Encontrados 23 documentos, a visualizar página 1 de 3
Treatment performance capacity – A tool to predict the effectiveness of mainten...
Sousa, Jorge B.; Way, George; Pais, Jorge C.The California Department of Transportation (Coltrans) employs a variety of pavement preservation treatments to maintain and preserve their network of paved highways. In this work a model was developed lo relate asphalt treatment life in terms of Treatment Performance Capacity (TPC), pavement condition, traffic level and location temperatures for all asphalt based treatments. This model is able to provide estim...
Influence of crumb rubber and digestion time on the asphalt rubber binders
Neto, Silvrano Adonias Dantas; Farias, Márcio Muniz de; Pais, Jorge C.; Pereira, Paulo A. A.; Sousa, Jorge B.This paper shows the results of a study about the mechanical behavior of dense graded asphalt-rubber hot mixes prepared with two different types of asphalt-rubber binders. These asphalt-rubber binders were obtained with penetration grade asphalt (AC 50/70) mixed with 21% and 25% of crumb rubber in weight. The rubber was recycled from unserviceable tires using the ambient grinding process. Hot mixes made with th...
A mechanistic-empirical based overlay design method for reflective cracking
Sousa, Jorge B.; Pais, Jorge C.; Way, George B.This paper describes a new and innovative mechanistically based pavement overlay design method that considers the most predominant type of overlay distress observed in the field: Reflective cracking above old cracks in the underlying pavement surface. Both dense-graded hot mix asphalt and gap-graded asphalt rubber (wet process) mixes were studied, in the laboratory and in the field, to derive the necessary mech...
Avaliação das propriedades físicas dos ligantes modificados com borracha granul...
Neto, Silvrano Adonias Dantas; Farias, Márcio Muniz de; Pais, Jorge C.; Sousa, Jorge B.Este trabalho consiste no estudo das propriedades físicas de ligantes modificados com borracha. Os principais parâmetros analisados são a influência do tipo de ligante e do tempo de digestão empregado, para um determinado teor de borracha e temperatura de digestão. Para o estudo das propriedades físicas dos asfaltos-borracha foram utilizados três tipos de ligantes convencionais diferentes CAP 35/50, CAP 50/70 e...
Propriedades mecânicas de misturas betuminosas confeccionadas com asfalto-borracha
Neto, Silvrano Adonias Dantas; Farias, Márcio Muniz de; Pais, Jorge C.; Sousa, Jorge B.Tendo em vista as principais características das rodovias brasileiras com altos níveis de deterioração e elevadas cargas por eixo, além de nossas condições climáticas, as misturas confeccionadas com asfalto-borracha apresentam um grande potencial de utilização. Este trabalho consiste no estudo do comportamento mecânico das misturas asfálticas confeccionadas com ligantes modificados com borracha granulada de pne...
Mode of loading on flexural fatigue laboratory properties of conventional and a...
Sousa, Jorge B.; Pais, Jorge C.; Pereira, Paulo A. A.; Way, George B.Traditionally the correct modeling and prediction of asphalt fatigue mechanisms, has re-lied on the use of the appropriate mode of loading in laboratory tests. The mode of load-ing chosen should, as closely as possible, reflect the mode of loading that causes crack propagation in the field. However recent formulations may be opening the door to the determination of key parameters from either mode of loading. Fa...
Evaluation of the load associated cracking in flexible pavements
Pais, Jorge C.; Pereira, Paulo A. A.; Sousa, Jorge B.; Capitão, Silvino DiasThe overlay of a cracked pavement is subject to reflective cracking due the existing crack potential. In a cracked pavement, this cracking potential, due to traffic loads and temperature gradient, can be evaluated by means of crack activity. Traffic loads cause vertical and horizontal activity between the two edges of the cracks. These activities are caused by rocking of blocks between the cracks as well as by ...
Development of a mechanistic-empirical based overlay design method for reflecti...
Sousa, Jorge B.; Pais, Jorge C.; Saim, Rachid; Way, George B.; Stubstad, Richard N.This paper describes a new and innovative mechanistically based pavement overlay design method that considers the most predominant type of overlay distress observed in the field: Reflective cracking above old cracks in the underlying pavement surface. Both dense-graded hot mix asphalt and gap-graded asphalt rubber (wet process) mixes were studied, in the laboratory and in the field, to derive the necessary mech...
Método de dimensionamento de reforços para controlar a reflexão de fendas
Sousa, Jorge B.; Pais, Jorge C.; Saim, Rachid; Way, George B.Esta trabalho descreve um novo método empírico-mecanicista para o dimensionamento de reforços de pavimentos de modo a controlar um dos mais predominantes processos de ruína de pavimentos, a reflexão de fendas. Tanto as misturas convencionais como as misturas descontinuas com betume borracha foram estudadas, tanto em campo como em laboratório, para o desenvolvimento dos modelos mecanicistas e estatísticos. Os m...
Effect of crumb rubber origin on asphalt rubber hot mix laboratory performance
Pais, Jorge C.; Sousa, Jorge B.; Saim, Rachid; Pereira, Paulo A. A.Asphalt rubber traditionally has been produced with crumb rubber coming from an ambient grinding process and mostly from car tires. With this product and the binders used in Arizona and California the specifications currently present in ASTM D 6114 have been established. Nowadays relatively new types of crumb rubber are available in the markets namely those that have been produced by cryogenic methods and can ...
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