ASTM D4221-18英文版

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1、ThisinternationalstandardwasdevelopedinacordancewithinternationalyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecommendationsisuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(T

2、BT)Committee.Designation:D4221−18StandardTestMethodforDispersiveCharacteristicsofClaySoilbyDouble1HydrometerThisstandardisisuedunderthefixeddesignationD421;thenumberimmediatelyfolowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearof

3、lastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*obtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticeto1.1

4、Thistestmethodprovidesanindicationofthenaturalincreaseorreducesignificantdigitsofreporteddatatobedispersivecharacteristicsofclaysoilsbycomparingthecommensuratewiththeseconsiderations.Itisbeyondthescopeamountofparticlesfinerthan2-µmasdeterminedbythisofthisstandardto

5、considersignificantdigitsusedinanalysismethodcomparedtotheamountofparticlesfinerthan2-µmas2methodsforengineeringdesign.determinedbyTestMethodD7928(1).Inordertodothis1.7Thisstandarddoesnotpurporttoadresallofthecomparison,twosimilarspecimensmustbeobtainedfromthesaeft

6、yconcerns,ifany,asociatedwithitsuse.Itisthesample.responsibilityoftheuserofthisstandardtoestablishappro-1.2ThistestmethodfolowstheproceduregiveninTestpriatesaefty,health,andenvironmentalpracticesanddeter-MethodD7928withtheexceptionthatthesoilslurryisnotminetheapp

7、licabilityofregulatorylimitationspriortouse.mechanicallydispersedandnodispersingagentisadded.1.8Thisinternationalstandardwasdevelopedinaccor-1.3Thistestmethodisapplicableonlytosoilswherethedancewithinternationallyrecognizedprinciplesonstandard-positionoftheplasti

8、cityindexversusliquidlimitplots(TestizationestablishedintheDecisiononPrinciplesofrtheMethodsD4318)fallsonorabovethe“A”line(PracticeDevelopmentofInternationalSt