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- W615157054 abstract "This report deals with issues of road bitumen non-conformity to Kazakhstan's sharp-continental conditions. Based on the analysis of air and asphalt pavement maximum and minimum temperatures, in recent years the bitumen requirements for different country regions have been substantiated, as well as zoning, as to the performance temperatures that have been developed. The results of investigating the high-temperature stability of a number of bitumens with a correlation model as well as their low-temperature stability using BBR (bending beam rheometer) have shown that they meet the requirements only for a small part of the Republic’s territory. In recent years, a number of polymer additives introduced both into bitumen and asphalt mix have been checked in situ: Kraton, Elvaloy, Sasobit, Butonal, TAFPACK-Super (TPS), TPS-F, etc. It has been found that at their introduction into bitumen, the low-temperature properties of polymer-modified bitumen either do not change or change insignificantly (for Elvaloy about 2°C per 1% of polymer) whereas their thermal resistance grows substantially: for each one percent of the introduced additive the increase is approximately by 6°C for Kraton, 14°C for Elvaloy, and 9°C for Sasobit. These results are in good agreement with the actual pavement condition." @default.
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- W615157054 date "2011-01-01" @default.
- W615157054 modified "2023-09-23" @default.
- W615157054 title "Bitumen and asphalt concrete requirements improvement for the climatic conditions of the Republic of Kazakhstan" @default.
- W615157054 hasPublicationYear "2011" @default.
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