The present experimental programme investigates the effect of synthesising parameters on engineering properties of locally available low calcium fly ash based geopolymer composites. On effect of parameters such as molarity of NaOH, curing temperature along with curing period on geopolymer mortar was studied. It is found that as the concentration of NaOH, curing temperature and with curing period increased, geopolymer mortar compressive strength was increased. © IAEME Publication.