Laboratorieundersoekningar av Bitumens Aldringsegenskaper (Laboratory Investigations of Bitumen Ageing Properties)

摘要

Comparative laboratory investigations of the aging properties of bitumen using two standardized methods, TFOT (Thin Film Oven Test, ASTM D 1754) and RTFOT (Rolling Thin Film Oven Test, ASTM D 2872), have been performed. Forty-seven samples of bitumen produced at three refineries from six different crude oils have been examined before and after heating in accordance with TFOT and RTFOT respectively. The parameters investigated are penetration at 25 and 10 degrees C respectively, dynamic viscosity at 60 degrees C, kinematic viscosity at 135 degrees C and change in mass in TFOT and RTFOT respectively. The penetration index, retained penetration and viscosity ratio have been calculated.