ASTM_D_6998_-_11.pdf

Designation:D699811Standard 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 are to be regarded as standard.No other units of measurement are included in this standard.1.3 This practice 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 ASTM Standards:2E11 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 50C shall be conditioned to 50 6 3C in a samplecontainer in a water bath or oven.The container should bevented to relieve pressure.After the sample reaches 50 6 3C,stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing requirementsof 25C shall be conditioned to 25 6 3C in a sample containerto achieve homogeneity.the sample reaches 25 6 3C,stir thesample to achieve homogeneity.NOTE1Emulsified asphalts with viscosity testing requirements of25C 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 3C.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.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.NOTE2Each laboratory should select its own reference stone supply,the source of which is not apt to change;this is to obviate rapid changesin the character of reference stone used in any one laboratory,since theextent of coating may be aggregate dependent.5.5 Balance,capable of weighing 1000 g to within 6 0.1 g.6.Procedure6.1 Weigh 465.0 6 1.0 g of stone into the metal pan.6.2 Add 35.0 6 0.1 g of the emulsified asphalt to the stonein the pan,and mix vigorously with the spatula for 3 min.NOTE3An equivalent ratio of 93%stone and 7%emulsified asphaltmay be used.7.Report7.1 Report whether or not there is appreciable separation ofthe asphaltic base from the water of the emulsified asphalt,andwhether or not the stone is uniformly and thoroughly coatedwith the emulsified asphalt.8.Keywords8.1 asphalt;asphalt emulsion;cationic emulsified asphalt;coating;emulsified asphalt1This 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 July 1,2011.Published August 2011.Originallyapproved 2004.Last previous edition published 2004 as D699804.DOI:10.1520/D6998-11.2For 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 States1 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.Your comments will rec