INFLUENCE OF THE CONDITIONS OF DETERMINATION ON THE SOFTENING POINT TEMPERATURE OF BITUMENS
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2019, Vol 84, Issue
Abstract
In the road sector of Ukraine conventional quality indicators are applied to estimate the quality of road petroleum bitumen. One of the leading indicators is the softening point temperature by a «ring and ball» test. The experimentally obtained value of the softening point temperature depends on the test conditions, which are currently standardized by the GOST 11506. In Ukraine 2019, the harmonized Eu-ropean standard DSTU EN 1427 is introduced to replace GOST 11506. According to this, the issue of comparing softening point temperature tests, which is standardized in different standards, is of current interest. The analysis and experimental comparison of the softening point temperature values of road viscous bitumens determined by the tests specified in GOST 11506 and DSTU EN 1427 was the aim of this study. The influence on the softening point tempera-ture value of such parameters as: the kind of thermo-static liquid; the ring shape; the presence of a stirrer for liquid circulation and the speed of its rotating; heating rate of thermostatic liquid in the glass; sample holding time before the test are experimen-tally verified. It was found that the most fundamen-tal difference between the two standards is the ap-proach to normalizing the heating rate of a thermostatic liquid. If the requirements of the methods of the two standards for normalizing the rate of heat-ing of the fluid are met, the difference in the values of the softening temperature may exceed the permissible values of reproducibility. A distinctive feature of the standard DSTU EN 1427 is orientation to greater accuracy of the test. This results in smaller tolerances for the sizes of the forms; in a higher ac-curacy of the softening point temperature reading; using platinum thermal sensors to measure tempera-ture instead of mercury thermometers; in smaller values of normalized reproducibility, etc. In general, the transition to the method of the softening temperature determining according to DSTU EN 1427 can-not cause either methodological or technical difficulties. It is desirable to use semi-automatic or automatic devices for determining the softening temperature in road laboratories.
Authors and Affiliations
Y. Pyrig
Keywords
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- EP ID EP553907
- DOI 10.30977/BUL.2219-5548.2019.84.0.75
- Views 100
- Downloads 0
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