Cement Chemistry
EFFECT OF THERMAL HISTORY ON THE CRYSTAL STRUCTURE OF STRATLINGITE
2023 Volume 77 Issue 1 Pages 2-8
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2023 Volume 77 Issue 1 Pages 2-8
In this study, we aimed to evaluate the structural changes of stratlingite, which is formed in Roman concrete and cement materials with clay, and stratlingite is considered to contribute significantly to strength and durability of concrete. Specifically, changes in the bonding state of atoms and Al coordination number of stratlingite before and after heating, and dehydration behavior were analyzed and examined. As a result, XRD and Ft-IR showed that the bonds in the main layer are cleaved by heating at 150℃, while those in the interlayer remind. Dynamic TG results indicated that stratlingite undergoes dehydration in three steps：the water molecules in the structure are desorbed, followed by the hydroxyl groups in the main layer, and then the hydroxyl groups in the interlayer.
