Utilização de revestimento asfáltico fresado em misturas asfálticas a quente para camadas de pavimentos

Abstract

The road modal in Brazil is very important, concentrating about 60% of the cargo transportation in the territory. In that modal, there is still a predominance of the use of asphaltic pavements, counting more than 200 thousand kilometers paved. However, the whole project has a project life, and when it is done, it is necessary to review the structure of the project, analyzing all its layers. Proper maintenance would be the milling the pavement, so that the layer that no longer serves is removed from the structure. The residue from the milling of the track is known as RAP (Reclaimed Asphalt Pavement). This residue has, besides the aged binder, a quantity of aggregate materials that are not affected by the track traffic, maintaining its characteristics and properties. In São Luís, besides not use of the Reclaimed Asphalt Pavement for new mixtures compositions, it is necessary that a company be hired to give the correct destination to the material. There are expenditures with new aggregate materials and also expenses with the company's waste removal. Therefore, the present work has the objective of investigating the characteristics of the RAP, coming from street José Sarney (São Luís – MA), and analyze the viability or not of the use of this residue as an aggregate of hot asphalt mixture. In order to do so, several laboratory tests were carried out, until 4 types of new mixtures were defined, being 3 mixtures recycled with 61%, 50% and 25% of RAP and one conventional asphalt mixture, without use of RAP. Only one of the recycled mixtures presented satisfactory results, resulting in a saving of 25% in raw material, compared to conventional mixing, favoring the budget of the work and the environment