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.
Highlights
Nowadays, the principal nations generate millions of used tyres all over the world
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
All crumb rubber used in this study was produced by the ambient grinding process, as this method of grinding increases the swelling rate when compared with cryogenically ground rubber [21]
Summary
The principal nations generate millions of used tyres all over the world. Instead of being sent to landfills, the rubber powder obtained from end-of-life tyres (ELTs) is being used in different applications like rubber modified asphalt materials for road construction and maintenance [1]. The service life of asphalt rubber (AR) mixtures is longer when compared to conventional mixtures [4] These mixtures offer better performance under heavy traffic loads, and higher resistance to rutting at high temperatures and to thermal cracking at low temperatures [5,6]. These facts can be related to the modification of the binder by rubber and comparable with binders modified with Styrene Butadiene Styrene (SBS), as Lo Presti et al have demonstrated [6]. The evolution of the properties with the storage time demands special studies [11]
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