Estudo da viabilidade do uso de material fresado com adição de cimento como opção de base e sub-base em pavimentos

Abstract

The Brazilian road network has an extension of more than 212,000 Km paved. These roads have a lifetime of 10 to 20 years and require period maintenance. The milling of asphalt pavement is one of the techniques applied constantly in the process of restoration and maintenance of the road system. The milling involves the removal of old coating and the resulting material is usually discarded, being one of the major pollutants from roads maintenance. There are studies to reuse the milled material in works, as: the bearing layer, base and/or sub-bases. With the recycling process becomes possible to mitigate the impact on the environment. In this context, the main objective of this study is to analyze the feasibility of using milled material of roads with addition of cement for use in base or sub-base, in order to reuse the milled material and thus reducing the environmental impacts and increasing the resistance of the base and sub-base. The experiments showed that the compressive strength increases with the increase of cement addition percentage. However, the cement addition percentages adopted in this study (3%, 5% and 7%) did not reach the goal of 2.1 MPa strength after 7 days of curing, making unfeasible to use these mixtures as base flexible pavements. Nevertheless, it is possible to use these mixtures as sub-base.