Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
13.
An Assessment of the Impact of Accelerated Ageing on the Service Life of Bituminous Waterproofing Sheets
Kunič, Roman ; Orel, Boris, 1943- ; Krainer, Aleš
It is not surprising that there has been a considerable increase in recent years in the number of research activities on the scientific and applicative level devoted to analyses of accelerated ...ageing, determination of service lifeand life cycle assessment of constructional complexes. The primary objective of the research was to define the theoretical base supporting measurements of accelerated testing and the connection between ageing and the service life of bituminous sheets. Arrhenius law of accelerated testing as a theoretical support to experimental testing of bituminous sheets at high temperature and different exposure times was used. The current procedure of accelerated ageing of bituminous sheets in accordance with European Norms (EN)[EN 1296: 2001, EN 1297: 2004] takes 24 weeks at a testing temperature of +70.0°C. The test procedure is fairly long and takes place at a relatively lowtemperature, which does not represent a significant thermal load in the ageing of the majority of bituminous products. According to our measurements and calculations, a shortened testing time of accelerated ageing of 12 weeks requires an equivalent ageing temperature of +82.0°C for oxidized bituminous products, +79.2°C for APP modified bitumen and +76.5+C for SBS modified bitumen products, in order to achieve the same impact of accelerated ageing onbituminous sheets, since it provides testing procedures according to the standard. These results are useful in order to control quality, testing resistance to ageing and determining the life expectancy of bituminous products, the characteristics of which are determined in a significantly shorter time.
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