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D. Maschauer, D. Steiner, J. Mirwald, B. Hofko, H. Grothe:
"Viennese Aging Procedure - Behavior of various bitumen provenances";
Talk: RILEM 252 - CMB Symposium, Braunschweig (invited); 2018-09-17 - 2018-09-18.

Bitumen changes its properties in the course of time under natural and anthropogenic influences due to its organic origin. These processes are commonly called "aging". The material becomes stiffer and more brittle, resulting in less fa-vorable low temperature and fatigue behavior. For this reason, it is important to simulate the aging of the material in the laboratory in an accelerated way to study the change in material behavior and minimize damage on the road. On the bitumen level, the standardized methods RTFOT (Rolling Thin Film Oven Test) and PAV (Pressure Aging Vessel) are used. Various methods have been developed in the past to simulate aging of asphalt mixes or compacted specimens. The study pre-sented in this paper evaluated the aging method "Viennese Aging Procedure" (VAPro) for applicability with the aid of a parameter study with bitumen of differ-ent origin. VAPro uses realistic boundary conditions (temperature: +60°C, pres-sure: ~ 0.3 bar) and increases the rate of aging of the compacted asphalt mix spec-imen by perfusing (1.0 l/min) with ozone and nitric oxides enriched air for three days. The state of aging of the extracted bitumen is assessed using the Dynamic Shear Rheometer (DSR). Significant differences between the employed bitumen are determined, which is probably caused by their different initial stiffness and their origin. The stiffness after VAPro of the extracted bitumen is between 1.2 and 2.6 times the RTFOT+PAV-aged state.

https://publik.tuwien.ac.at/files/publik_274625.pdf