1、Designation: C873/C873M 10Standard 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 re
2、vision, 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 Department of Defense.1. Scope*1.1 This test method
3、 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-
4、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
5、 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 mi
6、xtures 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 Cy-lindrical Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of Concret
7、eC470/C470M Specification for Molds for Forming Con-crete Test 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 inDeterminatio
8、n of Compressive Strength of Hardened Con-crete Cylinders3. Summary of Test Method3.1 A concrete 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
9、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 place
10、ment. 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 calculati
11、on 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,
12、 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 be1Thi
13、s 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 June 15, 2010. Published July 2010. Originallyapproved in 1977. Last previous edition approved in 2
14、004 as C873/C873M04e1.DOI: 10.1520/C0873_C0873M-10.2Section 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 Bo
15、ok of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.expected to be
16、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 capacityof slabs, determining the time of form and shore removal, anddeter
17、mining 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 (L/D) of the specimen after capping shall not beless than 1.0 (see Note 1). Molds (inner member) shall beconst
18、ructed in one piece in the form of right circular cylindersat least 100 mm 4 in. in inside diameter with the average4Bloem, D. L., “Concrete Strength in Structures,” Journal of the AmericanConcrete Institute, JACIA, March 1968, or ACI Proceedings, PACIA, Vol. 65, No.3, pp. 169248.FIG. 1 Schematic of
19、 Cast-in-Place Cylinder Mold AssemblyC873/C873M 102diameter not differing from the nominal diameter by more than1 % and no individual diameter differing from any otherdiameter by more than 2 %. The plane of the rim of the moldand the bottom shall be perpendicular to the axis of the moldwithin 0.5 (a
20、pproximately equivalent to 18 in. in 1 mm in100 mm 12 in.).NOTE 1The length-diameter ratio should preferably be between 1.5and 2.0.5.2 Molds shall be watertight and meet the criteria of thesection on water leakage of Specification C470/C470M. Moldsand auxiliary apparatus shall be made of nonabsorben
21、t materialthat does not react with concrete containing portland or otherhydraulic cements. They shall be sufficiently strong and toughto permit use under normal construction conditions withouttearing, crushing, or otherwise deforming permanently whenfilled with fresh concrete. They shall resist perm
22、anent defor-mation to the extent that they produce hardened concretecylinders such that two diameters measured at right angles toeach other in any horizontal plane do not differ by more than2.0 mm 116 in.5.3 The exterior top of the mold shall have outwardlyextending centering knobs and an annular fl
23、ange to rest on topof the support member (5.4) and to seal the annular ring spacebetween the mold and that support member. Means for twistingand vertical withdrawal of molds from the support membershall be provided in the annular flange (see Fig. 1).5.4 Support members shall be right circular cylind
24、ers andshall be rigid tubes of diameter required to accommodatemolds stipulated in 5.1 and to concentrically contact andsupport the annular flange of the mold. Support members shallbe provided with a means for height adjustment and shall befitted with exterior means to permit nailing or other firmat
25、tachment to slab forms in a manner preventing entry ofconcrete or mortar into the annular ring space between thesupport member and the mold.6. Installation of Apparatus6.1 After completion of reinforcing steel placement andother formwork preparation, fasten the support member to slabforms using nail
26、s or screws. Adjust the support member so thatthe top of the mold is aligned with the elevation of screedguides used in striking off the concrete.NOTE 2The location of mold assemblies should be noted on projectdrawings for easy location after concrete placement and for identification.6.2 Place the m
27、old in the support member so that the flangeof the mold is uniformly supported by the sleeve to preventconcrete or mortar from penetrating into the space between themold and support member.NOTE 3Insertion of compressible material between the support mem-ber and the mold is permitted to prevent morta
28、r seepage into the annularspace.7. Procedure7.1 Inspect the molds to ensure they are clean and free ofany debris or foreign matter. Fill the molds when the concreteplacement progresses to the vicinity of mold location.7.2 Consolidation of concrete in the mold may be varied tosimulate the conditions
29、of placement. In normal field construc-tion practice, if the surrounding concrete is consolidated byinternal vibration, use the vibrator externally, briefly touchingthe exterior of the mold support member. Internal vibration ofconcrete in the mold is prohibited except under specialcircumstances, whi
30、ch shall be explained in the report of testresults. Subject the specimen surface to the same finishing asthe surrounding concrete.7.3 Curing of SpecimensSubject the specimens to thesame curing and treatment as provided to the surroundingconcrete. Record maximum and minimum slab surface tem-peratures
31、 during the curing period for inclusion in the report.Specimen molds shall remain fully seated in place until time ofremoval for transportation to the testing location.7.4 Remove molds from support members, exercising careso as not to physically damage specimens. From the time ofremoval from the str
32、ucture until time of test, maintain testspecimens at a temperature within 66C610 F of the slabsurface temperature at the time of removal. Transport speci-mens to the laboratory within 4 h after removal. Duringtransportation protect the specimens with suitable material toprevent damage from jarring,
33、freezing temperatures or mois-ture loss, or combination thereof.7.5 Testing of SpecimensRemove specimens from molds.Determine the average diameter of each specimen to thenearest 0.2 mm 0.01 in. by averaging two diameters mea-sured at right angles to each other at about the midheight of thespecimen.
34、Cap specimens in accordance with Practice C617and measure the length of the capped specimens to the nearest2 mm 0.1 in. Alternatively, measure the length of thespecimens to the nearest 2 mm 0.1 in. and use unbonded capsin accordance with Practice C1231/C1231M. Test the speci-mens in accordance with
35、Test Method C39/C39M. Test thespecimens for compressive strength in the “as-received” mois-ture condition unless required otherwise by project specifica-tions.8. Calculation8.1 Calculate the compressive strength of each specimenusing the computed cross-sectional area based on the averagediameter of
36、the specimen. If the length-diameter ratio of thespecimen is 1.75 or less, correct the calculated strength bymultiplying by the applicable strength correction factor givenin Test Method C42/C42M.9. Report9.1 Report the following information:9.1.1 Identification of structure in which specimens wereca
37、st, identification of specimen, and location of the mold in thestructure,9.1.2 Diameter and length, mm in.,9.1.3 Maximum load, N lbf,9.1.4 The L/D strength correction factor used,9.1.5 Compressive strength calculated to the nearest 10 psi0.1 MPa after multiplying by the applicable L/D strengthcorrec
38、tion factor, if required,9.1.6 Type of fracture (see Test Method C39/C39M),9.1.7 Defects in specimen, or caps, if observed,9.1.8 Age of specimen,9.1.9 Curing methods used,C873/C873M 1039.1.10 Initial concrete temperature,9.1.11 Maximum and minimum temperature informationobtained at job site to defin
39、e curing conditions of specimens inplace,9.1.12 Detailed descriptions of any internal vibration orother internal manipulations of the fresh concrete in the mold(7.2), and9.1.13 Other information pertaining to job conditions thatcould affect the results.10. Precision and Bias10.1 PrecisionThe single-
40、operator coefficient of variationhas been found to be 3.5 %5for a range of compressivestrength between 10 and 41 MPa 1500 and 6000 psi.6Therefore, results of two properly conducted tests by the sameoperator on the same sample of concrete should not differ fromeach other by more than 10.0 %5of their
41、average. Largerdifferences may be due to improperly prepared specimens oractual strength differences because of different batches ofconcrete or different curing conditions.10.2 BiasThe bias of this test method cannot be deter-mined because the strength of a cast-in-place cylindricalspecimen can only
42、 be obtained by using this test method.11. Keywords11.1 compressive strength; concrete; cylinder molds; in-place strengthSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C873/C873M04e1, that may impact the use of this test metho
43、d. (Approved June 15, 2010.)(1) The order of the inch-pound and SI units was reversed.(2) Minor revisions were made to 3.1 to improve clarity.(3) Minor revisions were made to 4.1 to clarify the intent ofthe second sentence.(4) A new Note 1 was added to remove non-mandatory textfrom the body of the s
44、tandard.(5) A minor revision was made to 5.2 to clarify that the intentis to prevent permanent distortion of the molds.(6) Additional text was added to 5.3 to clarify how the moldsare used.(7)In5.4, the reference to attaching molds to reinforcing steelwas removed because this is not done in practice
45、.(8) Minor changes were made to 6.1 and the last sentence wasmoved to a new Note 2.(9) 7.5 was revised to permit the use of unbonded caps.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this st
46、andard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years a
47、ndif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,
48、 which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
49、59,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).5These numbers represent, respectively, the (1s %) and (d2s %) limits asdescribed in Practice C670.6This statement was derived from research data reported by Nicholas J. Ca
