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All Journal Lowland Technology International
Takenori Hino
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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CONTAMINANT ADSORPTION CHARACTERISTICS OF KYUSHU REGIONAL SOILS Yan Jun Du; Shigenori Hayashi; Takenori Hino; Kenta Tanaka
Lowland Technology International Vol 2 No 2, Dec (2000)
Publisher : International Association of Lowland Technology

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Abstract

Four types of Kyushu regional soils, Ariake clay, Haido, Akaboku, and Diatom earth were selected to evaluate their capacities of contaminant adsorption. The contaminants presented in this study are there types of single-salt solutions, KCL, NaCL, and CaCL2 respectively. A batch-type test was performed for each soil and Freundlich model was adopted to plot adsorption isotherms. It was found that among the tested soils. Ariake clay has the highest adsorption capacity in the case of K+ and Ca2+ ions, whereas Diatom earth fails to adsorb any cation. Based on the adsorption isotherms, the cation selectivity of each soil was given. It is concluded that the contaminant adsorption capacity of clay soil is significantly affected by the soil cation exchange capacity (CEC). For a given soil, it seems that the mobility of the cation of the interested species when it transports through soil is mainly controlled by the cation replaceability, its initially adsorbed concentration and nature of the soil, provided that the other conditions remain constant.
Maximum Tension Lines of MSE Embankments with Polymer and Metallic Reinforcements on Different Foundations Types a Dennes T. Bergado; Salisa Chaiyaput; Ray M. Basilio; Ochakkraphat Sukchaisit; Takenori Hino
Lowland Technology International Vol 23 No 3 (2021): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v23i3.999

Abstract

Four full scale and fully instrumented mechanically stabilized earth (MSE) test embankments were constructed to 6 m high for analyses and comparison of their behaviour, namely: one on hard ground, one on DCM improved ground and two on soft ground. The MSE on hard ground was reinforced with strong polymer geogrid in one side as well as metallic grids and strips in the other side. The MSE on improved ground was reinforced with hexagonal grids. Due to the negligible vertical and lateral movements in hard and improved ground, the consequent maximum tension lines were observed to closely follow the bilinear Coherent Gravity Method with standard distance from the facing of 0.3H where H is the equivalent height of the reinforced embankment. Moreover, two fully instrumented MSE were constructed on soft ground having similar trapezoidal cross-sections. One embankment was reinforced with polymer geogrids and the other with steel grids. The resulting large vertical and lateral movements of both embankments have almost identical patterns. The maximum tension lines of both embankments closely resemble to that of Coherent Gravity Method but with location of the vertical line portion at closer distances of 0.1H to 0.2H from the embankment facing.
Co-Authors Dennes T. Bergado Kenta Tanaka Ochakkraphat Sukchaisit Ray M. Basilio Salisa Chaiyaput Shigenori Hayashi Yan Jun Du