CO2 Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System

Abstract

Abstract: In view of the problems that CO₂ is easy to corrode Portland cement stone, damage the structural integrity of cement stone and induce interlayer sealing failure, this paper uses slag to modify calcium aluminate cement, and studies the change law of compressive strength of calcium aluminate cement-slag system at 60, 80, 100, 120 ℃ and pure CO₂ conditions. The effect of CO₂ corrosion on hydration products and microstructure of calcium aluminate cement-slag system were investigated by X-ray diffractometer, thermogravimetric analyzer and scanning electron microscopy. The results show that compared with pure calcium aluminate cement stone, the slag transforms the hydration product of calcium aluminate cement stone into C₂ASH₈, which greatly improves the early compressive strength of cement stone.When the mass ratio of calcium aluminate cement to slag is 5 ∶5, the compressive strength of calcium aluminate cement increases by 215.4% after curing at 60 ℃ for 14 d. After CO₂ corrosion, the hydration products of calcium aluminate cement-slag system change from C₂ASH₈ to C₂AS, and CaCO₃ is formed, which increases the density of corrosion layer. The compressive strength of cement stone increases with the increase of corrosion time at same temperature.

Key words: calcium aluminate cement, slag, cementing, CO₂ corrosion, hydration product, microstructure

CLC Number:

TQ172

SHI Wei, GONG Zexiang, LIU Kaiqiang, MA Jiang, WANG Jun, DAI Hong, DENG Lin. CO₂ Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3695-3702.

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CO₂ Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System

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