Mean value of axial tensile strength of concrete at an age of t days, fctm(t)
Eurocode 2 part 1-1: Design of concrete structures 3.1.2 (9)
The mean value of axial tensile strength of concrete an age of t days is:
| fctm(t) = (βcc(t))α⋅fctm | (3.4) |
where:
- fctm
- is the mean value of axial tensile strength of concrete at 28 days, see Table 3.1
- βcc(t)
- is a coefficient which depends on the age of the concrete t:
βcc(t) = exp { s [1 - (28/t)1/2] } (3.2) with
- t
- the age of the concrete
- s
- a coefficient which depends on the type of cement:
= 0,20 for CEM 42,5 R, CEM 52,5 N and CEM 52,5 R (Class R)
= 0,25 for CEM 32,5 R and CEM 42,5 N (Class N)
= 0,38 for CEM 32,5 N (Class S).
- α
- = 1 for t < 28 days
= 2/3 for t ≥ 28 days.
This application calculates the mean tensile strength fctm(t) from your inputs. Intermediate results will also be given.
