Corrosion-protection　lining　(CPL)　uses　flexible　high-density　polyethylene　as　an　internal　lining　with　a　high-performance　cement-based　mortar　to　fill　the　gap　between　the　lining　and　the　pipeline.　This　trenchless　rehabilitation　method　effectively　enhances　the　flow　capacity,　corrosion　resistance,　and　sealing　performance　of　water-supply　pipelines.　Quasi-static　tests　were　conducted　on　ductile-iron　(DI)　pipeline　joints　before　and　after　CPL　rehabilitation　under　water　pressure　and　axial　tensile　force.　Key　mechanical　parameters,　such　as　the　tensile　capacity,　tensile　stiffness,　tensile　ductility　coefficient,　and　ultimate　deformation　before　leakage　failure,　were　investigated　in　this　study.　The　test　results　showed　that　the　tensile　capacities　of　the　rehabilitated　DN200　and　DN300　pipeline　joints　increased　to　127.9　kN　and　289.5　kN,　respectively,　and　the　ultimate　joint　opening　corresponding　to　significant　leakage　approximately　doubled　compared　to　unrehabilitated　joints.　The　primary　failure　modes　of　the　mortar　include　bond-slip　failure　between　the　reinforcements　and　mortar,　as　well　as　localized　tensile　cracking　and　detachment　of　the　mortar　caused　by　the　V-shaped　anchors.　The　simplified　mechanical　model　developed　for　the　rehabilitated　pipeline　joints　effectively　captured　the　contributions　of　different　materials　in　the　composite　structure　and　showed　good　agreement　with　the　test　results.　These　findings　demonstrate　that　the　CPL　method　significantly　improves　the　tensile　and　sealing　performance　of　DI　pipeline　joints,　offering　a　reliable　solution　for　extending　pipeline　service　life.　©　2025　Elsevier　Ltd