ASTM C321-2000(2005) Standard Test Method for Bond Strength of Chemical-Resistant Mortars《耐化学腐蚀灰浆粘结强度的标准试验方法》.pdf

1、Designation: C 321 00 (Reapproved 2005)Standard Test Method forBond Strength of Chemical-Resistant Mortars1This standard is issued under the fixed designation C 321; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last

2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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

3、 of the bondstrength between chemical-resistant mortars and chemical-resistant brick.1.2 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 an

4、d determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C 279 Specification for Chemical-Resistant Masonry UnitsC 287 Specification for Chemical-Resistant Sulfur MortarC 904 Terminology Relating to Chemical-Resistant Non-metallic MaterialsE4 P

5、ractices for Force Verification of Testing Machines3. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod, see Terminology C 904.4. Significance and Use4.1 This test offers a method of determining the bondstrength between chemical-resistant mortars and chemical-resistant brick

6、. 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

7、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

8、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

9、.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 Fixtur

10、e, 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 C 279.6. Temperature6.1 The standard temperature of the laboratory equipmentand materials shall be 73 6 4F (23 6

11、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 sha

12、ll be 25 to 50 % inexcess of the required amount to ensure a full joint. Place oneof 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 j

13、oint desired and theheight of the brick; for example, if a18-in. (3.2-mm) thick joint1This 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 approve

14、d April 1, 2005. Published April 2005. Originallyapproved in 1954. Last previous edition approved in 2000 as C 321 00.2For 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 t

15、o the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.is desired and the height of the brick laying flat is 338 in. (85.7mm), then the blocks should be 312 in. (88.9 mm) in height in

16、order 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 theFIG. 1 Guide for Marking BrickFIG. 2 Special Test FixtureC

17、 321 00 (2005)2required amount to ensure a full joint. Place 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

18、that has been squeezedfrom all sides of the joint. Remove the 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 h

19、andling the specimens.8.2 With sulfur mortars to be applied 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 C 287. Pour the molten mortar into the jointcavity provided by this assembly. Allo

20、w 15 min for the mortarto set before handling the specimens.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 previousl

21、y determined weightof the specimen. Cool the brick to 73 6 4F 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 po

22、ints for theload test in the special test fixture (see 12.1).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

23、 by the manufacturer of thematerials. If the proportions so 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 C 287.11. Conditioning Test Specimens11

24、.1 Condition the specimens, except those of sulfur andhydraulic 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 andtemp

25、erature may be varied to establish time-temperature-strength 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

26、 to avoid abuse,such as lifting the unit by the top brick, or 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.

27、 The marked contact points on the bottom surfaceof the top brick 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.12.2 With the cross-head movement of 0.20 to 0

28、.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 brick, and the relative areas involved. Th

29、is will indicatewhich is the greater, cohesion within the mortar or adhesionbetween the mortar and brick or within the brick.(a) Side View. (b) Rear View.FIG. 3 Apparatus for Preparation of Mortar Joint by CastingC 321 00 (2005)313. Calculation13.1 Calculate the bond strength as follows:A 5 L/Jwhere

30、:A = bond strength, psi (or MPa),L = maximum load applied, lbf (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

31、,and surface,14.1.3 Age of specimen at time of test,14.1.4 Average 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 Pre

32、cision and bias for this test method have not beenestablished.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 sha

33、ll berejected and the mean recalculated. If any value still differsfrom 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.1

34、6. Keywords16.1 adhesion; bond; bond strength; brick; chemical-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 expr

35、essly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revise

36、d, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may

37、attend. If you feel that your comments have not received a fair 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 State

38、s. Individual reprints (single or multiple copies) of this standard 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).FIG. 4 Cross-Brick Specimen Mounted on Special FixtureC 321 00 (2005)4