Influence of alkaline activators on the mechanical properties of fly ash based geopolymer concrete cured at ambient temperature

By M. T. Ghafoor, Q. Khan, A. Qazi, M. Sheikh, M. Hadi. 2020

193 citations recorded by the source corpus.

Abstract In this study, cement-free geopolymer concrete (GPC) mixes are prepared using locally produced fly ash with varying NaOH concentrations (8 M−16 M), Na2SiO3/NaOH ratios (1.5–2.5) and alkaline activator to fly ash (AA/FA) ratios (0.4–0.6) to investigate the influence of alkaline activators on the mechanical properties of GPC cured at ambient temperatures. The optimum compressive strength (21.5 MPa) of ambient-cured GPC was attained with NaOH concentration of 14 M, Na2SiO3/NaOH of 1.5 and AA/FA of 0.5. The optimum flexural strength (5 MPa) of ambient-cured GPC was attained with NaOH concentration of 16 M, Na2SiO3/NaOH of 1.5 and AA/FA of 0.5.

Subfields: Ceramics and Composites, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/2e563dcbcd3b9af3737e60ee181e390c4ad0c5ca