ASTM C260/C260M-2010a 混凝土空气夹带预混剂的标准规格
时间:2024-05-17 16:33:56 来源: 标准资料网 作者：标准资料网 阅读：8277
【英文标准名称】:StandardSpecificationforAir-EntrainingAdmixturesforConcrete
【原文标准名称】:混凝土空气夹带预混剂的标准规格
【标准号】:ASTMC260/C260M-2010a
【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】:C09.23
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:空气含量;空气夹带预混剂;水泥;混凝土;比重;pH值;残留物
【英文主题词】:aircontent;airentrainingadmixtures;cement;concrete;specificgravity;pH;Residue
【摘要】:1.1Thisspecificationcoversmaterialsproposedforuseasair-entrainingadmixturestobeaddedtoconcretemixturesinthefield.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thetextofthisspecificationreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.
【中国标准分类号】:Q13
【国际标准分类号】:91_100_30
【页数】:3P.;A4
【正文语种】:
【英文标准名称】:StandardTestMethodsforDeposit-FormingImpuritiesinSteam
【原文标准名称】:蒸汽中沉积杂质的标准试验方法
【标准号】:ASTMD2186-2005(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2005
【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】:D19.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:deposit-forming;electricalconductivity;evaporate;gravimetric;impurities;Larsen-Lane;sodiumtracer;steam;Conductanceandconductivity(electrical)--water;Dissolvedelements(ofwater);Evaporators/evaporation;Generatormaterials--turbine;
【摘要】:Limitingtheconcentrationofdeposit-formingimpuritiesinsteamisofsignificancetoprotectbothsteamgeneratorsandsteamturbinesfromdamageordegradationofperformance,orboth.Steamenteringsuperheatersandreheatersofsteamgeneratorsalwayscontainssomeimpurities.Iftheconcentrationofimpuritiesissufficientlylow,theimpuritiesaredissolvedinsuperheatedsteamandarecarriedoutofthesteamgenerator.However,ifthesteamcontainsasufficientamountofanysubstancetoexceeditssolubilitylimitinsteam,thesubstanceislikelytoformadepositontheheat-transfersurface.Becauseheattransferinsuperheatersandreheatersinfossil-fueledsteamgeneratorsiscontrolledprincipallybythelowheat-transfercoefficientonthegasside,theformationofsteam-sidedepositswillhavelittleeffectontheoverallheat-transferrate.However,steam-sidedepositswillincreasetheoperatingtemperatureoftheheat-transfersurface.Suchtemperatureincreasescanleadtoswellingandultimatelytoruptureofthetubing.Also,aggressivematerialscanconcentrateundersoliddepositsofporousmaterials,suchasmagnetite(Fe3O4),andcancauseseriouscorrosionofthetubing.Assteamflowsthroughturbines,itstemperatureandpressuredecreaserapidly.Becausetheabilityofsteamtodissolveimpuritiesdecreaseswithdecreasingtemperatureandpressure,impuritiesinsteammayexceedtheirsolubilitylimitandformdepositsontheturbine.Suchdepositsreducesteamflowarea,particularlyinthehigh-pressureportionoftheturbinewhereflowpassagesaresmall,andtheroughnessofdepositsandtheireffectonbladecontoursresultinlossesofturbineefficiency.Alloftheseeffectsleadtoreductionoftheplantmaximumcapacity,whichappreciablyreducesthefinancialreturnonthecapitalinvestmentinthepowerplant.Furthermore,aggressivematerials,suchassodiumhydroxide(NaOH)andsodiumchloride(NaCl),maycondenseanddepositonturbinesurfaces.Suchdepositsoccasionallycontributetofailureduetocrackingofhighlystressedturbinebladesandrotors.Repairsandoutagesareextremelycostly.Bymonitoringtheconcentrationofdeposit-formingimpuritiesinsteam,apowerplantoperatorcantakestepsnecessarytolimittheimpuritiestotolerableconcentrationsandthusminimizeoreliminatelossesduetoexcessivedeposits.1.1Thesetestmethodscoverthedeterminationoftheamountofdeposit-formingimpuritiesinsteam.Determinationsaremadeoncondensedsteamsamplesinalltestmethods.TestMethodsA,B,andCgiveameasureoftheamountoftotaldeposit-formingmaterialpresent;TestMethodDdealswithspecialconstituentsthatmaybepresent.Specialprecautionsandequipment,calculationprocedures,andrangesofapplicabilityaredescribed.Thefollowingtestmethodsareincluded:
Sections
TestMethodA(GravimetricorEvaporative)
6to12
TestMethodB(ElectricalConductivity)
13to19
TestMethodC(SodiumTracer)
20to26
TestMethodD(SilicaandMetals)
27to30
【英文标准名称】:Board--Determinationofpunctureresistance
【原文标准名称】:纸板.耐刺穿强度的测定
【标准号】:JISP8134-1998
【标准状态】:现行
【国别】:日本
【发布日期】:1998-01-20
【实施或试行日期】:
【发布单位】:日本工业标准调查会(JP-JISC)
【起草单位】:TechnicalCommitteeonPaperandPulp
【标准类型】:()
【标准水平】:()
【中文主题词】:材料强度;冲击试验;纸板;穿孔试验
【英文主题词】:board(paper);perforatingtests;impacttesting;strengthofmaterials
【摘要】:この規格は,板紙の衝撃あな開け強さ試験方法について規定する。
【中国标准分类号】:Y31
【国际标准分类号】:85_060
【页数】:11P;A4
【正文语种】:日语