Ceramics-Silikáty

This study systematically investigates the effects of sodium water glass with a different modulus (1.0, 1.3, 1.6) on the early age strength, alkali activation characteristics, and microstructure of fly ash based geopolymer concrete (FABGC). The results show that as the modulus of sodium water glass increases, the compressive strength of FABGC first increases and then decreases, and the total heat release of the alkali activated system gradually decreases. Although the modulus of sodium water glass has no significant effect on the phase types of FABGC, it has a significant impact on the carbonate content in FABGC. The cumulative pore volume of FABGC first decreases and then increases with the increase of modulus of sodium water glass, and the modulus of sodium water glass has a significant impact on the different pore ratios. In summary, when the modulus of sodium water glass is 1.3, FABGC has a relatively dense microstructure, and its early-age performance is excellent.