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Appl. Sci. 2019, 9(8), 1567; https://doi.org/10.3390/app9081567

Experimental Study to Determine the Most Preferred Additive for Improving Asphalt Performance Using Polypropylene, Crumb Rubber, and Tafpack Super in Medium and High-Temperature Range

1,*,† and 1,2,*,†
1
School of Transportation, Southeast University, Nanjing 210096, China
2
Department of Civil Engineering, Nyala Technological College, South Darfur, Nyala P.O. Box 155, Sudan
*
Authors to whom correspondence should be addressed.
Those authors contributed equally to this work.
Received: 25 February 2019 / Revised: 9 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
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Abstract

The overall objectives of this study were to determine the most appropriate additive for improving the physical properties and the medium- and high-temperature performances (mechanical performance) of asphalt binders. Three different types of modified binders were prepared: crumb rubber modifier (CRM), polypropylene (PP), and tafpack super (TPS), which had concentrations of 2%, 3%, 3.5%, and 4% by weight of asphalt binder, for each modifier. Their physical and rheological properties were evaluated by applying various tests such as ductility, rotational viscosity, toughness, and tenacity, as well as the dynamic shear rheometer (DSR) test. As a result, the physical properties of the modified bitumen binders were compared, as were the medium- and high-temperature performances (mechanical performance), which had temperatures of 58, 64, 70, 76, 82, and 88 °C, respectively. This was how the most appropriate modifier was determined. The results demonstrated that the asphalt binder properties significantly improved by utilizing CRM followed by PP and TPS modifiers. The increase in the rutting parameter (G*/sin(δ)) after asphalt modification indicated its excellent performance at both medium- and high-temperatures. Lastly, the CRM was determined as the most preferred additive because of its positive effect on the physical properties and enhancement of the medium- and high-temperature performance (mechanical performance). View Full-Text
Keywords: crumb rubber modifier; modification; tafpack super; viscoelasticity; polypropylene crumb rubber modifier; modification; tafpack super; viscoelasticity; polypropylene
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xiaoming, H.; Eldouma, I.B. Experimental Study to Determine the Most Preferred Additive for Improving Asphalt Performance Using Polypropylene, Crumb Rubber, and Tafpack Super in Medium and High-Temperature Range. Appl. Sci. 2019, 9, 1567.

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