STUDY ON CEMENT RECYCLING SYSTEM USING SODIUM GLUCONATE

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  • ATARASHI Daiki
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering
  • YAMADA Masato
    TOKYO INSTITUTE OF TECHNOLOGY, Graduate School of Science and Engineering
  • MIYAUCHI Masahiro
    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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  • グルコン酸ナトリウムを用いたセメントリサイクルに関する基礎的研究

Abstract

Most ready-mixed concrete plants have a problem of construction waste sludge, which causes environmental pollution and economic loss. A cement sludge recycling system is therefore highly desirable.<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 a reduction of fluidity and increase in water demand occur 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.The rate of heat liberation of ordinary Portland cement paste was measured by using conduction calorimeter. And the residual amount of sodium gluconate was measured by Total Organic Carbon Analyzer（TOC）.<br/>The residual alite amount of cement paste by XRD quantity method was related to the heat liberation of cement paste. It is concluded that the residual alite amount of cement paste can be estimated by conductive type calorimeter. The amount of residual alite of cement paste can be evaluated swiftly by using conductive type calorimeter and Mg（NO3）2・6H2O. When the Mg（NO3）2・6H2O was added, the retardation of cement hydration with sodium gluconate was decreased. It is considered that the acceleration mechanism of Mg（NO3）2・6H2O is the decreasing of sodium gluconate concentration in liquid phase.

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