Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack

Geopolymer (GP) binders are an appealing alternative to Portland cement (PC) binders as they have the potential to reduce the CO2 emissions associated with the cement and concrete industry. However, their durability in aggressive environments needs thorough examination if they are to become a viable...

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Bibliographic Details
Published in:Cement and concrete research 2018-09, Vol.111, p.23-40
Main Authors: Aiken, Timothy A., Kwasny, Jacek, Sha, Wei, Soutsos, Marios N.
Format: Article
Language:English
Subjects:
Acid attack
Acid resistance
Alkali activated cement (D)
Cement
Concrete industry
Degradation (C)
Dosage
Durability (D)
Fly ash
Impact resistance
Materials durability
Microstructure
Microstructure (B)
Porosity
Portland cements
Reaction products
Sulfuric acid
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Summary:Geopolymer (GP) binders are an appealing alternative to Portland cement (PC) binders as they have the potential to reduce the CO2 emissions associated with the cement and concrete industry. However, their durability in aggressive environments needs thorough examination if they are to become a viable alternative to traditional PC materials. This study investigated the effect of increasing slag content and activator dosage on the sulfuric acid resistance of fly ash GP binders. Their performance was also compared with that of neat PC mixes using various physical and microstructural techniques. The results show that increasing the slag content of fly ash GPs decreases porosity, but makes the reaction products more susceptible to sulfuric acid attack. It was also found that increasing the alkaline activator dosage of fly ash GPs has little impact on sulfuric acid resistance. Finally, GP binders displayed superior sulfuric acid resistance than their PC counterparts.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2018.06.011