107 documents found, page 1 of 11
Developing enhanced modified bitumens with waste engine oil products combined w...
Fernandes, Sara Raquel Marques; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, JoelThe reduction in the use of natural and finite resources and the reuse of waste materials are current concerns of different research areas. Therefore, the main aim of this study is to develop enhanced modified bitumens with waste engine oil and recycled engine oil bottoms combined with polymers (waste polyethylene, crumb rubber and styrene-butadienestyrene), in order to minimize the use of bitumen. After a ther...
Analysis of foundry sand for incorporation in asphalt mixtures
Nascimento, L. P.; Oliveira, Joel; Vilarinho, CândidaWith the need to preserve natural resources, waste recovery and recycling are fundamental. However, it is essential to evaluate and characterize the wastes for a correct management namely by incorporation in industrial processes in order to avoid negative impacts. Foundry sand is a waste that can be reused as an aggregate and incorporated in asphalt mixtures. In this work, a mix design study of one asphalt mixt...
Obtenção das leis coesivas em modo misto de adesivos estruturais em função da e...
Oliveira, JoelA utilização dos adesivos em construções industriais tem vindo nos últimos anos a aumentar em larga escala, em substituição dos métodos tradicionais como a soldadura, brasagem, e ligações mecânicas como aparafusamentos e rebitagens. Esta tendência verifica-se devido às elevadas vantagens que este tipo de ligação oferece, dos quais se destacam a leveza, o bom comportamento sob cargas cíclicas ou fadiga, e sem dú...
Improving asphalt mixture performance by partially replacing bitumen with waste...
Fernandes, Sara Raquel Marques; Peralta, Joana; Oliveira, Joel; Williams, R. Christopher; Silva, Hugo Manuel Ribeiro Dias daThe environmental concern about waste generation and the gradual decrease of oil reserves has led the way to finding new waste materials that may partially replace the bitumens used in the road paving industry. Used motor oil from vehicles is a waste product that could answer that demand, but it can also drastically reduce the viscosity, increasing the asphalt mixture?s rutting potential. Therefore, polymer mod...
Suitability of different foamed bitumens for warm mix asphalts with increasing ...
Abreu, L. P. F.; Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias da; Palha, D.; Fonseca, P. V.Due to the current need for more sustainable production processes and construction materials, foamed bitumen has become one of the most interesting solutions for asphalt paving works, both for new (warm mix) and recycled asphalt mixtures (warm recycled mix). However, significant work still needs to be carried out in order to fully understand the performance of foamed bitumens, and their adequacy for incorporati...
A new life for cross-linked plastic waste as aggregates and binder modifier for...
Costa, Liliana Marisa Barros; Peralta, Joana; Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias daEvery year, millions of tons of plastic waste, with potential to be reused, are wasted in landfills. Based on a literature review and in a local market analysis, cross-linked polyethylene (PEX) waste arose as the material with the greatest potential to be tested for incorporation in asphalt mixtures due to the difficulty in its recycling and the lack of solutions for its reuse. Thus, in the present work, mixtur...
Coordination of user and agency costs using two-level approach for pavement man...
Moreira, André Vilaça; Fwa, Tien F.; Oliveira, Joel; Costa, L.Pavement maintenance and rehabilitation programming requires the consideration of conflicting objectives in order to optimize its life-cycle costs. While there are several approaches to solve multi-objective problems for pavement management systems, when user costs or environmental impacts are considered, the optimal solutions are often unpractical to be accepted by road agencies, given the dominating share of ...
Asphalt surface mixtures with improved performance using waste polymers via dry...
Ranieri, Mauro; Costa, Liliana; Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias da; Celauro, ClaraThe mechanical performance of a typical surface course mixture, modified with two different plastic wastes, both via the wet and dry processes, was evaluated in this study. Water sensitivity, rutting resistance, stiffness modulus, and fatigue cracking resistance tests were used. The results obtained indicated that the polymer-modified mixtures showed similar or improved performance when compared with that of a ...
Study of the interaction between asphalt and recycled plastics in new polymer m...
Costa, Liliana; Fernandes, Sara; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, JoelThe aim of this study is evaluating the interaction between several base pen grade asphalt binders (35/50, 50/70, 70/100, 160/220) and two different recycled plastics (EVA and HDPE), for a set of new polymer modified binders produced with different amounts of both recycled plastics. After analysing the results obtained for the several polymer modified binders evaluated in this study, including a commercial modi...
Foamed bitumen: an alternative way of producing asphalt mixtures
Abreu, Liliana Patrícia Ferreira; Oliveira, Joel; Silva, Hugo Manuel Ribeiro Dias da; Silva, Catarina; Palha, Daniela; Fonseca, PauloWith the constant need to improve and make the production of asphalt mixtures more sustainable, new production techniques have been developed, the implementation of which implies the correct knowledge of their performance. One of the most promising asphalt production techniques is the use of foamed bitumen. However, it is essential to understand how this binder will behave when subject to the expansion process....