Abstract
The study described in this paper focused on the possible use of waste products coming from the production of styrene–butadiene rubber (SBR) and polybutadiene rubber (PBR), as bitumen modifiers. Modified binders containing these products were prepared in the laboratory with different polymer dosages and were thereafter subjected to the evaluation of empirical and rheological properties. For comparative purposes, the study also considered SBR and PBR products of premium quality. Ageing effects were also taken into account by means of proper laboratory simulations. Obtained results indicated that the two types of polymer (SBR and PBR) have completely different effects on the rheology and expected performance of the resulting modified binders. In particular, while the two polymers showed similar effects in terms of resistance to permanent deformation, the SBR products proved to be superior from the viewpoint of fatigue resistance. However, only minor differences were found when comparing the effects produced by premium quality and waste polymers. As a result of the experimental findings, it was concluded that the use of waste SBR polymers can be an attractive solution for the production of affordable modified binders.
Highlights
Polymers have been used extensively as bitumen modifiers to improve the performance of asphalt pavements [1,2,3,4]
With respect to the tests carried out on polymers, it can be observed that the two styrene–butadiene rubber (SBR) products of different quality showed similar spectra, with an excellent matching of the positions of all peaks
polybutadiene rubber (PBR) may have completely dissolved in bitumen due to the high content of aromatics, whereas it may be hypothesized that SBR may have formed inner polymeric domains distributed within the
Summary
Polymers have been used extensively as bitumen modifiers to improve the performance of asphalt pavements [1,2,3,4]. Several studies have shown that such improvements occur in the form of an enhanced resistance to rutting, thermal cracking, and fatigue damage [4,5,6,7,8]. Few studies have focused on the use of polybutadiene rubber (PBR), which is more frequently employed by the tire industry and in the manufacturing of abrasion-resistant products (including footwear, floor tiles, industrial components) [16,17,18]. As a result of the local availability of raw materials, SBR and PBR are among the most widely produced polymers in Iran [17,19]. It has been reported that currently employed production
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