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TitlePerformance of a fly ash geopolymeric based binder with calcium hydroxide, Portland cement and metakaolin as additives
Author(s)Kheradmand, Mohammad
Abdollahnejad, Zahra
Pacheco-Torgal, F.
KeywordsCompressive strength
cost analysis
Fly ash
Mix design
Waste reuse
Issue dateJun-2018
PublisherBentham Science Publishers
JournalThe Open Civil Engineering Journal
CitationKheradmand M., Abdollahnejad Z., Pacheco-Torgal F. Performance of a Fly Ash Geopolymeric Based Binder with Calcium Hydroxide, Portland Cement and Metakaolin as Additives, The Open Civil Engineering Journal, Vol. 12, pp. 1-20, doi: 10.2174/1874149501812010167, 2018.
Abstract(s)Geopolymeric binders are especially indicated when reusing a wide diversity of wastes. This is an important feature, especially in the European context,  in which a circular economy and future zero waste is targeted. Still, the cost of these materials, due to the use of high purity activators, prevents their commercialization as they are simply not competitive enough. The reduction of the amount of activators could be a cost-efficient solution if the associated decrease of the mechanical properties turned not to be excessive. This means that it is important to investigate the manner in which these additives can be used on their composition in order to compensate that mechanical reduction. This paper discloses results concerning the mix design of fly ash based geopolymeric mixtures using metakaolin, Portland cement (OPC) and calcium hydroxide as additives. Their influence on the mechanical properties, microstructure and cost-efficiency was studied. The results showed that the use of  Portland cement as an additive leads to lower compressive strength.  Results also show that geopolymers with different additives have different optimum Na2SiO3/NaOH ratios.
AccessEmbargoed access (2 Years)
Appears in Collections:C-TAC - Artigos em Revistas Internacionais

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