Efeitos da substituição parcial de cinza do bagaço de cana-de-açúcar na produção de blocos de alvenaria estrutural em escala reduzida (1:4)
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Data
2023-01-23
Autores
Berti, João Vitor Meneguetti
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Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho teve como objetivo a análise das propriedades mecânicas de peças de alvenaria estrutural contendo substituição parcial de cimento Portland comum por cinza do bagaço de cana-de-açúcar (CBC). A cinza foi obtida a partir do bagaço fornecido pela Usina Ipiranga situada na cidade de Mococa-SP. O bagaço foi queimado utilizando forno padrão desenvolvido pela UNESP – Ilha Solteira. A técnica de modelagem em escala reduzida foi utilizada como ferramenta para o estudo. A confecção dos blocos que compõem as peças de alvenaria foi feita a partir de uma prensa pneumática própria para blocos na escala (1:4). Os ensaios mecânicos foram realizados considerando resistência à compressão e absorção de blocos unitários, resistência à compressão de prismas e da argamassa utilizada no seu assentamento. Para se analisar a influência da CBC na mistura, foi variado seu teor em substituição de cimento nas porcentagens de 5, 10, 15, 25 e 50% nos blocos unitários e os resultados se mostraram satisfatórios. Os valores de resistência à compressão foram semelhantes para blocos contendo o resíduo em comparação ao traço controle, considerando que os testes foram realizados aos 7 dias de cura. Para o ensaio envolvendo prismas, foi analisado o traço contendo CBC que apresentou os melhores índices no ensaio de resistência à compressão dos blocos (porcentagem de 15%) em comparação ao traço controle. Os resultados se apresentaram condizentes com o comportamento dos blocos, bem como a relação entre as duas peças, que foi observada semelhante à observada na literatura. Por fim, foram discutidas algumas considerações acerca do uso de CBC em peças de alvenaria, que se mostrou benéfica, assim como a viabilidade do uso da modelagem em escala reduzida para a condução de pesquisas envolvendo o tema.
The main objective of this present paper was to analyze the mechanical properties of structural masonry components containing sugarcane bagasse ash (SBA) as partial replacement to cement. The ash was obtained from bagasse provided by Ipiranga Power Plant from the city of Mococa-SP and burnt in a standard furnace developed by UNESP–Ilha Solteira. The smallscale modeling technique was used as a tool for the research. A proper pneumatic press for low scaling (1:4) blocks was used to produce the masonry blocks. The mechanical properties were assessed considering compressive strength and absorption tests on block units, as well as compressive strength tests on masonry prisms and the mortar used on its laying. To analyze the CBC influence on masonry, its percentage as partial replacement to cement was varied in 5, 10, 15, 25 and 50% ratios on the units’ tests, which showed positive results. The compressive strength values were similar on the units containing the residue, in comparison to the standard mixture, considering its early ages (7 days of curing). For the masonry prisms, it was analyzed the mixture containing SBA that showed the best results on the compressive strength test of units (15% mix) and compared to the standard mixture. The test results were aligned with the unit’s behavior, along with the correlation between the two components, which was similar to the observed on the literature. At last, it was discussed some considerations regarding SBA usage on masonry components, that can be considered beneficial, as well as the application viability of small-scale modeling in masonry research.
The main objective of this present paper was to analyze the mechanical properties of structural masonry components containing sugarcane bagasse ash (SBA) as partial replacement to cement. The ash was obtained from bagasse provided by Ipiranga Power Plant from the city of Mococa-SP and burnt in a standard furnace developed by UNESP–Ilha Solteira. The smallscale modeling technique was used as a tool for the research. A proper pneumatic press for low scaling (1:4) blocks was used to produce the masonry blocks. The mechanical properties were assessed considering compressive strength and absorption tests on block units, as well as compressive strength tests on masonry prisms and the mortar used on its laying. To analyze the CBC influence on masonry, its percentage as partial replacement to cement was varied in 5, 10, 15, 25 and 50% ratios on the units’ tests, which showed positive results. The compressive strength values were similar on the units containing the residue, in comparison to the standard mixture, considering its early ages (7 days of curing). For the masonry prisms, it was analyzed the mixture containing SBA that showed the best results on the compressive strength test of units (15% mix) and compared to the standard mixture. The test results were aligned with the unit’s behavior, along with the correlation between the two components, which was similar to the observed on the literature. At last, it was discussed some considerations regarding SBA usage on masonry components, that can be considered beneficial, as well as the application viability of small-scale modeling in masonry research.
Descrição
Palavras-chave
Alvenaria estrutural, Propriedades mecânicas, Cinza do Bagaço de Cana-de-açúcar (CBC), Structural masonry, Mechanical properties, Sugarcane Bagasse Ash (SBA)