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1、BRITISH STANDARD BS EN
13791:2007
Assessment of in-situ compressive strength in structures and precast concrete components
The European Standard EN 13791:2007 has the status of a
British Standard
ICS 91.
2、080.40
BS EN 13791:2007
National foreword
This British Standard was published by BSI. It is the UK implementation of EN 13791:2007. It partially supersedes BS 6089:1981 which will be withdrawn on pub
3、lication of complementary guidance (currently in preparation).
The UK participation in its preparation was entrusted by Technical Committee
B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing.
A list of organizations represented on B/517/1 can be obtained on request to
4、its secretary.
A National Annex NA (informative) is included, which provides additional guidance for use in the UK.
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
Compliance with a British Standard
5、 cannot confer immunity from legal obligations.
Amd. No.
Date
Comments
This British Standard was published under the authority of the Standards Policy and Strategy Committee
on 28 February 20
6、07
? BSI 2007
ISBN 978 0 580 50271 2
Amendments issued since publication
EUROPEAN STANDARD NORME EUROPéENNE
EUROP?ISCHE NORM
EN 13791
January 2007
ICS
English Version
Assessment of in-situ compressive strength in structures and precast concrete comp
7、onents
Evaluation de la résistance à la compression du béton en place dans les structures et les éléments préfabriqués
Bewertung der Druckfestigkeit von Beton in Bauwerken oder in Bauwerksteilen
This European Standard was approved by CEN on 10 November 2006.
CEN members are bound
8、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
9、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 Management Centre has the same sta
10、tus as the official 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, Rom
11、ania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I Té EUR O P éEN DE NOR M A L I S A TI ON EUR O P ? I S C H ES KOM I TEE F ü R NOR M UNG
Management Centre: r
12、ue de Stassart, 36 B-1050 Brussels
? 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. EN 13791:2007: E
Contents Page
Foreword...................................................................
13、...........................................................................................4
Introduction .........................................................................................................................................................5
1 Scope .........................
14、.............................................................................................................................7
2 Normative references ............................................................................................................................7
3 Terms and defini
15、tions ...........................................................................................................................8
4 Symbols and abbreviations ..................................................................................................................9
5 Principles ......
16、........................................................................................................................................10
6 Characteristic in-situ compressive strength in relation to compressive strength class .............10
7 Assessment of characteristic in-situ compressive
17、strength by testing of cores .........................11
7.1 Specimens ............................................................................................................................................11
7.2 Number of test specimens .......................................................
18、...........................................................11
7.3 Assessment ..........................................................................................................................................11
7.3.1 General...................................................................
19、...............................................................................11
7.3.2 Approach A...........................................................................................................................................12
7.3.3 Approach B..........................................
20、.................................................................................................12
8 Assessment of characteristic in-situ compressive strength by indirect methods .......................13
8.1 General...............................................................................
21、...................................................................13
8.1.1 Methods ................................................................................................................................................13
8.1.2 Alternative 1 – Direct correlation with cores ...............
22、.....................................................................13
8.1.3 Alternative 2 – Calibration with cores for a limited strength range using an established relationship........................................................................................................................
23、...................14
8.2 Indirect tests correlated with in-situ compressive strength, (Alternative 1) .................................14
8.2.1 Application ...........................................................................................................................................14
24、
8.2.2 Testing procedure................................................................................................................................14
8.2.3 Establishing the relationship between test result and in-situ compressive strength ..................14
8.2.4 Assessment of in-situ comp
25、ressive strength ...................................................................................14
8.3 Use of a relationship determined from a limited number of cores and a basic curve, (Alter- native 2) ...........................................................................................
26、.....................................................15
8.3.1 General..................................................................................................................................................15
8.3.2 Testing ..................................................................
27、................................................................................15
8.3.3 Procedure .............................................................................................................................................15
8.3.4 Validity of relationships .......................
28、...............................................................................................19
8.3.5 Estimation of in-situ compressive strength......................................................................................19
8.4 Combination of in-situ strength test results by various tes
29、t methods ..........................................19
9 Assessment where conformity of concrete based on standard tests is in doubt: .......................20
10 Assessment report .................................................................................................................
30、.............21
Annex A (informative) Factors influencing core strength..............................................................................22
A.1 General.....................................................................................................................................
31、.............22
A.2 Concrete characteristics .....................................................................................................................22
A.2.1 Moisture content ..............................................................................................................
32、....................22
A.2.2 Voidage .................................................................................................................................................22
A.2.3 Direction relative to the casting .........................................................................
33、................................22
A.2.4 Imperfections .......................................................................................................................................22
A.3 Testing variables....................................................................................
34、..............................................22
A.3.1 Diameter of core...................................................................................................................................22
A.3.2 Length/diameter ratio .................................................................
35、.........................................................23
A.3.3 Flatness of end surfaces .................................................................................................................... 23
A.3.4 Capping of end surfaces..................................................
36、................................................................... 23
A.3.5 Effect of drilling ................................................................................................................................... 23
A.3.6 Reinforcement ...............................................
37、...................................................................................... 23
Annex B (informative) Factors influencing results by indirect test methods .............................................. 24
B.1 Rebound hammer tests.........................................................
38、.............................................................. 24
B.2 Ultrasonic pulse velocity measurements.......................................................................................... 24
B.3 Pull-out tests .............................................................................
39、........................................................... 24
Annex C (informative) Concepts concerning the relationship between in-situ strength and
strength from standard test specimens ............................................................................................ 25
Annex D
40、 (informative) Guidelines for planning, sampling and evaluation of test results when
assessing in-situ strength .................................................................................................................. 26
D.1 Planning........................................................
41、........................................................................................ 26
D.2 Sampling............................................................................................................................................... 26
D.3 Testing programme .........................
42、.................................................................................................... 26
D.4 Assessment ......................................................................................................................................... 27
National Annex NA (informative) Additi
43、onal guidance for UK users ............................................................. 29
Bibliography...................................................................................................................................................... 28
Foreword
This d
44、ocument (EN 13791:2007) 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 lates
45、t by July 2007, and conflicting national standards shall be withdrawn at the latest by July 2007.
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, Cyprus, C
46、zech 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.
Introduction
This Eur
47、opean Standard provides techniques for estimating in-situ compressive strength in concrete structures and precast concrete components. Testing in-situ strength takes into account the effects of both the materials and execution (compaction, curing, etc.).
These tests do not replace concr
48、ete testing according to EN 206-1.
EN 206-1 refers to the guidance of this standard for assessing the strength in structures and precast concrete components.
The following examples illustrate where this estimate of in-situ strength of concrete may be required:
? when an existing structure
49、is to be modified or redesigned;
? to assess structural adequacy when doubt arises about the compressive strength in the structure due to defective workmanship, deterioration of concrete due to fire or other causes;
? when an assessment of the in-situ concrete strength is needed during const
50、ruction;
? to assess structural adequacy in the case of non-conformity of the compressive strength obtained from standard test specimens;
? assessment of conformity of the in-situ concrete compressive strength when specified in a specification or product standard.
Where identified in this
51、 standard, national provisions are permitted or required.
An outline of the procedures for these different uses of this standard is given in Flowchart 1.
For specific production conditions and constituent materials, development of economic design where permitted by national provisio
52、ns may be possible through the assessing the partial safety factor, gc from knowledge of the in-situ compressive strength and the strength of standard test specimens.
When assessing compressive strengths in cases other than checking the quality of the concrete or the workmanship during executio
53、n or before accepting the structure for use, the appropriate reduction in the partial safety factor should be determined on a case-by-case basis according to national provisions.
Flowchart 1
1 Scope
This European Standa
54、rd:
? gives methods and procedures for the assessment of the in-situ compressive strength of concrete in structures and precast concrete components;
? provides principles and guidance for establishing the relationships between test results from indirect test methods and the in-situ core stre
55、ngth;
? provides guidance for the assessment of the in-situ concrete compressive strength in structures or precast concrete components by indirect or combined methods.
This European Standard does not include the following cases:
? where indirect methods are used without correlation to cor
56、e strength;
? assessment based on cores less than 50 mm in diameter;
? assessment based on less than 3 cores;
? use of microcores.
NOTE In these cases provisions valid in place of use apply.
This European Standard is not for the assessment of conformity of concrete comp
57、ressive strength in accordance with EN 206-1 or EN 13369 except as indicated in EN 206-1:2000, 5. or 8.4.
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 re
58、ferences, the latest edition of the referenced document (including any amendments) applies.
EN 206-1:2000, Concrete – Part 1: Specification, performance, production and conformity
EN 12350-1,Testing fresh concrete – Part 1: Sampling
EN 12390-1, Testing hardened concrete - Part 1: Shape, dim
59、ensions and other requirements for 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 12504-1, Testing concrete in structures – Part 1:
60、Cored specimens – Taking, examining and testing in compression
EN 12504-2, Testing concrete in structures – Part 2: Non-destructive testing – Determination of rebound number
EN 12504-3, Testing concrete in structures – Part 3: Determination of pull-out force
EN 12504-4, Testing concre
61、te in structures – Part 4: Determination of ultrasonic pulse velocity
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 206-1:2000 and the following apply.
standard compressive strength
compressive strength determined on standar
62、d test specimens (cubes or cylinders) which are sampled, made, cured and tested in accordance with EN 12350-1, EN 12390-2 and EN 12390-3
core compressive strength
compressive strength of a core determined in accordance with EN 12504-1
in-situ compressive strength
strength in a structural
63、 element or precast concrete components expressed in terms of the equivalent strength of a standard cube or cylinder specimen
characteristic in-situ compressive strength
value of in-situ compressive strength below which 5 % of the population of all possible strength determinations of the volum
64、e of concrete under consideration are expected to fall
NOTE This population is unlikely to be the same population used to determine the conformity of the fresh concrete in
EN 206-1.
test location
limited area selected for measurements used to estimate one test result, which is to be used i
65、n the estimation of in-situ compressive strength
test region
one or several structural elements, or precast concrete components assumed or known to be from the same population. A test region contains several test locations
4 Symbols and abbreviations
?f shift of the basic curv
66、e
δf difference between the core strength and the strength value according to the basic relationship
δfm(n) mean of n, values of δf
F pull-out force test result
fis in-situ compressive strength test result
fis, lowest lowest in-situ compressive strength test result
fm(n), is mean in-situ compressive strength of n test results
fck characteristic compressive strength of standard specimens
fck, is characteristic in-situ compressive strength
fck, is, cube characteristic in
bs英國(guó)標(biāo)準(zhǔn)】bs en 13791 assessment of insitu compressive strength in structures and precast concrete components
