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【英文标准名称】:StandardTestMethodforPotentialAlkaliReactivityofCement-AggregateCombinations(Mortar-BarMethod)
【原文标准名称】:水泥集料混合物的潜在碱反应性的标准试验方法(灰浆棒法)
【标准号】:ASTMC227-2010
【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】:C09.26
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:聚集体;碱硅反应;水泥;长度变化;灰浆;聚集体(潜在碱反应性);水泥集料混合;长度改变;灰浆棒;容积测量-水泥/混凝土
【英文主题词】:aggregate;alkali-silicareaction;cement;lengthchange;mortar;Aggregate(potentialalkalireactivity);Cement-aggregatecombinations;Changeinlength;Mortarbars;Volumetricmeasurement--cement/concrete
【摘要】:Datacorrelatingtheresultsoftestsperformedusingthistestmethodwithperformanceofcement-aggregatecombinationsinconcreteinservice,resultsofpetrographicexaminationofaggregates(GuideC295),andresultsoftestsforpotentialreactivityofaggregatesbychemicalmethodshavebeenpublishedinTestMethodC289andshouldbeconsultedinconnectionwiththeuseofresultsoftestsperformedusingthistestmethodasthebasisforconclusionsandrecommendationsconcerningtheuseofcement-aggregatecombinationsinconcrete.Theresultsoftestsperformedusingthismethodfurnishinformationonthelikelihoodthatacement-aggregatecombinationispotentiallycapableofharmfulalkali-silicareactivitywithconsequentdeleteriousexpansionofconcrete.Criteriatodeterminepotentialdeleteriousalkali-silicareactivityofcement-aggregatecombinationsfromtheresultsofthistestmethodhavebeengivenintheAppendixofSpecificationC33.Insignificantexpansionmayresultwhenpotentiallydeleteriouslyreactivesiliceousrocksarepresentincomparativelyhighproportionevenwhenahigh-alkalicementisused.Thismayoccurbecausethealkali-silicareactionproductsarecharacterizedbyanalkalitosilicaratiothatissolowastominimizeuptakeofwaterandswelling,orbecauseofalkalileachingfromthebars(seesectiononcontainers).Dolomiticaggregatesthataredeleteriouslyaffectedbythealkali-carbonatereactionwhenemployedascourseaggregateinconcretemaynotproducenotableexpansioninthistestmethod.Also,significantexpansionmayoccurrarelyinthetestforreasonsotherthanalkali-aggregatereaction,particularlythepresenceofsulfatesintheaggregatethatproduceasulfateattackuponthecementpaste,ferroussulfides(pyrite,marcasite,orpyrrhotite)thatoxidizeandhydratewiththereleaseofsulfate,andmaterialssuchasfreelime(CaO)orfreemagnesia(MgO)inthecementoraggregatethatprogressivelyhydrateandcarbonate.WhenexpansionsinexcessofthosegivenintheAppendixofSpecificationC33areshowninresultsoftestsperformedusingthistestmethod,itisstronglyrecommendedthatsupplementaryinformationbedevelopedtoconfirmthattheexpansionisactuallyduetoalkalireactivity.Sourcesofsuchsupplementaryinformationinclude:(1)petrographicexaminationoftheaggregatetodetermineifknownreactiveconstituentsarepresent;(2)examinationofthespecimensafterteststoidentifytheproductsofalkalireactivity;and(3)testsoftheaggregateforpotentialreactivitybychemicalmethods(TestMethodC289).Whenithasbeenconcludedfromtheresultsoftestsperformedusingthistestmethodandsupplementaryinformationasoutlinedthatagivencement-aggregatecombinationshouldbeconsideredpotentiallydeleteriouslyreactive,additionalstudiesmaybeappropriatetodevelopinformationonthepotentialreactivityofothercombinationscontainingthesamecementwithotheraggregates,thesameaggregatewithothercements,orthesamecement-aggregatecombinationwithamineraladmixture.1.1Thistestmethodcoversthedeterminationofthesusceptibilityofcement-aggregatecombinationstoexpansivereactionsinvolvinghydroxylionsassociatedwiththealkalies(sodiumandpotassium)bymeasurementoftheincrease(ordecre......
【中国标准分类号】:Q10
【国际标准分类号】:91_100_10
【页数】:6P.;A4
【正文语种】:


【英文标准名称】:Applicationguidefordistributeddigitalcontrolandmonitoringforpowerplants
【原文标准名称】:电力设备分布式数字控制及监视的应用指南
【标准号】:IEEE1046-1991
【标准状态】:作废
【国别】:美国
【发布日期】:1991
【实施或试行日期】:
【发布单位】:美国电气电子工程师学会(IEEE)
【起草单位】:IEEE
【标准类型】:()
【标准水平】:()
【中文主题词】:电气工程;发电;电力系统;监视器;数字测量仪器;发电站
【英文主题词】:Digitalmeasuringinstruments;Electricpowergeneration;Electricpowerstations;Electricpowersystems;Electricalengineering;Monitors;Powergeneratinginstallation
【摘要】:Addressesalternateapproachestothetaskofapplyingadigitalcontrolsystem,comparingrelativeadvantagesanddisadvantagesoftheseapproaches,andaddressescriteriatobeusedtojudgethesuitabilityofcommerciallyavailablesystemsforuseinthepowergenerationindustry.
【中国标准分类号】:F21
【国际标准分类号】:27_100
【页数】:105P;A4
【正文语种】:英语