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Abstract(s)
O presente artigo descreve a avaliação experimental de argamassas de revestimento com incorporação de agregados leves artificiais e reciclados. Foram utilizados agregados artificiais de argila expandida (LS) e agregados provenientes da reciclagem, nomeadamente, a cortiça natural (COR), a cortiça expandida (CEX) e o poliestireno expandido (EPS). Para servir de referência, produziu-se uma argamassa típica de revestimento com cimento Portland, cal hidratada e agregados naturais ao traço 1:1:5 em volume aparente seco. Para avaliar a influência dos agregados leves nas propriedades das argamassas, foram produzidas dezasseis misturas com o mesmo traço de 1:1:5 em volume aparente seco, mas substituindo a fração dos agregados naturais por cada um dos agregados leves (LS, CR, CEX e EPS) com as percentagens de substituição de 25%, 50%, 75% e 100%. As dosagens de água e de superplastificante foram ajustadas de modo que todas as argamassas apresentassem a mesma consistência no ensaio da mesa de espalhamento, compreendido entre 160 e 180 mm. Foram avaliadas as propriedades físicas e mecânicas das argamassas. Os resultados obtidos confirmaram a viabilidade da utilização de agregados leves como alternativa ou complementaridade aos agregados naturais. Em geral, as argamassas apresentaram bons desempenhos do ponto de vista físico e mecânico.
The present article describes the experimental evaluation of rendering mortars with the incorporation of artificial and recycled lightweight aggregates. Artificial aggregates of expanded clay (LS) and aggregates from recycling, namely, natural cork (COR), expanded cork (CEX) and expanded polystyrene (EPS) were used. A typical rendering mortar with Portland cement, hydrated lime and natural aggregates in the proportion of 1:1:5 in dry bulk volume was produced to be used as a reference. To evaluate the influence of the lightweight aggregates in the mortar properties, sixteen mixtures were produced with the same proportion in dry bulk volume of 1:1:5, but replacing the fraction of the natural aggregates by each of the lightweight aggregates (LS, COR, CEX and EPS) with the percentages of replacement of 25%, 50%, 75% and 100%. Dosages of water and superplasticizer were adjusted so that all mortars presented the same consistency in terms of flow table spread, between 160 and 180 mm. The physical and mechanical properties of the mortars were evaluated. The results confirmed the feasibility of using lightweight aggregates as an alternative or complement to natural aggregates. In general, the mortars have shown a good performance in the standpoint of physical and mechanical properties.
The present article describes the experimental evaluation of rendering mortars with the incorporation of artificial and recycled lightweight aggregates. Artificial aggregates of expanded clay (LS) and aggregates from recycling, namely, natural cork (COR), expanded cork (CEX) and expanded polystyrene (EPS) were used. A typical rendering mortar with Portland cement, hydrated lime and natural aggregates in the proportion of 1:1:5 in dry bulk volume was produced to be used as a reference. To evaluate the influence of the lightweight aggregates in the mortar properties, sixteen mixtures were produced with the same proportion in dry bulk volume of 1:1:5, but replacing the fraction of the natural aggregates by each of the lightweight aggregates (LS, COR, CEX and EPS) with the percentages of replacement of 25%, 50%, 75% and 100%. Dosages of water and superplasticizer were adjusted so that all mortars presented the same consistency in terms of flow table spread, between 160 and 180 mm. The physical and mechanical properties of the mortars were evaluated. The results confirmed the feasibility of using lightweight aggregates as an alternative or complement to natural aggregates. In general, the mortars have shown a good performance in the standpoint of physical and mechanical properties.
Description
Keywords
Argamassas Agregados leves Agregados reciclados Argila expandida Cortiça Poliestireno expandido Propriedades mecânicas Propriedades físicas Trabalhabilidade
Citation
Paula Alexandra Gil Barroca, Miguel Costa Santos Nepomuceno, Luiz Antonio Pereira de Oliveira, Avaliação do desempenho de argamassas de revestimento com agregados leves artificiais e reciclados, International Conference on Engineering: Engineering for Society (ICEUBI2015), Covilhã, Portugal, Dec. (2015). ISBN:978-989-654-261-0.