Influence of the Naphthenic-Aromatic Content of the Base Binder on the Characteristics of Crumb Rubber Modified Binders and Asphalt Mixtures

Juan Gallego, Ana María Rodríguez-Alloza and Rebeca Antón
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Juan Gallego: Departamento de Ingeniería del Transporte, Urbanismo y Territorio, Universidad Politécnica de Madrid (UPM), C/Profesor Aranguren 3, 28040 Madrid, Spain
Ana María Rodríguez-Alloza: Departmento de Ingeniería Civil: Construcción, Infraestructura y Transporte, Universidad Politécnica de Madrid (UPM), C/Alfonso XII 3, 28014 Madrid, Spain
Rebeca Antón: Departamento de Ingeniería del Transporte, Urbanismo y Territorio, Universidad Politécnica de Madrid (UPM), C/Profesor Aranguren 3, 28040 Madrid, Spain

Sustainability, 2019, vol. 11, issue 14, 1-14

Abstract: The extent of rubber-bitumen interaction in crumb rubber modified (CRM) binders depends on the contact time of rubber-bitumen as well as the temperature and mixing energy. However, this can vary depending on the composition of the base binders as well as the characteristics of the rubber particles (composition, method of grinding, and size). The present study aims to determine the influence of the composition of the base binders and the type of rubber on the properties of the crumb-rubber modified (CRM) binders and the performance of the asphalt mixtures produced with them. To carry out this project, two different base binders were chosen with the same penetration grade but different naphthenic-aromatic content (56.7 versus 46.0%). Additionally, different types of ambient ground rubber powder were evaluated: two different sources (70% of truck tyres +30% of passenger car tyres and 100% of truck tyres) and two different maximum particle sizes (0.8 and 1.25 mm). According to the main results of this study, higher naphthenic-aromatic content of the base binder results in greater modification of the CRM binders. Likewise, asphalt mixtures made with CRM binders from base binder with higher naphthenic-aromatic content appear to offer better performance in terms of water resistance and fatigue life.

Keywords: bitumen; naphthenic-aromatics; crumb rubber modified binders; asphalt mixtures (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
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