Chemical aspects related to using recycled geopolymers as an aggregate

Napoleana-Anna Chaliasou, Andrew Heath, Kevin Paine

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Geopolymer cements are alternative binders for concrete with low CO2 footprint and distinct chemical composition. They consist of aluminosilicate macromolecules and have a highly alkaline matrix due to the activating solutions used for their production. This paper is based on a study examining the recyclability of fly ash-slag based geopolymer paste as fine recycled concrete aggregate (RCA) in Portland cement and geopolymer mortars. Given the intrinsic structure of geopolymers, leaching of chemical substances from the RCA into the new paste was considered possible. SEM images and elemental mapping of the hardened mortars were used to evaluate the effect of RA. The potential of alkali silica reaction occurrence and the effect of RA extract on the initial setting time of cement were examined.
Original languageEnglish
Publication statusPublished - Sept 2016
Event36th Cement and Concrete Science Conference
- Welsh Academy of Music and Drama - Cardiff University, Cardiff, United Kingdom
Duration: 5 Sept 20166 Sept 2016
Conference number: 36


Conference36th Cement and Concrete Science Conference
Abbreviated title36CCS
Country/TerritoryUnited Kingdom
Internet address


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