COMPARATIVE ANALYSIS OF ROAD BITUMEN TEMPERATURE SUSCEPTIBILITY
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 83, Issue
Abstract
The quality of asphalt concrete road pavements is determined by the quality of bituminous binders. Nowadays penetration, viscous systems and the Superpave system are used to specify bitumen in different countries of the world. In all systems both conventional (penetration, softening and fragility) and fundamental (viscosity, modulus, shear modulus, etc.) quality parameters are required. At the same time not enough attention is paid to bitumen temperature susceptibility, its objective determina-tion and rational standardization for all quality systems. Till now, only the "penetration index" is used to assess the temperature sensitivity of oxidized bitumen used in the road industry of Ukraine. With the adoption of DSTU EN 12591:2017 in Ukraine and the standardization of the dynamic viscosity at 60 ºС and kinematic viscosity at 135 ºС for the bitumen quality assessment, the issue of applicability of such temperature susceptibility parameters as "penetration-viscosity number", "viscosity-temperature susceptibility" and "penetration ratio" for the evaluation of local bitumen quality has appeared. The parameters of temperature susceptibility are analyzed; their positive aspects and disadvantages are established. Standard quality indicators, as well as penetration and viscosity in a wide temperature range are established for the local and foreign bitumen of different grades, produced by different technologies, that are used in the work. The parameters of the temperature-penetration susceptibility of bitumens were calculated on the obtained experimental data. The possibility of joint application of penetration index, determined by the temperature of the corresponding penetration of 800 × 0.1 mm and the "penetration ratio" is determined. It is established that the parameters "penetration-viscosity number", "viscosity-temperature susceptibility" are not applicable for oxidized bitumens of viscous grades. The reason for this is the viscosity anomaly inherent in the oxidized bitumen at a temperature of 60 ° C, which leads to a non-linearity of temperature-viscosity dependences in the range 60 ºС ... 135 ºС. The conclusion is drawn that the indicator "penetration ratio", determined according to the temperature corresponding to the penetration of 800 × 0, 1 mm., is the most suitable for assessment of the temperature susceptibility of the oxidized bitumen used in the road industry of Ukraine, taking into account the features of their rheological type, raw material and the technology of production.
Authors and Affiliations
Y. Pyrig
Keywords
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- EP ID EP466358
- DOI 10.30977/BUL.2219-5548.2018.83.0.12
- Views 91
- Downloads 0
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