ASTM D6608-00(2006)
(Practice)Standard Practice for the Identification of Trinidad Lake Asphalt in Asphalt Mixes
Standard Practice for the Identification of Trinidad Lake Asphalt in Asphalt Mixes
SIGNIFICANCE AND USE
Bitumen contains sulfur compounds most of which are removed during refining, the resulting asphalt cement also contains sulfur compounds which are released at the temperatures above 230°C (446°F). Trinidad Lake Modified Asphalt contains sulfur compounds, which are released at lower temperatures between 170°C (338°F) and 230°C (446°F). The release of sulfur from Trinidad Lake Modified Asphalt tarnishes the copper strip and appears to be related directly to the total TLA content. The copper strip test is designed to assess the qualitative presence of TLA in asphalt cements.
SCOPE
1.1 This practice shall be used for the qualitative determination of Trinidad Lake Asphalt in Trinidad Lake Modified Asphalt Cements obtained from production blends or recovered binder from asphalt paving mixtures.
1.2 It is limited to the binder content of Trinidad Lake Modified Asphalt (Specification D 5710) used in the construction of asphalt pavements.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6608 −00(Reapproved 2006)
Standard Practice for
the Identification of Trinidad Lake Asphalt in Asphalt Mixes
This standard is issued under the fixed designation D6608; 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 contains sulfur compounds which are released at the tempera-
tures above 230°C (446°F). Trinidad Lake Modified Asphalt
1.1 This practice shall be used for the qualitative determi-
contains sulfur compounds, which are released at lower tem-
nation of Trinidad Lake Asphalt in Trinidad Lake Modified
peratures between 170°C (338°F) and 230°C (446°F). The
Asphalt Cements obtained from production blends or recov-
release of sulfur from Trinidad Lake Modified Asphalt tar-
ered binder from asphalt paving mixtures.
nishes the copper strip and appears to be related directly to the
1.2 It is limited to the binder content of Trinidad Lake
total TLA content. The copper strip test is designed to assess
Modified Asphalt (Specification D5710) used in the construc-
the qualitative presence of TLA in asphalt cements.
tion of asphalt pavements.
5. Apparatus
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.1 Test Tubes, 25 by 150 mm.
responsibility of the user of this standard to establish appro-
5.2 Provide a bath, which can maintain a constant tempera-
priate safety and health practices and determine the applica-
ture of 210 6 1°C (410 6 2°F) and 225 6 1°C (437 6 2°F).
bility of regulatory limitations prior to use.
The bath should have suitable supports to hold the test tubes in
a vertical position and immersed to a depth of about 100-mm
2. Referenced Documents
(4-in.). Oil or aluminum block baths are suitable.
2.1 ASTM Standards:
D140 Practice for Sampling Bituminous Materials 5.3 Thermometer, partial immersion for indicating the re-
D1856 Test Method for Recovery of Asphalt From Solution quiredtesttemperature,withgraduations1°C(2°F)orless.The
by Abson Method ASTM 2C (2F) thermometer is suitable.
D2172 Test Methods for Quantitative Extraction of Bitumen
5.4 Polishing Vise, to hold the copper strip firmly without
From Bituminous Paving Mixtures
marring the edge while polishing. Any suitable holder may be
D5710 Specification for Trinidad Lake Modified Asphalt
used provided that the surface is held tightly and the surface
E1 Specification for ASTM Liquid-in-Glass Thermometers
being polished is supported above the surface of the holder.
3. Summary of Test Method
5.5 Viewing Test Tubes, flat glass test tubes, are convenient
for protecting corroded strip and may be used for close
3.1 Apolished copper strip is immersed in a given quantity
inspection and storage.
of sample and heated at a temperature and for a given time
characteristic of the material being tested. At the end of this
6. Materials
periodthecopperstripisremoved,washed,andcomparedwith
6.1 Wash Solvent—Any volatile, sulfur free hydrocarbon
the classifications of the TLA Copper Tarnishing Ranges for
solvent may be used that would show no tarnish when tested at
copper strips.
210°C or 225°C.
4. Significance and Use
NOTE 1—Toluene is a suitable solvent.
4.1 Bitumen contains sulfur compounds most of which are
6.2 Polishing Materials:
removed during refining, the resulting asphalt cement also
6.2.1 Silicone carbide grip paper of varying degrees of
fineness including 65 µm (240 grit) paper or cloth.
This practice is under the jurisdiction of ASTM Committee D04 on Road and
6.2.2 Silicone carbide grains 105 µm (150–mesh).
Paving Materials and is the direct responsibility of Subcommittee D04.47 on
Miscellaneous Asphalt Tests.
6.2.3 Absorbent cotton (cotton wool), pharmaceutical
Current edition approved June 1, 2006. Published June 2006. Originally
grade.
approved in 2000. Last previous edition approved in 2000 as D6608 – 00. DOI:
10.1520/D6608-00R06.
6.3 Copper Strips:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.3.1 Specifications—Use strips 12.5 mm ( ⁄2 in.) wide, 1.5
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1 1
to 3.0 mm ( ⁄16 to ⁄8 in.) thick, cut 75 mm (3 in.) long from
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. smooth-surface, hard temper, cold-finished copper of 99.9+ %
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6608−00 (2006)
purity; electrical bus bar stock is generally suitable (see Annex 7.2 To produce a test sample, heat the recovered binder
A1).Thestripsmaybeusedrepeatedlybutshouldbediscarded slowly to approximately 135°C with constant stirring, by hand,
when the surfaces become deformed on handling. untilmolten.Stirthesamplethoroughlyagainbeforedecanting
into the sample test tubes.
6.3.2 Surface Preparation—Remove all surface blemishes
from all six sides of the strip with silicone carbide paper of
8. Procedure
such varying degrees of fineness as are needed to accomplish
the desired results efficiently. Finish with 65–µm (240 grit)
8.1 Place 15–20 mLof the molten recovered binder sample,
silicone carbide paper or cloth, removing all marks that may
which is free of any entrained water or suspended water, into
have been made by other grades of paper used previously.
each of two clean and dry test tubes. Insert a polished copper
Immerse the strip in wash solvent from which it can be
stripintoeachtesttubewithinone(1)minuteofcompletingthe
withdrawn immediately for final preparation (polishing) or in
final strip preparation. Ensure that the strip is vertically held in
which it can be stored for future use. 3 1
thesamplewithapproximately44–57mm(1 ⁄4–2 ⁄4in.)ofthe
6.3.2.1 As a practical manual procedure for the surface
strip projecting out of the sample mixture.
preparation, place a sheet of paper on a flat surface, moisten it
8.2 Place the test tubes in th
...
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