ASTM_C_341_-_C_341M_-_13.pdf

Designation:C341/C341M13Standard Practice forPreparation and Conditioning of Cast,Drilled,or SawedSpecimens of Hydraulic-Cement Mortar and Concrete Usedfor Length Change Measurements1This standard is issued under the fixed designation C341/C341M;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.1.Scope*1.1 This practice covers the procedures for the preparationand conditioning of cast,drilled,or sawed specimens ofhydraulic-cement mortar and concrete for length change due tocauses other than externally applied forces.It can be readilyadapted,if desired,to studies of length change involvingalternate schedules or environmental treatment other than thestandard procedures prescribed by this practice.1.2 The values stated in either inch-pound units or SI unitsshall be regarded separately as standard.The units stated ineach system may not be exact equivalents;therefore,eachsystem must be used independently of the other,withoutcombining in any way.The inch-pound units are shown inbrackets.1.3 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:2A276 Specification for Stainless Steel Bars and ShapesC31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC157/C157M Test Method for Length Change of HardenedHydraulic-Cement Mortar and ConcreteC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC490 Practice for Use ofApparatus for the Determination ofLength Change of Hardened Cement Paste,Mortar,andConcreteC666/C666M Test Method for Resistance of Concrete toRapid Freezing and Thawing3.Terminology3.1 Definition3.1.1 length change,nan increase or decrease in a lineardimension of a test specimen,which has been caused to changeby any factor other than externally applied forces and tempera-ture changes.4.Significance and Use4.1 Measurements of length change permit assessment ofthe potential for volumetric expansion or contraction of cast,drilled,or sawed specimens of hydraulic-cement mortar,andconcrete due to various causes other than externally appliedforces and temperature changes.This practice is particularlyuseful for comparative evaluation of this potential in differentmortar or concrete specimens.5.Apparatus5.1 Length ComparatorThe length comparator shall gen-erally conform to the requirements of Specification C490,except that it shall be constructed to accommodate the speci-mens to be tested under this practice,which shall have gaugelengths of 75 mm 3 in.or more.5.1.1 Gauge Studs in Ends of SpecimensWhen the com-parator is to be used to measure between gauge studs in theends of specimens,the gauge length for computing percentagelength change shall be considered to be the distance betweenthe innermost ends of the gauge studs,and the contactterminals of the comparator shall be plane,polished,heat-treated surfaces as described in Specification C490.Fig.3 ofSpecification C490 shows one type of comparator that has beenfound suitable for such specimens.A horizontal comparator isdesirable for specimens that are considered too large to behandled by the type of comparator illustrated in Fig.3 ofSpecification C490.1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates and is the direct responsibility of Subcommittee C09.68 onVolume Change.Current edition approved Dec.15,2013.Published January 2014.Originallyapproved in 1954.Last previous edition approved in 2006 as C341/C341M 065.DOI:10.1520/C0341_C0341M-13.2For 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 5.1.2 Gauge Studs on Sides of SpecimenWhen the com-parator is to be used to measure between gauge studs on thesides of specimens,the contact terminals shall be conical,heat-treated surfaces as shown in Fig.1,which illustrates atype of comparator that has been found satisfactory for thistype of specimen.In this case,the gauge length shall be thedistance between the reference points located in the exposedends of the gauge studs(see 5.2).5.2 Gauge StudsGauge studs shall be Type 316 stainlesssteel,meeting Specification A276.5.2.1 For Ends of Specimens