ASTM D6084/D6084M-21

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it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: D6084/D6084M − 18 D6084/D6084M − 21
Standard Test Method for
Elastic Recovery of Asphalt Materials by Ductilometer
This standard is issued under the fixed designation D6084/D6084M; 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
1.1 This test method assesses the elastic recovery of an asphalt material measured by the recoverable strain determined after
severing an elongated briquet specimen of the material of the form described in 4.1. The specimens are pulled to a specified
distance at a specified speed and at a specified temperature. Unless otherwise specified, the test shall be made at a temperature of
25 6 0.5 °C [77 6 0.9 °F] and with a speed of 5 cm/min 6 5 %.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.3 Warning—Mercury has been designated by the United States Environmental Protection Agency and many state agencies as
a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous
to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the
applicable Material Safety Data Sheet (MSDS) for details and EPA’s website (http://www.epa.gov/mercury/index.htm) for
additional information. Users should be aware that selling mercury and/or mercury-containing products in your state may be
prohibited by state law.
1.4 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.5 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.
1.6 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.
2. Referenced Documents
2.1 ASTM Standards:
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D5/D5M Test Method for Penetration of Bituminous Materials
This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.44 on Rheological
Tests.
Current edition approved July 1, 2018Nov. 1, 2021. Published July 2018November 2021. Originally approved in 1997. Last previous edition approved in 20132018 as
D6084/D6084M – 13.D6084/D6084M – 18. DOI: 10.1520/D6084_D6084M-18.10.1520/D6084_D6084M-21.
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 ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6084/D6084M − 21
Spacer
A 36.0 ± 0.5 mm
B 30 ± 0.5 mm
C 17 ± 0.25 mm
D 6 ± 0.1 mm
E 10 ± 0.1 mm
FIG. 1 Mold for Elastic Recovery Test Specimen
D113 Test Method for Ductility of Asphalt Materials
D1754/D1754M Test Method for Effects of Heat and Air on Asphaltic Materials (Thin-Film Oven Test)
D2872 Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D6934 Test Method for Residue by Evaporation of Emulsified Asphalt
D6997 Test Method for Distillation of Emulsified Asphalt
D7403 Test Method for Determination of Residue of Emulsified Asphalt by Low Temperature Vacuum Distillation
D7497 Practice for Recovering Residue from Emulsified Asphalt Using Low-Temperature Evaporative Technique
E1 Specification for ASTM Liquid-in-Glass Thermometers
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E77 Test Method for Inspection and Verification of Thermometers
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
E644 Test Methods for Testing Industrial Resistance Thermometers
E1137/E1137M Specification for Industrial Platinum Resistance Thermometers
E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids
3. Significance and Use
3.1 This test method is useful in confirming that a material has been added to the asphalt to provide a significant elastomeric
characteristic. It does not necessarily identify the type or amount of material added.
NOTE 1—The quality of results produced by this standard is dependent on the competence of the personnel performing the procedure and the capability,
calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent
and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely
ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guidance
provides a means of evaluating and controlling some of those factors.
4. Apparatus
4.1 Mold—The mold shall be similar in design to that shown in Fig. 1. The mold shall be made of brass, 10.0 6 0.1 mm thick,
the ends b and b' being known as clips, and the parts a and a' as sides of the mold, with a brass base plate that is larger than the
assembled mold. The dimensions of the assembled mold shall be as shown in Fig. 1, with the permissible variations indicated. (See
Note 2.)
4.2 Water Bath for Conditioning Specimen—Maintain the water bath at the specified test temperature, varying not more than
0.5 °C [0.9 °F] from this temperature. The volume of water shall be not less than 10 L, and the specimen immersed to a depth of
not less than 2.5 cm.
The sole source of supply of the apparatus known to the committee at this time is Humboldt Manufacturing Company, 7300 W. Agatite Ave., Chicago, IL 60656. If you
are aware of alternative suppliers, please provide this information to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible
technical committee, which you may attend.
D6084/D6084M − 21
4.3 Testing Machine—For elongating the briquet of asphalt material, any apparatus may be used that is so constructed that the
specimen will be continuously immersed in water, while the two clips are pulled apart at a uniform speed, as specified, without
undue vibration. A variation of 65 % is permissible. The water in the tank of the testing machine shall cover the specimen both
above and below it by at least 2.5 cm, and shall be maintained within 60.5 °C [0.9 °F] of the test temperature. The testing machine
shall incorporate a means by which the elongation can be measured in centimetres. (See Note 3.)
4.4 Thermometer—A thermometer for monitoring the temperature of the water bath. The thermometer shall be one of the
following:
4.4.1 A liquid-in-glass thermometer of suitable range with subdivisions and maximum scale error of 0.1 °C [0.2 °F] which
conforms to the requirements of Specification E1. The thermometer shall be standardized in accordance with one of the methods
in Test Method E77.
4.4.2 A liquid-in-glass thermometer of suitable range with subdivisions and maximum scale error of 0.1 °C [0.2 °F] which
conforms to the requirements of Specification E2251. The thermometer shall be standardized in accordance with one of the
methods in Test Method E77.
4.4.3 A platinum resistance thermometer (PRT) with a probe which conforms to the requirements of Specification E1137/E1137M.
The PRT shall have a three- or four-wire configuration and the overall sheath length shall be at least 50 mm [2 in.] greater than
the immersion depth. The PRT system (probe and readout) shall be standardized in accordance with Test Methods E644.
Corrections shall be applied to ensure measurements within 0.1 °C [0.2 °F].
4.4.4 A metal-sheathed thermistor with a sensor substantially similar in construction to the PRT probe described in 4.4.3. The
thermistor system (sensor and readout) shall be standardized in accordance with Test Methods E644. Corrections shall be applied
to ensure measurements within 0.1 °C [0.2 °F].
4.5 Scissors—Any type of conventional scissors capable of cutting the bituminous material at the test temperature.
4.6 Oven—An oven capable of maintaining 135 6 5 °C [275 6 10 °F].
4.7 Sieves—300-μm [No. 50] and 850-μm [No. 20] sieves, 75 mm [3 in.] in diameter, in accordance with Specification E11.
4.8 Release Agent—A mixture such as glycerin with Dextrin, talc, or Kaolin (china clay), or 1 g Versamid Resin per 100 g castor
oil (not generic mineral oil), used to coat the bottom and sides of the mold to prevent the specimen from sticking to the mold. Other
materials may be used for this purpose if they have been shown not to affect the physical properties of the test specimen.
4.9 Trimming Tool—A straight-edged putty knife or spatula.
NOTE 2—Clips for the mold are the same as specified in Fig. 1 of Test Method D113.
NOTE 3—The testing machine may be the same as specified in Test Method D113.
NOTE 4—In those cases where the elastic recovery specimens are conditioned in the standard penetration bath at 25 °C [77 °F], the thermometer as
prescribed for Test Method D5/D5M may be used.
5. Sample Preparation
5.1 Emulsified Asphalt Residue—If the sample is a residual product recovered from emulsified asphalt by means of the methods
described in Test Methods D6934, D6997, D7403, or Practice D7497, stir the heated residue and immediately pour portions of the
residue into suitable molds for making the required tests. If it is suspected that there is foreign matter in the residue, pour the
material through a 300-μm [No. 50] sieve that has been preheated at
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