FLUIDITY OF BLAST FURNACE CEMENT WITH COMB-TYPE SUPERPLASTICIZERS HAVING DIFFERENT MOLECULAR STRUCTURE

分子構造の異なる高分子系分散剤を添加した高炉セメントの流動特性

Reducing emission of CO₂ is the most important problem in the cement industry. And cement industry must contribute to recycling by utilization of industrial waste and by-products as raw materials or fuel. Recently, blast furnace cement has been noted for environmental loading reduction. This paper discusses the adsorption and the dispersion mechanism of comb-type superplastisizer having different molecular structure as the blended blast furnace cement.Using a control stress type rheometer（rotational cylinder viscometer）, the viscosity of the suspension was measured to estimate the apparent viscosity at a shear stress of 200 Pa. The absorbed amount of polymer calculated from the concentrations of the polymer in the initial solution and the liquid phase. The unabsorbed polymer concentration was measured by carbon analysis using a total organic carbon analyzer（TOC）.Comb-type superplasticizer having smaller amount of functional groups is adsorbed on blast furnace slag (BFS) compared with OPC. And comb-type superplasticizer having larger amount of functional groups is adsorbed on both BFS and OPC. In the case of comb-type superplasticizer having larger amount of functional groups, the fluidity of cement paste was influenced by the replacement ratio of BFS. On the other hand, in the case of comb-type superplasticizer having smaller amount of functional groups, the fluidity of cement paste was not influenced by the replacement ratio of BFS. Therefore comb-type superplasticizer having smaller amount of functional groups could be suitable for blended cement.分子構造の異なる櫛形高分子系分散剤を用いて高炉セメントへの吸着・分散作用、高炉スラグ置換率が流動性に及ぼす影響について検討を加えた。櫛形高分子系分散剤の分子構造が異なるとセメント、高炉スラグへの吸着特性が大きく異なることを明らかとした。また、セメントへの吸着性が低い櫛形高分子系分散剤を添加した場合は高炉スラグ置換率が増大しても流動性が低下しないこと、セメントへの吸着性が高い櫛形高分子系分散剤を添加した場合は高炉スラグ置換率が増大すると流動性が低下することを明らかとした。セメントへの吸着性が低く高炉スラグへの吸着性が高い櫛形高分子系分散剤が高炉セメント系の分散剤として有効である可能性を指摘した。

• Record URL:
  • https://doi.org/10.14250/cement.66.28
• Record URL:
  • https://www.jstage.jst.go.jp/article/cement/66/1/66_28/_pdf
• 
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=FLUIDITY+OF+BLAST+FURNACE+CEMENT+WITH+COMB-TYPE+SUPERPLASTICIZERS+HAVING+DIFFERENT+MOLECULAR+STRUCTURE&author=D.+ATARASHI&author=S.+TAMAKI&author=M.+MIYAUCHI&author=E.+SAKAI&publication_year=2012
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • ATARASHI, Daiki
  • TAMAKI, Shinji
  • MIYAUCHI, Masahiro
  • SAKAI, Etsuo
• Publication Date: 2012

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 28-33
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 66
  • 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: Adsorption; Blends; Cement paste; Fluidity; Pollutants; Rheological properties; Slag; Superplasticizers; Viscosity
• Uncontrolled Terms: Emissions reduction
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01522870
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 24 2014 11:44AM