1、Designation:D692910Standard Practice forFreezing of Emulsified Asphalts1This standard is issued under the fixed designation D6929;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 indic
2、ates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 Emulsified asphalt is normally damaged by freezingtemperatures,but specially formulated materials are expectedto pass this practice.1.2 The values stated in SI units
3、are to be regarded asstandard.No other units of measurement are included in thisstandard.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 a
4、nd determine the applica-bility of regulatory limitations prior to use.2.Significance and Use2.1 Certain agencies,who desire to use,store,or transportemulsified asphalt under less than ideal weather conditions,may require that the product remain homogeneous(unbroken)after being subjected to temperat
5、ures of 18C.3.Sample Conditioning3.1 All emulsified asphalts shall be properly stirred toachieve homogeneity.3.2 All emulsified asphalts with viscosity testing require-ments of 50C shall be heated to 50 6 3C in the originalsample container in a water bath or oven.The container shouldbe vented to rel
6、ieve pressure.After the sample reaches 50 63C,stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing requirementsof 25C should be mixed or stirred at 25 6 3C in the originalsample container to achieve homogeneity.NOTE1Emulsified asphalts with viscosity testing requirem
7、ents 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.Apparatus4.1 FreezerCapable of maintaining a test temperature of-1865C.4.2 Metal Containersuch as a 500 mL press-top can.4.3 Glass Stirring Rodof optional
8、 size.5.Procedure5.1 Place approximately 400 g of the emulsified asphalt in aclean metal container.5.2 Expose the emulsified asphalt in the closed container toan air temperature of 18 6 5C for 12 to 18 consecutivehours.5.3 At the expiration of the freezing period,permit theemulsified asphalt to thaw
9、 by exposure of the container toambient temperature.5.4 Repeat the freezing and thawing periods until theemulsified asphalt has been subjected to three cycles offreezing and thawing.5.5 After the third cycle,the emulsified asphalt may behomogeneous or may have separated into distinct layers whichcan
10、not be rendered homogeneous by stirring at laboratorytemperature.6.Report6.1 Report the result of this practice as either Homogeneousor Broken.7.Keywords7.1 asphalt;asphalt emulsion;cationic emulsified asphalt;emulsified asphalt;freezing;frost1This practice is under the jurisdiction of ASTM Committe
11、e D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved Dec.1,2010.Published March 2011.Originallyapproved 2004 as D692904.DOI:10.1520/D6929-10Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Cons
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15、iews known to the ASTM Committee on Standards,at the address shown below.This standard is copyrighted by ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585(phone),610-832-9555(fax),or serviceastm.org(e-mail);or through the ASTM website(www.astm.org).Permission rights to photocopy the standard may also be secured from the ASTM website(www.astm.org/COPYRIGHT/).D6929 102