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Manuel Navarro-Gonzalez, Manfred H. Wagner
Storage stability of bitumen modified by the addition of ground rubber, swollen SBS and polymeric short fibers

Appl. Rheol. 22:2 (2012) 24691 (11 pages)

Bitumen is used as binder for asphalted roads worldwide. However the service life of asphalt roads is limited due to the viscoelastic properties of bitumen. The lack of yield stress and the flow behavior at high temperatures as well as the stiffness of bitumen at lower temperatures results in the main failure sources of asphalt roads. Many polymers have been used in industry to improve the rheological behavior of bitumen and consequently, service life of roads. The polymers are commonly added to hot bitumen under stirring in order to achieve a stable dispersion. However, most polymers show little to no miscibility in bitumen, which requires long dispersion times and may lead to oxidation of bitumen and degradation of the polymers. Poor miscibility of the dispersed polymer and the bitumen matrix can result in phase separation during transport of molten bitumen, leading to a heterogeneous binder and further failure of the paved road, which is a common problem in the paving industry. Rubber pre-treating leads to a faster mixing process without compromising dispersion quality and stability. Bitumen was modified with SBS, ground rubber and chopped fibers of polymers. These fibers, which showed good stability, can be considered for the future as bitumen modifiers. To evaluate the stability of the modified bitumen, we propose a stability index.

Cite this publication as follows:
Navarro-Gonzalez M, Wagner MH: Storage stability of bitumen modified by the addition of ground rubber, swollen SBS and polymeric short fibers, Appl. Rheol. 22 (2012) 24691.


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