Naslov
Permanent deformation of polymer modified bitumen

Autori
Ocelić Bulatović, Vesna ; Rek, Vesna ; Jurkaš Marković, Kristina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Road and Rail Infrastructure II / Stjepan Lakušić - Zagreb : Građevinski fakultet Sveučilišta u Zagrebu, 2012, 317-326

ISBN
978-953-6272-49-5

Skup
2nd International Conference on road and rail Infrastructures-CETRA 2012

Mjesto i datum
Zagreb, Hrvatska; Dubrovnik, Hrvatska, 07.05.2012. - 09.05.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
PmB; DSR; rheological properties; permanent deformation; SHRP

Sažetak
Bitumen (BIT) has been used in most road applications for many decades as the binder for asphalt. The most common distresses directly associated with the binder phase in road are a permanent deformation known as rutting and thermal cracking. This has resulted in the need to improve the properties of existing bitumen. In order to produce BIT with improved properties, polymers are used. It is known that the modified binders vary significantly in their sensitivity to traffic speed, to traffic volume, and to stress or strain level that varies according to the pavement structure, which has indicated the importance of investigations into rheological properties. The investigation into rheological properties of polymer modified bitumens (PmBs), with various polymers as potential modifiers, as well as of bitumens, makes it possible to characterize and evaluate PmBs as binders. The Strategic Highway Research Program (SHRP), a research program in the field of road construction, includes the investigation into rheological properties at a traffic frequency and a temperature, which gives an insight into a permanent deformation known as rutting and into the effect of thermo-oxidative ageing. In this paper, the following polymers are used as bitumen modifiers: styrene –butadiene-styrene block copolymers, linear and radial structure (SBS-L, SBS-R), plastomer ethylene- vinyl acetate (EVA) and reactive polymer ethylene butylacrylate glycidylmethacrylate (Elvaloy AM). Resistance to permanent deformation includes investigations into rheological properties of BIT and PmB performed by a dynamic shear rheometer (DSR) in a broad temperature range at a traffic frequency before and after ageing. The ageing of the investigated materials and their thermo-oxidative stability are determined by the Rolling Thin Film Oven Test (RTFOT). Polymer modified bitumens are less sensitive to temperature and traffic speed than bitumen. They have a higher critical temperature, i.e. better resistance to permanent deformation. The critical temperature depends on the polymer type and content.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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