Incorporação de vidro reciclado em betões : análise da influência do processo de amassadura no agregado reciclado de vidro
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Data
2016
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Resumo
O vidro é um dos produtos utilizados na construção, pelo que a sustentabilidade
desta indústria passa pela reciclagem e reutilização deste material. Uma das grandes
dificuldades da reciclagem do vidro é a sua separação, pois, para manter as suas
características e qualidades para a fabricação de novos objetos de vidro, este terá de ser
separado por cores. Por esta razão, apesar de uma grande consciencialização da
população para a reciclagem, torna-se importante encontrar outras soluções sustentáveis
para o uso do vidro que não pode ser reciclado noutras aplicações. Depois de muitos
autores terem estudado a viabilidade do uso do vidro como agregado em betões, surgiu
a necessidade de analisar a influência do processo de amassadura nas características do
agregado reciclado de vidro para, em trabalhos futuros, haver uma perceção do seu
desgaste e avaliar as consequências resultantes da sua adição como agregado em betões.
No presente estudo, foi analisada a ação da misturadora, durante a amassadura,
sobre a granulometria do agregado de vidro. Assim, os agregados foram colocados
numa misturadora, tendo-se posteriormente simulado o processo de amassadura
mecânico. Numa primeira fase, foram usados apenas os agregados reciclados de vidro;
numa segunda fase, foram utilizados só os agregados naturais britados e, numa terceira
fase, utilizaram-se os dois tipos de agregados em conjunto. Para verificar as alterações
no desempenho mecânico provocadas pela misturadora, comparativamente com a
mistura manual, foram fabricados betões com uma taxa de substituição, em volume, de
25 % e 50 % do agregado natural britado pelo agregado reciclado de vidro.
Depois da realização do trabalho experimental, verificou-se que, apesar de haver
uma alteração granulométrica por parte do agregado reciclado de vidro, esta não
influencia significativamente a resistência do betão.
Glass is one of the products used in construction, therefore it is very important to reuse it for the sustainability of this industry. One of the major challenges in glass recycling is its separation because, in order to maintain its characteristics and qualities to produce new glass objects glass must be separated according to its colour. For this reason, and in spite of a high population awareness of recycling, it is important to find other sustainable solutions for the use of that glass that can’t be recycled for other applications. After many studies on the feasibility of using glass as an aggregate in concrete, there arose the need of analyzing the influence of the mixing process in the recycled glass aggregate in order to have the perception of its wear and to evaluate the resulting consequences of its addition as an aggregate in concrete, in future studies. In this study, we analyzed the action of the mixer, while mixing, onto the glass aggregate grading. Thus, the aggregates were placed in a mixer and subsequently the mechanical mixing process was simulated. Initially, only the glass of recycled aggregates was used; in a second stage, the crushed natural aggregates were used; And finally in a third stage, two types of aggregates were used together. In order to verify the changes occurred in the mechanical performance caused by the mixer, in comparison with the manual mixing, the concrete was produced with a replacement rate in volume of 25 % and 50 % of the natural aggregate crushed by the glass recycled aggregate. After the experimental work was over, we came to the conclusion that, despite the occurrence of a change in the particle size of the recycled glass aggregate, this one does not influence the concrete resistance significantly.
Glass is one of the products used in construction, therefore it is very important to reuse it for the sustainability of this industry. One of the major challenges in glass recycling is its separation because, in order to maintain its characteristics and qualities to produce new glass objects glass must be separated according to its colour. For this reason, and in spite of a high population awareness of recycling, it is important to find other sustainable solutions for the use of that glass that can’t be recycled for other applications. After many studies on the feasibility of using glass as an aggregate in concrete, there arose the need of analyzing the influence of the mixing process in the recycled glass aggregate in order to have the perception of its wear and to evaluate the resulting consequences of its addition as an aggregate in concrete, in future studies. In this study, we analyzed the action of the mixer, while mixing, onto the glass aggregate grading. Thus, the aggregates were placed in a mixer and subsequently the mechanical mixing process was simulated. Initially, only the glass of recycled aggregates was used; in a second stage, the crushed natural aggregates were used; And finally in a third stage, two types of aggregates were used together. In order to verify the changes occurred in the mechanical performance caused by the mixer, in comparison with the manual mixing, the concrete was produced with a replacement rate in volume of 25 % and 50 % of the natural aggregate crushed by the glass recycled aggregate. After the experimental work was over, we came to the conclusion that, despite the occurrence of a change in the particle size of the recycled glass aggregate, this one does not influence the concrete resistance significantly.
Descrição
Orientação: Felicita Maria Guerreiro Pires ; co-orientação: Manuel Gomes Vieira
Palavras-chave
MESTRADO EM ENGENHARIA CIVIL, ENGENHARIA CIVIL, MATERIAIS DE CONSTRUÇÃO, VIDRO, BETÃO, CIVIL ENGINEERING, BUILDING MATERIALS, GLASS, CONCRETE