Study of Permanent Deformation and Granulometric Distribution of Graded Crushed Stone Pavement Material

Abstract

The pavement's structural distresses are linked to resilient and permanent deformations, which are accumulated during the pavement lifetime. The material choice for base and sub-base is important to have a good performance of the pavement. Crushed granular material particle size selection is important to decrease permanent deformation, but it is not common to practice. In order to this information, the present study aims show that the distribution of unbound granular material particle size can affect the structure of the pavement. For this purpose, two similar types of granite-gneiss crushed stone were studied in two distinct granulometric curves in specimens 10x20 cm by repeated triaxial loading permanent deformation tests using nine pairs of different stresses at a frequency of 1 and 2 Hz for load cycles greater than 150.000 to predict the shakedown and the Guimarães model parameters. The different granulometric curves are similar for both materials and based on Fuller method and the Bailey method. The article shows new parameters of Guimarães model and the necessity of attention to granulometric distribution analysis of the stone skeleton for granular base and sub-base layers.