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2 Controlling Random Cracking of Concrete Slabs
Concrete slab cracks are unavoidable, but they can be controlled. Cracking is random in nature and occurs across the surface of the slab, but it is limited only to the surface of the slab. The concrete slab is not going to crack in any specific pattern. The problem is that there is not a control to prevent this random cracking from happening in the first place. In fact, the slab will crack in a random pattern and it is desirable for that to be the case. The most common type of crack in concrete slabs is the hairline crack. A hairline crack is a crack that is less than 1/8 inch. The hairline crack can occur in any direction, but it is most likely to occur in the direction of the tensile stresses. This is because the hairline crack is easier to control than the random crack. Hairline cracks can be controlled if the slab is reinforced with a continuous reinforcement of steel or strand construction. If a continuous reinforcement is used, it is called a grid or continuous beam. The grating reinforcement is placed in the center of the slab and each individual section is reinforced to contain tensile stresses. Random cracks can be controlled by creating a weak plane or panel. Cracks that occur perpendicular to the plane are more difficult to control because the crack has to occur across the surface of the concrete and then it has to penetrate the concrete to enter the plane. 827ec27edc