TITLE:
Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)
AUTHORS:
Seick Omar Sore, Adamah Messan, Elodie Prud’Homme, Gilles Escadeillas, François Tsobnang
KEYWORDS:
Geopolymer, NaOH, KOH, Metakaolin, Rice Husk Ash, Compressive Strength
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.8 No.6,
October
22,
2020
ABSTRACT: This
study specifically investigated the influence of the composition of
aluminosilicate material i.e. the substitution of metakaolin by rice husk ash and the nature
of alkaline activators (Na+/K+)
on mineralogical, structural, physical and mechanical properties of geopolymer
binders. This influence was evaluated based on X-ray diffraction (XRD), Fourier
Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscope (SEM
analyses, apparent density, water accessible porosity, compressive strength and
thermal properties. Two types of geopolymer binder were synthesized according
to the type of alkali activator used, the NaOH-based geopolymer and the
KOH-based geopolymer. The results of characterization performed after 14 days
of curing of geopolymer samples showed that the activation of the
aluminosilicate powder using alkaline solution led to change in their microstructure. The highest compressive strength was
obtained with the NaOH-based geopolymer.