1、Designation: C307 03 (Reapproved 2012)C307 18Standard 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, i
2、n 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. Scope
3、1.1 This test method covers the determination of tensile strength of cured chemical-resistant materials in the form of moldedbriquets. These materials include mortars, brick and tile grouts, machinery grouts, and monolithic surfacings. These materials shallbe based on resin, silicate, silica, or sul
4、fur binders.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concern
5、s, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance
6、 with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standar
7、ds:2C904 Terminology Relating to Chemical-Resistant Nonmetallic MaterialsE4 Practices for Force Verification of Testing MachinesE177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3
8、. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, see Terminology C904.4. Significance and Use4.1 It is recognized that chemical-resistant mortars, grouts, and monolithic surfacings are not usually under tension when inservice; however, such data are useful for pu
9、rposes of determining the rate of cure and other properties.4.2 This test method is not recommended for mortars, grouts, and monolithic surfacings containing aggregate greater than 14in.5. Apparatus5.1 Weighing Equipment, shall be capable of weighing materials or specimens to 60.3 % accuracy.5.2 Spe
10、cimen MoldsThe molds for making briquet test specimens shall be sufficiently rigid to prevent deformation duringmolding and shall be made of corrosion-resistant material. Gang molds, when used, shall be of the type shown in Fig. 1. The1 This test method is under the jurisdiction of ASTM Committee D0
11、1 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Aug. 1, 2012July 1, 2018. Published September 2012November 2018. Originally published in 1953. Last previous edition approved
12、 in 20082012as C307 03 (2008).(2012). DOI: 10.1520/C0307-03R12.10.1520/C0307-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page o
13、n the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that user
14、s consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1dimensions of the briquet mol
15、ds shall be the width of the mold, between inside faces, at waist line of briquet, 1 in. The width andthe depth of the briquet mold at the waist line shall be 1 in. 6 0.02in. (25mm 6 0.5mm). The molds shall conform to thedimensional requirements shown in Fig. 2.5.3 Equipment for Mixing Materials, sh
16、all consist of a container of suitable size, preferably corrosion resistant, and a strong,sturdy spatula, trowel, or mechanical mixer.5.4 The following additional equipment is required for sulfur mortars.5.4.1 Melting Chamber, of sufficient volume and heat capacity to melt the mortar sample and main
17、tain the temperature of themelt between 260 and 290F (127 and 143C).35.4.2 Laboratory Mixer, of such a type and speed to be capable of lifting the aggregate without beating air into the melt.5.4.3 Ladle, of sufficient capacity to completely pour one briquet.5.5 Testing Machine, the testing machine s
18、hall be of any type sufficient to provide the required load and the rate of crossheadmovement prescribed. It shall have been verified to have an accuracy of 1.0 % or better within 12 months of the time of use inaccordance with Practices E4.5.6 Tension Clips, for holding the tension test specimens, s
19、hall be in accordance with Fig. 3.6. Test Specimens6.1 All specimens for a single determination shall be made from a single mix containing sufficient amounts of the componentsin the proportions and in the manner specified by the manufacturer of the materials. If the proportions so specified are by v
20、olume,the constituents shall be weighed and the corresponding proportions by weight shall be reported.6.1.1 Number of SpecimensPrepare a minimum of six briquet specimens for each material tested.6.2 Temperature:6.2.1 Resin, Silicate, and Silica MaterialsThe standard temperature of the materials, mol
21、ds apparatus, and the ambienttemperature of the mixing area shall be 73 6 4F (23 6 2C). Record the actual temperature.6.2.2 Sulfur MortarsThe material shall be maintained at 275 6 15F (135 6 8C). The temperature of the molds and theambient temperature of the mixing area shall be 73 6 4F (23 6 2C). R
22、ecord the actual temperature.3 The 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., 1565Broadway Ave., Hermitage, PA 16148. If you are aware of alternative suppliers, please provide this information t
23、o ASTM Headquarters. Your comments will receive carefulconsideration at a meeting of the responsible technical committee,1 which you may attend.FIG. 1 Briquet Gang MoldFIG. 2 Briquet Specimens for Tensile Strength TestC307 1826.3 Molding Test Specimens:6.3.1 Assemble and lubricate the mold by applyi
24、ng a thin film of an appropriate mold release or lubricant like silicone stop-cockgrease or petroleum jelly.6.3.2 Resin, Silicate, and Silica MaterialsMix a sufficient amount of the components in the proportions and in the mannerspecified by the manufacturer of the materials. Fill the molds one-half
25、 full. Remove any entrapped air by using a cutting andstabbing motion with a spatula or rounded-end rod. Fill the remainder of the mold, working down into the previously placedportion. Upon completion of the filling operations, the tops of the specimens should extend slightly above the tops of the m
26、olds.When the molds have been filled, strike off the excess material so that it is even with the top of the mold. Permit the material toremain in the mold until it has set sufficiently to allow removal without danger of deformation or breakage.6.3.3 Silicate MaterialsSome silicates may require cover
27、ing during the curing period. After removal from the molds,acid-treat the specimens, if required, in accordance with the recommendations given by the manufacturer. No other treatment shallbe permitted. Record the method of treatment in the report section under Conditioning Procedure.6.3.4 Sulfur Mor
28、tars:6.3.4.1 Assemble the mold in 6.3.1. However, cover the waist 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 the melt chamber in not more than 1 h. Hold the temperature of the meltat 275 6 15F for at least 15 min while stirring gently with the
29、 laboratory mixer. (The mixer speed should be controlled so thatit is sufficient to lift the aggregate without beating air into the melt.)6.3.4.3 Using the ladle, pour the molten sulfur mortar into both sides of the mold and puddle it to completely fill the space underthe plate. Allow the plate, pla
30、ced across the center of the mold, to remain in place for at least 15 min after the briquet has beenpoured.7. Conditioning7.1 Resin, Silicate, and Silica MaterialsAge the test specimens for a period of seven days, including the cure period in themold, at 73 6 4F (23 6 2C). If a longer or shorter con
31、ditioning period is used, the time shall be reported.7.2 Sulfur MaterialsBefore testing, condition the specimens at 73 6 4F. The time between casting the specimen and testingthe specimen shall be at least 24 h.1 in. = 25.4 mmFIG. 3 Clips for Briquet Towing MachinesC307 1838. Procedure8.1 Measurement
32、 of SpecimensMeasure the depth and the width at the waist of each test specimen to the nearest 6 0.02 in.(0.5 mm).8.2 Test the specimens on the seventh day after preparation. If desired, the conditioning time may be lengthened or shortenedto establish the age-strength relationship. Report the age of
33、 the specimens.8.2.1 Sulfur materials may be tested 24 h after preparation.8.3 Center the specimens carefully in the clips of the testing machine. Pull the specimens at a speed of 0.20 to 0.25 in./min (5to 6.4 mm/min) of crosshead movement (speed of movement when the machine is running without a loa
34、d).9. Calculations9.1 Tensile StrengthThe tensile strength is equal to the stress calculated at maximum load. It is calculated as follows:S 5P/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 of the briquet tested
35、, 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),10.1.5 Total duratio
36、n of conditioning in days, and10.1.6 Individual and averaged results of tensile strength.11. Precision and Bias411.1 Precision and bias for The precision of this test method have not been established.is based on an interlaboratory study ofASTM C307, Standard Test Method for Tensile Strength of Chemi
37、cal-Resistant Mortar, Grouts, and Monolithic Surfacings,conducted in 2017. Six facilities participated in this study. Each participant was instructed to report three replicate test results.Every “test result” reported represents the average of six individual determinations. Except for the inclusion
38、of just a singlematerial type, Practice E691 was followed for the design and analysis of the data; the details are given in ASTM Research ReportRR:D01-1185.11.1.1 Repeatability (r)The difference between repetitive results obtained by the same operator in a given laboratory applyingthe same test meth
39、od with the same apparatus under constant operating conditions on identical test material within short intervalsof time would in the long run, in the normal and correct operation of the test method, exceed the following values only in one casein 20.11.1.1.1 Repeatability can be interpreted as the ma
40、ximum difference between two results, obtained under repeatabilityconditions, that is accepted as plausible due to random causes under normal and correct operation of the test method.11.1.1.2 Repeatability estimates are listed in Table 1.11.1.2 Reproducibility (R)The difference between two single an
41、d independent results obtained by different operators applyingthe same test method in different laboratories using different apparatus on identical test material would, in the long run, in thenormal and correct operation of the test method, exceed the following values only in one case in 20.4 Suppor
42、ting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D01-1185. Contact ASTM CustomerService at serviceastm.org.TABLE 1 Tensile Strength (psi)Material AverageAXRepeatabilityStandardDeviationSrReproducibilityStandardDeviationSRRepeatabilityL
43、imitrReproducibilityLimitRChemicalResistantGrout2123 129 145 359 406A The average of the laboratories reported averages.C307 18411.1.2.1 Reproducibility can be interpreted as the maximum difference between two results, obtained under reproducibilityconditions, that is accepted as plausible due to ra
44、ndom causes under normal and correct operation of the test method.11.1.2.2 Reproducibility estimates are listed in Table 1.11.1.3 The above terms (repeatability and reproducibility) are used as specified in Practice E177.11.1.4 Any judgment in accordance with statements 11.1.1 and 11.1.2 would norma
45、lly have an approximate 95 % probabilityof being correct, however the precision statistics obtained in this ILS must not be treated as exact mathematical quantities whichare applicable to all circumstances and uses. The limited number of materials tested guarantees that there will be times whendiffe
46、rences greater than predicted by the ILS results will arise, sometimes with considerably greater or smaller frequency than the95 % probability limit would imply. The repeatability limit and the reproducibility limit should be considered as general guides,and the associated probability of 95 % as onl
47、y a rough indicator of what can be expected.11.2 Test specimens that are manifestly faulty should be rejected and not considered in determining the tensile strength.Jawbreaks should be rejected.11.3 If any strength value differs from the mean by more than 15 %, the farthest value from the mean shall
48、 be rejected and themeanmen recalculated. Repeat the process until all the tested values are within 15 % of the mean. If less than tested values arewithin two-thirds of the values remain, the test shall be rerun.11.4 BiasAt the time of the study, there was no accepted reference material suitable for
49、 determining the bias for this testmethod, therefore no statement on bias is being made.11.5 The precision statement was determined through statistical examination of 18 test results, from six facilities, on a single,chemical resistant grout material.12. Keywords12.1 chemical resistant; grout; monolithic surfacing; mortar; tensile strengthASTM 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
