EFFECT OF THE ADDITION OF CALCIUM NITRITE ON THE HYDRATION AND STRENGTH OF HIGH SULPHATE SLAG CEMENT WITH SYNTHETIC CALCIUM CARBONATE

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  • ITOH Takayasu
    MITSUBISHI UBE CEMENT CORPORATION, Research & Development Center（1-6, Okinoyama, Kogushi, Ube-shi, Yamaguchi 755-8633, Japan） SHIMANE UNIVERSITY, Science of Environmental Systems, Graduate School of Natural Science and Technology（1069, Nishikawatsu-cho, Matsue-shi, Shimane 690-0823, Japan）
  • ATARASHI Daiki
    SHIMANE UNIVERSITY, Science of Environmental Systems, Graduate School of Natural Science and Technology（1069, Nishikawatsu-cho, Matsue-shi, Shimane 690-0823, Japan）
  • HARADA Soya
    MITSUBISHI UBE CEMENT CORPORATION, Research & Development Center（1-6, Okinoyama, Kogushi, Ube-shi, Yamaguchi 755-8633, Japan）
  • OSAKI Masashi
    MITSUBISHI UBE CEMENT CORPORATION, Research & Development Center（1-6, Okinoyama, Kogushi, Ube-shi, Yamaguchi 755-8633, Japan）

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Other Title
  • 合成炭酸カルシウムを配合した高硫酸塩スラグセメントの水和反応と強度発現性に及ぼす亜硝酸カルシウム併用添加の影響

Abstract

<p>In this study, we investigated the effect of the combinate addition of synthesized calcium carbonate （CC） and calcium nitrite （CN） on the hydration and strength of high sulphate slag cement （HS-BFSC） containing 1-3％ ordinary Portland cement （OPC） and 15％ gypsum. The addition of CC increased the initial hydration of the BFS up to 7 days, however, tended to reduce the long-term strength elongation. On the other hand, the addition of CN, in addition to improving the significant reduction in strength at 3％ OPC, can complement the long-term strength when CC is added. The use of CN for accelerator may produce low-carbon cement with the same level of strength as Portland blast furnace slag cement class B and C （JIS R 5211）, but with significantly reduced CO2 emissions.</p>

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