FLUIDITY AND INITIAL HYDRATION OF CEMENT HAVING HIGH ALUMINATE PHASE ADDED ANHYDRITE AND LIMESTONE POWDER

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  • AOYAGI Yuji
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate school of Nuclear Engineering
  • MARUYA Eiji
    UBE-MITSUBISHI CEMENT RESEARCH INSTITUTE CORPORATION, Ube Center, Cement Group
  • ICHINOSE Ryotaro
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate school of Science and Engineering
  • SAKAI Etsuo
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate school of Science and Engineering

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Other Title
  • 無水セッコウと石灰石微粉末を添加したアルミネート相高含有セメントの流動性と初期水和

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When the utilization volume of industrial wastes and by-products in cement plants are increased, it is necessary to control the fluidity of cement containing a large amount of aluminate phase. In my research I investigated the fluidity and the initial hydration of cement containing a large amount of aluminate phase added limestone powder, anhydrite and hemihydrite. Cement clinkers were synthesized from industrial raw materials and reagents by using an electric furnace in laboratory. The aluminate phase contents of clinkers were about 8 mass％ and 12 mass％. Cement pastes were prepared adding polycarboxylate type superplasticizer under water-cement ratio was 0.32. Apparent viscosities of the cement pastes were measured with a concentric-cylinder type rotational viscometer. The fluidity of the cement paste containing aluminate phase of 12 mass％ increased as the amount of hemihydrite increased. On the other hand, it decreased as the amount of anhydrite increased. No matter what kind of gypsum was added, the limestone powder was able to improve the fluidity of cement paste containing a large amount of aluminate phase. These results are not correlated to relation between adsorption of polymer per unit area and apparent viscosity. But the apparent viscosities of the cement pastes were associated with the heat generation rates of the cement pastes. As a result, the fluidity of the cement paste containing aluminate phase of 12 mass％ was improved by adding limestone powder more than 10 mass％ and anhydrite 4 mass％.

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