For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.

# Concrete compressive strength at an age of t days, fck(t)

## Eurocode 2 part 1-1: Design of concrete structures \$(document).ready(function () { var freeExample = \$("#freeExample").length; \$("#mainMenu li#nav-appCate, #mainMenu li#nav-appEC211").addClass("active"); var proUser = false === true || false === true || freeExample !== 0; if (!proUser) { \$('#Input input').keyup(function(){ \$('#AlertSubscribe').modal(); }); \$('#Input select').change(function(){ \$('#AlertSubscribe').modal(); }); }; var tempInput = \$("#tempInput").text(); if (tempInput != "") { \$("#Input").parent("form").deserialize(tempInput); if (proUser) { \$("#acceptBtn").trigger("click"); } }; });  3.1.2 (5)

The concrete compressive strength at an age of t days is:

 fck(t) = fcm(t) - 8 (MPa) for 3 < t < 28 days fck(t) = fck for t ≥ 28 days

where:

fck
is the characteristic compressive cylinder strength of concrete at 28 days according to Table 3.1
fcm(t)
is the mean concrete compressive strength at an age t days
t
is the age of the concrete.

This application calculates the compressive strength fck(t) from your inputs. Intermediate results will also be given.

Input
days

Output
fck
MPa
fcm(t)
MPa
the compressive strength fck(t)
MPa