Physical and Rheological characterization of modified bitumen by NBR/EVA association

摘要

This paper presents the use of NBR waste (nitrite butadiene rubber) in association with commercial polymer EVA (ethylene vinyl acetate) in the bitumen modification in order to improve its physical and rheological properties. Experimental tests such as penetration, softening point, and dynamic shear rheometer (DSR) at high in service temperature were performed in the conventional and modified binders. The results showed, an improvement in physical properties: decrease in penetrability and increase in softening point, and an improvement in the rheological characteristics such as shear modulus G*, phase angle delta and rutting resistance at high in service temperature represented by the parameter G*/sin delta. The results also showed a logical consistency in the association NBR/EVA, modified binders B + 5%[NBR/EVA] gave intermediate results between the two binders containing 5%NBR and 5%EVA separately. These performances improve when the EVA proportion increases in this association. The use of this association is not only to improve the bitumen characteristics, but also to minimize the proportions of NBR waste at landfills.