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Estudo do desempenho de misturas betuminosas para pavimentação com incorporação de betão britado reciclado
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| 53.6 MB | Adobe PDF |
Authors
Abstract(s)
O objetivo desta dissertação é estudar o desempenho de misturas betuminosas para
pavimentação com incorporação de betão britado reciclado proveniente de resíduos de
construção e demolição, para camadas de base. Em particular, pretende-se estudar o
fenómeno de interação do betume de pavimentação com agregados reciclados de betão
britado. Para isso, foi estudada uma mistura betuminosa com betão britado reciclado como
agregado, em substituição do agregado de origem natural, numa taxa de incorporação de 60%,
destinada a camadas de base (AC 20 base), e com um betume temperado 35/50 previamente
aditivado em refinaria.
O trabalho experimental consistiu primeiramente na caracterização geométrica e física
do agregado utilizado, de modo o completar a caracterização mecânica e química previamente
já disponível.
A formulação da mistura betuminosa baseou-se no método empírico muito utilizado em
Portugal, a metodologia Marshall.
Foram realizados ensaios experimentais de avaliação do desempenho da mistura
betuminosas e do seu comportamento em serviço, como o ensaio de sensibilidade à água,
resistência à deformação permanente, obtenção do módulo de rigidez e resistência à fadiga.
Os resultados obtidos dos ensaios são discutidos e comparados com trabalhos
anteriormente realizados, de modo a poderem ser retiradas as conclusões que respondem ao
objetivo inicialmente proposto.
Concluiu-se que, apesar de o betão britado reciclado não cumprir todos as
especificações relativas aos agregados para utilização em camadas de base de pavimentação,
a mistura betuminosa revelou globalmente um desempenho aceitável. O betão britado
reciclado mostrou-se assim um material com potencial para ser utilizado em misturas
betuminosas para pavimentação.
The purpose of this thesis is to study the performance of paving bituminous mixtures with incorporation of recycled crushed concrete from construction and demolition waste for asphalt base layers. In particular, we intend to study the phenomenon of interaction paving bitumen with recycled aggregates from crushed concrete. For that, bituminous mixtures were formulated with recycled crushed concrete as aggregate, in replacement of the natural origin aggregate in the amount of 60%, intended asphalt base layers (AC 20 base) and with a 35/50 warm bitumen. The experimental work began by the geometrical and physical characterization of the aggregates in order to complete the mechanical and chemical characterization previously available. In the formulation of the bituminous mixtures it was followed an empirical method widely used in Portugal designated by Marshall method. In order to analyze the feasibility of the incorporation of the recycled aggregated, there were performed experimental tests that revealed details about the performance of the bituminous mixtures and its in-service behavior, as the determination of the water sensitivity, the resistance to permanent deformation, the stiffness modulus and the resistance to fatigue. Throughout this thesis, they are described in detail the experimental procedures used. The results obtained from the experimental tests were discussed and compared to previously activities performed so that they can be drawn to conclusions that respond to the initial goal suggested. It is concluded that the recycled concrete does not meet all the specifications of the aggregates for use in base course layers paving. However, this type of recycled aggregate revealed a similar performance when compared to the natural aggregate in some tests. The recycled crushed concrete was determined as a material with potential for future use in bituminous mixtures.
The purpose of this thesis is to study the performance of paving bituminous mixtures with incorporation of recycled crushed concrete from construction and demolition waste for asphalt base layers. In particular, we intend to study the phenomenon of interaction paving bitumen with recycled aggregates from crushed concrete. For that, bituminous mixtures were formulated with recycled crushed concrete as aggregate, in replacement of the natural origin aggregate in the amount of 60%, intended asphalt base layers (AC 20 base) and with a 35/50 warm bitumen. The experimental work began by the geometrical and physical characterization of the aggregates in order to complete the mechanical and chemical characterization previously available. In the formulation of the bituminous mixtures it was followed an empirical method widely used in Portugal designated by Marshall method. In order to analyze the feasibility of the incorporation of the recycled aggregated, there were performed experimental tests that revealed details about the performance of the bituminous mixtures and its in-service behavior, as the determination of the water sensitivity, the resistance to permanent deformation, the stiffness modulus and the resistance to fatigue. Throughout this thesis, they are described in detail the experimental procedures used. The results obtained from the experimental tests were discussed and compared to previously activities performed so that they can be drawn to conclusions that respond to the initial goal suggested. It is concluded that the recycled concrete does not meet all the specifications of the aggregates for use in base course layers paving. However, this type of recycled aggregate revealed a similar performance when compared to the natural aggregate in some tests. The recycled crushed concrete was determined as a material with potential for future use in bituminous mixtures.
Description
Keywords
Pavimentos Rodoviários Misturas Betuminosas Temperadas Resíduos de Construção e Demolição Agregado Reciclado Betão Britado Ensaios de Desempenho