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.

2、Theresultsobtainedbythesetestsareusedwiththeempiricalcurvestodeterminethethicknessofpavementanditscomponentlayers.Thisisthemostwidelyusedmethodforthedesignofflexiblepavement.ThisinstructionsheetcoversthelaboratorymethodforthedeterminationofC.B.R.ofundisturbedandrem

3、oulded/compactedsoilspecimens,bothinsoakedaswellasunsoakedstate. PLANNINGANDORGANIZATIONEquipmentsandtoolrequired.1.Cylindricalmouldwithinsidedia150mmandheight175mm,providedwithadetachableextensioncollar50mmheightandadetachableperforatedbaseplate10mmthick. 2.Spacer

4、disc148mmindiaand47.7mminheightalongwithhandle. 3.Metalrammers.Weight2.6kgwithadropof310mm(or)weight4.89kgadrop450mm. 4.Weights.Oneannularmetalweightandseveralslottedweightsweighing2.5kgeach,147mmindia,withacentralhole53mmindiameter. 5.Loadingmachine.Withacapacityo

5、fatleast5000kgandequippedwithamovableheadorbasethattravelsatanuniformrateof1.25mm/min.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

6、2012年9.Miscellaneousapparatus,suchasamixingbowl,straightedge,scalessoakingtankorpan,dryingoven,filterpaperandcontainers. DEFINITIONOFC.B.R.Itistheratioofforceperunitarearequiredtopenetrateasoilmasswithstandardcircularpistonattherateof1.25mm/min.tothatrequiredforthe

7、correspondingpenetrationofastandardmaterial.C.B.R.=Testload/Standardload�100ThefollowingtablegivesthestandardloadsadoptedfordifferentpenetrationsforthestandardmaterialwithaC.B.R.valueof100%Penetrationofplunger(mm)Standardload(kg)2.55.07.510.012.51370205526303180360

8、0Thetestmaybeperformedonundisturbedspecimensandonremouldedspecimenswhichmaybecompactedeitherstaticallyordynamically. PREPARATIONOFTESTSPECIMENUnd