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A platform for research: civil engineering, architecture and urbanism
Effects of alkali activator on the carbonation of one-part alkali-activated nickel slag cement
To study the effects of ion type and dosage of alkali activators on the carbonation of one-part alkali-activated nickel slag (OAANS) mortar, NaOH, Na2SiO3, NaOH+Na2SiO3, KOH, and KOH+Na2CO3 were used as activators. The carbonation depth, compressive strength, and microstructure (via MIP, XRD, and FTIR) were analyzed. Results show that OAANS mortar with K+ as the cation has significantly lower carbonation resistance than those with Na+. Compressive strength with K+ decreases initially after carbonation, then increases, while strength with Na+ grows rapidly early and slows later. With the same cation, mortars with OH− exhibit higher strength than those with after 28 days of carbonation. Increasing alkali dosage promotes hydration, reduces porosity, and enhances carbonation resistance, with effects depending on the alkali activator type.
The effects of alkali activators and alkali equivalent on the anti-carbonation properties of one-part alkali-activated nickel slag cement were investigated.
The type of cation in alkali activators significantly affects the carbonation resistance of OAANS mortar, with Na+ providing better resistance than K+
Increasing the dosage of alkali activators enhances the carbonation resistance of OAANS mortar by promoting more hydration and forming a denser internal structure.
Effects of alkali activator on the carbonation of one-part alkali-activated nickel slag cement
To study the effects of ion type and dosage of alkali activators on the carbonation of one-part alkali-activated nickel slag (OAANS) mortar, NaOH, Na2SiO3, NaOH+Na2SiO3, KOH, and KOH+Na2CO3 were used as activators. The carbonation depth, compressive strength, and microstructure (via MIP, XRD, and FTIR) were analyzed. Results show that OAANS mortar with K+ as the cation has significantly lower carbonation resistance than those with Na+. Compressive strength with K+ decreases initially after carbonation, then increases, while strength with Na+ grows rapidly early and slows later. With the same cation, mortars with OH− exhibit higher strength than those with after 28 days of carbonation. Increasing alkali dosage promotes hydration, reduces porosity, and enhances carbonation resistance, with effects depending on the alkali activator type.
The effects of alkali activators and alkali equivalent on the anti-carbonation properties of one-part alkali-activated nickel slag cement were investigated.
The type of cation in alkali activators significantly affects the carbonation resistance of OAANS mortar, with Na+ providing better resistance than K+
Increasing the dosage of alkali activators enhances the carbonation resistance of OAANS mortar by promoting more hydration and forming a denser internal structure.
Effects of alkali activator on the carbonation of one-part alkali-activated nickel slag cement
Wang, Xuefang (author) / Que, Yuanhao (author) / Wang, Shengxian (author) / Kang, Sixiang (author) / Zheng, Wenquan (author) / Xu, Liwei (author) / Wu, Wenda (author)
Journal of Sustainable Cement-Based Materials ; 14 ; 627-644
2025-04-03
18 pages
Article (Journal)
Electronic Resource
English
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