ASTM D6608-00

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Designation: D 6608 – 00
Standard Practice for
the Identification of Trinidad Lake Asphalt in Asphalt Mixes
This standard is issued under the fixed designation D 6608; 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 tures above 230°C (446°F). Trinidad Lake Modified Asphalt
contains sulfur compounds, which are released at lower tem-
1.1 This practice shall be used for the qualitative determi-
peratures between 170°C (338°F) and 230°C (446°F). The
nation of Trinidad Lake Asphalt in Trinidad Lake Modified
release of sulfur from Trinidad Lake Modified Asphalt tar-
Asphalt Cements obtained from production blends or recov-
nishes the copper strip and appears to be related directly to the
ered binder from asphalt paving mixtures.
total TLA content. The copper strip test is designed to assess
1.2 It is limited to the binder content of Trinidad Lake
the qualitative presence of TLA in asphalt cements.
Modified Asphalt (Specification D 5710) used in the construc-
tion of asphalt pavements.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Test Tubes, 25 by 150 mm.
safety concerns, if any, associated with its use. It is the
5.2 Provide a bath, which can maintain a constant tempera-
responsibility of the user of this standard to establish appro-
ture of 210 6 1°C (410 6 2°F) and 225 6 1°C (437 6 2°F).
priate safety and health practices and determine the applica-
The bath should have suitable supports to hold the test tubes in
bility of regulatory limitations prior to use.
a vertical position and immersed to a depth of about 100–mm
2. Referenced Documents (4–in.). Oil or aluminum block baths are suitable.
5.3 Thermometer, partial immersion for indicating the re-
2.1 ASTM Standards:
quiredtesttemperature,withgraduations1°C(2°F)orless.The
D 140 Practice for Sampling Bituminous Materials
ASTM 2C (2F) thermometer is suitable.
D 1856 Test Method for Recovery ofAsphalt from Solution
5.4 Polishing Vise, to hold the copper strip firmly without
by the Abson Method
marring the edge while polishing. Any suitable holder may be
D 2172 Test Methods for Quantitative Extraction of Bitu-
used provided that the surface is held tightly and the surface
men from Bituminous Paving Mixtures
2 being polished is supported above the surface of the holder.
D 5710 Specification for Trinidad Lake Modified Asphalt
5.5 Viewing Test Tubes, flat glass test tubes, are convenient
E 1 Specification for ASTM Thermometers
for protecting corroded strip and may be used for close
3. Summary of Test Method
inspection and storage.
3.1 Apolished copper strip is immersed in a given quantity
6. Materials
of sample and heated at a temperature and for a given time
6.1 Wash Solvent—Any volatile, sulfur free hydrocarbon
characteristic of the material being tested. At the end of this
solvent may be used that would show no tarnish when tested at
periodthecopperstripisremoved,washed,andcomparedwith
210°C or 225°C.
the classifications of the TLA Copper Tarnishing Ranges for
copper strips.
NOTE 1—Toluene is a suitable solvent.
6.2 Polishing Materials:
4. Significance and Use
6.2.1 Silicone carbide grip paper of varying degrees of
4.1 Bitumen contains sulfur compounds most of which are
fineness including 65 µm (240 grit) paper or cloth.
removed during refining, the resulting asphalt cement also
6.2.2 Silicone carbide grains 105 µm (150–mesh).
contains sulfur compounds which are released at the tempera-
6.2.3 Absorbent cotton (cotton wool), pharmaceutical
grade.
6.3 Copper Strips:
This practice is under the jurisdiction of ASTM Committee D04 on Road and
Paving Materials and is the direct responsibility of Subcommittee D04.47 on
6.3.1 Specifications—Use strips 12.5 mm ( ⁄2 in.) wide, 1.5
Miscellaneous Asphalt Tests. 1 1
to 3.0 mm ( ⁄16 to ⁄8 in.) thick, cut 75 mm (3 in.) long from
Current edition approved Dec. 10, 2000. Published February 2001.
smooth-surface, hard temper, cold-finished copper of 99.9+ %
Annual Book of ASTM Standards, Vol 04.03.
purity; electrical bus bar stock is generally suitable (seeAnnex
Annual Book of ASTM Standards, Vol 14.03.
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D6608–00
A1).Thestripsmaybeusedrepeatedlybutshouldbediscarded untilmolten.Stirthesamplethoroughlyagainbeforedecanting
when the surfaces become deformed on handling. into the sample test tubes.
6.3.2 Surface Preparation—Remove all surface blemishes
8. Procedure
from all six sides of the strip with silicone carbide paper of
such varying degrees of fineness as are needed to accomplish 8.1 Place 15–20 mLof the molten recovered binder sample,
which is free of any entrained water or suspended water, into
the desired results efficiently. Finish with 65–µm (240 grit)
silicone carbide paper or cloth, removing all marks that may each of two clean and dry test tubes. Insert a polished copper
stripintoeachtesttubewithinone(1)minuteofcompletingthe
have been made by other grades of paper used previously.
Immerse the strip in wash solvent from which it can be final strip preparation. Ensure that the strip is vertically held in
3 1
thesamplewithapproximately44–57mm(1 ⁄4–2 ⁄4in.)ofthe
withdrawn immediately for final preparation (polishing) or in
strip projecting out of the sample mixture.
which it can be stored for future use.
8.2 Place the test tubes in the bath, which has been
6.3.2.1 As a practical manual procedure for the surface
maintained at 210°C and leave for 25 min.
preparation, place a sheet of paper on a flat surface, moisten it
8.3 Strip Examination:
with kerosene or wash solvent, and rub the strip against the
8.3.1 Empty the contents of each test tube into a 150–mL
paper
...