Reentrant corners in concrete slabs are highly susceptible to developing unsightly cracks. The Sanders Companies has a solution to minimize, or even eliminate, these concerns. A reentrant corner is anywhere within a slab foundation where a fixed object forms an angle less than 180 degrees into the body of the slab. A common example of this is at an inside corner of a buildings foundation. Other locations where unsightly cracks can occur are the corners of interior load supporting walls or columns. These two crack locations often develop during the initial curing stage shortly after the slab has been poured.
Concrete, though extremely effective in compression, is not capable of handling moment-driven tension loads and will develop cracking where the highest concentrations of tension loading occurs. Whether it is normal drying shrinkage, slab movement, or non-uniform loading tension stresses develop and cracking follows. Even in the most pristine building conditions, tension stresses cannot be completely eliminated.
By using the Crack Control Collar, homebuilders and contractors can rest assured knowing the cracking caused by tension stresses will be minimized, if not completely eliminated. This patented, recycled, made in the USA product works by isolating the areas where high-tension stresses develop. The pre-formed curvature ultimately eliminates the slab's reentrant angle, thus eliminating the location where the cracking would typically begin. By isolating the corner, the slab is allowed to move normally outside the high tension zone, the chances of cracking are vastly reduced if not eliminated.
SR Products/The Sanders Companies