Dissolution and early hydration of tetracalcium aluminoferrite (C4AF) in water and in aqueous sulfate solutions

被引：7
作者：
Ye, Shaoxiong [1 ]
Feng, Pan [2 ,3 ]
Liu, Jiaping [2 ,3 ]
机构：
[1] Huaqiao Univ, Coll Civil Engn, Xiamen 361021, Peoples R China
[2] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Construct Mat, Nanjing 211189, Peoples R China
[3] State Key Lab High Performance Civil Engn Mat, Nanjing 210008, Peoples R China
来源：
CEMENT AND CONCRETE RESEARCH | 2024年 / 186卷
基金：
中国国家自然科学基金;
关键词：
Tetracalcium aluminoferrite; Reactivity; Dissolution; Hydration; Sulfate; TRICALCIUM ALUMINATE; ADSORPTION MECHANISMS; KINETICS; REACTIVITY; GYPSUM; PHASE; C4AF;
D O I：
10.1016/j.cemconres.2024.107676
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Fe-rich cementitious phases, such as tetracalcium aluminate (C(4)AF), are likely the least characterized and understood components of ordinary cements, in terms of their reactivity and early-age reactions. In this study, we provided the first in-situ measurements of C(4)AF's absolute dissolution rates in water and aqueous sulfate solutions (Na2SO4, MgSO4 and CaSO4) along with its early-age hydration characterization. Upon contact with water, C(4)AF dissolved at a rate of 1.74 +/- 0.23 mu mol center dot m(-2)center dot s(-1), and sulfates were found to inhibit its reaction. Among the three types of sulfates tested, CaSO4 exhibited the strongest inhibition effect, while Na2SO4 showed the weakest inhibition. Soon after the initial dissolution, the precipitation of hydrates occurred, and the presence of sulfates affected the overall hydration process of C(4)AF. These results enhance our understanding of C(4)AF's dissolution and early-age hydration behaviours, thereby advancing our knowledge of its hydration mechanisms.
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页数：8
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