Accelerated weathering of hydrophobized sands

Hydrophobized sands have been suggested as materials for hydraulic barriers in infrastructure. When placed at the interface ground–atmosphere, environmental factors such as temperature and rainfall are expected to impact their performance and impair their durability. This study uses accelerated weat...

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Bibliographic Details
Published in:Acta geotechnica 2022-02, Vol.17 (2), p.377-390
Main Authors: Lin, Hongjie, Lourenço, Sérgio D. N.
Format: Article
Language:English
Subjects:
Accelerated tests
Ageing
Aging
Complex Fluids and Microfluidics
Degradation
Drying
Engineering
Environmental factors
Fatty acids
Foundations
Freezing
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
High temperature
Hydraulics
Hydrophobicity
Immersion
Laboratories
Melting
Moisture content
Molecular weight
Polyvinyl alcohol
Rain
Rainfall
Research Paper
Sand
Soft and Granular Matter
Soil Science & Conservation
Solid Mechanics
Submerging
Temperature
Thawing
Water immersion
Weathering
Wetting
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Summary:Hydrophobized sands have been suggested as materials for hydraulic barriers in infrastructure. When placed at the interface ground–atmosphere, environmental factors such as temperature and rainfall are expected to impact their performance and impair their durability. This study uses accelerated weathering tests to investigate the degradation of industrial sands functionalized with Tung oil, heated Tung oil and dimethyldichlorosilane to render them hydrophobic. Laboratory samples were subjected to thermal ageing, water immersion, cyclic wetting–drying and cyclic freezing–thawing and analysed for their hydrophobic degradation (magnitude and persistency) including controlling mechanisms via surface imaging and analysis. The results revealed that (1) elevated temperature and prolonged water immersion degraded hydrophobicity, albeit with differences between the coatings: dimethyldichlorosilane-treated sands were stable under thermal ageing; (2) a greater concentration of hydrophobizing compounds could minimize hydrophobic degradation during cyclic wetting–drying; (3) freezing–thawing had a negligible effect on hydrophobicity. In order to minimize their degradation, these results suggest that hydrophobized sands can be synthesized by adjusting the hydrophobizing compound and its concentration to suit a specific application.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-021-01235-4