Self consolidating concrete test set
can reduce the water-cement ratio, and the high-range water reducer (HRWR) demand.The reduction in free water can reduce the concentration of viscosity-enhancing admixture (VEA) necessary to ensure proper stability during casting and thereafter until the onset of hardening.It is used in the construction where it is hard to use vibrators for consolidation of concrete.Filling and passing ability, segregation resistance are the properties of self compacting concrete.The fine aggregates with particle size less than 0.125mm are generally employed.The quality of water used is same that followed for reinforced concrete and prestressed concrete construction.The mineral admixtures used can vary based on the mix design and properties required.
This kind of air content (unlike that in aerated concrete) is not desired and weakens the concrete if left.
The size of the aggregates used for SCC design is limited to 20mm.
If the reinforcement employed for the structure is congested, the aggregate size used can be in the range 10 to 12mm.
This improves the quality and durability of the SCC structures.
Silica Fumes: The use of silica fumes helps to increase the mechanical properties of the self compacting concrete structure.
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The incorporation of powder, including supplementary cementitious materials and filler, can increase the volume of the paste, hence enhancing deformability, and can also increase the cohesiveness of the paste and stability of the concrete.