A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
Highlights The Schapery viscoelastic model is implemented into the FE code to model the binders. Thermally induced stress (TIS) is used to specify the neat and modified asphalt binders. Time-temperature superposition of BBR test was not valid for neat and modified binders. 0.1wt% of sulfur improved thermal cracking resistance of polymer modified binder.
Abstract Through the strategic highway research program (SHRP) project, time-temperature superposition (TTS) was used to reduce the loading time of bending beam rheometer (BBR) test. Based on TTS, stiffness of the asphalt binder after a two-hour loading time is similar to that after 60s at 10°C above. This study attempted to evaluate the TTS validity using finite element (FE) method by developing master curves in a broad range of low temperatures. The results indicated that TTS was neither valid for modified asphalt binders nor for neat binder. Also, in addition to the loading time dependency of m-value, limiting values of stiffness and m-value find no rheological acceptance. As a remedy, thermally induced stress (TIS) due to cooling of asphalt binder was obtained from finite element method and employed to meet rheological needs. TIS indicates similar consequences with existing field data and previous studies related to gradation of different modified asphalt binders with almost similar content of modifiers.
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
Highlights The Schapery viscoelastic model is implemented into the FE code to model the binders. Thermally induced stress (TIS) is used to specify the neat and modified asphalt binders. Time-temperature superposition of BBR test was not valid for neat and modified binders. 0.1wt% of sulfur improved thermal cracking resistance of polymer modified binder.
Abstract Through the strategic highway research program (SHRP) project, time-temperature superposition (TTS) was used to reduce the loading time of bending beam rheometer (BBR) test. Based on TTS, stiffness of the asphalt binder after a two-hour loading time is similar to that after 60s at 10°C above. This study attempted to evaluate the TTS validity using finite element (FE) method by developing master curves in a broad range of low temperatures. The results indicated that TTS was neither valid for modified asphalt binders nor for neat binder. Also, in addition to the loading time dependency of m-value, limiting values of stiffness and m-value find no rheological acceptance. As a remedy, thermally induced stress (TIS) due to cooling of asphalt binder was obtained from finite element method and employed to meet rheological needs. TIS indicates similar consequences with existing field data and previous studies related to gradation of different modified asphalt binders with almost similar content of modifiers.
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
Jahanbakhsh, H. (author) / M. Karimi, Mohammad (author) / Moghadas Nejad, F. (author) / Jahangiri, Behnam (author)
Construction and Building Materials ; 128 ; 384-398
2016-10-13
15 pages
Article (Journal)
Electronic Resource
English
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
| British Library Online Contents | 2016
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
| Online Contents | 2016
Viscoelastic-based approach to evaluate low temperature performance of asphalt binders
| British Library Online Contents | 2016