Red Seal Concrete Finisher Practice Exam

What might occur if control joints are not cut in time?

1. Increased strength of the concrete

2. Cracking of the concrete surface

3. Decreased water retention

4. Enhanced finish quality

The correct answer is: Cracking of the concrete surface

When control joints are not cut in time, the primary consequence is the cracking of the concrete surface. Control joints are essential in managing the natural shrinkage and thermal expansion of concrete as it sets and cures. If these joints are not installed appropriately, the concrete will be unable to relieve the stresses that build up during these processes, leading to random cracks. These cracks not only affect the appearance of the surface but can also impact the structural integrity and durability of the concrete. Properly placed control joints provide a defined path for the cracks to occur, thereby minimizing random cracking across the surface. If they are delayed or neglected, it could result in unsightly and potentially damaging fissures in the concrete.