1、Designation:C71914Standard 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 case of revis
2、ion,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 This test method is an
3、 accelerated laboratory procedurefor evaluating the performance of a building sealant in a testconfiguration that is subjected to water immersion,cyclicmovement,and temperature change.31.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathema
4、ticalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health p
5、ractices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4C33 Specification for Concrete AggregatesC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C150 Specification for Port
6、land CementC717 Terminology of Building Seals and Sealants3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology C717.4.Summary of Test Method4.1 This test method consists of subjecting standard jointspecimens to a series of treatments as follows:(a)immersi
7、onin water for seven days;(b)exposure in an oven for seven dayswhile under compression;(c)automatic compression andextension cycling at room temperature at a specified rate andamount of joint movement;and(d)alternate compression andextension of the joint at high and low temperatures,respectively,und
8、er specified conditions described herein.4.2 The effects of the test shall be evaluated by visualinspection for cohesive and adhesive failures,sealantdeformation,and bubble formation within the sealant.4.3 This test method is applicable to any joint movement.The most common test movements are 612.5
9、and 625%asused in the examples.5.Significance and Use5.1 The failure of a building sealant in an active joint isusually manifested by cohesive failure in the sealant oradhesive failure between the sealant and the substrate,or both.The method described in this test method relates only to theperforman
10、ce of the sealant when properly installed withrecommended primers,and does not evaluate sealant failurescaused by improper joint design,excessive joint movement,improper application practices,and other factors known tocause sealant failure in buildings and building areas.6.Apparatus6.1 Compression-E
11、xtension Machine,5designed to automati-cally compress the joint width of the test specimen from 0.500in.(12.7 mm)to the minimum dimension desired(Table 1,1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C2
12、4.30 onAdhesion.Current edition approved July 15,2014.Published August 2014.Originallyapproved in 1972.Last previous edition approved in 2013 as C719 13.DOI:10.1520/C0719-14.2This test method is also known as the Hockman Cycle in recognition of ArthurHockman who originated the method at the National
13、 Bureau of Standards.3Supporting data are available from ASTM International Headquarters.RequestRR:C24-1013.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards
14、 Document Summary page onthe ASTM website.5Series 520 Sealing Compound Tester,manufactured by Applied Test SystemsInc.,348 New Castle Rd.,Butler,PA16001,and a durability tester manufactured byAmbard,Inc.,269-11 81st Ave.,New Hyde Park,NY 11040,have been foundsuitable for this purpose(Fig.1(a).For ex
15、tension of the joint at cold temperature,the machine may be designed for extension only(Fig.3).The sole source of supply of the apparatus known to the committee at this timeis Applied Test Systems Inc.and Ambard Inc.If you are aware of alternativesuppliers,please provide this information to ASTM Int
16、ernational Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee1,which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Column C)and extend the specimen from 0.500 in.to themaximum extension desired(Table 1,Column E)at a constantrate of18in./h(3.2 mm/h).The machine shall be equipped withgrips of sufficient strength to withstand,without bending,theresistance of h
