Read Roger's article on Reinforced Aerated Autoclaved Concrete (RAAC).
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RESOURCES
Information on Reinforced Autoclaved Aerated Concrete (RAAC)
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GOV.UK RAAC Identification Guidance
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Structural safety of reinforced autoclaved aerated concrete planks
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ABOUT RAAC
Reinforced Aerated Autoclaved Concrete (RAAC) is a specific category within the family of lightweight concrete materials. Let's break down the components of its name to better understand its properties:
Reinforced: Like many concrete types, RAAC can be reinforced with steel bars or mesh to increase its tensile strength and structural capabilities. This reinforcement allows the concrete to withstand forces and stresses that it couldn't bear on its own.
Aerated: Aerated concrete contains many small air pockets or bubbles, which are introduced during the manufacturing process. These air pockets make the material much lighter than traditional concrete and provide it with good insulating properties. The air pockets are created by adding a foaming agent to the concrete mixture or by a chemical reaction between certain ingredients.
Autoclaved: Autoclaving is a process in which the concrete is subjected to high pressure and temperature inside an autoclave (a type of large industrial pressure cooker). This process accelerates the hardening of the concrete and enhances its strength and durability. Autoclaving also results in a more consistent material with fewer defects.
The advantages of RAAC include:
Lightweight: Because of the air pockets, RAAC has a lower density than traditional concrete, which can lead to savings in transportation and construction.
Insulating properties: The air pockets in RAAC provide it with good thermal insulation, making it suitable for use in energy-efficient building designs.
Speed of construction: RAAC panels and blocks can be manufactured in large sizes, allowing for rapid assembly on site.
However, RAAC also has some limitations:
Lower strength: Even though it's reinforced, RAAC generally has a lower compressive strength compared to regular concrete. This means that it may not be suitable for certain structural applications.
Sensitivity to moisture: RAAC can be susceptible to moisture penetration, reducing its lifespan if not properly managed or protected.
Despite its advantages, RAAC has seen a decline in popularity in some parts of the world due to concerns about its long-term durability and incidents where failures occurred. If considering its use, it's important to consult with professionals familiar with its properties and potential limitations.
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#concrete #construction #reinforcedconcrete
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