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ASTM D1557-2009 用修正作用力56000ft-Ibf/ft(2700KN-m/m3)测量土壤实验室压实特性的标准试验方法

作者:标准资料网 时间:2024-05-14 22:58:13  浏览:8813   来源:标准资料网
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【英文标准名称】:StandardTestMethodsforLaboratoryCompactionCharacteristicsofSoilUsingModifiedEffort(56,000ft-lbf/ft3(2,700kN-m/m3))
【原文标准名称】:用修正作用力56000ft-Ibf/ft(2700KN-m/m3)测量土壤实验室压实特性的标准试验方法
【标准号】:ASTMD1557-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:compactioncharacteristics;density;impactcompactionusingmodifiedeffort;laboratorytests;modifiedproctortest;moisture-densitycurves;soilcompaction;Compactionmeasurement--soils;Density--soil/rock/relatedmaterials;Dryunitweight;Ear
【摘要】:Soilplacedasengineeringfill(embankments,foundationpads,roadbases)iscompactedtoadensestatetoobtainsatisfactoryengineeringpropertiessuchasshearstrength,compressibility,orpermeability.Inaddition,foundationsoilsareoftencompactedtoimprovetheirengineeringproperties.Laboratorycompactiontestsprovidethebasisfordeterminingthepercentcompactionandmoldingwatercontentneededtoachievetherequiredengineeringproperties,andforcontrollingconstructiontoassurethattherequiredcompactionandwatercontentsareachieved.Note38212;Thedegreeofsoilcompactionrequiredtoachievethedesiredengineeringpropertiesisoftenspecifiedasapercentageofthemodifiedmaximumdryunitweightasdeterminedusingthistestmethod.Iftherequireddegreeofcompactionissubstantiallylessthanthemodifiedmaximumdryunitweightusingthistestmethod,itmaybepracticablefortestingtobeperformedusingTestMethodD698andtospecifythedegreeofcompactionasapercentageofthestandardmaximumdryunitweight.Sincemoreenergyisappliedforcompactionusingthistestmethod,thesoilparticlesaremorecloselypackedthanwhenD698isused.Thegeneraloverallresultisahighermaximumdryunitweight,loweroptimummoisturecontent,greatershearstrength,greaterstiffness,lowercompressibility,lowerairvoids,anddecreasedpermeability.However,forhighlycompactedfine-grainedsoils,absorptionofwatermayresultinswelling,withreducedshearstrengthandincreasedcompressibility,reducingthebenefitsoftheincreasedeffortusedforcompaction(2).UseofD698,ontheotherhand,allowscompactionusinglesseffortandgenerallyatahigheroptimummoisturecontent.Thecompactedsoilmaybelessbrittle,moreflexible,morepermeable,andlesssubjecttoeffectsofswellingandshrinking.Inmanyapplications,buildingorconstructioncodesmaydirectwhichtestmethod,D698orthisone,shouldbeusedwhenspecifyingthecomparisonoflaboratorytestresultstothedegreeofcompactionofthein-placesoilinthefield.Duringdesignofanengineeredfill,testingperformedtodetermineshear,consolidation,permeability,orotherpropertiesrequirestestspecimenstobepreparedbycompactingthesoilataprescribedmoldingwatercontenttoobtainapredeterminedunitweight.Itiscommonpracticetofirstdeterminetheoptimumwatercontent(wopt)andmaximumdryunitweight(x03B3;dmax)bymeansofacompactiontest.Testspecimensarecompactedataselectedmoldingwatercontent(w),eitherwetordryofoptimum(wopt)oratoptimum(wopt),andataselecteddryunitweightrelatedtoapercentageofmaximumdryunitweight(x03B3;dmax).Theselectionofmoldingwatercontent(w),eitherwetordryofoptimum(wopt)oratoptimum(wopt)andthedryunitweight(x03B3;dmax)maybebasedonpastexperience,orarangeofvaluesmaybeinvestigatedtodeterminethenecessarypercentofcompaction.Experienceindicatesthatthemethodsoutlinedin5.2ortheconstructionc..........
【中国标准分类号】:B11
【国际标准分类号】:93_020
【页数】:14P.;A4
【正文语种】:英语


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【英文标准名称】:ElectricalLampBases
【原文标准名称】:电灯基座
【标准号】:ANSIC81.61a-1993
【标准状态】:作废
【国别】:美国
【发布日期】:1993
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:灯;照明工程;灯座
【英文主题词】:lampholders;illuminationengineering;lamps
【摘要】:
【中国标准分类号】:K74
【国际标准分类号】:29_140_10
【页数】:
【正文语种】:英语


【英文标准名称】:AlloySteelSocketButtonandFlatCountersunkHeadCapScrews
【原文标准名称】:合金钢管座凸头及扁平沉头六角螺钉
【标准号】:ASTMF835-1998
【标准状态】:作废
【国别】:美国
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:螺钉;沉头螺钉;平头螺钉;管套;盘头螺钉;钢;紧固件;合金
【英文主题词】:fasteners;alloys;steels;countersunkheadscrews;screws(bolts);panheadscrews;sleeves
【摘要】:
【中国标准分类号】:J13
【国际标准分类号】:21_060_10
【页数】:
【正文语种】:英语



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