In: Journal of Hydrology and Hydromechanics, vol. 62, no. 2
D.a.l. Leelamanie - Jutaro Karube
Detaily:
Rok, strany: 2014, 97 - 100
Kľúčové slová:
Aggregate stability; Contact angle; Floating time; Japanese Andisol; Hydrophobicity; Wetting rate.
URL originálneho zdroja: http://www.ih.savba.sk/jhh
O článku:
Hydrophobicity is a property of soils that reduces their affinity for water, which may help impeding the
pressure build-up within aggregates, and reducing aggregate disruption. The purpose of this study was to examine the
relation of soil hydrophobicity and drying temperature to water stability of aggregates while preventing the floating of
dry aggregates using unhydrophobized and hydrophobized surface Andisol. Soil was hydrophobized using stearic acid
into different hydrophobicities. Hydrophobicity was determined using sessile drop contact angle and water drop
penetration time (WDPT). Water stability of aggregates (%WSA) was determined using artificially prepared model
aggregates. The %WSA increased as the contact angle and WDPT increased. Contact angle and WDPT, which provided
maximum %WSA showing less than 1 s of floating, was around 100° and 5 s, respectively. Although the %WSA
gradually increased with increasing contact angle and WDPT above this level, high levels of hydrophobicity initiated
aggregate floating, which would cause undesirable effects of water repellency. Heating at 50°C for 5 h d–1 significantly
affected %WSA and hydrophobicity in hydrophobized samples, but did not in unhydrophobized samples. The results
indicate that the contact angle and wetting rate (WDPT) are closely related with the water stability of aggregates. The
results further confirm that high levels of hydrophobicities induce aggregate floating, and the drying temperature has
differential effects on hydrophobicity and aggregate stability depending on the hydrophobic materials present in the soil.
Ako citovať:
ISO 690:
Leelamanie, D., Karube, J. 2014. Water stable aggregates of Japanese Andisol as affected by hydrophobicity and
drying temperature. In Journal of Hydrology and Hydromechanics, vol. 62, no.2, pp. 97-100. 0042-790X (until 2019) .
APA:
Leelamanie, D., Karube, J. (2014). Water stable aggregates of Japanese Andisol as affected by hydrophobicity and
drying temperature. Journal of Hydrology and Hydromechanics, 62(2), 97-100. 0042-790X (until 2019) .