Talks and Poster Presentations (without Proceedings-Entry):
D. Maschauer, B. Hofko, D. Steiner:
"VAPro - long-term ageing of HMA based on highly oxidant gases";
Talk: 7th International Conference on Bituminous Mixtures and Pavements,
Thessaloniki, Griechenland (invited);
2019-06-12
- 2019-06-14.
English abstract:
This paper presents a recently developed conditioning method for long-term ageing of compacted HMA spec-imens in the lab. The Viennese Ageing Procedure (VAPro) works at temperatures and pressures that occur in the field on pavement surfaces regularly. To increase the oxidation reaction, highly oxidant gases (ozone and nitric oxides) are led through the specimen. It is expected that the chemical reactions triggered by VAPro are similar to field ageing. The presented study shows the applicability on paving grade and SBS-modified bitu-mens from different sources. Binders were extracted after VAPro-ageing and tested in DSR. Bitumen sam-ples from different sources show significantly different ageing susceptibility. The increase in |G*| varies from 3 for the least ageing susceptible bitumen to 13 for the samples with highest ageing rate. Significant differ-ences between PAV aged bitumen and bitumen from VAPro-aged samples were found. VAPro can discrimi-nate binders with different ageing susceptibility more sensitively than PAV.
Keywords:
bitumen, ageing, oxidation, VAPro, DSR, RTFOT, PAV
Electronic version of the publication:
https://publik.tuwien.ac.at/files/publik_283404.pdf
Created from the Publication Database of the Vienna University of Technology.