2.2.2. Concrete
Concrete mixtures (Table 3) were designed for all the mortar
mixtures of Table 2 containing 40% alkaline liquid. An alkaline
liquid content of 40% was selected based on the previous works
on fly ash based geopolymer concrete [32]. Mixture 2 was designed
with 6% OPC instead of 5% OPC in the corresponding mortar mixture.
Considering average unit weight of fly ash based geopolymer
concretes reported in previous works and trial mixtures tested for
this study, the final unit weight of the concrete was taken as
2420 kg/m3. The total binder content was constant as 400 kg/m3.
The other mixture variables such as percentage of OPC content
and total alkaline solution and ratio of alkaline solutions remained
same as those in the corresponding mortar mixtures.