ASTM_C_143_-_C_143M_-_15a.pdf

Designation:C143/C143M15aStandard Test Method forSlump of Hydraulic-Cement Concrete1This standard is issued under the fixed designation C143/C143M;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 test method covers determination of slump ofhydraulic-cement concrete,both in the laboratory and in thefield.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.3 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.1.4 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 FieldC138/C138M Test Method for Density(Unit Weight),Yield,and Air Content(Gravimetric)of ConcreteC172 Practice for Sampling Freshly Mixed ConcreteC173/C173M Test Method forAir Content of Freshly MixedConcrete by the Volumetric MethodC231 Test Method for Air Content of Freshly Mixed Con-crete by the Pressure MethodC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD638 Test Method for Tensile Properties of Plastics3.Summary of Test Method3.1 A sample of freshly mixed concrete is placed andcompacted by rodding in a mold shaped as the frustum of acone.The mold is raised,and the concrete allowed to subside.The vertical distance between the original and displacedposition of the center of the top surface of the concrete ismeasured and reported as the slump of the concrete.4.Significance and Use4.1 This test method is intended to provide the user with aprocedure to determine slump of plastic hydraulic-cementconcretes.NOTE1This test method was originally developed to provide atechnique to monitor the consistency of unhardened concrete.Underlaboratory conditions,with strict control of all concrete materials,theslump is generally found to increase proportionally with the water contentof a given concrete mixture,and thus to be inversely related to concretestrength.Under field conditions,however,such a strength relationship isnot clearly and consistently shown.Care should therefore be taken inrelating slump results obtained under field conditions to strength.4.2 This test method is considered applicable to plasticconcrete having coarse aggregate up to 112in.37.5 mm insize.If the coarse aggregate is larger than 112in.37.5 mm insize,the test method is applicable when it is performed on thefraction of concrete passing a 112-in.37.5-mm sieve,with thelarger aggregate being removed in accordance with the sectiontitled“Additional Procedure for Large Maximum Size Aggre-gate Concrete”in Practice C172.4.3 This test method is not considered applicable to non-plastic and non-cohesive concrete.NOTE2Concretes having slumps less than12in.15 mm may not beadequately plastic and concretes having slumps greater than about 9 in.230 mm may not be adequately cohesive for this test to have signifi-cance.Caution should be exercised in interpreting such results.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.60 on Testing Fresh Concrete.Current edition approved Dec.15,2015.Published February 2016.Originallyapproved in 1922.Last previous edition approved in 2015 as C143/C143M 15.DOI:10.1520/C0143_C0143M-15A2Section 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.*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.Apparatus5.1 MoldThe test specimen shall be formed in a mol