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TitleCompressive strength, microstructure and hydration products of hybrid alkaline cements
Author(s)Abdollahnejad, Zahra
Hlavacek, Petr
Miraldo, Ségio
Torgal, Fernando Pacheco
Aguiar, J. L. Barroso de
KeywordsHybrid alkaline cements
Compressive strength
Issue date2014
PublisherUniversidade Federal São Carlos. Departamento Engenharia Materials
JournalMaterials Research
CitationAbdollahnejad Z., Hlavacek H., Miraldo S., Torgal F. P., Aguiar J. Compressive Strength, Microstructure and Hydration Products of Hybrid Alkaline Cements, Materials Research, doi:10.1590/S1516-14392014005000091, 2014
Abstract(s)Ordinary Portland cement (OPC) is the dominant binder in the construction industry with a global production that currently reaches a total of 3 Gt per year. As a consequence, the cement industry’s contribution to the total worldwide CO2 emissions is of about 7% of the total emissions. Publications on the field of alkali-activated binders (also termed geopolymers), state that this new material is, potentially, likely to become an alternative to Portland cement. However, recent LCA studies show that the environmental performance of alkali-activated binders depends, to great extent, of their composition. Also, researchers report that these binders can be produced in a more eco-efficient manner if the use of sodium silicate is avoided. This is due to the fact that the referred component is associated to a high carbon footprint. Besides, most alkali-activated cements suffer from severe efflorescence, a reaction originated by the fact that the alkaline and/or soluble silicates that are added during processing cannot be totally consumed. This paper presents experimental results on hybrid alkaline cements. The compressive strength results and the efflorescence observations show that some of the new mixes already exhibit a promising performance.
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AccessOpen access
Appears in Collections:C-TAC - Artigos em Revistas Internacionais

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