海砂代替材に活用される石炭灰造粒物の長期的な物理化学特性評価  [in Japanese] EVALUATION OF LONG-TERM PHYSICOCHEMICAL PROPERTIES OF USING GRANULATED COAL ASH AS ALTERNATIVE MATERIAL OF SEA SAND  [in Japanese]

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Abstract

石炭灰(FA)を造粒・固化した海砂代替材(石炭灰造粒物)が干潟再生材に使用され,その底質改善効果が確認されている.その材料特性による生物親和性や改善機能が報告されているが,実海域で長期間覆砂材に活用した場合の海砂代替材としての物理特性(強度,吸水率,形状)の維持や化学特性に伴う組成変化については明らかにされていない.本研究は,石炭灰造粒物を覆砂材として活用する場合の物理化学特性に基づく長期的な機能性維持について,実験的に明らかとすることを目的とした.敷設後13年および3年が経過した石炭灰造粒物を採取し,覆砂層の再現によるマクロ的手法と元素分析によるミクロ的手法により実験し,長期的な物理化学特性(強度,吸水率,元素構成,結晶組成物,および溶存態イオンの溶出)の変化について明らかとした.

 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.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_940-I_945, 2016

    Japan Society of Civil Engineers

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