A rebar spacer is a device that secures the reinforcing steel or "rebar" in reinforced concrete structures as the rebar is assembled in place before the final concrete pour. The spacers are left in place during the pouring to keep the rebars in place. After the pour, the spacers become a part of the structure.
Point rebar spacer Linear rebar spacer A concrete spacer with a plastic clip in use on the side of the formwork. A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wallThe main categories of rebar spacers are:
Rebar spacers can be divided into three raw materials categories:
Each of these categories offers advantages which are specific to certain uses.
Plastic spacers (manufactured from polymers) offer a classic, fast, easily laid on form-works solution. The newest solutions focus on non-PVC spacers, which bear an added environmental value.
Concrete spacers (manufactured from fiber reinforced concrete) are used in heavy weight applications, increased fire safety requirement construction (such as tunnels), and pre-cast concrete systems.
Metal spacers are typically used as distance keeping between more than one layer of rebar reinforcement.
The concrete spacers use the same raw material as the pour, which improves the water tightness and strength of the concrete. Plastic spacers have the advantage of low-cost production and fast processing.
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