セメント系硬化体のゼータ電位に影響を及ぼす各種要因の検討  [in Japanese] INFLUENTIAL FACTORS ON ZETA POTENTIAL OF HARDENDE CEMENTITIOUS MATERIALS  [in Japanese]

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Abstract

セメント系硬化体中の空隙表面電位は、イオンの拡散性状に影響を及ぼすと考えられている。本研究では、空隙表面電位を近似的に表すことのできるゼータ電位に着目し、細孔溶液組成、水和物の種類と生成量、溶液温度がセメント系硬化体に及ぼす影響について検討を行った。また、各硬化体の細孔溶液を抽出し、そのイオン組成を模擬した溶液中で硬化体を構成する各種水和物のゼータ電位の測定し、実際のセメント系硬化体のゼータ電位を推定することを試みた。その結果、セメント系硬化体を構成する各種水和物の生成量、比表面積、ゼータ電位を積算することにより、実際のセメント系硬化体のゼータ電位を精度良く推定することが可能となった。

The pore surface potential affects the diffusion coefficient of ion in concrete. It is important for durability assessment of construction to forecast ion transport quantitatively. Therefore, the authors forcused on zeta potential which can be approximative value of the pore surface potential. The purpose of this study is to evaluate the effects of the ion composition of pore solution, the amounts and kinds of hydration products, and solution temperature on the zeta potential of the hardened cementitious materials.<br/>In this study,(1)the effects of zeta potential were investigated by varying the solution temperature,(2)Zeta potential of hardened materials were estimated by using each solution simulating the pore solution of hardened materials, and integtrating the amounts, specific surface area and zeta potential of each hydration product which constitutes the hardened materials.<br/>As the result,(1)the effects of zeta potential were investigated by varying the solution temperature. Changes in zeta potential with solution temperature were mainly due to changes in calcium ion concentration of liquid phase.(2)the calculated values of the zeta potential of hardened cementitious materials using mineral admixture were lower than experimental results. Then, the improvement of estimation accuracy was observed by considering C-A-S-H and calcium aluminate hydrate. Consequently, the zeta potential of hardened materials can be estimated in consideration of the zeta potential of each hydration.

Journal

  • Cement Science and Concrete Technology

    Cement Science and Concrete Technology 66(1), 182-188, 2012

    Japan Cement Association

Codes

  • NII Article ID (NAID)
    130004574690
  • Text Lang
    JPN
  • ISSN
    0916-3182
  • Data Source
    J-STAGE 
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