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PD CEN/TR 17086:2020 Further guidance on the application of EN 13791:2019 and background to the provisions, 2020
- undefined
- 1 Scope
- 2 Symbols and abbreviated terms
- 3 General principles adopted for the revision
- 4 In situ compressive strength and other concrete properties assumed in the EN 1992-1-1 design process [Go to Page]
- 4.1 General
- 4.2 Concrete compressive strength based on test specimens
- 4.3 Concrete compressive strength based on the strength of cores from the structure
- 5 Differences between test specimens and concrete in the structure [Go to Page]
- 5.1 Introduction
- 5.2 Reference test specimen
- 5.3 Effects of the moisture condition on in situ specimens
- 5.4 Effect of maturity on concrete strength
- 5.5 Effects of curing
- 5.6 Effects of vibration
- 5.7 Effects of excess entrapped air
- 6 Testing variables that influence core strength [Go to Page]
- 6.1 Introduction
- 6.2 Direction relative to the casting
- 6.3 Imperfections
- 6.4 Diameter of core
- 6.5 Length/diameter ratio
- 6.6 Flatness of end surfaces
- 6.7 Capping of end surfaces
- 6.8 Effect of drilling
- 6.9 Reinforcement
- 7 Scope in EN 13791:2019, Clause 1
- 8 Terms and definitions, symbols and abbreviations in EN 13791:2019, Clause 3
- 9 Investigation objective and test parameters in EN 13791:2019, Clause 4
- 10 Test regions and test locations in EN 13791:2019, Clause 5
- 11 Core testing and the determination of the in situ compressive strength in EN 13791:2019, Clause 6
- 12 Initial evaluation of the data set in EN 13791:2019, Clause 7
- 13 Estimation of compressive strength for structural assessment of an existing structure in EN 13791:2019, Clause 8 [Go to Page]
- 13.1 Based on core test data only (see EN 13791:2019, 8.1)
- 13.2 Based on a combination of indirect test data and core test data (see EN 13791:2019, 8.2)
- 13.3 Use of indirect testing with selected core testing (see EN 13791:2019, 8.3)
- 14 Assessment of compressive strength class of supplied concrete in case of doubt in EN 13791:2019, Clause 9 [Go to Page]
- 14.1 General in EN 13791:2019, 9.1
- 14.2 Use of core test data (see EN 13791:2019, 9.2)
- 14.3 Indirect testing plus selected core testing (see EN 13791:2019, 9.3)
- 14.4 Screening test using general or specific relationship with an indirect test procedure (see EN 13791:2019, 9.4)
- 14.5 Procedure where the producer has declared non-conformity of compressive strength in EN 13791:2019, 9.5
- 14.6 Use of comparative testing
- Annex A (informative)Examples of the calculations [Go to Page]
- A.1 Example A1: Calculating the rebound number
- A.2 Example A2: Calculating the in situ strength from core test data [Go to Page]
- A.2.1 Example A2.1
- A.2.2 Example A2.2
- A.3 Example A3: Assessing the data for a test region to check whether it contains two or more compressive strength classes
- A.4 Example A4: Check for statistical outliers
- A.5 Example A5: Calculation of characteristic in situ compressive strength from core test data
- A.6 Example A6: Establishing a correlation between an indirect test and in situ compressive strength
- A.7 Example A7: Using combined indirect testing and core testing to estimate the characteristic in situ compressive strength and the compressive strength at a location where only an indirect test result is available
- A.8 Example A8: Estimating the characteristic in situ compressive strength using indirect testing and three cores taken from the weaker area [Go to Page]
- A.8.1 Example A8.1
- A.8.2 Example A8.2
- A.9 Example A9: Screening test using a generic relationship
- A.10 Example A10: Screening test using a rebound hammer that has been calibrated against test specimens made from the same concrete
- A.11 Example A11: Assessment of compressive strength class of concrete as placed using indirect testing and selected core test data
- A.12 Example A12: Assessment of compressive strength class of recently supplied concrete using core test data only [Go to Page]
