1、Designation: C1660 10Standard 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, the year of last
2、 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 pe
3、rforming 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 considered standard.1.4 T
4、his 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 the
5、applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC144 Specification for Aggregate for Masonry MortarC150 Specification for Portland CementC207 Specification for Hydrated Lime for Masonry Pur-posesC595 Specification fo
6、r 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 for Unit MasonryC1232 Terminology of MasonryC1329 Spec
7、ification for Mortar CementC1384 Specification for Admixtures for Masonry MortarsC1386 Specification for Precast Autoclaved Aerated Con-crete (AAC) Wall Construction UnitsC1452 Specification for Reinforced Autoclaved AeratedConcrete ElementsC1555 Practice for Autoclaved Aerated Concrete Masonry3C160
8、0/C1600M Specification for Rapid Hardening Hy-draulic Cement3. Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication, refer to Terminologies C1180 and C1232, and Speci-fication C1386.3.2 Definitions of Terms Specific to This Standard:3.2.1 thin-bed mortar, npreblended mortar
9、 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 used in the construction of AAC masonry. It referencesdirectly the AAC materials standards under the juris
10、diction 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 requirements specified.5.1.1 Masonry cement shall conform to Specification C91.5.1.2 Fine aggregates shall co
11、nform 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.Type N lime is perm
12、itted 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 SpecificationC1157.1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Gr
13、outs for Unit Masonry and is the direct responsibility of Subcom-mittee C12.03 on Specifications for Mortars.Current edition approved June 1, 2010. Published June 2010. Originallyapproved in 2009. Last previous edition approved in 2009 as C1660 09. DOI:10.1520/C1660-10.2For referenced ASTM standards
14、, 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.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.
15、org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.1.7 Mortar cement shall conform to Specification C1329.5.1.8 Rapid hardening hydraulic cement shall conform toSpecification C1600/C1600M.5.1.9 AdhesivesAt the maximum recommended
16、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 asdetermined by testing of the reference and admixed mortars inaccordance with the Soluble Chloride Content section ofSpeci
17、fication 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 Splitting Tensile Strength Test:6.1.1 Conduct the splitting tensile strength test in accor-dance with Test Method C10
18、06 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 which they are selected.6.1.1.2 Test Block SelectionDry-cut test specimens fromAAC material conforming to Specificati
19、on 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 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
20、.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 and not the cut face. Applymortar, in an amount recommended by the mortar manufac-turer, to the joint area of the sp
21、ecimen 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 surfaces of the pair are now both in contact withthe mortar. Press firmly by hand to ensure intimate contactbetween unit specimens and mo
22、rtar. 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 15F (24 6 8C) anda relative humidity of less than 80 % for at least 28 days, or fora time prescribed by the mort
23、ar 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 steel rods, at least 4-in.(100-mm) long, to the test specimen using hot glue or otherappropriate method so that
24、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 testingmachine using compressible foam tubing as positioning aids(Fig. 2). Load to failure. Record peak load readings
25、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, brand name and lot of evaluated thin-bedmortar.7.3 Age, peak load, and corresponding splitting tensilestrength for e
26、ach specimen, computed in accordance withSpecification C1006.8. Strength Requirements8.1 The average splitting tensile strength of the mortaredAAC specimens shall equal or exceed the value shown in Table1 for the corresponding strength class of AAC.9. Keywords9.1 autoclaved aerated concrete (AAC); m
27、asonry; splittingtensile strength; thin-bed mortarFIG. 1 Extracting Cubes for SpecimenC1660 102BIBLIOGRAPHY(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 al
28、so be secured from the ASTM website (www.astm.org/COPYRIGHT/).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 Strengthof the Specimen
29、,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 C1386 defines various AAC strength classes as well as therespective minimum specified compressive strength for each class. Table 1defines minimum splitting tensile streng
30、ths 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.C1660 103
