1、Designation: C719 13C719 14Standard Test Method forAdhesion and Cohesion of Elastomeric Joint SealantsUnder Cyclic Movement (Hockman Cycle)1,2This standard is issued under the fixed designation C719; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 Thi
3、s test method is an accelerated laboratory procedure for evaluating the performance of a building sealant in a testconfiguration that is subjected to water immersion, cyclic movement, and temperature change.31.2 The values stated in inch-pound units are to be regarded as standard. The values given i
4、n parentheses are mathematicalconversions 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 responsibilityof the user of this standard to establish ap
5、propriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:4C33 Specification for Concrete AggregatesC109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Speci
6、mens)C150 Specification for Portland CementC717 Terminology of Building Seals and Sealants3. Terminology3.1 DefinitionsFor definitions of terms used in this test method, refer to Terminology C717.4. Summary of Test Method4.1 This test method consists of subjecting standard joint specimens to a serie
7、s of treatments as follows: (a) immersion in waterfor seven days; (b) exposure in an oven for seven days while under compression; (c) automatic compression and extension cyclingat room temperature at a specified rate and amount of joint movement; and (d) alternate compression and extension of the jo
8、intat high and low temperatures, respectively, under specified conditions described herein.4.2 The effects of the test shall be evaluated by visual inspection for cohesive and adhesive failures, sealant deformation, andbubble formation within the sealant.4.3 This test method is applicable to any joi
9、nt movement. The most common test movements are 612.5 and 625 % as usedin the examples.5. Significance and Use5.1 The failure of a building sealant in an active joint is usually manifested by cohesive failure in the sealant or adhesive failurebetween the sealant and the substrate, or both. The metho
10、d described in this test method relates only to the performance of the1 This test method is under the jurisdiction ofASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on Adhesion.Current edition approved June 15, 2013July 15, 2014. Published Ju
11、ly 2013August 2014. Originally approved in 1972. Last previous edition approved in 20102013 asC719 93C719 13.(2010). DOI: 10.1520/C0719-13.10.1520/C0719-14.2 This test method is also known as the Hockman Cycle in recognition of Arthur Hockman who originated the method at the National Bureau of Stand
12、ards.3 Supporting data are available from ASTM International Headquarters. Request RR:C24-1013.4 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document
13、 Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recom
14、mends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1sealant when p
15、roperly 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 andbuilding areas.6. Apparatus6.1 Compression-Extension Machine,5
16、designed to automatically compress the joint width of the test specimen from 0.500 in.(12.7 mm) to the minimum dimension desired (Table 1, Column C) and extend the specimen from 0.500 in. to the maximumextension desired (Table 1, Column E) at a constant rate of 18 in./h (3.2 mm/h). The machine shall
17、 be equipped with grips ofsufficient strength to withstand, without bending, the resistance of high tensile strength sealants (see Figs. 1-3).6.2 Cold Box or Chamber, maintained at 15 6 3F (26.1 6 1.7C).6.3 Forced-Draft Oven, controlled at 158 6 3.6F (70 6 2C).6.4 C-clamps, or other device for maint
18、aining the specimen under compression.6.5 Spacer Blocks.6.6 Room or Chamber, maintained at standard conditions of 73.4 6 3.6Fas noted in Terminology C717(23 6 2C), 50 6 5 %relative humidity7. Test Specimens7.1 The standard substrate used in the test shall be portland cement mortar, float glass, and
19、aluminum alloy.NOTE 1When 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.7.1.1 Mort
20、ar Block Prepare cement mortar blocks, each 3 by 1 by 1 in. (75 by 25 by 25 mm) in size, using one part of highearly strength portland cement conforming to Type III of Specification C150 to two parts by weight of clean uniformly graded,concrete fine aggregate (sand) conforming to Specification C33.
21、Use sufficient water to produce a flow of 100 6 5 % when testedin accordance with the procedure for the determination of consistency of cement mortar described in Test Method C109/C109M.After curing one day in moist air and six days in saturated lime water at 73 6 3F (23 6 2C), prepare the surface o
22、f one face,1 by 3 in. (25 by 75 mm), of each block by wet grinding either with a belt sander using No. 60 aluminum carbide sanding beltor using an iron lap with No. 60 silicon carbide (or aluminum oxide) grain until the aggregate is uniformly exposed. Return blocksto saturated lime water storage unt
23、il needed.7.1.1.1 Blocks may be prepared and shipped to other locations for use. The blocks may be shipped dry and shall be returnedto lime water storage on arrival until needed.7.1.1.2 Prior to use, wet grind the previously ground face to remove any laitance, rinse thoroughly under running tap wate
24、r anddry the blocks overnight at 220 to 230F (105 to 110C). Clean the blocks of film or powder by vigorous brushing with astiff-bristled fiber brush. Condition the blocks at standard conditions for not less than one day and not more than seven days.7.1.2 Float Glass Glass plates shall be 3 by 1 by 1
25、4 in. (76.2 by 25.4 by 6.4 mm) clear float glass. Prior to use, the glass shallbe cleaned by wiping the surface with methyl ethyl ketone or similar solvent. Then dip the surface in a detergent solution. Thisshould be a 0.04 % solution of an alcohol ethoxy sulfate.6 An alternative would be a 0.1 % so
26、lution of a clear hand dishwashingdetergent.7 These solutions should be made up in distilled or deionized water. Rinse the surface (without touching it) in distilled5 Series 520 Sealing Compound Tester, manufactured by Applied Test Systems Inc., 348 New Castle Rd., Butler, PA 16001, and a durability
27、 tester manufactured byAmbard, Inc., 269-11 81stAve., New Hyde Park, NY 11040, have been found suitable for this purpose (Fig. 1(a). For extension of the joint at cold temperature, the machinemay be designed for extension only (Fig. 3).The sole source of supply of the apparatus known to the committe
28、e at this time is Applied Test Systems Inc. and Ambard Inc. If you are aware of alternative suppliers,please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee1, which you may attend.6 Neod
29、ol 25-35, a registered trademark of Shell Oil Co., One Shell Plaza, Houston, TX 77002, has been found suitable for this purpose.7 Dawn, a registered trademark of Proctor (b) seven days at 100 6 3.6F (37.8 6 2C) and 95 % relative humidity; and (c) seven days at standard conditions(Note 4). Separate t
30、he spacer blocks from the sealant as soon as practical during the curing period without damaging the sealant.NOTE 4The producer may request conditions other than those specified in 8.2 for the curing period of single-component sealants provided they meetTest specimens:(a) Prepared specimen before pl
31、acement of sealant, (b) Sealant with spacers removed, (c) Sealant between mortar blocks, (d) Sealant in the compressed state duringheat treatment, (e) Sealant in the extended state.FIG. 5 Test Specimen for Class 25 and Class 12.5 SealantsC719 145the following requirements: (1) The curing period shal
32、l extend for 21 days; and (2) The temperature during the curing period shall not exceed 122F(50C).9. Procedure9.1 Immediately following the curing period allow the specimens to cool to standard temperature if higher temperature cureconditions were used. Remove spacers and proceed as follows:9.2 Imme
33、rse the specimens in distilled or deionized water for seven days.9.3 Following immersion, hand flex each specimen twice, about 60 to check the bond. If the bond is still firm, compress thespecimens to the minimum desired dimension such as given under Column C, Table 1 (Dimension C) for the class und
34、er test. Ac-clamp and spacer bars (Fig. 5(d) or other adequate device may be used for compression. Fig. 6 shows an apparatus that has beensuitable for the oven compression of the specimens. It is comprised of two steel members (X and Z) and bolts (W) that hold andcompress the test specimens. The mem
35、bers may be 3 in. high for convenience and sufficiently long to accommodate multiplespecimens. They should be lined with felt, cork, or other material to provide a cushioned surface. Two long rods (Y) of square crosssection (Dimension C) are used to control the compression of the specimens. Where su
36、bstrates of uneven dimensions are used,individual spacers may be required. Place the compressed specimens in the 158F (70C) oven for seven days.9.4 After the oven treatment, remove the clamps and allow the specimens to cool to standard temperature. Within 24 h ofremoval from the oven, place the spec
37、imens in the compression-extension machine. Subject the specimens to ten cycles of jointmovement at standard conditions, as follows: (a) compression from the original 12-in. (12.7 mm) width to Dimension C, followedby (b) extension to Dimension E, and (c) compression again to 12 in. The rate of compr
38、ession and extension shall be 18 in. (3.2mm)/h.9.5 At the completion of ten cycles, extend the width of the joint in the specimens by hand crank to Dimension E, insert spacerblocks, remove the specimens from the machine, and examine them for bond or cohesive failure Fig. 5(e). Remove any specimenssh
39、owing complete adhesive or cohesive separation at this stage.9.6 Compress the width of the joint in the remaining specimens to Dimension C with a c-clamp and spacers or other suitabledevice and, while compressed, place them in the oven for 16 to 20 h at 158 6 3.6F (70 6 2C).9.7 Remove the specimens
40、from the oven. Allow them to cool for 2 to 3 h with the clamps and spacers removed to achievestandard temperature. Place them in the extension machine within the cold box or chamber maintained at 15 6 3F (26.1 61.7C).With the specimen grips set at Dimension C wide and regardless of the amount of rec
41、overy of the sealant after compression,extend the joint width of the specimens to Dimension E at the rate of 18 in. (3.18 mm)/h, while they are being cooled down to15 6 3F (26.1 6 1.7C). On completion of the extension, insert blocks, remove the specimens, and allow them to warm for2 h with blocks in
42、 place to achieve standard temperature. Examine the specimens for adhesive or cohesive failure and deformation.9.8 Repeat the compression-extension cycles described in 9.6 and 9.7 for a total of ten cycles. If complete adhesive or cohesivefailure occurs before the tenth cycle, the test is considered
43、 complete.10. Report10.1 Report the following information:10.1.1 Name of the sealant producer, type of sealant and identifying number,10.1.2 Percentage of cyclic movement,10.1.3 Substrates used, and method of cleaning used on each substrate,10.1.4 Name and description of primers used, if any,NOTE 1U
44、se longer screw for concrete substrate.FIG. 6 Oven Compression ApparatusC719 14610.1.5 Nature of test effects observed, such as amount of adhesive or cohesive failure, deformation, bubbles, or othercharacteristics,10.1.6 Description of and reasons for any variations from the test procedure, and10.1.
45、7 Statement of time, temperature, and humidity used to achieve cure (describe the cure cycle).11. Precision and Bias11.1 Inadequate precision and bias data are presently available. The precision and bias of this test method is currentlyundergoing round-robin testing by members of Committee C24. Earl
46、ier round-robin testing of a similar procedure performed bymembers of the Adhesives and Sealants Council indicates the test method is capable of discriminating between a Class 12.5 anda Class 25 sealant.12. Keywords12.1 adhesion; cohesion; cyclic movement; elastomeric joint sealant; Hockman cycleAST
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