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Article: Optimising the hydrophobicity of sands by silanisation and powder coating

TitleOptimising the hydrophobicity of sands by silanisation and powder coating
Authors
Keywordschemical properties
ground improvement
laboratory tests
particle-scale behaviour
sands
Issue Date2019
PublisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.geotechnique-ice.com
Citation
Geotechnique, 2019, Epub 2019-12-02, p. 1-10 How to Cite?
AbstractSands are naturally hydrophilic granular materials, yet, rendering them hydrophobic could lend them to a wide range of geotechnical applications. This study describes a powder-coating procedure performed after chemically modifying the surfaces of coarse, medium and fine sands and examines its effect on their hydrophobicity. The purpose is to render these granular materials more hydrophobic than what is conventionally achieved by chemical methods using a simple technique. The procedure consists of first silanising both the sands and silica powder at a similar concentration by means of an organosilane to modify their surface chemistry, then the silica powder is adhered to the sands at a mass mixing ratio to alter their hydrophobicity. Irrespective of the concentrations and mixing ratios, the powder-coating procedure enhances the hydrophobicity of sands in comparison to the sole use of the chemical method. Changes in the morphology of the sand grains, such as their particle size, particle shape and surface roughness, resulting from the powder-coating procedure are examined by means of dynamic image analysis, profilometry and scanning electron microscopy. The effects of surface chemistry, surface roughness and air on the hydrophobicity of the sands are discussed based on theoretical wetting models to analyse the experimental results.
Persistent Identifierhttp://hdl.handle.net/10722/281798
ISSN
2020 Impact Factor: 5.458
2015 SCImago Journal Rankings: 2.837
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSaulick, Y-
dc.contributor.authorNunes Lourenco, SD-
dc.contributor.authorBaudet, BA-
dc.date.accessioned2020-03-27T04:22:38Z-
dc.date.available2020-03-27T04:22:38Z-
dc.date.issued2019-
dc.identifier.citationGeotechnique, 2019, Epub 2019-12-02, p. 1-10-
dc.identifier.issn0016-8505-
dc.identifier.urihttp://hdl.handle.net/10722/281798-
dc.description.abstractSands are naturally hydrophilic granular materials, yet, rendering them hydrophobic could lend them to a wide range of geotechnical applications. This study describes a powder-coating procedure performed after chemically modifying the surfaces of coarse, medium and fine sands and examines its effect on their hydrophobicity. The purpose is to render these granular materials more hydrophobic than what is conventionally achieved by chemical methods using a simple technique. The procedure consists of first silanising both the sands and silica powder at a similar concentration by means of an organosilane to modify their surface chemistry, then the silica powder is adhered to the sands at a mass mixing ratio to alter their hydrophobicity. Irrespective of the concentrations and mixing ratios, the powder-coating procedure enhances the hydrophobicity of sands in comparison to the sole use of the chemical method. Changes in the morphology of the sand grains, such as their particle size, particle shape and surface roughness, resulting from the powder-coating procedure are examined by means of dynamic image analysis, profilometry and scanning electron microscopy. The effects of surface chemistry, surface roughness and air on the hydrophobicity of the sands are discussed based on theoretical wetting models to analyse the experimental results.-
dc.languageeng-
dc.publisherThomas Telford (ICE Publishing). The Journal's web site is located at http://www.geotechnique-ice.com-
dc.relation.ispartofGeotechnique-
dc.subjectchemical properties-
dc.subjectground improvement-
dc.subjectlaboratory tests-
dc.subjectparticle-scale behaviour-
dc.subjectsands-
dc.titleOptimising the hydrophobicity of sands by silanisation and powder coating-
dc.typeArticle-
dc.identifier.emailNunes Lourenco, SD: lourenco@hku.hk-
dc.identifier.emailBaudet, BA: baudet@hku.hk-
dc.identifier.authorityNunes Lourenco, SD=rp01872-
dc.identifier.authorityBaudet, BA=rp01303-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1680/jgeot.19.P.108-
dc.identifier.hkuros309492-
dc.identifier.volumeEpub 2019-12-02-
dc.identifier.spage1-
dc.identifier.epage10-
dc.identifier.isiWOS:000619665000006-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl0016-8505-

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