Loading...
Publication
Estudo de Argamassas com Cinza de Casca de AmĂȘndoa
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 4.99 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Perante o elevado consumo de materiais naturais no processo e produtos na ĂĄrea da
construção civil, o reaproveitamento de resĂduos Ă© uma das soluçÔes a ser estudada. As
cinzas agroindustriais tĂȘm lugar de destaque entre estes resĂduos, pois tĂȘm a possibilidade
de aplicação em materiais cimentĂcios, reduzindo assim o consumo de cimento de Portland.
O presente estudo debruça-se sobre a substituição parcial (1,5% e 5%) de cimento de
Portland por cinzas de casca de amĂȘndoa. Realizaram-se provetes com diferentes tipos de
argamassas: (i) uma de controlo sem substituição de cimento (ARF); (ii) uma com 1,5% de
substituição parcial de cimento por cinzas de casca de amĂȘndoa (CCA 1,5%); (iii) e uma
com 5% de substituição parcial de cimento por cinza de casca de amĂȘndoa (CCA 5%).
Executaram-se ensaios para resistĂȘncias mecĂąnicas aos 3, 7, 14, 28 e 41 dias de idade. A
nĂvel quĂmico pode-se concluir que esta cinza de casca de amĂȘndoa nĂŁo apresentou qualquer
potencial pozolĂąnico. A trabalhabilidade na generalidade diminui ligeiramente, contendo
cinza de casca de amĂȘndoa, mas ainda assim considerando-se de fĂĄcil manuseamento. Em
relação Ă s resistĂȘncias mecĂąnicas, pode-se concluir que o ideal Ă© a substituição parcial de
cimento com 1,5%, pois as resistĂȘncias diminuem com o uso de uma maior percentagem de
substituição, ou seja, o ideal é substituir em pequenas percentagens. Com os dados obtidos,
conclui-se que as cinzas testadas nĂŁo apresentam caracterĂsticas necessĂĄrias para serem
consideradas pozolanas e se serå viåvel a sua utilização mesmo como filer.
Given the high consumption of natural materials in the process and products, in the construction area field, the reuse of waste is one of the solutions being studied. The agro industrial ashes are highlighted among these residues, as they have the possibility of applying on cementitious materials, and hence reducing the Portland cement consumption. The present study focuses on the partial substitution (1.5% to 5%) of Portland cement per almond husk ash. Samples were used with different types of grout: (i) a control without cement substitution (ARF); (ii) one with 1.5% partial replacement of cement per almond husk ash (CCA 1.5%); (iii) and one with 5% partial replacement of cement by almond husk ash (CCA 5%). Tests were executed for mechanical strength at 3, 7, 14, 28 and 41 days of age. In a chemical level perspective it can be concluded that this almond husk ash showed no pozzolanic potential. Overall, the workability slightly decreased, containing almond husk ash, but still considering easy to handle. With regard to mechanical strength, it can be concluded that the ideal is the partial replacement of cement with 1.5% because the resistance decreased with the use of a higher percentage of substitution. That is, the ideal is to replace in small percentages. It can be concluded that the tested ashes do not present characteristics necessary to be considered pozzolan and the feasibility of its use even as filer.
Given the high consumption of natural materials in the process and products, in the construction area field, the reuse of waste is one of the solutions being studied. The agro industrial ashes are highlighted among these residues, as they have the possibility of applying on cementitious materials, and hence reducing the Portland cement consumption. The present study focuses on the partial substitution (1.5% to 5%) of Portland cement per almond husk ash. Samples were used with different types of grout: (i) a control without cement substitution (ARF); (ii) one with 1.5% partial replacement of cement per almond husk ash (CCA 1.5%); (iii) and one with 5% partial replacement of cement by almond husk ash (CCA 5%). Tests were executed for mechanical strength at 3, 7, 14, 28 and 41 days of age. In a chemical level perspective it can be concluded that this almond husk ash showed no pozzolanic potential. Overall, the workability slightly decreased, containing almond husk ash, but still considering easy to handle. With regard to mechanical strength, it can be concluded that the ideal is the partial replacement of cement with 1.5% because the resistance decreased with the use of a higher percentage of substitution. That is, the ideal is to replace in small percentages. It can be concluded that the tested ashes do not present characteristics necessary to be considered pozzolan and the feasibility of its use even as filer.
Description
Keywords
Cinza de casca de amĂȘndoa Argamassa ResistĂȘncia Almond husk ash Grout Resistance