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ASTM D8138-18

(Specification)

Standard Specification for Preformed Silicone Joint Sealing System for Bridges

Standard Specification for Preformed Silicone Joint Sealing System for Bridges

ABSTRACT
This specification covers the material, manufacturing, and physical requirements for preformed silicone joint seals used in bridges. The seal consists of a silicone rubber gland preformed to a continuous length and is designed to prevent any tension from occurring in the seal or bonding point during normal movement. The seal is installed by bonding it to the joint header with a silicone-based adhesive, sealing the joint to prevent liquid intrusion. Physical requirements for the preformed silicone joint seal gland cover resistance to accelerated weathering, tensile strength, elongation at break, hardness, tear strength, compression set, and heat-aged properties, whereas physical requirements for the silicone-based adhesive cover tensile strength, elongation at break, sag/flow, tack-free time, resistance to UV, and cure through to 1/4-in. thickness.
This specification also includes requirements for working parameters, sampling, specimen preparation, test methods, and certification and acceptance.
SCOPE
1.1 This specification covers the material requirements for preformed silicone joint seals for bridges. The seal consists of a silicone rubber gland preformed to a continuous length. Its design shall prevent any tension from occurring in the seal or bonding point during normal movement. The seal is installed by bonding it to the joint header with a silicone-based adhesive and is designed to seal the joint, preventing liquid intrusion.  
1.2 The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations 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

Status
Historical
Publication Date
31-Mar-2018
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
D04 - Road and Paving Materials
Drafting Committee
D04.32 - Bridges and Structures
Current Stage
Ref Project

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ASTM D8138-18 - Standard Specification for Preformed Silicone Joint Sealing System for BridgesASTM D8138-18 - Standard Specification for Preformed Silicone Joint Sealing System for Bridges
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ASTM D8138-18 - Standard Specification for Preformed Silicone Joint Sealing System for Bridges
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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: D8138 − 18
Standard Specification for
1
Preformed Silicone Joint Sealing System for Bridges
This standard is issued under the fixed designation D8138; 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 D573 Test Method for Rubber—Deterioration in an Air
Oven
1.1 This specification covers the material requirements for
D624 Test Method for Tear Strength of Conventional Vul-
preformed silicone joint seals for bridges. The seal consists of
canized Rubber and Thermoplastic Elastomers
a silicone rubber gland preformed to a continuous length. Its
D2240 Test Method for Rubber Property—Durometer Hard-
design shall prevent any tension from occurring in the seal or
ness
bonding point during normal movement. The seal is installed
by bonding it to the joint header with a silicone-based adhesive
3. Materials and Manufacture
and is designed to seal the joint, preventing liquid intrusion.
3.1 The seals shall be preformed to a continuous length, and
1.2 The values given in parentheses are mathematical con-
the material shall be silicone rubber.
versions to SI units that are provided for information only and
are not considered standard.
3.2 The adhesive shall be a silicone-based adhesive.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4. Physical Requirements
responsibility of the user of this standard to establish appro-
4.1 The materials for the seal shall conform to the physical
priate safety, health, and environmental practices and deter-
properties prescribed in Table 1.
mine the applicability of regulatory limitations prior to use.
4.2 The materials for the adhesive shall conform to the
1.4 This international standard was developed in accor-
physical properties prescribed in Table 2.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.3 In the applicable requirements of Table 1 and the test
Development of International Standards, Guides and Recom-
method, all deflection shall be based on the nominal width.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Dimensions and Working Parameters
5.1 The size, shape, and dimensional tolerances shall be as
2. Referenced Documents
outlined in 5.2.
2
2.1 ASTM Standards:
5.2 Measurements used for physical laboratory testing shall
C639 Test Method for Rheological (Flow) Properties of
be taken to the nearest 0.01 in. (0.3 mm) and reported/recorded
Elastomeric Sealants
to the nearest 0.1 in. (3 mm) as the average of the measure-
C679 Test Method for Tack-Free Time of Elastomeric Seal-
ments. The measured width shall be greater than or equal to the
ants
nominal width. Measurements shall be taken at quarter points
C793 Test Method for Effects of Laboratory Accelerated
of the sample.
Weathering on Elastomeric Joint Sealants
D395 Test Methods for Rubber Property—Compression Set
5.3 The lengths of samples for performance testing purposes
D412 Test Methods for Vulcanized Rubber and Thermoplas-
shall be 2 ft 6 0.25 in. (601 6 6 mm) length for the seal and
tic Elastomers—Tension
appropriate amount of silicone-based adhesive per manufac-
turer’s recommendation.
1
This specification is under the jurisdiction of ASTM Committee D04 on Road
6. Sampling
and Paving Materials and is the direct responsibility of Subcommittee D04.32 on
Bridges and Structures.
6.1 Samples shall be taken at random from each shipment of
Current edition approved April 1, 2018. Published April 2018. Originally
material. If the shipment consists of more than one lot, each lot
approved in 2018. DOI: 10.1520/D8138-18.
2
shall be sampled.
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
6.2 A lot shall consist of the quantity for each copious
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. section agreed upon between the purchaser and the supplier.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D8138 − 18
TABLE 1 Physical Requirements for Preformed Silicone Joint Seal Gland
Requirements ASTM Test Method
Resistance to accelerated weathering, 5000 h No cracking or degradation C793 – Fluorescent UV accelerated weathering tester (QUV)
Tensile strength, min, psi 1000 D412
Elongation at break, min, % 400 D412
Hardness, type A durometer, points 55 ±
...

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1.2.1 Section 7.4 specifies SI units because they are the units used in the equations for Test Methods D1188/D1188M and D2726/D2726M. Performing calculations without first converting any measurements made in inch-pound units to SI units in 7.4 will result in nonconformance with the standard.  
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