1、Designation: C1384 12Standard Specification forAdmixtures for Masonry Mortars1This standard is issued under the fixed designation C1384; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parenth
2、eses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification pertains to admixtures for masonrymortars. Admixtures are substances other than SpecificationC270 prescribed materials of water, agg
3、regate, and cementi-tious materials that are used to improve one or more of therecognized desirable properties of conventional masonry mor-tar.1.2 This specification does not cover coloring pigments.NOTE 1Information on coloring pigments can be found in Specifica-tion C979.1.3 This specification doe
4、s not cover additives that areadded to the cementitious materials during the manufacture ofthe cementitious materials.1.4 Acceptance of an admixture is based on its performancein an admixed mortar. Acceptance of the admixed masonrymortar is based on attainment of performance either equivalentto that
5、 required for conventional mortar or improved perfor-mance of one or more indicated properties, while maintainingrequired performance levels for other properties.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.NOTE 2The tes
6、ting laboratory performing the test methods referencedin this specification should be evaluated in accordance with PracticeC1093.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC144 Specification for Aggregate for Masonry MortarC150 Specification for Portland CementC20
7、7 Specification for Hydrated Lime for Masonry Pur-posesC270 Specification for Mortar for Unit MasonryC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC595 Specificat
8、ion for Blended Hydraulic CementsC723 Practice for Chemical-Resistant Resin Grouts forBrick or TileC778 Specification for SandC780 Test Method for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonryC979 Specification for Pigments for Integrally Colored Con-cret
9、eC1072 Test Methods for Measurement of Masonry FlexuralBond StrengthC1093 Practice for Accreditation of Testing Agencies forMasonryC1152/C1152M Test Method for Acid-Soluble Chloride inMortar and ConcreteC1157 Performance Specification for Hydraulic CementC1218/C1218M Test Method for Water-Soluble Ch
10、loride inMortar and ConcreteC1329 Specification for Mortar CementC1403 Test Method for Rate of Water Absorption of Ma-sonry MortarsC1437 Test Method for Flow of Hydraulic Cement Mortar3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 admixed mortar, nmasonry mortar that deviates
11、from those combinations of materials recognized by Specifi-cation C270 in that it also contains an admixture.3.1.2 admixture, nsubstance other than the SpecificationC270 prescribed materials of water, aggregate, and cementi-tious materials that is added to a masonry mortar to modify oneor more prope
12、rties of the conventional masonry mortar.3.1.3 bond enhancer, nadmixture used to increase thebond strength between the masonry mortar and the masonryunit.1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonry and is the direct responsibility of Subc
13、om-mittee C12.03 on Specifications for Mortars.Current edition approved June 1, 2012. Published July 2012. Originally approvedin 1998. Last previous approved in 2006 as edition C1384 06a. DOI: 10.1520/C1384-12.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Custo
14、mer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, P
15、A 19428-2959. United States13.1.4 reference mortar, nmortar of the same compositionas an admixed mortar except that the reference mortar does notinclude the admixture and may contain a different amount ofwater to obtain an equivalent flow or penetration as theadmixed mortar.3.1.5 set accelerator, na
16、dmixture used to shorten the timeof setting of a masonry mortar.3.1.6 set retarder, nadmixture used to lengthen the time ofsetting of a masonry mortar.3.1.7 water repellent, nadmixture used to decrease therate of water absorption of the hardened masonry mortar.3.1.8 workability enhancer, nadmixture
17、used in a masonrymortar to increase the ease of being worked and used.3.1.8.1 DiscussionWorkability is a combination of severalproperties, including: plasticity, consistency, cohesion, adhe-sion, water retentivity, setting characteristics, and its capacityto remain satisfactory under the influence o
18、f masonry unitsuction and ambient environmental conditions. Many of theseproperties have defied exact laboratory measurement. Themason can best assess workability by observing the response ofthe mortar to the trowel and the masonry unit. For furtherdiscussion on workability, see the Appendix of Spec
19、ificationC270.4. Classification4.1 Admixtures are classified by their effect on the perfor-mance characteristics of conventional masonry mortars. Ad-mixed mortars are classified by their modified properties, ascompared to a reference mortar. The following classificationsare recognized:4.1.1 Bond Enh
20、ancer.4.1.2 Workability Enhancer.4.1.3 Set Accelerator.4.1.4 Set Retarder.4.1.5 Water Repellent.5. Materials5.1 CementsThe cement used in the evaluation of theadmixture shall conform to applicable requirements specifiedin 5.1.1-5.1.5.5.1.1 Cement, PortlandWhen the admixture is evaluatedin a mortar c
21、ontaining portland cement, the portland cementshall conform to the requirements for Type I, IA, II, IIA, III, orIIIA of Specification C150.5.1.2 Cement, Blended HydraulicWhen the admixture isevaluated in a mortar containing blended hydraulic cement, theblended hydraulic cement shall conform to the r
22、equirementsfor Type IS, IS-A, IP, IP-A, I(PM) or I(PM)-A of SpecificationC595.5.1.3 Cement, HydraulicWhen the admixture is evaluatedin a mortar containing a hydraulic cement, the hydrauliccement shall conform to the requirements for Type GU, HE,MS, HS, MH, or LH of Specification C1157.5.1.4 Cement,
23、MasonryWhen the admixture is evaluatedin a mortar containing a masonry cement, the masonry cementshall conform to the requirements of Specification C91.5.1.5 Cement, MortarWhen the admixture is evaluated ina mortar containing a mortar cement, the mortar cement shallconform to the requirements of Spe
24、cification C1329.5.2 LimeWhen the admixture is evaluated in a cement-lime mortar, the hydrated lime shall conform to SpecificationC207.5.3 SandThe fine aggregate used in the tests will varydependent on the test procedure.5.3.1 Sands used for soluble chloride, flexural bond strengthand rate of water
25、absorption tests shall be a blend of equal partsby weight of graded standard sand and standard 20-30 sandconforming with Specification C778.5.3.2 Sands used for compressive strength, water retention,determination of air content of plastic mortar, board life, andtime of setting tests shall conform to
26、 the requirements ofSpecification C144.6. Chemical Composition6.1 The admixture shall not react adversely with embeddedor attached materials common to masonry.NOTE 3Currently, there is no standard test method for determining thecorrosion potential of masonry mortars toward embedded and attachedmater
27、ials. Nonetheless, the admixture shall not be offered for sale if themanufacturer has evidence that the admixture does react adversely withembedded or attached materials common to masonry.6.2 At the maximum recommended dosage, the mortaradmixture shall add not more than 65 ppm (0.0065 %) water-solub
28、le chloride, or 90 ppm (0.0090 %) acid-soluble chlorideto the mortars overall chloride content as determined bytesting of the reference and admixed mortars in accordancewith 9.1.1.7. Physical Properties7.1 All modified masonry mortars shall comply with theproperty specification requirements of Speci
29、fication C270.Inaddition, the admixed mortars shall conform to all of thespecific classification requirements in Table 1 for which theadmixture is obtaining qualification. Unless more specimensare required by a specific test method, a minimum of threespecimens shall be tested and the results average
30、d. These resultaverages shall meet the requirements of this section.7.2 Admixture compliance tests shall be the responsibilityof the manufacturer of the admixture. These compliance testsshall be completed within the past five (5) years and prior toany admixture composition change.8. Mortar Types and
31、 Proportions8.1 Design the reference mortar to be a specific type ofcement/lime, mortar cement, or masonry cement mortar inconformance with the proportion specification of SpecificationC270 except that the aggregate ratio shall be fixed at threetimes the sum of the separate volumes of cementitious m
32、ate-rials. In addition, the aggregate shall meet the requirements in5.3.8.2 The corresponding admixed mortars shall have the samecomposition as the reference mortars but also shall include theadmixture, and the water content shall be adjusted to yield theC1384 122flow or penetration appropriate for
33、each test method. Theadmixture dosage rate, time of addition, and mixing sequenceshall follow the manufacturers recommendations.8.3 A complete set of tests shall be run for all applicablecement/lime, mortar cement, and masonry cement types forwhich the admixture is to be qualified.9. Test Methods9.1
34、 For all required tests, test both the reference mortar andthe admixed mortar in accordance with the following testmethods:9.1.1 Soluble Chloride ContentPrepare six mortar cubesin accordance with the specimen preparation section of TestMethod C1403 including the drying procedure, except thatmortar p
35、roportions shall be as specified in Section 8 andaggregates shall be as specified in 5.3. After 28 days of age,determine the water-soluble chloride content of three cubes, aspercent chloride by mass of mortar, in accordance with TestMethod C1218/C1218M except increase the sample size to 15g instead
36、of the 10 g specified in Test Method C1218/C1218M.Determine the acid-soluble chloride content of the other threecubes, as percent chloride by mass of mortar, in accordancewith Test Method C1152/C1152M except increase the samplesize to 15 g instead of the 10 g specified in Test MethodC1152/C1152M.9.1
37、.2 Compressive StrengthPrepare and test mortar inaccordance with Specification C270, except that mortar pro-portions shall be as specified in Section 8 and aggregates shallbe as specified in 5.3. Test three specimens at 7 days and threespecimens at 28 days.9.1.3 Water RetentionPrepare and test morta
38、r in accor-dance with Specification C270, except that mortar proportionsshall be as specified in Section 8 and aggregates shall be asspecified in 5.3.9.1.4 Air Content of Plastic MortarPrepare mortar anddetermine air content of the plastic mortar in accordance withSpecification C270 except that mort
39、ar proportions shall be asspecified in Section 8 and aggregates shall be as specified in5.3. Calculate the air content to the nearest 0.1 % as follows:D 5W11W21W31W41W51VW!W1P11W2P21W3P31W4P41W5P51VW(1)A 5 100 2WM4Dwhere:D = density of air-free mortar, g/cm3,W1= weight of portland cement, g,W2= weig
40、ht of hydrated lime, g,TABLE 1 Physical RequirementsABond Enhancer Workability Enhancer Set Accelerator Set Retarder Water RepellentCompressive strength,min % of reference:7 day 80 80 80 70 8028 day 80 80 80 80 80Water retention, min % ofreference: report 100 report report reportAir content of plast
41、icmortar, % report report report report reportBoard life, min % ofreference report 120 report 120 reportTime of settingB,allowable deviation fromreference, h: min:Initial: at least . . . . . . 1:00 earlier 1:00Clater . . .not more than 1:00 earlier nor 1:30later1:00 earlier nor 3:30later3:30 earlier
42、 8:00Clater1:00 earlier nor 1:30laterFinal: at least . . . . . . 1:00 earlier . . . . . .not more than 1:00 earlier nor 1:30later1:00 earlier nor 3:30later. . . 8:00Clater1:00 earlier nor 1:30laterFlexural bond strength,min % of reference 110 . . . . . . . . . . . .Rate of water absorptionmax % of r
43、eference 24h . . . . 50AThe values in the table include allowance for normal variation in test results. In addition to meeting the requirements in this table, all admixed mortars must meet theproperty requirements of Specification C270.BAll time of setting tests shall be performed at 23 3C (73.4 5.4
44、F), except those for set accelerators, which shall be performed at52C(413.6F) as specifiedin 9.1.5.CThe manufacturers maximum recommended dosage rate shall be used when testing the initial and final set times for a set retarder.C1384 123W3= weight of mortar cement or masonry cement, g,W4= weight of
45、sand, g,W5= weight of mortar admixture, g,Vw= mL of water used,P1= density of portland cement, g/cm3,P2= density of hydrated lime, g/cm3,P3= density of mortar cement or masonry cement, g/cm3,P4= density of sand, g/cm3,P5= density of mortar admixture, g/cm3,A = volume of air, %, andWM= weight of 400
46、mL of mortar, g.9.1.5 Board LifeTest mortar in accordance with TestMethod C780, Annex A2 or, alternately, Annex A3, except forthe modifications in this section. The mortar proportions shallbe as specified in Section 8 and aggregates shall be as specifiedin 5.3. Prepare the mortar in accordance with
47、the procedures ofTest Method C780, modifying those as appropriate when theadmixture is added to the mortar. Mix the mortar for 5 min,timing from when water and cementitious materials are com-bined or as recommended by the manufacturer. The mixer usedshall conform to that described in Practice C305,
48、or to thatdescribed in Practice C723, or shall be a paddle-type fieldmortar mixer.9.1.5.1 If Test Method C780, Annex A2 is used, prepare themortar to have an initial penetration of 60 6 5 mm. Measurethe initial penetration within 2 min from the completion of themixing. Record the initial penetration
49、 as P0and the time of thismeasurement as T0. Test the sample using the disturbed sampleprocedure and measure the penetration at 15-min intervals untilthe penetration is less than 70 % of P0. Record as Tftheinterpolated time at which the penetration equals 70 % of P0.Board life is defined as (Tf T0), in minutes.9.1.5.2 If Test Method C780, Annex A3 is used, prepare themortar to have an initial penetration resistance (P0) of either0.94 6 0.05 psi or 1.24 6 0.05 psi as specified in the AnnexA3. Board life is defined as Tfas specified in the Ann
