ASTM D6924-03(2017)
(Specification)Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges
Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges
ABSTRACT
This specification covers the material requirements for preformed thermoplastic vulcanizate (TPV) elastomeric joint seals for bridges. The seal consists of a multiple-web design composed of a TPV and functions only by compression of the seal between the faces of the joint with the seal folding inward at the top to facilitate compression. The seal is installed with a lubricant adhesive and is designed to seal the joint and reject incompressibles. The physical properties for which the seals shall be tested on and conform accordingly to are tensile strength, elongation at break, hardness, oven aging, ozone resistance, low- and high-temperature recovery, and compression-deflection properties.
SCOPE
1.1 This specification covers the material requirements for preformed thermoplastic vulcanizate (TPV) elastomeric joint seals for bridges. The seal consists of a multiple-web design composed of a TPV and functions only by compression of the seal between the faces of the joint with the seal folding inward at the top to facilitate compression. The seal is installed with a lubricant adhesive and is designed to seal the joint and reject incompressibles.
Note 1: This specification may not be applicable for seals whose height is less than 90 % of its nominal width.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.
1.3 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 requirements prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D6924 −03 (Reapproved 2017)
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 Cracking (Withdrawn 2007)
D573 Test Method for Rubber—Deterioration in an Air
1.1 This specification covers the material requirements for
Oven
preformed thermoplastic vulcanizate (TPV) elastomeric joint
D575 Test Methods for Rubber Properties in Compression
seals for bridges. The seal consists of a multiple-web design
D1149 Test Methods for Rubber Deterioration—Cracking in
composed of a TPV and functions only by compression of the
an Ozone Controlled Environment
seal between the faces of the joint with the seal folding inward
D2240 Test Method for Rubber Property—Durometer Hard-
at the top to facilitate compression. The seal is installed with a
ness
lubricant adhesive and is designed to seal the joint and reject
D4483 Practice for Evaluating Precision for Test Method
incompressibles.
Standards in the Rubber and Carbon Black Manufacturing
NOTE 1—This specification may not be applicable for seals whose
height is less than 90 % of its nominal width. Industries
D6338 Classification System for Highly Crosslinked Ther-
1.2 The values stated in inch-pound units are to be regarded
moplastic Vulcanizates (HCTPVs) Based onASTM Stan-
as the standard. The values given in parentheses are provided
dard Test Methods
for information only.
1.3 This standard does not purport to address all of the
3. Marking and Ordering Information
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.1 Each lot of seal shall be marked with characters of not
priate safety and health practices and determine the applica-
less than 0.25 in. (6.35 mm) in height on the top of the seal at
bility of regulatory requirements prior to use. a maximum of 4-ft (1.22-m) intervals showing the lot number,
1.4 This international standard was developed in accor-
date of manufacture, and the manufacturing seal designation.
dance with internationally recognized principles on standard-
3.2 The purchaser shall specify the anticipated required
ization established in the Decision on Principles for the
minimum acceptable joint movement, and either the minimum
Development of International Standards, Guides and Recom-
joint opening, or the nominal width of seal.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Materials and Manufacture
2. Referenced Documents
4.1 The seals shall be preformed, and the material shall be
vulcanized elastomeric compound using a thermoplastic vul-
2.1 ASTM Standards:
canizate as the compound. A thermoplastic vulcanizate is a
D395 Test Methods for Rubber Property—Compression Set
blend of a crosslinked rubber and a thermoplastic polymer that
D412 Test Methods forVulcanized Rubber andThermoplas-
can be processed on conventional thermoplastic processing
tic Elastomers—Tension
machinery and has the properties of a crosslinked elastomer.
D518 Test Method for Rubber Deterioration—Surface
Highly crosslinked thermoplastic elastomers are classified
according to Classification System D6338. TPV materials are
made in the dynamic vulcanization process. One example of a
This specification is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.34 on
typical TPV is crosslinked ethylene propylene diene rubber
Preformed Joint Fillers, Sealers and Sealing Systems.
blended with polypropylene. The TPV material can also
Current edition approved July 1, 2017. Published July 2017. Originally approved
contain processing oils, antioxidants, fillers, or other additives.
in 2003. Last previous edition approved in 2012 as D6924 – 03 (2012). DOI:
10.1520/D6924-03R17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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 The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6924−03 (2017)
5. Physical Requirements mer and the cross-sectional configuration of the seal.
Therefore, for a predetermined allowable pressure, a definitive
5.1 The materials shall conform to the physical properties
relationshipwillexistandtheworkinglimitsofthesealmaybe
prescribed in Table 1.
defined.
5.2 In the applicable requirements of Table 1 and the test
6.2.1 The working limits (minimum and maximum degrees
methods, all deflection shall be based on the nominal width.
of compression) of the seal shall be determined on the basis of
the minimum and maximum limits of compressibility (LC
min
6. Dimensions and Working Parameters
and LC ), and the movement range as specified herein. Seals
max
6.1 The size, shape, and dimensional tolerances shall be as
with nominal width differing from that specified are
outlined in 6.1.1.
acceptable, providing the compressed width at LC is less
max
6.1.1 Measurements used for laboratory testing shall be
thantheminimumanticipatedjointopening,andthemovement
taken to the nearest 0.01 in. (0.3 mm) and reported/recorded to
range requirement is met.
the nearest 0.1 in. (3 mm) as the average of three measure-
6.2.2 The minimum limit of compressibility (LC )is
min
ments.Themeasuredwidthshallbegreaterthanorequaltothe
defined as the compressed width (expressed in terms of percent
nominal width. The seal height shall not be less than 90 % of
of nominal width) corresponding to a contact pressure of 3 psi
the nominal width unless joint recess dimensions or special
(20.68 kPa).The LC shall be determined in accordance with
min
design considerations dictate the geometry.
9.3. For the purpose of calculating movement range, a value at
85 % of nominal width shall be used for LC when the
6.2 Compression Deflection Properties—The contact pres-
min
measured value of LC exceeds 85 %.
sure expressed in pounds-force per square inch (or pascals)
min
when the seal is compressed to any particular width indicates
NOTE 2—If the seal generates a pressure of 3 psi at 90 % of nominal
the stress-strain relationship that exists in the seal. This
width, LC equals 85 %. However, if the seal generates 3 psi at 70 % of
min
nominal width, the LC equals 70 %.
relationship is dependent on both the properties of the elasto-
min
6.2.3 The maximum limit of compressibility (LC )is
max
TABLE 1 Physical Requirements for Preformed Elastomeric defined as the compressed width (expressed in terms of percent
Joint Seals
ofnominalwidth)correspondingtoacontactpressureof35psi
ASTM
(241.32 kPa). The LC shall be determined in accordance
max
Requirements
Test Method
with 9.3.LC has been designated at 35 psi (241.32 kPa) in
max
Tensile strength, min, psi (MPa) 730 (4.4) D412
order to mitigate the tendencies toward pressure decay of the
Elongation at break, min, % 300 D412
seal during use. A reading of 35 psi is considered an absolute
Hardness, Type A durometer, points 50 to 70 D2240
A
(modified)
maximum pressure which should not be exceeded.
Oven aging, 168 h at 212 °F
6.2.4 The movement range of the seal is defined as the
(100 °C)
numerical difference between the LC and the LC ex-
Tensile strength, max, % loss 10 min max
Elongation, max, % loss 10
pressed in inches (mm). For the purpose of calculating the
Hardness, Type A durometer, 0to5
movement range, a value at 85 % shall be used for LC when
min
points change
B C
the measured value of LC exceeds 85 %. For purposes of
Ozone resistance no cracks D1149
min
20 % strain, 300 pphm in air, 70 h,
acceptance testing, the calculated movement range of the seal
at 104 °F (40 °C) (wiped with toluene
shall not be less than the specified value.
to remove surface contamination)
Low-temperature recovery,
7. Sampling
72 h at 14 °F (–10 °C), 50 %:
D
Deflection, min, % 80 Section 7
7.1 Alot shall consist of the quantity for each cross section
Low-temperature recovery,
agreed upon between the purchaser and the supplier.
22 h at –20 °F (–29 °C), 50 %:
D
Deflection, min, % 70 Section 7
7.2 Samplesshallbetakenatrandomfromeachshipmentof
High-temperature recovery,
70 h, at 212 °F (100 °C), 50 %: material. If the shipment consists of more than one lot, each lot
D
Deflection, min, % 75 Section 7
shall be sampled.
Compression-deflection properties:
LC in. (mm) 9.3 D575 Method A
min 7.3 The minimum lengths of samples for testing purposes
E
LC in. (mm) 9.3 (modified)
max
shallbeasprescribedbythepurchaserorasprescribedinTable
Movement range, in. (mm) 9.3
2.
A
The term “modified” in the table relates to the specimen preparation. The use of
the joint seal as the specimen source requires that more plies than specified in
8. Specimen Preparation
either of the modified test procedures be used. Such specimen modification shall
be agreed upon between the purchaser and the supplier prior to testing. The
8.1 All test specimens shall be cut, buffed, or both from the
hardness test shall be made with the durometer in a durometer stand as
sample of preformed seal. Care should be taken not to overheat
recommended in Test Method D2240.
B
Sample prepared in accordance with Method A of Test Method D518.
C
Cracking, splitting, or sticking of a specimen during a recovery test shall mean TABLE 2 Minimum Lengths of Seal Samples
that the specimen has failed the test.
Seal Size, Length of Sample,
D
Thereferencesectionandsubsectionsarethoseofthisspecification.Thevalues
in. (mm) in. (m)
foundin6.2.2,6.2.3,and6.2.4shallbewithintherangespecifiedbythepurchaser
Less than 2 (51) 96 (2.44)
in 3.2.
E
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