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Spacer Function
Concrete spacers must be made of a material that shares expansion and contraction characteristics with concrete so they bond naturally and design so that they hold reinforcing bars firmly in place either horizontally or vertically. When constructing concrete forms, whether it is a slab floor, a load-bearing wall or a bridge, reinforcing bars are placed at certain positions to support the weight of the concrete. The positioning of these bars depends on the volume of concrete required. More reinforcement, or cover, is required for higher volumes of concrete. The building codes that determine what is needed and where are designed to ensure the maximum strength for each application. Spacers are an added security to make sure the re-bar in stays in these positions.
Concrete Spacers
Concrete spacers are made from fiber-reinforced cement. They’re typically categorized as single, double and triple cover spacers. Because they have the same expansion characteristics as the concrete that surrounds them, this type of spacer bonds to eliminate potential weak spots in the finished concrete. Concrete spacers resemble small blocks of concrete, with varying widths and profiles depending on the number of reinforcements they’re securing. Single cover concrete spacers are used primarily in horizontal concrete reinforcement. Double cover concrete spacers are used for vertical and horizontal spacing of reinforcement bars, while triple cover concrete spacers are used primarily in vertical reinforcement, but can also be used in horizontal applications as well. Concrete line spacers, also called bar spacers, look like long, rectangular concrete bars and are laid on the sub-base of the concrete form. These make for faster placement of reinforcements and are typically used to support large amounts of reinforcement in heavy applications.
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