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HYDRAULIC PROPERTIES OF POLYMER-ENHANCED BENTONITE-SAND MIXTURE

  • The hydraulic properties of the polymer-enhanced bentonite-sand mixtures (PEBSMs) investigated in this study consisted of the water retention behaviour (or the soil-water characteristic curve (SWCC)) and the saturated and unsaturated coefficients of permeability. The SWCCs of the compacted polymer-enhanced bentonite-sand mixtures were measured using two techniques; namely, axis-translationThe hydraulic properties of the polymer-enhanced bentonite-sand mixtures (PEBSMs) investigated in this study consisted of the water retention behaviour (or the soil-water characteristic curve (SWCC)) and the saturated and unsaturated coefficients of permeability. The SWCCs of the compacted polymer-enhanced bentonite-sand mixtures were measured using two techniques; namely, axis-translation technique and vapour equilibrium technique. The results obtained from both methods were combined to establish a single SWCC for each specimen. The saturated coefficient of permeability of the material was measured using the constant-head flexible wall permeameter method. The unsaturated coefficient of permeability was computed from the SWCCs and the saturated permeability values using the statistical model. The study revealed that the wetting curves for the PEBSM and clay are above the drying curves. The fact is thought be due to the specimens being not saturated before starting the drying tests. Since the specimens are expensive soil such a trend can be expected. The permeability deduced from the oedometer test data over-estimates the actual water flow rate resulting in a higher computed saturated coefficient of permeability compared to the measured values. The nets of polymer and bentonite clusters are thought to retard the flow of water during the direct measurement. However, the net of polymer and bentonite clusters are compressed during loading and rebound during unloading. Hysteresis effect was found for the PEBSMs in the permeability versus degree of saturation curve. This is due to possible difference in the spatial distribution of water in the specimens depending whether the specimens were on drying or wetting path.show moreshow less

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Metadaten
Document Type:Master's Thesis
Author: Muhammad Ibrar Khan
DOI (Cite-Link):https://doi.org/10.25643/bauhaus-universitaet.680Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20111215-6803Cite-Link
Language:English
Date of Publication (online):2005/10/17
Year of first Publication:2005
Release Date:2005/10/17
Publishing Institution:Bauhaus-Universität Weimar
Granting Institution:Bauhaus-Universität Weimar, Fakultät Bauingenieurwesen
Institutes:Fakultät Bauingenieurwesen / Professur Bodenmechanik
Tag:Hydraulic properties; bentonite-sand mixture; polymer-enhanced; soil mechanics
GND Keyword:Baustoff
Dewey Decimal Classification:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Licence (German):License Logo Copyright All Rights Reserved
Note:
Der Volltext-Zugang wurde im Zusammenhang mit der Klärung urheberrechtlicher Fragen mit sofortiger Wirkung gesperrt.