Análise dos parâmetros mecânicos das misturas asfálticas com adição de óxidos metálicos.

Abstract

The Conventional asphalt pavement, due to its dark coloring, absorbs a big quantity of energy which is transformed into heat, promoting a significant thermal discomfort for the people who live in this environment. This study deals with the addition of red pigments in the asphalt mixture to obtain colorful asphalt mixtures. The addition of metal oxides in asphalt mixtures emerges as a means of reducing the albedo and, consequently, minimizing the effects of the urban heat island, besides the advantage of the reduction in the operating temperature of the pavement, it is expected not to occur the decrease of the mechanical parameters to compromise the pavement structure. For this study, the asphalt binder was submitted to penetration, softening point and rotational viscosity tests and the aggregates characterized with the specific gravity, granulometry and abrasion tests Los Angeles. The Marshall dosage was used to produce the test specimens to be tested for quantification of the mechanical tests: Tensile Strength, Resilient Modulus and Marshall Stability. The mixture with 5% of metal oxide showed lower strength results than the reference mixture fabricated without dye addition. However, the asphalt mixture with dye meets the minimum requirements set by standard for all tests performed and may be used on colorful pavements to reduce the effect of urban heat island.