Estudo do cimento asfáltico de petróleo modificado pelo terpolímero de etilieno-butilacrilato-glicidilmetacrilato

Abstract

The addition of polymers to petroleum asphalt cement (AC) used in pavement surfaces tends to improve the viscoelastic properties providing stability and durability to the material. In relation to pure AC, polymer modified asphalts have reduced thermal susceptibility and permanent deformation caused by traffic loads. The result is increased pavement life in service. The objective of the present work is to study an AC with penetration 50/60 produced by Petrobras/Lubnor as for its chemical and rheological properties as well as the resulting effects of incorporating the Terpolymer Elvaloy. Test results showed that the terpolymer investigated affects the rheological properties of the AC, which is evidenced by an increase in the dynamic viscosity, without changing the fluid behavior. The spectroscopy in the infrared area showed that the modified AC became more resistant to oxidative aging, reducing carbonyl formation (C=O) in the area from 1650cm-1 to 1680cm-1 (band area typical of oxidative aging) at the same time that it increases aging time. It was also found that the terpolymer acted as antioxidant making the AC more resistant to the process of induced aging.