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In the repair of the reinforced concrete structures deteriorated due to the chloride corrosion of rebars, it is desirable that the electrical resistivity of the patching repair mortar is equal to or lower than that of the existing concrete, considering the case of adopting the cathodic protection in the future. In general, cementitious patching repair mortars contain polymer components, which are thought to increase the resistivity, but there are also components other than polymer components that affect the resistivity. Such components without polymer include admixture components such as ground granulated blast furnace slag and fly ash, cement components such as ultra rapid hardening cement, and corrosion inhibitor components such as lithium nitrite. In this study, the effects of those components on the resistivity of cementitious patching repair mortars up to the age of 26 weeks are clarified. As a result, the electrical resistivity of cementitious patching repair mortar depends greatly on the types and amounts of their components.

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Effects of Polymers and Other Material Components on Electrical Resistivity of Cement Mortar

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Mikio Wakasugi,
  • Takuya Fukui,
  • Toshiyuki Kanda,
  • Katsunori Demura

摘要

In the repair of the reinforced concrete structures deteriorated due to the chloride corrosion of rebars, it is desirable that the electrical resistivity of the patching repair mortar is equal to or lower than that of the existing concrete, considering the case of adopting the cathodic protection in the future. In general, cementitious patching repair mortars contain polymer components, which are thought to increase the resistivity, but there are also components other than polymer components that affect the resistivity. Such components without polymer include admixture components such as ground granulated blast furnace slag and fly ash, cement components such as ultra rapid hardening cement, and corrosion inhibitor components such as lithium nitrite. In this study, the effects of those components on the resistivity of cementitious patching repair mortars up to the age of 26 weeks are clarified. As a result, the electrical resistivity of cementitious patching repair mortar depends greatly on the types and amounts of their components.