2020
DOI: 10.1016/j.heliyon.2020.e03462
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Effect of cations and anions on flocculation of dispersive clayey soils

Abstract: Dispersivity of clay soils is one of the most important issues that should be considered in civil engineering projects. Dispersive soils are clay soils that are easily washed in water with low concentrations of salt; these clay soils usually contain high levels of sodium ions in their adsorption cation sites. Kaolin, sepiolite (fibrous clay), and bentonite soils are among the most important and useful industrial materials. Therefore, in this study, these three clay soils were selected to investigate dispersivi… Show more

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Cited by 44 publications
(23 citation statements)
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“…The similar behavior of anion effect on rheological properties was observed earlier, and it was suggested that salinity affects the dispersion characteristics of drilling fluids. 48 , 60 …”
Section: Results and Discussionmentioning
confidence: 99%
“…The similar behavior of anion effect on rheological properties was observed earlier, and it was suggested that salinity affects the dispersion characteristics of drilling fluids. 48 , 60 …”
Section: Results and Discussionmentioning
confidence: 99%
“…A agregação do solo é dependente de fatores naturais, especialmente aqueles relacionados à mineralogia do solo, também, é decorrente das práticas de manejo, sobretudo aquelas que interferem nos estoques de carbono no solo, como a realização de queimadas e o plantio direto, entre outras (ALHO et al, 2014;SALES et al, 2016). O Cálcio, é um elemento que age no solo com efeito cimentante ao promover a floculação das argilas (Abbaslou, Hadifard & Ghanizadeh, 2020), conforme verifica-se na Tabela 1 que o nível desse elemento no solo antes da implantação do experimento já se encontrava em valores elevados, o que pode ter contribuído para que os resíduos adicionados ao solo não incrementassem a agregação do solo. Pooni et al (2020) verificaram que a adição de material cimentante rico em cálcio e alumínio promove a estabilidade do solo, apontando três mecanismos principais: realização de trocas catiônicas, floculação e aglomeração de argilas e hidratação cimentícia.…”
Section: Atributos Físicos Do Solounclassified
“…The SAR is the ratio of the Na + content to the Ca 2+ and Mg 2+ content in the pore water solution [18]. It is a quantitative indicator to identify dispersibility by measuring the content of cations in soil.…”
Section: Sodium Adsorption Ratio (Sar)mentioning
confidence: 99%
“…According to some research experience in the United States and Australia, the content of exchangeable Na + and the sum of exchangeable cations in the clay mineral structure layer can be calculated. Then, the dispersibility of soil can be 5 Geofluids quantitatively determined by the ratio of the content of exchangeable Na + and the sum of exchangeable cations [18]. The judgment standards were as follows: ESP < 7: nondispersive soil; 7 ≤ ESP < 10: transitional soil; ESP ≥ 10: dispersive soil.…”
Section: Sodium Adsorption Ratio (Sar)mentioning
confidence: 99%
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