1、Designation:D3791/D3791M11(Reapproved 2018)Standard 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 year of l
2、ast revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers a procedure for evaluating some ofthe effects on asphalts of heating in the presence of little or noair
3、.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.Combiningvalues from the two systems may result in non-conformancewith the
4、 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior t
5、o use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarrie
6、rs to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D5/D5M Test Method for Penetration of Bituminous Mate-rialsD36/D36M Test Method for Softening Point of Bitumen(Ring-and-Ball Apparatus)D140/D140M Practice for Sampling Asphalt MaterialsD1079 Terminology Relating to Roofing and Water
7、proofingD2170/D2170M Test Method for Kinematic Viscosity ofAsphalts(Bitumens)D2171/D2171M Test Method for Viscosity of Asphalts byVacuum Capillary ViscometerD4402/D4402M Test Method for Viscosity Determination ofAsphalt at Elevated Temperatures Using a RotationalViscometerE1 Specification for ASTM L
8、iquid-in-Glass ThermometersE145 Specification for Gravity-Convection and Forced-Ventilation OvensE230/E230M Specification for Temperature-ElectromotiveForce(emf)Tables for Standardized ThermocouplesE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers3.Terminology3.1 Definition
9、sDefinitions 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 isheated to a temperature chosen by the investigator for a periodof 5 h 6 10 min.Certain characteristics of the asphalt after heatexposure at the t
10、est temperature chosen are then compared withthose characteristics before exposure.NOTE1Aset temperature is required when this practice is used as partof a specification.Historically,a temperature of 204C 400F has beenused.5.Significance and Use5.1 When asphalts are maintained at elevated temperatur
11、esin the presence of air,their characteristics may change.Certainblown asphalts also soften when maintained near,and particu-larly above,their final blowing temperatures under virtuallyair-free conditions.This may happen if the asphalt is over-heated for application purposes.This practice provides a
12、uniform heat-treatment procedure and methods for evaluatingthe effect of this treatment on some of the characteristics ofasphalts.Changes observed when asphalts are overheated arenot indicative of changes to be expected when asphalts areheated to normal application temperatures.6.Apparatus6.1 OvenA
13、forced-ventilation oven conforming to therequirements for Type IIA as prescribed in Specification E145,1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.03 on Surfacingand Bituminous Materials for Membrane W
14、aterproofing and Built-up Roofing.Current edition approved May 1,2018.Published June 2018.Originallyapproved in 1979.Last previous edition approved in 2011 as D3791/D3791M 11.DOI:10.1520/D3791_D3791M11R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Serv
15、ice at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordan
16、ce with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 capable of maintaining temperatures up to 300C 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 requireme
