THE INFLUENCES OF ALKALI SULFATE ON THE PROPERTIES OF QUICK-HARDENING CEMENT COMPOUND

硫酸アルカリが急硬性セメント組成物の物性に及ぼす影響

The properties of cement quick-hardening additive are influenced depending on the quality of cement used. However, little is known concerning the influences of miner constituents on the properties of cement additives. One of miner constituents contained in cement is an alkali compound. In this report, the authors have studied about the influences of alkali sulfate on the properties of quick-hardening cement compound. As a result, they found the following influences；1）Mortar flow became larger or smaller depending on dosage or kind of alkali sulfate. The authors assumed that larger or smaller mortar flow is because of the interaction of alkali with not only cement, but also quick-hardening additive. 2）Workable time tended to become shorter. They confirmed that workable time is associated with the formation of ettringite. 3）Compressive strength at early age became slightly higher, but that after 7 days became lower. The authors have assumed that higher compressive strength at early age is associated with the formation of ettringite and lower compressive strength after medium age is associated with sparseness of compositions of hardened cement compound by the presence of alkali. 4）Expansion strain became larger. The authors assumed that high concentration of sulfate and hydroxide ion promotes topochemical reaction and increases the amount of ettringite formed. 5）Ettringite formation reaction was promoted if alkali sulfate was contained in quick-hardening cement compound.硫酸アルカリが急硬性セメント組成物の物性に及ぼす影響を検討した。その結果、①モルタルフロー値は、硫酸アルカリの添加率や種類によって、大きくなる場合や小さくなる場合があった。②可使時間は短くなる傾向があった。③初期材齢の圧縮強さは、やや高くなったが、材齢7日以降の圧縮強さは、低くなった。④膨張率は大きくなった。⑤硫酸アルカリが急硬性セメント組成物中に存在すると、エトリンガイトの生成反応が促進されることを確認した。

• Record URL:
  • https://doi.org/10.14250/cement.67.123
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=THE+INFLUENCES+OF+ALKALI+SULFATE+ON+THE+PROPERTIES+OF+QUICK-HARDENING+CEMENT+COMPOUND&author=H.+HARA&author=T.+MORI&author=T.+HIGUCHI&author=M.+MORIOKA&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • HARA, Hirofumi
  • MORI, Taiichiro
  • HIGUCHI, Takayuki
  • MORIOKA, Minoru
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: pp 123-128
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 67
  • 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: Alkali; Aluminous cement; Cement additives; Cement content; Concrete hardening; Ettringite; Properties of materials
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01563821
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: May 22 2015 4:14PM