1、Standard Method of Test for Determining the Viscosity of Emulsified Asphalt by a Rotational Paddle Viscometer AASHTO Designation: TP 121-161Release: Group 3 (August 2016) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 2000
2、1 TS-2a TP 121-1 AASHTO Standard Method of Test for Determining the Viscosity of Emulsified Asphalt by a Rotational Paddle Viscometer AASHTO Designation: TP 121-161Release: Group 3 (August 2016) 1. SCOPE 1.1. This test method utilizes a rotational paddle viscometer to measure the viscosity of emulsi
3、fiedasphalt. It is applicable to all the emulsified asphalts described in M 140, M 208, and M 316 andwith temperatures between 25C and less than 90C (77F and less than 194F). Note 1The viscometer makes measurements at 25C (77F), 40C (104F), 50C (122F), 80C (176F), and 90C (194F) without any external
4、 ancillary equipment and with a temperature probe directly in the liquid sample. The viscosity measurement range is from 30 mPas to 3000 mPas (30 to 3000 cP). 1.2. The values stated in SI units are to be regarded as the standard. The values given in parentheses are for informational purposes only. 1
5、.3. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED
6、DOCUMENTS 2.1. AASHTO Standards: M 140, Emulsified Asphalts M 208, Cationic Emulsified Asphalts M 316, Polymer-Modified Emulsified Asphalts R 66, Sampling Asphalt Materials 2.2. ASTM Standards: D7226, Standard Test Method for Determining the Viscosity of Emulsified Asphalts Using a Rotational Paddle
7、 Viscometer E1, Standard Specifications for ASTM Liquid-in-Glass Thermometers E11, Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves 3. TERMINOLOGY 3.1. Definition: 3.1.1. viscositya ratio of shear stress to shear rate, 2016 by the American Association of State Highway and Trans
8、portation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a TP 121-2 AASHTO 4.4.1. 4.2. 4.3. SUMMARY OF TEST METHODThe viscometer is used to measure the apparent viscosity of emulsified asphalt at 25C (77F), 50C (122F), or other agreed-upon temperatures.A microprocess
9、or circuitry system functioning in tandem with a temperature probe inserted directly in the sample and equipped with internal electronic sensors detects and analyzes the preset temperature. The system shall control the preset temperature to 0.1C (0.5F) of the preset temperature.A paddle is immersed
10、in the emulsified asphalt sample and is rotated at 100 rpm. The apparent viscosity of the sample is obtained and read from the electronic display or printer.5. SIGNIFICANCE AND USE5.1. This test method is useful to characterize the viscosity of emulsified asphalt products, as anelement to establish
11、uniformity of shipments and sources of supply.5.2. The viscosity of emulsified asphalts characterizes their flow properties and affects their utility at50C (122F) or at other temperatures. For many applications, the sprayability and workability ofemulsified asphalt are directly related to the viscos
12、ity. The material must have a viscosity lowenough to be sprayed yet high enough to not flow from the crown or grade of the road.5.3. For mixing-grade emulsified asphalts, the viscosity will affect its workability and resulting filmthickness on the aggregate.5.4. This test method is useful to measure
13、 the apparent viscosity of emulsified asphalt at a temperatureof 25C (77F), 50C (122F), or another agreed-upon temperature. The preset temperature androtational speed at 100 rpm allow for an automated and consistent determination of an emulsifiedasphalt viscosity within a short time.6. APPARATUSNote
14、 2All dimensions are in millimeters (inches).6.1. The rotational paddle viscometer test system consists of a paddle, temperature probe, sample cup,the sample cup cover, a means of controlling the sample temperature to within 0.1C (0.5F), anda readout system to display viscosity.6.2. The parts of the
15、 viscometer are shown in Figures 1, 2, and 3. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a TP 121-3 AASHTO Figure 1Paddle Dimensions Figure 2Sample Cup Dimensions 2016 by the American Associatio
16、n of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a TP 121-4 AASHTO Figure 3Paddle and Sample Cup with Temperature Probe 6.3. Thermometerany thermometric device with accuracy of 1C (2F) can be used to monitor the temperature of the
17、sample being conditioned for testing. 6.4. Sievean 850-m (No. 20) sieve or a 20-mesh strainer of wire cloth, framed or unframed, conforming to ASTM E11. 6.5. Oven/Water Bathan oven/water bath capable of maintaining the required testing temperature within the limit of 3C (5F). 7. PROCEDURE 7.1. Obtai
18、n a representative sample of the material for testing using standard procedures as specified in R 66. 7.2. Turn on the viscometer power; set it to the test temperature, and attach the paddle to the viscometer. Allow the instrument to warm up for a minimum of 30 min. 7.3. Emulsified asphalts with a v
19、iscosity testing requirement of 50C (122F) shall be heated to 50 3C (122 5F) in the original sample container in a water bath or oven. If the sample temperature is greater or less than 50C (122F) it should be conditioned to the required test temperature. 7.4. Pour the sample into a clean sample cup
20、through the 850-m (No. 20) or 20-mesh strainer to the fill line of the viscometer sample cup. 7.5. Emulsified asphalts with a viscosity testing temperature requirement of 25C (77F) should be conditioned at 25 3C (77 5F) in the original sample container to achieve homogeneity. 7.6. Pour the sample in
21、to the sample cup after passing through an 850-m (No. 20) or 20-mesh sieve. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a TP 121-5 AASHTO 7.7. Place the filled sample cup into the heater block, a
22、nd rotate the cup to lock it in place. 7.8. Submerge the paddle into the sample. Verify that the paddle and temperature probe are totally submerged in the sample. 7.9. Ensure the paddle is free to rotate. Place the sample cover over the sample cup. 7.10. Verify that the temperature of the sample is
23、a few degrees lower than the target temperature before beginning the automatic test sequence; then enter “Run Test.” The rotational speed is preset by the manufacturer to 100 rpm. 7.11. After the test is completed, record the viscosity reading from the viscometer, and if appropriate, apply the corre
24、ction factor as described in Section 9. 8. SAMPLING 8.1. Sample the material in accordance with R 66. 9. CALIBRATION AND STANDARDIZATION 9.1. Calibrate the viscometer at intervals of not greater than one year or as otherwise required by measuring the viscosity at 25C (77F) of an appropriate standard
25、 following the procedure in Section 7. See Annex A for the recommended certified viscosity standard. 9.2. If the specific viscometer does not allow a digital calibration, the user shall manually calculate a correction factor, F, as follows: sF=(1) where: s= certified viscosity of the standard at the
26、 test temperature, and = measured viscosity at 25C (77F). 9.3. If the specific viscometer permits the user to digitally calibrate the viscosity, follow the instructions provided by the manufacturer. 9.4. Calibrate the viscometer in the same manner as above, using a viscosity standard for 50C (122F).
27、 See Annex A1 for the recommended certified viscosity standard. 10. REPORT 10.1. Report the corrected viscosity where appropriate by using the correction factor, F, determined in Section 9.2. 10.2. Report the apparent viscosity in mPas of the sample at the temperature at which the test was performed
28、. 10.3. Report the temperature to the nearest 0.1C and the viscosity to the nearest 0.1 mPas. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a TP 121-6 AASHTO 11. PRECISION AND BIAS11.1. The followi
29、ng criteria should be used for judging the acceptability of results (95 percentprobability)2:11.1.1. Single-Operator PrecisionDuplicate results by the same operator should not be consideredsuspect unless they differ by more than the following amount:Test Temperature C (F) Viscosity mPas Repeatabilit
30、y % of the mean 25 (77) 25 to 200 8.2 50 (122) 100 to 1000 12.9 11.1.2. Multilaboratory PrecisionThe results submitted by each of two laboratories should not be considered suspect unless they differ by more than the following amount: Test Temperature C (F) Viscosity mPas Reproducibility % of the mea
31、n 25 (77) 25 to 200 22 50 (122) 100 to 1000 64 11.2. BiasNo information can be presented on the bias of the procedure because no material having the accepted reference value is available. 12. KEYWORDS12.1. Emulsified asphalt; rotational; rotational paddle viscometer; viscosity.13.13.1. 13.2. REFEREN
32、CESAASHTO Standard: T 59, Emulsified AsphaltsASTM Standards: D977, Standard Specification for Emulsified Asphalt D2397/D2397M-13, Standard Specification for Cationic Emulsified Asphalt 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is
33、a violation of applicable law.TS-2a TP 121-7 AASHTO ANNEX AVISCOSITY STANDARDS (Mandatory Information) A1. STANDARDS3A1.1. Certified Standard S60 with a viscosity of 100 mPas for 25C (77F). A1.2. Certified Standard S600 with a viscosity of 240 mPas for 50C (122F). 1This provisional standard was firs
34、t published in 2016. 2Research Reports RR:D04-1037 and RR:D04-1038 present the results of the Interlaboratory Study used to establish the precision and bias statement for ASTM D7226, Standard Test Method for Determining the Viscosity of Emulsified Asphalt Using a Rotational Paddle Viscometer. The co
35、llaborative study included participation of 14 labs for Research Report RR:D04-1037 and 15 labs for Research Report RR:D04-1038 that used ASTM D7226 to analyze the viscosity of several types of emulsified asphalt of varying viscosity levels, including three different standards. The research reports
36、present a summary method performance statistics as well as the measurement data used to calculate the results for the study. 3Viscosity standards are available from the Cannon Instrument Co., 2139 High Tech Rd, State College, PA 16803. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
