1、Designation: C1384 18Standard 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/C979M.1.3 This specificati
4、on does 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 equivalentt
5、o that 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 2T
6、he testing laboratory performing the test methods referencedin this specification should be evaluated in accordance with PracticeC1093.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles
7、 for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C144 Specification for Aggregate for Masonry MortarC270 Specification for Mortar for Unit MasonryC3
8、05 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC723 Practice for Chemical-Resistant Resin Grouts forBrick or TileC780 Test Method for Preconstruction and Constructio
9、nEvaluation of Mortars for Plain and Reinforced UnitMasonryC979/C979M Specification for Pigments for Integrally Col-ored ConcreteC1072 Test Methods for Measurement of Masonry FlexuralBond StrengthC1093 Practice for Accreditation of Testing Agencies forMasonryC1152/C1152M Test Method for Acid-Soluble
10、 Chloride inMortar and ConcreteC1180 Terminology of Mortar and Grout for Unit MasonryC1218/C1218M Test Method for Water-Soluble Chloride inMortar and ConcreteC1403 Test Method for Rate of Water Absorption of Ma-sonry MortarsC1437 Test Method for Flow of Hydraulic Cement Mortar3. Terminology3.1 Termi
11、nology defined in Terminology C1180 shall applyfor this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 admixed mortar, nmasonry mortar that deviatesfrom those combinations of materials recognized by Specifi-cation C270 in that it also contains an admixture.1This specification
12、 is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-mittee C12.03 on Specifications for Mortars.Current edition approved June 1, 2018. Published August 2018. Originallyapproved in 1998. Last previous approved in 2017 as ed
13、ition C1384 17. DOI:10.1520/C1384-18.2For 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 page onthe ASTM website.*A Summary of Changes se
14、ction appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision
15、on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.2.2 admixture, nsubstance other than the SpecificationC270 prescribed materials of water, aggregate, and cementi-tious materia
16、ls that is added to a masonry mortar to modify oneor more properties of the conventional masonry mortar.3.2.3 bond enhancer, nadmixture used to increase thebond strength between the masonry mortar and the masonryunit.3.2.4 reference mortar, nmortar of the same compositionas an admixed mortar except
17、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.3.2.5 set accelerator, nadmixture used to shorten the timeof setting of a masonry mortar.3.2.6 set retarder, nadmixture used to lengthen
18、 the time ofsetting of a masonry mortar.3.2.7 water repellent, nadmixture used to decrease therate of water absorption of the hardened masonry mortar.3.2.8 workability enhancer, nadmixture used in a masonrymortar to increase the ease of being worked and used.3.2.8.1 DiscussionWorkability is a combin
19、ation of severalproperties, including: plasticity, consistency, cohesion,adhesion, water retentivity, setting characteristics, and itscapacity to remain satisfactory under the influence of masonryunit suction and ambient environmental conditions. Many ofthese properties have defied exact laboratory
20、measurement.The mason can best assess workability by observing theresponse of the mortar to the trowel and the masonry unit. Forfurther discussion on workability, see the Appendix of Speci-fication C270.4. Classification4.1 Admixtures are classified by their effect on the perfor-mance characteristic
21、s 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 Enhancer.4.1.2 Workability Enhancer.4.1.3 Set Accelerator.4.1.4 Set Retarder.4.1.5 Water Repellent.5. Materials5.1
22、 Cementitious MaterialsCementitious materials shallconform to those allowed in Specification C270 for proportionspecification mortars.5.2 SandThe fine aggregate used in the tests shall conformto the requirements of Specification C144. The sand used inpreparing the mortars for all tests shall be from
23、 the samedelivery.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 attachedmaterials. Nonetheless, th
24、e 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-soluble chloride, or 90 pp
25、m (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 Specification C270.Inaddit
26、ion, 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 averaged. These resultaverag
27、es 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 Proportions8.1 Desig
28、n 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 mate-rials. In additio
29、n, the aggregate shall meet the requirements in5.2.8.2 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 theflow or penetration appropriate for each test method. Theadmixture
30、 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 For all required tests, test
31、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 proportions shall be as specifi
32、ed in Section 8 andaggregates shall be as specified in 5.2. 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 of the 10 g specified in Test
33、Method C1218/C1218M.Determine the acid-soluble chloride content of the other threecubes, as percent chloride by mass of mortar, in accordanceC1384 182with Test Method C1152/C1152M except increase the samplesize to 15 g instead of the 10 g specified in Test MethodC1152/C1152M.9.1.2 Compressive Streng
34、thPrepare 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 5.2. Test three specimens at 7 days and threespecimens at 28 days.9.1.3 Water RetentionPrepare and test mortar in accor-dance with
35、 Specification C270, except that mortar proportionsshall be as specified in Section 8 and aggregates shall be asspecified in 5.2.9.1.4 Air Content of Plastic MortarPrepare mortar anddetermine air content of the plastic mortar in accordance withSpecification C270 except that mortar proportions shall
36、be asspecified in Section 8 and aggregates shall be as specified in5.2. 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= weight of hydrated lime,
37、g,W3= weight of mortar cement or masonry cement, g,W4= weight of 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 mo
38、rtar admixture, g/cm3,A = volume of air, %, andWM= weight of 400 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 sh
39、all be as specifiedin 5.2. Prepare the mortar in accordance with the procedures ofTest Method C780, modifying those as appropriate when theadmixture is added to the mortar. Mix the mortar for 5 min,TABLE 1 Physical RequirementsABond Enhancer Workability Enhancer Set Accelerator Set Retarder Water Re
40、pellentCompressive 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 plasticmortar, % report report report report reportBoard life, min % ofreference report 120 report 120 reportTime of settingB,allo
41、wable 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 8:00Clater1:00 earlier nor 1:30laterFinal: at least . . . . . . 1:00 earlier . . . . . .not more than 1:00 earlier nor 1:30l
42、ater1:00 earlier nor 3:30later. . . 8:00Clater1:00 earlier nor 1:30laterFlexural bond strength,min % of reference 110 . . . . . . . . . . . .Rate of water absorptionmax % of reference 24h;28 days . . . . . . . . . . . . 50AThe values in the table include allowance for normal variation in test result
43、s. 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 5.4F), except those for set accelerators, which shall be performed at 5 2C (41 3.6F) as specifiedin 9.1.
44、5.CThe manufacturers maximum recommended dosage rate shall be used when testing the initial and final set times for a set retarder.C1384 183timing from when water and cementitious materials are com-bined or as recommended by the manufacturer. The mixer usedshall conform to that described in Practice
45、 C305, 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 pene
46、tration 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 (
47、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 Annex A3.9.1.6 Time of SettingTest mortar in acco
48、rdance with TestMethod C403/C403M except for the modifications in thissection. The mortar proportions shall be as specified in Section8 and aggregates shall be as specified in 5.2. Prepare the mortarin accordance with the procedures of Test Method C780,modifying those as appropriate when the admixtu
49、re is added tothe mortar. Mix the mortar for 5 min, timing from when waterand cementitious materials are combined or as recommendedby the manufacturer. The mixer used shall conform to thatdescribed in Practice C305, or to that described in PracticeC723, or shall be a paddle-type field mortar mixer. Prepare themortar to have a flow of 110 6 5 mm as determined by TestMethod C1437. Prepare and test the mortar at a temperature of23 6 3C (73.4 6 5.4F) for all admixture classificationsexcept set accelerators. Prepare and test the mortar at atempera
