Creep - increase in deformation while load is cst Relaxation - decrease in load while deformation is cst.

The deformation remaining after a specimen has been stressed in tension for a definite period, and released for a definite period. For creep tests, it is the residual, unrecoverable deformation after the load, causing the creep, has been removed for a substantial and definite period of time.

Necking, or deformation under tension, contributes to tertiary creep in that necking exponentially increases the stress on the solid material.

Concrete creep is defined as: deformation of structure under sustained load.

Basically, long term pressure or stress on concrete can make it change shape. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.

Creep does not necessarily cause concrete to fail or break apart. Creep is factored in when concrete structures are designed.

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