| Title: |
Compacted sand–bentonite mixtures for the confinement of waste landfills |
| Authors: |
Proia R.; Salvatore E.; Croce P.; Modoni G. |
| Contributors: |
Robeta Proia, • Erminio Salvatore, • Paolo Croce, • Giuseppe Modoni; Proia, R.; Salvatore, E.; Croce, P.; Modoni, G. |
| Publication Year: |
2024 |
| Collection: |
IRIS Unicas (Università degli Studi di Cassino e del Lazio Meridionale) |
| Subject Terms: |
Bentonite compaction; Bentonite hydraulic conductivity; Bentonite swelling; Compaction of sand–bentonite mixture; Hydraulic conductivity of sand–bentonite mixture; Oedometer test on bentonite; Oedometer test on sand–bentonite mixture; Sand–bentonite mixture; Swelling of sand–bentonite mixture; Waste landfills confinement |
| Description: |
This paper illustrates the results of an experimental study on sand–bentonite mixtures for their use as confinement barriers for solid waste landfills. The mixtures have been prepared parametrically varying the percentage of bentonite. The sample preparation method was established willing to simulate the compaction processes on site. In fact, the compacted samples were tested following two different stress-wetting paths representative of the possible stress and imbibition sequences occurring on a landfill confinement barrier. In the first case, the barrier comes into contact with rainwater before being subjected to the overloading stress induced by waste disposal, while, in the second case, the barrier is overloaded by the waste before being wetted by the leachate. The compressibility and permeability of the sand–bentonite mixtures were determined, in both cases, by oedometric compression tests. The experimental results are analysed and compared in order to evaluate the influence of the bentonite content on the mechanical and hydraulic behaviour of the mixture. Interpretation of the results is also accomplished with a micro-mechanical investigation of the mixtures fabric. Suitable compositions of sand and bentonite are finally proposed for the design of effective confinement barriers. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/wos/001226710400001; journal:ACTA GEOTECHNICA; https://hdl.handle.net/11580/108188 |
| DOI: |
10.1007/s11440-024-02335-7 |
| Availability: |
https://hdl.handle.net/11580/108188; https://doi.org/10.1007/s11440-024-02335-7 |
| Rights: |
info:eu-repo/semantics/restrictedAccess |
| Accession Number: |
edsbas.67493E1A |
| Database: |
BASE |