Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions
The paper discusses the results of an experimental research on the short and long term hydraulic performance and sorption of cement-bentonite mixtures in saline sulphate solutions. Batch tests at different curing times and permeation tests were performed on three cement-bentonite mixtures with solut...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Soils and Foundations |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0038080623000446 |
| _version_ | 1797790936610111488 |
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| author | Evelina Fratalocchi Jonathan Domizi Mirko Felici Francesco Mazzieri |
| author_facet | Evelina Fratalocchi Jonathan Domizi Mirko Felici Francesco Mazzieri |
| author_sort | Evelina Fratalocchi |
| collection | DOAJ |
| description | The paper discusses the results of an experimental research on the short and long term hydraulic performance and sorption of cement-bentonite mixtures in saline sulphate solutions. Batch tests at different curing times and permeation tests were performed on three cement-bentonite mixtures with solutions of K2SO4. The results show that permeation can adversely affect the hydraulic performance of cement-bentonite mixtures depending on the sulphate concentration and mixture composition and that the choice of a very low permeable mixture is essential to limit adverse effects of interaction with SO42- on the hydraulic performance.Sorption of K+ was found to be significant, well described by a linear isotherm in a wide range of concentration and nearly constant with curing. Sorption of SO42 was found to decreases with mixture porosity. Since sorption of SO42- means negative interaction, batch tests were found to be useful for a rapid estimation of possible negative effect of SO42- on the hydraulic behaviour in the long term, when selecting a mixture in the design phase.All the results point out the importance of selecting a mixture to be used for cut-off walls with a low hydraulic conductivity already at brief curing and of carefully considering interaction with solute pollutants and sorption capacity. |
| first_indexed | 2024-03-13T02:11:36Z |
| format | Article |
| id | doaj.art-fc6fa5f92e7e48388d6dd2d23d06eb62 |
| institution | Directory Open Access Journal |
| issn | 2524-1788 |
| language | English |
| last_indexed | 2024-03-13T02:11:36Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Soils and Foundations |
| spelling | doaj.art-fc6fa5f92e7e48388d6dd2d23d06eb622023-07-01T04:33:40ZengElsevierSoils and Foundations2524-17882023-06-01633101315Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutionsEvelina Fratalocchi0Jonathan Domizi1Mirko Felici2Francesco Mazzieri3Corresponding author at: via Brecce Bianche 12, 60131 Ancona, Italy.; Università Politecnica Delle Marche, Ancona, ItalyUniversità Politecnica Delle Marche, Ancona, ItalyUniversità Politecnica Delle Marche, Ancona, ItalyUniversità Politecnica Delle Marche, Ancona, ItalyThe paper discusses the results of an experimental research on the short and long term hydraulic performance and sorption of cement-bentonite mixtures in saline sulphate solutions. Batch tests at different curing times and permeation tests were performed on three cement-bentonite mixtures with solutions of K2SO4. The results show that permeation can adversely affect the hydraulic performance of cement-bentonite mixtures depending on the sulphate concentration and mixture composition and that the choice of a very low permeable mixture is essential to limit adverse effects of interaction with SO42- on the hydraulic performance.Sorption of K+ was found to be significant, well described by a linear isotherm in a wide range of concentration and nearly constant with curing. Sorption of SO42 was found to decreases with mixture porosity. Since sorption of SO42- means negative interaction, batch tests were found to be useful for a rapid estimation of possible negative effect of SO42- on the hydraulic behaviour in the long term, when selecting a mixture in the design phase.All the results point out the importance of selecting a mixture to be used for cut-off walls with a low hydraulic conductivity already at brief curing and of carefully considering interaction with solute pollutants and sorption capacity.http://www.sciencedirect.com/science/article/pii/S0038080623000446Cement-bentoniteSulphatePotassiumSorptionHydraulic conductivity |
| spellingShingle | Evelina Fratalocchi Jonathan Domizi Mirko Felici Francesco Mazzieri Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions Soils and Foundations Cement-bentonite Sulphate Potassium Sorption Hydraulic conductivity |
| title | Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions |
| title_full | Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions |
| title_fullStr | Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions |
| title_full_unstemmed | Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions |
| title_short | Sorption and hydraulic performance of cement-bentonite cutoffs in saline sulphatic solutions |
| title_sort | sorption and hydraulic performance of cement bentonite cutoffs in saline sulphatic solutions |
| topic | Cement-bentonite Sulphate Potassium Sorption Hydraulic conductivity |
| url | http://www.sciencedirect.com/science/article/pii/S0038080623000446 |
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