Consideração da Textura Superficial avaliada a partir do Processamento Digital de Imagens (PDI) na seleção de Agregados Minerais para uso em revestimentos asfálticos

Abstract

The use of the Aggregate Image Measurement System (AIMS), based on Digital Image Processing (DIP), offers the possibility to evaluate the surface texture of aggregates and the microtexture of asphalt mixtures. There is, however, an incompatibility between the classification of these properties and the physical phenomenon of tire- pavement friction. This work seeks to associate such properties and indicate how to consider the surface texture for selecting aggregates with focus on road safety. It was evaluated the texture of real-scale airport runways and the aggregates used, based on traditional tests and two DIP techniques: AIMS and three-dimensional modeling, which is associated with models of friction prediction. It was observed a statistical significance of the mineral aggregates’ microtexture in the friction developed in the surface, thus it was suggested a table of minimum surface textures for the mineral aggregates’ matrix, in order to meet proposed limits of roughness of the asphalt mixture.