Consolidating concrete vibration

The Concrete Foundations Association has produced a new flyer to help contractors educate their customers about the causes of cracks and when they should be a concern.

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is 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).

Another problem associated with cracking is public perception.

Cracks can be unsightly but many consumers feel that if a crack develops in their wall or floor that the product has failed.

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.

As a result, pouring SCC is also much less labor-intensive compared to standard concrete mixes.

When we place concrete it contains an excessive amount of entrapped air.

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