Creep of Concrete | Creep of Concrete formula | Creep In Concrete | Creep of Concrete Means | Creep of Concrete Images | Measurement of Creep of Concrete | creep coefficient | ultimate creep coefficient

What is creep in concrete

Creep of Concrete is defined as under sustained compressive loading or we can say tensile load , deformation in concrete goes on increase with time , so the time dependent factor of strength of concrete is called creep.

Creep occurs due to dead load of the structure as well as due to permanent live load. Creep depend on stress applied so if we conclude by saying that higher the stress applied higher the creep introduced.

We are unaware of the exact mechanism of creep , following are the certain points to which creep is attributed

1.       Internal movement of adsorbed water.

2.       Sliding between gel (calcium-silicate-hydrate gel) particles.

3.       Moisture loss.

4.       Growth of micro cracks.

  As we discussed earlier that creep is dependent on stress developed , so as long as stress in concrete doesn’t exceed the 1/3^rd of it’s characteristics compressive strength , creep may be assumed to be proportional to the stress. This enables to calculate the total deflection due o initial as well as due to permanent live load by linear elastic analysis with reduced elastic modulus.

Creep coefficient 

Creep coefficient at any time ‘ t ‘

               Ct = (creep strain at any time 't') / ( elastic strain )

Ultimate creep coefficient

Maximum value of creep coefficient is termed as ultimate creep coefficient

       
  θ =  (ultimate creep strain) / (elastic strain)