1、Designation: D 7226 06Standard Test Method forDetermining the Viscosity of Emulsified Asphalts Using aRotational Paddle Viscometer1This standard is issued under the fixed designation D 7226; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method uses a paddle rotational viscometer tomeasure the apparent viscosity of emulsifi
3、ed asphalt withviscosities between 30 and 1500 mPas (centipoises) at 50C(122F). It is applicable to all emulsified asphalt described inSpecifications D 977 and D 2397.1.2 The values given in SI units are to be considered thestandard. The values given in parentheses are for informationonly.1.3 This s
4、tandard 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.
5、1 ASTM Standards:2C 670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD 140 Practice for Sampling Bituminous MaterialsD 244 Test Methods and Practices for Emulsified AsphaltsD 977 Specification for Emulsified AsphaltD 2397 Specification for Cationic E
6、mulsified AsphaltE1 Specification for ASTM Liquid-in-Glass ThermometersE11 Specification for Wire Cloth and Sieves for TestingPurposes3. Terminology3.1 Definition:3.1.1 viscosity, nratio of shear stress to shear rate.3.1.1.1 DiscussionThe SI unit of viscosity is the Pascalsecond (Pas). The centimetr
7、e gram second (cgs) unit ofviscosity is the poise (dynes/cm2) and is equivalent to 0.1 Pas.One centipoise (cP) is one millipascal second (mPas).4. Summary of Test Method4.1 The paddle rotational viscometer for this test method isused to measure the apparent viscosity of emulsified asphalt at50C (122
8、F) between 30 and 1500 mPas (cP). A micropro-cessor circuitry system functioning in tandem with a tempera-ture probe and equipped with internal electronic sensors detectsand analyzes the preset temperature. A paddle is immersed inthe emulsified asphalt sample and is rotated at 100 RPM.3Theapparent v
9、iscosity of the sample is obtained within 5 min andread from the electronic display or optional printer.5. Significance and Use5.1 This test method is useful to measure the apparentviscosity of emulsified asphalt at a temperature of 50C(122F) or another agreed-upon temperature.4The presettemperature
10、 and rotational speed at 100 RPM allow for anautomated determination of an emulsified asphalt apparentviscosity within 5 min.6. Apparatus6.1 The paddle viscometer test system consists of a paddle,temperature probe, sample cup, the sample cup cover, a meansfor controlling the sample temperature to 50
11、 6 0.1C (122 60.18F), and readout system to display viscosity. The dimen-sions of the sample cup and paddle are shown in Figs. 1-3.6.2 ThermometerASTM No. 19F or 19C for tests at 50Cconforming to the requirements of Specification E1.6.3 SieveAn 850-m sieve or a 20-mesh strainer of wirecloth, framed
12、or unframed, conforming to Specification E11isused.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 Jan. 1, 2006. Published January 2006.2For refere
13、nced 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.3Emulsions are sensitive to RPM, therefore, the manufacturer has preset
14、theinstrument to run at 100 RPM.4No accurate predictable conversion from mPa seconds to Saybolt FurolSeconds (SFS) is available at this time. However, an empirical correlation betweenSFS and mPa seconds can be obtained by performing the respective viscositymeasurements on the appropriate equipment.1
15、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.FIG. 1 Paddle Dimensions, mm (in.)FIG. 2 Sample Cup Dimensions, mm (in.)D72260626.4 Oven/Water BathAn oven/water bath capable ofmaintaining the required testing temperature within the li
16、mitspecified in 3.1 of Test Method D 244 is used.7. Procedure7.1 Obtain a representative sample of the material fortesting using standard procedures as specified in PracticeD 140.7.2 Turn on the viscometer power, set to 50C (122F), andattach the paddle to the viscometer.7.3 Preheat the emulsified as
17、phalt sample to 50 6 3C (1226 5F) in a 50 6 3C (122 6 5F) water bath or oven. Stir thesample so as not to incorporate bubbles.7.4 Pour the sample into a clean sample cup through the850-m sieve or 20-mesh strainer to the fill line of theviscometer sample cup.7.5 Pull the heater block forward and clea
18、r of the paddle.Place the filled sample cup into the heater block and rotate thecup to lock it in place. Push the heater block back until it stopsbeneath the paddle.7.6 Raise the heater block to submerge the paddle into thesample. Verify that the paddle and temperature probe aretotally submerged in
19、the sample. The paddle should be free torotate. Place the sample cover over the ample cup.7.7 Verify that the target temperature is set at 50C (122F)and follow the instrument instruction to run the test. Therotational speed is preset by the manufacturer to 100 RPM.7.8 After the test is completed, re
20、cord the viscosity readingfrom the viscometer.8. Report8.1 Report the apparent viscosity in mPas to the nearest 0.1mPas from the viscometer.8.2 Report the temperature to the nearest 0.1C (0.18F).9. Precision and Bias9.1 The following criteria should be used for judging theacceptability of results (9
21、5 % probability):9.1.1 Single-Operator PrecisionDuplicate results by thesame operator should not be considered suspect unless theydiffer by the precision criteria given in Table 1.9.1.2 Multilaboratory PrecisionReproducibility for thistest method has not been determined yet but will be determinedFIG
22、. 3 Paddle and Sample Cup, mm (in.)TABLE 1 Single-Operator Precision for Emulsified AsphaltsTested at 50C (122F)NOTEThe numbers represent, respectively, the (1s %) and (d2s %)limits as described in Practice C 670.Material IndexCoefficientof Variation(% of Mean)Acceptable Rangeof Two Results(% of Mea
23、n)Single-operator precision:Emulsified asphaltat 50C (122F)2.45 6.87D7226063within five years, therefore, this test method should not be usedfor acceptance or rejection of a material for purchasingpurposes.9.2 BiasNo information can be presented on the basis ofthe procedure because no material havin
24、g the accepted refer-ence value is available.10. Keywords10.1 emulsified asphalt; paddle viscometer; rotational;viscosityAPPENDIX(Nonmandatory Information)X1. EMULSION SUMMARY PRECISION DATAEmulsion CRS-2P CRS-2P CRS-2 HFRS-2 CMS-2s Run 1 523 537.1 869.30 798.90 377.00Run 2 517 551.4 886.40 746.10 3
25、80.70Run 3 500 891.90 392.60Average 513.33 544.25 882.53 772.50 383.43Stdev 11.93 10.11 11.79 37.34 8.15CV 2.32% 1.86% 1.34% 4.83% 2.13% 2.50%Emulsion CSS-1h CRS-1h HFRS-1P HFRS-1 CRS-1Run 1 294.40 1060.00 1003.40 945.90 321.70Run 2 289.00 1105.20 980.30 1023.00 309.40Run 3 292.30 1071.50 950.30 996
26、.50 321.00Average 291.90 1078.90 978.00 988.47 317.37Stdev 2.72 23.49 26.62 39.17 6.91CV 0.93% 2.18% 2.72% 3.96% 2.18% 2.39%Emulsion CSS-1 SS-1 RS-1Run 1 54.09 82.80 36.66Run 2 55.34 80.90 38.71Run 3 56.58 80.90Average 55.34 81.53 37.69Stdev 1.25 1.10 1.45CV 2.25% 1.35% 3.85% 2.48%Single d1s% d2s%Op
27、erator 2.45% 6.87%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 o
28、f 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
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30、o 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).D7226064
