No abstract

Capillary barrier cover systems (CBCSs) are useful and low-cost earthen cover systems for preventing water infiltration and controlling seepage at solid waste landfills. A possible technique to enhance the impermeable properties of CBCSs is to make water repellent grains by mixing the earthen cover material with a hydrophobic agent (HA). In this study, six different grains with different geometries and sizes were used to prepare dry hydrophobized grains by mixing with different contents of oleic acid as a HA. Wet hydrophobized grains were prepared by adjusting the water content (h g ; kg kg -1 ) of dry hydrophobized grains. To characterize the water repellency (WR) of dry and wet hydrophobized grains, initial solidwater contact angles (a i ) were measured using the sessile drop method (SDM). Based on SDM results from the a i -