1、Designation: D6929 10D6929 16Standard Practice for toFreezing ofEvaluate the Effect of Freezing on EmulsifiedAsphalts1This 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 ye
2、ar 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 Emulsified asphalt is normally damaged by freezing temperatures, but specially formulated materials are expected
3、 to passthis practice.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes(excluding those in tables and
4、 figures) shall not be considered as requirements of the standard.1.4 This practice does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the app
5、licability of regulatorylimitations prior to use.2. Significance and Use2.1 Certain agencies,agencies who desire to use, store, or transport emulsified asphalt under less than ideal weatherconditions,conditions may require that the product remain homogeneous (unbroken) after being subjected to tempe
6、ratures atemperature of 18C.18 C.3. Sample Conditioning3.1 All emulsified asphalts shall be properly stirred to achieve homogeneity.3.2 All emulsified asphalts with viscosity testing requirements of 50C50 C shall be heated to 50 6 3C3 C in the originalsample container in a water bath or oven. The co
7、ntainer should be vented to relieve pressure. After the sample reaches 50 63C,3 C, stir the sample to achieve homogeneity.3.3 Emulsified asphalts with viscosity testing requirements of 25C25 C should be mixed or stirred at 25 6 3C3 C in theoriginal sample container to achieve homogeneity.NOTE 1Emuls
8、ified asphalts with viscosity testing requirements of 25C25 C may be heated and stirred as specified in 3.2, if necessary. In the eventthe 3.2 method is used, the sample should be cooled to 25 6 3C.3 C.4. Apparatus4.1 FreezerCapable of maintaining a test temperature of -1865C.18 6 5 C.4.2 Metal Cont
9、ainersuch as a 500 mL 500-mL press-top can.4.3 Glass Stirring Rodof optional size.5. Procedure5.1 Place approximately 400 g of the emulsified asphalt in a clean metal container.5.2 Expose the emulsified asphalt in the closed container to an air temperature of 1865C5 C for 12 to 18 consecutive hours.
10、5.3 At the expiration of the freezing period, permit the emulsified asphalt to thaw by exposure of the container to ambienttemperature.1 This practice is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.42 on EmulsifiedAsp
11、halt Test.Current edition approved Dec. 1, 2010Dec. 1, 2016. Published March 2011January 2017. Originally approved 2004 in 2004. Last previous edition approved in 2010 asD6929D6929 10.04. DOI: 10.1520/D6929-1010.1520/D6929-16.This document is not an ASTM standard and is intended only to provide the
12、user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard
13、 as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.4 Repeat the freezing and thawing periods until the emulsified asphalt has been subjected to three cycles of freezing an
14、dthawing.5.5 After the third cycle, the emulsified asphalt may be homogeneous or may have separated into distinct layers which cannotbe rendered homogeneous by stirring at laboratory temperature.broken.NOTE 2An emulsified asphalt is considered broken when it may have separated into distinct layers w
15、hich cannot be rendered homogeneous by stirringat laboratory conditions.6. Report6.1 Report the result of this practice as either Homogeneous or Broken.7. Keywords7.1 asphalt; asphalt emulsion; broken; cationic emulsified asphalt; emulsified asphalt; freezing; freezingfrostD6929 162ASTM Internationa
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