Apparent diffusion coefficients of Cs and I in hardened cement paste using mineral admixtures

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  • MIHARA Morihiro
    Radioactive Waste Processing and Disposal Research Department, Nuclear Fuel Cycle Engineering Laboratories, Sector of Nuclear Fuel, Decommissioning and Waste Management Technology Development, Japan Atomic Energy Agency
  • HARASAWA Shuichi
    Electric & Nuclear Powers Technology Department, Taiheiyo Consultant Co. Ltd.
  • TORII Kazuyuki
    Faculty of Geosciences and Civil Engineering, Institute of Science and Engineering, Kanazawa University

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  • 鉱物質混和材を使用したセメントペースト硬化体に対するセシウムおよびヨウ素の見掛けの拡散係数
  • コウブツシツ コンワザイ オ シヨウ シタ セメントペースト コウカタイ ニ タイスル セシウム オヨビ ヨウソ ノ ミカケ ノ カクサン ケイスウ

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Abstract

<p>  Hardened cement pastes (HCPs) of water/cement ratio (W/C) 50% and 30% using fly ash (FA), blast furnace slag (BFS) and silica fume (SF) for 28 days were prepared. Apparent diffusion coefficients (Da) of Cs and I in HCPs were obtained using electron probe microanalysis. For Cs, BFS and SF contributed to a reduction of Da for W/C=50% and 30%, respectively. For I, BFS reduced Da for W/C=50%, however a significant reduction in Da for W/C=30% was not observed. Using SF enhanced sorption of Cs on HCP, and using BFS slightly improved sorption of Cs on HCP. It was also confirmed that the pore structures of HCP using SF and BFS were connected by fine pores. It was therefore considered that using SF and BFS contributes to the reduction of Da in HCP.</p>

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