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Multi-cracks modeling in reflective cracking
Pais, Jorge C.; Minhoto, Manuel J. C.; Shatnawi, ShakirReflective cracking is a major concern for engineers facing the problem of road maintenance and rehabilitation. The problem appears due to the presence of cracks in the old pavement layers that propagate into the pavement overlay layer when traffic load passes over the cracks and due to the temperature variation. The stress concentration in the overlay just above the existing cracks is responsible for the appea...
Asphalt rubber interlayer benefits in minimizing reflective cracking of overlay...
Shatnawi, Shakir; Pais, Jorge C.; Minhoto, Manuel J. C.This paper provides an overview of the asphalt rubber interlayer benefits on reflective crack retardation in overlays over rigid pavements. These interlayers are known in California as asphalt rubber absorbing membrane interlayers (SAMI-R) or as asphalt rubber aggregate membrane interlayers (ARAM-I) chip seals. The paper focuses on the performance in terms of field project reviews, laboratory performance tests ...
Asphalt rubber interlayer benefits on reflective crack retardation of flexible ...
Shatnawi, Shakir; Pais, Jorge C.; Minhoto, Manuel J. C.This paper provides an overview of the asphalt rubber interlayer benefits on reflective crack retardation in flexible pavement preservation and rehabilitation strategies. These interlayers are known in California as asphalt rubber absorbing membrane interlayers (SAMI-R) or as asphalt rubber aggregate membrane interlayers (ARAM-I) chip seals. These interlayers have been used successfully as part of cape seals an...
Avaliação do dano em reforços de pavimentos
Minhoto, Manuel J. C.; Pais, Jorge C.Neste artigo apresenta-se uma simulação numérica do comportamento à reflexão de fendas num reforço de pavimento tendo como objectivo a avaliação do dano acumulado, ao longo de um período de tempo, considerando a ação conjunta das ações do tráfego e da temperatura, de modo a concluir sobre o seu comportamento. O estudo baseou-se no estabelecimento de situações tipo de evolução diária da temperatura do ar, para a...
The prediction of fatigue life of asphalt mixtures using four-point bending tests
Pais, Jorge C.; Minhoto, Manuel J. C.Fatigue resistance is used in the analysis and design of pavements to predict their life cycle. The results of fatigue tests are expressed in terms of the number of cycles for the tensile strain level applied. Two constants (k1 and k2) take part in this relationship. To know these two constants, at least two fatigue tests are needed, performed at different strain levels to obtain those constants. However, based...
Influência da temperatura no comportamento à reflexão de fendas das misturas be...
Minhoto, Manuel J. C.; Pais, Jorge C.Os pavimentos rodoviários estão sujeitos à acção combinada do tráfego e das variações de temperatura que os conduzem a diversos tipos de degradações, destacando-se o fendilhamento como uma das principais, constituindo uma preocupação dos organismos rodoviários atrasar ou, quando possível, evitar a ocorrência de fendilhamento nos pavimentos flexíveis. O reforço de pavimentos constitui uma técnica de conservação ...
Laboratory performance of asphalt rubber mixtures
Fontes, Liseane P. T. L.; Trichês, Glicério; Pais, Jorge C.; Pereira, Paulo A. A.; Minhoto, Manuel J. C.Asphalt rubber mixtures are one of the most promising techniques to extend the service of asphalt pavement overlays. Asphalt rubber binder is composed of crumb rubber from reclaimed tires and conventional asphalt. The asphalt rubber binder can be obtained through wet process in two different systems: tire rubber-modified asphalt binder (produced at industrial plants and continuous blending (produced in asphalt ...
The prediction of fatigue life using the k1-k2 relationship
Pais, Jorge C.; Pereira, Paulo A. A.; Minhoto, Manuel J. C.; Fontes, Liseane P. T. L.; Kumar, D. S. N. V. A.; Silva, B. T. A.Fatigue resistance is used in the analysis and design of pavements to predict their life cycle. It is evaluated through time consuming laboratory tests, mainly when performed at very low strain levels. At low strain levels the testing time can last more than one day. Due to the heterogeneity of the material, a large number of samples are tested during days or weeks. The results of fatigue tests are expressed in...
Application of plateau value to predict fatigue life
Pais, Jorge C.; Pereira, Paulo A. A.; Minhoto, Manuel J. C.; Fontes, L. P. T. L.; Kumar, D. S. N. V. A.; Silva, B. T. A.Fatigue resistance of asphalt mixtures represents an important parameter for pavement design. This fatigue resistance is calculated through laboratory tests which require some time depending on the strain level applied to the specimen. For very low strain levels, identical to the one installed in the pavement, one test may last more than one week depending on the testing frequency. The time needed for the devel...
Analysis of the variation in the fatigue life through four-point bending tests
Pais, Jorge C.; Fontes, Liseane P. T. L.; Pereira, Paulo A. A.; Minhoto, Manuel J. C.; Kumar, D. S. N. V. A.; Silva, B. T. A.The fatigue resistance of asphalt mixtures is calculated through laboratory tests which require some time depending on the strain level applied to the specimen. For very low strain levels, identical to the one installed in the pavement of this study, one test may last more than one week depending on the testing frequency. The time needed for the development of the fatigue law may last longer. The number of spec...
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