INFLUENCE OF SULFATE ION AND FLUORIDE ION ON THE FLUIDITY OF CEMENT PASTE WITH POLYCARBOXYLATE BASED SUPERPLASTICIZER HAVING DIFFERENT MOLECULAR STRUCTURE

分子構造の異なるポリカルボン酸系分散剤を添加したセメントペーストの流動性に及ぼす硫酸イオンとフッ化物イオンの影響

Reducing emission of CO₂ is the most important mission in cement industry. And cement industry must contribute to recycling by utilization of industrial waste and by-products as raw materials or fuel. Sulfate and fluoride is prospective ingredient to lower calcinations temperature \nof cement manufacturing for environmental reduction. This paper discusses the influence of sulfate ion and fluoride ion on the fluidity of cement paste and the adsorption of polycarboxylate based superplastisizer having different molecular structure. 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 adsorbed amount of superplasticizer calculated from the concentrations of the superplasticizer in the initial solution and the liquid phase. The unadsorbed superplasticizer concentration was measured by carbon analysis using a total organic carbon analyzer (TOC). Three types polycarboxylate based superplasticizer P-70, P-34 and P-10 were used in this study. The number expresses the degree of polymerization of grafted chain. When the concentration of inorganic ion rose, the apparent viscosity and the amount of adsorbed superplasticizer increased. In the case of K₂SO₄ addition, the apparent viscosity of cement paste with P-10 was smaller than that with P-34. On the contrary, in the case of KF addition, P-34 indicated the smaller apparent viscosity than P-10. The amount of adsorbed P-10 was larger than that of P-34.分子構造が異なるポリカルボン酸系分散剤を添加したセメントペーストの流動性に及ぼす硫酸イオンとフッ化物イオンの影響について検討を加えた。K₂SO₄>またはKFを添加すると、ペーストの見かけ粘度と分散剤吸着量は増大した。K₂SO₄を添加した際は、グラフト鎖長が長い分散剤より短い分散剤で見かけ粘度が小さい値を示した。一方、KFを添加した際は、グラフト鎖長が短い分散剤より長い分散剤で見かけ粘度が小さく、著者らがこれまでに明らかにしているCaCO₃ペーストでの挙動とは異なる傾向を示した。K₂SO₄またはKFを添加した際は、いずれもグラフト鎖が長い分散剤より短い分散剤で吸着量が大きい値を示した。

• Record URL:
  • https://doi.org/10.14250/cement.67.59
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=INFLUENCE+OF+SULFATE+ION+AND+FLUORIDE+ION+ON+THE+FLUIDITY+OF+CEMENT+PASTE+WITH+POLYCARBOXYLATE+BASED+SUPERPLASTICIZER+HAVING+DIFFERENT+MOLECULAR+STRUCTURE&author=K.+MATSUZAWA&author=D.+ATARASHI&author=M.+MIYAUCHI&author=E.+SAKAI&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • MATSUZAWA, Kazuki
  • ATARASHI, Daiki
  • MIYAUCHI, Masahiro
  • SAKAI, Etsuo
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 59-64
• 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: Adsorption; Cement paste; Environmental impacts; Fluidity; Fluorides; Sulfates; Superplasticizers; Viscosity
• Subject Areas: Environment; Highways; Materials; I15: Environment; I30: Materials;

Filing Info

• Accession Number: 01563854
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: May 22 2015 4:14PM