ASTM_C_174_-_C_174M_-_17.pdf

Designation:C174/C174M17American Association StateHighway and Transportation Officials StandardAASHTO No.:T 148Standard Test Method forMeasuring Thickness of Concrete Elements Using DrilledConcrete Cores1This standard is issued under the fixed designation C174/C174M;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 the determination of the thick-ness of a concrete pavement,slab,or structural element usingdrilling cores.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theinch-pound units are shown in brackets.The values stated ineach system are not exact equivalents;therefore,each systemshall be used independently of the other.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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materials2.2 AASHTO Standards:3AASHTO T148 Method of Test for Measuring Length ofDrilled Concrete Cores3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology C125.4.Significance and Use4.1 This test method is used to determine the compliance ofconcrete construction with design specifications and is com-monly used in determining the thickness of pavements andother slab construction.This test method requires that at leastone end of the core be a finished or formed surface.5.Apparatus5.1 The apparatus shall consist of a base plate with threeposts to support the core in a vertical direction,and top plate orother means of establishing a plane that is parallel to and ameasured distance from the plane defined by the supportingposts.The apparatus includes a measuring rod as described in5.5 or other means to determine the length of axial elements ofthe core.While the details of the mechanical design are notprescribed,the apparatus shall conform to the requirements of5.2 5.6.An example of an apparatus is illustrated in Fig.1.5.2 The base of the apparatus shall be so designed that thecore will be held with its axis in a vertical position by threesymmetrically placed supports bearing against the lower end ofthe core.These supports shall be short posts or studs ofhardened steel,and the ends that bear against the surface of thecore shall be rounded to a radius of not less than 6 mm 14in.and not more than 13 mm 12in.5.3 The apparatus shall provide for the accommodation ofcores of different nominal lengths over a range of at least 100to 250 mm 4 to 10 in.1This test method 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 May 1,2017.Published July 2017.Originally approvedin 1942.Last previous edition approved in 2016 as C174/C174M 16.DOI:10.1520/C0174_C0174M-17.2For 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.3Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.4 The top plate or other means of measuring shall be sodesigned that it will be possible to make a length measurementat the center of the upper end of the core,and at eightadditional points s