Encontrados 33 documentos, a visualizar página 1 de 4
Utilização de nanopartículas de TIO2 para o desenvolvimento de pavimentos rodov...
Carneiro, Joaquim A. O.; Freitas, Elisabete F.; Teixeira, Vasco M. P.; Fernandes, Filipa; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, Joel; Nunes, C.A utilização de nanomateriais na indústria de construção rodoviária representa uma opção estrategicamente inovadora que visa a modificação dos materiais convencionais. Neste âmbito, dotar a superfície dos pavimentos rodoviários de capacidade fotocatalítica contribuirá para efetuar a despoluição do ar e a redução da sujidade adsorvida nestas superfícies, aumentando a segurança rodoviária uma vez que minimiza a p...
Combining asphalt-rubber (AR) and fast-pyrolysis bio-oil to create a binder for...
Peralta, J.; Williams, R. Christopher; Silva, Hugo Manuel Ribeiro Dias da; Machado, A. V.Best paper award of the conference ; The bio-oil from fast pyrolysis is mainly a product of the recycling of waste materials. This is a viscoelastic material, and after a heat treatment it has a viscosity similar to many types of asphalt used in the paving industry. Although bio-oil showed very good high temperature performance, the same was not verified at low temperatures. Therefore, GTR from cryogenic milli...
Valorização de resíduos plásticos na modificação de betumes para pavimentos rod...
Costa, Liliana; Fernandes, Sara R. M.; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, JoelCom o aumento do tráfego rodoviário são colocadas maiores exigências aos pavimentos, surgindo a necessidade de melhorar o seu desempenho. Um método que pode melhorar significativamente a qualidade dos pavimentos flexíveis é a adição de polímeros aos ligantes/misturas betuminosas. Assim, foram produzidos ligantes modificados com polímeros reciclados, em diferentes condições, cujo desempenho foi comparado com o d...
Estudo de material fresado para incorporação em misturas betuminosas a quente c...
Fonseca, Paulo; Guimarães, Carla; Gomes, Vitor; Palha, Daniela; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, Joel; Abreu, LilianaA problemática da reciclagem tem-se tornado cada vez mais importante no desenvolvimento dos países, pois a necessidade de tratar os resíduos gerados é essencial para a sobrevivência da Sociedade. Este trabalho visa estudar a forma como o tratamento dado ao material fresado pode condicionar as suas propriedades (granulometria e características do betume) e as condições de produção das misturas. Assim, tendo por ...
Development of a rubber-modified fractionated bio-oil for use as noncrude petro...
Peralta, J.; Williams, R. Christopher; Rover, Marjori; Silva, Hugo Manuel Ribeiro Dias daThe increasing demand for petroleum-derived products coupled with decreasing world crude reserves has led to substantial increases in asphalt pricing. Society’s additional interest in energy independence and use of renewable sources of energy is also a motivation for developing and using more sustainable materials such as binders derived from noncrude petroleum sources for use in highway applications. Iowa Stat...
Waste polymers recycling in high performance asphalt mixtures
Silva, Hugo Manuel Ribeiro Dias da; Machado, A. V.; Oliveira, Joel; Costa, L. M. B.Building a road pavement requires large amounts of constituent materials, whose extraction can lead to the devastation of natural resources and causes negative impacts on the environment. As aggregates comprise nearly 90% of asphalt mixtures, their partial substitution by waste thermosetting polymers (12 million tons of waste polymers are presently mislaid into landfills, every year, in Europe) can be considere...
Asphalt mixtures produced with 100% reclaimed materials
Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias da; Jesus, Carlos M. G.The environmental and economic benefits of using Reclaimed Asphalt Pavement (RAP) material in hot mix asphalt (HMA) applications could be pushed up to the limit, by producing totally recycled HMAs (100% RAP), but the performance of this alternative must be satisfactory. In fact, these mixtures could possibly present a lower performance due to the behaviour of the aged binder, which loses its lighter fractions w...
Monitoring rubber swelling and de- and re-vulcanization through AR elastic reco...
Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Pais, Jorge C.; Machado, A. V.Healthy economies require an appropriate transportation system, in which roadways are an essential part. Therefore, the construction and maintenance of road pavements should be long lasting and have a significant impact on the economic vitality of a nation. The elastic recovery is a property characteristic of the elastomers, or binders modified with those polymers, being used to classify them and especially to ...
New experimental methods to monitor and characterize asphalt rubber binders
Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Pais, Jorge C.The need for continuous quality improvement of the road pavements, leads to the development of new binders, such as asphalt rubber (AR). AR is produced by the digestion of crumb rubber from used tires on bitumen. The resulting AR is a heterogeneous material with high viscosity. The study of this product during its production is essential due to the sudden and sharp increase in the volume of AR in this phase. Kn...
Changes in the rubber morphology caused by the interaction with bitumen
Peralta, J.; Silva, Hugo Manuel Ribeiro Dias da; Pais, Jorge C.; Machado, A. V.It is estimated that about 10 kg of tires are discarded per inhabitant annually. This residue can be reused as a constituent of pavements in the form of asphalt rubber (AR) binder. The use of bitumen modified with crumb rubber contributes for a sustainable development of road infrastructures through: (i) the definition of an efficient final destination for the used tires of cars and trucks; (ii) the improvement...
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