2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:C1747C1747M?13StardTestMethodfDeterminingPotentialResistancetoDegradationofPerviousConcretebyImpactAbrasion1ThisstardisissuedunderthefixeddesignationC1747C1747Mthenumberimmediatelyfollowingthedesignationindic

2、atestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcover

3、sdeterminingthepotentialresistancetodegradationofperviousconcretebymeasuringthemasslossofspecimenssubjectedtocombinedactionofimpactabrasioninarotatingsteeldrum.1.2Units—ThevaluesstatedineitherSIunitsinchpoundunitsaretobe

4、regardedseparatelyasstard.Thevaluesstatedineachsystemmaynotbeexactequivalentstherefeeachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconfmancewiththestard.1.3Thetextofthistestmet

5、hodreferencesnotesfootnotesthatprovideexplanatyinfmation.Thesenotesfootnotes(excludingthoseintables)shallnotbeconsideredasrequirementsofthistestmethod.1.4Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociate

6、dwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.(Warning—Freshhydrauliccementitiousmixturesarecausticmaycausechemical

7、burnstoskintissueuponprolongeduse.2)2.ReferencedDocuments2.1ASTMStards:3C125TerminologyRelatingtoConcreteConcreteAggregatesC131TestMethodfResistancetoDegradationofSmallSizeCoarseAggregatebyAbrasionImpactintheLosAngelesMa

8、chineC136TestMethodfSieveAnalysisofFineCoarseAggregatesC172PracticefSamplingFreshlyMixedConcreteC192C192MPracticefMakingCuringConcreteTestSpecimensintheLabatyC470C470MSpecificationfMoldsfFmingConcreteTestCylindersVertica

9、llyC670PracticefPreparingPrecisionBiasStatementsfTestMethodsfConstructionMaterialsC1688C1688MTestMethodfDensityVoidContentofFreshlyMixedPerviousConcreteD6926PracticefPreparationofBituminousSpecimensUsingMarshallApparatus

10、E11SpecificationfWovenWireTestSieveClothTestSieves3.Terminology3.1Definitions:3.1.1FdefinitionsoftermsusedinthistestmethodrefertoTerminologyC125.3.2DefinitionsofTermsSpecifictoThisStard:3.2.1designdensityn—themassofaunit

11、volumeofperviousconcretebasedonthetheeticalmixtureproptionsvoidcontentwheretheunitvolumeincludesthevolumeofthesolidsthevoids.3.2.2ravelingn—thewearingawayofapavementsurfaceduetodislodgementofaggregateparticles.4.Summaryo

12、fTestMethod4.1Thistestmethodconsistsofcastingcylindricalspecimensofperviousconcreteatthedesigndensitythensubjectingthecuredspecimenstoacombinationofactionsincludingimpactabrasionattritiongrindinginarotatingsteeldrum.Thep

13、otentialresistancetodegradationbyimpactabrasionisexpressedasthepercentagemasslossafter500revolutionsofthesteeldrum.Higherpotentialresistancetodegradationbyimpactabrasionisassociatedwithlowermassloss.5.SignificanceUse5.1T

14、histestmethodprovidesaprocedurefevaluatingthepotentialresistancetodegradationbyimpactabrasionof1ThistestmethodisunderthejurisdictionofASTMCommitteeC09onConcreteConcreteAggregatesisthedirectresponsibilityofSubcommitteeC09

15、.49onPerviousConcrete.CurrenteditionapprovedNov.12013.PublishedFebruary2012.iginallyapprovedin2011.Lastpreviouseditionapprovedin2011asC1747C1747M–11.DOI:10.1520C1747_C1747M13.2SeeSectiononSafetyPrecautionsManualofAggrega

16、teConcreteTestingAnnualBookofASTMStardsVol.04.02.3FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.

17、ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1coolingdevicesasnecessary.Recdtheairtemperatureadjacenttothespecimensusingama

18、ximumminimumthermometer.Specimensshallnotbetranspteduntilatleast24haftercasting.8.5FinalCuring—Uponcompletingofinitialcuringcurespecimensatatemperatureof2362C[73.563.5F]f7.0060.25daysmeasuredfromthetimeofmolding.Finalcur

19、ingshallbecompletedwithoutremovingthecylindermoldsbagscaps.8.6Identification—Markthespecimenstopositivelyidentifythemtheconcretetheyrepresent.Donotmarktheremovablecapsbags.9.Procedure9.1Uponcompletionofcuringremovethemol

20、dswipethespecimensdryofanyfreemoistureplacethethreespecimensusedtoprovideasingletestresultonthebalance.Recdthemassofthethreespecimensastheiginalmass.9.2Within30minafterremovingthemoldsplacethethreespecimensintheLosAngele

21、smachinesothatnoedgesarechippedintheprocess.Donotgethemachinewithsteelspheres.Rotatethemachineat30to33rminf500revolutions.9.3After500revolutionsdisgethematerialfromthemachinehsievethematerialona25mm(1in.)sieve.Rotatethep

22、articlesifnecessaryindertodeterminewhethertheywillpassthroughthesieveopeninghoweverdonotfceparticlestopass.Recdthefinalmassasthatmaterialretainedonthe25mm(1in.)sieve.10.Calculation10.1Calculatethemasslossasthedifferenceb

23、etweentheiginalmassofthethreespecimensthefinalmassretainedonthesieve.10.2Dividethemasslossbytheiginalmassofthethreespecimensmultiplyby100.10.3Recdthemasslossasapercentageoftheiginalmasstothenearest1%.11.Rept11.1Reptthefo

24、llowinginfmation:11.1.1Identificationofthemixture11.1.2Numberofblowsnecessaryfcompaction11.1.3Maximumminimumtemperaturefinitialcuring11.1.4iginalmassfinalmassofthethreespecimens11.1.5Masslossofthespecimensexpressedtothen

25、earest1%bymass11.1.6ThedensityvoidcontentofthemixtureasproptionedasmeasuredbyTestMethodC1688C1688M.12.PrecisionBias12.1TheprecisionofthistestmethodisbasedonaninterlabatystudyRR:C0910414conductedin2010.NOTE3—Repeatability

26、testingwasperfmedbysevenlabatiesusingperviousconcretemixturesproptionedusinglocalmaterials.Eachlabatypreparedthreebatches(designedatvoidcontentsof182022%respectively)perfmedthreereplicatetestsperbatch(atestincludesthreei

27、ndividualspecimens).Fiveofthelabatieshad2differenttechniciansperfmingthetest.Thepercentmasslossrangedbetween19%95%.12.1.1Thesingleoperatstarddeviationofasingletestresult(atestincludesthreeindividualspecimens)hasbeenfound

28、tobe1.4%.12.1.2Thesinglelabatymultioperatstarddeviationofasingletestresult(atestincludesthreeindividualspecimens)hasbeenfoundtobe1.3%.12.2Atthetimeofthestudytherewasnoacceptedreferencematerialsuitablefdeterminingthebiasf

29、thistestmethodtherefenostatementonbiasisbeingmade.13.Keywds13.1abrasiondurabilityimpactMarshallhammerperviousconcreteravelingSUMMARYOFCHANGESCommitteeC09hasidentifiedthelocationofedchangestothesetestmethodssincethelastis

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