Abstract:Geopolymers was prepared by applying burnt coal cinder (BCC) and granite powder (GP) as main raw materials. When the mass ratio of BCC to GP is 10, ratio of NaOH solution (6 mol/L) to BCC is 0.25 mL/g, ratio of waterglass to BCC is 0.18 mL/g, curing temperature is 60 ℃, and curing with mold for 2 days, the compressive strength (28 d) of the final product obtained after demolding can reach 20.96 MPa. The results show that the influence of NaOH solution on compressive strength of sample is the result of combined effect of multiple factors including dissolution of silica and aluminum, phenomenon of efflorescence and porosity. The addition of waterglass cannot make the mineral composition of sample change obviously, but it can significantly increase the concentration of silicate oligomeric ions in reaction system and increase generation of gels. GP does not show obvious geopolymerization ability under the condition of alkali activation, but it can still play the role of aggregate and filling, improving compressive strength of geopolymer. This study broadens the sources of raw materials for preparation of geopolymers, and provides a reference for utilization of BCC and GP in building materials.