ASTM D6924-03(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6924 −03(Reapproved 2007)
Standard Specification for
Preformed Thermoplastic Vulcanizate Elastomeric Joint
Seals for Bridges
This standard is issued under the fixed designation D6924; 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 D1149 Test Methods for Rubber Deterioration—Cracking in
an Ozone Controlled Environment
1.1 This specification covers the material requirements for
D2240 Test Method for Rubber Property—Durometer Hard-
preformed thermoplastic vulcanizate (TPV) elastomeric joint
ness
seals for bridges. The seal consists of a multiple-web design
D4483 Practice for Evaluating Precision for Test Method
composed of a TPV and functions only by compression of the
Standards in the Rubber and Carbon Black Manufacturing
seal between the faces of the joint with the seal folding inward
Industries
at the top to facilitate compression. The seal is installed with a
D6338 Classification System for Highly Crosslinked Ther-
lubricant adhesive and is designed to seal the joint and reject
moplastic Vulcanizates (HCTPVs) Based onASTM Stan-
incompressibles.
dard Test Methods
NOTE 1—This specification may not be applicable for seals whose
height is less than 90 % of its nominal width.
3. Marking and Ordering Information
1.2 The values stated in inch-pound units are to be regarded
3.1 Each lot of seal shall be marked with characters of not
as the standard. The values given in parentheses are provided
less than 0.25 in. (6.35 mm) in height on the top of the seal at
for information only.
a maximum of 4 ft (1.22 m) intervals showing the lot number,
1.3 This standard does not purport to address all of the
date of manufacture, and the manufacturing seal designation.
safety concerns, if any, associated with its use. It is the
3.2 The purchaser shall specify the anticipated required
responsibility of the user of this standard to establish appro-
minimum acceptable joint movement, and either the minimum
priate safety and health practices and determine the applica-
joint opening, or the nominal width of seal.
bility of regulatory requirements prior to use.
4. Materials and Manufacture
2. Referenced Documents
4.1 The seals shall be preformed, and the material shall be
2.1 ASTM Standards: vulcanized elastomeric compound using a thermoplastic vul-
D395 Test Methods for Rubber Property—Compression Set canizate as the compound. A thermoplastic vulcanizate is a
D412 Test Methods forVulcanized Rubber andThermoplas- blend of a crosslinked rubber and a thermoplastic polymer that
tic Elastomers—Tension can be processed on conventional thermoplastic processing
D518 Test Method for Rubber Deterioration—Surface machinery and has the properties of a crosslinked elastomer.
Cracking (Withdrawn 2007) Highly crosslinked thermoplastic elastomers are classified
D573 Test Method for Rubber—Deterioration in an Air according to Classification System D6338. TPV materials are
Oven made in the dynamic vulcanization process. One example of a
D575 Test Methods for Rubber Properties in Compression typical TPV is crosslinked ethylene propylene diene rubber
blended with polypropylene. The TPV material can also
contain processing oils, antioxidants, fillers, or other additives.
This specification is under the jurisdiction of ASTM Committee D04 on Road
5. Physical Requirements
and Paving Materials and is the direct responsibility of Subcommittee D04.34 on
5.1 The materials shall conform to the physical properties
Preformed Joint Fillers, Sealers and Sealing Systems.
Current edition approved Dec. 1, 2007. Published January 2008. Originally
prescribed in Table 1.
approved in 2003. Last previous edition approved in 2003 as D6924 – 03. DOI:
5.2 In the applicable requirements of Table 1 and the test
10.1520/D6924-03R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
methods, all deflection shall be based on the nominal width.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
6. Dimensions and Working Parameters
the ASTM website.
6.1 The size, shape and dimensional tolerances shall be as
The last approved version of this historical standard is referenced on
www.astm.org. outlined in 6.1.1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6924−03 (2007)
TABLE 1 Physical Requirements for Preformed Elastomeric
thantheminimumanticipatedjointopening,andthemovement
Joint Seals
range requirement is met.
ASTM
6.2.2 The minimum limit of compressibility (LC min) is
Requirements
Test Method
defined as the compressed width (expressed in terms of percent
Tensile strength, min, psi (MPa) 730 (4.4) D412
of nominal width) corresponding to a contact pressure of 3 psi
Elongation at break, min, % 300 D412
Hardness, Type A durometer, points 50 to 70 D2240 (20.68 kPa). The LC min shall be determined in accordance
A
(modified)
with 9.3. For the purpose of calculating movement range, a
Oven aging, 168 h at 212°F (100°C)
value at 85 % of nominal width shall be used for LC min when
Tensile strength, max, % loss 10
the measured value of LC min exceeds 85 %.
Elongation, max, % loss 10
Hardness, Type A durometer, 0to5
NOTE 2—If the seal generates a pressure of 3 psi at 90 % of nominal
points change
B C
Ozone resistance no cracks D1149 width, LC min equals 85 %. However, if the seal generates 3 psi at 70 %
20 % strain, 300 pphm in air, 70 h,
of nominal width, the LC min equals 70 %.
at 104°F (40°C) (wiped with toluene
6.2.3 The maximum limit of compressibility (LC max) is
to remove surface contamination)
Low-temperature recovery,
defined as the compressed width (expressed in terms of percent
72 h at 14°F (-10°C), 50 %:
ofnominalwidth)correspondingtoacontactpressureof35psi
D
Deflection, min, % 80 Section 7
(241.32 kPa). The LC max shall be determined in accordance
Low-temperature recovery,
22 h at -20°F (-29°C), 50 %:
with 9.3. LC max has been designated at 35 psi (241.32 kPa)
D
Deflection, min, % 70 Section 7
inordertomitigatethetendenciestowardpressuredecayofthe
High-temperature recovery,
seal during use. A reading of 35 psi is considered an absolute
70 h, at 212°F (100°C), 50 %:
D
Deflection, min, % 75 Section 7
maximum pressure which should not be exceeded.
Compression-deflection properties:
6.2.4 The movement range of the seal is defined as the
LC min in. (mm) 9.3 D575 Method A
E
numerical difference between the LC min and the LC max
LC max in. (mm) 9.3 (modified)
Movement range, in. (mm) 9.3
expressed in inches (mm). For the purpose of calculating the
A
The term “modified” in the table relates to the specimen preparation. The use of movement range, a value at 85 % shall be used for LC min
the joint seal as the specimen source requires that more plies than specified in
when the measured value of LC min exceeds 85 %. For
either of the modified test procedures be used. Such specimen modification shall
purposes of acceptance testing, the calculated movement range
be agreed upon between the purchaser and the supplier prior to testing. The
hardness test shall be made with the durometer in a durometer stand as
of the seal shall not be less than the specified value.
recommended in Test Method D2240.
B
Sample prepared in accordance with Method A of Test Method D518.
7. Sampling
C
Cracking, splitting, or sticking of a specimen during a recovery test shall mean
that the specimen has failed the test.
7.1 Alot shall consist of the quantity for each cross section
D
Thereferencesectionandsubsectionsarethoseofthisspecification.Thevalues
agreed upon between the purchaser and the supplier.
foundin6.2.2,6.2.3,and6.2.4shallbewithintherangespecifiedbythepurchaser
in 3.2.
7.2 Samplesshallbetakenatrandomfromeachshipmentof
E
Speed of testing shall be 0.5 ± 0.05 in. (13 ± 1.3 mm), min at room temperature
material. If the shipment consists of more than one lot, each lot
of 73 ± 4°F (23 ± 2.2°C). The sheets of sandpaper are not used.
shall be sampled.
7.3 The minimum lengths of samples for testing purposes
shallbeasprescribedbythepurchaserorasprescribedinTable
6.1.1 Measurements used for laboratory testing shall be
2.
taken to the nearest 0.01 in. (0.3 mm) and reported/recorded to
the nearest 0.1 in. (3 mm) as the average of three measure-
8. Specimen Preparation
ments.Themeasuredwidthshallbegreaterthanorequaltothe
8.1 All test specimens shall be cut, buffed, or both from the
nominal width. The seal height shall not be less than 90 % of
sample of preformed seal. Care should be taken not to overheat
the nominal width unless joint recess dimensions or special
the test specimen during buffing. The cut shall be square to
design considerations dictate the geometry.
within 2° and smooth, with no roughness visible to the naked
6.2 Compression Deflection Properties—The contact pres-
eye. The use of a tooth blade device or a guillotine-type cutter,
sure expressed in pounds-force per square inch (or pascals)
or both, is not acceptable. This process will eliminate irregu-
when the seal is compressed to any particular width indicates
larities.
the stress-strain relationship that exists in the seal. This
8.2 Specimens for determining tensile strength and elonga-
relationship is dependent on both the properties of the elasto-
tion (Test Methods D412) shall be prepared using Die C when
mer and the cross-sectional configuration of the seal.
possible. Die D may be used when the flat sections of a seal are
Therefore, for a predetermined allowable pressure, a definitive
too small for Die C. However, the requirement of Table 1 shall
relationshipwillexistandtheworkinglimitsofthesealmaybe
defined.
TABLE 2 Minimum Lengths of
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