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In: Pacheco-Torgal F., Labrincha J.A., Leonelli C., Palomo A., Chindaprasirt P., editors. 25-Life cycle assessment (LCA) of alkali-activated cements and concretes. A life-cycle assessment of Portland cement manufacturing: Comparing the traditional process with alternative technologies. Strength properties beyond 28 days are considered as the long-term strength.ĭensity efflorescence formation long-term strength one-part alkali-activated binders properties.
#Uf civil engineering Activator#
At longer age of curing, mixtures with a higher dosage of powdered activator tend to absorb less water.
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The initial dissolution of the OPAAP occurred within the first 30 min. The larger pore size promotes the crystallization of the resulting hydrate substances (N, C)-A-S-H gel. Field emission scanning electron microscope (FESEM) micrograph revealed uniformly formed solid matrices with the micro-crack present were observed in the samples. The absorption of water decreases with an increase in the activator dosage from 8-12%, and beyond that, the water absorption relatively remains the same. The pastes were found to exhibit good soundness characteristics over the long-term. The compressive strength of the OPAAP is well correlated with its hardened density.
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The experimental result revealed that the binders exhibited excellent long-term strength properties. The properties examined are hardened density, compressive strength, flexural strength, water absorption, efflorescence formation, and microstructural analysis. Powdered sodium metasilicate activator was utilized in the range of 8-16% by weight of the fly ash in producing the OPAAB. This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions.