What should be avoided during concrete work to minimize cracking?

When working with concrete, using control joints is essential for managing cracking. Control joints are intentionally created weak points in the concrete that allow for controlled cracking, which serves to relieve stress that builds up within the slab as the concrete cures and shrinks. Without these joints, the concrete is likely to crack randomly, leading to more severe and uncontrolled issues.

The process of pouring concrete involves hydration and temperature variations, which can cause the material to expand and contract. If control joints are not implemented, the chances of cracks developing at random locations increase, as the concrete lacks the designated paths to relieve this stress. This proactive measure plays a key role in maintaining the integrity of the surface.

In contrast, the other options may involve practices or conditions that can introduce their own challenges associated with cracking. While reinforcing steel provides support and can reduce the likelihood of cracking, working in high temperatures can accelerate hydration and create harsh conditions that may lead to surface defects. The use of retarders helps to manage the setting time but does not directly address the issue of cracking in the absence of control joints. Therefore, omitting control joints stands out as a critical mistake that can significantly worsen the cracking issues in concrete work.