ASTM D6948-03
(Practice)Standard Practice for Application of Refined Coal Tar (Ready to Use, Commercial Grade)
Standard Practice for Application of Refined Coal Tar (Ready to Use, Commercial Grade)
SIGNIFICANCE AND USE
This practice is designed as a guide for architects, engineers, property owners or their representatives, or combination thereof. Its use helps ensure the satisfactory performance of the protective coating system when applied over bituminous concrete pavements.
SCOPE
1.1 This practice covers the application of emulsified refined coal tar slurry meeting the requirements of Specification D 6945 Types I and II, by mechanized equipment as a weather protection and petroleum (aliphatic) solvent resistant sealer for use on bituminous concrete pavements. In order to clarify the differences between Types I and II, see 3.3 for standard definition of terms.
1.2 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)
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Designation: D6948 – 03
Standard Practice for
Application of Refined Coal Tar (Ready to Use, Commercial
Grade)
This standard is issued under the fixed designation D6948; 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 3.1.2 Specification D6945 Type II material—is Specifica-
tion D5727 material diluted with water typically by the
1.1 This practice covers the application of emulsified re-
applicator after which additive and aggregate is added.
fined coal tar slurry meeting the requirements of Specification
3.2 The mixtures described in 3.1.1 and 3.1.2 can be
D6945 Types I and II, by mechanized equipment as a weather
submitted to a laboratory approved by the owner for testing of
protection and petroleum (aliphatic) solvent resistant sealer for
their conformance to Specification D6945 Type I or Type II
use on bituminous concrete pavements. In order to clarify the
prior to their actual use on the job.
differences between Types I and II, see 3.3 for standard
3.3 Definitions:
definition of terms.
3.3.1 additive—one or more ingredients that can be added
1.2 This standard does not purport to address all of the
to a specific refined coal tar emulsion, water, or sand (or
safety concerns, if any, associated with its use. It is the
combination thereof) mixture to improve the coatings’ dura-
responsibility of the user of this standard to establish appro-
bility, fuel resistance, drying time, color uniformity, or length
priate safety and health practices and determine the applica-
of time required before opening the surface to traffic, or
bility of regulatory limitations prior to use.
combination thereof. This material can also be used to modify
2. Referenced Documents
the wet mixture’s viscosity to improve aggregate suspension.
Because there is such a wide variance of additives on the
2.1 ASTM Standards:
market, the aforementioned results may not take place. If an
D490 Specification for Road Tar
additive is used, it is recommended that it be supplied by the
D5727 Specification for Emulsified Refined Coal Tar (Min-
same manufacturer as the refined coal tar emulsion.
eral Colloid Type)
3.3.2 application rate—the volume of mixed materials ap-
D6945 Specification for Emulsified Refined Coal-Tar
plied per area of pavement surface, usually expressed in liters
(Ready to Use, Commercial Grade)
2 2
per square meter (l/m ) (gallons per square yard (gal/yd )).
3. Terminology
3.3.3 applied mixture—the combination of all ingredients
mixed together and ready for application to the pavement.Also
3.1 Two types of mixtures are defined in Specification
referred to as seal coat or sealer.
D6945.Theingredientsforbothtypesofmixturesarenormally
3.3.4 bituminous concrete pavements, new—pavements that
combined at the contractor’s yard or at the job site. Refined
have been placed less than 90 days.
coal tar emulsion meeting Specification D5727 is concentrated
3.3.5 bituminous concrete pavements, aged—pavements
when shipped from the manufacturer to the applicator.
that weathered over at least one summer season and have
3.1.1 Specification D6945 Type I material—is Specification
shown signs of one or more of the following: cracking,
D5727 material diluted with water typically by the applicator
raveling, aggregate polishing or graying due to oxidation, or
after which aggregate is added.
combination thereof.
3.3.6 brush applicator—a hand type or mechanized brush
used to apply pavement sealer.
ThispracticeisunderthejurisdictionofASTMCommitteeD08onRoofingand
3.3.7 crack filler—a material that is placed in a pavement
Waterproofing and is the direct responsibility of Subcommittee D08.09 on Bitumi-
crack or joint to fill but not necessarily seal the void created by
nous Emulsions.
the crack or joint.
Current edition approved July 10, 2003. Published August 2003. DOI: 10.1520/
D6948-03.
3.3.8 crack sealant—a material that has adhesive and cohe-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sive properties to seal cracks, joints or other narrow openings
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
(less than 38.5 mm (1- ⁄2 in.) wide) in pavements against the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. entrance or passage of water or other debris.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6948 – 03
3.3.9 crude coal tar—condensed material taken from the 5.3 Oil Spot Primer—As specified by the refined coal tar
coking process (high temperature heating of coal under a emulsion manufacturer.
vacuum) and containing all of the volatile constituents. 5.4 Pavement Primer—As specified by the refined coal tar
3.3.10 cure, final (of the seal coat)—the process of evapo- emulsion manufacturer.
ration of water and volatiles of the applied seal coating mixture
over the period of days resulting in the coating reaching its 6. Equipment
ultimate strength. The duration of this process is dependent
6.1 Use application equipment that is capable of applying
upon ambient conditions.
the required coating rates evenly over the entire width of the
3.3.11 cure, initial (of the seal coat)—the condition of an
application mechanism to provide a continuously coated sur-
applied seal coating material that enables it to withstand
face. For spray units, this can be accomplished with either a
vehicle traffic without damage to the seal coat.
spray bar or a wand-type application device. To ensure this,
3.3.12 drying (of the seal coat)—the process of evaporation
equip all spray units with a pumping distribution system using
of water of the applied seal coating mixture resulting in the
positive displacement pumps.All squeegee/brush units shall be
coating being able to sustain light foot traffic.
properly adjusted and in condition for application of seal coat
3.3.13 mechanized application equipment—equipment used
materials so that there are no streaks in the coating.
to mix and apply the refined coal tar emulsion mixture either
6.2 Bulk storage tanks shall be capable of mixing or
with a spray or squeegee unit.
circulating, or both, the coat tar emulsion to a uniform
3.3.14 priming—application of an initial coat of a material
consistency.
designed to assist the adhesion of the additional coats of seal
6.3 The mixing part of the application equipment must be
coating materials. Primers are always used as under coatings
tank type with a mechanically powered, full sweep mixer
and are not designed to be used by themselves.
capable of homogeneously mixing the entire contents of the
3.3.15 refined coal tar—a selectively distilled coal tar
tank.
meeting the requirements of Specification D490, grade RT-12.
6.4 Use of hand squeegee or brush application will be
3.3.16 refined coal tar emulsion—a stable and homoge-
restricted to places not accessible to mechanized equipment, or
neous dispersion of refined coal tar, clay, mineral fillers, and
to accommodate neat trim work at curbs and so forth. Material
specialty chemicals in water.
that is applied by hand application shall meet the same
3.3.17 seal coating—process of applying a protective coat-
standards as that applied by machine.
ing to a bituminous concrete pavement.
3.3.18 spray unit—a piece of equipment equipped with a
7. Surface Preparation
mixing tank and positive displacement pump that can homo-
7.1 Preparation of Aged Asphalt Pavement Surfaces (see
geneously mix and apply protective coatings uniformly over
3.3.5).
the entire width of a spray bar or wand type application device.
7.1.1 Patching—Patch all bituminous concrete pavement
3.3.19 squeegee unit—a piece of equipment equipped with
surfaces which have been softened by petroleum derivates or
a mixing tank and squeegeeing mechanism that can homoge-
have failed due to any other cause. Remove the damaged
neously mix and apply protective coatings uniformly over the
pavement to the full depth of the damage and replace with new
entire width of a rubber squeegee or brush type application
asphalt concrete similar to that of the existing pavement. If a
device.
solvent containing cold-applied material is used, complete
3.3.20 traffıcability—the ability of an applied seal coating
patchingaminimumof90dayspriortotheplannedapplication
material to withstand vehicle traffic without damage to the seal
of the sealer to permit solvent escape bef
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