Determination of Uncombined Quartz in Hydrothermal Reaction of Quartz and Portland Cement

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  • ASAGA Kiyoshi
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • OHSAWA Shigenari
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • UWANISHI Gisuke
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • OHTA Kyoichiro
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology
  • DAIMON Masaki
    Department of Inorganic Materials, Faculty of Engineering, Tokyo Institute of Technology

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  • セメント‐石英系水熱反応における未反応石英の定量
  • セメント - セキエイケイ スイネツ ハンノウ ニ オケル ミ ハンノウ セキ

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Abstract

Filtration method has been used for the quantitative determination of uncombined quartz in hydrothermal reaction system. Modifying this method, the authors tried a centrifugal method, and compared both methods in the student experiment in Tokyo Institute of Technology. The centrifugal method was found to be easier, and it was possible to measure in a short time. The standard deviation was within 0.5%, that was smaller than that of filtration method.<br>Several dissolution experiments were also carried out in order to obtain the basic informations related to this technique. The results of the treatment with 2N HCl only, showed bigger values because of the remaining of colloidal silica. When the ground quartz was treated with 5% Na2CO3 solution, only the amorphous silica, which was formed by grinding, was dissolved. And the amount of dissolution was constant even the time of treatment and the concentration of Na2CO3 solution were varied. It was clear that 195-280mg of absolute amount of silica gel could be dissolved in 30ml of 5% Na2CO3 solution in the condition of the given method of uncombined quartz determination.

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