Abstract
Tetracalcium aluminoferrite (C4AF) presents in ordinary Portland cement (OPC) as a solid solution phase, as C4AxF2−x (0.7 ≤ x ≤ 1.1). There is a limited understanding of the hydration reactions of C4AF, particularly regarding the influence of alkanolamines (AA) on C4AF, which can substantially alter OPC hydration. In this study, synthesized C4A0.81F1.19 was subjected to grinding, using three different AA (triisopropanolamine, ethanol diisopropanolamine, and diethanol isopropanolamine) at dosages of 0, 0.1, and 0.3%. It was experimentally confirmed that the crystal structure of unhydrated C4AF was partially changed during the grinding process, and the hydration properties of C4AF were modified. From these results, the compressive strength improved significantly, and the rate of strength enhancement was the highest with 0.1% of diethanol isopropanolamine. More specifically, it was revealed that both Fe and Al sources were proficiently activated, leading to the production of Al/Fe-containing AFm phases and efficiently enhanced mechanical properties.
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