This　work　explores　the　durability　of　alkali-activated　materials　exposed　to　acidic　and　alkaline　environments　to　analyze　and　evaluate　their　applications.　The　alkali-activated　materials　of　metakaolin　and　metakaolin-mine　tailings　were　immersed　in　solutions　of　different　pH　values　for　90　days,　in　which　the　durability　of　materials　was　studied.　Characterizations　include　pH,　FTIR,　XRD,　SEM　and　29Si　NMR　measurements.　It　was　found　that　the　alkali-excited　materials　have　good　durability　in　an　alkaline　environment.　A　small　amount　of　lye　was　diluted　in　the　neutral　solution,　leading　to　a　decrease　in　the　amount　of　gel　and　a　slight　deterioration　of　the　durability　of　the　materials.　Moreover,　alkali-activated　materials　were　corroded　in　acidic　environments,　leading　to　poor　durability　because　hydrogen　ions　(H　thorn　)　attacked　N-A-S-H　and　C-A-S-H　gels,　and　production　of　new　sinjarite　(CaCl2)　mineral　phases.　This　work　provides　a　scientific　reference　value　for　the　application　of　alkaliactivated　materials　in　daily　environment.　(c)　2021　The　Authors.　Published　by　Elsevier　B.V.　This　is　an　open　access　article　under　the　CC　BY-NC-ND　license　(http://creativecommons.org/licenses/by-nc-nd/4.0/).