ASTM_C_495_-_C_495M_-_12.pdf

Designation:C495/C495M12Standard Test Method forCompressive Strength of Lightweight Insulating Concrete1This standard is issued under the fixed designation C495/C495M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 This test method covers the preparation of specimensand the determination of the compressive strength of light-weight insulating concrete having an oven-dry density notexceeding 800 kg/m350 lb/ft3 as determined by the proce-dures described herein.This test method covers the preparationand testing of molded 75 by 150-mm 3 by 6-in.cylinders.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety problems,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:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC88 Test Method for Soundness of Aggregates by Use ofSodium Sulfate or Magnesium SulfateC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C172 Practice for Sampling Freshly Mixed ConcreteC617 Practice for Capping Cylindrical Concrete SpecimensC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materials3.Significance and Use3.1 This test method provides standardized requirements forsampling,molding,curing,and testing lightweight insulatingconcretes for the purpose of determining compliance withcompressive strength and density specifications.4.Apparatus4.1 Testing MachineUse a testing machine as prescribedin Test Method C39/C39M.4.2 Scales and WeightsUse scales and weights in weigh-ing specimens that conform to those specified in the ApparatusSection of Test Method C109/C109M.4.3 Drying OvenUse an oven as specified in Test MethodC88.4.4 MoldsUse molds made of nonabsorbent materials orof materials treated to reduce absorption,that are watertight,and not subject to distortion of more than 2 mm 116in.in anydimension during molding and early curing of specimens.Coatall mold surfaces that will be in contact with concrete exceptsingle use plastic molds with wax or mineral oil,prior to use.Use molds having a diameter of 75 6 2 mm 3 6116in.anda length of 150 6 3 mm 6 618in.5.Sampling5.1 Sample fresh lightweight insulating concrete in accor-dance with applicable provisions of Practice C172,with thefollowing exceptions:5.1.1 Sampling from Pump EquipmentFill a bucket ofapproximately 9-L 10-qt capacity by passing through thedischarge stream of the concrete pump hose being used to placethe concrete,at the point of placement of the concrete.Exercisecare to ensure that the sample is representative of the pour,avoiding the beginning or ending of the discharge from theequipment.Prepare the test specimens as described in Section6,by filling them with a scoop of lightweight insulatingconcrete dipped from the bucket.5.1.2 Remixing SampleDo not remix the sample.6.Test Specimens6.1 Size and ShapeUse cylindrical test specimens 75 6 2mm 3 6116in.in diameter and 150 6 3 mm 6 618in.in1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.21 on Lightweight Aggregates and Concrete.Current edition approved April 1,2012.Published April 2012.Originallyapproved in 1962.Last previous edition approved in 2007 as C49507.DOI:10.1520/C0495_C0495M-12.2For 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.*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 States1 length,with the base of each specimen perpendicular to thelongitudinal axis within the limits prescribed in 6.8.6.2 NumberThe compressive strength of the sample shallbe based on the average strength of four cylinders.Obtain atleast four test cylinders for compressive strength tests fromeach sample of lightweight insulating concrete.6.3 MoldingIn molding the specimens,place the concretein two approximately equal layers.Tap the outs