硫酸イオンの浸入と機械的特性の変化からみたセメント硬化体の変質

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  • 大脇 英司
    大成建設 (株) 技術センター土木技術研究所
  • 坂井 悦郎
    東京工業大学大学院理工学研究科材料工学専攻
  • 大門 正機
    東京工業大学大学院理工学研究科材料工学専攻

書誌事項

タイトル別名
  • Alteration Depth and Mechanical Properties of Hardened Cement Bodies Attacked by Sulfate Ion.
  • リュウサン イオン ノ シンニュウ ト キカイテキ トクセイ ノ ヘンカ カラ ミタ セメント コウカタイ ノ ヘンシツ

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抄録

It is well known that cementitious materials are deteriorated by sulfate attack. Submerging tests of hardened cement paste and mortars were employed with sodium sulfate solution. The samples were prepared from ordinary portland cement and blast furnace slag cement. The test results showed that the sulfateion migration was not governed by Fick's law. In the region of sulfate ion migrated, ettringite precipitated as a secondary product and the volume of capillary pores, in diameter of 18.3-212.5nm, decreased. It was also observed that pores in diameter of 18.3-212.5nm developed at areas where sulfate ion did not migrate. This should be considered as an important feature. In addition, secondary formation of gypsum was identified in the case of blast furnace slag cement. Compressive strength test and 3-point bending test were carried out to diagnose the mechanical performance against the sulfate ion ingress. Two types of alteration model were considered to evaluate the alteration depth and degree. Each model is working for the compressive test and the bending test, individually. We have proposed new indexes with these models. These indexes describe the alteration depth and degree, and closely relate to other indexes, such as sulfate ion migration depth and so on. According to these indexes, it seems that sulfate ion migration might cause filling of pore and generating of micro defect, alternatively, and progress the deterioration. This mechanism showed good agreement with apparent phenomena such as changes in profiles of sulfate ion and in strength.

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