ASTM D6805-02

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Designation:D6805–02
Standard Practice for
Infrared (IR) Procedure for Determination of Aromatic/
Aliphatic Ratio of Bituminous Emulsions
This standard is issued under the fixed designation D 6805; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope region of the electromagnetic spectrum includes wavelengths
from 0.70 µm to approximately 300 µm, that is, longer than
1.1 This practice uses infrared analytical techniques to
visible light and shorter than microwave.
qualitatively determine in the laboratory a ratio of aromatic
Hawley’s Condensed Chemical Dictionary
absorbance to aliphatic absorbance. This practice may be used
to determine if the bitumen in the emulsion is predominantly
4. Summary of Practice
aromatic or aliphatic in nature.
4.1 Asample of bituminous emulsion from which the water
1.2 This standard does not purport to address all of the
has been removed using Na SO is dissolved in carbon
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safety concerns, if any, associated with its use. It is the
disulfide (CS ), and the infrared (IR) absorbance from 2.5 to
responsibility of the user of this standard to establish appro-
4.2 µm is determined. The absorbance at 3.27 µm (aromatic) is
priate safety and health practices and determine the applica-
divided by the absorbance at 3.40 µm (aliphatic) to obtain the
bility of regulatory limitations prior to use.
IR ratio.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
5.1 The results of this practice may be used to distinguish
D 2939 Test Methods for Emulsified Bitumens Used as
2 tar-based emulsion from an asphalt-based emulsion for speci-
Protective Coatings
fication compliance purposes.
3. Terminology
6. Apparatus
3.1 Definitions:
6.1 Infrared Spectrophotometer.
3.1.1 aliphatic—a group of organic compounds character-
6.2 Sealed Sodium Chloride (NaCl) IR Cell, with 0.1 to 1
ized by straight- or branched-chain arrangements of the con-
mm path length.
stituent carbon atoms. Examples of aliphatic compounds in-
6.3 IR Cell Cleaner.
clude paraffins (alkanes), olefins (alkenes), and acetylenes
6.4 Vacuum Pump and Dry-Ice Trap, to protect pump.
(alkynes). These compounds are primarily found in petroleum
3 6.5 Syringe, glass, 10 mL.
sources. Hawley’s Condensed Chemical Dictionary
6.6 Mechanical Shaker.
3.1.2 aromatic—a group of organic compounds made up of
6.7 Sieves, No. 40 (425 µm opening) and No. 100 (150 µm).
unsaturated cyclic hydrocarbons containing one or more rings,
6.8 Balance, capable of weighing to 0.001 g.
an example of which is benzene. Large numbers of these
6.9 Pipet, 10 mL and rubber bulb.
compounds are derived from petroleum and coal tar, and are
classified as “aromatics” because of their strong and not
7. Reagents and Materials
unpleasant odor characteristics.
3 7.1 Disposable “Medicine” Dropper.
Hawley’s Condensed Chemical Dictionary
7.2 Vial, 20 mL, with cork-backed metal foil liner.
3.1.3 infrared absorbance—the range of wavelengths in the
7.3 Filter Paper, rapid flow rate, 12.5 cm.
infrared that are absorbed by a specimen and identify its
7.4 Glass Funnel, for above filter paper.
molecular components and compound structures. The infrared
7.5 Carbon Disulfide (CS ), spectroscopy grade.
7.6 Sodium Sulfate (Na SO ), anhydrous.
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This practice is under the jurisdiction of ASTM Committee D08 on Roofing,
8. Hazards
Waterproofing, and Bituminous Materials and is the direct responsibility of
Subcommittee D08.09 on Bituminous Emulsions.
8.1 Carbon disulfide (CS ) is a hazardous material and must
Current edition approved June 10, 2002. Published July 2002.
2 behandledproperly.BeforeusingCS ,readandunderstandthe
Annual Book of ASTM Standards, Vol 04.04. 2
Lewis, Richard J., Sr., Hawley’s Condensed Chemical Dictionary, Thirteenth CS Material Safety Data Sheet and the label on the CS bottle.
2 2
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
Use appropriate precautions, including safety equipment, when 13.1.5 Record the following information on the chart paper:
handling CS . Be sure to work in a properly operating hood 13.1.5.1 Sample number,
and wear appropriate gloves.
13.1.5.2 Sample identification,
13.1.5.3 Date of analysis,
9. Sampling, Test Specimens, and Preparation
13.1.5.4 Analyst’s name,
9.1 Every effort should be taken to ensure that a represen-
13.1.5.5 Cell used (NaCl), and
tative sample is taken. Follow Section 4 from Test Methods
13.1.5.6 Solvent used (CS ).
D 2939 for sampling.
13.1.6 Draw a baseline from 2.7 to 4.0 µm.
10. Dehydration of Sample
14. Calculation of Results
10.1 Dehydration is not necessary since a drying agent
14.1 The determination of absorbance (A) is dependent on
(Na SO ) will be added in a later step.
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the operational mode of the IR instrument and the chart paper
11. Preparation of Working Sample
used. Reco
...