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I ve been in the concrete floor business for over 30 years.
Concrete floor with control joint. A fresh concrete mixture is a fluid plastic mass that can be molded into virtually any shape but as the material hardens there is a reduction in volume or shrinkage. Properly placed control joints will allow concrete to shrink expand and contract reducing the tendency for it to crack. Contraction control joints are placed in concrete slabs to control random cracking. Control joints in concrete slabs which are poured on grade on top of the ground are placed so that the concrete is in a square or rectangle pattern or shape.
Similar control joints are used with brick or block walls as well as with other types of masonry structures. One thing that i was taught in my years as a concrete finisher is that there are two things in life that are certain the first is of course death and the second is concrete is going to crack. In other words when the concrete does shrink and crack the control joint is placed so that the slab will crack on a. A joint cut into a slab to ensure that as the concrete slab.
In other words if the concrete does crack you want to have an active role in deciding where it will crack and that it will crack in a straight line instead of randomly. When in a rectangle shape the rectangle ratio seldom exceeds a length to width ratio of 1 5 to 1. A control joint or contraction joint is intended to induce cracking in a concrete slab. In this post i want to help you understand the why s when s where.
Think of it as a planned crack. Most of the time we saw the joints using an early entry soff cut saw. Filled in control joints in polished and stained concrete floors provided an easier to clean surface. In wheeled traffic environments the filler will act to protect the joint from future chipping or damage and provide a smoother transition.
Control joints are planned cracks which allow for movements caused by temperature changes and drying shrinkage. The only thing that we can do is control where it cracks with proper concrete control joint spacing and depths at the right time.
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