Estudo de traços de concreto permeável com adição de areia e sílica
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Data
2021-07-30
Autores
Bigotto, Sherington Augusto Milani
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Levando-se em consideração as situações atuais de drenagem urbana das cidades brasileiras o uso de concreto permeável para mitigar os problemas resultantes do mal gerenciamento do escoamento de água torna-se uma opção. Dessa forma, para analisar o comportamento do concreto permeável, produziu-se oito composições de concreto permeável, com três traços (1:3,5; 1:5,0; 1:6,5) para cada composição. Nessas variou-se a granulometria do agregado graúdo e adicionou-se areia e sílica às composições nas proporções de 5 e 10%. Dessa forma, foi possível verificar a influência do tamanho do agregado e da adição de materiais finos na resistência e no coeficiente de permeabilidade do concreto. A comparação dos resultados obtidos com mesmo traço, com agregados de tamanhos diferentes, demonstrou que, ao diminuir o diâmetro do agregado ganha-se resistência a compressão axial e perde-se coeficiente de permeabilidade. Além disso, em todos os traços estudados, ao adicionar materiais finos, esse comportamento se repete. No geral, os resultados de resistência e de coeficiente de permeabilidade obtidos com as adições de sílica foram superiores aos com adições de areia. Por fim, foi possível propor um diagrama de dosagem adaptado que permitiu de forma prática, determinar qual o traço mais adequado de acordo com a necessidade do projeto.
In the context of the current situations of urban drainage in Brazilian cities, the use of permeable concrete becomes an option to mitigate the problems resulting from poor management of water flow. To analyze the behavior of pervious concrete, 8 pervious concrete compositions were produced, with 3 distinct proportions (1:3,5; 1:5,0; 1:6,5) for each. In these compositions the granulometry of the coarse aggregate was varied and sand and silica were added to the compositions in the proportions of 5 and 10%. It was possible to verify the influence of the size of the aggregate and the addition of fine materials on the compressive strength and permeability coefficient of the pervious concrete. The comparison of the results obtained with the same mix with aggregates of different sizes showed that by decreasing the diameter of the aggregate, resistance to axial compression is gained and the permeability coefficient is lost. Furthermore, in all the studied mixtures when adding materials, this behavior is repeated. In general, the resistance and permeability coefficient results obtained with silica additions were superior to those with sand additions. Finally, it was proposed an adapted dosage diagram that can be used to identify the mixture that better adequate according to the needs of the project.
In the context of the current situations of urban drainage in Brazilian cities, the use of permeable concrete becomes an option to mitigate the problems resulting from poor management of water flow. To analyze the behavior of pervious concrete, 8 pervious concrete compositions were produced, with 3 distinct proportions (1:3,5; 1:5,0; 1:6,5) for each. In these compositions the granulometry of the coarse aggregate was varied and sand and silica were added to the compositions in the proportions of 5 and 10%. It was possible to verify the influence of the size of the aggregate and the addition of fine materials on the compressive strength and permeability coefficient of the pervious concrete. The comparison of the results obtained with the same mix with aggregates of different sizes showed that by decreasing the diameter of the aggregate, resistance to axial compression is gained and the permeability coefficient is lost. Furthermore, in all the studied mixtures when adding materials, this behavior is repeated. In general, the resistance and permeability coefficient results obtained with silica additions were superior to those with sand additions. Finally, it was proposed an adapted dosage diagram that can be used to identify the mixture that better adequate according to the needs of the project.
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Palavras-chave
Concreto permeável, Dosagem, Resistência Mecânica, Permeabilidade, Pervious concrete, Dosage, Mechanical strength, Permeability