1、Designation: C 307 03 (Reapproved 2008)Standard Test Method forTensile Strength of Chemical-Resistant Mortar, Grouts, andMonolithic Surfacings1This standard is issued under the fixed designation C 307; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 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 Department of Defense.1. Scope1.1 This t
3、est 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
4、.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 concerns, if any, assoc
5、iated 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:2C 904 Terminology Relating to Chemical-Resistant Non-metal
6、lic MaterialsE4 Practices for Force Verification of Testing Machines3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, seeTerminology C 904.4. Significance and Use4.1 It is recognized that chemical-resistant mortars, grouts,and monolithic surfacings are not usuall
7、y under 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 capa
8、ble of weighingmaterials or specimens to 60.3 % accuracy.5.2 Specimen MoldsThe 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 dim
9、ensions 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
10、for 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
11、 mortar 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, t
12、he testing machine shall be of anytype sufficient to provide the required load and the rate ofcrosshead 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
13、 test specimens,shall be in accordance with Fig. 3.1This 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 June 1, 2008. Published July 200
14、8. Originallypublished in 1953. Last previous edition approved in 2003 as C 307 03.2For 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 pa
15、ge 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 are aware of alternativesuppliers, please provide this information to ASTM Hea
16、dquarters. Your commentswill receive careful consideration at a meeting of the responsible technicalcommittee, which you may attend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Test Specimens6.1 All specimens for a single deter
17、mination 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 thecorresponding proportions by weight shal
18、l 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 area shall be 73 6 4F (23 6 2C).Rec
19、ord the actual temperature.6.2.2 Sulfur MortarsThe 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:6.3.1 Assemble and lubricate the mold
20、 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 manufacturer of the materials. Fill the moldso
21、ne-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 extend slightly above the tops oft
22、he 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 MaterialsSome silicates may require cov
23、-ering 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 Conditioning Procedure.6.3.4 Sulfur
24、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 min while stirring gently withthe
25、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 the plate. Allow the plate, placed
26、 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 2C). If a longer or shortercondition
27、ing period is used, the time shall be reported.7.2 Sulfur MaterialsBefore 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 and thewidth at the waist of each tes
28、t 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 materials may be tested 24 h after prepar
29、ation.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).9. Calculations9.1 Tensile StrengthThe tensile strength is equal t
30、o thestress calculated at maximum load. It is calculated as follows:FIG. 1 Briquet Gang MoldFIG. 2 Briquet Specimens for Tensile Strength TestC 307 03 (2008)2S 5 P/bd (1)where:S = stress in the specimen at the waist, psi (MPa),P = load at the moment of crack or break, lbf (N),b = width at the waist
31、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 conditions (temperature and humidity)
32、,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 berejected and not considered in determining
33、 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 mean. If less thantwo-thirds of the
34、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 MachinesC 307 03 (2008)3ASTM International takes no position respecting the validity of any patent rights asserted in conne
35、ction 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 revision at any time by the responsi
36、ble 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. Your comments will receive careful co
37、nsideration 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 copyrighted by ASTM International, 100
38、 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).C 307 03 (2008)4
