In　this　paper,　the　resistance　of　mechanically　prepared　one-part　alkali-activated　materials　to　external　sulfuric　acid　attack　was　investigated　by　simulating　realistic　erosion　environments　in　terms　of　sulfate　type,　concentration,　and　erosion　mode.　The　macroscopic　properties　of　the　specimens　were　measured　at　different　ages.　Microscopic　analyses　were　performed　by　Fourier-transform　infrared　spectroscopy　(FTIR),　X-ray　diffraction　(XRD),　mercury　intrusion　porosimetry　(MIP),　and　other　techniques　to　obtain　the　effect　of　different　erosion　environments　on　the　mechanical-force　chemically　prepared　one-part　alkali-activated　materials　against　sulfate　erosion.　The　study　shows　that　the　mechanical　properties　of　the　specimens　showed　a　trend　of　increasing　and　then　decreasing　with　the　extension　of　erosion　time.　Compared　with　Na2SO4　erosion,　the　erosion　damage　was　greatest　when　the　sulfate　containing　Mg2+　was　eroded　in　a　wetting-and-drying　cycle;　the　erosion　products　of　Na2SO4　solution　coexist　in　the　form　of　calcite　and　gypsum,　while　the　erosion　products　of　MgSO4　solution　mainly　consist　of　gypsum.　Copyright　©　2023,　American　Concrete　Institute.　All　rights　reserved.