ASTM D3791 D3791M-2004(2011)e1 Standard Practice for Evaluating the Effects of Heat on Asphalts《评价热对沥青影响的标准操作规程》.pdf
《ASTM D3791 D3791M-2004(2011)e1 Standard Practice for Evaluating the Effects of Heat on Asphalts《评价热对沥青影响的标准操作规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D3791 D3791M-2004(2011)e1 Standard Practice for Evaluating the Effects of Heat on Asphalts《评价热对沥青影响的标准操作规程》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D3791/D3791M 04 (Reapproved 2011)1Standard Practice forEvaluating the Effects of Heat on Asphalts1This standard is issued under the fixed designation D3791/D3791M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially revised in June 2011.1. Scope1.1 This practice covers a procedure for evaluating some
3、 ofthe effects on asphalts of heating in the presence of little or noair.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other
4、. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices a
5、nd determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D5 Test Method for Penetration of Bituminous MaterialsD36 Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)D140 Practice for Sampling Bituminous MaterialsD1079 Termino
6、logy Relating to Roofing and WaterproofingD2170 Test Method for Kinematic Viscosity of Asphalts(Bitumens)D2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD4402 Test Method for Viscosity Determination of Asphaltat Elevated Temperatures Using a Rotational ViscometerE1 Specifica
7、tion for ASTM Liquid-in-Glass ThermometersE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3. Terminology3.1 DefinitionsDefinitions of terms used in this practicecan be found in Terminology D1079.4. Summary of Practice4.1 A sample of asphalt in a loosely covered container isheat
8、ed to a temperature chosen by the investigator for a periodof5h6 10 min. Certain characteristics of the asphalt after heatexposure at the test temperature chosen are then compared withthose characteristics before exposure.NOTE 1Aset temperature is required when this practice is used as partof a spec
9、ification. Historically, a temperature of 204C 400F has beenused.5. Significance and Use5.1 When asphalts are maintained at elevated temperaturesin the presence of air, their characteristics may change. Certainblown asphalts also soften when maintained near, and particu-larly above, their final blow
10、ing temperatures under virtuallyair-free conditions. This may happen if the asphalt is over-heated for application purposes. This practice provides auniform heat-treatment procedure and methods for evaluatingthe effect of this treatment on some of the characteristics ofasphalts. Changes observed whe
11、n asphalts are overheated arenot indicative of changes to be expected when asphalts areheated to normal application temperatures.6. Apparatus6.1 OvenA forced-ventilation oven conforming to therequirements for Type IIA as prescribed in Specification E145,capable of maintaining temperatures up to 300C
12、 572F, andwith a chamber at least 300 by 300 by 300 mm 12 by 12 by12 in.6.2 ThermometerASTM Low-Distillation Thermometer,having a range from 1 to + 300C 30 to 580F andconforming to the requirements for Thermometers 7C or 7F asprescribed in Specification E1.1This practice is under the jurisdiction of
13、ASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.03 on Surfacingand Bituminous Materials for Membrane Waterproofing and Built-up Roofing.Current edition approved May 1, 2011. Published June 2011. Originallyapproved in 1979. Last previous edition app
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