Utilização da parte fina de misturas asfálticas para avaliação do dano por fadiga

• Ano de defesa: 2012
• Autor(a) principal: Coutinho, Renato Peixoto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Transportes; Pavimentos de asfalto; Dano - Fadiga
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/4888

Fatigue cracking is a major damage found in asphaltpavements. Fatigue is caused by dynamic loading or temperatures cycles. This damage is caused by vehicle traffic and is directly affected by variation in climatic conditions to which the asphalt mixture is subjected. Problems such as fatigue andrutting are related to small-scale phenomena. Some factors which influence the development of fatigue cracks are the asphalt content, aggregate characteristics (shape, size and particles distribution) as well as by the properties of the binder-aggregate interface. This study aims to characterize the linear viscoelasticity and the fatigue damage of the fine part of Hot Mixes Asphalt (HMAs), consisting of Asphalt Cement (ACs), fine aggregates and fillers, called Fine Aggregates Matrices (FAMs). The results were compared with those obtained in the characterization of ACs and HMAs. For the characterization of FAMs, samples were prepared to represent realistically the fine part of their respective MACs. A new design method has been proposed for MAFs. The characterization of fatigue damage in FAMs was performed using a traditional method (time sweep) and the Linear Amplitude Sweep test (LAS). The LAS is based on the viscoelastic continuum damage (VECD) mechanics theory. The results showed that the LAS obtained similar results to those found in the traditional method (maximum error of 15%). Moreover, it was observed that the use of FAM as an intermediate step for predicting fatigue damage behavior of HMAs showed satisfactory results.