ASTM D7226-13(2023)
(Test Method)Standard Test Method for Determining the Viscosity of Emulsified Asphalts Using a Rotational Paddle Viscometer
Standard Test Method for Determining the Viscosity of Emulsified Asphalts Using a Rotational Paddle Viscometer
SIGNIFICANCE AND USE
5.1 The viscosity of emulsified asphalts characterizes their flow properties and affects their utility at 50 °C or at other temperatures. The sprayability and workability of an emulsified asphalt are directly related to its viscosity for many applications. The material must be thin enough to be sprayed yet thick enough such that it will not flow from the crown or grade of the road. For mixing-grade emulsified asphalts, the viscosity will affect its workability and resulting film thickness on the aggregate. This test method is useful to measure the apparent viscosity of emulsified asphalt at a temperature of 50 °C, 25 °C, or another agreed-upon temperature. The preset temperature and rotational speed at 100 r/min allow for an automated and consistent determination of an emulsified asphalt viscosity within a short time.
SCOPE
1.1 This test method utilizes the rotational paddle viscometer to measure the viscosity of emulsified asphalt. It is applicable to all the emulsified asphalts described in Specifications D977 and D2397/D2397M.
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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7226 − 13 (Reapproved 2023)
Standard Test Method for
Determining the Viscosity of Emulsified Asphalts Using a
Rotational Paddle Viscometer
This standard is issued under the fixed designation D7226; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1.1 Discussion—The SI unit of viscosity is the Pascal
second (Pa·s).
1.1 This test method utilizes the rotational paddle viscom-
eter to measure the viscosity of emulsified asphalt. It is
4. Summary of Test Method
applicable to all the emulsified asphalts described in Specifi-
4.1 The rotational paddle viscometer method is used to
cations D977 and D2397/D2397M.
measure the apparent viscosity of emulsified asphalt at 50 °C,
1.2 The values stated in SI units are to be regarded as
25 °C, or other agreed-upon temperatures. A microprocessor
standard. No other units of measurement are included in this
circuitry system functioning in tandem with a temperature
standard.
probe and equipped with internal electronic sensors detects and
analyzes the preset temperature. A paddle is immersed in the
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the emulsified asphalt sample and is rotated at 100 r/min. The
apparent viscosity of the sample is obtained and read from the
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- electronic display or an optional printer.
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 This international standard was developed in accor-
5.1 The viscosity of emulsified asphalts characterizes their
dance with internationally recognized principles on standard-
flow properties and affects their utility at 50 °C or at other
ization established in the Decision on Principles for the
temperatures. The sprayability and workability of an emulsi-
Development of International Standards, Guides and Recom-
fied asphalt are directly related to its viscosity for many
mendations issued by the World Trade Organization Technical
applications. The material must be thin enough to be sprayed
Barriers to Trade (TBT) Committee.
yet thick enough such that it will not flow from the crown or
2. Referenced Documents
grade of the road. For mixing-grade emulsified asphalts, the
viscosity will affect its workability and resulting film thickness
2.1 ASTM Standards:
on the aggregate. This test method is useful to measure the
D140/D140M Practice for Sampling Asphalt Materials
apparent viscosity of emulsified asphalt at a temperature of
D977 Specification for Emulsified Asphalt
50 °C, 25 °C, or another agreed-upon temperature. The preset
D2397/D2397M Specification for Cationic Emulsified As-
temperature and rotational speed at 100 r/min allow for an
phalt
automated and consistent determination of an emulsified as-
E11 Specification for Woven Wire Test Sieve Cloth and Test
phalt viscosity within a short time.
Sieves
6. Apparatus
3. Terminology
6.1 The rotational paddle viscometer test system consists of
3.1 Definitions:
a paddle, temperature probe, sample cup, the sample cup cover,
3.1.1 viscosity, n—ratio of shear stress to shear rate.
a means of controlling the sample temperature to within
60.1 °C, and a readout system to display viscosity. The
dimensions of the sample cup and paddle are shown in Figs.
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.42 on
1-3.
Emulsified Asphalt Test.
6.2 Thermometer—Any thermometric device can be used to
Current edition approved March 1, 2023. Published March 2023. Originally
approved in 2006. Last previous edition approved in 2017 as D7226 – 13 (2017).
monitor the temperature of the sample being conditioned for
DOI: 10.1520/D7226-13R23.
testing.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on The centimetre gram second (cgs) unit of viscosity is the poise (dynes/cm ) and
the ASTM website. is equivalent to 0.1 Pa·s. One centipoise (cP) is one millipascal second (mPa·s).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7226 − 13 (2023)
FIG. 1 Paddle Dimensions
FIG. 2 Sample Cup Dimensions
D7226 − 13 (2023)
FIG. 3 Paddle and Sample Cup
6.3 Sieve—An 850 μm sieve or a 20 mesh strainer of wire where:
cloth, framed or unframed, conforming to Specification E11 is
η = certified viscosity of the standard at the test
s
used.
temperature, and
η = measured viscosity at 25 °C.
6.4 Oven/Water Bath—An oven/water bath capable of main-
taining the required testing temperature within the limit of
8.3 Calibrate the rotational paddle viscometer in the same
63 °C.
manner as above, using a viscosity standard for 50 °C.
7. Hazards
9. Procedure
7.1 Warning—Mercury has been designated by the EPA
9.1 Obtain a representative sample of the material for
and many state agencies as a hazardous material that can cause
testing using standard procedures as specified in
...
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