In this research, the effects of foam content on mechanical property, thermal property and sound absorption of cellular lightweight geopolymer concrete (CLGC) were studied. The geopolymer mixtures were made with 15 M NaOH solution, sodium silicate/NaOH ratio (NS/NaOH) of 1.00, sand/ash ratio of 1.25, liquid/fly ash ratio of 0.4. The foam contents were varied from 2-12 %wt. The 28-day compressive strength of CLGCs of 2.7-57.8 MPa, unit weight of 844-2100 kg/m 3 , water absorption of 1.36-31.25%,

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... porosity of 2.82-49.42%, thermal conductivity of 0.13-1.62 W/mK, and sound absorption coefficients of 0.05-0.5 were obtained. The CLGCs with 4% foam content, 28-day compressive strength of 38.9 MPa and unit weight of 1815 kg/m 3 is suitable for structural lightweight concrete complying to the requirements of ASTM C330/C330M-17a. Whereas the mix with 8 and 10 % foam contents with compressive strengths of 7.60 and 6.1 MPa, and unit weights of 1210 and 1060 kg/m 3 are suitable for use as masonry lightweight concrete block in accordance with ASTM C331/C331M-17.