Physical degradation of hydrophobized sands

• Published in: Powder technology Vol. 367; pp. 740 - 750
• Main Authors: Lin, Hongjie, Lourenço, Sérgio D.N.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.05.2020; Elsevier BV
• Subjects: Assessments; Degradation; Granular materials; Hydrophobicity; Micro-Deval test; Polydimethysiloxane; Sand; Sand degradation; Sand hydrophobicity; Tung oil; Sand hydrophobicity; Sand degradation; Tung oil; Micro-Deval test; Polydimethysiloxane
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2020.04.015

Hydrophobized sands can be used to control infiltration as barriers in ground infrastructure. As coated granular materials, the interaction between particles is assumed to damage the coatings leading to a reduction in hydrophobicity. This study provides an insight into the physical degradation of hydrophobized sands treated with Tung oil, heated Tung oil and dimethyldichlorosilane. The Micro-Deval test is proposed and used for the first time to assess the degradation of the hydrophobized sands. The testing programme investigates the effect of the Micro-Deval testing conditions (number of revolutions and pore fluid or medium – dry/wet) and hydrophobicity (concentration and type of hydrophobic compounds) on the particle degradation and hydrophobicity degradation. Overall, this study demonstrated the effectiveness of the new methodology to investigate the physical degradation of hydrophobized sands, with the Micro-Deval test able to provide a rapid assessment of various hydrophobized sands under a range of conditions. •Sands can be hydrophobized by dimethyldichlorosilane and (heated) Tung oil.•Abrasion of the sands performed with a Micro-Deval apparatus.•Results revealed a decreased particle size and hydrophobicity due to abrasion.•Size and hydrophobicity changes depend on hydrophobizing treatment.