電気泳動法における塩化物イオン移動性状に対して電気浸透流が及ぼす影響  [in Japanese] INFLUENCE OF ELECTRO OSMOTIC FLOW ON CHLORIDE ION TRANSPORT AT THE ELECTRO MIGRATION TEST  [in Japanese]

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Abstract

電気泳動法における塩化物イオン移動性状に対して、移流現象である電気浸透流が及ぼす影響の把握を目的として実験的検討を行った。その結果、モルタル硬化体の電気浸透流速度は、ペースト硬化体と比較し陽極から陰極への電気浸透流が生じる傾向にあること、電気浸透流速度は硬化体のゲル空隙率と相関を有することを明らかにした。また、電気泳動法によって得られた塩化物イオン全フラックスをNernst-Plank式に基づき、電気泳動と電気浸透流によるフラックスにそれぞれ分離し検討を行い、電気泳動法における塩化物イオン移動性状に対して電気浸透流が及ぼす影響は、特定のケースにおいては無視できないことを示した。

The electro migration test is commonly used to obtain the effective diffusion coefficient of chloride ion in hardened cementitious materials. Other hands, if the saturated porous material, which has the electrically-charged pore surface, is applied a voltage, the electro osmotic flow is generated in pore. Additionally, surface of hydration products is charged by the reaction of surface complex between ions in pore solution and the surface functional group, such as silanol group. Therefore, it is considered that the chloride ion transport at the electro migration test is affected by electro osmotic flow. However, the influence of electro osmotic flow on chloride ion transport at the electro migration test is not studied by previous research.<br/> In this study, the flux of chloride ion and the electro osmotic velocity generated by the electro migration test were measured. From the results, the electro osmotic velocities between paste and mortars were different. In addition, the electro osmotic velocity had the correlation with gel porosity of hardened cementitious materials. The influence of electro osmotic flow on chloride ion transport at the electro migration test was different for different types of binder, paste and mortar.

Journal

  • Cement Science and Concrete Technology

    Cement Science and Concrete Technology 68(1), 360-366, 2014

    Japan Cement Association

Codes

  • NII Article ID (NAID)
    130005129390
  • Text Lang
    JPN
  • ISSN
    0916-3182
  • Data Source
    J-STAGE 
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