ASTM_C_796_-_C_796M_-_12.pdf

Designation:C796/C796M12Standard Test Method forFoaming Agents for Use in Producing Cellular ConcreteUsing Preformed Foam1This standard is issued under the fixed designation C796/C796M;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 furnishes a way of measuring,in thelaboratory,the performance of a foaming chemical to be usedin producing foam(air cells)for making cellular concrete.1.2 This test method includes the following:1.2.1 Manufacture of laboratory quantities of cellular con-crete.1.2.2 Determination of the air content of the freshly pre-pared cellular concrete and of the hardened concrete afterhandling in conventional machinery.1.2.3 Determination of the following properties of thehardened concrete:compressive strength,tensile splittingstrength,density,and water absorption.It may not be necessaryto study all of the above properties in all cases,depending onthe proposed use of the material.1.3 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.1.4 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.1.5 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.2.Referenced Documents2.1 ASTM Standards:2C88 Test Method for Soundness of Aggregates by Use ofSodium Sulfate or Magnesium SulfateC150 Specification for Portland CementC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC495 Test Method for Compressive Strength of LightweightInsulating ConcreteC496/C496M Test Method for Splitting Tensile Strength ofCylindrical Concrete SpecimensC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC802 Practice for Conducting an Interlaboratory Test Pro-gram to Determine the Precision of Test Methods forConstruction MaterialsC869 Specification for Foaming Agents Used in MakingPreformed Foam for Cellular Concrete3.Terminology3.1 Definitions:3.1.1 cellular concretea lightweight product consisting ofportland cement,cement-silica,cement-pozzolan,lime-pozzolan,or lime-silica pastes,or pastes containing blends ofthese ingredients and having a homogeneous void or cellstructure,attained with gas-forming chemicals or foamingagents(for cellular concretes containing binder ingredientsother than,or in addition to portland cement,autoclave curingis usually employed).3In cellular concrete the density controlis achieved by substituting macroscopic air cells for all or part1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.23 on Chemical Admixtures.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 1974.Last previous edition approved in 1997 as C79604.DOI:10.1520/C0796_C0796M-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.3ACI Committee 116,“Cement and Concrete Terminology,”American ConcreteInstitute,Publication SP-19,1967,p.144.*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 of the fine aggregate.Normal-weight coarse aggregate isusually not used but lightweight aggregates,both fine andcoarse,are often utilized in cellular concrete.3.2 Symbols:Dex1=experimental density of the concrete beforepumping,kg/m3lb/ft3Dex2=experimental density of the concrete after pumping,kg/m3lb/ft3Dth=theoretical density of the plastic mix based onabsolute volume,kg/m3lb/ft3Dd=design density of the text mixture,kg/m3lb/ft3SGC=specific gravity of cement=3.15T=time required to overfill the container,minT1=time required to generate 1 m31 ft3 of foam,minV=volume of foam container,m3ft3Va=volume of air required in the test batch,m3ft3Vc=volume of test specimen(cylinder),m3ft3Vf=volume of foam in the test batch,m3ft3Vw=volume of water a