ASTM_C_1074_-_11.pdf

Designation:C107411Standard Practice forEstimating Concrete Strengthby the Maturity Method1This standard is issued under the fixed designation C1074;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice provides a procedure for estimating con-crete strength by means of the maturity method.The maturityindex is expressed either in terms of the temperature-timefactor or in terms of the equivalent age at a specified tempera-ture.1.2 This practice requires establishing the strength-maturityrelationship of the concrete mixture in the laboratory andrecording the temperature history of the concrete for whichstrength is to be estimated.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC78 Test Method for Flexural Strength of Concrete(UsingSimple Beam with Third-Point Loading)C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC684 Test Method for Making,Accelerated Curing,andTesting Concrete Compression Test Specimens(With-drawn 2012)4C803/C803M Test Method for Penetration Resistance ofHardened ConcreteC873/C873M Test Method for Compressive Strength ofConcrete Cylinders Cast in Place in Cylindrical MoldsC900 Test Method for Pullout Strength of Hardened Con-creteC918/C918M Test Method for Measuring Early-Age Com-pressive Strength and Projecting Later-Age Strength3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 datum temperaturethe temperature that is subtractedfrom the measured concrete temperature for calculating thetemperature-time factor according to Eq 1.3.1.2 equivalent agethe number of days or hours at aspecified temperature required to produce a maturity equal tothe maturity achieved by a curing period at temperaturesdifferent from the specified temperature.3.1.3 maturitythe extent of the development of a propertyof a cementitious mixture.3.1.3.1 DiscussionWhile the term is used usually to de-scribe the extent of relative strength development,it can alsobe applied to the evolution of other properties that aredependent on the chemical reactions that occur in a cementi-tious mixture.At any age,maturity depends on the curinghistory.1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates and is the direct responsibility of Subcommittee C09.64 onNondestructive and In-Place Testing.Current edition approved June 15,2011.Published July 2011.Originallyapproved in 1987.Last previous edition approved in 2010 as C1074 10a.DOI:10.1520/C1074-11.2Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.*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 3.1.4 maturity functiona mathematical expression thatuses the measured temperature history of a cementitiousmixture during the curing period to calculate an index that isindicative of the maturity at the end of that period.Refer toAppendix X1 for additional discussion of this term.3.1.5 maturity indexan indicator of maturity that is calcu-lated from the temperature history of the cementitious mixtureby using a maturity function.3.1.5.1 DiscussionThe computed index is indicative ofmaturity provided there has been a sufficient supply of waterfor hydration or pozzolanic reaction of the cementitiousmaterials during the time used in the calculati