In　this　study,　the　performance　of　superabsorbent　polymers　(SAPs)　as　self-healing　agents　in　macrocracked　ultra-high　performance　concrete　(UHPC)　was　extensively　evaluated,　with　a　focus　on　compressive　strength　behavior　in　different　aggressive　environments.　Three　UHPC　mixtures　were　designed:　a　control　mixture,　a　UHPC　with　0.3　%　sodium　polyacrylate　(poly(AA)),　and　a　UHPC　with　0.3　%　polyacrylate-co-acrylamide　(poly(AA-co-AM)).　Samples　with　macrocrack　widths　of　0.3　mm,　0.5　mm,　and　1　mm,　as　well　as　uncracked　samples,　were　prepared.　The　samples　underwent　immersion　in　deionized　water,　chloride　saltwater,　and　compound　saltwater.　The　performance　of　self-healing　was　evaluated　by　measuring　crack　closure　rates,　recovered　compressive　strength,　and　stereomicroscopic　inspections.　Further,　scanning　electron　microscopy　coupled　with　energy-dispersive　X-ray　spectroscopy　(SEM/EDX)　was　performed　to　monitor　mineral　formation　and　the　healing　process.　The　results　indicate　that　both　poly(AA)　and　poly(AA-co-AM)　SAPs　significantly　enhanced　the　self-healing　capabilities　of　UHPC,　with　poly(AA)　demonstrating　superior　performance.　Self-healing　was　more　pronounced　in　samples　with　cracks　width　of　0.3　mm,　whereas　samples　with　cracks　widths　of　0.5　mm　and　1.0　mm　exhibited　incomplete　and　negligible　healing,　respectively.　The　healed　samples　recovered　a　substantial　portion　of　their　compressive　strength,　regardless　of　the　crack　width.　However,　the　presence　of　chloride　and/or　sulfate　ions　was　found　to　impede　the　self-healing　process.　As　observed　from　the　SEM/EDX　results,　in　addition　to　CaCO3　and　C-S-H　gel,　undesirable　healing　products　like　Friedel＇s　salt　and　ettringite　were　also　formed　in　chloride　and　compound　saltwater　environments　which　significantly　affected　self-healing　durability.　©　2024　Elsevier　B.V.