Factors influencing the hydration kinetics of ye'elimite; effect of mayenite

被引：52
作者：
Bullerjahn, Frank [1 ,2 ]
Zajac, Maciej [1 ]
Ben Haha, Mohsen [1 ]
Scrivener, Karen L. [2 ]
机构：
[1] HeidelbergCement AG, Global R&D, Oberklamweg 2-4, D-69181 Leimen, Germany
[2] Ecole Polytech Fed Lausanne, LMC, STI, Lab Construct Mat,IMX, Stn 12, CH-1015 Lausanne, Switzerland
来源：
CEMENT AND CONCRETE RESEARCH | 2019年 / 116卷
关键词：
Iron-bearing solid solution ye'elimite hydration; Solution composition; Saturation indices; Mayenite; RAW MIX DESIGN; POWDER DIFFRACTION; PHASE-TRANSITION; THERMAL-ANALYSIS; SULFOALUMINATE; CEMENTS; WASTES;
D O I：
10.1016/j.cemconres.2018.10.026
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The aim of this study was to understand the origin of the variation in the hydraulic reactivity of ye'elimite systems. To this end, the hydration of two clinkers, one composed mainly of synthetic stoichiometric (C(4)A(3)(S) over bar) "Y" and the other of an iron-bearing solid solution (C(4)A(28)F(0.2)(S) over bar) "Fe-Y" ye'elimite, were studied. The hydration sequences and main products were similar in both systems, but the kinetics of the Fe-11 clinker were faster. The analyses of the solution composition at early times revealed an increase of the calcium and aluminium ion concentration for Fe-Y compared to Y, whereas the sulphate ion concentration was almost identical. This resulted in an initially higher oversaturation with respect to ettringite and monosulfate for the Fe-Y clinker. Experimental results demonstrate the accelerated formation of ettringite, which explained the faster early hydration kinetics. The cause for this was the presence of small amounts of mayenite (C(12)A(7)) in the Fe-Y clinker. The impact of mayenite was verified by the addition of synthetic mayenite to the stoichiometric ye'elimite clinker. Consequently, there is no evidence that presence of iron in the ye'elimite structure nor changes in polymorphism influence the hydraulic reactivity of ye'elimite.
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页码：113 / 119
页数：7
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