Mean value of concrete compressive strength at an age of t days, fcm(t)
Eurocode 2 part 1-1: Design of concrete structures 3.1.2 (6)
The compressive strength of concrete at various ages, fcm(t), may be estimated as follows:
| fcm(t) = βcc(t)⋅fcm | (3.1) |
where:
- fcm
- is the mean compressive strength 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).
This application calculates the mean compressive strength fcm(t) from your inputs. Intermediate results will also be given.
