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.
If the SCC mixture is designed to have a higher paste content or fines compared to conventional concrete, an increase in shrinkage may occur. SCC's flowability is generally achieved by using polycarboxylate-based high-range water-reducing (HRWR) admixtures and optimized concrete ingredients while maintaining a low mixing water content in the concrete.
SCC's stability, or resistance to segregation of the plastic concrete mixture, is achieved by using mineral fillers or fines and/or by using viscosity modifying admixtures.
SCC looks very different from conventional concrete while mixing.
Concrete producers must “retrain their eyes” for this very fluid mixture as it turns corners and fills forms.
While SCC mixtures have been successfully produced with 1 ½ inch (38 mm) aggregate, it is easier to design and control with smaller-sized aggregate.
Control of aggregate moisture content is also critical to producing a good mixture.
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