DIN EN 933-4 Berichtigung 1-2008 集料几何特性试验.第4部分:颗粒形状的测定.形状指数.技术勘误DINEN933-4-2008

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【英文标准名称】:Testsforgeometricalpropertiesofaggregates-Part4:Determinationofparticleshape-Shapeindex;GermanversionEN933-4:2008,CorrigendumtoDINEN933-4:2008-06
【原文标准名称】:集料几何特性试验.第4部分:颗粒形状的测定.形状指数.技术勘误DINEN933-4-2008
【标准号】:DINEN933-4Berichtigung1-2008
【标准状态】:现行
【国别】:德国
【发布日期】:2008-09
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:集料;特性;混凝土结构;建筑;施工材料;测定;量规;几何特性;几何;颗粒形状;粒度;粒度分选;砾石;实验室试验;材料测试;数学计算;测量;测量仪器;测量试样;测量技术;矿质集料;天然石料;粒状材料;筑路石集料;岩石;毛石;形状;游标规;石;试验设备;测试;测试装置;游标卡尺
【英文主题词】:Aggregates;Characteristics;Concretestructures;Construction;Constructionmaterials;Determination;Gauges;Geometricalproperties;Geometry;Grainshapes;Grainsize;Grainsizing;Gravel;Laboratorytesting;Materialstesting;Mathematicalcalculations;Measurement;Measuringinstruments;Measuringsamples;Measuringtechniques;Mineralaggregates;Naturalstones;Particulatematerials;Roadstoneaggregates;Rocks;Rubble;Shape;Slidegauge;Stone;Testequipment;Testing;Testingdevices;Verniercalipers
【摘要】:
【中国标准分类号】:Q13
【国际标准分类号】:91_100_15
【页数】:2P.;A4
【正文语种】:德语

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Product Code:SAE J1787
Title:Measurement of the Total Ash Content of Aviation Piston Engine Oils by a Calculation Method
Issuing Committee:E-38, Aviation Piston Engine Fuels And Lubricants
Scope:This SAE Recommended Practice describes an empirical method for determining the theoretical ash content of aviation piston engine lubricating oils by calculating the equivalent weight of metallic oxides formed at 775 掳C based on the metallic elemental concentration.The calculation method of ash determination may be used as an alternate to ASTM D 482 for application to the standards for aviation piston engine lubricating oils.Field of ApplicationThis procedure is recommended for use in the qualification, manufacturing, and quality assurance testing of aviation piston engine lubricating oils where the ash content is limited to a maximum of 0.011%.BackgroundThe ash content as measured by ASTM D 482 has very poor precision and repeatability for lubricants having low ash content. The precision statement for the method states that the reproducibility of a sample in the range of 0.001 to 0.079% ash content is 0.005%. Further, the bias of the test cannot be determined and there is no standard reference material containing a known level of ash for this method. This poor precision has led to numerous problems concerning the actual ash content of products on many occasions. The test method is valuable when run by experienced operators, but can provide dubious information if run under the general conditions stated in the method. For example, to obtain repeatable results, a platinum crucible must always be used in place of the silica or porcelain crucibles listed as equivalent substitutes. Meticulous care and procedural knowledge must be used by experienced operators for the method to be productive.The notes provided in ASTM D 482 also suggest that this method may not be appropriate for oils containing ashless additives or for oils containing certain phosphorous compounds which may now be in use in aviation lubricants. For oils containing additives an alternate method, ASTM D 874, is suggested. However, ASTM D 874 includes additional restrictions and reservattions which question the suitability of that method as an acceptable alternate or replacement for ASTM D 482 for low ash containing lubricating oils.