Effect of Bentonite Addition on the Properties of Fly Ash as a Material for Landfill Sealing Layers

Mariola Wasil

Abstract

Landfill sealing layers protect groundwater and soil against contamination from waste leachate. Fly ash, which is a coal combustion by-product, might be used as a substitute material for natural soils to build sealing layers. To improve its properties, different additives can be used. In this study, bentonite in the amounts of 5%, 10% and 15% of the dry mass of fly ash was used as an addition. Compacted fly ash and fly ash-bentonite mixtures were tested in order to verify how bentonite and the amount of addition affect the properties of the materials. Therefore, hydraulic conductivity, as the most important parameter, which determines the suitability of a material for construction landfill sealing layers, were tested. Results indicate that bentonite changes the properties of fly ash and allows the achievement of smaller hydraulic conductivity values. To provide a comparison to the natural soil, sandy silty clay that meets the criteria for natural soils for sealing layers was tested and the differences are presented. Fly ash with 15% of bentonite addition reached a value of hydraulic conductivity for the material suitable to build compacted landfill sealing layers.
Author Mariola Wasil (FCEE / DGSM)
Mariola Wasil,,
- Department of Geotechnics and Structural Mechanics
Journal seriesApplied Sciences-Basel, [Applied Sciences (Switzerland)], ISSN 2076-3417, (N/A 70 pkt)
Issue year2020
Vol10
No4
Pages1-13
Publication size in sheets0.6
Article number1488
Keywords in Englishfly ash; bentonite; hydraulic conductivity; landfill sealing layers
ASJC Classification1507 Fluid Flow and Transfer Processes; 1508 Process Chemistry and Technology; 1706 Computer Science Applications; 2200 General Engineering; 2500 General Materials Science; 3105 Instrumentation
DOIDOI:10.3390/app10041488
URL https://www.mdpi.com/2076-3417/10/4/1488
Internal identifierROC 19-20
Languageen angielski
LicenseJournal (articles only); published final; Other open licence; with publication
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 24-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.985; WoS Impact Factor: 2018 = 2.217 (2) - 2018=2.287 (5)
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