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2000 Fiscal Year Final Research Report Summary

Material Design and Quality Control System of Materials for Fluidity of Concrete

Research Project

Project/Area Number 11650462
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionTokyo Institute of Technology

Principal Investigator

SAKAI Etsuo  Tokyo Institute of Technology, Faculty of Engineering , Associate Professor, 大学院・理工学研究科, 助教授 (90126277)

Co-Investigator(Kenkyū-buntansha) OHBA Yoko  Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 大学院・理工学研究科, 助手 (50223938)
Project Period (FY) 1999 – 2000
KeywordsConcrete / Fluidity / Comb-type superplasticizer / Hydration / Inorganic electrolytes / Adsorption / Dispersion mechanisms / Materials design
Research Abstract

For the development of self compacting concrete, high strength concrete and high duarable concrete, it is necessary to control the fluidity of concrete with comb-type superplasticizers. This study discusses the influence of graft chain length and dosage of comb-type superplasticizers on adsorption and dispersion mechanisms, and their subsequent effect on the fluidity of concentrated limestone suspensions. Furthermore, the addition of certain soluble salts, which can effect the concentration of Ca^<2+> in liquid phase of CaCO_3 suspensions, has been observed to decrease the adsorption of comb-type polymers on CaCO_3. Thus, the polymer adsorption process on solid surfaces can be selectively influenced by certain types of ions. Early hydration of C_3A is accelerated by adding of comb-type superplasticizers in C_3A-calcium sulfates systems. In the case of comb-type superplasticizers, SO_4^<2-> contents in gel formed around C_3A is decreased. It is necessary to control the early hydration reaction of aluminate phase in order to control the fluidity of the cement with comb-type superplasticizers.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Jim Kyu Kang,JongKyuLee 坂井悦郎,大門正機: "C_3A-セッコウ系水和反応に及ぼす分散剤の影響"Cement Science & Concrete Tech.. No.53. 71-77 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂井悦郎,川上晃,大門正機 etc.: "櫛形高分子の分散作用に及ぼす無機電解質の影響"J.Ceram.Soc.Japan. 108(10). 904-908 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jim Kyu Kang,大場陽子,坂井悦郎,大門正機: "Ca_3Al_2O_6-CaSO_4・2H_2O-CaO系水和反応に及ぼす分散剤の影響"Cement Science & Concrete Tech.. No.54. 22-27 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂井悦郎,川上晃,中村明則,大門正機: "高性能AE減水剤の分散作用に及ぼす各種リン酸塩の影響"Cement Science & Concrete Tech.. No.54. 87-92 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Sakai,Jim Kyu Kang, and M.Daimon: "Action Mechanisms of Comb-type superplasticizers Containing grafted polyethylene oxide chains"ACI SP 195-6. 75-89 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Sakai,M.Daimon,Lee JongKyu,S.Nagataki: "Influence of superplasticizers on the fluidity of cement paste with ground hydrated cement"Proc. Int'l Workshop on Recycled Concrete, JSPS F6 Committe. 69-76 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jinkyu-Kang, Jonkyu-Lee, E.Sakai and M.Daimon: "Influence of Superplasticizers on the Hydration of C_3A with Gypsum or Anhydrite"Cement Science & Concrete Tech.. No.53. 71-77 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Sakai, A.Kawakami and M.Daimon etc.: "Influence of Inorganic Electrolytes on the Dispersion Mechanisms of Comb-type Polymer."J.Ceram.Soc.Japan. 108(10). 904-908 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jinkyu-Kang, Y.Ohoba, E.Sakai and M.Daimon: "Influence of Superplasticizers on the Hydration in Ca_3Al_<>O_6-CaSO_4・2H_3O-CaO System."Cement Science & Concrete Tech.. No.54. 22-27 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Sakai, A.Kawakami, A.Nakamura and M.Daimon: "Influence of Various Types of Potassium Phosphates on the Dispersion Mechanisms of Comb-type Superplasticizer."Cement Science & Concrete Tech.. No.54. 87-92 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Sakai, Jinkyu-Kang and M.Daimon: "Action Mechanisms of Comb-type Superplasticizers containing Grafted Polyethylene Oxide."ACI SP. 195-6. 75-89 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Sakai, J.K.Lee, M.Daimon and S.Nagataki: "Influence of Superplasticizers on the Fluidity of Cement paste with Ground Hydrated Cement."Proc.Int'l Workshop on Recycled Concrete, JSPS 76 Committee. 69-76 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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