1、Designation: C1384 12 C1384 12aStandard 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
2、in parentheses 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 masonry mortars. Admixtures are substances other than Specification C270prescribed materials of
3、 water, aggregate, and cementitious materials that are used to improve one or more of the recognizeddesirable properties of conventional masonry mortar.1.2 This specification does not cover coloring pigments.NOTE 1Information on coloring pigments can be found in Specification C979.1.3 This specifica
4、tion does not cover additives that are added to the cementitious materials during the manufacture of thecementitious materials.1.4 Acceptance of an admixture is based on its performance in an admixed mortar. Acceptance of the admixed masonry mortaris based on attainment of performance either equival
5、ent to that required for conventional mortar or improved performance of oneor more indicated properties, while maintaining required performance levels for other properties.1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.N
6、OTE 2The testing laboratory performing the test methods referenced in this specification should be evaluated in accordance with Practice C1093.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC144 Specification for Aggregate for Masonry MortarC150 Specification for Port
7、land CementC207 Specification for Hydrated Lime for Masonry PurposesC270 Specification for Mortar for Unit MasonryC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of Concrete Mixtures by Penetration Resistance
8、C595 Specification for Blended Hydraulic CementsC723 Practice for Chemical-Resistant Resin Grouts for Brick or TileC778 Specification for SandC780 Test Method for Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit MasonryC979 Specification for Pigments for Integrall
9、y Colored ConcreteC1072 Test Methods for Measurement of Masonry Flexural Bond StrengthC1093 Practice for Accreditation of Testing Agencies for MasonryC1152/C1152M Test Method for Acid-Soluble Chloride in Mortar and ConcreteC1157 Performance Specification for Hydraulic CementC1218/C1218M Test Method
10、for Water-Soluble Chloride in Mortar and ConcreteC1329 Specification for Mortar CementC1403 Test Method for Rate of Water Absorption of Masonry MortarsC1437 Test Method for Flow of Hydraulic Cement Mortar1 This specification is under the jurisdiction of ASTM Committee C12 on Mortars and Grouts for U
11、nit Masonry and is the direct responsibility of Subcommittee C12.03on Specifications for Mortars.Current edition approved June 1, 2012Dec. 15, 2012. Published July 2012 January 2013. Originally approved in 1998. Last previous approved in 20062012 as editionC1384 06a.C1384 12. DOI: 10.1520/C1384-12.1
12、0.1520/C1384-12A.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and
13、 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 users consult prior editions as appropriate. In all cases only t
14、he current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 Defini
15、tions of Terms Specific to This Standard:3.1.1 admixed mortar, nmasonry mortar that deviates from those combinations of materials recognized by Specification C270in that it also contains an admixture.3.1.2 admixture, nsubstance other than the Specification C270 prescribed materials of water, aggrega
16、te, and cementitiousmaterials that is added to a masonry mortar to modify one or more properties of the conventional masonry mortar.3.1.3 bond enhancer, nadmixture used to increase the bond strength between the masonry mortar and the masonry unit.3.1.4 reference mortar, nmortar of the same compositi
17、on as an admixed mortar except that the reference mortar does notinclude the admixture and may contain a different amount of water to obtain an equivalent flow or penetration as the admixedmortar.3.1.5 set accelerator, nadmixture used to shorten the time of setting of a masonry mortar.3.1.6 set reta
18、rder, nadmixture used to lengthen the time of setting of a masonry mortar.3.1.7 water repellent, nadmixture used to decrease the rate of water absorption of the hardened masonry mortar.3.1.8 workability enhancer, nadmixture used in a masonry mortar to increase the ease of being worked and used.3.1.8
19、.1 DiscussionWorkability is a combination of several properties, including: plasticity, consistency, cohesion, adhesion, water retentivity, settingcharacteristics, and its capacity to remain satisfactory under the influence of masonry unit suction and ambient environmentalconditions. Many of these p
20、roperties have defied exact laboratory measurement. The mason can best assess workability byobserving the response of the mortar to the trowel and the masonry unit. For further discussion on workability, see the Appendixof Specification C270.4. Classification4.1 Admixtures are classified by their ef
21、fect on the performance characteristics of conventional masonry mortars. Admixedmortars are classified by their modified properties, as compared to a reference mortar. The following classifications are recognized:4.1.1 Bond Enhancer.4.1.2 Workability Enhancer.4.1.3 Set Accelerator.4.1.4 Set Retarder
22、.4.1.5 Water Repellent.5. Materials5.1 CementsThe cement used in the evaluation of the admixture shall conform to applicable requirements specified in5.1.1-5.1.5.5.1.1 Cement, PortlandWhen the admixture is evaluated in a mortar containing portland cement, the portland cement shallconform to the requ
23、irements for Type I, IA, II, IIA, III, or IIIA of Specification C150.5.1.2 Cement, Blended HydraulicWhen the admixture is evaluated in a mortar containing blended hydraulic cement, theblended hydraulic cement shall conform to the requirements for Type IS, IS-A, IP, IP-A, I(PM) or I(PM)-A of Specific
24、ation C595.5.1.3 Cement, HydraulicWhen the admixture is evaluated in a mortar containing a hydraulic cement, the hydraulic cementshall conform to the requirements for Type GU, HE, MS, HS, MH, or LH of Specification C1157.5.1.4 Cement, MasonryWhen the admixture is evaluated in a mortar containing a m
25、asonry cement, the masonry cement shallconform to the requirements of Specification C91.5.1.5 Cement, MortarWhen the admixture is evaluated in a mortar containing a mortar cement, the mortar cement shallconform to the requirements of Specification C1329.5.2 LimeWhen the admixture is evaluated in a c
26、ement-lime mortar, the hydrated lime shall conform to Specification C207.5.3 SandThe fine aggregate used in the tests will vary dependent on the test procedure.5.3.1 Sands used for soluble chloride, flexural bond strength and rate of water absorption tests shall be a blend of equal partsby weight of
27、 graded standard sand and standard 20-30 sand conforming with Specification C778.5.3.2 Sands used for compressive strength, water retention, determination of air content of plastic mortar, board life, and timeof setting tests shall conform to the requirements of Specification C144.6. Chemical Compos
28、ition6.1 The admixture shall not react adversely with embedded or attached materials common to masonry.C1384 12a2NOTE 3Currently, there is no standard test method for determining the corrosion potential of masonry mortars toward embedded and attachedmaterials. Nonetheless, the admixture shall not be
29、 offered for sale if the manufacturer has evidence that the admixture does react adversely with embeddedor attached materials common to masonry.6.2 At the maximum recommended dosage, the mortar admixture shall add not more than 65 ppm (0.0065 %) water-solublechloride, or 90 ppm (0.0090 %) acid-solub
30、le chloride to the mortars overall chloride content as determined by testing of thereference and admixed mortars in accordance with 9.1.1.7. Physical Properties7.1 All modified masonry mortars shall comply with the property specification requirements of Specification C270. In addition,the admixed mo
31、rtars shall conform to all of the specific classification requirements in Table 1 for which the admixture is obtainingqualification. Unless more specimens are required by a specific test method, a minimum of three specimens shall be tested and theresults averaged. These result averages shall meet th
32、e requirements of this section.7.2 Admixture compliance tests shall be the responsibility of the manufacturer of the admixture. These compliance tests shallbe completed within the past five (5) years and prior to any admixture composition change.8. Mortar Types and Proportions8.1 Design the referenc
33、e mortar to be a specific type of cement/lime, mortar cement, or masonry cement mortar in conformancewith the proportion specification of Specification C270 except that the aggregate ratio shall be fixed at three times the sum of theseparate volumes of cementitious materials. In addition, the aggreg
34、ate shall meet the requirements in 5.3.8.2 The corresponding admixed mortars shall have the same composition as the reference mortars but also shall include theadmixture, and the water content shall be adjusted to yield the flow or penetration appropriate for each test method. The admixturedosage ra
35、te, time of addition, and mixing sequence shall follow the manufacturers recommendations.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
36、% ofreference: report 100 report report reportAir content of plasticmortar, % 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 1:00C later . . .not more t
37、han 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 1:30later1:00 earlier nor 3:30later. . . 8:00Clater1:00 earlier nor 1:30laterFlexural bond strength,min % of ref
38、erence 110 . . . . . . . . . . . .Rate of water absorptionmax % of reference 24h . . . . . . . . . . . . 50Rate of water absorptionmax % of reference 24h;28 days . . . . . . . . . . . . 50A The values in the table include allowance for normal variation in test results. In addition to meeting the req
39、uirements in this table, all admixed mortars must meet theproperty requirements of Specification C270.B All 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 9.1.5.C The manufacturers maximum re
40、commended dosage rate shall be used when testing the initial and final set times for a set retarder.C1384 12a38.3 A complete set of tests shall be run for all applicable cement/lime, mortar cement, and masonry cement types for which theadmixture is to be qualified.9. Test Methods9.1 For all required
41、 tests, test both the reference mortar and the admixed mortar in accordance with the following test methods:9.1.1 Soluble Chloride ContentPrepare six mortar cubes in accordance with the specimen preparation section of Test MethodC1403 including the drying procedure, except that mortar proportions sh
42、all be as specified in Section 8 and aggregates shall beas specified in 5.3. After 28 days of age, determine the water-soluble chloride content of three cubes, as percent chloride by massof mortar, in accordance with Test Method C1218/C1218M except increase the sample size to 15 g instead of the 10
43、g specifiedin Test Method C1218/C1218M. Determine the acid-soluble chloride content of the other three cubes, as percent chloride by massof mortar, in accordance with Test Method C1152/C1152M except increase the sample size to 15 g instead of the 10 g specifiedin Test Method C1152/C1152M.9.1.2 Compr
44、essive StrengthPrepare and test mortar in accordance with Specification C270, except that mortar proportionsshall be as specified in Section 8 and aggregates shall be as specified in 5.3. Test three specimens at 7 days and three specimensat 28 days.9.1.3 Water RetentionPrepare and test mortar in acc
45、ordance with Specification C270, except that mortar proportions shall beas specified in Section 8 and aggregates shall be as specified in 5.3.9.1.4 Air Content of Plastic MortarPrepare mortar and determine air content of the plastic mortar in accordance withSpecification C270 except that mortar prop
46、ortions shall be as specified in Section 8 and aggregates shall be as specified in 5.3.Calculate the air content to the nearest 0.1 % as follows:D 5 W11W21W 31W41W51VW!W1P11W2P2 1W 3P3 1W4P4 1W 5P5 1VW(1)A 51002 WM4Dwhere:D = density of air-free mortar, g/cm3,W1 = weight of portland cement, g,W2 = w
47、eight 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
48、of sand, g/cm3,P5 = density of mortar admixture, g/cm3 ,A = volume of air, %, andWM = weight of 400 mL of mortar, g.9.1.5 Board LifeTest mortar in accordance with Test Method C780, Annex A2 or, alternately, Annex A3, except for themodifications in this section. The mortar proportions shall be as spe
49、cified in Section 8 and aggregates shall be as specified in 5.3.Prepare the mortar in accordance with the procedures of Test Method C780, modifying those as appropriate when the admixtureis added to the mortar. Mix the mortar for 5 min, timing from when water and cementitious materials are combined or asrecommended by the manufacturer. The mixer used shall conform to that described in Practice C305, or to that described inPractice C723, or shall be a paddle-type field mortar mixer.9.1.5.1 If Test Method C780, Annex A2 is used, prepare t
