CARBONATION BEHAVIOR OF PASTES CONTAINING BLAST FURNACE SLAG POWDER

DOI Web Site 9 References
  • MIYAHARA Shigeyoshi
    TAISEI CORPORATION, Technology Center（344-1, Nase-cho, Totsuka-ku, Yokohama-shi, Kanagawa 245-0051, Japan）
  • OGINO Masataka
    TAISEI CORPORATION, Technology Center（344-1, Nase-cho, Totsuka-ku, Yokohama-shi, Kanagawa 245-0051, Japan）
  • OWAKI Eiji
    TAISEI CORPORATION, Technology Center（344-1, Nase-cho, Totsuka-ku, Yokohama-shi, Kanagawa 245-0051, Japan）
  • SAKAI Etsuo
    TOKYO INSTITUTE OF TECHNOLOGY, School of Materials and Chemical Technology（2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan）

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Other Title
  • 高炉スラグ微粉末を使用したペーストの炭酸化による変質挙動

Abstract

<p>With the aim of elucidating the mechanism of carbonation of cement containing a large amount of ground granulated blast furnace slag, changes in the pore structure and hydrates due to an accelerated carbonation were investigated. With a special focus on C-S-H, changes of its composition in the inner products （IP） and outer products （OP） were evaluated by SEM-EDS. As the results, carbonation reduces the porosity but increases the large-diameter pores （coarsens the pores）. Mixtures with a high carbonation rate lead to more significant pore coarsening due to carbonation. SEM-EDS measurements revealed that the IP C-S-H releases Ca due to carbonation to drastically reduce the Ca/Si, decomposing to an aluminosilicate gel（Ca/Si＜2/3）. In the OP region, Ca（OH）2 and C-S-H decomposes into CaCO3. Furthermore, Ca released from the IP transfers to the OP region to form CaCO3. Al/Si of C-S-H did not change by carbonation, which means that Al and Si are held in C-S-H throughout carbonation. Decalcification decrease Ca/Si, and C-S-H decompose to form aluminosilicate gel. By NMR study, it was clarified that Si tetrahedron was polymerized by carbonation, and Al in C-S-H was incorporated into aluminosilicate gel together with Si.</p>

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