A STUDY ON THE DIFFUSIVITY OF IONS THROUGH MORTAR AND THE CHANGE OF CEMENT HYDRATION DUE TO THE CHEMICAL DETERIOLATION PROCESS

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  • HISADA Makoto
    社団法人 土木学会 独立行政法人土木研究所 技術推進本部
  • ITO Shin-ya
    電気化学工業株式会社 セメント特混研究所
  • SAKAI Takayoshi
    社団法人 土木学会 新潟大学大学院 自然科学研究科

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  • セメント硬化体の化学的侵食過程におけるイオンの拡散性状と水和物量の変化
  • セメント コウカタイ ノ カガクテキ シンショク カテイ ニ オケル イオン ノ カクサン セイジョウ ト スイワ ブツリョウ ノ ヘンカ

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In this paper, the ion-diffusivity through hardened cement mortar, and the chemical deterioration of mortar due to the attack of various electrolyte solution, were investigated from the viewpoint of concrete durability. As the source electrolyte, NaCl, CaCl2, H2SO4, Na2SO4, NaNO3 and HNO3 were prepared and dissolved into de-ionized water. For testing the ion diffusivity and degradation of cement hydrations, the ion diffusion cell, which was modified by AASHTO-T 277, was set up. And Ca(OH)2, CSH and AFm were mainly measured as the cement hydration products. Through these test results, the deterioration mechanisms of cement mortar were experimentally investigated.

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