ASTM_C_1591_-_04.pdf

Designation:C 1591 04Standard Test Method forDetermination of the Modulus of Elasticity of AAC1This standard is issued under the fixed designation C 1591;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 parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This procedure covers the determination of the modulusof elasticity of Autoclaved Aerated Concrete(AAC)in com-pression by determining the stress-strain behavior.AAC is acementitious product based on calcium silicate hydrates inwhich low density is attained by the inclusion of an agentresulting in macroscopic voids,and is subjected to highpressure steam curing.NOTE1Installed units covered by this standard must be protectedagainst direct exposure to moisture using a coating material accepted bythe AAC manufacturer.1.2 AAC tested in accordance with this test method shallcomply with Specification C 1386.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C 39/C 39M Test Method for Compressive Strength of Cy-lindrical Concrete SpecimensC 1386 Specification for Precast Autoclaved Aerated Con-crete Wall Construction UnitsE 4 Practices for Force Verification of Testing MachinesE 575 Practice for Reporting Data from Structural Tests ofBuilding Constructions,Elements,Connections and As-semblies3.Significance and Use3.1 This test method is intended to provide simplified andeconomical means for obtaining data on the chord modulus ofelasticity developed for different types of AAC grades.4.Apparatus4.1 Testing Machine,conforming to the requirements ofPractices E 4(Constant-Rate of-Traverse CRT-Type TestingMachine section).The spherical head and bearing blocks shallconfirm to the Apparatus Section of Test Method C 39/C 39M.4.2 CalipersCalipers shall allow a reading with a preci-sion of 0.1 mm.4.3 Drying OvensTwo ovens typically are used for thistest procedure.One maintained at a temperature of 105 6 5Cand another maintained at a temperature of 70 6 5C.4.4 Compressometer,may be used to determine the strainbehavior of the specimen during compression and shall have aprecision of 0.001 mm.5.Specimens5.1 Shape of SpecimensThe modulus of elasticity isdetermined on prisms having the dimensions of 100 mm(4 in.)by 100 mm(4 in.)by 200 mm(8 in.).Prisms of other sizes orcylindrical specimens can be used provided that the width(diameter)of such other specimens is not less than 75 mm(3in.)and the ratio between the height and the width shall be 2.5.2 Number and Orientation of SpecimensA test set shallconsist of three specimens.Whenever possible one specimenshall be prepared for the upper third of the product,one fromthe middle third,and one from the bottom third as determinedby the direction of rising of the mass during manufacturing.Specimens are prepared such that the loading is applied to the100 mm(4 in.)by 100 mm(4 in.)surface and is perpendicularto the direction of rising during manufacture.1This test method is under the jurisdiction of ASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of Subcommittee C27.60 onPrecast Autoclaved Aerated Concrete.Current edition approved Dec.1,2004.Published January 2005.2For 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 Document Summary page onthe ASTM website.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Copyright by ASTM Intl(all rights reserved);Thu Apr 16 09:57:10 EDT 2009Downloaded/printed byLaurentian University pursuant to License Agreement.No further reproductions authorized.5.3 Preparation of the SpecimensThe specimens shall bedried to a moisture content between 5 and 15%by weight.After drying and before testing the specimens shall be stored atroom temperature until the specimens have reached an equi-librium temperature.6.Procedure6.1 Density and Moisture Content DeterminationThe drydensity of comparable specimens and the moisture content ofthe test specimens shall be determined according to Specifica-tion C 1386.6.2 Determination of the Modulus of Elasticity:6.2.1 Compression TestingThe specimen is placed in thetesting machine such that the 100 mm(4 in.)by 100 mm(4 in.)surfaces are load bearing without capping.The dimensions ofthe load bearing surfaces shall be determined and recordedwith an accuracy of 3 mm(0.12 in.).