基本信息
标准名称: | 压电陶瓷材料性能测试方法 静态弯曲强度的测试 |
英文名称: | Test methods for the properties of piezoelectric ceramics - Test for the static flexural strength |
中标分类: |
电子元器件与信息技术 >>
电子元件 >>
滤波器、延迟线 |
ICS分类: |
|
替代情况: | 替代GB/T 11387-1989 |
发布部门: | 中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会 |
发布日期: | 2008-08-04 |
实施日期: | 2009-02-01 |
首发日期: | 1989-05-20 |
作废日期: | |
主管部门: | 全国海洋船标准化技术委员会船用材料应用工艺分技术委员会 |
提出单位: | 中国船舶工业集团公司 |
归口单位: | 全国海洋船标准化技术委员会船用材料应用工艺分技术委员会 |
起草单位: | 中国船舶工业集团公司国营第七二一厂 |
起草人: | 朱斌、张晖、张丽英 |
出版社: | 中国标准出版社 |
出版日期: | 2009-02-01 |
页数: | 8页 |
计划单号: | 20065225-T-522 |
适用范围
本标准规定了压电陶瓷材料静态弯曲强度的测试原理、测试条件、试样、测试设备及装置和测试步骤。 本标准适用于测量压电陶瓷材料在室温下的静态弯曲强度。
前言
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引用标准
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所属分类: 电子元器件与信息技术 电子元件 滤波器 延迟线
【英文标准名称】:StandardTestMethodforMicroscopicalDeterminationofParametersoftheAir-VoidSysteminHardenedConcrete
【原文标准名称】:硬化混凝土中空气孔隙系统参数的显微测定用标准试验方法
【标准号】:ASTMC457/C457M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【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】:C09.65
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:空气含量;硬化混凝土中空气孔隙参数;要求的制备区域表面;空隙的平均弦长;空气孔隙参数的测定;产生的空隙;埋陷空隙;硬化混凝土搭叠的研磨粒;指标点;研磨;要求的截线长度;线性截线法;显微镜的;要求的点数;湿黏土-空气比;改良湿黏土-空气比;湿黏土含量;点计数法;显微镜分析的试样制备;空间系数;专用表面;孔隙率;水孔隙;空气含量-混凝土;空气孔隙;硬化水泥;显微镜检验-混凝土;改良点计算法;岩石分析;气孔结果;表面分析-混凝土
【英文主题词】:aircontent;airvoidparametersofhardenedconcrete;area-preparedsurfacerequired;averagechord-lengthofvoids;determinationofair-voidparameters;entrainedvoid;entrappedvoid;gritsforlappinghardenedconcrete;indexpoint;lapping;lengthoftraverserequired;linear-traversemethod;microscopical;numberofpointsrequired;paste-airratio;paste-airratiomodification;pastecontent;point-countmethod(modified);samplepreparationformicroscopicalanalysis;spacingfactor;specificsurface;voidfrequency;watervoid;Aircontent--concrete;Airvoids;Hardenedconcrete;Lineartraverse(Rosiwal)method;Microscopicexamination--concrete;Modifiedpoint-countmethod;Petrographicanalysis;Porestructure;Spacingfactor;Surfaceanalysis--concrete
【摘要】:Theparametersoftheair-voidsystemofhardenedconcretedeterminedbytheproceduresdescribedinthistestmethodarerelatedtothesusceptibilityofthecementpasteportionoftheconcretetodamagebyfreezingandthawing.Hence,thistestmethodcanbeusedtodevelopdatatoestimatethelikelihoodofdamageduetocyclicfreezingandthawingortoexplainwhyithasoccurred.Thetestmethodcanalsobeusedasanadjuncttothedevelopmentofproductsorproceduresintendedtoenhancetheresistanceofconcretetocyclicfreezingandthawing(1).Valuesforparametersoftheair-voidsystemcanbeobtainedbyeitheroftheproceduresdescribedinthistestmethod.Noprovisionismadefordistinguishingamongentrappedairvoids,entrainedairvoids,andwatervoids.Anysuchdistinctionisarbitrary,becausethevarioustypesofvoidsintergradeinsize,shape,andothercharacteristics.Reportsthatdomakesuchadistinctiontypicallydefineentrappedairvoidsasbeinglargerthan1mminatleastonedimensionbeingirregularinshape,orboth.Thehoney-combingthatisaconsequenceofthefailuretocompacttheconcreteproperlyisonetypeofentrappedairvoid(9,10).Watervoidsarecavitiesthatwerefilledwithwateratthetimeofsettingoftheconcrete.Theyaresignificantonlyinmixturesthatcontainedexcessivemixingwaterorinwhichpronouncedbleedingandsettlementoccurred.Theyaremostcommonbeneathhorizontalreinforcingbars,piecesofcoarseaggregateandaschannelwaysalongtheirsides.Theyoccuralsoimmediatelybelowsurfacesthatwerecompactedbyfinishingoperationsbeforethecompletionofbleeding.Applicationofthepaste-airratioprocedureisnecessarywhentheconcreteincludeslargenominalmaximumsizeaggregate,suchas50mm[2in.]ormore.Preparedsectionsofsuchconcreteshouldincludeamaximumofthemortarfraction,soastoincreasethenumberofcountsonairvoidsortraverseacrossthem.Theratioofthevolumeofaggregatetothevolumeofpasteintheoriginalmixmustbeaccuratelyknownorestimatedtopermitthecalculationoftheair-voidsystemsparametersfromthemicroscopicallydeterminedpaste-airratio.Note18212;Theair-voidcontentdeterminedinaccordancewiththistestmethodusuallyagreescloselywiththevaluedeterminedonthefreshconcreteinaccordancewithTestMethodsC138/C138M,C173/C173M,orC231(11).However,significantdifferencesmaybeobservedifthesampleoffreshconcreteisconsolidatedtoadifferentdegreethanthesamplelaterexaminedmicroscopically.Forconcretewitharelativelyhighaircontent(usuallyover7.5%),thevaluedeterminedmicroscopicallymaybehigherbyoneormorepercentagepointsthanthatdeterminedbyTestMethodC231.1.1Thistestmethoddescribesproceduresformicroscopicaldeterminationsoftheaircontentofhardenedconcreteandofthespecificsurface,voidfrequency,spacingfactor,andpaste-airratiooftheair-voidsysteminhardenedconcrete(1).Twoproceduresaredescribed:1.1.1ProcedureA,thelinear-traversemethod(2,3).1.1.2ProcedureB,t......
【中国标准分类号】:
【国际标准分类号】:
【页数】:15P.;A4
【正文语种】: