1、Designation: D 6929 04Standard Practice forFreezing of Emulsified Asphalts1This standard is issued under the fixed designation D 6929; 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 parenthes
2、es indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 Emulsified asphalt is normally damaged by freezingtemperatures, but spec
3、ially formulated materials are expectedto pass this practice.1.2 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-
4、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 temperatures of 18C.3. Sampl
5、e 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 relieve pressure. Aft
6、er 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.NOTE 1Emulsified asphalts with viscosity testing requirements of25C may
7、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 size.5. Pr
8、ocedure5.1 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 by expos
9、ure 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 whichcannot be r
10、endered homogeneous by stirring at laboratorytemperature.6. Report6.1 Report the result of this practice as either Homogeneousor Broken.7. Keywords7.1 asphalt; asphalt emulsion; emulsified asphalt; cationicemulsified asphalt; freezing; frost1This practice is under the jurisdiction of ASTM Committee
11、D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Tests.Current edition approved Aug. 1, 2004. Published August 2004.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM Inte
12、rnational 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
13、 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 sho
14、uld be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Sta
15、ndards, 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).D6929042
