1、Designation: C 1384 06aStandard Specification forAdmixtures for Masonry Mortars1This standard is issued under the fixed designation C 1384; 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 pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 SpecificationC 270 prescribed materials of water
3、, aggregate, 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 C 979.1.3 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 PracticeC 1093.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC 144 Specification for Aggregate for Masonry MortarC 150 Specification for Portland
7、CementC 207 Specification for Hydrated Lime for Masonry Pur-posesC 270 Specification for Mortar for Unit MasonryC 305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC 403/C 403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC
8、 595 Specification for Blended Hydraulic CementsC 723 Practice for Chemical-Resistant Resin Grouts forBrick or TileC 778 Specification for Standard SandC 780 Test Method for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonryC 979 Specification for Pigments for
9、 Integrally ColoredConcreteC 1093 Practice for Accreditation of Testing Agencies forUnit MasonryC 1152/C 1152M Test Method for Acid-Soluble Chloride inMortar and ConcreteC 1157 Performance Specification for Hydraulic CementC 1218/C 1218M Test Method for Water-Soluble Chloridein Mortar and ConcreteC
10、1329 Specification for Mortar CementC 1357 Test Methods for Evaluating Masonry BondStrengthC 1403 Test Method for Rate of Water Absorption ofMasonry MortarsC 1437 Test Method for Flow of Hydraulic Cement Mortar3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 admixed mortar, nma
11、sonry mortar that deviatesfrom those combinations of materials recognized by Specifi-cation C 270 in that it also contains an admixture.3.1.2 admixture, nsubstance other than the SpecificationC 270 prescribed materials of water, aggregate, and cementi-tious materials that is added to a masonry morta
12、r to modify oneor more properties of the conventional masonry mortar.1This specification 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 May 1, 2006.
13、Published May 2006. Originallyapproved in 1998. Last previous approved in 2006 as edition C 1384 06.2For 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 Do
14、cument Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 bond enhancer, nadmixture used to increase thebond strength between the ma
15、sonry mortar and the masonryunit.3.1.4 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 accelerato
16、r, nadmixture used to shorten the timeof setting of a masonry mortar.3.1.6 set retarder, nadmixture used to lengthen the timeof setting 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, nadmix
17、ture used in a ma-sonry mortar to increase the ease of being worked and used.3.1.8.1 DiscussionWorkability is a combination of sev-eral properties, including: plasticity, consistency, cohesion,adhesion, water retentivity, setting characteristics, and itscapacity to remain satisfactory under the infl
18、uence of masonryunit suction and ambient environmental conditions. Many ofthese properties have defied exact laboratory 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
19、of Speci-fication C 270.4. 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.
20、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 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
21、a mortar containing portland cement, the portland cementshall conform to the requirements for Type I, IA, II, IIA, III, orIIIA of Specification C 150.5.1.2 Cement, Blended HydraulicWhen the admixture isevaluated in a mortar containing blended hydraulic cement, theblended hydraulic cement shall confo
22、rm to the requirementsfor Type IS, IS-A, IP, IP-A, I(PM) or I(PM)-A of SpecificationC 595.5.1.3 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 C 1157.5
23、.1.4 Cement, 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 requir
24、ements of Specification C 1329.5.2 LimeWhen the admixture is evaluated in a cement-lime mortar, the hydrated lime shall conform to SpecificationC 207.5.3 SandThe fine aggregate used in the tests will varydependent on the test procedure.5.3.1 Sands used for soluble chloride, flexural bond strengthand
25、 rate of water absorption tests shall be a blend of equal partsby weight of graded standard sand and standard 20-30 sandconforming with Specification C 778.5.3.2 Sands used for compressive strength, water retention,determination of air content of plastic mortar, board life, andtime of setting tests
26、shall conform to the requirements ofSpecification C 144.6. 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
27、and attachedmaterials. 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 (0.00
28、65 %) water-soluble 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 requ
29、irements of Specification C 270.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 t
30、he results averaged. 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
31、. Mortar Types and 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 SpecificationC 270 except that the aggregate ratio shall be fixed at threetimes the sum of the separate volume
32、s of cementitious mate-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 theflow or penetration approp
33、riate for each test method. TheC 1384 06a2admixture 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 qualifi
34、ed.9. Test Methods9.1 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 C 1403 including the drying procedur
35、e, except thatmortar proportions 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 C 1218 except increase the sample size
36、 to 15 g insteadof the 10 g specified in Test Method C 1218. Determine theacid-soluble chloride content of the other three cubes, aspercent chloride by mass of mortar, in accordance with TestMethod C 1152 except increase the sample size to 15 g insteadof the 10 g specified in Test Method C 1152. .9.
37、1.2 Compressive StrengthPrepare and test mortar inaccordance with Specification C 270, 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 mor
38、tar in accor-dance with Specification C 270, 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 C 270 except that
39、mortar 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 5W11 W21 W31 W41 W51 VW!W1P11W2P21W3P31W4P41W5P51 VW(1)A 5 100 2WM4Dwhere:D = density of air-free mortar, g/cm3,W1= weight of portland cement,
40、g,W2= weight of hydrated lime, 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 o
41、f sand, g/cm3,P5= density of mortar admixture, g/cm3,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 rep
42、ort reportAir content of plasticmortar, % report report report report reportBoard life, min % ofreference report 120 report 120 reportTime of settingB, allowabledeviation from reference,h: min:Initial: at least . . . . . . 1:00 earlier 1:00Clater . . .not more than 1:00 earlier nor 1:30later1:00 ear
43、lier nor 3:30later3:30 earlier 8:00Clater1:00 earlier nor 1:30laterFinal: at least . . . . . . 1:00 earlier . . . . . .not more than 1:00 earlier nor 1:30later1:00 earlier nor 3:30later. . . 8:00Clater1:00 earlier nor 1:30laterFlexural bond strength,min % of reference 110 . . . . . . . . . . . .Rate
44、 of water absorptionmax % of reference 24 h . . . . . . . . . . . . 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 C 270.BAll time of set
45、ting tests shall be performed at 23 6 3C (73.4 6 5.4F), except those for set accelerators, which shall be performed at 5 6 2C (41 6 3.6F) 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.C 1384 06a3A
46、 = volume of air, %, andWM= weight of 400 mL of mortar, g.9.1.5 Board LifeTest mortar in accordance with TestMethod C 780, 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
47、5.3. Prepare the mortar in accordance with the procedures ofTest Method C 780, 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
48、conform to that described in Practice C 305, or to thatdescribed in Practice C 723, or shall be a paddle-type fieldmortar mixer.9.1.5.1 If Test Method C 780,AnnexA2 is used, prepare themortar to have an initial penetration of 60 6 5 mm. Measurethe initial penetration within 2 min from the completion
49、 of themixing. Record the initial penetration 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 C 780, AnnexA3 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 i
