Resumo: Este trabalho tem por objetivo comparar, através de um programa experimental, misturas asfálticas dosadas por um Método Tradicional àquelas cujo proporcionamento dos agregados foi determinado pelo Método Bailey. O método Bailey diferencia-se dos métodos atualmente utilizados por, além de selecionar e avaliar a distribuição granulométrica dos agregados, se aproveitar da contribuição do esqueleto mineral sobre as características mecânicas das misturas asfálticas. O programa experimental comparou o desempenho de misturas cujo esqueleto mineral foi determinado através de duas maneiras diferentes (tradicional e Bailey), através de ensaios mecânicos e da consideração dos parâmetros obtidos na compactação giratória dos corpos de prova. Os resultados obtidos indicam a boa adequação do método Bailey na consideração do intertravamento das partículas para a obtenção de curvas granulométricas adequadas o que refletiu em melhoria de desempenho nas misturas estudadas. Será mostrado o desempenho quanto à rigidez, resistência, vida de fadiga e compactação giratória. DOI:10.4237/transportes.v20i4.574. Palavras-chave: Método Bailey, misturas asfálticas, seleção granulométrica.Abstract: This work aims to compare, through an experimental program, asphalt mixtures dosed by a traditional method to those whose household--the same proportion was given by Bailey. The Bailey method differs from the methods currently used for, in addition to selecting and evaluating the granulometric distribution of aggregates, to take advantage of the contribution of the mineral skeleton on the mechanical characteristics of asphalt mixtures. The experimental program compared the performance of mixes with mineral skeleton was determined by two different ways (traditional and Bailey), through mechanical tests and the consideration of the parameters obtained in gyratory compaction of specimens. The results obtained indicate good adaptation of the method in consideration of Bailey interlocking of particles for obtaining appropriate particle size curves which reflected in performance improvement in the mixtures studied. Performance will be shown on the stiffness, strength, fatigue life and gyratory compaction.
This was a study on the mechanical behavior of hot asphalt mixtures with regard to permanent deformation, considering static creep tests and the parameters derived from the Superpave compaction curve. For the asphalt mixture production, mineral aggregates and two types of asphalt binder (CAP 50/70 and AMP 60/85) were used. These mixtures were designed using the Superpave methodology and compacted in the content and number of gyrations according to the design. For the design condition, asphalt mixtures using the conventional CAP 50/70 asphalt binder showed better workability and lower deformation than asphalt mixtures with the AMP 60/85 polymer binder. Furthermore, the influence of asphalt binder content on the behavior of asphalt mixtures in relation to permanent deformation and compaction indices was studied, considering the maximum number of gyrations in the design. Regarding this investigation, asphalt mixtures with higher asphalt binder content tend to show higher permanent deformation and better workability. Complementarily, the compaction curve indices (Construction Densification Index, CDI; modified Traffic Densification Index, TDIm and Locking Point, LP) were correlated with parameters obtained from static creep tests (total deformation after the recovery period, Dt; creep modulus, CM and curve inclination, Icurve) through curves obtained by the correlation between these indices. Based on this analysis, a good correlation was found between the results of static creep tests and compaction indices, showing the potential of these indices for predicting the mechanical behavior of the analyzed mixtures in relation to the development of permanent deformations.
Com o avanço e desenvolvimento dos grandes centros urbanos, os serviços de tratamento de água e esgoto tem sido de enorme importância para a qualidade de vida da população. Porém, são geradas grandes quantidades de resíduos nos processos e a disposição final destes tem sido um grande problema para as autarquias e concessionárias. A pesquisa teve como objetivo precípuo realizar uma análise laboratorial de resíduos desidratados de estações de tratamento de água (lodo de ETA) da Região Metropolitana de Belo Horizonte-RMBH, visando sua utilização em camadas de pavimentos. O estudo realizou uma caracterização física, mecânica, química, ambiental e biológica em lodos provenientes das ETAs de Bela Fama, município de Nova Lima-MG e da ETA Rio Manso/Paraopeba localizada no município de Brumadinho-MG. Além da caracterização dos lodos puros, estudou-se o comportamento mecânico dos mesmos e também quanto estabilizados quimicamente com teores específicos de cal hidratada e cimento Portland.
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