ASTM D6805-02(2023)

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: D6805 − 02 (Reapproved 2023)
Standard Practice for
Infrared (IR) Procedure for Determination of Aromatic/
Aliphatic Ratio of Bituminous Emulsions
This standard is issued under the fixed designation D6805; 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 stituent carbon atoms. Examples of aliphatic compounds in-
clude paraffins (alkanes), olefins (alkenes), and acetylenes
1.1 This practice uses infrared analytical techniques to
(alkynes). These compounds are primarily found in petroleum
qualitatively determine in the laboratory a ratio of aromatic
sources. Hawley’s Condensed Chemical Dictionary
absorbance to aliphatic absorbance. This practice may be used
3.1.2 aromatic—a group of organic compounds made up of
to determine if the bitumen in the emulsion is predominantly
unsaturated cyclic hydrocarbons containing one or more rings,
aromatic or aliphatic in nature.
an example of which is benzene. Large numbers of these
1.2 The values stated in SI units are to be regarded as
compounds are derived from petroleum and coal tar, and are
standard. No other units of measurement are included in this
classified as “aromatics” because of their strong and not
standard.
unpleasant odor characteristics.
1.3 This standard does not purport to address all of the 4
Hawley’s Condensed Chemical Dictionary
safety concerns, if any, associated with its use. It is the
3.1.3 infrared absorbance—the range of wavelengths in the
responsibility of the user of this standard to establish appro-
infrared that are absorbed by a specimen and identify its
priate safety, health, and environmental practices and deter-
molecular components and compound structures. The infrared
mine the applicability of regulatory limitations prior to use.
region of the electromagnetic spectrum includes wavelengths
1.4 This international standard was developed in accor-
from 0.70 µm to approximately 300 µm, that is, longer than
dance with internationally recognized principles on standard-
visible light and shorter than microwave.
ization established in the Decision on Principles for the
Hawley’s Condensed Chemical Dictionary
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Summary of Practice
Barriers to Trade (TBT) Committee.
4.1 Asample of bituminous emulsion from which the water
has been removed using Na SO is dissolved in carbon
2 4
2. Referenced Documents
disulfide (CS ), and the infrared (IR) absorbance from 2.5 to
2.1 ASTM Standards:
4.2 µm is determined. The absorbance at 3.27 µm (aromatic) is
D2939 Test Methods for Emulsified Bitumens Used as
divided by the absorbance at 3.40 µm (aliphatic) to obtain the
Protective Coatings (Withdrawn 2012)
IR ratio.
3. Terminology
5. Significance and Use
3.1 Definitions:
5.1 The results of this practice may be used to distinguish
3.1.1 aliphatic—a group of organic compounds character-
tar-based emulsion from an asphalt-based emulsion for speci-
ized by straight- or branched-chain arrangements of the con-
fication compliance purposes.
6. Apparatus
ThispracticeisunderthejurisdictionofASTMCommitteeD08onRoofingand
6.1 Infrared Spectrophotometer.
Waterproofing and is the direct responsibility of Subcommittee D08.09 on Liquid
Applied Coatings for Roofing and Asphaltic Concrete Pavement.
6.2 Sealed Sodium Chloride (NaCl) IR Cell, with 0.1 to
Current edition approved Jan. 1, 2023. Published January 2023. Originally
1 mm path length.
approved in 2002. Last previous edition approved in 2016 as D6805 – 02 (2016).
DOI: 10.1520/D6805-02R23.
6.3 IR Cell Cleaner.
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 6.4 Vacuum Pump and Dry-Ice Trap, to protect pump.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
The last approved version of this historical standard is referenced on Lewis, R. J., Sr., Hawley’s Condensed Chemical Dictionary, Thirteenth
www.astm.org. Edition, New York, Van Nostrand Reinhold, 1997.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6805 − 02 (2023)
6.5 Syringe, glass, 10 mL. 13.1.1 Determine spectrum within1hof extraction with
CS .
6.6 Mechanical Shaker.
13.1.2 Fill the IR reference cell, using a dropper or syringe,
6.7 Sieves, No. 40 (425 µm opening) and No. 100 (150 µm).
with the CS solvent.
6.8 Balance, capable of weighing to 0.001 g. 13.1.3 Fill the IR sample cell, using a dropper or syringe,
with the CS /bituminous emulsion filtered solution.
6.9 Pipet, 10 mL and rubber bulb.
NOTE 2—Follow the filling directions supplied by the cell(s) manufac-
7. Reagents and Materials
turer.
7.1 Disposable “Medicine” Dropper.
13.1.4 Referring to the instructions supplied with the par-
ticular IR instrument being used, determine the IR spectrum
7.2 Vial, 20 mL, with cork-backed metal foil liner.
from 2.5 to 4.2 µm in the Absorbance mode. Linearly ruled
7.3 Filter Paper, rapid flow rate, 12.5 cm.
chart paper is used in the absorbance mode; however, if the
7.4 Glass Funnel, for above filter paper.
instrument can only be operated in the Transmittance mode,
use logarithmically ruled chart paper (if log paper is not
7.5 Carbon Disulfide (CS ), spectroscopy grade.
available, follow Transmittance mo
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