DIY Builds
DIY Builds
Photo: Ryutaro Tsukata
Rebar, or reinforcing bar, is a common feature of many concrete applications. Its primary purpose is to increase the tensile strength of the concrete, helping it resist cracking and breaking. With greater tensile strength, concrete is better able to resist breaking under tension.
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Rebar, or reinforcing bar, is a common feature of many concrete applications. Its primary purpose is to increase the tensile strength of the concrete, helping it resist cracking and breaking. With greater tensile strength, concrete is better able to resist breaking under tension. In a recent article about concrete control joints, we wrote about how these joints exist to help ensure that concrete cracks only in the most desirable places. After all, it’s inevitable that concrete will crack, and control joints help the concrete do so only in straight lines at the joints. Rebar holds a similar function in that the steel provides strength to a concrete structure, distributing weight with the aim that any cracking that does occur doesn’t result in structural damage. Concrete is an incredibly strong and durable material. (Concrete laid by the Romans, for example, has held firm for thousands of years.) Concrete performs especially well under compression forces (vehicles driving on a concrete driveway or road, for example), but it needs assistance to bear the weight of tension forces, such as weight in the middle of a beam that’s supported on each end but not in the middle. Consider that concrete with a compression strength of 4,000 psi (pounds per square inch) might only have a tensile strength of just 400 psi, according to the National Precast Concrete Association. Tensile strength is not concrete’s strong suit! Concrete also sometimes needs support against expansion and contraction forces that occur naturally with changes in temperature. That’s where rebar comes into play. What’s beneath the surface of the concrete is as important as what you see on the surface. When you see our beautifully finished concrete around Whatcom and Skagit counties, know that underneath that concrete flatwork is a well-engineered rebar structure that gives the concrete slab, wall or curb or the strength it needs.
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Ventilation is essential in summer houses. For one, it ensures that the air is fresh and free of smells. That way, people in the home do not suffer...
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