ASTM_D_6998_-_19.pdf

Designation:D699819Standard Practice forEvaluating Aggregate Coating using Emulsified Asphalts1This standard is issued under the fixed designation D6998;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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 practice covers those emulsified asphalts intendedfor use by mixing with aggregate.It is not applicable torapid-setting types or diluted materials used for tack coats,priming,or mulch treatments.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 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 to use.1.5 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Sample Conditioning for Testing3.1 All emulsified asphalts shall be properly stirred toachieve homogeneity.3.2 All emulsified asphalts with viscosity testing require-ments of 50 C shall be conditioned to 50 6 3 C in a samplecontainer in a water bath or oven.The container should bevented to relieve pressure.After the sample reaches 50 6 3 C,stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing requirementsof 25 C shall be conditioned to 25 6 3 C in a samplecontainer to achieve homogeneity.After the sample reaches 256 3 C,stir the sample to achieve homogeneity.NOTE1Emulsified asphalts with viscosity testing requirements of25 C may be heated and stirred as specified in 3.2,if necessary.In theevent the 3.2 method is used,the sample should be cooled to 25 6 3 C.4.Significance and Use4.1 The intent of this practice is to ensure that a givenmixing grade emulsified asphalt is stable enough and otherwisepossesses the ability to mix with a reference stone for theprescribed time,and coat it uniformly and thoroughly.NOTE2The quality of the results produced by this standard aredependent on the competence of the personnel performing the procedureand the capability,calibration,and maintenance of the equipment used.Agencies that meet the criteria of Specification D3666 are generallyconsidered capable of competent and objective testing,sampling,inspection,etc.Users of this standard are cautioned that compliance withSpecification D3666 alone does not completely ensure reliable results.Reliable results depend on many factors;following the suggestions ofSpecification D3666 or some similar acceptable guideline provides ameans of evaluating and controlling some of those factors.5.Apparatus and Material5.1 SievesStandard 19.0-mm and 6.3-mm sieves conform-ing to Specification E11.5.2 SpatulaA steel spatula or its equivalent,having ablade approximately 200 mm in length.5.3 Mixing ContainerA container of approximately 1-Lcapacity(for example,round-bottom iron dish,kitchensaucepan,pie tin,stainless steel bowl).5.4 StoneAsupply of reference stone(hard limestone,traprock,or other type)which has been washed with water anddried before using.All stone shall pass through the standard19.0-mm sieve and not more than 5%shall pass through the6.3-mm sieve.NOTE3Each laboratory should select its own reference stone supply,1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved Dec.1,2019.Published January 2020.Originallyapproved in 2004.Last previous edition approved in 2011 as D6998 11.DOI:10.1520/D6998-19.2For 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,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision