"off-form concrete" refers to concrete that is left exposed after the formwork is removed, without any additional finishing or cladding. This technique is often used for aesthetic purposes, showcasing the natural texture and color of the concrete. Off-form concrete is valued for its raw, industrial look and is commonly used in both interior and exterior applications, such as walls, columns, and ceilings.
Key characteristics of off-form concrete include:
Surface Finish: The finish of off-form concrete depends on the type of formwork used. Smooth formwork materials like steel or high-quality plywood can produce a sleek, polished surface, while rougher materials can impart a more textured appearance.
Color and Texture: The natural color of the concrete is typically retained, although pigments can be added to the mix for different hues. The texture can vary based on the formwork and any treatments applied before pouring.
Formwork Impressions: Any patterns or textures present on the formwork will be imprinted onto the concrete surface. This can be used creatively to add visual interest or branding elements.
Durability and Maintenance: Off-form concrete is durable and requires minimal maintenance. However, it may need sealing to protect against stains and moisture, especially in exterior applications.
Design Flexibility: Architects and designers often use off-form concrete to achieve a modern, minimalist aesthetic. It can be combined with other materials like wood or glass for contrast.
Importance of Off-Form Concrete in Australian Commercial Construction
Off-form concrete is a popular choice in Australian commercial construction projects due to its versatility and ability to achieve a range of surface finishes. However, it requires special precautions to ensure that the work is not stained or discoloured during the curing process, particularly when colour control is critical . Additionally, the concrete must be adequately compacted, and the surfaces must be moist cured for a specified period to achieve the desired finish
