Análise da rigidez de misturas recicladas a frio estabilizadas com emulsão e incorporação de cimento ou cal

• Ano de defesa: 2023
• Autor(a) principal: Fabris, Alana Devitte
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; Engenharia Civil; UFSM; Programa de Pós-Graduação em Engenharia Civil; Centro de Tecnologia
• Palavras-chave em Português: Reciclagem de pavimentos; Ensaio traxial de cargas repetidas; Bases granulares estabilizadas; Módulo de resiliência; Emulsão asfáltica; Pavement recycling; Triaxial repeated load test; Stabilized granular bases; Resilience module; Asphalt emulsion; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL
• Link de acesso: http://repositorio.ufsm.br/handle/1/31902

Economic and demographic growth is strictly linked to road infrastructure, due to the majority of commercial and leisure transport using roads. As a result, road pavements require maintenance and structural development. Another factor, in parallel, is the disposal of industrial materials and the scarcity of natural resources, which could possibly be problems partially solved by using recycling to develop new pavements. That being said, the use of milled material, from the recovery and maintenance of deteriorated pavements, has been gaining notoriety, as it contributes economically and sustainably to the development of methods for its application in paving, standing out in the application in base and sub-base layers. . However, its use has limitations, which require the application of techniques that improve the conditions of this input, such as stabilization, which becomes a functional, economical and sustainable option. The present study aims to analyze the resilient behavior of cold recycled mixtures, with milled material stabilized with emulsion, added with Portland cement or hydrated lime, by applying comparative stiffness models aiming for use in base and sub-base layers of pavements. For this to occur, three cold recycled mixtures stabilized with 3% slow breaking asphalt emulsion (RL – 1C) were prepared, the first with only emulsion (ME3), the second with emulsion and 1% Portland cement (ME3 Cim1) and the third with emulsion and 1% hydrated lime (ME3 Cal1). The test specimens were molded in Proctor following the Petrobrás Network 04 procedure (2010). The samples underwent a 48-hour curing process at 60°C according to AASHTO, (2023). The Triaxial Resilience Module (MR) test followed the specifications of the DNIT 134/2018-ME standard, therefore, the samples were subjected to 18 pairs of confident stresses, which simulated in the laboratory the stresses applied to the pavement by the soil and loads of traffic. In order to analyze the resilient behavior, regression models were applied and comparisons were made with other reference granular materials. Furthermore, the mixtures were analyzed using the MeDiNa software, with the aim of comparing and verifying the influence of material contents on the sizing of the layers. Finally, it was concluded that stabilization with emulsion and the additions of Portland cement and lime met the demands of the base layers and reduced the thickness of the coating layer, contributing to the expansion of studies regarding the use of alternative materials for paving. It is noteworthy that the addition of hydrated lime provided gains in stiffness and improved the properties of cold recycled mixtures stabilized with asphalt emulsion.