Showing papers by "Hugo Manuel Ribeiro Dias da Silva published in 2013"

Incorporation of Waste Plastic in Asphalt Binders to Improve Their Performance in the Pavement

Abstract: With the increase in road traffic more demands are placed on pavements, and thus the structural and functional performance of road pavements needs to be improved. One method that can greatly improve the quality of the flexible pavements is the addition of polymers to the bitumen or to the asphalt mixtures. Although the modification of bitumen with virgin polymers can improve the properties of asphalt mixtures, the use of recycled plastic may also show a similar result with additional environmental advantages. This work aims to evaluate the possible advantages of modifying the bitumen with different plastic wastes, namely polyethylene (high density HDPE and low density LDPE), ethylene-vinyl acetate (EVA), acrylonitrile-butadiene-styrene (ABS) and crumb rubber, in order to improve the properties of the resulting binders for use in high performance asphalt mixtures. The performance of modified binders with recycled polymers was compared with that of the conventional bitumen and the one of a commercial modified binder (Styrelf). The results of the laboratory tests (basic characterization, dynamic viscosity, resilience and storage stability) will be used in the selection of the best plastic waste materials and production conditions that should be used in the modification of bitumen in order to optimize its behaviour, emphasizing that this study aims to promote the reuse of plastic waste in a more environmental and economic way.

Pushing the Asphalt Recycling Technology to the Limit

Abstract: 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 the present study, the utilization of a used motor oil as a rejuvenator was evaluated. This would allow the aged binder to restore some of its original properties, thus promoting an adequate performance of the mixture. After studying the RAP moisture content, the optimal amount of oil was determined by conventional bitumen tests, using the penetration grade as the selection criterion. Then, the binder was evaluated through rheological testing, and laboratory specimens were prepared and tested for water sensitivity, permanent deformation, stiffness and fatigue, in order to confirm that the totally recycled mixture will perform as good as a conventional mixture used for comparison purposes.

Development of an Innovative Bio-Binder Using Asphalt-Rubber Technology

Abstract: This research work evaluates several parameters that can affect Asphalt Rubber (AR) binder performance and applies the AR technology to the development of an innovative renewable bio-binder that can fully and cost-effectively replace asphaltic bitumen derived from petroleum in flexible pavement construction. The ”Binder Accelerated Separator” method was used to divide the constituents of the Asphalt Rubber and bio-binder (residual binder and swelled rubber). The physical and chemical changes in the Asphalt Rubber and bio-binder and in the residual binders (residual bitumen and residual bio-oil) were evaluated. The results demonstrate that the produced bio-binder is suitable for use in flexible pavements with properties comparable to those of conventional and Asphalt Rubber binders.

Solutions to improve the recycling rate and quality of plant produced hot mix asphalt

Abstract: Funded by QREN, in the scope of the project Energy Efficiency and Environmental Design of Bituminous Mixtures and Reducing Emissions of Greenhouse Gases (QREN-SI 090528)

Combining Asphalt T-Rubber (AR) and Fast-Pyrolysis Bio-Oil to Create a Binder for Flexible Pavements

Abstract: 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 milling was used to modify the bio-oil Then, a blend was produced by adding 20% (w/w) of this bio-binder to a PG 64-22 asphalt The resulting binder was aged, and the storage stability test (separation sensibility) was performed The initial GTR, bio-oil, bio-binder, asphalt and resulting binder were tested by means of Fourier Transform Infrared Spectroscopy (FTIR) before and after aging The Dynamic Shear Rheometer (DSR) was used to build the master curves of all the materials and the binders high temperature continuous performance grade was determined Two mixes compacted for 4% and 7% air voids were studied in regard to water susceptibility, fatigue cracking, dynamic modulus, flow number and low temperature fracture resistance The results showed that this binder can perform as well or better than conventional asphalts over a large range of temperatures

Formulação e caracterização de ligantes numa mistura betuminosa com uma taxa de reciclagem elevada

Abstract: Financiado por Fundos FEDER atraves do Programa Operacional Fatores de Competitividade – COMPETE e por Fundos Nacionais atraves da FCT – Fundacao para a Ciencia e a Tecnologia no âmbito do projeto “PLASTIROADS” PTDC/ECM/119179/2010 e do Projeto Estrategico UI 4047 – 2011-2012.

Estudo de material fresado para incorporação em misturas betuminosas a quente com altas taxas de reciclagem

Abstract: Fundos FEDER atraves do QREN e do Programa Operacional Fatores de Competitividade – COMPETE, projeto n.7603 SI Inovacao.

Avaliação da influência da camada de desgaste na sustentabilidade dos pavimentos rodoviários

Abstract: Financiado por fundos FEDER atraves do Programa Operacional de Competitividade - COMPETE e por fundos nacionais atraves da FCT - Fundacao para a Ciencia e a Tecnologia - no âmbito do Projeto PLASTIROADS - PTDC/ECM/119179/2010 e do Projeto Estrategico - UI 4047 - 2011-2012

Valorização de materiais reciclados na produção de betumes modificados para pavimentos

Abstract: Fundos FEDER atraves do Programa Operacional Fatores de Competitividade – COMPETE e por Fundos Nacionais atraves da FCT – Fundacao para a Ciencia e a Tecnologia no âmbito do projeto PLASTIROADS (PTDC/ECM/119179/2010) e do projeto estrategico UI 4047 – 2011-2012.

The role of rejuvenating agents in the recycling of asphalt mixtures

Abstract: QREN, in the scope of the project Energy Efficiency and Environmental Design of Bituminous Mixtures and Reducing Emissions of Greenhouse Gases (QREN-SI 090528)

Valorização de resíduos plásticos na modificação de betumes para pavimentos rodoviários

Abstract: Financiado por Fundos FEDER atraves do Programa Operacional Fatores de Competitividade – COMPETE e por Fundos Nacionais atraves da FCT – Fundacao para a Ciencia e a Tecnologia no âmbito do projeto PLASTIROADS (PTDC/ECM/119179/2010) e do projeto estrategico UI 4047 – 2011-2012.

Development of a novel modified bitumen with waste materials

Abstract: FEDER funds through the Competitiveness Factors Operational Programme (COMPETE) and by national funds through the Portuguese Foundation for Science and Technology (FCT) in the scope of the PLASTIROAD Project (PTDC/ECM/119179/2010) and the Strategic Project UI 4047 – 2011-2012