Pore solution composition and solubility of alkali-activated fly ash

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)

Abstract

Pore solution of hardened alkali-activated fly ash paste was extracted by the steel-die method. The aqueous phase composition of pore solution was analyzed using ICP-OES analysis technique. The results show that the concentrations of Si, Al, Ca, K and OH- decrease with curing time regardless of the curing temperatures (40°C/60°C) and alkaline activators (sodium hydroxide with/without sodium silicate). On the contrary, the concentration of S increases with curing time. A higher temperature curing decreases the solubility of Si, Al, Ca and K in the alkali-activated fly ash, while it doesn’t show much influence on the solubility of S. The plot of the concentration of Al versus the concentration of Si displays a quasi-linear logarithmic relationship. This relationship implies congruent removal of Si and Al from the frameworks of fly ash.

Original languageEnglish
Title of host publicationNon-Traditional Cement and Concrete
PublisherTrans Tech Publications
Pages65-68
Number of pages4
Volume761 KEM
ISBN (Print)9783038354406
DOIs
Publication statusPublished - 2018
Event6th International Conference Non-Traditional Cement and Concrete, 2017 - Brno, Czech Republic
Duration: 19 Jun 201722 Jun 2017
Conference number: 6

Publication series

NameKey Engineering Materials
Volume761 KEM
ISSN (Print)1013-9826

Conference

Conference6th International Conference Non-Traditional Cement and Concrete, 2017
CountryCzech Republic
CityBrno
Period19/06/1722/06/17

Keywords

  • Chemical composition
  • Fly ash
  • Geopolymer
  • Pore solution
  • Solubility

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