On the hydration of Belite-Ye'elimite-Ferrite (BYF) cement pastes: Effect of the water-to-cement ratio and presence of fly ash

被引：28

作者：

Koga, Guilherme Yuuki ^{[1
,2
,3
]}

Albert, Blandine ^{[2
]}

Nogueira, Ricardo Pereira ^{[3
,4
]}

机构：

[1] Univ Fed Sao Carlos, Dept Mat Sci & Engn, Rod Washington Luis, BR-13565905 Sao Carlos, SP, Brazil

[2] LafargeHolcim Innovat Ctr, 95 Rue Montmurier, F-38291 St Quentin Fallavier, France

[3] Grenoble Alpes Univ, LEPMI, CNRS, F-38000 Grenoble, France

[4] Khalifa Univ Sci & Technol, Chem Engn Dept, POB 127788, Abu Dhabi, U Arab Emirates

来源：

CEMENT AND CONCRETE RESEARCH | 2020年 / 137卷

基金：

巴西圣保罗研究基金会;

关键词：

Hydration products; Pore solution; Mercury Porosimetry; Mechanical properties; Sulfoaluminate; SULFOALUMINATE; PHASE;

D O I：

10.1016/j.cemconres.2020.106215

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This work reports the evolution of the phase assemblage, pore solution, porosity, and mechanical resistance of Belite-Ye'elimite-Ferrite (BYF) cement pastes. Different water-to-cement (w/c) ratios were considered and the addition of fly ash (FA) evaluated. The initial 1-day hydration of BYF cement paste was characterized by the ye'elimite hydration accompanied by a pronounced alkalinity increase controlled mainly by the molar ratio of calcium sulfate to ye'elimite. Throughout the 1-year test, the phase assemblages of 0.50 and 0.67 w/c samples were similar, composed of ettringite, AFm, stratlingite, silicious hydrogarnet, and C-S-H. The hydration of the 0.40 w/c cement paste was almost complete within a month. Additions of 25 wt% FA increased the fraction of stratlingite and ettringite without long-term strength losses compared to plain BYF cement paste with the same water-to-binder ratio. Results from different characterization techniques for both liquid and solid phases at early-age (first 24 h) were complemented by thermodynamic calculations.

引用

页数：12

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