1、Designation:D3791/D3791M11Standard 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 last revision.A nu
2、mber 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.1.2 The values s
3、tated 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 standard.1.3 Thi
4、s 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 and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1
5、 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 Terminology Relating to Roofing and WaterproofingD2170 Test Method for Kinematic Viscosity of Asphalts(Bi
6、tumens)D2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD4402 Test Method for Viscosity Determination of Asphaltat Elevated Temperatures Using a Rotational ViscometerE1 Specification for ASTM Liquid-in-Glass ThermometersE145 Specification for Gravity-Convection and Forced-Ven
7、tilation OvensE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized ThermocouplesE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers3.Terminology3.1 DefinitionsDefinitions of terms used in this practicecan be found in Terminology D1079.4.Summary o
8、f 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 test temperature chosen are then compared withthose characteristics before exposure.NOTE1
9、Aset 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 temperaturesin the presence of air,their characteristics may change.Certainblown asphalts also sof
10、ten 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 auniform heat-treatment procedure and methods for evaluatingthe effect of this treatment
11、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 forced-ventilation oven conforming to therequirements for Type IIA as prescribed in Spec
12、ification E145,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 requirements for Thermometers 7C or 7F asprescribed in Sp
13、ecification E1.6.2.1 As an alternative,any other thermometric device usedshall be at least:(1)of equal accuracy to that of the thermom-eter specified in Specification E1,(2)capable of indicating1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direc
14、t responsibility of Subcommittee D08.03 on Surfacingand Bituminous Materials for Membrane Waterproofing and Built-up Roofing.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 1979.Last previous edition approved in 2011 as D3791/D3791M 04(2011)1.DOI:10.1520/D3791_D3791
15、M11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service 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
16、,West Conshohocken,PA 19428-2959.United States1 temperature to within 1C 2F,and(3)stable to within 1C2F for the duration of the exposure.6.2.2 When used,platinum resistance thermometers shall bein accordance with the requirements of Specification E1137/E1137M.6.2.3 When used,thermocouples shall be in accordancewith the requirements of Specification E230.6.3 Containers,triple-seal,friction-top,1-L 1-qt and 0.5-L1-pt cans with lids,free of any interior resinous or lacquercoatings.6.4 Laboratory Ti
