ASTM C719-93(2010)
(Test Method)Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
Standard Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
SIGNIFICANCE AND USE
The failure of a building sealant in an active joint is usually manifested by cohesive failure in the sealant or adhesive failure between the sealant and the substrate, or both. The method described in this test method relates only to the performance of the sealant when properly installed with recommended primers, and does not evaluate sealant failures caused by improper joint design, excessive joint movement, improper application practices, and other factors known to cause sealant failure in buildings and building areas.
SCOPE
1.1 This test method is an accelerated laboratory procedure for evaluating the performance of a building sealant in a test configuration that is subjected to water immersion, cyclic movement, and temperature change.
1.2 The values stated in inch-pound units are to be regarded as standard. 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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation: C719 − 93(Reapproved 2010)
Standard Test Method for
Adhesion and Cohesion of Elastomeric Joint Sealants
1,2
Under Cyclic Movement (Hockman Cycle)
This standard is issued under the fixed designation C719; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4. Summary of Test Method
1.1 This test method is an accelerated laboratory procedure 4.1 This test method consists of subjecting standard joint
for evaluating the performance of a building sealant in a test specimens to a series of treatments as follows: (a) immersion
configuration that is subjected to water immersion, cyclic inwaterforsevendays;(b)exposureinanovenforsevendays
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movement, and temperature change. while under compression; (c) automatic compression and
extension cycling at room temperature at a specified rate and
1.2 The values stated in inch-pound units are to be regarded
amount of joint movement; and (d) alternate compression and
as standard. The values given in parentheses are mathematical
extension of the joint at high and low temperatures,
conversions to SI units that are provided for information only
respectively, under specified conditions described herein.
and are not considered standard.
4.2 The effects of the test shall be evaluated by visual
1.3 This standard does not purport to address all of the
inspection for cohesive and adhesive failures, sealant
safety concerns, if any, associated with its use. It is the
deformation, and bubble formation within the sealant.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.3 This test method is applicable to any joint movement.
bility of regulatory limitations prior to use.
The most common test movements are 612.5 and 625% as
used in the examples.
2. Referenced Documents
5. Significance and Use
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2.1 ASTM Standards:
5.1 The failure of a building sealant in an active joint is
C33Specification for Concrete Aggregates
usually manifested by cohesive failure in the sealant or
C109/C109MTest Method for Compressive Strength of
adhesive failure between the sealant and the substrate, or both.
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
The method described in this test method relates only to the
Specimens)
performance of the sealant when properly installed with
C150Specification for Portland Cement
recommended primers, and does not evaluate sealant failures
C717Terminology of Building Seals and Sealants
caused by improper joint design, excessive joint movement,
3. Terminology improper application practices, and other factors known to
cause sealant failure in buildings and building areas.
3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology C717.
6. Apparatus
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6.1 Compression-Extension Machine, designedtoautomati-
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cally compress the joint width of the test specimen from ⁄2 in.
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ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on (12.7 mm) to the minimum dimension desired (Table 1,
Adhesion.
Current edition approved June 15, 2010. Published August 2010. Originally
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approvedin1972.Lastpreviouseditionapprovedin2005asC719–93(2005).DOI: Series 520 Sealing Compound Tester, manufactured by Applied Test Systems
10.1520/C0719-93R10. Inc.,348NewCastleRd.,Butler,PA16001,andadurabilitytestermanufacturedby
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This test method is also known as the Hockman Cycle in recognition ofArthur Ambard, Inc., 269-11 81st Ave., New Hyde Park, NY 11040, have been found
Hockman who originated the method at the National Bureau of Standards. suitable for this purpose (Fig. 1(a)). For extension of the joint at cold temperature,
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Supporting data are available fromASTM International Headquarters. Request the machine may be designed for extension only (Fig. 3).
RR:C24-1013. The sole source of supply of the apparatus known to the committee at this time
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or is Applied Test Systems Inc. and Ambard Inc. If you are aware of alternative
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM suppliers, please provide this information to ASTM International Headquarters.
Standards volume information, refer to the standard’s Document Summary page on Your comments will receive careful consideration at a meeting of the responsible
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the ASTM website. technical committee , which you may attend.
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