Self-compacting concrete (SCC) is a type of concrete that is able to flow and fill the formwork or moulds under its own weight, without the need for mechanical vibration. This is achieved through a combination of high workability and viscosity, which allows the concrete to flow smoothly and evenly into all corners and voids of the formwork.
There are several types of self-compacting concrete, including:
- Self-consolidating concrete (SCC): This type of self-compacting concrete is designed to have a high flowability and viscosity that enables it to flow into place and self-consolidate under its own weight, without the need for external vibration. SCC is commonly used in applications such as columns, walls, and beams.
- Self-leveling concrete: This type of self-compacting concrete has a lower viscosity and is designed to flow and level itself to a smooth finish without the need for troweling. Self-leveling concrete is commonly used as a topping for existing concrete floors or as an underlayment for tile, carpet, or other flooring materials.
- High-performance self-compacting concrete (HPSCC): This type of self-compacting concrete is designed to have high strength and durability, making it ideal for use in applications such as bridges, tunnels, and high-rise buildings. HPSCC typically contains a higher percentage of cement and a lower water-to-cement ratio than standard concrete, which results in a denser, stronger material.
- Fiber-reinforced self-compacting concrete: This type of self-compacting concrete contains small fibers, such as steel or synthetic fibers, which provide added reinforcement and improve the toughness and durability of the material. Fiber-reinforced self-compacting concrete is commonly used in applications such as floors, pavements, and precast elements.
- Lightweight self-compacting concrete: This type of self-compacting concrete contains lightweight aggregates, such as expanded clay or shale, which reduces the weight of the material while maintaining its strength and workability. Lightweight self-compacting concrete is commonly used in applications such as walls, columns, and precast elements.
Overall, self-compacting concrete offers a number of advantages over traditional concrete, including improved workability, reduced labor and equipment costs, and better surface finishes. Its ability to flow and fill formwork without the need for external vibration also makes it ideal for use in complex or intricate structures.
