Efeito da adição do óleo de algodão refinado nas propriedades reológicas do cimento asfáltico de petróleo.

Abstract

The appeal for a sustainable development and greater energy efficiency in the area of asphalt paving has led to the search for lower temperatures of mixing and application of asphalt mixtures than those usually applied. Aiming at decreasing the pavement production temperature and the energy consumption, replacing the hot mix asphalt by warm-mix asphalt (WMA) is desirable. The utilisation of WMA poses to maintain and even enhance the pavement quality by using lower temperatures of execution. Therefore, new alternatives arise to achieve the objective. The use of oleic additives as asphalt binders modifiers can be a viable tool and beneficial to the environment as it can change its viscosity-temperature behaviour. Therefore, this research aims to evaluate thebasic and advanced rheological characteristics of the refined cotton oil addition to the asphalt binder in the contents of 1%, 2%, 3%, 4%, 5% and 6%. The samples were analysed by the tests of penetration, softening point, rotational viscosity, Rolling Thin Film Oven Test (RTFOT), Performance Grade (PG), continuous PG and Multiple Stress Creep Recovery (MSCR). The results showed that the oil addition in the studied contents allowed a reduction up to 10 oC in the production temperatures of the asphalt mixture in relation the non-modified binder. After the analyses of all results, it was determined that 4% was the optimum content of refined cottonseed oil addition, offering a decrease of 6°C, allowing to classify the mixture as WMA.