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Ordinarily, concrete is a dense, vicous 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.

vibration of self consolidating concrete-86

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.

This type of concrete must meet special project requirements in terms of placement and flow.

Self-compacting concrete with a similar water cement or cement binder ratio will usually have a slightly higher strength compared with traditional vibrated concrete, due to the lack of vibration giving an improved interface between the aggregate and hardened paste.

This picture demonstrates the “bugholes” on the surface of conventional concrete that has been placed into a form and vibrated.

Precasters spend valuable time and money “rubbing out” surface imperfections when using conventional concrete.

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