Abstract
A capillary barrier cover system (CBCS) is a low-cost solution for limiting water infiltration into solid waste landfills. Moreover, hydrophobized sublayer sand grains enhance the impermeable properties of the CBCS. In this study, we have assessed water repellency characteristics for oleic acid (OA) mixed sands representing four different particle size fractions ranging from 0.105 to 0.84 mm. Initial soil-water contact angle (αi), and the time dependence of contact angle were measured by the sessile drop method. Results showed that the αi value for fine and middle sand fractions increased rapidly from 0o to ~100o with increasing OA content from 0 to around 3.0 g OA kg-1 sand. The hydrophobized fine and middle sand fractions are suitable for sublayer in the CBCS. A recently proposed equation, α (t) = αi exp (-At), where t is time and A is the coefficient of coefficient of temporal change in contact angle (α), well captured the time dependence of α.
| Original language | English |
|---|---|
| Title of host publication | Unsaturated Soils : Research & Applications |
| Editors | Nasser Khalili, Adrian Russell, Arman Khoshghalb |
| Number of pages | 6 |
| Volume | 1 |
| Place of Publication | Rotterdam |
| Publisher | CRC Press |
| Publication date | 2014 |
| Pages | 255-260 |
| ISBN (Print) | 978-1-138-00150-3 (set of 2 volumes), 978-1-138-02689-6 (vol 1), 978-1-138-02690-2 (vol 2) |
| ISBN (Electronic) | 978-1-135-74958-7 (eBook PDF) |
| Publication status | Published - 2014 |