1、Designation:E2835–11StardTestMethodfMeasuringDeflectionsusingaPtableImpulsePlateLoadTestDevice1ThisstardisissuedunderthefixeddesignationE2835thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninth

2、ecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodappliestomeasuringplatedeflectionsus

3、ingaPtableImpulsePlateLoadTestdevice.Themethodcoversthemeasurementofdeflectionoftheloadplateratherthanthedeflectionofthesurfaceofthepavementfoundationlayers(seeNote1).1.2ThevaluesstatedinSIunitsaretoberegardedasthestard.

4、Thevaluesgiveninparenthesesarefinfmationonly.1.3Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminet

5、heapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D4695GuidefGeneralPavementDeflectionMeasurementsD1195TestMethodfRepetitiveStaticPlateLoadTestsofSoilsFlexiblePavementComponentsfUseinEvalua

6、tionDesignofAirptHighwayPavements3.SummaryofTestMethod3.1Thistestmethodisatypeofplatebearingtest.Theloadisafcepulsegeneratedbyafallingmasspedontoaspringassemblythattransmitstheloadpulsetoaplaterestingonthematerialunderte

7、st.3.2Themassisraisedtoapresetheightthenpedtodeliverthedesiredfcepulse.Thedeviceiscalibratedtoapresetheightbythemanufacturer.Thepresetheightshallnotbechangedbytheuser.3.3Theresultingplatedeflectionismeasuredusingsuitable

8、instrumentation.Multiplesfromthesamepresetheightmaybeperfmedatthesametestlocation.3.4Thepeakplatedeflectionresultingfromeachateachlocationisrecdedinmicrometersotherunitofmeasureasappropriate.4.SignificanceUse4.1Thistestm

9、ethodcoversthedeterminationofplatedeflectionresultingfromtheapplicationofanimpulseload.Thedeflectionismeasuredatthecenterofthetopoftheloadplate(seeNote1).NOTE1—Iftheloadplateisin“perfectlyunifm”contactwiththeunboundmater

10、ialundertheplatethendeflectionoftheloadplateshouldbeequaltothedeflectionofthesurfaceoftheunboundmaterialundertest.Howeverwithtypicalunboundmaterialsa100%unifmcontactcanseldombeachieved.Accdinglythetestsurfaceshallbeascle

11、ansmoothaspossiblewithloosegranulesprotrudingmaterialremoved.Fgravelsurfacesitisrecommendedthatathinlayeroffinesbeplacedoverthetestpoint.Ffinegrainedmaterialsthiswillhelpinobtainingareasonablyunifmcontactbetweentheloadpl

12、atethesurface.See5.1inTestMethodD1195.4.2Deflectionsmaybeeithercrelateddirectlytopavementperfmanceusedtodetermineinsitumaterialacteristicsofthepavementfoundationlayers.Someusesofthedataincludequalitycontrolqualityassuran

13、ceofcompactedlayersfstructuralevaluationofloadcarryingcapacity(seeNote2GuideD4695).NOTE2—Thevolumeofthepavementfoundationmaterialsaffectedbytheappliedloadisafunctionofthemagnitudeoftheloadplatesizerigidityloadingratebuff

14、erstiffnessthestiffnessshearstrengthofthepavementfoundationmaterials.TherefecaremustbetakenwhenanalyzingtheresultsbecausethedataobtainedbythePtableImpulsePlateLoadTestmaybeobtainedundersubstantiallydifferentconditionstha

15、nwhenaheavymovingwheelloadpassesoverthepavementsurfaceafterconstructioniscomplete.5.Apparatus5.1InstrumentationSystemconfmingtothefollowinggeneralrequirements.5.2InstrumentsExposedtotheElementsoperableinthetemperatureran

16、gefrom0Cto50C(32Fto120F)1ThistestmethodisunderthejurisdictionofASTMCommitteeE17onVehiclePavementSystemsisthedirectresponsibilityofSubcommitteeE17.41onPavementTestingEvaluation.CurrenteditionapprovedJune12011.PublishedJun

17、e2011.DOI:10.1520E2835–112FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.1Copyright?ASTMInternati

18、onal100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.8.2.1Rigid(thatisconcrete)foundationasthetestingplatfm8.2.2Padstoallowdeflectionmeasurementsintherangesspecifiedfthecalibrationprocedure.8.2.3Paddimens

19、ionsnosmallerthan1.5timestheloadplatediameter.8.2.4Fullygedbatteries8.3Meetthefollowingenvironmentalrequirements:8.3.1Completeverificationtestingatatemperaturerangefrom16Cto22C(60Fto72F).8.3.2Allowsufficienttimeftheequip

20、menttoreachthisspecifiedtemperaturerange.8.4Perfmverificationtestingusingthefollowingprocedure:8.4.1Marktestlocationonrigidfoundationtestpad(s).8.4.2Placepad(s)onmarkedtestlocation.8.4.3Placetestdeviceonmarkedtestpad(s).

21、8.4.4Perfmninemasssusingthespecifiedprocedure(SeeSection3).8.4.5Recdresultingpeakdeflectionvalues.8.4.6Recdsupptinginfmationsuchasairtemperaturesurfacetemperaturedistancemeasurementsothertestidentificationdataasneeded.8.

22、5Completethefollowingcalculations(2)similaranalysestoensurerepeatabilityofdeflectionmeasurements:8.5.1Smax2Smin#0.04mm~1.6mils!(1)Definitions:Smax=max(S1S2S3S4S5S6S7S8S9)Smin=min(S1S2S3S4S5S6S7S8S9)Si=Deflectionmeasureme

23、ntsfi(wherei=1to9)mmSmax=maximumdeflectionmeasurementmmSmin=minimumdeflectionmeasurementmm8.5.2|Smean2Si|#0.02mm~0.8mils!feachSi(2)8.5.2.1Smean5(i519Si9(3)Si=Deflectionmeasurementsfi(wherei=1to9)mmSmean=Meandeflectionfas

24、etof9verificationtestsonthegivenpadconfigurationmm8.5.3|SiSmean@calibration|#0.02mm(0.8mils)(seeNote5)8.6Repeataboveprocedureonremainingpadconfigurations.8.7Submitdevicefcalibrationwhentheconditionsoutlinedin8.5arenotmet

25、fanypadconfiguration.NOTE4—ItmaybebeneficialtoperfmverificationtestingonnewlypurchasedrecentlycalibrateddevicestoensurethedeviceiswkingproperlypritoPtableImpulsePlateLoadTestdevicecommissioning.Thiswouldalsoprovideabasel

26、inetowhichlaterverificationtestingcouldbecompared.NOTE5—Thiscalculationiscarriedoutifdeflectionsduringcalibrationweremeasuredunderthesameconditionsasthesubsequentverificationtests.9.Hazards9.1Keepbackstraightliftwithlegm

27、uscleswhenelevatingpingcatchingthemass.9.2Makesurethathsarenotpositionedbeneaththeelevatedmass.9.3Secureloadmassintothelowerlockedpositionpritoduringtransptationbetweentestlocations.10.MaintenanceHling10.1Inspectequipmen

28、tfnecessaryrepairs(seeNote6).10.2Stetestdeviceinadryplacewhennotinuse.10.3Protecttheguiderodfromcontactwithunboundmaterials.10.4Cleanthefcegeneratingdevicebyremovinganydirtwithadrycloth.Donotgreasetheguiderodsinceitisgen

29、erallymadeofstainlesssteel.10.5Checktheheightregularlytoensurethatthereleasemechanismhasnotmovedfromthepresetheightdeterminedduringcalibration.10.6Maintainbatterygegreaterthan50percent.NOTE6—Fsomedevicesensurethattherubb

30、erbellowenclosingthespringassemblyisprovidingatightsealtoprotectthespringassemblyfromdustdamage.11.11.1Perfmunboundmaterialtestatthetimeofcompactionimmediatelyaftercrectiveactions.11.2Ensurepavementfoundationlayersarenot

31、frozen.(2).11.3Perfmtestwhenthedeflectionmeasurementsaregreaterthan0.2mm(8mils)lessthan3.0mm(120mils).12.SiteionPreparation12.1Createarelativelysmoothlevelspotthatwillallowtheguiderodtoremainverticalpreventtranslationoft

32、heloadplateduringtesting.12.2Ensurethetestareaslopeislessthan4percent.12.3Prepareatestareathatisatleast1.5timeslargerthanthediameteroftheloadingplate.12.4Removeloosedriedcrackedunevenmaterialpritotesting.12.5Perfmtestsby

33、placingtheloadplateataunifmdepth.Ensureconsistentplatetestdepthsaremaintainedthroughouttheprojectfanygivenmaterialtype.Thefollowingtestdepthsarerecommended:MaterialTypePtableImpulsePlateLoadTestDepth(seeNote7)SWSPSWSMSWS

34、CSPSMSPSC#onehalfliftthickness(seeNote8)GWGPGWGMGWGCGPGMGPGCGMGCCLMLCHMHOLOHSMSCCompactedwithPadfootRoller:BottomofdeepestindentationofthepadfootpactedwithSmoothDrumRoller:CompactionSurface(0mm)NOTE7—Thedepthofinfluencei