MECHANICAL BEHAVIOUR OF RECYCLED ASPHALT MIXTURES USING COMPACTION BY IMPACT AND BY COMPRESSION

Abstract

The necessity of a sustainable development makes researchers and road agencies search for alternatives that bring benefits not only on the environmental sector but also to the social and economic as well. The utilization of the resultant material from the cutted deteriorated pavement overlay incorporated to the new mixtures instead of the new compounds contributes to the asphalt recycling process. This solution minimizes the misuse of non renewable natural resources, gives a proper destination to the residues, besides achieving expenses deduction on the recovery and maintenance of the road network. The goal of this paper is to study the mechanical behavior of the recycled asphaltic mixtures containing cutted material in different proportions: 5%, 10%, 15%, 20%, 25% and 30%. To achieve the purpose, trials of tensile strength and resilient modulus, compacted by impact (Marshall) and by compression (gyrations) were performed. The results reveal that from the studied recycled asphaltic mixtures, the most suitable to be used on flexible pavement are the ones with 10%, 15% and 20% of cutted material. It was also noticed the influence of the compaction methods in the mechanical behavior of the recycled asphaltic mixtures, once that gyrations compaction highly decreased the amount of vacant mixtures. Keywords: Cutted material, Marshall, Superpave, Tensile strength, Resilient modulus.