Traffic noise is an important branch of the environment pollution which deeply affects the population and for that reason it has been included in the set of pavement performance indicators. Nevertheless, the knowledge on the environmental impact of the existing surface pavement layers is very limited, particularly for what respects to tyre/road noise of thin layers. These layers are at the present time widely u...
A irregularidade longitudinal, caracterizada habitualmente pelo Índice Internacional de Irregularidade (IRI – International Roughness Index), é um dos parâmetros de estado dos pavimentos rodoviários cuja variabilidade pode ter consequências relevantes nas estratégias de reabilitação e, consequentemente, nos custos e na sua vida de serviço. Por esta razão, este artigo tem por principal objectivo proporcionar às ...
In the last decade, quality control of asphalt mixtures for pavement construction on the main Portuguese national road network used, most of the time, four-point bending beam tests (4pb) results as a reference. Stiffness modulus and fatigue laws established with samples prepared in the laboratory are usually used as a reference for behaviour/quality control analysis of the samples coming from the construction s...
Texture is a surface characteristic which has a very wide influence on pavements functional quality. It is currently assessed by a number of test methods. Road Administrations face the problems of dealing with data acquired by different methods and, in addition to that, the repeatability and reproducibility of the results. This paper presents an analysis of test methods used for texture depth evaluation in Port...
Uma das consequências do desenvolvimento económico verificado nas últimas décadas é o aumento significativo do tráfego rodoviário. O ruído induzido pelo tráfego é um importante factor de poluição ambiental que afecta cada vez um maior número de pessoas. Nesta comunicação efectua-se a comparação do nível de ruído (Lmax) registado para os veículos ligeiros, e pesados, de acordo com o método estatístico de passage...
Three cases of tuberculosis (TB), paradigmatic of the current situation are presented. The world TB situation is described, according to the latest figures from WHO: There is a reduction in Europe and the American regions and an increase more marked in South East Asia, followed closely by the Western Pacific and the African regions. The global increase in cases was 21%. Future perspectives are drawn and the WHO...
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