Teräsvahvikkeet

Teräsvahvikkeet, commonly known as rebar, are steel bars or mesh used as a tension device in reinforced concrete structures to strengthen and aid the concrete under tension. Concrete is strong in compression but weak in tension. Rebar is embedded in concrete to take up the tensile stresses that the concrete cannot withstand. This composite material, known as reinforced concrete, is a fundamental building material used worldwide.

The use of steel reinforcement dates back to the mid-19th century. Early forms included iron rods and chains. Modern rebar is typically made of carbon steel and comes in various diameters and surface textures. Deformed rebar, which has ridges or lugs, is commonly used to improve the bond between the steel and the concrete. This enhanced bond prevents slippage and ensures the structural integrity of the reinforced element.

Rebar is essential in constructing a wide range of structures, including buildings, bridges, dams, and roads. Its application prevents concrete structures from cracking and failing under tensile loads, which can be caused by factors such as wind, earthquakes, and the weight of the structure itself. The proper placement and detailing of rebar are critical for the performance and safety of reinforced concrete construction. Standards and codes govern the types, sizes, and placement of rebar to ensure predictable structural behavior.