1、Designation: C1660 10 (Reapproved 2018)Standard Specification forThin-bed Mortar for Autoclaved Aerated Concrete (AAC)Masonry1This standard is issued under the fixed designation C1660; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification applies to thin-bed mortar for auto-claved aerated concrete (AAC) masonry.1.2 The tes
3、ting laboratory performing these test methodsshall be evaluated in accordance with Practice C1093.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not conside
4、red standard.1.4 This standard may involve hazardous materials,operations, and equipment. This standard does not purport toaddress all of the safety concerns, if any, associated with itsuse. It is the responsibility of the user of this standard toestablish appropriate safety, health, and environment
5、al prac-tices and determine the applicability of regulatory limitationsprior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Gui
6、des and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC144 Specification for Aggregate for Masonry MortarC150 Specification for Portland CementC207 Specification for Hy
7、drated Lime for Masonry Pur-posesC595 Specification for Blended Hydraulic CementsC1006 Test Method for Splitting Tensile Strength of Ma-sonry UnitsC1093 Practice for Accreditation of Testing Agencies forMasonryC1157 Performance Specification for Hydraulic CementC1180 Terminology of Mortar and Grout
8、for Unit MasonryC1232 Terminology for MasonryC1329 Specification for Mortar CementC1384 Specification for Admixtures for Masonry MortarsC1386 Specification for Precast Autoclaved Aerated Con-crete (AAC) Wall Construction Units (Withdrawn 2013)3C1452 Specification for Reinforced Autoclaved AeratedCon
9、crete Elements (Withdrawn 2013)3C1555 Practice for Autoclaved Aerated Concrete Masonry(Withdrawn 2009)3C1600/C1600M Specification for Rapid Hardening Hydrau-lic Cement3. Terminology3.1 DefinitionsFor definitions of terms used in thisspecification, refer to Terminologies C1180 and C1232, andSpecifica
10、tion C1386.3.2 Definitions of Terms Specific to This Standard:3.2.1 thin-bed mortar, npreblended mortar for use inconstruction of AAC unit masonry whose joints are approxi-mately116 to18-in. (2 to 3-mm) thick.4. Significance and Use4.1 This specification applies to the thin-bed mortar mate-rials use
11、d in the construction of AAC masonry. It referencesdirectly the AAC materials standards under the jurisdiction ofASTM Committees C15 and C27 including SpecificationsC1386, C1452, and C1555.5. Materials5.1 Materials used in the preparation of thin-bed mortar forAAC masonry shall conform to the requir
12、ements specified.5.1.1 Masonry cement shall conform to Specification C91.1This 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 Jan. 1, 2
13、018. Published February 2018. Originallyapproved in 2009. Last previous edition approved in 2010 as C1660 10. DOI:10.1520/C1660-10R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandardsvolume infor
14、mation, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was
15、 developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15.1.2 Fine ag
16、gregates shall conform to Specification C144with the exception of the gradation requirements, which shallnot apply. The maximum aggregate size shall be that passing a#6 standard sieve.5.1.3 Portland cement shall conform to Specification C150.5.1.4 Hydrated lime shall conform to Specification C207.Ty
17、pe N lime is permitted if shown by test or performancerecord not to be detrimental to soundness of mortar.5.1.5 Blended hydraulic cement shall conform to Specifica-tion C595.5.1.6 Hydraulic cement shall conform to SpecificationC1157.5.1.7 Mortar cement shall conform to Specification C1329.5.1.8 Rapi
18、d hardening hydraulic cement shall conform toSpecification C1600/C1600M.5.1.9 AdhesivesAt the maximum recommended dosage,the adhesive admixture shall add not more than 65 ppm(0.0065 %) water soluble chloride, or 90 ppm (0.0090 %)acid-soluble chloride to the mortars overall chloride content asdetermi
19、ned by testing of the reference and admixed mortars inaccordance with the Soluble Chloride Content section ofSpecification C1384.5.1.10 Other materials are permitted if shown by test orperformance record not to be detrimental to the durability ofthe mortar or embedded items.6. Methods of Test6.1 Spl
20、itting Tensile Strength Test:6.1.1 Conduct the splitting tensile strength test in accor-dance with Test Method C1006 with the following modifica-tions.6.1.1.1 SamplingSample the mortar materials and AACblock used in the preparation of test specimens so that they arerepresentative of the lot from whi
21、ch they are selected.6.1.1.2 Test Block SelectionDry-cut test specimens fromAAC material conforming to Specification C1386. Each testset shall consist of five (5) pairs of test specimens. Each pair oftest specimens shall be cut from a full-size block as shown inFig. 1. Dry-cut cubes from block, each
22、 measuring 4 by 4 by 4in. (100 by 100 by 100-mm), 614-in. (66-mm). Clean cuttingdust from the cubes with dry air.6.1.1.3 Sample PreparationMix the mortar according toinstructions of the mortar manufacturer.(1) Orient the pairs so that the surface to be mortared is themanufactured face of the unit an
23、d not the cut face. Applymortar, in an amount recommended by the mortarmanufacturer, to the joint area of the specimen to produce a fullbedded joint, approximately116-in. (2-mm) to18-in. (3-mm)thick. Place the other specimen pair on top of the mortar so thatthe manufactured surfaces of the pair are
24、now both in contactwith the mortar. Press firmly by hand to ensure intimate contactbetween unit specimens and mortar. Clean excess mortar fromthe joint around the perimeter of the joined specimen toproduce a smooth, uniform surface across the joint. Cure thespecimens in air at a temperature of 75 6
25、15F (24 6 8C) anda relative humidity of less than 80 % for at least 28 days, or fora time prescribed by the mortar manufacturer, in a stackedposition.(2) Measure each cured test specimen to obtain an averagecross-sectional area of the mortared joint.6.1.1.4 Testing:(1) Attach12-in. (13-mm) diameter
26、steel rods, at least 4-in.(100-mm) long, to the test specimen using hot glue or otherappropriate method so that the rods touch and are aligned withthe upper and lower edges of the mortar joint between the twohalves of the test specimen (Fig. 2).(2) Place the test specimen into the compression testin
27、gmachine using compressible foam tubing as positioning aids(Fig. 2). Load to failure. Record peak load readings after eachspecimen is tested.7. Reporting Requirements7.1 Manufacturer of AAC block and its reported strengthclass, determined in accordance with Specification C1386.7.2 Manufacturer, bran
28、d name and lot of evaluated thin-bedmortar.FIG. 1 Extracting Cubes for SpecimenC1660 10 (2018)27.3 Age, peak load, and corresponding splitting tensilestrength for each specimen, computed in accordance withSpecification C1006.8. Strength Requirements8.1 The average splitting tensile strength of the m
29、ortaredAAC specimens shall equal or exceed the value shown in Table1 for the corresponding strength class of AAC.9. Keywords9.1 autoclaved aerated concrete (AAC); masonry; splittingtensile strength; thin-bed mortarFIG. 2 Test Setup For Measuring Splitting Tensile StrengthC1660 10 (2018)3BIBLIOGRAPHY
30、(1) Autoclaved Aerated Concrete: Properties, Testing, and Design,RILEM Recommended Practice, Taylor or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-260
31、0; http:/ 1 Minimum Splitting Tensile Strength of Test SpecimenAAAC StrengthClassSpecifiedCompressive Strengthof AAC, f AAC,psi (MPa)MinimumSplitting Tensile Strengthof the Specimen,ft AAC, psi (MPa)BAAC2 290 (2.0) 41 (0.28)AAC3 435 (3.0) 50 (0.34)AAC4 580 (4.0) 58 (0.40)AAC6 870 (6.0) 71 (0.49)ASpe
32、cification C1386 defines various AAC strength classes as well as therespective minimum specified compressive strength for each class. Table 1defines minimum splitting tensile strengths for each AAC strength class.BValues for minimum splitting tensile strength as shown in Table 1 are determinedfrom the following equations:ftAAC52.4f AACwhere ftAACand fAACare expressed in units of pounds per square inch, psi orftAAC50.2f AACwhere ftAACand fAACare expressed in units of mega-pascals, MPa.C1660 10 (2018)4
