Ultra-high　performance　glass　sand　concrete　(UHPGC)　is　a　new　composite　material　with　superior　mechanical　properties　and　durability　made　by　replacing　quartz　sand　in　traditional　ultra-high　performance　concrete　(UHPC)　with　environmentally　friendly　and　economical　glass　sand　recycled　from　waste　glass.　This　study　investigated　the　flexural　and　fracture　characteristics　of　UHPGC　notched　beams　with　prefabricated　notches　at　three　different　locations　(mid-span,　100　mm　off　mid-span　and　145　mm　off　mid-span)　using　four-point　bending　tests.　Meanwhile,　the　damage　evolution　processes　of　notched　beams　under　flexural　load　were　monitored　in　real　time　and　characterized　by　acoustic　emission　(AE)　technology.　Fracture　modes　were　automatically　classified　based　on　Gaussian　mixture　model　(GMM)　and　support　vector　machine　(SVM)　of　rise　angle　(RA)　and　average　frequency　(AF).　Outlier　analysis　of　b-value　were　applied　to　provide　a　warning　prior　to　complete　failure　of　UHPGC　notched　specimen.　The　results　revealed　that　notched　position　presents　significant　effects　on　flexural　strength,　flexural　toughness　and　fracture　energy,　and　exhibit　considerable　influence　on　AE　parameters　and　cracking　patterns.　The　farther　the　notch　is　away　from　the　mid-span,　the　greater　the　flexural　strength,　flexural　toughness　and　fracture　energy　exhibit　due　to　the　weakened　stress　concentration.　As　it　takes　longer　to　gather　enough　strain　energy　at　the　tip　of　the　notch　to　crack,　AE　monitoring　shows　that　higher　amplitude　and　hysteretic　nature　of　AE　parameters　such　as　accumulated　energy　and　information　entropy,　etc.,　can　be　recorded　as　notch　position　away　from　the　mid-span.　The　farther　the　notch　is　away　from　mid-span,　the　more　shear　cracks　predominate　at　the　later　stages　of　damage.　Cumulative　AE　energy　and　fracture　energy　throughout　the　damage　process　are　found　to　exhibit　a　favorable　exponential　relationship.　In　addition,　the　b-value　outlier　analysis　can　provide　failure　warning　for　UHPGC　notched　beams.　This　study　is　of　great　significance　in　exploring　the　fracture　behavior　of　UHPGC　and　providing　reference　for　engineering　applications　related　to　UHPGC　failure.　©　2023　The　Author(s)