Effect of addition of plant material (fiber of cutia chesnut) and polymer (SBS) on the properties of asphalt binder (CAP 50/70)

There is a need in the Brazilian market for asphalt binders that minimize premature structural failure of the coatings on urban roads, and the modification of asphalt cement oil (CAP 50/70) is an excellent option. In this research we used 2% w/w of the styrene - butadiene-styrene (SBS) copolymer and 2% w/w of natural fiber from Couepia edulis (Prance), known as cutia chesnut, which is a plant from the Amazon region with strengthening properties. The oxidative and thermal effects, as well as the physical characteristics of the asphalt modified materials, were studied and compared to the conventional binder, using the tests set by the National Agency of Petroleum, Natural Gas and Biofuels (ANP) and thermal analysis - thermogravimetry (TG) to determine the properties of thermal degradation and stabilization. In comparison with the traditional binders, the modified ones exhibited increased resistance to aging, evidenced by an increase in consistency, softening point and excellent thermal stability in the whole range of operating (10 ºC to 80 ºC ) and application (130 ºC to 170 ºC) temperatures for the asphalt cement oil, providing an option for regional pavements.

SBS copolymer; fibers; modified asphalt; Amazon; Couepia edulis; cutia chestnut

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