【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
基本信息
标准名称: | 透射式电视均匀性测试图 |
英文名称: | Quality of distribution test chart of transparencies for television |
中标分类: |
通信、广播 >>
广播、电视设备 >>
广播、电视设备综合 |
ICS分类: |
电信、音频和视频技术 >>
电信专用测量设备
|
替代情况: | 替代SJ 1695-1981 SJ 1696-1981 SJ 1697-1981 SJ 1698-1981 SJ 1699-1981 SJ 1700-1981 SJ 1701-1981 SJ 1702-1981;被GB/T 6996-2012代替 |
发布部门: | 国家标准局 |
发布日期: | 1986-11-20 |
实施日期: | 1987-10-01 |
首发日期: | 1986-11-20 |
作废日期: | 2013-02-15 |
主管部门: | 信息产业部(电子) |
提出单位: | 中华人民共和国电子工业部 |
归口单位: | 电子工业部标准化研究所 |
起草单位: | 电子部55所 |
起草人: | 郝元福、胡振清、朱生良 |
出版社: | 中国标准出版社 |
出版日期: | 1987-10-01 |
页数: | 3页 |
适用范围
本测试图主要供电视摄像器件检验输出信号均匀性和电子束着靶误差用。
前言
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引用标准
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所属分类: 通信 广播 广播 电视设备 广播 电视设备综合 电信 音频和视频技术 电信专用测量设备