The　influence　of　the　concentration　of　sodium　hydroxide　solution　on　the　tensile　bond　strength　of　alkali-activated　slags　(AAS)　used　as　a　tunnel　fireproof　coating　material　was　studied　under　the　simulated　combined　action　of　vibration　and　wind　suction.　A　test　method　involving　the　simultaneous　application　of　vibration　and　suction　was　developed　and　utilized.　The　test　results　indicate　that　as　the　concentration　of　sodium　hydroxide　solution　in　the　AAS　increases　from　1　to　10　weight　percentage,　the　bond　strength　of　AAS　coating　improves　under　the　coupling　action　of　vibration　and　suction.　Furthermore,　the　cumulative　pore　volume　and　the　average　pore　diameter　in　the　AAS　are　reduced　and　the　ratio　of　harmful　pores　to　total　pores　decreases.　As　the　concentration　of　sodium　hydroxide　solution　increases　more　than　10　weight　percentage,　however,　there　is　no　further　benefit　in　terms　of　the　pore　structure　and　bond　strength.　©　Carl　Hanser　Verlag,　München　Materials　Testing.