EN 13791:2019
(Main)Assessment of in-situ compressive strength in structures and precast concrete components
Assessment of in-situ compressive strength in structures and precast concrete components
(1) This document:
- gives methods and procedures for the estimation of the in situ compressive strength and characteristic in situ compressive strength of concrete in structures and precast concrete components using direct methods (core testing) and indirect methods, e.g. ultra-sonic pulse velocity, rebound number;
NOTE To align with the design standard EN 1992-1-1, where the compressive strength is based on 2:1 cylinders, the in situ compressive strength is based in 2:1 cores of diameter ≥ 75 mm.
- provides principles and guidance for establishing the relationships between test results from indirect test methods and the in situ compressive strength;
- provides procedures and guidance for assessing the conformity with the compressive strength class of concrete supplied to structures under construction where standard tests indicate doubt or where the quality of execution is in doubt.
(2) This document provides requirements for determining the in situ strength at test locations and the characteristic strength of test regions, but how this information is to be applied needs to be considered in the light of the specific situation and engineering judgement applied to the specific case.
(3) This document does not include the assessment of the quality of concrete for properties other than compressive strength, e.g. durability-related properties.
(4) This document is not for the assessment of conformity of concrete compressive strength in accordance with EN 206 or EN 13369, except as indicated in EN 206:2013+A1:2016, 5.5.1.2 or 8.4.
(5) This document does not cover the procedures or criteria for the routine conformity control of precast concrete components using either direct or indirect measurements of the in situ strength.
(3) This document does not include the assessment of the quality of concrete for properties other than compressive strength, e.g. durability-related properties.
(4) This document is not for the assessment of conformity of concrete compressive strength in accordance with EN 206 or EN 13369, except as indicated in EN 206:2013+A1:2016, 5.5.1.2 or 8.4.
(5) This document does not cover the procedures or criteria for the routine conformity control of precast concrete components using either direct or indirect measurements of the in-situ strength.
Bewertung der Druckfestigkeit von Beton in Bauwerken und in Bauwerksteilen
(1) Dieses Dokument:
- enthält Verfahren und Vorgehensweisen für die Abschätzung der Druckfestigkeit von Bauwerksbeton und der charakteristischen Druckfestigkeit des Betons in Bauwerken und Bauwerksteilen nach direkten Verfahren (Bohrkernprüfung) und indirekten Verfahren, z. B. Ultraschallgeschwindigkeit, Rückprallzahl;
ANMERKUNG In Anpassung an die Bemessungsnorm EN 1992 1 1, in der die Druckfestigkeit auf Zylindern im Verhältnis von 2:1 basiert, basiert die Druckfestigkeit von Bauwerksbeton auf 2:1-Bohrkernen mit einem Durch-messer ≥ 75 mm.
- enthält Grundsätze und Anleitungen zum Aufstellen der Beziehung zwischen den Prüfergebnissen indirekter Prüfverfahren und der Druckfestigkeit von Bauwerksbeton;
- stellt Verfahrensweisen und Anleitungen für die Bewertung der Übereinstimmung mit der Druckfestig¬keitsklasse von Beton bereit, der in im Bau befindliche Bauwerke eingebracht wurde, für den Fall, dass Standardprüfungen Zweifel hervorrufen oder die Ausführungsqualität in Zweifel steht.
(2) Das vorliegende Dokument legt Anforderungen an die Bestimmung der Druckfestigkeit von Bauwerksbeton an Messstellen und der charakteristischen Festigkeit von Prüfbereichen fest, wie diese Angaben jedoch anzuwenden sind, ist unter Berücksichtigung der konkreten Situation und nach ingenieurtechnischer Beurteilung zu betrachten.
(3) Das vorliegende Dokument umfasst nicht die Bewertung der Betonqualität in Bezug auf andere Eigenschaften als die Druckfestigkeit, wie z. B. auf dauerhaftigkeitsbezogene Eigenschaften.
(4) Dieses Dokument dient nicht der Bewertung der Übereinstimmung der Betondruckfestigkeit nach EN 206 oder EN 13369, es sei denn, dies ist nach EN 206:2013+A1:2016, 5.5.1.2 oder 8.4, angegeben.
(5) Das vorliegende Dokument deckt weder die Verfahrensweisen noch die Kriterien für die routinemäßige Konformitätskontrolle von Betonfertigteilen mit Hilfe entweder direkter oder indirekter Messungen der Festigkeit des Bauwerksbetons ab.
Évaluation de la résistance à la compression sur site des structures et des éléments préfabriqués en béton
(1) Le présent document :
fournit des méthodes et des procédures permettant d’estimer la résistance à la compression sur site et la résistance caractéristique à la compression sur site du béton dans les structures et les éléments préfabriqués en béton, à l’aide de méthodes directes (essais sur carottes) et de méthodes indirectes, par exemple vitesse de propagation du son, indice de rebondissement ;
NOTE Afin de s’aligner sur la norme de calcul EN 1992 1 1, où la résistance à la compression est basée sur des cylindres 2:1, la résistance à la compression sur site est basée sur des carottes 2:1 d’un diamètre ≥ 75 mm.
donne des principes et des recommandations pour l’établissement des relations entre les résultats de méthodes d’essai indirectes et la résistance à la compression sur site ;
fournit des procédures et des recommandations pour l’évaluation de la conformité à la classe de résistance à la compression d’un béton fourni à des structures en construction lorsque les essais normalisés indiquent un doute ou en cas de doute sur la qualité de l’exécution.
(2) Le présent document spécifie des exigences relatives à la détermination de la résistance sur site au niveau d’aires d’essai et de la résistance caractéristique de zones d’essai, mais la manière dont ces informations doivent être utilisées doit être considérée à la lumière de la situation spécifique et d’une expertise technique appliquée au cas particulier.
(3) Le présent document n’inclut pas l’évaluation de la qualité du béton pour des propriétés autres que la résistance à la compression, par exemple les propriétés liées à la durabilité.
(4) Le présent document ne traite pas de l’évaluation de la conformité de la résistance à la compression du béton selon l’EN 206 ou l’EN 13369, sauf pour les points évoqués dans l’EN 206:2013+A1:2016, 5.5.1.2 ou 8.4.
(5) Le présent document ne traite pas des procédures ou critères pour le contrôle courant de la conformité des éléments préfabriqués en béton par des mesurages directs ou indirects de la résistance sur site.
Ocenjevanje in-situ tlačne trdnosti betona v konstrukcijah in v montažnih betonskih elementih
Ta evropski standard:
– podaja metode in postopke za ocenjevanje tlačne trdnosti in-situ ter značilne in-situ tlačne trdnosti betona v konstrukcijah in montažnih betonskih elementih z uporabo neposrednih metod (preskušanje jedra) ter posrednih metod, npr. hitrost ultrazvočnega impulza, sklerometrični indeks;
– podaja načela in smernice za določitev razmerja med rezultati preskusov iz posrednih preskusnih metod ter in-situ tlačno trdnostjo;
– ponuja postopke in smernice za in-situ oceno razreda tlačne trdnosti betona, kadar obstaja dvom glede trdnosti betona, ki je bil pred kratkim uporabljen v konstrukciji, ali montažnega betonskega elementa.
Ta evropski standard ne zajema:
– ocene na osnovi jeder s premerom manj kot 50 mm, mikro jeder;
– ocene drugih lastnosti betona razen tlačne trdnosti, npr. lastnosti, povezane z vzdržljivostjo;
– posebnih določb za lahke vrste betona;
– uporabe izvlečnega preskušanja;
– (v postopkih točke 8) določb za manj kot 8 jeder brez posrednega preskušanja;
– uporabe primerjalnega preskušanja (za pojasnilo glej nadaljnja navodila CEN/TR za uporabo standarda EN 13791:2016 in ozadje določb [1]).
(2) Ta evropski standard se ne uporablja za ocenjevanje skladnosti tlačne trdnosti betona v skladu s standardom EN 206 ali EN 13369, razen kot je navedeno v točkah 5.5.1.2 ali 8.4 standarda EN 206:2013.
(3) Ta evropski standard ne zajema postopkov ali meril za rutinski nadzor skladnosti montažnih betonskih elementov z uporabo neposrednih ali posrednih meritev trdnosti in-situ.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2019
Nadomešča:
SIST EN 13791:2007
Ocenjevanje in-situ tlačne trdnosti betona v konstrukcijah in v montažnih
betonskih elementih
Assessment of in-situ compressive strength in structures and precast concrete
components
Bewertung der Druckfestigkeit von Beton in Bauwerken oder in Bauwerksteilen
Évaluation de la résistance à la compression sur site des structures et des éléments
préfabriqués en béton
Ta slovenski standard je istoveten z: EN 13791:2019
ICS:
91.080.40 Betonske konstrukcije Concrete structures
91.100.30 Beton in betonski izdelki Concrete and concrete
products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 13791
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 91.080.40 Supersedes EN 13791:2007
English Version
Assessment of in-situ compressive strength in structures
and precast concrete components
Évaluation de la résistance à la compression sur site Bewertung der Druckfestigkeit von Beton in
des structures et des éléments préfabriqués en béton Bauwerken oder in Bauwerksteilen
This European Standard was approved by CEN on 7 July 2019.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13791:2019 E
worldwide for CEN national Members.
EN 13791:2018 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviations . 10
4 Investigation objective and test parameters . 12
5 Test regions, test locations and number of tests . 15
5.1 Test regions . 15
5.2 Test locations . 15
6 Core testing and the determination of the in situ compressive strength . 17
7 Initial evaluation of the data set . 18
7.1 Evaluation of the test region to determine if it represents a single concrete strength class18
7.2 Assessment of individual test results within a test region . 19
8 Estimation of compressive strength for structural assessment of an existing structure . 21
8.1 Based only on core test data . 21
8.2 Based on a combination of indirect test data and core test data . 22
8.3 Use of indirect testing with at least three core test data . 24
9 Assessment of compressive strength class of concrete in case of doubt . 25
9.1 General. 25
9.2 Use of core test data . 26
9.3 Indirect testing plus selected core test data . 27
9.4 Screening test using a general or specific relationship with an indirect test procedure . 28
9.5 Procedure where the producer has declared non-conformity of compressive strength . 29
Annex A (informative) Guidance on undertaking an investigation . 30
Annex B (informative) Example of a generic relationship between rebound number and
compressive strength class . 38
Bibliography . 41
European foreword
This document (EN 13791:2019) has been prepared by Technical Committee CEN/TC 104 “Concrete
and related products”, the secretariat of which is held by SN.
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 February 2020, and conflicting national standards
shall be withdrawn at the latest by February 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 13791:2007.
The main changes compared to EN 13791:2007 are:
a) the standard is fully revised but for continuity the methodological approaches and scope is retained
as well as much of the previous layout;
b) the primary focus is on the determination of the characteristic in situ compressive strength for
application with EN 1990 and EN 1992-1-1;
c) more comprehensive guidance is provided on applying the procedures, particularly with respect to
defining a test result, a measurement, volume of concrete, test location, small test region and test
region;
d) requirements to set out the purpose of the investigation, procedures to be adopted, test methods,
test locations and test regions to be defined prior to commencing the testing, are included;
e) Clause 8, "Estimation of compressive strength for structural assessment of an existing structure",
covers the previous requirements for assessment of characteristic in situ compressive strength by
either testing cores or indirect methods;
f) Clause 9, "Assessment of compressive strength class of concrete in case of doubt", covers previous
requirements for the assessment where conformity of concrete based on standard tests is in doubt;
g) approaches A and B in EN 13791:2007 are no longer valid;
h) EN 13791 is aligned with the requirements of EN 206.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
EN 13791:2018 (E)
Introduction
(1) This document covers two applications of in situ strength assessments. These are:
— to estimate in situ characteristic compressive strength of a test region and/or in situ strength at
specific locations;
— assessment of compressive strength class of concrete supplied to a structure under construction
where there is doubt about the compressive strength based on results of standard tests or doubt
about the quality of execution.
(2) Both applications have a number of common steps as shown in Table 1, but the assessment methods
differ. The reason for this difference is that with the estimation of the in situ strength (Clause 8) there is
no presumption as to what this should be and the uncertainty associated with the number of data are
taken into account when estimating the value. The in situ strength determined in accordance with
Clause 8 is a value based on testing a finished structure or element, as referred to by EN 1992-1-1:2004,
A.2.3.
NOTE Information may be available on the original quality of the supplied concrete, but the in situ strength
may have changed over time.
(3) Most of the procedures in Clause 9 apply where there is verification that the concrete supplied is in
accordance with the producer's declaration of performance for compressive strength but test results
from samples taken on site indicate non-conformity, and where this difference cannot be resolved by
other means. As the procedures given in CEN standards for the verification of the declaration of
performance are regarded as being reliable, the assumption is that the concrete conforms to the
specified characteristic strength and the applied statistical tests check the validity of this hypothesis.
Where a Clause 9 assessment indicates non-conformity of compressive strength then the 9.5 procedure
should be adopted by the producer and other involved parties.
(4) The Clause 8 and Clause 9 procedures have different approaches that may lead to significantly
different outcomes.
(5) Unless indicated otherwise, the provisions given in this document apply to concrete structures
made from normal-weight, lightweight or heavyweight concrete.
(6) This document only covers the use of a single relationship between an indirect test method (UPV or
rebound hammer) and compressive strength. The combined use of both UPV and rebound hammer
techniques with core strength is a useful technique, but the procedures are not detailed in this
document.
(7) This document was developed with the expectation that it will be used with EN 1992-1-1. If it is
used in conjunction with other design standards, some of the factors may need modification. In
addition, this document uses the EN 1992-1-1:2004, 3.1.6, recommended value of 1,0 for the factor α
cc
and EN 1992-1-1:2004, A.2.3, recommended value of 0,85 for the factor η. Where national provisions
adopt different values for these coefficients then adjustments to the appropriate formula within this
Standard may be required.
(8) Techniques outside the range of those specified in this document may be given in provisions valid in
the place of use. For example, these include:
— combining two indirect test methods with core testing;
— use of cores of diameter less than 50 mm;
— use of pull-out testing;
— a screening test conforming to the principles specified in 9.4;
— in the Clause 8 procedures, provisions for less than 8 cores without indirect testing;
— assessing the strength gradient across a section after a fire;
— in the Clause 9 procedures, comparing an element where the concrete quality is in doubt with a
similar element containing conforming concrete.
In addition, provisions valid in the place of use may give requirements for other aspects not specified in
this document. For example, these include:
— relationship between 2:1 and 1:1 core compressive strengths if a value other than 0,82 is justified
on the basis of test data for the local materials;
— relationship between in situ compressive strength and core length to diameter ratio for values
other than 2:1 or 1:1;
— relationship between in situ compressive strength for lightweight concretes and core length to
diameter ratio;
— adjustment to core strength for cores containing transverse reinforcement;
— relationship between core strength and the strength of a cast cylinder of equal diameter and length;
— factors when the assessment is other than with EN 1992-1-1 or EN 1990;
— factor η given in A.2.3 of EN 1992-1-1:2004 where the national provisions use a value different to
the recommended value of 0,85;
— in 8.3 different criteria for structural assessment;
— in 9.2 and 9.3 different criteria where the criteria for compressive strength in
EN 206:2013+A1:2016, B.3.1, were not used for the assessment of a number of loads delivered to a
construction site;
— guidance on appropriate actions where the producer of the concrete has declared non-conformity
or where the concrete has been proven to be non-conforming.
(9) Guidance on undertaking an investigation is given in Annex A.
(10) Further guidance and background information on this revision of EN 13791 and worked examples
of the calcul
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