MECHANICAL CHARACTERISTICS OF ROAD COMPOUNDED BITUMEN AT LOWTEMPERATURES
Zhurinov M.Z. Teltayev B.B. Amirbayev Y.D. Begaliyeva S.T. Alizhanov D.A.
2021National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2021#6Issue 45071 - 76 pp.
In this work the practical possibility has been shown for the manufacturing of a road bitumen with the improved low temperature characteristics by compounding of a viscous bitumen of the grade BND 100/130 with tar.The bitumen of the grade BND 100/130 has been produced by the Pavlodar petrochemical plant from the oil of Western Siberia (Russia) by direct oxidation. The standard characteristics of the bitumen satisfy the requirements of ST RK 1373-2013. The bitumen of the grade BND 100/130 and the tar from 5 to 30% have been used for preparation of the compounded bitumen by selection. A laboratory mixer (rotation rate is equal to 450-500 rotations per minute) and a container with heating have been used for the compounding of the bitumen under the laboratory conditions. Bitumen sample was heated up to the temperature of 120°С in the mixer, then the tar was added in the amount of 5, 10, 15, 20, 25, 27 and 30% by bitumen weight, and it was mixed for 30-40 minutes. Low temperature characteristics (stiffness and relaxation rate) of the bitumen have been determined on the bending beam rheometer at the temperatures of-24°С,-30°С and-36°С. Before testing the samples of the compounded bitumen have been subjected to double (short-term – RTFOT and long-term – PAV) aging. Optimum content has been determined for the tar in the bitumen, which is equal to 15-20 % by weight.
beam rheometer , bending , bitumen , compounding , relaxation fate , stiffness , tar
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JSC “D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry”, Almaty, Kazakhstan
Kazakhstan Highway Research Institute, Almaty, Kazakhstan
JSC “D.V. Sokolskiy Institute of Fuel
Kazakhstan Highway Research Institute
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