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Learn about how we test the hardiness of and maintenance requirements for hardscaping materials. ... See MoreSee Less

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We’ve all heard it: Concrete always cracks! Although that’s not 100% true, concrete does crack frequently enough that anyone working with it should understand why and how to repair cracks when necessary. Don’t let cracks ruin your good work!

Cracks form in a slab when there is a tension force in the concrete that’s greater than the concrete’s strength in tension. Concrete’s direct tensile strength is much less than its compressive strength—about 10%. So when it’s pulled too hard, it cracks. Cracks also can propagate, or continue to grow, at even lower stresses. The tension can have of a lot of causes that are external or inside the concrete itself, such as internal pressure caused by freezing water or expanding aggregates.

In many cases, cracks don’t detract from performance. Plastic shrinkage cracks in a slab’s surface often have no negative effect on performance and may be objectionable only because the owner doesn’t like the way they look. Shrinkage cracks that aren’t offset vertically or are unstable under heavy loads are really nothing more than natural contraction joints. And reinforced concrete actually needs to crack before the reinforcement begins to work, although with heavy reinforcement the cracks can be too narrow to easily see.
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Versa-lok walls (pix 1) have been around for 25 plus years in western pa what you think of this type wall instead ?? (last 2 Pixs ) ... See MoreSee Less

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Remove old paint and grinding a floor for a customer that is going to attempt to stain their sixty-year-old floor . ... See MoreSee Less

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