1、Designation: C 1660 09Standard Specification forThin-bed Mortar for Autoclaved Aerated Concrete (AAC)Masonry1This standard is issued under the fixed designation C 1660; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st 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 testing laboratory
3、performing these test methodsshall be evaluated in accordance with Practice C 1093.1.3 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 considered standard.1.
4、4 This standard may involve hazardous materials, opera-tions, 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 and health practices and deter-mine t
5、he applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC 144 Specification for Aggregate for Masonry MortarC 150 Specification for Portland CementC 207 Specification for Hydrated Lime for Masonry Pur-posesC 595 Specifica
6、tion for Blended Hydraulic CementsC 1006 Test Method for Splitting Tensile Strength of Ma-sonry UnitsC 1093 Practice for Accreditation of Testing Agencies forMasonryC 1157 Performance Specification for Hydraulic CementC 1180 Terminology of Mortar and Grout for Unit MasonryC 1232 Terminology of Mason
7、ryC 1329 Specification for Mortar CementC 1384 Specification for Admixtures for Masonry MortarsC 1386 Specification for Precast Autoclaved Aerated Con-crete (AAC) Wall Construction UnitsC 1452 Specification for Reinforced Autoclaved AeratedConcrete ElementsC 1555 Practice for Autoclaved Aerated Conc
8、rete MasonryC 1600/C 1600M Specification for Rapid Hardening Hy-draulic Cement3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminologies C 1180 and C 1232, andSpecification C 1386.3.2 Definitions of Terms Specific to This Standard:3.2.1 thin-bed mortarp
9、reblended mortar for use in con-struction of AAC unit masonry whose joints are approximately116 to18-in. (2 to 3-mm) thick.4. Significance and Use4.1 This specification applies to the thin-bed mortar mate-rials used in the construction of AAC masonry. It referencesdirectly the AAC materials standard
10、s under the jurisdiction ofASTM Committees C15 and C27 including SpecificationsC 1386, C 1452, and C 1555.5. Materials5.1 Materials used in the preparation of thin-bed mortar forAAC masonry shall conform to the requirements specified.5.1.1 Masonry cement shall conform to Specification C91.5.1.2 Fine
11、 aggregates shall conform to Specification C 144with 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 C 150.5.1.4 Hydrated lime shall conform to Specification C
12、207.Type 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 C 595.5.1.6 Hydraulic cement shall conform to SpecificationC 1157.5.1.7 Mortar cement shall conform to Specification C 1329.1
13、This 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 July 1, 2009. Published August 2009.2For referenced ASTM standards, visit the ASTM
14、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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
15、States.5.1.8 Rapid hardening hydraulic cement shall conform toSpecification C 1600/C 1600M.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 chlorid
16、e content asdetermined by testing of the reference and admixed mortars inaccordance with the Soluble Chloride Content section ofSpecification C 1384.5.1.10 Other materials are permitted if shown by test orperformance record not to be detrimental to the durability ofthe mortar or embedded items.6. Me
17、thods of Test6.1 Splitting Tensile Strength Test:6.1.1 Conduct the splitting tensile strength test in accor-dance with Test Method C 1006 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 arerepresentativ
18、e of the lot from which they are selected.6.1.1.2 Test Block SelectionDry-cut test specimens fromAAC material conforming to Specification C 1386. 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
19、cubes from block, each 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 themanufactur
20、ed face of the unit and not the cut face. Applymortar, in an amount recommended by the mortar manufac-turer, to the joint area of the specimen to produce a full beddedjoint, approximately116-in. (2-mm) to18-in. (3-mm) thick.Place the other specimen pair on top of the mortar so that themanufactured s
21、urfaces of the pair are now both in contact withthe 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 a
22、t a temperature of 75 6 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) Attach
23、12-in. (13-mm) diameter 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 int
24、o the compression testingmachine 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 C 13
25、86.7.2 Manufacturer, brand name and lot of evaluated thin-bedmortar.7.3 Peak load and corresponding splitting tensile strengthfor each specimen, computed in accordance with SpecificationC 1006.8. Strength Requirements8.1 The average splitting tensile strength of the mortaredAAC specimens shall equal
26、 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. 1 Extracting Cubes for SpecimenC1660092BIBLIOGRAPHY(1) Autoclaved Aerated Concrete: Properties, Testing, and Desi
27、gn,RILEM Recommended Practice, Taylor or through the ASTM website(www.astm.org).FIG. 2 Test Setup For Measuring Splitting Tensile StrengthTABLE 1 Minimum Splitting Tensile Strength of Test SpecimenAAAC Strength Class SpecifiedCompressive Strengthof AAC, f 8AAC,psi (MPa)MinimumSplitting Tensile Stren
28、gthof 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)ASpecification C 1386 defines various AAC strength classes as well as therespective minimum specified compressive strength for each class. Table 1defines minimum split
29、ting tensile strengths for each AAC strength class.BValues for minimum splitting tensile strength as shown in Table 1 aredetermined from the following equations:ftAAC5 2.4=f 8AACwhere ftAACand f 8AACare expressed in units of pounds per square inch, psi.orftAAC5 0.2=f 8AACwhere ftAACand f 8AACare expressed in units of mega-pascals, MPa.C1660093
