The　sulfate-rich　sewage　sludge　ash　(SRSSA)　could　be　recycling　used　as　expansive　agents　in　self-leveling　cement　mortars,　and　superabsorbent　polymers　(SAP)　can　effectively　reduce　the　shrinkage　of　cement-based　materials.　Therefore,　SRSSA　and　SAP　were　used　as　admixtures　to　prepare　self-leveling　cement　mortars.　The　influences　of　SRSSA　and　SAP　on　the　fluidity,　strength,　drying　shrinkage,　crack　resistance　and　microstructure　of　self-leveling　cement　mortars　were　studied.　The　initial　fluidity　and　20-min　fluidity　of　self-leveling　cement　mortars　were　slightly　reduced　when　SRSSA　and　SAP　were　added.　The　flexural　strength　and　compressive　strength　of　self-leveling　cement　mortars　improved　when　the　SRSSA　content　was　lower　than　6　%　of　binders,　and　the　strengths　were　reduced　when　SRSSA　were　added　by　8　%　and　10　%.　The　addition　of　SAP　further　reduced　the　strengths　of　self-leveling　cement　mortar.　The　drying　shrinkage　of　self-leveling　cement　mortars　decreased　when　SRSSA　was　added　as　expansive　agents,　and　the　added　SAP　further　reduced　the　drying　shrinkage.　The　addition　of　SRSSA　postponed　the　initial　cracking　time　and　improved　the　crack　resistance　of　self-leveling　cement　mortars.　When　SAP　was　added　together,　the　crack　resistance　of　self-leveling　cement　mortars　became　better.　The　formation　of　ettringite　in　self-leveling　cement　mortars　was　promoted　by　the　presence　of　SRSSA　and　SAP,　and　the　addition　of　SAP　with　SRSSA　also　reduced　the　porosity　tested　with　mercury　intrusion　porosimeter.　Generally,　SRSSA　can　be　used　as　expansive　agents　in　self-leveling　cement　mortars,　which　is　a　new　method　to　recycle　use　SRSSA　in　cement-based　materials.　©　2025　Elsevier　Ltd