Effect of fly ash microsphere on the rheology and microstructure of alkali-activated fly ash/slag pastes

被引：250
作者：
Yang, Tao [1 ,2 ]
Zhu, Huajun [1 ]
Zhang, Zuhua [3 ,4 ]
Gao, Xuan [1 ]
Zhang, Changsen [1 ]
Wu, Qisheng [1 ]
机构：
[1] Yancheng Inst Technol, Sch Mat Engn, Yancheng 224051, Jiangsu, Peoples R China
[2] China Bldg Mat Acad, 1 Guanzhuang Dongli Chaoyang Dist, Beijing 100024, Peoples R China
[3] Hunan Univ, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China
[4] Univ Southern Queensland, Ctr Future Mat, West St, Toowoomba, Qld 4350, Australia
来源：
CEMENT AND CONCRETE RESEARCH | 2018年 / 109卷
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
Fly ash microsphere; Alkali-activated cement (D); Rheology (A); Microstructure (B); WATER FILM THICKNESS; PORTLAND-CEMENT; SILICA FUME; ACCELERATED CARBONATION; PHASE EVOLUTION; YIELD-STRESS; SLAG PASTES; GEOPOLYMER; ADMIXTURES; SUPERPLASTICIZER;
D O I：
10.1016/j.cemconres.2018.04.008
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The highly viscous property of alkali silicate-activated cements is one of the critical challenges that hinder their wide application. The present study focuses on ameliorating the rheological performance of sodium silicate activated fly ash/slag pastes by using fly ash microsphere (FAM), which are highly spherical particles collected from fly ash with electrostatic adsorption classification technology. The FAM particles work as 'ball-bearings' in the pastes to reduce the internal friction between fly ash and slag grains, and meanwhile mitigate the agglomeration of flocs and fragmentation to release the locked water. The interrelationship between the FAM particle geometry and plastic viscosity of the paste is well described by the Krieger-Dougherty equation, which supports the proposed mechanisms of 'ball-bearings' effects. FAM can work as an inorganic dispersing agent to improve the workability of alkali-activated cement products for a variety of application aspects.
引用
收藏
页码：198 / 207
页数：10
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