1、Designation: D7404 07 (Reapproved 2012)Standard Test Method forDetermination of Emulsified Asphalt Residue by MoistureAnalyzer1This standard is issued under the fixed designation D7404; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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 1.1 This test method covers a rapid and quantitativedetermination of the residue in emulsified asphalts
3、 using amoisture analyzer. It is applicable to all nonsolvent-containingemulsion types.1.2 The values stated in SI units are to be regarded as thestandard.1.3 A precision and bias statement for this test method hasnot been completed at this time. Therefore, this test methodshould not be used for acc
4、eptance or rejection of a material forpurchasing purposes.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 and health practices and determine the applica-bil
5、ity of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D977 Specification for Emulsified AsphaltD2397 Specification for Cationic Emulsified AsphaltD6934 Test Method for Residue by Evaporation of Emul-sified AsphaltD6997 Test Method for Distillation of Emulsified Asphal
6、t3. Summary of Test Method3.1 A sample of emulsified asphalt is placed in an opensample tray with an appropriate liquid transfer device capableof handling 1- to 3-mL sample sizes. The sample is heated toa preset temperature as required by emulsion type but neverexceeding 163C to determine the percen
7、tage of asphaltresidue.4. Significance and Use4.1 This test is used to indicate the compositional charac-teristics of emulsified asphalt and is applicable to anionicemulsified asphalts as described in Table 1 of SpecificationD977 and cationic emulsified asphalt as described in Table 1 ofSpecificatio
8、n D2397 except solvent-containing emulsions. Theresidue obtained from this test method may also be subjected torheological characterizations.5. Apparatus5.1 Glass Rods, with flame-polished ends used for stirringthe emulsion as described in Test Method D6934.5.2 Moisture Balance Analyzer, equipped wi
9、th a heatingelement and capable of running either isothermally or in aprogrammable temperature-gradient mode.36. Sample Conditioning for Testing6.1 All emulsified asphalts shall be properly stirred toachieve homogeneity before testing as described in TestMethod D6934.6.2 A minimum of1gandupto3gisuse
10、d to determine theemulsified asphalt residue.7. Calibration and Standardization7.1 Follow the manufacturers guidelines for calibration andstandardization.8. Procedure8.1 Polymer-Modified Emulsified Asphalts8.1.1 Program the moisture analyzer for an isothermal runset for an end temperature of 100C wi
11、th a switch-off criterionof 1 mg for 140 s or higher times for the highest accuracy. Forlower accuracy, set the instrument at 1 mg for 50 s or lowertimes for a faster run. The automatic switch-off criterion is usedto set the instruments sensitivity for higher accuracy (1 mg for140 s or longer times)
12、 or for lower accuracy (1 mg for 50 s orlower times).1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.42 onEmulsified Asphalt Test.Current edition approved June 1, 2012. Published June 2012. DOI: 10.152
13、0/D7404-07R12.2For 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.3The moisture balance analyzer is available com
14、mercially from differentmanufacturers.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.1.2 Monitor the residue continuously and print a record atthe end of the run if a documented report is required.8.2 Nonpolymer Emulsified Asphalt
15、s and Temperature-Gradient RunProgram the moisture analyzer for an isother-mal run set for an end temperature of 163C with a switch-offcriterion of 1 mg for 140 s or longer times for the highestaccuracy. Set the instrument at 1 mg for 50 s or shorter timesfor a faster run and a lower accuracy. Use t
16、he switch-offcriterion to set the instruments sensitivity as described aboveto stop the test automatically when the change in weight iswithin 1 mg for 140 s or longer times (higher accuracy) or 1 mgfor 50 s or shorter times (lower accuracy).NOTE 1Although this test method is not for solvent-containi
17、ngemulsions, some guidance is given for practitioners who desire to obtainresidue for emulsions of that type. Program the moisture analyzer to runin the temperature-gradient mode by setting the start temperature at 50Cand setting the ramp temperature at 10/min and the end temperature to100C if the e
18、mulsion also contains polymer. Set the end temperature to163C if the solvent-containing emulsion does not contain polymer. Inboth cases, set the switch-off criterion to 1 mg for 140 s (see AppendixAppendix X1) or longer times for higher accuracy and to 1 mg for 50 s orshorter times if a lower accura
19、cy is desired.9. Calculation9.1 The instrument calculates the residue automatically atthe end of the run. This report can be attached to any other finalreport that is desired. In some cases, a plot of the rate of watermoisture loss can be done.10. Report10.1 Report the residue to the nearest 0.1 %.1
20、1. Precision and Bias11.1 PrecisionThe following criteria should be used forjudging the acceptability of results (95 % probability); dupli-cate results by the same operator should not be consideredsuspect unless they differ by more than the following amount:Residue by Evaporation Weight, % Repeatabi
21、lity, Weight %50 to 75 0.111.2 BiasThe bias for this test method cannot be deter-mined because no suitable material with an accepted referencevalue is available.12. Keywords12.1 asphalt; emulsified asphalt; emulsified asphalt; isother-mal run; moisture balance analyzer; residue; temperaturegradientA
22、PPENDIX(Nonmandatory Information)X1. COMPARISON RESIDUE BY EVAPORATION (D6934) VERSUS MOISTURE ANALYZER (Fig. X1.2)X1.1 Data for the moisture analyzer was obtained bysetting the switch-off criterion of 1 mg for 140 s for all runs andrunning in the isothermal mode as follows: for unmodifiedasphalt em
23、ulsions, the temperature was set at 163C, and forFIG. X1.1 Comparison of % Residue by Different Procedures: Moisture Analyzer (MA), Evaporation (D6934), and Distillation (D6997)asPerformed by Two Different LaboratoriesD7404 07 (2012)2polymer modified asphalt emulsions, the temperature was set at100C
24、. Emulsion types tested were cationics and anionics atslow, medium, and rapid settings.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
25、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. Y
26、our comments are invited either for revision of this standard or for additional standardsand should 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 commen
27、ts have not received a fair hearing you shouldmake your views 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 mu
28、ltiple 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/).FIG. X1.2 Comparison Residue by Evaporation (D6934) Versus Moisture AnalyzerD7404 07 (2012)3
