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M Smesnik, P. Tschernutter:
"Relationship between the production process and the long-term behavior of asphalt facings on rock-fill dams (AFRD)";
Talk: Annual Meeting of International Commision on Larg Dams 2017, Prague (invited); 2017-07-03 - 2017-07-07; in: "Proceedings - Knowledge Based Dam Engineering", ICOLD, Prague (2017), ISBN: 978-80-906662-2-1; 1 - 10.

Asphalt facings on rock-fill dams (AFRD) have to be watertight and able to absorb strains without
suffering from cracking and thus losing their sealing ability. As an effect of the aging process, bitumen becomes stiffer and more brittle accompanied by a deterioration of the asphalt flexibility. The aging process is divided into short-term (ASTA) and long-term (ALTA) aging. Investigations have shown that a crucial part of the deterioration of the good performance characteristics occur while ASTA. To increase the durability of asphalt facings it is important to minimize these aging effects during the construction process. Construction sites in hydraulic engineering are in many cases in remoted areas. This leads to extended material hauling times and strong short-term aging effects caused by high mix temperatures. This paper presents a newly developed short-term lab-aging procedure (HMAAT - Hot Mixed Asphalt Aging Test) to assess the change of the material characteristics as a consequence of extended material hauling times and related high mix temperatures of the bitumen. The comparison of bitumen aging conditions of inventory data and artificial lab-aged bitumen samples presented in this paper confirms the crucial influence of the ASTA on the whole aging process (ATOTAL).

HMA, Material Aging, HMAAT,

http://publik.tuwien.ac.at/files/publik_260446.pdf