Final answer:
A small metal or plastic device that supports the wire fabric embedded in the slab at a particular height is known as a bar chair or rebar support. They are used to maintain the position of the reinforcement within concrete, essential for the structural integrity of the concrete slab.
Step-by-step explanation:
The device in question is known as a bar chair or a rebar support. These devices are essential in the construction industry where they are used to maintain the positioning of the rebar or wire mesh within concrete slabs. The primary purpose is to ensure that the reinforcement stays at the correct height, which is crucial for the structural integrity of the finished concrete.
Bar chairs come in various sizes and materials, including metal and plastic, to match the specific requirements of different construction projects. They are strategically placed beneath the wire fabric or rebar before the concrete is poured, supporting them at a designated height above the ground level. This positioning allows the concrete to properly encase the reinforcement and, once set, effectively distributes the loads and stresses the structure will experience.
These spacers are designed to be durable and strong enough to withstand the pouring process and the weight of the reinforcement materials. The correct selection and placement of bar chairs can influence the durability and load-bearing characteristics of the concrete slab, making them a critical component in reinforced concrete applications.