1、Designation: C321 00 (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 re
2、vision. 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 Department of Defense.1. Scope1.1 This test method covers the determination of
3、 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
4、 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 Docu
5、ments2.1 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 definit
6、ions 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
7、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
8、% 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 o
9、f 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, mech
10、anically, 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 Mor
11、tar 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 beprepare
12、d.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 tes
13、t 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 ap
14、proved 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.Cop
15、yright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1of 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
16、the thickness of the mortar joint desired and theheight of the brick; for example, if a18-in. (3.2-mm) thick jointis desired and the height of the brick laying flat is 338 in. (85.7FIG. 1 Guide for Marking BrickFIG. 2 Special Test FixtureC321 00 (2012)2mm), then the blocks should be 312 in. (88.9 mm
17、) 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 joint. Plac
18、e the second brickon top of the bottom brick as shown in Fig. 3. Compress the topbrick until its ends are firmly against the side blocks. At thesame time, align the two brick-mortar contacts as parallelsurfaces. Strike off the excess mortar that has been squeezedfrom all sides of the joint. Remove t
19、he blocks, taking care notto disturb the joint area. Normally, with chemical-resistantmortars, the joint thickness does not exceed18 in. Allow themortar to set for a minimum of 24 h or longer if recommendedby the mortar manufacturer before handling the specimens.8.2 With sulfur mortars to be applied
20、 by casting, mount thebrick in a special jig as shown in Fig. 3. Mask any open pointsto prevent leakage. Prepare sulfur mortar in accordance withSpecification C287. Pour the molten mortar into the jointcavity provided by this assembly. Allow 15 min for the mortarto set before handling the specimens.
21、9. Conditioning Brick9.1 DryingDry the test brick in a ventilated oven at 230 to239F (110 to 115C) for not less than 24 h and until twosuccessive weighings at intervals of 2 h show an increment ofnot greater than 0.2 % of the last previously determined weightof the specimen. Cool the brick to 73 6 4
22、F before applyingthe mortar. (Note 1) Mark the brick as shown in Fig. 1,toensure that the crossed bricks will be at right angles to eachother and centered one on the other when the specimen isassembled. At the same time, mark the contact points for theload test in the special test fixture (see 12.1)
23、.NOTE 1Brick to be used with hydraulic cements shall not be dried.10. Preparation of Mortar10.1 For mortars to be applied by troweling, prepare a 1200to 1500-g sample of mortar, mixing it in the proper proportionsand in the manner specified by the manufacturer of thematerials. If the proportions so
24、specified are by volume, weighthe materials and report the corresponding proportions byweight.10.2 For sulfur mortars to be applied by casting, preparesamples in accordance with 7.1.1 of Specification C287.11. Conditioning Test Specimens11.1 Condition the specimens, except those of sulfur andhydraul
25、ic cement mortars, for seven days at 73 6 4F (23 62C). Other conditioning temperatures are acceptable, pro-vided they are reported with the test data. In the case of sulfurmortars, test the samples after 48 h. The conditioning time andtemperature may be varied to establish time-temperature-strength
26、relationship or to conform with intended service. Storespecimens made with hydraulic cement mortars for 14 days ina moist cabinet at 73 6 4F (23 6 2C) and at a relativehumidity of not less than 90 %.11.2 Take care in handling the specimens to avoid abuse,such as lifting the unit by the top brick, or
27、 stacking specimensone on another.12. Procedure12.1 Mount the test specimen in the special test fixture asshown in Fig. 2 and Fig. 4. Place the specimen on the supportpoints of the bottom head in such a manner that the specimenis balanced. The marked contact points on the bottom surfaceof the top br
28、ick must match the support points of the bottomtest head. Position the apparatus to match the contact points ofthe top head with the marked contact points on the top surfaceof the bottom brick.(a) Side View. (b) Rear View.FIG. 3 Apparatus for Preparation of Mortar Joint by CastingC321 00 (2012)312.2
29、 With the cross-head movement of 0.20 to 0.25 in./min(5 to 6.4 mm/min) when the machine is running without load,apply load until failure and record the maximum load applied.12.3 Inspect the joint after testing and note whether thefailure was in the mortar, between the mortar and the brick, orin the
30、brick, and the relative areas involved. This will indicatewhich is the greater, cohesion within the mortar or adhesionbetween the mortar and brick or within the brick.13. Calculation13.1 Calculate the bond strength as follows:A 5 L/Jwhere:A = bond strength, psi (or MPa),L = maximum load applied, lbf
31、 (or N), andJ = area of joint, in.2(or mm2).14. Report14.1 The report shall include the following:14.1.1 Identification of mortar tested and the proportions ofthe mortar by weight,14.1.2 Identification of brick used, including brand, type,and surface,14.1.3 Age of specimen at time of test,14.1.4 Ave
32、rage bond strength,14.1.5 Standard deviation,14.1.6 Number of specimens tested,14.1.7 Any variation from the standard procedure, and14.1.8 Type of failure, that is, cohesive, adhesive, or failureof the brick.15. Precision and Bias15.1 Precision and bias for this test method have not beenestablished.
33、15.2 Test specimens that are manifestly faulty should berejected and not considered in determining the bond strength ofthe mortar.15.3 If any bond strength value differs from the mean bymore than 15 %, the farthest value from the mean shall berejected and the mean recalculated. If any value still di
34、ffersfrom the new mean by more than 15 %, the farthest value shallagain be rejected and the mean recalculated. If any valueremains 15 % from the mean, the test shall be rerun.15.4 If less than four values remain, the test shall be rerun.16. Keywords16.1 adhesion; bond; bond strength; brick; chemical
35、-resistant brick; chemical-resistant mortar; cohesion; mortarASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such p
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38、r hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this sta
39、ndard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 4 Cross-Brick Specimen Mounted on Special FixtureC321 00 (2012)4
