Presence of OPC accelerated the reaction of geopolymerisation
and helped achieve setting time comparable to that of
traditional cement concrete. Increase of OPC in the fly ash
based geopolymer mixture reduces the workability and
setting time. However the workability and setting time
increased when alkaline liquid content was increased. Mixtures
having alkaline activator solution with sodium silicate
to sodium hydroxide ratio of 2.5 resulted in reduced
setting time and less slump than those with 1.5 and 2.0.