Chemical aspects related to using recycled geopolymers as an aggregate

Napoleana Chaliasou, Andrew Heath, Kevin Paine

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

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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
Title of host publication36th Cement and Concrete Science conference
EditorsGary Perkins
Place of PublicationCardiff
PublisherCementitious Materials Group, Institute of Materials, Minerals and Mining
ISBN (Print)1-86125-175-0, 978-1-86125-175-6
Publication statusPublished - 5 Sep 2016
Event36th Cement and Concrete Science Conference - Welsh Academy of Music and Drama, Cardiff University , Cardiff, UK United Kingdom
Duration: 5 Sep 20166 Oct 2016


Conference36th Cement and Concrete Science Conference
Abbreviated title36CCS
Country/TerritoryUK United Kingdom


  • geopolymer
  • recycled aggregates
  • Scanning electron microscopy (SEM)
  • Elemental analysis
  • alkali aggregate reactions

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science (miscellaneous)
  • Waste Management and Disposal
  • Building and Construction


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