1、Designation:D740520Standard Test Method forMultiple Stress Creep and Recovery(MSCR)of AsphaltBinder Using a Dynamic Shear Rheometer1,2This standard is issued under the fixed designation D7405;the number immediately following the designation indicates the year oforiginal adoption or,in the case of re
2、vision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of percentrecovery and non-recoverable creep compliance of asp
3、haltbinders by means of multiple stress creep and recovery(MSCR)testing.The MSCR test is conducted using thedynamic shear rheometer(DSR)at a specified temperature.1.2 This standard is appropriate for unaged material,mate-rial aged in accordance with Test Method D2872(RTFOT),material aged in accordan
4、ce with Practice D6521(PAV),andmaterial aged in accordance with both Test Method D2872 andPractice D6521.NOTE1The majority of development work on this test method wasperformed on material aged in accordance with Test Method D2872(RTFOT).1.3 The percent recovery is intended to provide a means todeter
5、mine the presence of elastic response and stress depen-dence of polymer-modified and unmodified asphalt binders.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 The text of this standard references notes and footnoteswhich
6、 provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.6 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 stan
7、dard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on
8、Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Ma
9、terialsD8 Terminology Relating to Materials for Roads and Pave-mentsD2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt(Rolling Thin-Film Oven Test)D3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD5801 Test Method for Tou
10、ghness and Tenacity of AsphaltMaterialsD6084/D6084M Test Method for Elastic Recovery of As-phalt Materials by DuctilometerD6373 Specification for Performance Graded AsphaltBinderD6521 Practice for Accelerated Aging of Asphalt BinderUsing a Pressurized Aging Vessel(PAV)D7175 Test Method for Determini
11、ng the Rheological Prop-erties of Asphalt Binder Using a Dynamic Shear Rheom-eter2.2 AASHTO Standards:4M 332 Specification for Performance-Graded AsphaltBinder Using Multiple Stress Creep Recovery(MSCR)TestT 350 Method of Test for Multiple Stress Creep Recovery(MSCR)Test of Asphalt Binder Using a Dy
12、namic ShearRheometer(DSR)3.Terminology3.1 DefinitionsFor definitions of general terms used in thisstandard,refer to Terminology D8.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.44 onRheological Tests
13、.Current edition approved March 1,2020.Published March 2020.Originallyapproved in 2008.Last previous edition approved in 2015 as D7405 15.DOI:10.1520/D7405-20.2This test method is based on a work product of the Federal HighwayAdministration.A similar standard is published as AASHTO TP 70.3For refere
14、nced 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.4Available from American Association of State Highway and TransportationOffic
15、ials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles
16、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.3.2 Definitions of Terms Specific to This Standard:3.2.1 creep and recovery,na standard rheological testprotocol whereby a specimen is subjected to a constant load fora fixed time period then allowed to recover at zero load for afixed time period.3.2.2 non-recoverable creep compliance