1、Designation: C307 03 (Reapproved 2012)Standard Test Method forTensile Strength of Chemical-Resistant Mortar, Grouts, andMonolithic Surfacings1This standard is issued under the fixed designation C307; 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 Department of Defense.1. Scope1.1 This tes
3、t method covers the determination of tensilestrength of cured chemical-resistant materials in the form ofmolded briquets. These materials include mortars, brick andtile grouts, machinery grouts, and monolithic surfacings. Thesematerials shall be based on resin, silicate, silica, or sulfurbinders.1.2
4、 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 concerns, if any, associa
5、ted 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:2C904 Terminology Relating to Chemical-Resistant Nonme-tallic
6、 MaterialsE4 Practices for Force Verification of Testing Machines3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, seeTerminology C904.4. Significance and Use4.1 It is recognized that chemical-resistant mortars, grouts,and monolithic surfacings are not usually un
7、der tension whenin service; however, such data are useful for purposes ofdetermining the rate of cure and other properties.4.2 This test method is not recommended for mortars,grouts, and monolithic surfacings containing aggregate greaterthan14 in.5. Apparatus5.1 Weighing Equipment, shall be capable
8、of weighingmaterials or specimens to 60.3 % accuracy.5.2 Specimen Molds The molds for making briquet testspecimens shall be sufficiently rigid to prevent deformationduring molding and shall be made of corrosion-resistantmaterial. Gang molds, when used, shall be of the type shown inFig. 1. The dimens
9、ions of the briquet molds shall be the widthof the mold, between inside faces, at waist line of briquet, 1 in.The width and the depth of the briquet mold at the waist lineshall be 1 in. 6 0.02in. (25mm 6 0.5mm). The molds shallconform to the dimensional requirements shown in Fig. 2.5.3 Equipment for
10、 Mixing Materials , shall consist of acontainer of suitable size, preferably corrosion resistant, and astrong, sturdy spatula, trowel, or mechanical mixer.5.4 The following additional equipment is required forsulfur mortars.5.4.1 Melting Chamber, of sufficient volume and heat ca-pacity to melt the m
11、ortar sample and maintain the temperatureof the melt between 260 and 290F (127 and 143C).35.4.2 Laboratory Mixer, of such a type and speed to becapable of lifting the aggregate without beating air into themelt.5.4.3 Ladle, of sufficient capacity to completely pour onebriquet.5.5 Testing Machine, the
12、 testing machine shall be of anytype sufficient to provide the required load and the rate of1This test method is under the jurisdiction of ASTM Committee C03 onChemical-Resistant Nonmetallic Materialsand is the direct responsibility of Sub-committee C03.01 on Mortars and Carbon Brick.Current edition
13、 approved Aug. 1, 2012. Published September 2012. Originallypublished in 1953. Last previous edition approved in 2008 as C307 03 (2008).DOI: 10.1520/C0307-03R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book o
14、f ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of the Forney capping compound melting chamber,Model LA-0130, known to the committee at this time is Forney Industries, Inc.,1565 Broadway Ave., Hermitage, PA 16148. If you
15、are aware of alternativesuppliers, please provide this information to ASTM Headquarters. Your commentswill receive careful consideration at a meeting of the responsible technicalcommittee, which you may attend.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19
16、428-2959. United States1crosshead movement prescribed. It shall have been verified tohave an accuracy of 1.0 % or better within 12 months of thetime of use in accordance with Practices E4.5.6 Tension Clips, for holding the tension test specimens,shall be in accordance with Fig. 3.6. Test Specimens6.
17、1 All specimens for a single determination shall be madefrom a single mix containing sufficient amounts of the com-ponents in the proportions and in the manner specified by themanufacturer of the materials. If the proportions so specifiedare by volume, the constituents shall be weighed and thecorres
18、ponding proportions by weight shall be reported.6.1.1 Number of SpecimensPrepare a minimum of sixbriquet specimens for each material tested.6.2 Temperature:6.2.1 Resin, Silicate, and Silica MaterialsThe standardtemperature of the materials, molds apparatus, and the ambienttemperature of the mixing a
19、rea shall be 73 6 4F (23 6 2C).Record the actual temperature.6.2.2 Sulfur Mortars The material shall be maintained at275 6 15F (135 6 8C). The temperature of the molds andthe ambient temperature of the mixing area shall be 73 6 4F(23 6 2C). Record the actual temperature.6.3 Molding Test Specimens:6.
20、3.1 Assemble and lubricate the mold by applying a thinfilm of an appropriate mold release or lubricant like siliconestop-cock grease or petroleum jelly.6.3.2 Resin, Silicate, and Silica MaterialsMix a sufficientamount of the components in the proportions and in the mannerspecified by the manufacture
21、r of the materials. Fill the moldsone-half full. Remove any entrapped air by using a cutting andstabbing motion with a spatula or rounded-end rod. Fill theremainder of the mold, working down into the previouslyplaced portion. Upon completion of the filling operations, thetops of the specimens should
22、 extend slightly above the tops ofthe molds. When the molds have been filled, strike off theexcess material so that it is even with the top of the mold.Permit the material to remain in the mold until it has setsufficiently to allow removal without danger of deformation orbreakage.6.3.3 Silicate Mate
23、rialsSome silicates may require cover-ing during the curing period. After removal from the molds,acid-treat the specimens, if required, in accordance with therecommendations given by the manufacturer. No other treat-ment shall be permitted. Record the method of treatment in thereport section under C
24、onditioning Procedure.6.3.4 Sulfur Mortars:6.3.4.1 Assemble the mold in 6.3.1. However, cover thewaist of the mold with a small lubricated plate.6.3.4.2 Melt at least 2.2 lb (1.0 kg) of sulfur mortar in themelt chamber in not more than 1 h. Hold the temperature of themelt at 2756 15F for at least 15
25、 min while stirring gently withthe laboratory mixer. (The mixer speed should be controlled sothat it is sufficient to lift the aggregate without beating air intothe melt.)6.3.4.3 Using the ladle, pour the molten sulfur mortar intoboth sides of the mold and puddle it to completely fill the spaceunder
26、 the plate. Allow the plate, placed across the center of themold, to remain in place for at least 15 min after the briquet hasbeen poured.7. Conditioning7.1 Resin, Silicate, and Silica MaterialsAge the testspecimens for a period of seven days, including the cure periodin the mold, at 73 6 4F (23 6 2
27、C). If a longer or shorterconditioning period is used, the time shall be reported.7.2 Sulfur Materials Before testing, condition the speci-mens at 73 6 4F. The time between casting the specimen andtesting the specimen shall be at least 24 h.8. Procedure8.1 Measurement of SpecimensMeasure the depth a
28、nd thewidth at the waist of each test specimen to the nearest 6 0.02in. (0.5 mm).8.2 Test the specimens on the seventh day after preparation.If desired, the conditioning time may be lengthened or short-ened to establish the age-strength relationship. Report the ageof the specimens.8.2.1 Sulfur mater
29、ials may be tested 24 h after preparation.8.3 Center the specimens carefully in the clips of the testingmachine. Pull the specimens at a speed of 0.20 to 0.25 in./min(5 to 6.4 mm/min) of crosshead movement (speed of move-ment when the machine is running without a load).FIG. 1 Briquet Gang MoldFIG. 2
30、 Briquet Specimens for Tensile Strength TestC307 03 (2012)29. Calculations9.1 Tensile Strength The tensile strength is equal to thestress calculated at maximum load. It is calculated as follows:S 5 P/bd (1)where:S = stress in the specimen at the waist, psi (MPa),P = load at the moment of crack or br
31、eak, lbf (N),b = width at the waist of the briquet tested, in. (mm), andd = depth of briquet tested, in. (mm).10. Report10.1 The report shall include the following:10.1.1 Manufacturer, product trade name, and generic type,10.1.2 Mixing ratio, if applicable,10.1.3 Conditioning procedure,10.1.4 Test c
32、onditions (temperature and humidity),10.1.5 Total duration of conditioning in days, and10.1.6 Individual and averaged results of tensile strength.11. Precision and Bias11.1 Precision and bias for this test method have not beenestablished.11.2 Test specimens that are manifestly faulty should bereject
33、ed and not considered in determining the tensile strength.Jawbreaks should be rejected.11.3 If any strength value differs from the mean by morethan 15 %, the farthest value from the mean shall be rejectedand the mean recalculated. Repeat the process until all thetested values are within 15 % of the
34、mean. If less thantwo-thirds of the values remain, the test shall be rerun.12. Keywords12.1 chemical resistant; grout; monolithic surfacing; mor-tar; tensile strength1 in. = 25.4 mmFIG. 3 Clips for Briquet Towing MachinesC307 03 (2012)3ASTM International takes no position respecting the validity of
35、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 patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to r
36、evision at any time by the responsible technical committee and must be reviewed every five years andif not revised, 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. Yo
37、ur comments will receive careful consideration at a meeting of theresponsible technical committee, which you may 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 cop
38、yrighted 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 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C307 03 (2012)4
