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Abstract(s)
No âmbito da produção de misturas betuminosas, a redução da temperatura de produção aliada com a reciclagem de pavimentos resulta numa tecnologia bastante sustentável e promissora. Ao seguir este raciocínio tem-se uma mistura betuminosa reciclada temperada, ou seja, uma mistura mais sustentável e menos poluente. Este tipo de misturas apresenta vantagens a nível social, ambiental e económico. Destacando-se a redução da emissão de gases de efeito de estufa e do consumo de energia e a melhoria das condições de trabalho.
O presente estudo pretende validar a metodologia de formulação de misturas betuminosa recicladas temperadas desenvolvida por Dinis-Almeida na sua Tese de Doutoramento. Esta metodologia baseia-se no módulo de rigidez por tração indireta em compressão diametral para determinar o teor ótimo de ligante da mistura final. Para confirmação do teor ótimo de ligante foram realizados os seguintes ensaios de desempenho: resistência à deformação permanente, resistência à fadiga e sensibilidade à água).
No presente trabalho é feita uma descrição da evolução das misturas betuminosas e uma breve apresentação das principais técnicas de reciclagem de pavimentos, dando ênfase à reciclagem em central temperada com emulsão e à reciclagem in situ com emulsão betuminosa. Posteriormente apresentam-se os métodos de formulação existentes para as diversas misturas betuminosas, seguindo-se a descrição e avaliação da metodologia de formulação usada. Neste ponto será descrita toda a componente prática realizada: produção das misturas betuminosas com diferentes teores de emulsão betuminosa, determinação do teor ótimo de ligante através do módulo de rigidez por tração indireta e confirmação deste valor através dos ensaios de avaliação de desempenho.
Por fim, serão discutidas as principais conclusões do trabalho e feitas algumas propostas para trabalhos futuros. Considera-se que a metodologia de formulação é válida e que fornece resultados seguros e concisos bem como que as misturas com incorporação de material fresado até uma taxa de 100% possuem um bom desempenho.
In the context of the production of bituminous mixtures, the reduction of the production temperature combined with pavement recycling results in a very sustainable and promising technology. Following this idea it was obtained warm mix recycled asphalt, in other words a mixture more sustainable and cleaner. Such type of mixtures has social, environmental and economic benefits. Highlighting the emission reduction of greenhouse gases, the energy consumption reduction and improvement of working conditions. The present study aims to assess the design method of warm mix recycled asphalt developed by Dinis-Almeida in her PhD thesis. This methodology is based on stiffness modulus by indirect tensile in diametrical compression to determine the optimum binder content of the final mixture. For confirmation of the optimum binder content tests were conducted the following performance tests: resistance to permanent deformation, resistance to fatigue and water sensitivity. This work describes the evolution of bituminous mixtures and presents some of the main technologies for pavements recycling, focusing on warm recycling with bitumen emulsion in plant and “recycling in situ” with bitumen emulsion. It was presented the existing design method for the several bituminous mixtures, followed by the description and review of the design methodology used. At this point, will be describing all practical components that are concerning the bituminous mixtures production with different amounts of bitumen emulsion, determining the optimum binder content through the stiffness modulus by indirect tensile and the confirmation of this value through the performance evaluation tests. Finally, will be discussing the main conclusions of the work and presented some proposals for future work. Finally it is considered that the design method is valid and provides reliable and concise results as well as the mixtures with reclaimed asphalt pavement to a rate of 100 % have a good performance.
In the context of the production of bituminous mixtures, the reduction of the production temperature combined with pavement recycling results in a very sustainable and promising technology. Following this idea it was obtained warm mix recycled asphalt, in other words a mixture more sustainable and cleaner. Such type of mixtures has social, environmental and economic benefits. Highlighting the emission reduction of greenhouse gases, the energy consumption reduction and improvement of working conditions. The present study aims to assess the design method of warm mix recycled asphalt developed by Dinis-Almeida in her PhD thesis. This methodology is based on stiffness modulus by indirect tensile in diametrical compression to determine the optimum binder content of the final mixture. For confirmation of the optimum binder content tests were conducted the following performance tests: resistance to permanent deformation, resistance to fatigue and water sensitivity. This work describes the evolution of bituminous mixtures and presents some of the main technologies for pavements recycling, focusing on warm recycling with bitumen emulsion in plant and “recycling in situ” with bitumen emulsion. It was presented the existing design method for the several bituminous mixtures, followed by the description and review of the design methodology used. At this point, will be describing all practical components that are concerning the bituminous mixtures production with different amounts of bitumen emulsion, determining the optimum binder content through the stiffness modulus by indirect tensile and the confirmation of this value through the performance evaluation tests. Finally, will be discussing the main conclusions of the work and presented some proposals for future work. Finally it is considered that the design method is valid and provides reliable and concise results as well as the mixtures with reclaimed asphalt pavement to a rate of 100 % have a good performance.
Description
Keywords
Misturas betuminosas Misturas betuminosas temperadas Misturas betuminosas temperadas - Avaliação de desempenho Material fresado