【英文标准名称】:StandardTestMethodforDeterminationofRelativeDensityandAbsorptionofFine,CoarseandBlendedAggregateUsingCombinedVacuumSaturationandRapidSubmersion
【原文标准名称】:利用相结合的真空饱和和快速浸没法测定细集料、粗集料和混合料的相对密度和吸水率的标准试验方法
【标准号】:ASTMD7370-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D04.51
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorption;aggregate;apparentdensity;apparentrelativedensity;blendedaggregate;coarseaggregate;combinedaggregate;density;fineaggregate;relativedensity;specificgravity;Absorption;Aggregate(blended);Aggregate(coarse);Aggregate(fine)
【摘要】:Relativedensity(specificgravity)isthecharacteristicgenerallyusedforcalculationofthevolumeoccupiedbytheaggregateinvariousmixturescontainingaggregate,includingPortlandcementconcrete,bituminousconcrete,andothermixturesthatareproportionedoranalyzedonanabsolutevolumebasis.Relativedensity(specificgravity)isalsousedinthecomputationofvoidsinaggregateinTestMethodC29/C29M.Relativedensity(specificgravity)saturatedsurfacedry(SSD)isusediftheaggregateisatSSD,thatis,ifitsabsorptionhasbeensatisfied.Conversely,therelativedensity(specificgravity)oven-dry(OD)isusedforcomputationswhentheaggregateisdryorassumedtobedry.Apparentdensityandapparentrelativedensity(apparentspecificgravity)pertaintothesolidmaterialmakinguptheconstituentparticlesnotincludingtheporespacewithintheparticleswhichisaccessibletowater.Absorptionvaluesareusedtocalculatethechangeinthemassofanaggregateduetowaterabsorbedintheporespaceswithintheconstituentparticles,whenitisdeemedthattheaggregatehasbeenincontactwithwaterlongenoughtosatisfytheabsorptionpotential.Thelaboratorystandardforabsorptionisthatobtainedaftersubmergingdryaggregateforaprescribedperiodoftime.Note18212;Thereareothertestmethodsthathavebeenusedandcontinuetobeusedtodeterminetheseaggregateproperties:C127andC128.Thistestmethodmayresultinvaluesforthesepropertiesthatareclosetoordivergentfromvaluesfromothertestmethods.Note28212;Thequalityoftheresultsproducedbythisstandardaredependantuponthecompetenceofthepersonnelperformingtheprocedureandthecapability,calibration,andthemaintenanceoftheequipmentused.AgenciesthatmeetthecriteriaofPracticeD3666aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3666alonedoesnotcompletelyassurereliableresults.Reliableresultsdependonmanyfactors:followingthesuggestionsofPracticeD3666orsimilaracceptableguidelineprovidesameansofevaluatingandcontrollingsomeofthosefactors.1.1ThistestmethodcoversthedeterminationofrelativedensityandabsorptionoffineaggregatesbyMethodAandcoarseandblendedaggregatesbyMethodB.1.2ThevaluesarestatedinSIunitsandareregardedasthestandardunits.1.3Amulti-laboratoryprecisionandbiasstatementforcoarseandcombinedaggregatetestsinthisstandardhasnotbeendevelopedatthistime.Therefore,thisstandardshouldnotbeusedforacceptanceorrejectionofcoarseandcombinedaggregatematerialsforpurchasingpurposes.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q13
【国际标准分类号】:91_100_15
【页数】:8P.;A4
【正文语种】:英语