![]() A failure might occur when this reinforcement is visible during an inspection. Engineers typically design this, and reinforcement is rarely visible after the slab cures. The amount of rebar or wire mesh used will affect the tensile strength of the slab. The steel bars are called rebar, short for reinforcement bar, and the mesh is typically called WWR for welded wire reinforcement. It is known as reinforced concrete when it is poured around steel bars or welded steel wire mesh. Steel is added to concrete to improve the concrete’s tensile properties or tensile strength. Concrete can be easily cracked as it is bent or when forces other than pressure are placed on it. Tensile strength is the stretching and bending of the concrete. Conversely, concrete has very poor tensile strength. This means that pressure placed on the concrete can be evenly distributed across the mass with little damage or effect on the concrete. ![]() When concrete reaches its full strength and hardness, its strength is determined by the force placed on it. TensionĬoncrete has excellent compressive strength. In either case, a layer of sand or gravel is added first and compacted before the slab is poured on top of it to help drainage and prevent future movement. Undisturbed soil refers to soil that hasn’t been excavated. Regardless of the slab type, it is placed on undisturbed soil or a compacted base to specifications determined by the building engineer. This helps support the exterior load and prevents frost heave. ![]() A stem wall slab has frost footings or walls that are placed first, and the slab is poured on top or inside of these footings. However, depending on the region, the exterior might be made thicker to prevent frost heaving and provide better support for the exterior walls. A monolithic slab is one whose entire slab is poured as one element and is typically the same thickness across its whole depth. There are two basic types of slabs found in commercial properties: monolithic and stem wall foundations. When concrete is allowed to cure or harden, it can support the load of a building. Concrete is a mixture of Portland cement, sand, gravel, and water. Concrete slab foundations, commonly called slabs, are the most common foundation system found in commercial buildings. ![]()
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