Designation:C305−14AmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:T162StandardPracticeforMechanicalMixingofHydraulicCementPastesandMortarsofPlasticConsistency1ThisstandardisissuedunderthefixeddesignationC305;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversthemechanicalmixingofhydrauliccementpastesandmortarsofplasticconsistency.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C511SpecificationforMixingRooms,MoistCabinets,MoistRooms,andWaterStorageTanksUsedintheTestingofHydraulicCementsandConcretesC778SpecificationforSand3.SignificanceandUse3.1Thispracticeisintendedforuseinthemechanicalmixingofpastesandmortarsforthetestingofhydrauliccements.4.Apparatus4.1Mixer—Themixershallbeanelectricallydrivenme-chanicalmixeroftheepicyclictype,whichimpartsbothaplanetaryandarevolvingmotiontothemixerpaddle.Themixershallhaveaminimumoftwocontrolledspeeds.(Rheo-statadjustmentofspeedisnotacceptable.)Thefirst,orslowspeedshallrevolvethepaddleatarateof14065r/min,withaplanetarymotionofapproximately62r/min.Thesecondspeedshallrevolvethepaddleatarateof285610r/min,withaplanetarymotionofapproximately125r/min.Theelectricmotorshallbeatleast124W(1⁄6hp).ThemixershallbeequippedwitheitheranadjustmentscrewwhichisanintegralpartofthemixeroraclearanceadjustmentbracketsuchastheoneshowninFig.1(Note1)toprovideclearancebetweenthelowerendofthepaddleandthebottomofthebowlthatisnotgreaterthan2.5mmbutnotlessthan0.8mm(No...
