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

混凝土流动性材料的材料设计与质量控制体系

• 批准号: 11650462
• 负责人: SAKAI Etsuo
• 金额: $ 2.18万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650462/
• 关键词: Concrete; Fluidity; Comb-type superplasticizer; Hydration; Inorganic electrolytes; Adsorption; Dispersion mechanisms; Materials design; 無桟電解質; セメントコンクリート

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.

为了发展自密实混凝土、高强混凝土和高耐久性混凝土，需要用梳型高效减水剂控制混凝土的流动性。本研究讨论了梳型高效减水剂的接枝链长度和用量对吸附和分散机制的影响，以及它们对浓缩石灰石悬浮液流动性的影响。此外，已经观察到添加某些可影响CaCO_3悬浮液液相中Ca 2+ 浓度的可溶性盐会降低梳型聚合物在CaCO_3上的吸附。因此，固体表面上的聚合物吸附过程可以选择性地受到某些类型的离子的影响。在C_3A-硫酸钙体系中添加梳型高效减水剂可加速C_3A的早期水化。在梳型高效减水剂的情况下，C_3A周围形成的凝胶中SO_4^2-的含量降低。为了控制梳型高效减水剂水泥的流动性，必须控制铝酸盐相的早期水化反应。

项目成果

E.Sakai, Jinkyu-Kang and M.Daimon: "Action Mechanisms of Comb-type Superplasticizers containing Grafted Polyethylene Oxide."ACI SP. 195-6. 75-89 (2000)

E.Sakai、Jinkyu-Kang 和 M.Daimon：“含有接枝聚环氧乙烷的梳型高效减水剂的作用机制”。ACI SP。

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)

Jinkyu-Kang、Jonkyu-Lee、E.Sakai 和 M.Daimon：“高效减水剂对 C_3A 与石膏或硬石膏水化的影响”水泥科学

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)

E.Sakai、A.Kawakami和M.Daimon等：“无机电解质对梳型聚合物分散机制的影响”。J.Ceram.Soc.Japan。

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)

E.Sakai，M.Daimon，Lee JongKyu，S.Nagataki：“高效减水剂对研磨水合水泥的水泥浆体流动性的影响”Proc。

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)

Jinkyu-Kang、Y.Ohoba、E.Sakai 和 M.Daimon：“高效减水剂对 Ca_3Al_<>O_6-CaSO_4·2H_3O-CaO 体系水化的影响”。《水泥科学与混凝土技术》第 54 期。 27 (2000)