Fundamental Study on the Penetrability of Nitrite-Type Repair Materials into Mortar

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  • INOUE Masumi
    Department of Civil and Environmental Eng., Kitami Inst. of Tech.
  • SUDOH Yuhji
    Chemicals Division, Basic Chemicals Department, Nissan Chemical Industries, Ltd.
  • CHOI Heesup
    Department of Civil and Environmental Eng., Kitami Inst. of Tech.
  • OKADA Kaneyoshi
    Department of Civil and Environmental Eng., Kitami Inst. of Tech.
  • AYUTA Koichi
    Department of Civil and Environmental Eng., Kitami Inst. of Tech.

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Other Title
  • 亜硝酸塩系補修剤のモルタルへの浸透性に関する基礎的研究
  • アショウサンエンケイ ホシュウザイ ノ モルタル エ ノ シントウセイ ニ カンスル キソテキ ケンキュウ

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Abstract

<p>This study aimed to clarify the influence of the type and concentration of nitrite-type repair materials on ion penetrability in cement mortar. The permeability test for various repair material was carried out in order to compare the physical permeability of nitrite-type repair materials. In addition, repaired mortar specimens were prepared for ion penetrability test using nitrite-type repair material, and the amount of penetration of nitrite and lithium ions were measured under outdoor and indoor conditions. As a result, the impregnation of a lithium nitrite solution became larger than that of a calcium nitrite solution in the permeability test. Moreover, when the nitrite-type repair material was directly coated on the surface of mortar specimen, it was confirmed that the amount of penetration of nitrite ions of a lithium nitrite solution became larger than that of a calcium nitrite solution. It is thought that a coexisting positive ion affects the penetration property of nitrite ions in hardened cement mortar.</p>

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