1、Designation:D7741/D7741M18Standard Test Method forMeasurement of Apparent Viscosity of Asphalt-Rubber orOther Asphalt Binders by Using a Rotational HandheldViscometer1This standard is issued under the fixed designation D7741/D7741M;the number immediately following the designation indicates theyear o
2、f original adoption or,in the case of revision,the year 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.1.Scope1.1 The use of high-viscosity asphalt binders like asphalt-rubber is
3、 becoming more common in the United States andworldwide.Specifications such as Specification D6114 note theneed for field control of the apparent viscosity and require theuse of a field production rotational viscometer.The testing ofasphalt-rubber binder for use in asphalt-rubber hot mix and forasph
4、alt-rubber membrane is necessary to ensure consistent mixproperties that will ensure good performance of these materi-als.Logistics of field applications limits the use of conven-tional laboratory controls and testing equipment.This test,using a handheld rotational viscometer,can be conducted ineith
5、er the field or laboratory to determine the apparent viscosityof asphalt-rubber and other high-viscosity binders for fieldproduction control and to assess the uniformity of the binderproduced,or for other related purposes.1.2 Asphalt-rubber binder consists of a blend of pavinggrade asphalt cement an
6、d crumb rubber as described inSpecification D6114.Other high-viscosity asphalt binders mayconsist of asphalts modified with polymer or fiber,or both.Testing is performed following the specified reaction time,ifany,within the production process.Control of the raw materi-als is separate from the test.
7、1.3 The values stated in SI units or inch-pound units are tobe regarded separately as standard.The values stated in eachsystem may not be exact equivalents;each system shall be usedindependently of the other.Combining values from the twosystems may result in noncompliance with the standard.1.4 This
8、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 to use.1.5 This inte
9、rnational 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 TechnicalBarriers to Trade(TBT)Com
10、mittee.2.Referenced Documents2.1 ASTM Standards:2D6114 Specification for Asphalt-Rubber Binder3.Significance and Use3.1 This test is primarily used for field production control ofasphalt-rubber(A-R)and other high-viscosity binders;however,the test can also be used in a laboratory setting.3.2 A handh
11、eld rotational viscometer is used to measure theapparent viscosity of a completed blend of A-R or high-viscosity binder.A rotor(spindle),turning at constant speed,isinserted in the liquid binder to be measured.The resistance tomovement of the spindle(torque)caused by the viscosity of thesurrounding
12、liquid is measured using a special mechanism toobtain direct readings in Pas or cP.NOTE1Spindle is generally made of stainless steel,although anothermetal such as brass could be used.3.3 The measured apparent viscosity is used to control theproduction of the A-R or other high-viscosity binder,to ass
13、essthe uniformity of the binder produced,or for other relatedpurposes.3.4 As the spindle turns in the A-R or other high-viscositybinder,it has a tendency to“drill”into the sample(that is,forA-R,the spindle spins the rubber particles out of the measure-ment area).Consequently,the apparent viscosity d
14、rops toreflect only the liquid phase of the high-viscosity binder.Therefore,the peak viscosity measurement value is recorded toreflect the viscosity of the blended material.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility
15、of Subcommittee D04.44 onRheological Tests.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 2011.Last previous edition approved in 2017 as D7741/D7741M 11(2017).DOI:10.1520/D7741_D7741M-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
16、 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,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued