Designation:D2940/D2940M−20StandardSpecificationforGradedAggregateMaterialforBasesorSubbasesforHighwaysorAirports1ThisstandardisissuedunderthefixeddesignationD2940/D2940M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoversquality-controlledgradedag-gregatesthat,whenhauledtoandproperlyspreadandcom-pactedonapreparedgradetoappropriatedensitystandards,maybeexpectedtoprovideadequatestabilityandloadsupportforuseashighwayorairportbasesorsubbases.NOTE1—Theengineeriscautionedtoprovideappropriateconstructionspecificationstoensurecompactiontoanextentthatfurtherdensificationfromtrafficloadingsonthecompletedpavementwillbeinsignificant.Themethodsuggestedistorequirecompactiononafirmfoundationofashortcontrolstripofthematerialatasuitablemoisturecontent,bymeansofvibratoryorotherproveneffectiverollersortampers,untilnofurtherincreaseindensityresults.Compactionrequirementsshouldensurethatanaveragedensityofcertainappropriatepercentagesofthecontrolstripmaximumdensitybeachievedonthebalanceofthejob;forbasecourses,98%issuggestedastheminimumaveragerequirement.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironme...
