In　this　study,　seawater,　sea　sand　and　recycled　coarse　aggregate　(RCA)　are　combined　to　prepare　seawater　sea　sand　recycled　aggregate　concrete　(SSRAC)　for　use　in　beams.　Nine　beams　are　reinforced　with　glass　fiber　reinforced　polymer　(GFRP)　bars,　while　2　more　beams　are　reinforced　with　steel　bars　for　comparison.　Unlike　reinforced　concrete　(RC)　beams　that　contain　steel　bars,　SSRAC　beams　reinforced　with　GFRP　bars　(GFRP-SSRAC)　are　less　stiff　and　ductile.　For　GFRP-SSRAC　beams　with　a　certain　shell　particle　content　in　this　study,　the　use　of　seawater　and　sea　sand　in　concrete　decreases　the　cracking　load.　The　ultimate　load　is　smaller　overall　for　GFRP-SSRAC　beams　than　RC　beams　with　the　same　reinforcement　ratio.　The　predictions　of　flexural　capacities　made　using　the　ACI　code　are　all　lower　than　the　test　results.　When　the　replacement　ratio　of　RCA　is　100%,　the　predictions　for　RAC/SSRAC　beams　using　the　Chinese　code　are　lower　than　the　measured　values.　Finally,　the　measured　stressstrain　curves　of　SSRAC　and　GFRP　bars　are　used　to　obtain　the　moment-curvature　relationships　according　to　reinforcement-based　and　concrete-based　calculation　methods.　These　calculations　and　results　are　discussed　in　this　paper.　©　The　Author(s)　2023.