INVESTIGATION ON MECHANISM OF LONG-TERM STRENGTH DEVELOPMENT OF CARBONATED CEMENT-TREATED SAND

炭酸化したセメント系砂質改良土の長期強度発現メカニズム

The mechanism of the long-term strength development of carbonated cement-treated soils was experimentally investigated. The unconfined uniaxial compressive strength of the carbonated specimen of the cement-treated soil was larger than that of the non-carbonated specimen cured in the sealed condition. In the carbonated specimens, the strength of the specimen carbonated in the air was larger than that of the specimen carbonated in the accelerated camber. The effect of the carbonation method on the strength was analyzed. Then, it was found that forms of carbonated C-S-H gel has significant effect on the strength development rather than the amount of reacted CO₂ and chemically bound water. In the case of the specimen containing bentonite, the strength of the carbonated specimen cured in the air was almost same as the strength of the specimen cured in the sealed condition. It was caused that the carbonation prevented the additional increase of the strength by pozzolanic reaction.炭酸化したセメント系砂質改良土の長期強度発現メカニズムを解明するために各種試験を実施した。セメント系砂質改良土を炭酸化すると、封緘養生に比べ、一軸圧縮強さが大きくなった。炭酸化方法により強度発現に違いが有り、促進炭酸化養生よりも気中養生を施した場合に強度が増進した。各種分析結果から、炭酸化したときの強度の増進にはCO₂含有量や結合水量よりも炭酸化したC-S-Hの形態が影響している。ベントナイトを混合した場合、封緘養生と気中養生の長期強度は同等であった。これは気中養生では炭酸化に伴い、ポゾラン反応が阻害されたためであると考えられる。

• Record URL:
  https://doi.org/10.14250/cement.68.523
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=INVESTIGATION+ON+MECHANISM+OF+LONG-TERM+STRENGTH+DEVELOPMENT+OF+CARBONATED+CEMENT-TREATED+SAND&author=M.+SHOJI&author=M.+MORIOKA&author=T.+YOSHIDA&author=K.+NAKARAI&publication_year=2014
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • SHOJI, Makoto
  • MORIOKA, Minoru
  • YOSHIDA, Tomomi
  • NAKARAI, Kenichiro
• Publication Date: 2014

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 523-528
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 68
  • Issue Number: 1
  • Publisher: Japan Cement Association
  • ISSN: 0916-3182
  • EISSN: 2187-3313
  • Serial URL: https://www.jstage.jst.go.jp/browse/cement/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Bentonite; Carbon dioxide; Carbonation; Cement; Neutralization; Pozzolanic action; Sand; Solidification; Strength of materials
• Subject Areas: Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers; I40: Soils and Rocks;

Filing Info

• Accession Number: 01563151
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: May 18 2015 11:00AM