Two　different　types　of　sulfuric　acid,　chemical　sulfuric　acid　(CSA)　and　biogenic　sulfuric　acid　(BSA)　produced　by　T.f　bacteria　(Thiobacillus　ferrooxidans),　were　applied　into　the　simulation　of　the　corrosion　of　alkali-activated　concrete　(AAC).　Compared　with　CSA　corrosion,　three　sulfuric　acid　concentrations　(pH　=　1.1,　1.6　and　2.0)　were　used　to　study　the　degradation　of　AAC　under　the　BSA　corrosion.　In　this　paper,　the　change　of　appearance,　compressive　strength,　Ca2+　emission,　the　environmental　scanning　electron　microscope-energy　dispersive　spectroscopy　(ESEM-EDS),　X-ray　diffraction　(XRD)　and　nuclear　magnetic　resonance　(NMR)　respectively　were　used　to　study　the　deterioration　mechanism　of　AAC　under　BSA　attack.　The　result　of　the　experiment　revealed　that　BSA　was　more　corrosive　to　AAC　than　CSA.　However,　with　the　impact　of　different　concentrations　of　CSA　and　BSA,　the　product　of　corrosion　of　the　AAC　was　still　mainly　gypsum.　Therefore,　BSA　merely　accelerated　the　corrosion　rate　and　did　not　transform　the　corrosion　mechanism.　Additionally.　AAC　less　affected　by　bacteria,　the　degree　of　corrosion　of　the　AAC　is　mainly　influenced　by　the　concentration　of　sulfuric　acid.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.