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Análise da Evolução de Resultados dos Recenseamentos Agrícolas de 1989, 1999 e ...
Fernandes, Luís; Minhoto, Manuel; Marques, FernandoOs três últimos Recenseamentos Agrícolas (RA) aconteceram em anos que permitem perceber os efeitos da PAC e respctivas Reformas na agricultura portuguesa: RA/1989 como cenário base da integração, RA/1999 com as consequências da Reforma 1992 e RA/2009 após aplicação da Reforma Intercalar 2003. Este trabalho pretende analisar alguns vetores da evolução da agricultura no território continental após adesão à CEE, t...
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 ...
Multi-cracks modeling in reflective cracking
Pais, Jorge C.; Minhoto, Manuel; 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, ManuelThis 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...
Avaliação do dano em reforços de pavimentos
Minhoto, Manuel; 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 dum período de tempo, considerando a acção conjunta das acções 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...
Asphalt rubber interlayer benefits on reflective crack retardation of flexible ...
Shakir, Shatnawi; Pais, Jorge; Minhoto, ManuelThis 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...
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...
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