In　this　paper,　the　feasibility　of　glass　fiber　reinforced　polymer　(GFRP)　bar　reinforced　recycled　concrete　beams　with　seawater　sea　sand　was　investigated.　A　four-point　flexural　test　was　carried　out,　and　the　Digital　Image　Correlation　(DIC)　technique　was　applied　to　measure　strain　and　deflection　of　beam　at　the　same　time.　The　cracking　load　was　calculated　and　compared　with　the　test　data,　and　the　deformability　and　instantaneous　stiffness　were　also　calculated　as　a　further　supplement　to　the　evaluation　of　the　service　performance　of　the　beams.　The　test　results　showed　that　the　crack　development　and　failure　pattern　of　the　GFRP　bar　reinforced　recycled　concrete　beams　with　seawater　and　sea　sand　(SSRAC　beams)　did　not　change　significantly　compared　with　the　steel　reinforced　concrete　beams,　but　became　more　ductile　due　to　sea　sand.　The　overall　deflection　of　the　beam　reinforced　with　GFRP　bars　increased　but　was　still　within　the　allowable　range　of　the　current　code　(ACI　318–05　and　GB　50010-2010),　but　the　cracking　load　decreased　significantly.　There　was　no　significant　difference　in　the　performance　of　beams　using　various　fine　aggregates　in　most　cases.　However,　the　excessive　amount　of　shell　particles　had　the　potential　to　change　the　failure　patterns　and　deformability　factors　of　the　beams.　Overall,　there　was　no　significant　degradation　in　the　serviceability　of　SSRAC　beams　reinforced　by　GFRP　bars.　©　2023　Elsevier　Ltd