Geopolymer is a new type of inorganic polymer resulting from the reaction of
alkali metal solutions and alumino-silicate containing of fine particles such as fly ash.
Because of the low carbon dioxide by-product and fly ash utilization, which is a
waste material, geopolymer has been attractively looked upon as an alternative
sustainable development of construction material. In this study, the effects of alkali
solution ratio and curing temperature on the properties of fly ash based geopolymer
were investigated. The 7 mole ratios of sodium silicate and sodium hydroxide, Ms,
were selected, ranging from 0.20-0.50. The fly ash contents were 60, 65 and 70
percents by weight, and the curing temperatures were 30, 40 and 50oc. The results
indicated that decreasing the Ms value and increasing the curing temperature
significantly increased the compressive strength of the fly ash based geopolymer
mortar. The most beneficial effect of fly ash content 70 % which curing temperature
at 40oc. Furthermore, an increase in curing temperature of fly ash based geopolymer
reported in minor change of mass after acid treatment. Thus, fly ash based
geopolymer has a high potential for utilization in construction work as it facilitates the
use of industrial waste materials.