Alkaline solution/binder ratio as a determining factor in the alkaline activation of aluminosilicates

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Synthesis and strength optimization of one-part geopolymer based on red mud (2016, background): “It is well known that an decrease in the water/solid ratio would decrease the porosity and increase the compactness of the material as well as the mechanical strength [29].”
Sulfuric acid resistance of blended ash geopolymer concrete (2013, result): “This was consistent with the removal of free evaporable water which was present in the pores of the gel products, either C–S–H type or N–A–S–H (zeolite-like) gels [24].”
Effect of GGBFS on setting, workability and early strength properties of fly ash geopolymer concrete cured in ambient condition (2014, background): “This promotes an increase of poorly polymerized reaction products [44].”
Optimum mix design of geopolymer pastes and concretes cured in ambient condition based on compressive strength, setting time and workability (2019, background): “This is due to the fact that excess alkaline solution increase the amount of water in the mix which 272 hindered geopolymerization [36].”
Performance of blended ash geopolymer concrete at elevated temperatures (2015, background): “carbonate in the system is characterized by absorption at 1,425 cm, which is consistent with the presence of anorthite and calcite particularly in OPC samples [22, 23].”