The method for measuring of water repellency of soil

Abstract

This study is an attempt to establish an evaluation method of water repellency of soil ranging complete wet ability to complete nonwettability. The principal used was the theory of capillary rise. The samples were packed into teflon tubes which are verv hydrophobic and placed at a certain depth in water. In this method, the height of capillary rise of very nonwettable sample would remain under the free water level even for an infinite lime. On the other hand, the letting front of the wettable samples would be above the free water level for an infinite lime. This method is considered to The suitable for both writable and nonwettable samples. It was found that not onlv writable samples but also nonwettable samples changed to be completely lettable by healing at 250°C, and also thai this change was particularly remarkable in the case of humic acid.From the ratio of the maximum height of capillary rise of the sample heated at 105°C to that 250°C, the sample heated at 250°C, the water repellency of the soil sample can be represented as contact angle, whether the sample is very wettable of nonwettable. © 1976 Taylor & Francis Group, LLC.