Characterization of two types of modified sulphur pellets for sulphur-extended asphalt mixtures
Sakanov D.K. Aspanbetov D.A. Sakanov K.T. Nurmetov S. Borshchev N.V. Lou B. Barbieri D.M.
June 2024Elsevier B.V.
Results in Engineering
2024#22
The application of sulphur to partially replace traditional bituminous binder in asphalt mixture can offer attractive technical, economic and environmental advantages. Globally, Kazakhstan is the seventh largest producer of sulphur as this element is abundantly generated by many petroleum refining industries. This study concisely evaluates the performance of asphalt mixtures added with two types of modified sulphur pellets pivoting on laboratory and field investigations. Wheel track tests indicate a substantial reduction in rutting development for sulphur-extended asphalts (average final value ≈ 2 mm) compared to unmodified ones (average final value ≈ 7 mm). Further, uniaxial tension stress tests evaluating the durability at −20 °C, −30 °C, −40 °C document very similar results between modified and regular mixtures in terms of tensile strength and corresponding failure strain. Eventually, the construction of a pilot road surface stretch laid employing the sulphur-based pellets points at an approximate 5 % economic saving. Such promising experimental outcomes buttress the application suitability of sulphur-extended asphalt mixtures in Kazakhstan and encourage further thorough research in this direction.
Durability , Modified sulphur pellet , Road pavement , Rutting , Sulphur-extended asphalt mixture
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Kazakhstan Highway Research Institute, E. Serikbaeva st. 25, Astana, Kazakhstan
Toraighyrov University, Department of Industrial Civil and Transport Construction, Lomov st. 64, Pavlodar, Kazakhstan
Kazaq Bitum, Luhanskogo st. 96, Almaty, Kazakhstan
Norwegian University of Science and Technology, Department of Civil and Environmental Engineering, Høgskoleringen 7A, Trøndelag, Trondheim, 7491, Norway
Oslo Metropolitan University, Department of Built Environment, Pilestredet 35, Oslo, 0166, Norway
Kazakhstan Highway Research Institute
Toraighyrov University
Kazaq Bitum
Norwegian University of Science and Technology
Oslo Metropolitan University
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