EN 12390-3:2009

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 à 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 12390-3:2009SIST EN 12390-3:2009en,fr,de01-julij-2009SIST EN 12390-3:2009SLOVENSKI
STANDARDSIST EN 12390-3:20021DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12390-3February 2009ICS 91.100.30Supersedes EN 12390-3:2001
English 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 27 December 2008.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12390-3:2009: ESIST EN 12390-3:2009

Adjustment of test specimens . 11 Annex B (normative)
Procedure for testing specimens with dimensions which are outside the tolerances of the designated sizes of EN 12390-1 . 16 Bibliography . 19
Part 1: Shape, dimensions and other requirements for specimens and moulds; Part 2: Making and curing specimens for strength tests;
Part 3: Compressive strength of test specimens;
Part 4: Compressive strength - Specification for testing machines;
Part 5: Flexural strength of test specimens;
Part 6: Tensile splitting strength of test specimens;
Part 7: Density of hardened concrete;
Part 8: Depth of penetration of water under pressure.
The following amendments have been made to the 2001-12 edition of this standard:  editorial revision  the compressive strength to be expressed to the nearest 0,1 MPA (N/mm²) instead of 0,5 MPa (N/mm²)  the loading rate has been changed from between 0,2 MPa/s and 1,0 MPa/s to 0,6 ± 0,2 MPa/s  the allowable tolerance for specimens which do not meet the tolerance given in EN 12390-1 for designated size has been increased SIST EN 12390-3:2009

1 Scope This European Standard specifies a method for the determination of the compressive strength of test specimens of hardened concrete. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 and moulds 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 in compression ISO 3310-1, Test sieves; technical requirements and testing — Part 1: Test sieves of metal wire cloth 3 Principle Specimens are loaded to failure in a compression testing machine conforming to EN 12390-4. The maximum load sustained by the specimen is recorded and the compressive strength of the concrete is calculated. 4 Apparatus Compression testing machine, conforming to EN 12390-4. 5 Test specimens 5.1 Requirement The 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 designated size in EN 12390-1, it can be tested in accordance with the procedure given in Annex B. NOTE Damaged specimens or specimens which are badly honeycombed should not be tested. SIST EN 12390-3:2009

EN 12390-1 because they 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 Procedure 6.1 Specimen preparation and positioning Wipe all testing machine bearing surfaces clean and remove any loose grit or other extraneous material from the surfaces 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 the platens of the testing machine. Wipe the excess moisture from the surface of the specimen before placing in the testing machine. Position the cube specimens so 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, or designated 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 Loading Select a constant rate of loading within the range 0,6 ± 0,2 MPa/s (N/mm²·s).
After the application of the initial load, which does not exceed approximately 30% of the failure load, apply the load to the specimen without shock and increase continuously at the selected constant rate ± 10 %, until no greater load can be 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 in kN.
NOTE Further guidance on loading rates for high and low strength concrete e.g. above 80 MPa and below 20 MPa cube strengths, may be given in national Annex NA
6.3 Assessment of type of failure Examples of the failure of specimen showing that the tests have proceeded satisfactorily are given in Figure 1 for cubes 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 to that observed. NOTE Unsatisfactory failures can be caused by: SIST EN 12390-3:2009

ccFfA= where fc
is the compressive strength, in MPa (N/mm²);
F
is the maximum load at failure, in N; Ac is the cross-sectional area of the specimen on which the compressive force acts, calculated from the designated size of the specimen (see EN 12390-1) or from measurements on the specimen if tested according to Annex B, in mm2. The compressive strength shall be expressed to the nearest 0,1 MPa (N/mm²). 8 Test report The report shall include: a) identification of the test specimen; b) designated dimensions of the specimen or if tested in accordance with Annex B, actual dimensions; c) details of adjustment by grinding/capping (if appropriate); d) date of test; e) maximum load at failure, in kN; f) compressive strength of specimen, to the nearest 0,1 MPa (N/mm²); g) unsatisfactory failure (if appropriate) and if unsatisfactory the closest type; h) any deviations from the standard method of testing; i) a declaration from the person technically responsible for the test that it was carried out in accordance with this document, except as detailed in item h). The report may include: j) mass of the specimen; k) apparent density of specimen, to the nearest 10 kg/m3; l) condition of the specimen on receipt; SIST EN 12390-3:2009

Explosive failure NOTE All four exposed faces are cracked approximately equally, generally with little damage to faces in contact with the platens. Figure 1 — Satisfactory failures of cube specimens
NOTE T = tensile crack Figure 2 — Some unsatisfactory failures of cube specimens SIST EN 12390-3:2009

Figure 3 — Satisfactory failure of cylinder specimen
Figure 4 — Some unsatisfactory failures of cylinder specimens SIST EN 12390-3:2009

Repeatability conditions Reproducibility conditions sr % r % sR % R % 100 mm cubes 150 mm cubes 3,2 3,2 9,0 9,0 5,4 4,7 15,1 13,2 NOTE 1 The precision data were determined as part of an experiment carried out in 1987 in which precision data were obtained for several of the tests described in BS 1881. The experiment involved 16 operators. The concretes were made using an ordinary Portland cement, Thames Valley sand, and Thames Valley 10 mm and 20 mm coarse aggregates. NOTE 2 The difference between two test results from the same sample by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability value r on average not more than once in 20 cases in the normal and correct operation of the method. NOTE 3 Test results on the same sample obtained within the shortest feasible time interval by two operators each using their own apparatus will differ by the reproducibility value R on average not more than once in 20 cases in the normal and correct operation of the method.
NOTE 4 For further information on precision, and for definitions of the statistical terms used in connection with precision, see ISO 5725-1
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