A quantitative study of the C3A hydration

被引：91
作者：
Joseph, Shiju [1 ]
Skibsted, Jorgen [2 ,3 ]
Cizer, Ozlem [1 ]
机构：
[1] Katholieke Univ Leuven, Dept Civil Engn, B-3001 Heverlee, Leuven, Belgium
[2] Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark
[3] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus C, Denmark
来源：
CEMENT AND CONCRETE RESEARCH | 2019年 / 115卷
关键词：
Tricalcium aluminate; Hydration; Kinetics; Modelling; TRICALCIUM ALUMINATE HYDRATION; HIGH MAGNETIC-FIELD; AL-27 MAS NMR; PORTLAND-CEMENT; QUADRUPOLAR NUCLEI; KINETICS; PHASES; GYPSUM; STATES;
D O I：
10.1016/j.cemconres.2018.10.017
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of fineness, gypsum content and water - cement (w/c) ratio on the hydration of C(3)A systems have been quantitatively investigated using a combination of experimental techniques (isothermal calorimetry, TGA, XRD, Al-27 MAS NMR) and numerical modelling. It is proposed that the retardation of C(3)A in the presence of calcium sulphates could be (or partially) due to the surface coverage of C(3)A from ettringite precipitation. After the depletion of gypsum, the main calorimetric hydration peak is analyzed using a dissolution mechanism. The numerical model captures the main hydration peak, including peak broadening effects, which increase with the gypsum content and decrease with the fineness. It is found that the increase in w/c ratio (from 0.5 to 1.0) enhances the overall degree of hydration of C(3)A by 7 days of hydration in systems with and without gypsum, which is attributed to the increase in free water with increasing w/c ratio.
引用
收藏
页码：145 / 159
页数：15
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