GB 12523-1990 建筑施工场界噪声限值
时间:2024-05-09 15:19:52 来源: 标准资料网 作者:标准资料网 阅读:9836
基本信息
标准名称: | 建筑施工场界噪声限值 |
英文名称: | Noise limits for construction site |
中标分类: |
环境保护 >>
污染物排放标准 >>
物理污染控制标准 |
ICS分类: |
|
替代情况: | 被GB 12523-2011代替并废止 |
发布部门: | 国家环境保护局 |
发布日期: | 1990-11-09 |
实施日期: | 1991-03-01 |
首发日期: | 1990-11-09 |
作废日期: | 2012-07-01 |
主管部门: | 国家环境保护总局 |
提出单位: | 国家环境保护局 |
归口单位: | 国家环境保护总局 |
起草单位: | 国家环境保护局 |
起草人: | 任文堂、何庆慈、孟娟、李旭、由鹏举 |
出版社: | 中国标准出版社 |
出版日期: | 1991-03-01 |
页数: | 1页 |
适用范围
本标准适用于城市建筑施工期间施工场地产生的噪声。
前言
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目录
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引用标准
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所属分类: 环境保护 污染物排放标准 物理污染控制标准
【英文标准名称】:MicrographicSheetandRollFilms,Dimensionsfor
【原文标准名称】:显微照相软片和胶卷的尺寸
【标准号】:ANSI/NAPMIT1.51-1997
【标准状态】:作废
【国别】:美国
【发布日期】:1997
【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】:尺寸;影片;摄影;摄影胶片
【英文主题词】:films;dimensions;photography;photographicfilm
【摘要】:
【中国标准分类号】:G81
【国际标准分类号】:37_040_20
【页数】:
【正文语种】:英语
【英文标准名称】:StandardTestMethodforFlexuralStrengthofAdvancedCeramicsatAmbientTemperature
【原文标准名称】:环境温度下高级陶瓷抗弯强度标准试验方法
【标准号】:ASTMC1161-2002c(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【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】:C28.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:advancedceramics;flexuralstrength;four-pointflexure;three-pointflexure;Advancedceramics;Flexuraltesting--ceramics;Four-pointloadedbeammethod;Fracturetesting--advancedceramics;Loadingtests--ceramics;Thermometers;Three-pointloadin
【摘要】:Thistestmethodmaybeusedformaterialdevelopment,qualitycontrol,characterization,anddesigndatagenerationpurposes.Thistestmethodisintendedtobeusedwithceramicswhosestrengthis50MPa(~7ksi)orgreater.Theflexurestressiscomputedbasedonsimplebeamtheorywithassumptionsthatthematerialisisotropicandhomogeneous,themoduliofelasticityintensionandcompressionareidentical,andthematerialislinearlyelastic.Theaveragegrainsizeshouldbenogreaterthanonefiftiethofthebeamthickness.Thehomogeneityandisotropyassumptioninthestandardruleouttheuseofthistestforcontinuousfiber-reinforcedceramics.Flexuralstrengthofagroupoftestspecimensisinfluencedbyseveralparametersassociatedwiththetestprocedure.Suchfactorsincludetheloadingrate,testenvironment,specimensize,specimenpreparation,andtestfixtures.Specimensizesandfixtureswerechosentoprovideabalancebetweenpracticalconfigurationsandresultingerrors,asdiscussedinMIL-STD1942(MR)andRefs(1)and(2).SpecificfixtureandspecimenconfigurationsweredesignatedinordertopermitreadycomparisonofdatawithouttheneedforWeibull-sizescaling.Theflexuralstrengthofaceramicmaterialisdependentonbothitsinherentresistancetofractureandthesizeandseverityofflaws.Variationsinthesecauseanaturalscatterintestresultsforasampleoftestspecimens.Fractographicanalysisoffracturesurfaces,althoughbeyondthescopeofthisstandard,ishighlyrecommendedforallpurposes,especiallyifthedatawillbeusedfordesignasdiscussedinMIL-STD-1942(MR)andRefs(2x2013;5)andPracticesC1322andC1239.Thethree-pointtestconfigurationexposesonlyaverysmallportionofthespecimentothemaximumstress.Therefore,three-pointflexuralstrengthsarelikelytobemuchgreaterthanfour-pointflexuralstrengths.Three-pointflexurehassomeadvantages.Itusessimplertestfixtures,itiseasiertoadapttohightemperatureandfracturetoughnesstesting,anditissometimeshelpfulinWeibullstatisticalstudies.However,four-pointflexureispreferredandrecommendedformostcharacterizationpurposes.Thismethoddeterminestheflexuralstrengthatambienttemperatureandenvironmentalconditions.Theflexuralstrengthunderambientconditionsmayormaynotnecessarilybetheinertflexuralstrength.Note78212;timedependenteffectsmaybeminimizedthroughtheuseofinerttestingatmospheresuchasdrynitrogengas,oil,orvacuum.Alternatively,testingratesfasterthanspecifiedinthisstandardmaybeused.Oxideceramics,glasses,andceramicscontainingboundaryphaseglassaresusceptibletoslowcrackgrowthevenatroomtemperature.Water,eitherintheformofliquidorashumidityinair,canhaveasignificanteffect,evenattheratesspecifiedinthisstandard.Ontheotherhand,manyceramicssuchasboroncarbide,siliconcarbide,aluminumnitrideandmanysiliconnitrideshavenosensitivitytoslowcrackgrowthatroomtemperatureandtheflexuralstrengthinlaboratoryambientconditionsistheinertflexuralstrength.1.1Thistestmethodcoversthedeterminationofflexuralstrengthofadvancedceramicmaterialsatambienttemperature.Four-pointx2013;x00BC;pointandthree-pointloadingswithprescribedspansarethestandard.Rectangularspecimensofprescribedcross-sectionsizesareusedwithspecifiedfeaturesinprescribedspecimen-fixturecombinations.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgivenin......
【中国标准分类号】:Q32
【国际标准分类号】:81_060_20
【页数】:16P.;A4
【正文语种】:英语