Abstract
Dicalcium ferrite (C2F) is a key component in metallurgical slag, particularly steel slag. Nevertheless, its influence on cement hydration is unclear. This study investigated the composition and surface properties of synthesized C2F and its effects on the compressive strength, hydration heat, hydration degree, and microstructure of blended cement. The results indicated that C2F comprises small lamellar particles. Its incorporation into Portland cement reduces the hydration rate and cumulative hydration heat of blended cement. Despite its low hydration capacity, C2F actively engages in cement hydration, reacting with C-S-H, C4Ac0.5H12, and C4AcH11 to form C3(AF)S0.84H. Furthermore, the loose, lamellar structure of C2F reduces the compactness of the microstructure in blended cement paste. Consequently, C2F imposes a more substantial retarding effect on cement hydration than inert SiO2. This investigation contributes novel theories and insights into the retarding effect of steel slag on cement hydration.
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