ASTM D6998-19

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: D6998 −19
Standard Practice for
1
Evaluating Aggregate Coating using Emulsified Asphalts
This standard is issued under the fixed designation D6998; 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 3.2 All emulsified asphalts with viscosity testing require-
ments of 50 °C shall be conditioned to 50 6 3 °C in a sample
1.1 This practice covers those emulsified asphalts intended
container in a water bath or oven. The container should be
for use by mixing with aggregate. It is not applicable to
vented to relieve pressure.After the sample reaches 50 6 3 °C,
rapid-setting types or diluted materials used for tack coats,
stir the sample to achieve homogeneity.
priming, or mulch treatments.
3.3 Emulsified asphalts with viscosity testing requirements
1.2 The values stated in SI units are to be regarded as
of 25 °C shall be conditioned to 25 6 3 °C in a sample
standard. No other units of measurement are included in this
container to achieve homogeneity.After the sample reaches 25
standard.
6 3 °C, stir the sample to achieve homogeneity.
1.3 The text of this standard references notes and footnotes
NOTE 1—Emulsified asphalts with viscosity testing requirements of
which provide explanatory material. These notes and footnotes
25 °C may be heated and stirred as specified in 3.2, if necessary. In the
(excluding those in tables and figures) shall not be considered
event the 3.2 method is used, the sample should be cooled to 25 6 3 °C.
as requirements of the standard.
1.4 This standard does not purport to address all of the 4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 The intent of this practice is to ensure that a given
responsibility of the user of this standard to establish appro-
mixing grade emulsified asphalt is stable enough and otherwise
priate safety, health, and environmental practices and deter-
possesses the ability to mix with a reference stone for the
mine the applicability of regulatory limitations prior to use.
prescribed time, and coat it uniformly and thoroughly.
1.5 This international standard was developed in accor-
NOTE 2—The quality of the results produced by this standard are
dance with internationally recognized principles on standard-
dependent on the competence of the personnel performing the procedure
ization established in the Decision on Principles for the
and the capability, calibration, and maintenance of the equipment used.
Development of International Standards, Guides and Recom-
Agencies that meet the criteria of Specification D3666 are generally
mendations issued by the World Trade Organization Technical
considered capable of competent and objective testing, sampling,
Barriers to Trade (TBT) Committee. inspection, etc. Users of this standard are cautioned that compliance with
Specification D3666 alone does not completely ensure reliable results.
2. Referenced Documents Reliable results depend on many factors; following the suggestions of
Specification D3666 or some similar acceptable guideline provides a
2
2.1 ASTM Standards:
means of evaluating and controlling some of those factors.
D3666 Specification for Minimum Requirements for Agen-
cies Testing and Inspecting Road and Paving Materials
5. Apparatus and Material
E11 Specification for Woven Wire Test Sieve Cloth and Test
5.1 Sieves—Standard 19.0-mm and 6.3-mm sieves conform-
Sieves
ing to Specification E11.
3. Sample Conditioning for Testing
5.2 Spatula—A steel spatula or its equivalent, having a
3.1 All emulsified asphalts shall be properly stirred to blade approximately 200 mm in length.
achieve homogeneity.
5.3 Mixing Container—A container of approximately 1-L
capacity (for example, round-bottom iron dish, kitchen
1
This practice is under the jurisdiction of ASTM Committee D04 on Road and
saucepan, pie tin, stainless steel bowl).
Paving Materials and is the direct responsibility of Subcommittee D04.42 on
Emulsified Asphalt Test.
5.4 Stone—Asupplyofreferencestone(hardlimestone,trap
Current edition approved Dec. 1, 2019. Published January 2020. Originally
rock, or other type) which has been washed with water and
approved in 2004. Last previous edition approved in 2011 as D6998 – 11. DOI:
dried before using. All stone shall pass through the standard
10.1520/D6998-19.
2
19.0-mm sieve and not more than 5 % shall pass through the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at
...