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Concrete that segregates loses strength and results in honeycombed areas next to the formwork.
A well designed SCC mix does not segregate, has high deformability and excellent stability characteristics Self-compacting concrete produces resistance to segregation by using mineral fillers or fines and using special admixtures.
Self-consolidating concrete is a highly flowable type of concrete that spreads into the form without the need for mechanical vibration.
Self-compacting concrete is a non-segregating concrete that is placed by means of its own weight.
In certain instances the addition of superplasticizers and viscosity modifier are added to the mix, reducing bleeding and segregation.The stability or resistance to segregation of the plastic concrete mixture is attained by increasing the total quantity of fines in the concrete and/or by using admixtures that modify the viscosity of the mixture.Increased fines contents can be achieved by increasing the content of cementititious materials or by incorporating mineral fines.Self-consolidating concrete is required to flow and fill special forms under its own weight, it shall be flowable enough to pass through highly reinforced areas, and must be able to avoid aggregate segregation.This type of concrete must meet special project requirements in terms of placement and flow.
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SCC mixtures typically have a higher paste volume, less coarse aggregate, and higher sand-to-coarse aggregate ratio than typical concrete mixtures.