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Article: Hydrophobisation of clays and nano silica for ground engineering

TitleHydrophobisation of clays and nano silica for ground engineering
Authors
Issue Date2020
PublisherEDP Sciences. The Journal's web site is located at http://www.e3s-conferences.org/
Citation
4th European Conference on Unsaturated Soils (E-UNSAT 2020), Virtual Conference, 19-21st October 2020. Proceedings in E3S Web of Conferences, 2020, v. 195, article no. 03039 How to Cite?
AbstractAltering the hydrophobicity of particles allows their use as functional construction materials in ground engineering (e.g. in barriers). This study examines the hydrophobisation of nano to micro particles by using two clays (kaolin and halloysite) and nano silica. To induce hydrophobicity, dimethyldichlorosilane (DMDCS) was used in concentrations varying from 0.25% to 20%. The sessile drop method was used to measure the contact angle (CA) of the particles. Kaolin was initially hydrophobic with a CA of 93 5◦ while the other two materials were hydrophilic. The addition of DMDCS to the materials increased CAs of all materials investigated. The maximum CAs recorded at 20% for the halloysite, kaolin and nano silica were respectively: 116 5◦, 143 3◦ and 144 6◦. The difference in CAs attained by the clays was attributed to their different structure. Scanning electron microscope-energy dispersive spectroscopy analysis showed increases in carbon content with only halloysite and nano silica after hydrophobisation. The results demonstrate that hydrophobising clays and nano silica can effectively improve their resistance to water infiltration.
Persistent Identifierhttp://hdl.handle.net/10722/294265
ISSN

 

DC FieldValueLanguage
dc.contributor.authorSaulick, Y-
dc.contributor.authorNunes Lourenco, SD-
dc.date.accessioned2020-11-23T08:28:53Z-
dc.date.available2020-11-23T08:28:53Z-
dc.date.issued2020-
dc.identifier.citation4th European Conference on Unsaturated Soils (E-UNSAT 2020), Virtual Conference, 19-21st October 2020. Proceedings in E3S Web of Conferences, 2020, v. 195, article no. 03039-
dc.identifier.issn2267-1242-
dc.identifier.urihttp://hdl.handle.net/10722/294265-
dc.description.abstractAltering the hydrophobicity of particles allows their use as functional construction materials in ground engineering (e.g. in barriers). This study examines the hydrophobisation of nano to micro particles by using two clays (kaolin and halloysite) and nano silica. To induce hydrophobicity, dimethyldichlorosilane (DMDCS) was used in concentrations varying from 0.25% to 20%. The sessile drop method was used to measure the contact angle (CA) of the particles. Kaolin was initially hydrophobic with a CA of 93 5◦ while the other two materials were hydrophilic. The addition of DMDCS to the materials increased CAs of all materials investigated. The maximum CAs recorded at 20% for the halloysite, kaolin and nano silica were respectively: 116 5◦, 143 3◦ and 144 6◦. The difference in CAs attained by the clays was attributed to their different structure. Scanning electron microscope-energy dispersive spectroscopy analysis showed increases in carbon content with only halloysite and nano silica after hydrophobisation. The results demonstrate that hydrophobising clays and nano silica can effectively improve their resistance to water infiltration.-
dc.languageeng-
dc.publisherEDP Sciences. The Journal's web site is located at http://www.e3s-conferences.org/-
dc.relation.ispartofE3S Web of Conferences-
dc.relation.ispartof4th European Conference on Unsaturated Soils (E-UNSAT 2020)-
dc.titleHydrophobisation of clays and nano silica for ground engineering-
dc.typeArticle-
dc.identifier.emailNunes Lourenco, SD: lourenco@hku.hk-
dc.identifier.authorityNunes Lourenco, SD=rp01872-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1051/e3sconf/202019503039-
dc.identifier.hkuros319782-
dc.identifier.volume195-
dc.identifier.spagearticle no. 03039-
dc.identifier.epagearticle no. 03039-
dc.publisher.placeFrance-
dc.identifier.issnl2267-1242-

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