Fiber-reinforced　concrete　(FRC)　with　natural　sand　(NS)　as　fine　aggregate　has　been　regarded　as　an　favorable　cementitious　composites　in　engineering　application　due　to　its　superior　mechanical　and　fracture　properties,　etc.　As　a　promising　substitution　for　NS　in　conventional　concrete,　manufactured　sand　(MS)　presents　great　potential　in　minimizing　environmental　impacts　and　increasing　economic　benefits.　This　paper　presents　the　effects　of　fiber　type　(steel　fiber,　basalt　fiber,　glass　fiber),　fiber　content　(0　%,　1　%,　2　%)　and　fiber　length　(6　mm,　13　mm,　20　mm)　on　mechanical　and　fracture　characteristics　of　manufactured　sand　concretes　(MSCs)　with　100　%　replacement　ratio　of　NS　with　MS.　The　entire　fracture　processes　of　MSCs　were　monitored　using　acoustic　emissions　(AE)　in　real　time.　The　results　showed　that　flexural　strength　of　MSC　increases　with　the　addition　of　three　different　fibers,　and　steel　fiber　exhibits　the　best　reinforcement　effect.　MSC　with　1　%　steel　fiber　content　exhibits　the　highest　flexural　strength.　Meanwhile,　the　longer　the　fiber　length　is,　the　smaller　the　flexural　strength　presents.　The　effects　of　fiber　properties　on　AE　parameters　(count,　b-value,　information　entropy)　revealed　that　the　addition　of　fibers　reduces　the　fluctuation　of　counts　and　information　entropy.　The　MSC　with　2　%　steel　fiber　content　exhibits　more　dramatic　fluctuations　of　b-value　and　information　entropy　after　post-peak,　which　reveals　greater　internal　damage　in　specimen.　The　longer　the　steel　fiber　is,　the　more　dramatic　the　AE　signal　fluctuations　and　the　more　severe　the　damage　inside　the　specimen　emerge.　Parametric　analysis　of　rise　angle　(RA)　and　average　frequency　(AF)　for　classifying　fracture　modes　(tensile　and　shear　cracks)　show　that　the　incorporation　of　fibers　can　reduce　the　tensile　cracks　of　MSC　specimen　under　four-point　bending.　With　the　increase　of　fiber　content,　the　tensile　cracks　first　decrease　and　then　increase.　The　longer　fiber　length　is,　the　more　tensile　cracks　generate　during　the　fracture　process.　©　2023　Elsevier　Ltd