Resistance to acid attack of alkali-activated binders: Simple new techniques to measure susceptibility

•Two new, simple methods for assessing resistance to acid attack have been proposed.•Low calcium alkali-activated pastes showed the best resistance to acid attack.•Acid neutralisation capacity (ANC) was measured for at pH 7, 4 and 2.•The proposed ANC combined-pH assay is a good alternative for indiv...

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Bibliographic Details
Published in:Construction & building materials 2017-09, Vol.150, p.355-366
Main Authors: Mellado, Ana, Pérez-Ramos, Martha Iris, Monzó, José, Borrachero, María Victoria, Payá, Jordi
Format: Article
Language:English
Subjects:
Acid attack
Acid neutralisation capacity
Alkali-activated binder
Consumed acid
Durability
Mass loss
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Summary:•Two new, simple methods for assessing resistance to acid attack have been proposed.•Low calcium alkali-activated pastes showed the best resistance to acid attack.•Acid neutralisation capacity (ANC) was measured for at pH 7, 4 and 2.•The proposed ANC combined-pH assay is a good alternative for individual tests.•Mass loss and acid consumption were proposed tests for studying monolithic samples. Two rapid tests were developed to evaluate the resistance to acid attack by ordinary Portland cement (OPC) and alkali-activated pastes. Acid neutralisation capacity (ANC) at pH 7, 4 and 2 was monitored with powdered pastes. In parallel, a ‘combined-pH assay’ with a single sample was used to sequentially assess ANC at different pH values. A mass loss/consumed acid monitoring technique has been also developed in order to assess monolithic samples. The OPC paste showed the most degradation. Among the alkali-activated pastes, those with the lowest calcium content (fly ash and spent-FCC catalyst) had the best performance.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2017.05.224