Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature

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Title:Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature
Creators:
Leelamanie, D.A.L.; leelamanie at soil dot ruh dot ac dot lk; Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka.
Karube, Jutaro; Faculty of Agriculture, Ibaraki University, 3-21-1 Chuo, Ami-machi, Ibaraki-ken 300-0393, Japan.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 62, 2, pp. 97-100
Uncontrolled Keywords:aggregate stability, contact angle, floating time, janapese andisol, hydrophobicity, wetting rate

Abstract

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.

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Title:Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature
Translated title:Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature
Creators:
Leelamanie, D.A.L.; leelamanie at soil dot ruh dot ac dot lk; Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka.
Karube, Jutaro; Faculty of Agriculture, Ibaraki University, 3-21-1 Chuo, Ami-machi, Ibaraki-ken 300-0393, Japan.
Uncontrolled Keywords:aggregate stability, contact angle, floating time, janapese andisol, hydrophobicity, wetting rate
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:62
Number:2
Page Range:pp. 97-100
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8191
Item Type:Article
Deposited On:05 Jun 2014 18:31
Last Modified:05 Jun 2014 16:31

Citation

Leelamanie, D.A.L.; Karube, Jutaro (2014) Water stable aggregates of Japanese Andisol as affected by hydrophobicity and drying temperature. Journal of Hydrology and Hydromechanics, 62 (2). pp. 97-100. ISSN 0042-790X

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