Designation:D5081/D5081M−90(Reapproved2011)´1StandardTestMethodforAggregateLayerHidingPower1ThisstandardisissuedunderthefixeddesignationD5081/D5081M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.´1NOTE—UnitsinformationwaseditoriallycorrectedinJanuary2012.1.Scope1.1Thistestmethodmeasuresthequantityofaggregateneededtoprovideanopaquelayerunderlaboratoryconditions.AggregatesizeNumbers1through8,aslistedinClassificationD448,maybetested.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C702PracticeforReducingSamplesofAggregatetoTestingSizeD75PracticeforSamplingAggregatesD448ClassificationforSizesofAggregateforRoadandBridgeConstructionD1079TerminologyRelatingtoRoofingandWaterproofing3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,seeTerminologyD1079.4.SignificanceandUse4.1Oneofthefunctionsofaroofingaggregateistoshieldtheroofingmembranefromsunlightthatmaybedestructivetotheroofingmembrane.Thistestmethodmeasuresthequantityofgravelneededtoexcludelightunderarbitrarylaboratoryconditions.Thistestmethodneednotbeperformediftheroofingmembraneisnotaffectedbylightexposure.5.Apparatus5.1ExposureBox,300-mm2[12-in.2]61%tray,90mm[3.6in.]minimumdeepwithanopaquelid.5.2LightSource—150-Wfloodlightwithstand.5.3CountingTemplate—Aclearplasticmaskwith100-mm2[4-in.2]grido...
