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Publications (16)
In recent years, attenuation layer method has been considered an effective countermeasure for excavated soils and rocks containing toxic elements like arsenic (As). Non-woven geosynthetic sorption sheets coated with hydrotalcite on one side can be used in the attenuation layer method as a promising sorption material in permanent geostructures and f...
The leaching behavior of arsenic and boron is evaluated in this work through two types of excavated rocks with geogenic contaminants under different temperatures. Excavated rocks with geogenic contaminants are expected to be used in embankments with appropriate countermeasures being taken against the risks brought about by geogenic contamination. T...
Dredged soils are typically mixed with additives to improve their mechanical properties and reduce the risks of leaching toxic elements. An evaluation of blast furnace slag and steelmaking slag as additives is presented here. For this study, Kasaoka clay was used to simulate soft soil. It was mixed with 10, 30, or 50% of slag and cured for several...
An attenuation layer composed of ground mixed with stabilising agents can prevent the contamination of the surrounding area when using soils and rocks with geogenic contaminants in embankments. The optimum particle size of the stabilising agent must be selected based on the requirements of the construction site because the mechanical and chemical p...
Geosynthetic sorption sheet is one of the recently developed countermeasures for geogenic contaminated soils and rocks. This study focused on a geosynthetic sorption sheet containing hydrotalcite. Batch tests and column tests using arsenic solutions were conducted to evaluate the effect of contact time with leachate and overburden pressure anticipa...
Arsenic leaching from shale rock grains was evaluated by the regulatory and modified batch leaching tests. The regulatory test was in according to the Japanese Leaching Test No. 46. The modified batch leaching tests were carried out using de-aired distilled water and eliminating headspace to simulate anaerobic conditions. The results show that diss...
Sorption-desorption column tests using acrylic columns (ϕ 5 cm × h 10 cm) were employed to evaluate the sorption performance of an attenuation layer against geogenic contamination. The attenuation layer material was silica sand amended with 1, 5, or 10% of a stabilising agent. The main component of the agent was magnesium oxide. The sorption behavi...
Utilising naturally contaminated soils and rocks is essential for significantly reducing geo-waste. However, there are no well-established concepts regarding the methods or countermeasures for utilising these soils and rocks, which would realise cost-effectiveness and environmental safety. Therefore, several researches focusing on the attenuation l...
This paper presents selected issues of geotechnical and geoenvironmental engineering in waste landfills in Japan. Due to the limited available land space, there have been efforts in constructing and operating the coastal and offshore landfills, which are expected to provide the opportunities of proper waste management as well as the new land space...
One strategy currently being explored in the development of a technically simple and practical countermeasure when utilising geogenic contaminated soils as fill materials in an embankment involves the installation of a compacted soil layer with attenuation capacity underlain the contaminated geomaterials. Water retention property, which is one of t...
This manuscript focuses on the leaching of geogenic arsenic (As) from shale rock at different temperatures. In Japan, the utilisation of geogenic contaminated soils and rocks for construction such as in embankment is much encouraged. Therefore, when applying thermally active geo-systems such as thermal energy storage and ground-source heat pump, wh...