Roads and Bridges - Drogi i Mosty
14, 1, 2015, 47-65

Rheological properties of road bitumen binders modified with SBS polymer and polyphosphoric acid

Michał Sarnowski Mail
Warsaw University of Technology, Faculty of Civil Engineering
Published: 2015-04-22

Abstract

A commonly used method to improve the viscoelastic properties of road bitumens is polymer modification with styrene-butadiene-styrene (SBS). New binder modifiers are being searched for to provide a technically and economically justified alternative. A recent method of modification, which has been in use for over 15 years (mainly in the U.S.), is based on addition of polyphosphoric acid (PPA). The effect of modification with polyphosphoric acid is similar to that of oxidation, i.e. it increases the binder stiffness yet without compromising its low-temperature performance. The effect of modification with polyphosphoric acid has not been so far comprehensively tested in Poland. According to various reports from research projects carried out in different countries improvement of binder properties and durability of asphalt mixtures largely depends on the type of pure bitumen used. This paper describes the effect of PPA modifier on the rheological properties of a bitumen obtained from a Polish refinery.

Keywords


binder, polymer, polyphosphoric acid, rheological properties

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References


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Rheological properties of road bitumen binders modified with SBS polymer and polyphosphoric acid

  
Sarnowski, Michał. Rheological properties of road bitumen binders modified with SBS polymer and polyphosphoric acid. Roads and Bridges - Drogi i Mosty, [S.l.], v. 14, n. 1, p. 47-65, apr. 2015. ISSN 2449-769X. Available at: <>. Date accessed: 19 Dec. 2018. doi:http://dx.doi.org/10.7409/rabdim.015.004.