![]() Contraction joints can be formed by tooling the joints while the concrete is still plastic or with a saw after the concrete has set. Contraction (Control) Joints: Place contraction joints at the re-entrant corner to create weak planes in the slab that will increase the possibility of cracks forming in the bottom of these contraction joints rather than at ~135 ° from the corner.In this article, I will focus on re-entrant corners in slabs-on-grade. Re-entrant corner cracks are especially prevalent in concrete slabs that are relatively thin in comparison to their plan size. If that solid object is concrete, which is strong in compression but weak in tension, then it will inevitably lead to a crack that will propagate at approximately 135 ° from the corner. In a solid object that is subjected to internal or external loads, re-entrant corners create high stress concentrations. Re-entrant corners are defined as any inside corner that forms an angle of 180 ° or less. One such factor is stress concentrations in the concrete which are evident at re-entrant corners. ![]() To do this, one must have an understanding of the factors that lead to cracking. While this is true, there are measures that can be taken to greatly reduce the magnitude and frequency of cracks. Whether you are a contractor, architect, engineer or simply a home owner with a concrete foundation you have most likely heard the adage that “all concrete cracks”.
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