ASTM C719-93(1998)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C 719 – 93 (Reapproved 1998)
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope amount of joint movement; and ( d) alternate compression and
extension of the joint at high and low temperatures, respec-
1.1 This test method is an accelerated laboratory procedure
tively, under specified conditions described herein.
for evaluating the performance of a building sealant in a test
4.2 The effects of the test shall be evaluated by visual
configuration that is subjected to water immersion, cyclic
inspectionforcohesiveandadhesivefailures,sealantdeforma-
movement, and temperature change.
tion, and bubble formation within the sealant.
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
4.3 This test method is applicable to any joint movement.
as the standard. The values in parentheses are for information
The most common test movements are 612.5 and 625% as
only.
used in the examples.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 The failure of a building sealant in an active joint is
priate safety and health practices and determine the applica-
usually manifested by cohesive failure in the sealant or
bility of regulatory limitations prior to use.
adhesive failure between the sealant and the substrate, or both.
2. Referenced Documents The method described in this test method relates only to the
performance of the sealant when properly installed with
2.1 ASTM Standards:
recommended primers, and does not evaluate sealant failures
C33 Specification for Concrete Aggregates
caused by improper joint design, excessive joint movement,
C109 Test Method for Compressive Strength of Hydraulic
improper application practices, and other factors known to
CementMortars(Using2-in.or50-mmCubeSpecimens)
cause sealant failure in buildings and building areas.
C150 Specification for Portland Cement
C717 Terminology of Building Seals and Sealants
6. Apparatus
3. Terminology 6.1 Compression-Extension Machine, designed to auto-
maticallycompressthejointwidthofthetestspecimenfrom ⁄2
3.1 Definitions—For definitions of terms used in this test
in. (12.7 mm) to the minimum dimension desired (Table 1,
method, refer to Terminology C717.
Column C) and extend the specimen from ⁄2 in. to the
4. Summary of Test Method maximum extension desired (Table 1, Column E) at a constant
rateof ⁄8in./h(3.2mm/h).Themachineshallbeequippedwith
4.1 This test method consists of subjecting standard joint
grips of sufficient strength to withstand, without bending, the
specimens to a series of treatments as follows: ( a) immersion
resistance of high tensile strength sealants (see Figs. 1-3).
inwaterforsevendays;(b)exposureinanovenforsevendays
6.2 Cold Box or Chamber,maintainedat−15 63°F(−26.1
while under compression; ( c) automatic compression and
6 1.7°C).
extension cycling at room temperature at a specified rate and
6.3 Forced-Draft Oven, controlled at 158 6 3.6°F (70 6
2°C).
6.4 C-clamps, or other device for maintaining the specimen
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on
under compression.
Adhesion.
6.5 Spacer Blocks.
Current edition approved Nov. 15, 1993. Published January 1994. Originally
published as C719–72. Last previous edition C719–92.
This test method is also known as the Hockman Cycle in recognition ofArthur
Hockman who originated the method at the National Bureau of Standards.
3 7
Supporting data are available from ASTM Headquarters. Request RR: C24- Series 520 Sealing Compound Tester, manufactured by Applied Test Systems
1013. Inc.,348NewCastleRd.,Butler,PA16001,andadurabilitytestermanufacturedby
Annual Book of ASTM Standards, Vol 04.02. Ambard, Inc., 269-11 81st Ave., New Hyde Park, NY 11040, have been found
Annual Book of ASTM Standards, Vol 04.01. suitable for this purpose (Fig. 1(a)). For extension of the joint at cold temperature,
Annual Book of ASTM Standards, Vol 04.07. the machine may be designed for extension only (Fig. 3).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 719 – 93 (1998)
TABLE 1 Examples of Dimensions in Compression and
touching it) in distilled or deionized water and allow it to air
Extension
dry.Thefloatglassrequiresreinforcementtosurvivetherigors
Dimension
of the subsequent testing procedures. This must be done prior
Class C—Width of Joint in E—Width of Joint in
to the compression-extension cycling performed in 9.4. Rein-
Compression, in. (mm) Extension, in. (mm)
7 9
forcement is provided by adhering 3 by 1 by ⁄4 in. (76.2 by
12.5 ⁄16 (11.1) ⁄16 (14.3)
3 5
25 ⁄8 (9.5) ⁄8 (15.9)
25.4 by 6.4 mm) aluminum plates to the two outside surfaces
of the formed test specimen. Any adhesive may be used.
Commercially available two part epoxies have been found
6.6 Room or Chamber,maintainedatstandardconditionsof
suitable. Although the time of reinforcement is not critical,
73.4 6 3.6°F (23 6 2°C), 50 6 5% relative humidity.
application of the aluminum plates to the glass before prepar-
ing the test specimens has been found convenient.
7. Test Specimens
7.1.3 Aluminum—Thealuminumplatesshallbe3by1by ⁄4
7.1 The standard substrate used in the test shall be portland
in. (76.2 by 25.4 by 6.4 mm) aluminum alloy, 6063-T5, or
cement mortar, float glass, and aluminum alloy.
6061-T6 with anodizing process AA-M10C22A31. Prior to
use, the aluminum (and other metallic substrates, when speci-
NOTE 1—When requested, only one or two of the standard materials
fied) shall be cleaned as specified for float glass (7.1.2) (Notes
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 2 and 3).
addition to the standard substrate for test with the sealant sample.
NOTE 2—Methyl ethyl ketone and similar solvents are both toxic and
7.1.1 Mortar Block—Preparecementmortarblocks,each3
flammable and should be handled with caution in a well ventilated hood.
by 1 by 1 in. (75 by 25 by 25 mm) in size, using one part of
NOTE 3—At the request of the sealant producer, the detergent cleaning
high early strength portland cement conforming to Type III of step shall be omitted.
Specification C150 to two parts by weight of clean uniformly
7.2 Primers—Where use of primer is recommended by the
graded, concrete fine aggregate (sand) conforming to Specifi-
sealant manufacturer, substrate materials shall be primed with
cationC33.Usesufficientwatertoproduceaflowof10065%
the recommended primer or primers.
when tested in accordance with the procedure for the determi-
7.3 Preparation of Test Specimens:
nation of consistency of cement mortar described in Test
7.3.1 Standard conditions of temperature and relative hu-
Method C109.After curing one day in moist air and six days
midity used throughout this test method are defined as 73.4 6
in saturated lime water at 73 6 3°F (23 6 2°C), prepare the
3.6°F (23 6 2°C) and 50 6 5%, respectively.
surfaceofoneface,1by3in.(25by75mm),ofeachblockby
7.3.2 Multicomponent Sealants—Prepare three test speci-
wet grinding either with a belt sander using No. 60 aluminum
mens for each substrate that is to be used in the test. After
carbide sanding belt or using an iron lap with No. 60 silicon
maintaining the unopened sample for at least 24 h at standard
carbide (or aluminum oxide) grain until the aggregate is
conditions, mix thoroughly for 5 min at least 250 g of base
uniformly exposed. Return blocks to saturated lime water
compound with the appropriate amount of curing agent.Apply
storage until needed.
1 1
a bead of sealant ⁄2 by ⁄2 by 2 in. (12.7 by 12.7 by 50.8 mm)
7.1.1.1 Blocks may be prepared and shipped to other loca-
between parallel 1 by 3-in. (25.4 by 76.2 mm) faces of similar
tions for use. The blocks may be shipped dry and shall be
blocks or plates (Fig. 5(a),Fig. 5(b), and Fig. 5(c)). Use
returned to lime water storage on arrival until needed.
appropriate spacer blocks to form the proper size of the bead.
7.1.1.2 Prior to use, wet grind the previously ground face to
Apply polyethylene adhesive tape or any other suitable inert
remove any laitance, rinse thoroughly under running tap water
release agent to the inside surfaces of the spacers to prevent
and dry the blocks overnight at 2
...