Vibration of self consolidating concrete

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SCC concrete is usually defined as having a spread of 18 to 30 inches wide, making it possible to place concrete under difficult conditions.The viscosity, as visually observed by the rate at which concrete spreads, is an important characteristic of plastic SCC and can be controlled when designing the mix to suit the type of application being constructed.Self-consolidating concrete is defined as a concrete mix that can be placed solely by means of its own weight, with little or no vibration.As a high compressive strength concrete, SCC delivers these attractive benefits while preserving all of concrete's normal mechanical and durability qualities.Ordinarily, concrete is a dense, viscous material when mixed, and when used in construction, requires the use of vibration or other techniques (known as compaction) to remove air bubbles (cavitation), and honeycomb-like holes, especially at the surfaces, where air has been trapped during pouring.This kind of air content (unlike that in aerated concrete) is not desired and weakens the concrete if left.Viscosity-modifying admixtures keep the concrete mix from segregating without restricting flow properties of SCC.By adding these plasticizer admixtures to traditional concrete mix designs, a highly flowable concrete is created that meets tough performance requirements.

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SCC mix designs must maintain a tight balance; they must be fluid without segregating.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.The reduction in cement content and increase in packing density of materials finer than 80 µm, like fly ash etc.SCC can be used for casting heavily reinforced sections, places where there can be no access to vibrators for compaction and in complex shapes of formwork which may otherwise be impossible to cast, giving a far superior surface than conventional concrete.The relatively high cost of material used in such concrete continues to hinder its widespread use in various segments of the construction industry, including commercial construction, however the productivity economics take over in achieving favorable performance benefits and works out to be economical in pre-cast industry.

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