Effect of Alkali Activator on Carbonation Resistance of Single-ComponentAlkali-Activated Nickel Slag Cement Concrete

Abstract

Abstract: Carbonation leads to the decrease of alkalinity of concrete, which seriously harms the durability of reinforced concrete structures. In this paper, Na₂SiO₃, NaOH and Na₂CO₃ were used as alkali activators, and the influences of the types of alkali activators and Na₂O equivalent on the carbonation resistance of single-component alkali-activated nickel slag cement mortar were investigated. The results show that, when the Na₂O equivalent is the same, the carbonation resistance of single-component alkali-activated nickel slag cement mortar is the best in the single doping of NaOH samples, and the carbonation resistance is the worst in the single doping of Na₂SiO₃ samples. Na₂CO₃ partial substitution for Na₂SiO₃ can improve the carbonation resistance of cement mortar samples, while the effect of Na₂CO₃ partial substitution for NaOH on the carbonation resistance of cement mortar specimens is related to the Na₂O equivalent. With the increase of Na₂O equivalent, the carbonation resistance of single doping of Na₂SiO₃ and mixed doping of Na₂SiO₃&Na₂CO₃(3∶1) samples increases first and then decreases. The carbonation resistance of single doping of NaOH samples increases continuously in the early stage, and increases first and then decreases in the later stage. The carbonation resistance of mixed with NaOH&Na₂CO₃ (3∶1) samples improves in the early stage, but decreases in the later stage.

Key words: nickel slag cement, alkali activator, Na₂O equivalent, carbonation resistance, compressive strength, single-component

CLC Number:

TU528.41

WANG Xuefang, ZENG Tianxin, ZHOU Haojie. Effect of Alkali Activator on Carbonation Resistance of Single-ComponentAlkali-Activated Nickel Slag Cement Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 1008-1015.

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