# Reinforcement: the limits on individual test results

## Eurocode 2 part 1-1: Design of concrete structures C.1 (3) - Annex C (normative)

EN 10080 does not specify the quantile value for characteristic values, nor the evaluation of test results for individual test units.

In order to be deemed to comply with the long term quality levels in Table C.1, the following limits on test results should be applied:

- where all individual test results of a test unit exceed the characteristic value, (or are below the characteristic value in the case the maximum value of
`f`or_{yk}`k`) the test unit may be assumed to comply, - the individual values of yield strength
`f`and_{y}`ε`should be greater than the minimum values and less than the maximum values. In addition, the mean value,_{u}`M`, of a test unit should satisfy the equation:

M ≥ + C_{v}a | (C.3) |

where:

`C`_{v}- is the long term characteristic value
`a`- is a coefficient which depends on the parameter considered.

## Recommendation

The recommended value of `a` for `f _{yk}` is 10 MPa, and for both

`k`and

`ε`is 0.

_{uk} The recommended values of the minimum and maximum `f _{yk}`,

`k`and

`ε`are given in Table C.3N

_{uk}