ESTIMATION METHOD OF NON-HYDRATED CEMENT ON CEMENT RECYCLING SYSTEM USING SODIUM GLUCONATE

DOI 2 References
  • ATARASHI Daiki
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering
  • KAMIO Tetsuji
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering
  • AIKAWA Yutaka
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering
  • SAKAI Etsuo
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering

Bibliographic Information

Other Title
  • グルコン酸ナトリウムを用いたセメントリサイクルシステムにおける未水和セメント量の推定方法の確立

Abstract

Most ready-mixed concrete plants have a large problem of construction waste sludge, which causes environmental pollution and economic loss. Therefore, the cement sludge recycling system is highly requested.<br/>Japanese Industrial Standard（JIS）A 5308 permits the addition of 3％ sludge（as solid state）to cement in concrete. However, it is pointed out that the reduction of fluidity and increase of water demand was occurred upon utilization of sludge. To achieve more widespread recycling of sludge by using set-retarders, we have to establish the evaluation method of residual cement content of sludge.<br/>The rate of heat liberation of residual ordinary Portland cement in sludge water was measured by using conduction calorimeter. And the residual amount of sodium gluconate in sludge water was measured by Total Organic Carbon Analyzer（TOC）.<br/>The amount of residual cement in sludge water by XRD quantitative method was related to the heat liberation of residual cement in sludge water. It is concluded that the residual amount of cement in sludge water can be estimated by using conductive type calorimeter. When the Mg（NO3）2・6H2O was added, the retardation of cement hydration by sodium gluconate was decreased. It is considered that the acceleration mechanism of Mg（NO3）2・6H2O is the decrease of sodium gluconate concentration in liquid phase. The amount of residual cement with sodium gluconate in sludge water can be evaluated by using conductive type calorimeter and Mg（NO3）2・6H2O. Furthermore, swift evaluation method of residual cement amount in sludge water is established by using the simulation of heat liberation curve.

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Details 詳細情報について

  • CRID
    1390282679806334080
  • NII Article ID
    130004745782
  • DOI
    10.14250/cement.67.46
  • ISSN
    21873313
    09163182
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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