ASTM_C_321_-_00_2012.pdf

Designation:C32100(Reapproved 2012)Standard Test Method forBond Strength of Chemical-Resistant Mortars1This standard is issued under the fixed designation C321;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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 This test method covers the determination of the bondstrength between chemical-resistant mortars and chemical-resistant brick.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions 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 problems,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C279 Specification for Chemical-Resistant Masonry UnitsC287 Specification for Chemical-Resistant Sulfur MortarC904 Terminology Relating to Chemical-Resistant Nonme-tallic MaterialsE4 Practices for Force Verification of Testing Machines3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,see Terminology C904.4.Significance and Use4.1 This test offers a method of determining the bondstrength between chemical-resistant mortars and chemical-resistant brick.The results obtained by this test method shouldbe used as a guide in,but not as the sole basis for,selection ofa chemical-resistant material for a particular application.Iffailure is within the brick,then the result reported shall bestated as a minimum bond strength and it shall be noted that thebrick broke.5.Apparatus5.1 Equipment,capable of weighing materials or specimensto 60.3%accuracy.5.2 Equipment for Mixing Materials,consisting of a con-tainer of suitable size,preferably made of corrosion-resistantmetal,or a porcelain enameled pan,and a strong,sturdy spatulaor trowel.5.3 Equipment for Melting Sulfur,consisting of a containerof suitable size,preferably made of corrosion-resistant metal,and a heater for melting the sulfur mortar.Also required is alaboratory mixer capable of operating at a speed sufficient tolift the aggregate but without beating air into the melt.5.4 Testing Machine,of the universal type,in which the loadis applied hydraulically,mechanically,or electromechanicallyat a constant but adjustable rate of crosshead movement.Themachine shall conform to Practices E4.5.5 Guide for Marking Brick,of the type shown in Fig.1.5.6 Special Test Fixture,consisting of two units of the typeshown in Fig.2.5.7 Apparatus for Preparation of Mortar Joint by Casting,of the type shown in Fig.3.5.8 Brick,as defined in 1.1.See Specification C279.6.Temperature6.1 The standard temperature of the laboratory equipmentand materials shall be 73 6 4F(23 6 2C).7.Number of Specimens7.1 A minimum of six crossed-brick test specimens shall beprepared.8.Preparation of Crossed-Brick Test Specimens8.1 With mortars designed for a trowel-type application,apply the mortar over the area on the brick that is marked forthe joint.The amount of mortar applied shall be 25 to 50%inexcess of the required amount to ensure a full joint.Place one1This test method is under the jurisdiction of ASTM Committee C03 onChemical-Resistant Nonmetallic Materials and is the direct responsibility ofSubcommittee C03.01 on Mortars and Carbon Brick.Current edition approved Aug.1,2012.Published September 2012.Originallyapproved in 1954.Last previous edition approved in 2005 as C321 00(2005).DOI:10.1520/C0321-00R12.2For 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 Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 of the brick,mortared side up,on a flat level surface.Thenplace two blocks on each side of the joint area of the bottombrick.The height of the blocks must be uniform and isdependent on the thickness of the mortar joint desired and theFIG.1 Guide for Marking BrickFIG.2 Special Test FixtureC321 00(2012)2 height of the brick;for example,if a18-in.(3.2-mm)thick jointis desired and the height of the brick laying flat is 338in.(85.7mm),then the blocks should be 312in.(88.9 mm)in height inorder to provide the desired joint thickness.It is suggested thatthe blocks be made of wood or rigid plastic.Mortar shall betrowelled onto the marked area of the second brick.Theamount of mortar applied shall be 10 to 25%in excess of therequired amount to ensure a full jo