加州承载比试验(路桥英语培训)

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1、5加州承载比试验山东交通学院专业英语培训彭霞2012年CALIFORNIABEARINGRATIOTEST OBJECTIVETodeterminetheCaliforniabearingratiobyconductingaloadpenetrationtestinthelaboratory. NEEDANDSCOPEThecaliforniabearingratiotestispenetrationtestmeantfortheevaluationofsubgradestrengthofroadsandpavements.Theresultsobtainedbyt

2、hesetestsareusedwiththeempiricalcurvestodeterminethethicknessofpavementanditscomponentlayers.Thisisthemostwidelyusedmethodforthedesignofflexiblepavement.ThisinstructionsheetcoversthelaboratorymethodforthedeterminationofC.B.R.ofundisturbedandremoulded/compactedsoilspecimens,bothinsoaked

3、aswellasunsoakedstate. PLANNINGANDORGANIZATIONEquipmentsandtoolrequired.1.Cylindricalmouldwithinsidedia150mmandheight175mm,providedwithadetachableextensioncollar50mmheightandadetachableperforatedbaseplate10mmthick. 2.Spacerdisc148mmindiaand47.7mminheightalongwithhandle. 3.Metalrammers.

4、Weight2.6kgwithadropof310mm(or)weight4.89kgadrop450mm. 4.Weights.Oneannularmetalweightandseveralslottedweightsweighing2.5kgeach,147mmindia,withacentralhole53mmindiameter. 5.Loadingmachine.Withacapacityofatleast5000kgandequippedwithamovableheadorbasethattravelsatanuniformrateof1.25mm/mi

5、n.Completewithloadindicatingdevice. 6.Metalpenetrationpiston50mmdiaandminimumof100mminlength. 7.Twodialgaugesreadingto0.01mm. 8.Sieves.4.75mmand20mmI.S.Sieves.5加州承载比试验山东交通学院专业英语培训彭霞2012年9.Miscellaneousapparatus,suchasamixingbowl,straightedge,scalessoakingtankorpan,dryingoven,filterpape

6、randcontainers. DEFINITIONOFC.B.R.Itistheratioofforceperunitarearequiredtopenetrateasoilmasswithstandardcircularpistonattherateof1.25mm/min.tothatrequiredforthecorrespondingpenetrationofastandardmaterial.C.B.R.=Testload/Standardload�100Thefollowingtablegivesthestandardloadsadoptedfordi

7、fferentpenetrationsforthestandardmaterialwithaC.B.R.valueof100%Penetrationofplunger(mm)Standardload(kg)2.55.07.510.012.513702055263031803600Thetestmaybeperformedonundisturbedspecimensandonremouldedspecimenswhichmaybecompactedeitherstaticallyordynamically. PREPARATIONOFTESTSPECIMENUnd