Self consolidating concrete scc

30-Jan-2020 11:16 by 9 Comments

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Just as all concrete mixes should be carefully designed to achieve the required performance characteristics, properly placed and properly cured so should SCC.Self consolidating concrete (SCC) is highly flowable, non segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation (ACI 237).

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The first generation of SCC was therefore characterized and specified for specialized a concrete mix which has a low yield stress, high deformability, good segregation resistance (prevents separation of particles in the mix), and moderate viscosity (necessary to ensure uniform suspension of solid particles during transportation, placement (without external compaction), and thereafter until the concrete sets).In everyday terms, when poured, SCC is an extremely fluid mix with the following distinctive practical features - it flows very easily within and around the formwork, can flow through obstructions and around corners ("passing ability"), is close to self-levelling (although not actually self-levelling), does not require vibration or tamping after pouring, and follows the shape and surface texture of a mold (or form) very closely once set.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.As a result, pouring SCC is also much less labor-intensive compared to standard concrete mixes.

Once poured, SCC is usually similar to standard concrete in terms of its setting and curing time (gaining strength), and strength.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.with your company name and Sika sales representatives name and we’ll fix you up!Very simply, SCC is simply a mix that is optimized for flow characteristics.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.