Study on the preparation and sulfate resistance of Portland cement clinker with the high Fe/Al ratio of ferrite phase

Abstract

The ferrite phase is one of the most important components in Portland cement, which plays an important role in the preparation and sulfate resistance of the clinker. The influences of the ferrite phase with high Fe/Al ratio on the preparation and sulfate resistance of Portland cement clinker was investigated in this paper. The results indicate that the calcination temperature of Portland cement with the ferrite phase with high Fe/Al ratio (HFAPC) clinkers is about 1400 °C. The phase assemblage of the ferrite solid solution in HFAPC clinkers is C6AF2. In addition, the compressive strength of HFAPC samples at 3 d is lower than ordinary Portland cement, whereas its strength at 28 d is higher. HFAPC emerges excellent sulfate resistance compared to ordinary Portland cement at 28 d and 60 d, which is probably due to hydration products of AFm phase is not formed and the stability of Fe-bearing ettringite phase is higher in HFAPC sample. The finding is an important significance to improve the durability of cementitious materials.