Estudo do colapso de misturas solo, fosfogesso e bentonita visando o uso em camada de barreira hudráulica
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Data
2023-06-23
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Universidade Federal de Goiás
Resumo
The use of phosphogypsum and bentonite in tropical soils stabilization, aiming
at the use in hydraulic barriers, has been studied, and the results of permeability,
compatibility and resistance have been promising, but there are no studies about collapse
potential of these materials. Therefore, the objective of this study is to verify the collapse
potential of tropical soil, phosphogypsum and bentonite mixtures for application in
hydraulic barriers. In order to get it, double oedometric tests were carried out in compacted
samples at optimum water content on soil’s samples, soil+phosphopgypsum,
soil+phosphopgypsum+bentonite (6%) and soil+phosphosgypsum+bentonite (9%).
Chemical dispersion tests were carried out with water, NaCl, NaOH, alcohol and HNO3,
representing scenarios of contamination by solutions acidic, basic, salts and alcohols. The
results of the oedometric tests show that the soil and the mixtures have not collapsed. In
addition, the mixtures studied showed similar and smaller deformations when compared
to other types of recycled materials. The dispersion test showed that the addition of
chemical stabilizers reduces the dispersion of particles in aqueous medium. No significant
structural changes were observed in samples flooded with NaCl and ethanol solutions.
However, under NaOH and HNO3 flood conditions, the mixtures do not perform
satisfactorily. Therefore, the use of these mixtures in hydraulic barriers is not
recommended when the percolating fluid is an acid or base, especially in the presence of
sodium.
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Palavras-chave
Bentonita, Barreira hidráulica, Colapso, Dispersão, Fosfogesso, Bentonite, Hydraulic barrier, Collapse, Dispersion, Phosphogypsum
Citação
LIMA JUNIOR, João Carneiro de et al. Estudo do colapso de misturas solo, fosfogesso e bentonita visando o uso em camada de barreira hudráulica. REEC - Revista Eletrônica de Engenharia Civil, Goiânia, v. 19, n. 1, p. 167-179, 2023. Disponível em: https://revistas.ufg.br/reec/article/view/167-179/39933. Acesso em: 07 ago. 2023.