Effect of Iron Phase Component on Hydration Performance and Corrosion Resistance of Iron Phase and High-Iron Low-Calcium Cement Clinker

Abstract

Abstract: With the development of marine construction engineering, a large number of cement-based materials have been applied to marine construction, and the impact of the marine environment on cement-based materials has also attracted more and more attention. Studies have shown that the iron phase in cement has good corrosion resistance, and the Al/Fe mole ratio of the iron phase is the main factor affecting the corrosion resistance of the iron phase. This paper designed and burned two kinds of iron phase single ore C₄AF and C₆A₂F (Al/Fe mole ratio were 1 and 2 respectively), and the high-iron low-calcium cement clinker with iron phase only containing C₄AF or C₆A₂F (the iron phase mass fraction were both 20%). Through X-ray diffraction, heat of hydration, compressive strength, resistance to sulfate attack and ability to cure chloride ion, the iron phase single ore C₄AF and C₆A₂F and the corresponding high-iron low-calcium cement clinker were tested to study Al/Fe mole ratio influence on the properties of iron phase single ore and high-iron low-calcium cement clinker. The results show that with the increase of Al/Fe mole ratio, the interplanar spacing of the iron phase becomes less, the chloride ion solidification ability is enhanced, and the sulfate corrosion resistance is reduced. At the same time, the increase of the iron phase content in the clinker promotes the hydration of C₃S, and the iron phase with high Al/Fe mole ratio has a better promotion effect. As the Al/Fe mole ratio of the iron phase increases, the chloride ion solidification ability of the cement clinker increases, while the sulfate corrosion resistance decreases less.

Key words: iron phase component, high-iron low-calcium cement clinker, hydration performance, chloride ion solidification, sulfate corrosion resistance

CLC Number:

TU528

GAO Jinrui, RAO Meijuan, ZHANG Kechang, DENG Qingshan. Effect of Iron Phase Component on Hydration Performance and Corrosion Resistance of Iron Phase and High-Iron Low-Calcium Cement Clinker[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1097-1102.

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