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ONORM EN 13791 : 2007
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ASSESSMENT OF IN-SITU COMPRESSIVE STRENGTH IN STRUCTURES AND PRECAST CONCRETE COMPONENTS
15-02-2020
12-01-2013
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Principles
6 Characteristic in-situ compressive strength in relation to
compressive strength class
7 Assessment of characteristic in-situ compressive strength
by testing of cores
7.1 Specimens
7.2 Number of test specimens
7.3 Assessment
7.3.1 General
7.3.2 Approach A
7.3.3 Approach B
8 Assessment of characteristic in-situ compressive strength
by indirect methods
8.1 General
8.1.1 Methods
8.1.2 Alternative 1 - Direct correlation with cores
8.1.3 Alternative 2 - Calibration with cores for a
limited strength range using an established
relationship
8.2 Indirect tests correlated with in-situ compressive
strength, (Alternative 1)
8.2.1 Application
8.2.2 Testing procedure
8.2.3 Establishing the relationship between test result
and in-situ compressive strength
8.2.4 Assessment of in-situ compressive strength
8.3 Use of a relationship determined from a limited number
of cores and a basic curve, (Alternative 2)
8.3.1 General
8.3.2 Testing
8.3.3 Procedure
8.3.4 Validity of relationships
8.3.5 Estimation of in-situ compressive strength
8.4 Combination of in-situ strength test results by various
test methods
9 Assessment where conformity of concrete based on standard
tests is in doubt:
10 Assessment report
Annex A (informative) Factors influencing core strength
A.1 General
A.2 Concrete characteristics
A.2.1 Moisture content
A.2.2 Voidage
A.2.3 Direction relative to the casting
A.2.4 Imperfections
A.3 Testing variables
A.3.1 Diameter of core
A.3.2 Length/diameter ratio
A.3.3 Flatness of end surfaces
A.3.4 Capping of end surfaces
A.3.5 Effect of drilling
A.3.6 Reinforcement
Annex B (informative) Factors influencing results by indirect
test methods
B.1 Rebound hammer tests
B.2 Ultrasonic pulse velocity measurements
B.3 Pull-out tests
Annex C (informative) Concepts concerning the relationship
between in-situ strength and strength from standard
test specimens
Annex D (informative) Guidelines for planning, sampling and
evaluation of test results when assessing in-situ
strength
D.1 Planning
D.2 Sampling
D.3 Testing programme
D.4 Assessment
National Annex NA (informative) Additional guidance for UK users
Bibliography
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