Since　fiber-reinforced　polymer　(FRP)　composites　possess　excellent　corrosion　resistance,　they　have　great　potential　of　use　with　seawater　sea-sand　concrete　(SSC)　for　the　construction　of　marine　and　coastal　infrastructure.　The　existing　research　on　SSC　columns　confined　with　FRP　jackets,　however,　is　rather　limited.　Most　of　the　limited　research　has　focused　on　the　axial　compressive　behavior　of　SSC　columns　confined　by　conventional　FRP　jackets　(made　from　carbon　and　glass　FRP　composites).　This　paper　presents　results　from　the　first-ever　experimental　study　on　the　behavior　of　axially　loaded　circular　SSC　columns　confined　by　polyethylene　terephthalate　(PET)　FRP　jackets,　which　are　composed　of　a　new　and　more　promising　type　of　FRP　composites　with　a　bilinear　stress-strain　response　and　a　large　rupture　strain.　Parameters　varied　between　the　tests　presented　in　this　paper　included　the　type　and　thickness　of　FRP　jackets　and　the　type　of　mixing　water　used　for　casting　the　SSC.　A　modified　analysis-oriented　model　was　developed　in　which　a　new　dilation　equation　was　proposed　for　the　PET　FRP-confined　SSC.　The　reliability　and　accuracy　of　the　analysis-oriented　model　were　then　examined　by　comparisons　between　the　predicted　results　and　the　test　results　of　the　FRP-confined　SSC.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.