1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58precast concrete componentsThe European Standard EN 13791:2007 has the status of a British Standard
2、ICS 91.080.40Assessment of in-situ compressive strength in structures and BRITISH STANDARDBS EN 13791:2007BS EN 13791:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2007 BSI 2007ISBN 978 0 580 50271 2Amendments issued since p
3、ublicationAmd. No. Date CommentsA 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 Sta
4、ndard cannot confer immunity from legal obligations.National forewordThis 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 It partially supersedes BS 6089:1981 which will be withdrawn on publication of complementary guidance (currently in preparation).The UK parti
5、cipation 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 its secretary.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13791January 2007ICS
6、 91.080.40English VersionAssessment of in-situ compressive strength in structures andprecast concrete componentsEvaluation de la rsistance la compression du bton enplace dans les structures et les lments prfabriqusBewertung der Druckfestigkeit von Beton in Bauwerkenoder in BauwerksteilenThis Europea
7、n Standard was approved by CEN on 10 November 2006.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 conce
8、rning 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 l
9、anguage 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, L
10、uxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rig
11、hts of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13791:2007: EEN 13791:2007 (E) 2 Contents Page Foreword4 Introduction .5 1 Scope 7 2 Normative references 7 3 Terms and definitions .8 4 Symbols and abbreviations 9 5 Principles10 6 Characteristic
12、 in-situ compressive strength in relation to compressive strength class .10 7 Assessment of characteristic in-situ compressive strength by testing of cores .11 7.1 Specimens 11 7.2 Number of test specimens11 7.3 Assessment11 7.3.1 General11 7.3.2 Approach A.12 7.3.3 Approach B.12 8 Assessment of cha
13、racteristic in-situ compressive strength by indirect methods.13 8.1 General13 8.1.1 Methods 13 8.1.2 Alternative 1 Direct correlation with cores 13 8.1.3 Alternative 2 Calibration with cores for a limited strength range using an established relationship.14 8.2 Indirect tests correlated with in-situ
14、compressive strength, (Alternative 1) .14 8.2.1 Application .14 8.2.2 Testing procedure14 8.2.3 Establishing the relationship between test result and in-situ compressive strength14 8.2.4 Assessment of in-situ compressive strength.14 8.3 Use of a relationship determined from a limited number of cores
15、 and a basic curve, (Alter-native 2) 15 8.3.1 General15 8.3.2 Testing 15 8.3.3 Procedure .15 8.3.4 Validity of relationships 19 8.3.5 Estimation of in-situ compressive strength19 8.4 Combination of in-situ strength test results by various test methods 19 9 Assessment where conformity of concrete bas
16、ed on standard tests is in doubt:.20 10 Assessment report 21 Annex A (informative) Factors influencing core strength22 A.1 General22 A.2 Concrete characteristics.22 A.2.1 Moisture content22 A.2.2 Voidage .22 A.2.3 Direction relative to the casting .22 A.2.4 Imperfections .22 A.3 Testing variables22
17、A.3.1 Diameter of core.22 A.3.2 Length/diameter ratio 23 EN 13791:2007 (E) 3 A.3.3 Flatness of end surfaces 23 A.3.4 Capping of end surfaces.23 A.3.5 Effect of drilling .23 A.3.6 Reinforcement .23 Annex B (informative) Factors influencing results by indirect test methods24 B.1 Rebound hammer tests.2
18、4 B.2 Ultrasonic pulse velocity measurements24 B.3 Pull-out tests24 Annex C (informative) Concepts concerning the relationship between in-situ strength and strength from standard test specimens25 Annex D (informative) Guidelines for planning, sampling and evaluation of test results when assessing in
19、-situ strength26 D.1 Planning26 D.2 Sampling.26 D.3 Testing programme .26 D.4 Assessment .27 Bibliography28 National Annex NA (informative) Additional guidance for UK users.29 EN 13791:2007 (E) 4 Foreword This document (EN 13791:2007) has been prepared by Technical Committee CEN/TC 104 “Concrete and
20、 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 July 2007, and conflicting national standards shall be withdrawn at the latest by July
21、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, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, I
22、taly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 13791:2007 (E) 5 Introduction This European Standard provides techniques for estimating in-situ compressive strength in concrete structure
23、s 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 concrete testing according to EN 206-1. EN 206-1 refers to the guidance of this standard for assessing the strength in
24、 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 is to be modified or redesigned; to assess structural adequacy when doubt arises about the compressive strength in the struct
25、ure 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 construction; to assess structural adequacy in the case of non-conformity of the compressive strength obtained from standard test specimens; a
26、ssessment of conformity of the in-situ concrete compressive strength when specified in a specification or product standard. Where identified in this standard, national provisions are permitted or required. An outline of the procedures for these different uses of this standard is given in Flowchart 1
27、. For specific production conditions and constituent materials, development of economic design where permitted by national provisions may be possible through the assessing the partial safety factor, cfrom knowledge of the in-situ compressive strength and the strength of standard test specimens. When
28、 assessing compressive strengths in cases other than checking the quality of the concrete or the workmanship during execution 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 provision
29、s. EN 13791:2007 (E) 6 Flowchart 1 EN 13791:2007 (E) 7 1 Scope This European Standard: 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 be
30、tween test results from indirect test methods and the in-situ core strength; 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: wh
31、ere indirect methods are used without correlation to core 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 conform
32、ity of concrete compressive strength in accordance with EN 206-1 or EN 13369 except as indicated in EN 206-1:2000, 5.5.1.2 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. F
33、or undated references, 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
34、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: Cored specimens
35、 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 13791:2007 (E) 8 EN 12504-4, Testing concrete in structures P
36、art 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. 3.1 standard compressive strength compressive strength determined on standard test specimens (cubes or cylin
37、ders) which are sampled, made, cured and tested in accordance with EN 12350-1, EN 12390-2 and EN 12390-3 3.2 core compressive strength compressive strength of a core determined in accordance with EN 12504-1 3.3 in-situ compressive strength strength in a structural element or precast concrete compone
38、nts expressed in terms of the equivalent strength of a standard cube or cylinder specimen 3.4 characteristic in-situ compressive strength value of in-situ compressive strength below which 5 % of the population of all possible strength determinations of the volume of concrete under consideration are
39、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. 3.5 test location limited area selected for measurements used to estimate one test result, which is to be used in the estimation of in-situ compressive stre
40、ngth 3.6 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 EN 13791:2007 (E) 9 4 Symbols and abbreviations f shift of the basic curve f difference between the core strength and
41、 the strength value according to the basic relationship fm(n)mean of n, values of f F pull-out force test result fisin-situ compressive strength test result fis, lowestlowest in-situ compressive strength test result fm(n), ismean in-situ compressive strength of n test results fckcharacteristic compr
42、essive strength of standard specimens fck, ischaracteristic in-situ compressive strength fck, is, cubecharacteristic in-situ compressive strength expressed in equivalent strength of a 150 mm cube, see 7.1 fck, is, cylcharacteristic in-situ compressive strength expressed in equivalent strength of a 1
43、50 mm 300 mm cylinder, see 7.1 fis, lestimated in-situ compressive strength test result by indirect test methods when a specificrelationship is established by core tests, (Alternative 1) fis, Festimated in-situ compressive strength test result by pull-out tests calibrated by core tests, (Alternative
44、 2) fis, Restimated in-situ compressive strength test result by rebound hammer tests calibrated by coretests, (Alternative 2) fis, vestimated in-situ compressive strength test result by ultrasonic pulse velocity tests calibrated bycore tests, (Alternative 2) fFinitial value of in-situ strength obtai
45、ned from the basic curve for a pull-out force, Figure 4, test result F used in the determination of the shift fRinitial value of in-situ strength obtained from the basic curve for a rebound hammer, Figure 2, testresult R used in the determination of the shift fvinitial value of in-situ strength obta
46、ined from the basic curve for a pulse-velocity, Figure 3 test result v used in the determination of the shift c partial safety factor for concrete k margin associated with small numbers of test results k1coefficient that depends on the number of paired tests k2 coefficient that depends upon provisio
47、ns valid in the place of use or, if none are given, acoefficient with a value of 1,48 n number of test results R rebound hammer test result s standard deviation v ultrasonic pulse velocity test result EN 13791:2007 (E) 10 5 Principles Assessment of in-situ compressive strength directly from core tes
48、ts constitutes the reference method, see 7. The assessment of in-situ compressive strength may also be done indirectly by other tests, see 8.2 and 8.3, or by a combination of various test methods, see 8.4. Where indirect tests are used, the uncertainty associated with the relationship between the te
49、st and core test is taken into account. The test data may be used to estimate the in-situ characteristic strength and the corresponding strength class according to EN 206-1. 6 Characteristic in-situ compressive strength in relation to compressive strength class Table 1 gives requirements for the minimum characteristic in-situ compressive strength with respect to the compressive strength classes according to EN 206-1. Table 1 Minimum characteristic in-situ compressive strength for t
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