Journal of Arid Land Studies
Online ISSN : 2189-1761
Print ISSN : 0917-6985
ISSN-L : 0917-6985
Volume 28 , Issue 3
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Original Article
  • Shenglei LIN, Mengzhu SONG, Hidetoshi KURAMOCHI, Fumitake TAKAHASHI
    2018 Volume 28 Issue 3 Pages 197-215
    Published: December 30, 2018
    Released: March 15, 2019
    JOURNALS FREE ACCESS

    Coal fly ash (FA) utilization to increase soil moisture retention was motivated to solve soil productivity reduction via desertification and FA recycle problem in arid and semi-arid areas. This study investigated the effect of raw and treated FA amendment on water retention capacity (WRC) of soils (decomposed granite soil and akatama soil) and sands (silica sand and river sand) at room temperature and 40°C. The effects of treated FA amendment has complicated dependency on treatment methods, soil/sand type and temperature. This study found that water repellency, surface area, particle size distribution of FA, capillary water content and pF were insufficient to explain FA amendment effect. However, multi regression analysis suggests that relative changes of WRC after FA amendment can be statistically explained by variations of specific surface area and water repellency with unknown constant. Organics-added thermal treatment suggests appropriate modification of FA surface properties at once is effective to change WRC.

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