【英文标准名称】:StandardPracticeforCorrectionofUnitWeightandWaterContentforSoilsContainingOversizeParticles
【原文标准名称】:含有超大颗粒土壤的单位重量和含水量的修正标准实施规程
【标准号】:ASTMD4718-1987(2007)
【标准状态】:现行
【国别】:
【发布日期】:1987
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:颗粒;含水量;施工材料;修正;建筑;土壤;工艺;重量
【英文主题词】:oversizeparticles;unitweight;watercontent
【摘要】:CompactiontestsonsoilsperformedinaccordancewithTestMethodsD698,D1557,andD4253placelimitationsonthemaximumsizeofparticlesthatmaybeusedinthetest.Ifasoilcontainscobblesorgravel,orboth,testoptionsmaybeselectedwhichresultinparticlesretainedonaspecificsievebeingdiscarded(forexampletheNo.4(4.75-mm)orthex00BE;-in.(19-mm)orotherappropriatesize),andthetestperformedonthefinerfraction.Theunitweightx2013;watercontentrelationsdeterminedbythetestsreflectthecharacteristicsoftheactualmaterialtested,andnotthecharacteristicsofthetotalsoilmaterialfromwhichthetestspecimenwasobtained.Itiscommonengineeringpracticetouselaboratorycompactiontestsforthedesign,specification,andconstructioncontrolofsoilsusedinearthconstruction.Ifasoilusedinconstructioncontainslargeparticles,andonlythefinerfractionisusedforlaboratorytests,somemethodofcorrectingthelaboratorytestresultstoreflectthecharacteristicsofthetotalsoilisneeded.Thispracticeprovidesamathematicalequationforcorrectingtheunitweightandwatercontentofthetestedfinerfractionofasoil,todeterminetheunitweightandwatercontentofthetotalsoil.Similarly,thispracticeprovidesameansforcorrectingtheunitweightandwatercontentoffieldcompactedsamplesofthetotalsoil,sothatvaluescanbecomparedwiththoseforalaboratorycompactedfinerfraction.Note18212;Whenthispracticeisusedforconstructioncontrol,theusingagencyshouldspecifywhetherthemaximumunitweightvalueusedforreferenceistheunitweightincludingoversizefractionortheunitweightofthefinerfraction.Calculatedvaluesofpercentcompactionbasedonthiscorrectionpracticewillvarydependingonwhichunitweightvalueisusedforreference.1.1Thispracticepresentsaprocedureforcalculatingtheunitweightsandwatercontentsofsoilscontainingoversizeparticleswhenthedataareknownforthesoilfractionwiththeoversizeparticlesremoved.1.2Thepracticealsocanbeusedtocalculatetheunitweightsandwatercontentsofsoilfractionswhenthedataareknownforthetotalsoilsamplecontainingoversizeparticles.1.3Thispracticeisbasedontestsperformedonsoilsandsoil-rockmixturesinwhichtheportionconsideredoversizeisthatfractionofthematerialretainedontheNo.4sieve.Basedonthesetests,thispracticeisapplicabletosoilsandsoil-rockmixturesinwhichupto40%ofthematerialisretainedontheNo.4sieve.Thepracticealsoisconsideredvalidwhentheoversizefractionisthatportionretainedonsomeothersieve,suchasthe3/4-in.sieve,butthelimitingpercentageofoversizeparticlesforwhichthecorrectionisvalidmaybelower.However,thepracticeisconsideredvalidformaterialshavingupto30%oversizeparticleswhentheoversizefractionisthatportionretainedonthe3/4-in.sieve.1.4Thefactorcontrollingthemaximumpermissiblepercentageofoversizeparticlesiswhetherinterferencebetweentheoversizeparticlesaffectstheunitweightofthefinerfraction.Forsomegradations,thisinterferencemaybegintooccuratlowerpercentagesofoversizeparticles,sothelimitingpercentagemustbelowerforthesematerialstoavoidinaccuraciesinthecomputedcorrection.Thepersonoragencyusingthispracticeshalldeterminewhetheralowerpercentageistobeused.1.5Thispracticemaybeappliedtosoilswithanypercentageofoversizeparticlessubjecttothelimitationsgivenin1.4and.However,thecorrectionmaynotbeofpracticalsignificanceforsoilswithonlysmallperc......
【中国标准分类号】:Z18
【国际标准分类号】:93_020
【页数】:3P.;A4
【正文语种】: