ASTM_C_873_-_C_873M_-_15.pdf

Designation:C873/C873M15Standard Test Method forCompressive Strength of Concrete Cylinders Cast in Placein Cylindrical Molds1This standard is issued under the fixed designation C873/C873M;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 test method covers the determination of strength ofcylindrical concrete specimens that have been molded in placeusing special molds attached to formwork.This test method islimited to use in slabs where the depth of concrete is from 125to 300 mm 5 to 12 in.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.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 consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.(WarningFresh hydraulic cementitious mixtures are causticand may cause chemical burns to skin and tissue uponprolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC470/C470M Specification for Molds for Forming ConcreteTest Cylinders VerticallyC617 Practice for Capping Cylindrical Concrete SpecimensC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1231/C1231M Practice for Use of Unbonded Caps inDetermination of Compressive Strength of Hardened Con-crete Cylinders3.Summary of Test Method3.1 Aconcrete cylinder mold assembly consisting of a moldand a tubular support member is fastened within the concreteformwork prior to placement of the concrete as shown in Fig.1.The elevation of the mold upper edge is adjusted tocorrespond to the level of the finished slab surface.The moldsupport prevents direct contact of the slab concrete with theoutside of the mold and permits easy removal of the mold fromthe slab.The mold is filled at the time its location is reached inthe normal course of concrete placement.The specimen in the“cured-in-place”condition is removed from its in-place loca-tion immediately prior to de-molding,capping,and testing.The reported compressive strength is corrected on the basis ofspecimen length-diameter ratio using correction factors pro-vided in the section on calculation of Test Method C42/C42M.4.Significance and Use4.1 Cast-in-place cylinder strength relates to the strength ofconcrete in the structure due to the similarity of curingconditions because the cylinder is cured within the slab.However,due to differences in moisture condition,degree ofconsolidation,specimen size,and length-diameter ratio,thereis not a unique relationship between the strength of cast-in-place cylinders and cores of the same age.When cores can bedrilled undamaged and tested in the same moisture condition asthe cast-in-place cylinders,the strength of the cylinders can beexpected to be on average 10%higher than the cores at agesup to 91 days for specimens of the same size and length-diameter ratio.44.2 Strength of cast-in-place cylinders may be used forvarious purposes,such as estimating the load-bearing capacity1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.61 on Testing for Strength.Current edition approved Dec.1,2015.Published February 2016.Originallyapproved in 1977.Last previous edition approved in 2010 as C873/C873M10a.DOI:10.1520/C0873_C0873M-15.2Section 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.4Bloem,D.L.,“Concrete Strength in Structures,”Journal of the AmericanConcrete Institute,JACIA,March 1968,or ACI Proceedings,PACIA,Vol.65,No.3,pp.169248.*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 of slabs,determining the time of form and shore removal,anddetermining the effectiveness of curing and protection.5.Apparatus5.1 Cast-in-place molds shall have a diameter at least threetimes the nominal maximum aggregate size.The length-diameter ratio