With　the　global　construction　industry　in　full　swing　and　the　desperate　quest　to　reduce　energy　consumption　and　greenhouse　gas　emissions,　there　is　a　growing　demand　for　new　technologies　to　manufacture　lightweight　concrete　structures.　This　work　focuses　on　foam　concrete　(FC)　and　presents　the　initial　results　of　current　experimental　campaigns.　The　purpose　of　this　paper　is　to　investigate　the　relationship　between　the　flow,　mechanical　strength,　and　elastic　modulus　of　the　samples　and　the　different　dry　densities,　and　the　fine　aggregate　sizes.　All　samples　were　cured　in　water　to　maintain　a　constant　temperature　and　humidity　environment.　The　target　density　of　the　specimens　ranged　from　1350　to　1600　kg/m3　with　two　grades　of　fine　aggregate　size.　The　findings　indicate　that　while　the　increase　in　dry　density　reduces　the　flow　of　the　foamed　concrete　specimens,　the　increase　in　fine　aggregate　diameter　greatly　improves　the　flowability　of　the　foamed　concrete　when　compared　to　the　control　group.　Furthermore,　the　mechanical　strength　of　foamed　concrete　was　enhanced　by　smaller　fine　sand　gradation　because　of　the　presence　of　more　refined　pore　structure　and　improved　bubble　stability.　In　particular,　the　foamed　concrete　specimen　with　finer　sand　particle　size　had　a　maximum　compressive　strength　value　of　around　45　MPa　and　an　elastic　modulus　of　about　18　GPa　at　a　dry　density　of　about　1600　kg/m3.　©　2024　IEEE.