Contributions to the mix design and mechanical behavior of emulsion stabilized cold recycled asphalt mixtures.

• Ano de defesa: 2022
• Autor(a) principal: Meneses, João Paulo Costa
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: 3D-MOVE; Asfalto; Asphalt emulsion stability; Compaction method; CRAM; CRAM design; Dynamic modulus; Infraestrutura de transportes; Materiais betuminosos; Materiais de construção; Matric suction; Pavimentos flexíveis; Regression model; Three-dimensional simulation; Triaxial resilient modulus
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/3/3138/tde-28032022-131657/

Cold recycling of asphalt pavements implies in a smaller impact on the operation of the roads, with better use of natural resources and energy, reduction of gas emissions, in addition to reduced intervention/rehabilitation costs. Cold Recycled Asphalt Mixture (CRAM) mechanical behavior and durability-related properties are not well understood yet. Failure mechanisms need clarification, as well as solid design guidelines are still needed. This work is organized in research topics, and second chapter presents the main literature review. Many contributions to CRAMs study were given at this work. The effects of CRAMs compaction method (Proctor, Marshall, Gyratory, and Vibratory)were evaluated in terms of physical properties, mechanical tests (linear viscoelastic characterization) of compacted mixtures, and three-dimensional pavement analysis (3D-MOVE). The suction phenomenon was investigated through the filter paper method, and a parallel was drawn with the mechanical behavior of CRAMs and their composition. The mechanical behavior was investigated by means of the dynamic modulus and the triaxial resilient modulus tests. Additionally, the mix composition (active filler addition) effects on the mechanical behavior were evaluated, as well as the possible effects on asphalt emulsion stability. Additionally, the regression models of CRAMs dynamic modulus and triaxial resilient modulus tests results were evaluated. This work is a contribution to the better understanding of CRAMs mixture design assumptions, its mechanical response, and serves as an aid to the CRAMs laboratory investigations. The results of this work show that CRAMs have complex behavior and are influenced by several factors. Despite all efforts, there is still a long way to go for the cold recycling technique popularization.