3/9/2024 0 Comments Concrete slab crack inducers![]() Think how bad you feel when part of you wants to do one thing and another part wants to do something else! Concrete feels the same way. Internal restraint is created when one part of a slab shrinks more than another, or shrinks in a different direction. Joints also let concrete shrink as it dries-preventing what's called internal restraint. Joints allow one concrete element to move independently of other parts of the building or structure. Restraint simply means that the concrete element (whether it's a slab or a wall or a foundation) is not being allowed to freely shrink as it dries or to expand and contract with temperature changes or to settle a bit into the subgrade (see Subgrades and Subbases). The Purpose of Joints in Concrete SlabsĪs concrete moves, if it is tied to another structure or even to itself, we get what's called restraint, which causes tensile forces and invariably leads to cracking. Different joints in concrete slabs all have the same bottom-line purpose of preventing cracks.
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