INFLUENCE OF SHORT-TERM IMMERSION IN SODIUM SULFATE ON PROPERTY OF OXGEN TRANSPORT IN HARDENED CEMENT PASTE

• HERLY NICOLAS OTSUKA SAKATA

  UNIVERSITY OF YAMANASHI, Faculty of Engineering, Integrated Graduate School of Medicine, Engineering and Agricultural Sciences（4-3-11, Takeda, Kofu-shi, Yamanashi 400-8511, Japnan）

• SATO Kennosuke

  UNIVERSITY OF YAMANASHI, Graduate School of Engineering, Department of Civil Engineering and Environmental Engineering（4-3-11, Takeda, Kofu-shi, Yamanashi 400-8511, Japnan）

• SAITO Shigehiko

  UNIVERSITY OF YAMANASHI, Graduate School of Engineering, Department of Civil Engineering and Environmental Engineering（4-3-11, Takeda, Kofu-shi, Yamanashi 400-8511, Japnan）

Bibliographic Information

Other Title

• 硫酸ナトリウムの短期間の作用がセメント硬化体における酸素移動性状に及ぼす影響

Abstract

The present study experimentally examined the relationship between the property of oxygen transport in hardened cement paste after sodium sulfate solution immersion and the change of hydration products. Oxygen diffusion coefficient, pore volume, pore distribution and phase composition of cement paste specimens exposed to sodium sulfate solution and ion exchanged water were acquired. As the result, the oxygen diffusion coefficient of the specimens after sodium sulfate immersion decreased compared to that of the specimens after ion exchanged water immersion. This decrease in the oxygen diffusion coefficient was considered to be caused by the complication of the pore structure of the hardened cement paste due to the decrease of pore volume （diameter ＞ 20nm） when the specimens are immersed in sodium sulfate solution. And there was a certain correlation between the volume of C-S-H and ettringite and the pore volume （diameter ＞ 20nm）. It is one of the evident that the formation of ettringite reduced the pore volume （diameter ＞ 20nm） and reduced the oxygen diffusion coefficient.

Journal

• Cement Science and Concrete Technology

  Cement Science and Concrete Technology 73 (1), 79-86, 2020-03-31

  Japan Cement Association

Keywords

• Sulfate attack
• Sodium sulfate
• Oxygen diffusion coefficient
• Pore structure
• Tortuosity
• Ettringite
• C-S-H

Details

• CRID: 1390846609820256768
• NII Article ID: 130007822445
• DOI: 10.14250/cement.73.79
• ISSN: 21873313
• ISSN: 09163182
• Web Site: https://www.jstage.jst.go.jp/article/cement/73/1/73_79/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed