As per IS456: 2000, for 28 days age at loading, what will be the creep coefficient?

Concept

See clause 6.2.5.1 of IS 456:2000, the strain that develops due to constant sustain loading is called creep strain but in the initial age of concrete, the creep strain of concrete is higher than later age.

As per IS 456: 2000, Clause 6.2.5.1:

The effective modulus of elasticity is given by:

\({E_{effective}} = \frac{{{E_c}}}{{1 + θ }}\)

where,

Ec = Modulus of elasticity of concrete

However, elastic strain remains constant throughout. So the creep coefficient (θ ) \(= \frac{{Creep\;strain}}{{Elastic\;strain}},\) decrease with time.