Concrete is one of the world’s most-commonly used materials, and is used extensively in the construction of buildings, bridges, dams, and more. Although often criticised for its appearance, concrete offers versatility, strength, and durability. One of the more popular types is self-compacting or self-consolidating concrete, also known as SCC.

Self-compacting concrete

Self-compacting concrete was developed in the late 1980s by the Japanese Professor Dr. Hajime Okamura. This was in response to concerns over the quality of concrete that was being made on building sites.

There are four main components of self-compacting concrete. These are outlined below.

Portland cement

The primary binding agent in SCC is Portland cement. This is a fine powder that is made from clay, limestone, and shale. This cement hardens when mixed with water.

Aggregates

SCC uses similar aggregates to normal concrete, such as sand and gravel. However, these aggregates are usually finer than those used in traditional concrete.

Water

Water is a key ingredient of concrete, and the amount added is carefully controlled to achieve the consistency that is desired. It is important not to add too much water as excessive fluidity can cause various issues.

Admixtures

These chemical or mineral additives are mixed into the concrete to enhance its properties. This includes improving workability, reducing water content, and boosting durability. They can also decrease or increase the setting time.

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Advantages

SCC has a number of key advantages. It reduces the permeability of the structures it is used on, it offers high flow and greater flexibility, it is easily laid, its construction is faster than standard concrete, and it does not require vibration.

Uses

This type of concrete is used in instances where there is high compressive strength and where workability is important. Examples include bridges and precast sections, earth retaining structures, drilled shaft columns, and concrete pipes.