Saulick, Y;
Lourenço, SDN;
Baudet, B;
(2021)
Optimising the hydrophobicity of sands by silanisation and powder coating.
Géotechnique
, 71
(3)
pp. 250-259.
10.1680/jgeot.19.P.108.
Preview |
Text
Baudet 2019-Saulick_et_al Geo final.pdf - Accepted Version Download (2MB) | Preview |
Abstract
Sands 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.
| Type: | Article |
|---|---|
| Title: | Optimising the hydrophobicity of sands by silanisation and powder coating |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1680/jgeot.19.P.108 |
| Publisher version: | https://doi.org/10.1680/jgeot.19.P.108 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | chemical properties ground improvement laboratory tests particle-scale behaviour sands |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10084432 |
Archive Staff Only
 |
View Item |
