Geopolymer　is　an　environmentally　friendly　material　with　fast　setting　time,　high　early　strength,　and　low　cost.　It　shows　promise　as　a　sustainable　alternative　to　traditional　cement-based　grouting　materials.　This　study　proposed　an　alternative　grouting　material　using　a　graphene　oxide　(GO)　reinforced　fly　ash　(FA)　and　ground　granulated　blast　furnace　slag　(GGBS)-based　geopolymer.　This　study　employs　the　central　composite　design　(CCD)　method　within　response　surface　methodology　(RSM)　to　design　an　optimal　mix　proportion　for　the　geopolymer,　considering　the　content　of　fly　ash　in　the　precursor,　the　content　of　graphene　oxide,　the　alkali　activator　modulus,　and　the　alkali　content　as　influencing　factors.　The　effects　of　these　four　factors　and　their　interactions　on　the　fluidity,　initial/final　setting　time,　and　compressive　strength　at　different　curing　ages　of　geopolymer　are　discussed.　Microstructural　analysis　(XRD,　SEM)　is　conducted　to　illustrate　the　mechanism　underlying　the　strength　enhancement　of　this　grouting　material.　The　results　indicate　that　RSM-CCD　can　accurately　optimize　the　mix　proportion　of　geopolymer.　Considering　both　the　strength　development　and　workability　of　the　slurry,　the　optimal　proportion　was　determined　to　be　20　wt%　fly　ash　content,　0.027　%　graphene　oxide　content,　an　alkali　content　of　7,　and　a　modulus　of　1.2.　Under　these　conditions,　the　28day　compressive　strength　can　reach　80.41　MPa,　which　represents　a　19.52　%　increase　compared　to　the　group　without　GO.　Under　the　influence　of　an　activator　with　a　moderate　modulus　and　alkali　equivalent,　the　synergistic　effect　of　fly　ash　and　graphene　oxide　(GO-FA)　can　effectively　improve　the　fluidity　and　setting　time　of　the　slurry,　facilitating　the　formation　of　a　well-structured,　dense,　and　mechanically　robust　spatial　structure　in　the　geopolymer　grouting　material.　The　optimal　proportion　proposed　in　this　study　can　serve　as　a　basis　and　reference　for　the　engineering　application　of　geopolymer　grouting　materials.　©　2025