This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C579 − 18
Standard Test Methods for
Compressive Strength of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes1 This standard is issued under the fixed designation C579; the number immediately following the designation indicates the year of original adoption or, in the case of revis original revision, ion, the year of last revision. revision. A number in paren parenthese thesess indicates the year of last reappr reapproval. oval. A superscript 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. Sco Scope pe
2. Referenc Referenced ed Documents 2.1 ASTM Standards:2 C470/C470M Specification C470/C470M Specification for Molds for Forming Concrete Test Cylinders Vertically C904 Te C904 Terminol rminology ogy Relating to Chemica Chemical-Resist l-Resistant ant Nonme Nonme-tallic Materia Materials ls E4 Practices for Force Verification of Testing Machines E4 E177 Practice for Use of the Terms Precision and Bias in E177 ASTM Test Methods E691 Practic E691 Practicee for Condu Conducting cting an Interl Interlabora aboratory tory Study to Determine the Precision of a Test Method
1.1 Th 1.1 Thes esee tes testt me meth thod odss co cove verr th thee de deter termin minati ation on of th thee compressive compr essive streng strength th of chemica chemical-resi l-resistant stant mortar mortars, s, grou grouts, ts, monolithic surfacings, and polymer concretes. These materials may be based on resin, silicate, silica, or sulfur binders. 1.2 Test Method A outlines the testing procedure generally generally used for systems containing aggregate less than 0.0625 in. (1.6 mm)) in si mm size. ze. Test Me Meth thod od B co cove vers rs th thee tes testin ting g pr proc oced edur uree generally used for systems containing aggregate from 0.0625 to 0.4 in. (1.6 to 10 mm) in size. Test Method C is used for systems containing aggregate larger than 0.4 in. 1.3 These test methods provide two different different methods for controlling the testing rate. 1.4 The values stated in inch-poun inch-pound d units are to be regar regarded ded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standar standard d doe doess not purport purport to add addre ress ss all of the safet sa fetyy co conc ncer erns ns,, if an anyy, as asso socia ciate ted d wi with th its us use. e. It is th thee responsibility of the user of this standard to establish appro priate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This int intern ernati ationa onall sta standa ndard rd was dev develo eloped ped in acc accor or-dance with internationally recognized principles on standardizatio iza tion n es esta tabl blis ishe hed d in th thee De Decis cisio ion n on Pr Prin incip ciple less fo forr th thee Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology 3.1 Definitions— For For definitions of terms used in these test methods, see Terminology C904 Terminology C904.. 4. Signi Significanc ficancee and Use 4.1 The These se tes testt meth methods ods offer offer a mea means ns of det determ ermini ining ng the compressive compr essive streng strength th of chemica chemical-resis l-resistant tant mortar mortars, s, grou grouts, ts, monolithic monol ithic surfa surfacings, cings, and polym polymer er concr concretes. etes. 5. Appar Apparatus atus to
5.1 Equipment, capable of weighi weighing ng materials or specim specimens ens 60.3 % accuracy.
5.2 Specimen Molds: 5.2.1 Test Method A— These These molds shall be right cylinder 1 1 1 6 ⁄ 32 32 in. (25 6 0.8 mm) in diameter by 1 6 ⁄ 32 32 in. high. The mold mo ldss ma may y be co cons nstr truc ucted ted in an any y ma mann nner er th that at wi will ll all allow ow formation forma tion of a test specimen of the desired size. Typical Typical molds cons co nsist ist of a 11-in in.. th thick ick,, fla flatt pl plas astic tic sh sheet eet in wh whic ich h 11-in in.. diameter, diamete r, smooth-sided smooth-sided holes have been cut, and to the bottom of which which a 1 ⁄ 4-in -in.. (6(6-mm) mm) thi thick, ck, flat pla plastic stic she sheet et (wi (witho thout ut
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These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Rel Paint Relate ated d Coa Coatin tings, gs, Mat Materi erials als,, and Applicati Applications ons and are the dir direct ect responsibility of Subcommittee D01.46 Subcommittee D01.46 on Industrial Protective Coatings. Current edition approved July 1, 2018. Published November 2018. Originally approved in 1968. Last previous edition approved in 2012 as C579 – 01 (2012). DOI: 10.1520/C0579-18.
2
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C579 − 18
match chin ing g ho holes les)) is att attach ached ed by me mean anss of sc scre rews ws or bo bolts lts.. mat Alternately, the molds may consist of sections of round plastic tubing or pipe, 1-in. inside diameter and 1 in. long, having suffficie suf icient nt wall thi thickn ckness ess to be rig rigid id and ret retain ain dim dimens ension ional al 1 stability during the molding operation, and a ⁄ 4-in. thick, flat plastic sheet on which one open end of each section can be rested. With the latter style of mold, the tubing segment may be sealed with a material, such as caulking compound or stopcock grease. For most types of specimens it is satisfactory to simply
Practices E4.. The testing machine shall be equipped with two Practices E4 steel bearing blocks with hardened faces, one of which is a spherically spher ically seated block that will bear on the top bearin bearing g plate, and the other a plain rigid block that will support the bottom bearing plate. The diameter of the spherical bearing block shall be at least 75 % of the width of the specimen. The bearing faces shall not depart from a plane by more than 0.001 in. (0.025 mm) in any 6-in. (150-mm) diameter circle.
seal one end of the tubing segment with masking tape.
6. Test Specimens 6.1 Mak Makee all specimens specimens for a sin single gle determina determinatio tion n fro from m a single mix.
NOTE 1—For use with sulfur mortars an additional piece of flat plastic sheet at least 1 ⁄ 8 in. (3 mm) thick containing a 1 ⁄ 4-in. (6-mm) hole and a section of plastic tubing or pipe 1 in. (25 mm) in diameter by 1 in. high are required. They are used to form a pouring gate and reservoir in the preparation of sulfur mortar specimens.
5.2.2 Test M olds for the 2 in. (50 mm) cube Test Method B— Molds specimens shall be tight fitting and leakproof. The molds shall havee not more tha hav than n thr three ee cub cubee com compar partmen tments ts and shall be separ sep arab able le in into to no nott mo more re th than an th thre reee pa part rts. s. Th Thee pa part rtss of th thee molds, when assembled, shall be positively held together. The molds shall be made of materials not attacked by the product being tested. The sides of the molds shall be sufficiently rigid to pre preven ventt spr spread eading ing or war warpin ping. g. The interior interior fac faces es of the molds shall be manufactured to ensure plane surfaces with a permis per missib sible le var variati iation on of 0.002 0.0 02 2in. (0.05 05 mm) mm).. The dis distan tances ces 1 between opposite faces shall be 6 (0. ⁄ 16 16 in. (50 6 0.8 mm). The heig he ight ht of th thee mo mold lds, s, me meas asur ured ed sep separ arate ately ly fo forr ea each ch cu cube be 1 compartment, shall be 2 6 ⁄ 16 16 in. The angle between adjacent interior faces and between interior faces and top and bottom plan pl anes es of the mo mold ld sh shall all be 90 6 0.5° mea measur sured ed at poi points nts slightly removed from the intersection of the faces. 5.2.3 Test Method C— Molds Molds shall be right cylinders made of heavy gage metal or other rigid nonabsorbent material. The cylin cy linde derr di diame amete terr sh shall all be at lea least st fo four ur tim times es th thee no nomi mina nall maximum aggregate size in the mix. The minimum cylinder diameter shall be 2 in. (50 mm). The cylinder height shall be two times the diameter. The plane of the rim of the mold shall be at right angles to the axis within 0.5°. The mold shall be at right angles to the axis within 0.5°. The mold shall not vary from the prescribed diameter by more than 1 ⁄ 16 16 in. (1.5 mm) nor 1 from the prescribed height by more than ⁄ 8 in. (3 mm). Molds shall sh all be pr prov ovid ided ed wi with th a fla flatt ba base se pl plate ate with a me mean anss fo forr secur sec urin ing g it to th thee mo mold ld at a ri righ ghtt an angl glee to the ax axis is of th thee cylinder in the instance of reusable metal molds. For molds other than metal, a mechanically attached smooth flat metal or integrally integr ally molded flat bottom of the same material, as the sides shall be used. Single-use molds shall conform to Specification C470/C470M.. C470/C470M NOTE 2—The material from which the mold is constructed must be chemicall chemic ally y ine inert rt and hav havee ant antist istick ick pro proper perties ties.. Pol Polyet yethyl hylene ene,, polypropyle polypr opylene, ne, polyte polytetrafluo trafluorethyl rethylene, ene, and metal forms havin having g either a sintered coating of tetrafluoroethylene or a suitable release agent compatible with the mat materi erial al bei being ng tes tested ted are sat satisf isfacto actory ry.. Bec Becaus ausee of the their ir superior heat resistance, only trifluorochloroethylene and tetrafluoroethylene mold release agents should be used with sulfur materials.
5.3 The testing testing mach machine ine may be of any typ typee of suf suffficie icient nt capacity which will provide the rates of loading prescribed. It shall have been verified to have an accuracy of 1.0 %, or better, within twelve months of the time of use in accordance with
6.2 Test Method A— Prepare Prepare test specimens to be used in accorda acco rdance nce with Test Test Met Method hod A as des describ cribed ed in 6.5 6.5.. Test 1 spec sp ecim imen enss sh shal alll be ri righ ghtt cy cyli lind nder erss 1 + 1 ⁄ 32 32 , − ⁄ 16 16 in. 1 (25 + 0.8, − 1.6 mm) in diameter by 1 6 ⁄ 16 16 in. (25 6 1.6 mm) high. If the faces of the specimen are not flat, smooth, and normal to the cylinder axis, they may be sanded, ground, or machined to specification. Exercise care that the frictional heat developed during such operations does not damage the specimens. 6.3 Test Method B— Prepare Prepare test specimens to be used in accorda acco rdance nce wit with h Test Met Method hod B as des descri cribed bed in 6.5 6.5.. Test specimens shall be cubes with dimensions of 2 + 1 ⁄ 16, − 1 ⁄ 8 in. (50 (5 0 + 1. 1.5, 5, − 3. 3.0 0 mm mm). ). If th thee fa faces ces of th thee cu cube be ar aree no nott fla flat, t, smooth, and normal to each other, they may be sanded, ground, or machined to specification. Exercise care that the frictional heat developed during such operations does not damage the specimens. 6.4 Test Method C— Prepare Prepare test specimens to be used in accordance with Test Method C as described in 6.6 6.6.. 6.4.1 Do not test specimens if any individual individual diameter of a cylinder differs from any other diameter of the same cylinder by more than 2 %. 6.4.2 6.4 .2 Neither Neither end of com compre pressi ssive ve test spe specime cimens, ns, whe when n tested, shall depart from perpendicular to the axis by more than 0.5° (approximately equivalent to 1 ⁄ 8 in. in 12 in. (3 mm in 300 mm). Cap the ends compression test specimens not flat within 0.002 in.of(0.05 mm) in accordance withthat 6.6,,are 6.6 sawed or gro ground und.. Det Determ ermine ine the diam diamete eterr use used d for calc calculat ulating ing the cross-sectional area of the test specimen to the nearest 0.01 in. (0.2 (0 .25 5 mm mm)) by av aver erag agin ing g tw two o di diam amet eter erss me measu asure red d at ri righ ghtt angles to each other at about mid-height of the specimen. 6.5 Specimen Preparation for Test Methods A and B: 6.5.1 Resin, Silicate, Silicate, and Silica Materials— Materials— Mix a sufficient amount of the components in the proportions and in the manner specified by the manufacturer of the materials. Fill the molds one-half one-h alf full. Remov Removee any entrapped entrapped air by using a cutting and stabbing motion with a spatula or rounded-end rod. Fill the remain rem ainder der of the mol mold, d, wor workin king g dow down n int into o the pre previo viousl usly y placed portion. Upon completion of the filling operation, the tops of the specimens should extend slightly above the tops of the molds. molds. Whe When n the molds have bee been n fill filled, ed, strike off off the excess exc ess material, material, even with the top of the mold. Permit Permit the material to remain in the mold until it has set sufficiently to allow removal without danger of deformation or breakage.
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C579 − 18
6.5.1.1 Silicate Materials— Some silicates may require covering 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 shall be permitted. Record the method of treatment in 9.1.8.. 9.1.8 6.5.2 Sulfur Materials: 6.5.2.1 Sulfur Mortar Mortars— s— Slowly S lowly melt a minimum of 2 lb (900 g) of the material in a suitable container at a temperature of 265 to 290°F (130 to 145°C) with constant agitation. Stir to lift and blend the aggregate without beating air into the melt. Place the piece of plastic sheet containing the 1 ⁄ 4-in. (6-mm) roun ro und d ho hole le ov over er th thee op open en fa face ce of th thee mo mold ld wi with th th thee ho hole le centered on the face. On top of the piece of plastic sheet and surrounding the hole, place a section of plastic tubing or pipe 1 in in.. (2 (25 5 mm mm)) in diamet diameter er by 1 in in.. hi high gh.. Po Pour ur the mel melted ted material through the hole into the mold and continue to pour until the section of tubing or pipe is completely filled. The excess material material contained in the hole in the plastic sheet acts as a reservoir to compensate for shrinkage of the material during cooling. 6.5.2. 6.5 .2.2 2 Allo Allow w the specimen specimen to rem remain ain in the mold until it has completely solidified. Upon removal, file, grind, or sand the surface flush, removing the excess material remaining at the pouring gate. 6.5.2.3 Sulfur Concrete— Heat Heat and mix a sufficient amount of aggr aggregate egate components components and sulfur cement in the proportions proportions and in the manner specified by the manufacturer to a temperature of 265 to 290°F (130 to 145°C). Fill the molds one-half full. Rod 25 times using a rounded 5 ⁄ 8-in. (15-mm) diameter rod. Distribute the strokes uniformly over the cross section of the mold. Repeat with two additional portions allowing the rod to penetrate about 1 ⁄ 2 in. (12 mm) into the underlying layer. After consolidation, the tops of the specimens should extend slightly above the tops of the molds. Finish the top surface by striking off the excess material even with the top of the mold. Permit the material to remain in the mold until it has cooled sufficiently to allow removal without danger of deformation or breakage. 6.5.3 Number Number of Test Specim Specimens— ens— Pre Prepar paree six tes testt spe specicimens for each material formulation. 6.6 Spe Specim cimen en Pr Prep epar arat atio ion n for Test Met Metho hod d C— Prepare specimens in accordance with 6.5 with 6.5 with with the following additional considerations: 6.6.1 6.6 .1 Use of vib vibrat rators ors is gen genera erally lly not req requir uired ed for sulfur sulfur concrete but may be required for other materials using Test Meth Me thod od C. Th Thee ty type pe an and d me meth thod od of vi vibr brati ating ng wi will ll be as recommended by the manufacturer and shall be specified in the test report. 6.6.2 Filling and Capping for Cylindrical Resin, Silica, and Silicatee Specim Silicat Specimens— ens— The top layer may be filled to slightly below the top edge of the mold except for sulfur materials. For sulfur materials, fill slightly above the top edge and strike off flush with the top edge. The top surface of the specimen shall be finished as much as practicable to a plane perpendicular to the axis of the specimen. The flatness of the finished specimen shall be within 0.010 in. (0.25 mm). Specimens exceeding this
tolerance shall be machined flat or a capping compound shall be applied if the test load is to be applied to the surface. 6.6.2.1 6.6.2 .1 Cappin Capping, g, if used, shall be made as thin as practi practicable cable and shall be applied before removal of the polymer concrete from the molds. 6.6.2.2 6.6.2 .2 If a polymer paste paste or mortar is used for capping, capping, it is preferable prefe rable that the polymer used be the same as the one used to make the specimen. Fillers used may be the fine portion used in the polymer concrete or another mineral powder. 6.6.2. 6.6 .2.3 3 For capping capping in athe mold,mortar. a sui suitab table le cap cappin ping g of comcom pound may be made from polymer The surface thepolyme pol ymerr con concre crete te sha shall ll be wip wiped ed of offf afte afterr har harden dening ing,, and a polymer mortar or polymer paste with suitable fillers shall be deposited and pressed down uniformly to the top edge of the mold with a capping plate. In order to prevent the capping plate from fro m bon bondin ding g to the pas paste te or mor mortar tar,, the undersid undersidee of the capping plate shall be covered with a release agent. 6.6.2.4 6.6.2 .4 For capping after mold removal, stiff stiff polymer paste or mor mortar tar or a low low-me -meltin lting-p g-poin ointt allo alloy y for capping capping sha shall ll be used. use d. A sui suitab table le app appara aratus tus to main maintain tain parallel parallel end endss on the specimens shall be used. NOTE 3—Any capping compound to be used with polymer concrete should be tested to ascertain that its strength is high enough to prevent premature failure in the cap when testing in high compressive strength polymer concretes. Cap failure may result in substantially lower compressive strength results.
7. Condi Condition tioning ing 7.1 Resin and Silica Materials— Age Age the test specimens in airr at 73 6 4°F (2 ai (23 3 6 2°C) 2°C) fo forr a pe peri riod od of se seve ven n da days ys,, including the time in the mold before testing. 7.2 Silicate Materials— Follow the same procedure as given in 7.1,, the only exception being that the relative humidity of the in 7.1 surrounding air must be kept below 80 %. 7.3 Sulfur Materials— Age Age the test specimens in air at 73°F 6 4°F for at least 24 h including the time in the mold, before testing. 8. Pro Procedu cedure re 8.1 Measurement of Specimens: 8.1.1 Tes Testt Me Meth thod od A an and d Tes estt Me Meth thod od C— Immediately following follow ing the condi conditionin tioning g perio period, d, measure the diameter of all test specimens to the nearest 0.001 in. (0.0254 mm), using a micrometer. Make two measurements at right angles to each other at mid-height and record the diameter as the average of the two. 8.1.1. 8.1 .1.1 1 Immediate Immediately ly aft after er mea measur suring ing,, pro proceed ceed to test as described descri bed in in 8.2 8.2.. 8.1.2 Test Method B— Immediately Immediately following the conditioning period, measure the cross-sectional dimensions of all test specimens to the nearest 0.001 in. (25 µm) using a micrometer. Take two measur measurements ements for each dimens dimension ion at mid-h mid-height eight and perpendicular to the load axis and average them. 8.1.2. 8.1 .2.1 1 Immediate Immediately ly aft after er mea measur suring ing,, pro proceed ceed to test as described in described in 8.2 8.2.. 8.2 Compression Testing: 8.2.1 Compr Compression ession tests shall be performed performed at 73
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6
4°F.
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Place the bearing block, with 8.2.2 Placing the Specimen— Place its ha hard rden ened ed fa face ce up up,, on th thee ta tabl blee or pl plat aten en of th thee tes testin ting g machine directly under the spherically seated (upper) bearing block. Wipe clean the bearing faces of the upper and lower bearin bea ring g blo blocks cks and of the test specimen specimen and pla place ce the test specimen specime n on the lower bearing bearing block. As the spherically seated seated block is brought to bear on the specimen, rotate its movable portion gently by hand so that uniform seating is obtained. 8.2.3 Rate of Loading:
9.1.4 Cappin Capping g material and method, if used, 9.1.5 Specim Specimen en dimensions, dimensions, 9.1.6 9.1 .6 Des Descri criptio ption n of fai failur luree inc includ luding ing typ typee of fai failur lure, e, appearance of specimen, and whether aggregate was fractured, 9.1.7 Defect Defectss in specimens, 9.1.8 Condi Conditionin tioning g proce procedure, dure, 9.1.9 Test conditions (temperature (temperature and humid humidity), ity), 9.1.10 9.1.1 0 Loadin Loading g rate, 9.1.11 9.1.1 1 Maxim Maximum um load indicated by testing machine, and
8.2.3.1shock. Loa Load d Test Rate Ra teat I— Appl Ap ply thee lo th load ad co cont ntin inuo uous usly ly an and d without a rate ofy 6000 psi/min (41 MPa/min). Makee no adj Mak adjust ustmen mentt in the con contro trols ls of the testing machine machine while whi le a spe specim cimen en is rap rapidl idly y yie yieldin lding, g, imm immedia ediately tely bef before ore failure. 8.2.3.2 Load Rate II— Set Set the testing machine to a crosshead speed spe ed of 0.1 to 0.1 0.125 25 in./min in./min time timess the specimen specimen height height in inches inch es (0. (0.1 1 to 0.1 0.125 25 cm/m cm/min in time timess the specimen specimen hei height ght in centimetres) when the machine is running without load.
9.1.12 Indiv 9.1.12 Individual idual and averag averagee compr compressive essive strength strength values values.. 3 10. Pre Precisi cision on and Bias
NOTE 4—The above methods of controlling machine crosshead rate are not identi identical cal and may produce different different comp compressi ressive ve stren strength gth values values..
8.2.4 8.2. 4 Lo Load ad th thee te test st sp spec ecim imen en to fa failu ilure re an and d re reco cord rd th thee maximum load (W ). ). 8.3 Calculation: 8.3.1 Test Method A and Test Method C: 8.3.1.1 8.3.1 .1 Calculat Calculatee compr compressive essive strength(s) strength(s) as follow follows: s: S 5 ~ 4 W ! / ~ π 3 D 2 !
(1 )
where: S = compr compressive essive streng strength, th, psi (MPa) (MPa),, W = max maximu imum m load, load, lb (N) (N),, and D = dia diamete meterr meas measure ured d in in 8.1.1 8.1.1,, in. (mm). 8.3.2 Test Method B: 8.3.2.1 8.3.2 .1 Calculat Calculatee compr compressive essive strength(s) strength(s) as follow follows: s: S 5 ~ W ! / ~ L 1 3 L
2
!
(2 )
where: = compr compressive essive streng strength, th, psi (MPa) (MPa),, S W = max maximu imum m loa load, d, lb (N) (N),, and L1 and L2 = crosscross-section section dimensio dimensions ns of cube measured measured in 8.1.2,, in. (mm). 8.1.2 9. Repo Report rt 9.1 Repor Reportt the follow following ing information: information: 9.1.1 Complet Completee materia materiall identifi identification cation,, date, 9.1.2 Mixing ratio, ratio, 9.1.3 Use of Test Test Method A, Test Test Method B, or Test Test Method C, 9.1.3. 9.1 .3.1 1 Use of Load Rate I or II.
10.1 The pr 10.1 prec ecis isio ion n of th this is te test st me meth thod od is ba base sed d on an interlaboratory study of ASTM C579, Standard Test Methods for Com Compre pressi ssive ve Stre Strengt ngth h of Che Chemica mical-Re l-Resis sistant tant Mor Mortars tars,, Grouts, Monolithic Surfacings, and Polymer Concretes, conducted in 2017. Six facilities participated in this study. Each partici par ticipan pantt rep report orted ed thr three ee rep replica licate te test res result ults. s. Eve Every ry “tes “testt result” reported represents the average of six individual determinations. Except for the inclusion of just a single material type, Practice E691 Practice E691 was was followed for the design and analysis of thee da th data ta;; th thee de detai tails ls ar aree gi give ven n in AS ASTM TM Re Resea searc rch h Rep Repor ortt RR:D01-1188. 10.1.1 Repeatability (r)— The The difference between repetitive res result ultss obt obtain ained ed bytest themethod samee ope sam operato rator r same in a giv given en lab labora orator tory y applying the same with the apparatus under constant operating conditions on identical test material within short intervals intervals of time would in the long run, in the norma normall and correct cor rect ope operat ration ion of the test met method hod,, exc exceed eed the fol follow lowing ing values only in one case in 20. 10.1.1.1 10.1. 1.1 Repeatab Repeatability ility can be interp interpreted reted as the maximu maximum m differen dif ference ce between two result results, s, obtain obtained ed under repeatability repeatability conditions, that is accepted as plausible due to random causes under normal and correct operation of the test method. 10.1.1.2 10.1. 1.2 Repeatab Repeatability ility estimates are listed in Table in Table 1. 1. 10.1.2 Reproducib differ ferenc encee bet betwee ween n two Reproducibility ility (R)— The dif single and independent results obtained by different operators applying the same test method in different laboratories using different apparatus on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in 20. 10.1.2.1 10.1. 2.1 Reprod Reproducibili ucibility ty can be interp interpreted reted as the maximum difference between two results, obtained under reproducibility conditions, that is accepted as plausible due to random causes under normal and correct operation of the test method. 3
Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D01-1188. Contact ASTM Customer Service at
[email protected].
TABLE 1 Compression Method B (psi ) Material
Chemical Resistant Grout A
AverageA ¯ X
Repeatability Standard Deviation Sr
Reproducibility Standard Deviation SR
Repeatability Limit r
Reproducibility Limit R
12401
349
1650
978
4620
The average of the laboratories’ reported averages.
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C579 − 18
10.1.2.2 2.2 Repro Reproducib ducibility ility estimates are listed in Table 1. 1. 10.1. 10.1.3 10.1. 3 The above terms (repeatability (repeatability and repro reproducib ducibility) ility) are used as specified in Practice E177 E177.. 10.1.4 10.1. 4 Any judgment judgment in accord accordance ance with statements 10.1.1 statements 10.1.1 and 10.1.2 would normally have an approximate 95 % probability of being correct, however however the precision statistics obtained in this ILS must not be treated as exact mathematical quantities which are applicable to all circumstances and uses. The limited number of materials tested guarantees that there
10.3 If any strength value(s) value(s) differs differs from the mean by more than 15 %, the value farthest from the mean shall be rejected and the mean recalculated. If any value(s) still differs from the new mean by more than 15 %, the farthest value should again be rejected and the mean recalculated. If any value(s) remains 15 % from the mean, the test should be rerun.
will be times when differences greater than predicted by the ILS results will arise, sometimes with considerably greater or smaller frequency than the 95 % probability limit would imply. The repeatability limit and the reproducibility limit should be considered consid ered as gener general al guide guides, s, and the associ associated ated probability probability of 95 % as only a rough indicator of what can be expected.
10.5 The precision statement statement was determ determined ined through through statistical examination of 18 test results, from six facilities, on a single chemical resistant grout.
10.2 10. 2 Test spe specim cimens ens tha thatt are man manifes ifestly tly fau faulty lty sho should uld be rejected and not consid considered ered in determining determining the compr compressive essive strength.
10.4 Bias— At At the time of the study, there was no accepted reference material suitable for determining the bias for this test method, therefore no statement on bias is being made.
11. Keywords 11.1 brick 11.1 brick mor mortars tars;; chem chemicalical-resi resistan stant; t; comp compress ressive ive strength; streng th; machin machinery ery grou grouts; ts; monol monolithic ithic surfa surfacings; cings; polym polymer er concrete; resin materials; silicate materials; sulfur materials; tile grouts
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