What is the primary purpose of control joints in concrete driveways?

The primary purpose of control joints in concrete driveways is to reduce random cracking. Concrete is a material that tends to expand and contract with temperature changes and drying. As it cures, it also shrinks. Without control joints, this shrinkage can lead to uncontrolled cracking.

Control joints are intentionally designed grooves that are placed in the concrete surface at regular intervals. They create a predetermined place for the cracks to occur, which helps to manage the stresses within the concrete. By guiding the cracks along these lines, control joints minimize the visibility of any cracking and maintain the structural integrity of the driveway.

In essence, they help in maintaining the overall durability and appearance of the concrete surface, which is why their role in reducing random cracking is essential for the longevity of the driveway.