ASTM_C_470_-_C_470M_-_15.pdf

Designation:C470/C470M15Standard Specification forMolds for Forming Concrete Test Cylinders Vertically1This standard is issued under the fixed designation C470/C470M;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 U.S.Department of Defense.1.Scope*1.1 This specification covers molds for use in formingcylindrical concrete specimens.The provisions of this specifi-cation include the requirements for both reusable and single-use molds.NOTE1Sizes included are molds having diameters from 50 mm 2 in.to 900 mm 36 in.1.2 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.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.The inch-pound units are shown in brackets.1.4 The following safety hazards caveat pertains only to thetest method described in this specification:This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC33 Specification for Concrete AggregatesC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC1077 Practice for Agencies Testing Concrete and ConcreteAggregates for Use in Construction and Criteria forTesting Agency EvaluationD256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD570 Test Method for Water Absorption of Plastics3.General Requirements3.1 The following provisions apply to both reusable andsingle-use molds:3.1.1 Molds shall be constructed in the form of right circularcylinders which stand with the cylindrical axis vertical and thetop open to receive the concrete.They shall be made ofmaterials that do not react with concrete containing portland orother hydraulic cements.They shall be watertight and suffi-ciently strong and tough to permit their use without tearing,crushing,or deforming.NOTE2Reusable lids may be used on molds to reduce moisture loss.3.1.2 Molds shall have a nominal inside height equal totwice the nominal inside diameter.The diameter of a mold,consisting of the average of two measurements taken at rightangles to each other at the top of the mold,shall not differ fromthe nominal diameter by more than 1%.The height,deter-mined by averaging two measurements taken 180 apart,shallnot differ from the nominal height by more than 2%.Theplanes of the top rim of the mold and the bottom shall beperpendicular to the axis of the mold within 0.5 degreesapproximately equivalent to 3 mm in 300 mm 18in.in 12 in.No diameter of a mold shall differ from any other diameter ofthe same mold by more than 2%except that molds that fail tomeet this requirement may be used when the user is able todemonstrate that no diameter of hardened concrete specimenproduced in a similar mold differs from any other diameter onthe same specimen by more than 2%(see Note 3).NOTE3Certain single-use molds may require the use of a specialdevice such as a tube of heavy-gage metal around the mold duringmolding to maintain the dimensional tolerances specified in 3.1.2.3.1.3 The bottom inside surface of the mold shall not departfrom a plane by more than 2 mm in 150 mm 116in.in 6 in.(1%of the diameter of the mold).1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.61 on Testing for Strength.Current edition approved Feb.1,2015.Published March 2015.Originallyapproved in 1961.Last previous edition approved in 2009 as C470/C470M 09.DOI:10.1520/C0470_C0470M-15.2For 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 4.Reusable Molds4.1 Reusable molds are those which are designed to be usedmore than a single time.Reusable molds shall be made ofnonabsorptive materials,and constructed as either