How Concrete Mixes Separate During Placement

Fresh concrete can separate during placement, which changes how the mix is spread and can weaken the finished structure. This separation is called segregation. It happens when the parts of the mix no longer stay evenly blended.

Segregation often occurs when concrete moves too much inside a form. ...

Excessive horizontal movement of concrete within forms, or dropping it from a considerable height or through narrow spaces with directional changes, can lead to the segregation of its components.

Segregation is a phenomenon wherein the heavier coarse aggregate particles tend to settle at the bottom of the form. At the same time, the light...