EN 12390-3:2001
(Main)Testing hardened concrete - Part 3: Compressive strength of test specimens
Testing hardened concrete - Part 3: Compressive strength of test specimens
This standard specifies a method for the determination of the compressive strength of test specimens of hardened concrete.
Prüfung von Festbeton - Teil 3: Druckfestigkeit von Probekörpern
Die vorliegende Norm beschreibt ein Verfahren für die Bestimmung der Druckfestigkeit von Probekörpern aus Festbeton.
Essais pour béton durci - Partie 3: Résistance à la compression des éprouvettes
La présente norme spécifie une méthode de détermination de la résistance en compression d'éprouvettes de béton durci.
Preskušanje strjenega betona - 3. del: Tlačna trdnost preskušancev
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.YPrüfung von Festbeton - Teil 3: Druckfestigkeit von ProbekörpernEssais pour béton durci - Partie 3: Résistance a la compression des éprouvettesTesting hardened concrete - Part 3: Compressive strength of test specimens91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:Ta slovenski standard je istoveten z:EN 12390-3:2001SIST EN 12390-3:2002en01-maj-2002SIST EN 12390-3:2002SLOVENSKI
STANDARD
SIST EN 12390-3:2002
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12390-3December 2001ICS 91.100.30English versionTesting hardened concrete - Part 3: Compressive strength oftest specimensEssais pour béton durci - Partie 3: Résistance à lacompression des éprouvettesPrüfung von Festbeton - Teil 3: Druckfestigkeit vonProbekörpernThis European Standard was approved by CEN on 2 September 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12390-3:2001 ESIST EN 12390-3:2002
EN 12390-3:2001 (E)2Contentspage1Scope.42Normative references.43Principle.44Apparatus.45Test specimens.46Procedure.57Expression of results.68Test report.69Precision.9Annex A (normative)
Adjustment of test specimens.10Annex B (normative)
Procedure for testing specimens with dimensions which are outside thetolerances of the designated sizes of EN 12390-1.14FiguresFigure 1 — Satisfactory failures of cube specimens.7Figure 2 — Some unsatisfactory failures of cube specimens.7Figure 3 — Satisfactory failure of cylinder specimen.8Figure 4 — Some unsatisfactory failures of cylinder specimens.8Figure A.1 — Capping: Sandbox method.13Figure A.2 — Detail of sandbox.13Figure A.3 — Positioning frame.13Figure B.1 — Dotted lines showing measuring positions for the loading faces of cubes.15Figure B.2 — Dotted lines showing measuring positions for the non-loaded faces of cubes.15Figure B.3 — Dotted lines showing the measuring positions for the ends of a cylinder.15Figure B.4 — Dotted lines showing the measuring positions for the height of a cylinder.15TablesTable 1 — Precision data for measurements of the compressive strength of hardened concrete,expressed as percentages of the mean of the two cube strengths whose difference is to becompared with repeatability (r) or reproducibility (R).9Table 2 — Precision data for measurements of the compressive strength of hardened concrete,expressed as percentages of the mean of the three cylinder strengths whose differences areto be compared with repeatability (r) or reproducibility (R).9Table A.1 — Restrictions on methods of adjustment.10SIST EN 12390-3:2002
EN 12390-3:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN /TC 104, "Concrete", the secretariat ofwhich is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2002, and conflicting national standards shall be withdrawn at the latest byDecember 2003.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.This standard is based on the draft International Standard ISO 4012 — Concrete — Determination of compressivestrength of test specimens.It is recognised good practice to include measurement of density prior to the determination of compressivestrength.The methods for adjusting the ends of test specimens, given in annex A, have been validated in a recent laboratoryinter-comparison, part-funded by the EC under the Measurement and Testing Programme, contract MATI-CT-94-0043.A draft for this standard was published in 1996 for CEN enquiry as prEN 12394. It was one of a series ofindividually numbered test methods for fresh or hardened concrete. For convenience it has now been decided tocombine these separate draft standards into three new standards with separate parts for each method, as follows: Testing fresh concrete (EN 12350) Testing hardened concrete (EN 12390) Testing concrete in structures (EN 12504)The series EN 12390 includes the following parts where the brackets give the numbers under which particular testmethods were published for CEN enquiry:EN 12390
Testing hardened concretePart 1:Shape, dimensions and other requirements for specimens and moulds (former prEN 12356:1996)Part 2:Making and curing specimens for strength tests (former prEN 12379:1996)Part 3:Compressive strength of test specimens (former prEN 12394:1996)Part 4:Compressive strength — Specification for testing machines (former prEN 12390:1996)Part 5:Flexural strength of test specimens (former prEN 12359:1996)Part 6:Tensile splitting strength of test specimens (former prEN 12362:1996)Part 7:Density of hardened concrete (former prEN 12363:1996)Part 8:Depth of penetration of water under pressure (former prEN 12364:1996)SIST EN 12390-3:2002
EN 12390-3:2001 (E)4The annexes A and B are normative.1 ScopeThis standard specifies a method for the determination of the compressive strength of test specimens of hardenedconcrete.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. For datedreferences, subsequent amendments to or revisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references the latest edition of the publication referredto applies (including amendments).EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements.EN 12350-1, Testing fresh concrete — Part 1: Sampling.EN 12390-1, Testing hardened concrete — Part 1: Shape, dimensions and other requirements for specimens andmoulds.EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests.EN 12390-4, Testing hardened concrete — Part 4: Compressive strength — Specification for testing machines.EN 12504-1, Testing concrete in structures — Part 1: Cored specimens — Taking, examining and testing incompression.ISO 3310-1, Test sieves; technical requirements and testing — Part 1: Test sieves of metal wire cloth.ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General principlesand definitions.Series BS 1881, Testing concrete3 PrincipleSpecimens are loaded to failure in a compression testing machine conforming to EN 12390-4. The maximum loadsustained by the specimen is recorded and the compressive strength of the concrete is calculated.4 ApparatusCompression testing machine, conforming to EN 12390-4.5 Test specimens5.1 RequirementThe test specimen shall be a cube, cylinder or core meeting the requirements of EN 12350-1, EN 12390-1,EN 12390-2, or EN 12504-1. If the dimension of the test specimen does not conform to the tolerances for designatedsize in EN 12390-1, it can be tested in accordance with the procedure given in annex B.NOTEDamaged specimens or specimens which are badly honeycombed should not be tested.SIST EN 12390-3:2002
EN 12390-3:2001 (E)55.2 Adjustment of test specimensWhere the dimensions or shapes of test specimens do not conform to the requirements given in EN 12390-1 becausethey exceed the respective tolerances, they shall be rejected, adjusted or tested in accordance with annex B.One of the methods given in annex A shall be used to adjust specimens.6 Procedure6.1 Specimen preparation and positioningWipe the excess moisture from the surface of the specimen before placing in the testing machine.Wipe all testing machine bearing surfaces
clean and remove any loose grit or other extraneous material from thesurfaces of the specimen that will be in contact with the platens.Do not use packing, other than auxiliary platens or
spacing blocks (see EN 12390-4) between the specimen and theplatens of the testing machine.Position the cube specimens that the load is applied perpendicularly to the direction of casting.Centre the specimen with respect to the lower platen to an accuracy of ± 1 % of the designated size of cubic, ordesignated diameter of cylindrical specimens.If auxiliary platens are used, align them with the top and bottom face of the specimen.With two-column testing machines, cubic specimens should be placed with the trowelled surface facing a column.6.2 LoadingSelect a constant rate of loading within the range 0,2 MPa/s (N/mm2
s) to 1,0 MPa/s (N/mm2
s). Apply the load tothe specimen without shock and increase continuously, at the selected constant rate ± 10 %, until no greater load canbe sustained.When using manually controlled testing machines, correct any tendency for the selected rate of loading to decrease,as specimen failure is approached by appropriate adjustment of the controls.Record the maximum load indicated.6.3 Assessment of type of failureExamples of the failure of specimen showing that the tests have proceeded satisfactorily are given in figure 1 forcubes and in figure 3 for cylinders.Examples for unsatisfactory failure of specimens are shown in figure 2 for cubes and in figure 4 for cylinders.If failure is unsatisfactory this shall be recorded with reference to the pattern letter according to figure 2 or 4 closest tothat observed.NOTEUnsatisfactory failures can be caused by: insufficient attention to testing procedures, especially positioning of the specimen; a fault with the testing machine.For cylindrical specimens, failure of the capping before the concrete is an unsatisfactory failure.SIST EN 12390-3:2002
EN 12390-3:2001 (E)67 Expression of resultsThe compressive strength is given by the equation:ccAFfwherefcis the compressive strength, in megapascals (newtons per square millimetre);Fis the maximum load at failure, in newtons;Acis the cross-sectional area of the specimen on which the compressive force acts, calculated from thedesignated size of the specimen (see EN 12390-1) or from measurements on the specimen according toannex B in mm2.The compressive strength shall be expressed to the nearest 0,5 MPa (N/mm2).8 Test reportThe report shall include:a) identification of the test specimen;b) designated dimensions of the specimen or if oversize and tested in accordance with Annex B, actualdimensions;c) surface condition of the specimen at the time of test;d) details of adjustment by grinding/capping (if appropriate);e) date of test;f) maximum load at failure, in kilonewtons;g) compressive strength of specimen in megapascals (to the nearest 0,5 MPa) or newtons per square millimetre
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