Abstract
It has confirmed that covering sea sand alternative material, granulated coal ash (GCA) which made by granulating fly ash, on sediment can improve both reduced sediment and water environments (i.e. improving benthos living conditions). However, it is necessary to evaluate long-term evaluation of physicochemical properties (e.g., strength, water absorption capacity, chemical composition) of GCA. In this study, we aim to physicochemically examine long-term effects of GCA as a covering material though laboratory experiments. We conducted elemental and structural analyses, and dissolution experiments of GCA that collected at 3 and 13 years after applying into in-situ. There was almost no change of the GCA structure at 13 years, suggesting GCA as an alternative stable material of sea sand. However, there were some changes in chemical conditions of GCA due to its dissolution and absorption with other ions.
