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)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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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
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
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
6.1 Compression-Extension Machine, designedtoautomati-
cally compress the joint width of the test specimen from ⁄2 in.
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
approvedin1972.Lastpreviouseditionapprovedin2005asC719–93(2005).DOI: Series 520 Sealing Compound Tester, manufactured by Applied Test Systems
10.1520/C0719-93R10. Inc.,348NewCastleRd.,Butler,PA16001,andadurabilitytestermanufacturedby
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,
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
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
the ASTM website. technical committee , which you may attend.
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C719 − 93 (2010)
TABLE 1 Examples of Dimensions in Compression and
graded, concrete fine aggregate (sand) conforming to Specifi-
Extension
cationC33.Usesufficientwatertoproduceaflowof10065%
Dimension
when tested in accordance with the procedure for the determi-
Class C—Width of Joint in E—Width of Joint in
nation of consistency of cement mortar described in Test
Compression, in. (mm) Extension, in. (mm)
7 9
Method C109/C109M. After curing one day in moist air and
12.5 ⁄16 (11.1) ⁄16 (14.3)
3 5
25 ⁄8 (9.5) ⁄8 (15.9)
six days in saturated lime water at 73 6 3°F (23 6 2°C),
prepare the surface of one face, 1 by 3 in. (25 by 75 mm), of
each block by wet grinding either with a belt sander using No.
Column C) and extend the specimen from ⁄2 in. to the
60aluminumcarbidesandingbeltorusinganironlapwithNo.
maximum extension desired (Table 1, Column E) at a constant
60 silicon carbide (or aluminum oxide) grain until the aggre-
rateof ⁄8in./h(3.2mm/h).Themachineshallbeequippedwith
gate is uniformly exposed. Return blocks to saturated lime
grips of sufficient strength to withstand, without bending, the
water storage until needed.
resistance of high tensile strength sealants (see Figs. 1-3).
7.1.1.1 Blocks may be prepared and shipped to other loca-
tions for use. The blocks may be shipped dry and shall be
6.2 Cold Box or Chamber, maintained at−15 6 3°F (−26.1
returned to lime water storage on arrival until needed.
6 1.7°C).
7.1.1.2 Prior to use, wet grind the previously ground face to
6.3 Forced-Draft Oven, controlled at 158 6 3.6°F (70 6
remove any laitance, rinse thoroughly under running tap water
2°C).
and dry the blocks overnight at 220 to 230°F (105 to 110°C).
6.4 C-clamps, or other device for maintaining the specimen
Clean the blocks of film or powder by vigorous brushing with
under compression.
a stiff-bristled fiber brush. Condition the blocks at standard
conditions for not less than one day and not more than seven
6.5 Spacer Blocks.
days.
6.6 Room or Chamber, maintained at standard conditions of
7.1.2 Float Glass— Glass plates shall be 3 by 1 by ⁄4 in.
73.4 6 3.6°F (23 6 2°C), 50 6 5% relative humidity.
(76.2 by 25.4 by 6.4 mm) clear float glass. Prior to use, the
glass shall be cleaned by wiping the surface with methyl ethyl
7. Test Specimens
ketone or similar solvent. Then dip the surface in a detergent
7.1 The standard substrate used in the test shall be portland
solution.Thisshouldbea0.04%solutionofanalcoholethoxy
cement mortar, float glass, and aluminum alloy. 6
sulfate. An alternative would be a 0.1% solution of a clear
hand dishwashing detergent. These solutions should be made
NOTE 1—When requested, only one or two of the standard materials
may be tested with the sample. Likewise other substrates such as brick,
marble, wood, etc., may be specified by the purchaser in place of or in
addition to the standard substrate for test with the sealant sample.
Neodol 25-35, a registered trademark of Shell Oil Co., One Shell Plaza,
Houston, TX 77002, has been found suitable for this purpose.
7.1.1 Mortar Block— Prepare cement mortar blocks, each 3
Dawn, a registered trademark of Proctor & Gamble Co., P.O. Box 599,
by 1 by 1 in. (75 by 25 by 25 mm) in size, using one part of
Cincinnati, OH 54201, or Palmolive Green, a registered trademark of Colgate
high early strength portland cement conforming to Type III of
PalmoliveCo.,300-TParkAve.,NewYork,NY10022havebeenfoundsuitablefor
Specification C150 to two parts by weight of clean uniformly this purpose.
FIG. 1 Compression-Extension Machine
C719 − 93 (2010)
FIG. 2 Compression-Extension Machine with Control Unit
FIG. 3 Top View of Machine in Fig. 2 Showing Three Specimens Ready for Automatic Cycling
up in distilled or deionized water. Rinse the surface (without 25.4 by 6.4 mm) aluminum plates to the two outside surfaces
touching it) in distilled or deionized water and allow it to air of the formed test specimen. Any adhesive may be used.
dry.Thefloatglassrequiresreinforcementtosurvivetherigors Commercially available two part epoxies have been found
of the subsequent testing procedures. This must be done prior suitable. Although the time of reinforcement is not critical,
to the compression-extension cycling performed in 9.4. Rein- application of the aluminum plates to the glass before prepar-
forcement is provided by a
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