Low temperature resistance increase for bitumen by compounding with Tar
Teltayev B. Seilkhanov T. Oliviero Rossi C. Amirbayev Y. Begaliyeva S.
September 2021MDPI
Applied Sciences (Switzerland)
2021#11Issue 18
In this paper, a conventional road bitumen with penetration grade 100–130 is compounded with tar in order to obtain bitumen with improved low temperature resistance. The low temperature (at −24◦C, −30◦C and −36◦C) resistance of the virgin bitumen and the compounded one is evaluated by testing on a bending beam rheometer. It was found that the optimum compounding (20% of tar by weight) decreases the stiffness essentially (from 18% to 34%), i.e., it increases the low temperature resistance of the bitumen. The stiffness decreases in the compounded bitumen can be explained by quantitative variations in its group chemical composition and molecular fragments. Group chemical composition has been determined by the method of absorption chromatography, and the fragments of molecules are identified by NMR-spectroscopy.
Bending beam rheometer , Bitumen , Compounding , Group chemical composition , NMR–spectroscopy , Stiffness , Tar
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Kazakhstan Highway Research Institute, Almaty, 050061, Kazakhstan
Department of Chemistry and Biotechnology, Sh. Ualikhanov Kokshetau State University, Kokshetau, 020000, Kazakhstan
Department of Chemistry and Chemical Technologies, University of Calabria, Rende, 87036, Italy
Kazakhstan Highway Research Institute
Department of Chemistry and Biotechnology
Department of Chemistry and Chemical Technologies
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