SIST EN 12390-13:2014
(Main)Testing hardened concrete - Part 13: Determination of secant modulus of elasticity in compression
Testing hardened concrete - Part 13: Determination of secant modulus of elasticity in compression
This European Standard specifies the method for the determination of the secant modulus of elasticity in compression of hardened concrete on test specimens which may be cast or taken from a structure. The test method allows the determination of two secant moduli of elasticity: the initial modulus, EC,0 measured at first loading and the stabilized modulus, EC,S measured after three loading cycles. Two different test methods are given. The first (method A) is for determination of both initial and stabilized moduli, the second (method B) is for determination of stabilized modulus only.
Prüfung von Festbeton - Teil 13: Bestimmung des Elastizitätsmoduls unter Druckbelastung (Sekantenmodul)
Diese Norm legt ein Verfahren zur Bestimmung des Elastizitätsmoduls von Festbeton als Sekantenmodul unter Druckbelastung mit Verwendung von in Form hergestellten oder aus Bauwerken entnommenen Probekörpern fest.
Essai pour béton durci - Partie 13: Détermination du module sécant d'élasticité en compression
La présente norme spécifie un mode opératoire de détermination du module sécant d’élasticité en compression du béton durci, en utilisant des éprouvettes pouvant avoir été moulées ou prélevées dans une structure.
Preskušanje strjenega betona - 13. del: Določanje sekantnega modula elastičnosti pri tlačni obremenitvi
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prüfung von Festbeton - Teil 13: Bestimmung des Elastizitätsmoduls unter Druckbelastung (Sekantenmodul)Essai pour béton durci - Partie 13: Détermination du module sécant d'élasticité en compressionTesting hardened concrete - Part 13: Determination of secant modulus of elasticity in compression91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:Ta slovenski standard je istoveten z:EN 12390-13:2013SIST EN 12390-13:2014en,fr,de01-april-2014SIST EN 12390-13:2014SLOVENSKI
STANDARD
SIST EN 12390-13:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12390-13
October 2013 ICS 91.100.30 English Version
Testing hardened concrete - Part 13: Determination of secant modulus of elasticity in compression
Essais pour béton durci - Partie 13: Détermination du module sécant d'élasticité en compression
Prüfung von Festbeton - Teil 13: Bestimmung des Elastizitätsmoduls unter Druckbelastung (Sekantenmodul)This European Standard was approved by CEN on 21 September 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-13:2013 ESIST EN 12390-13:2014
EN 12390-13:2013 (E) 2 Contents Page Foreword .3 1 Scope .4 2 Normative references .4 3 Terms and definitions, symbols and scripts .4 4 Principle .6 5 Apparatus .6 6 Test specimens .7 7 Method .7 8 Calculation of secant modulus of elasticity . 12 9 Test report . 13 10 Precision . 13 Bibliography . 14
SIST EN 12390-13:2014
EN 12390-13:2013 (E) 3 Foreword This document (EN 12390-13:2013) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2014, and conflicting national standards shall be withdrawn at the latest by April 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. It is based on an extensive investigation and comparison of existing National Standards: ASTM, BS, DIN, ISO, NORD TEST and UNI followed by the analysis of a test programme involving five laboratories carried out by UNI.
This standard is one of a series concerned with testing concrete. The series EN 12390, Testing hardened concrete, consists of the following parts: Part 1: Shape, dimensions and other requirements of 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 Part 13: Determination of secant modulus of elasticity in compression According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 12390-13:2014
EN 12390-13:2013 (E) 4 1 Scope This European Standard specifies the method for the determination of the secant modulus of elasticity in compression of hardened concrete on test specimens which may be cast or taken from a structure. The test method allows the determination of two secant moduli of elasticity: the initial modulus, EC,0 measured at first loading and the stabilized modulus, EC,S measured after three loading cycles. Two different test methods are given. The first (method A) is for determination of both initial and stabilized moduli, the second (method B) is for determination of stabilized modulus only. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12390-1, Testing hardened concrete — Part 1: Shape, dimensions and other requirements of specimens and moulds EN 12390-2, Testing hardened concrete — Part 2: Making and curing specimens for strength tests EN 12390-3, Testing hardened concrete — Part 3: Compressive strength of test specimens EN 12390-4, Testing hardened concrete — Part 4: Compressive strength – Specification for testing machines EN 12504-1:2009, Testing concrete in structures — Part 1: Cored specimens – Taking, examining and testing in compression EN ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing (ISO 9513) 3 Terms and definitions, symbols and scripts 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 initial secant modulus of elasticity
EC,0
secant slope of the stress strain curve at first loading 3.1.2 stabilized secant modulus of elasticity
EC,S
secant slope of the stress strain curve after three loading cycles 3.1.3 base or gauge length length used as reference base for strain measurement 3.1.4 measuring line straight line laying on the lateral surface of the specimen and parallel to the vertical axis (see Figure 1) SIST EN 12390-13:2014
EN 12390-13:2013 (E) 5
Key 1 measuring line Figure 1 — Measuring line on cylinder and prismatic specimens 3.2 Symbols and scripts For the purposes of this European Standard, the symbols and scripts in Table 1 apply. Table 1 — Symbols and scripts (1 of 2) Symbol Explanation EC,0
Initial secant modulus of elasticity EC,S Stabilized secant modulus of elasticity ε =Measured strain ∆L =Change in measured length L0
Initial gauge length of instrument L Specimen length d
Specimen diameter or width D Upper sieve size (for definition of aggregates size, see EN 12620) Dmax
Declared value of D of the coarsest fraction of aggregates actually used in the concrete fc Compressive strength of concrete determined by testing companion specimens – cylinders, prisms, cubes or cores – or estimated from non-destructive tests σa =Nominal upper stress = fc / 3 σb Nominal lower stress – arbitrary value between 10 % and 15 % of fc σp Nominal preload stress – arbitrary value between 0,5 MPa and σb εa =Strain along each measuring line at upper stress εb Strain along each measuring line at lower stress εp Strain along each measuring line at preload stress εa, n Average strain at upper stress on loading cycle n
εb, n Average strain at lower stress on loading cycle n
SIST EN 12390-13:2014
EN 12390-13:2013 (E) 6 Table 1 (2 of 2) Symbol Explanation εp, n Average strain at preload stress on loading cycle n maσ Measured stress corresponding to nominal upper stress, σa mbσ=Measured stress corresponding to nominal lower stress,=σb mpσ=Measured stress corresponding to nominal preload stress,=σp ∆σ =Difference between measured stresses maσ and mbσ (Method A) or maσ and mpσ (Method B) ∆ε0 =Strain difference during first loading cycle ∆εs Strain difference during third loading cycle 4 Principle A test specimen is loaded under axial compression, the stresses and strains are recorded and the slope of the secant to the stress-strain curve is determined at first loading (Method A only) and after three loading cycles (Methods A and B). The secant slope is known as the secant modulus of elasticity in compression. The test specimens may be either cast or taken from an existing structure. 5 Apparatus 5.1 Test machine Compression testing machine conforming to EN 12390-4 with following additional requirements: a) suitable for execution of programmable loading cycles; b) able to increase and decrease the load at a constant rate within a given tolerance (see 7.3.1 and 7.3.2); c) able to maintain a constant load at selectable nominal values with a maximum variation within ± 5 %; d) calibrated as Class 1 to EN 12390-4 over the working range from the lower stress to the upper stress as defined in 7.3.1 and 7.3.2 . NOTE The test lends itself to the use of automatic control test machines. However, if manual control test machines can be shown to comply with b), c) and d) above, they can be used. 5.2 Instrumentation Instrumentation measuring the strain of the specimen under axial compression along a measuring line shall be Class 2 as determined in accordance with EN ISO 9513 in the range from 0 µm/m to 1 000 µm/m. The instrumentation can measure strain directly (e.g. resistive strain gauges) or take the form of measuring length change from which the strain, ε, is calculated with the formula: 0LL∆ε= (1) SIST EN 12390-13:2014
EN 12390-13:2013 (E) 7 5.3 Base or gauge length The base or gauge length of the strain measuring instrument shall be between two-thirds of the specimen diameter (or section width) and one-half of the specimen length and not less than 3Dmax. NOTE For specimens where L/d is between 3,5 and 4,0, the gauge length can be increased to up to 2/3 of the specimen length. 6 Test specimens 6.1 Shape and dimensions of specimens The test specimens shall be moulded (cylinder or prism) or drilled cores complying with the requirements of EN 12390-1 or EN 12504-1. The dimension d (diameter or width) shall be at least 3,5 times Dmax. The ratio between the specimen length L and the dimension d shall be in the range 2 ≤ L/d ≤ 4.
The recommended test specimen shall be cylinders of diameter 150 mm and height 300 mm (reference specimen). Alternatively, other test specimens generally complying with the requirements of EN 12390-1 may be used, provided that the specimen complies with the dimensions and aggregate size to diameter or width stated above. In the case of specimens drilled or cut from a structure, this requirement sometimes cannot be fulfilled; in such cases, this shall be s
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