Abstract The aim of this experiment is to utilise the locally available industrial waste products to
produce binder for concrete production in order to minimise Portland cement consumption.
This is achieved by using alkali- activated binder known as geopolymer which is embodiment
of mineral polymers obtained from geochemistry. Four geopolymer concrete mixtures were
designed using Fly ash and kaolin as source materials designated as MXX, MX1, MX2 and
MX3 while sodium hydroxide and sodium silicate were used as alkali activators. Portland
cement concrete with the same grade was also prepared to serve as control. Geopolymer
concrete specimens were cured in oven at temperatures of 30oC, 50oC, 70oC,100oC and
120oC respectively. Compressive strength of geopolymer concrete was determined and
compared with that of OPC concrete. The results show that the compressive strengths of
geopolymer concrete was much higher than that of OPC concrete. It was also discovered that
the strength increased with increasing temperature and curing time.
Keywords: Geopolymer, Cement, Concrete, temperature, Fly ash, Compressive strength