four tests is required to fully characterize the low-temperature behavior of asphalt when subjected to thermal and mechanical (tensile) loading. Based on the obtained experimental results, key material parameters for ranking asphalts with regard to their low-temperature performance are critically reviewed. Moreover, the different test results provide important insight for the development of material models for analysis-based
prediction tools and enable the formulation of optimization parameters of low temperature characteristics for mix design.
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