Comportamento mecânico preliminar de misturas asfálticas recicladas a frio contendo 100% de rap e diferentes teores de cimento portland

Abstract

Milling of asphalt pavements plays a fundamental role in the maintenance and rehabilitation of roads and highways. This process involves removing the worn-out surface layer of asphalt, providing significant benefits such as restoring surface texture, correcting pavement imperfections, and the potential for recycling the milled asphalt (Reclaimed Asphalt Pavement - RAP). This material has gained prominence in the construction industry as a promising option for the implementation of economical and sustainable roadworks. However, there is a lack of references and data related to the mechanical performance of cold recycled mixtures. In this regard, this study aims to produce different cold recycled asphalt mixtures, using 100% milled material or RAP (Reclaimed Asphalt Pavement) and varying amounts of cement, in order to assess the influence of the binder in the mixture. The approach involves the preparation of asphalt mixtures using Marshall mix design, with a compaction energy of 50 blows on each face of the specimen, followed by conducting mechanical tests to evaluate performance. These tests encompass aspects such as stability, flow, tensile strength by diametral compression, and volumetric analysis.The results indicated that the addition of cement provided improvements in the mechanical and volumetric characteristics of the mixture. Additionally, the use of RAP proved to be a viable alternative for reducing the asphalt content in pavement mixtures.