When is it most critical to check rebar placement accuracy?

Checking rebar placement accuracy just before pouring concrete is essential because this is the last opportunity to ensure that the rebar is positioned correctly in accordance with the design specifications. At this stage, any adjustments or corrections can be made to guarantee that the rebar provides the intended structural reinforcement for the concrete. This step is critical since once the concrete is poured, it becomes much more difficult, if not impossible, to adjust or reposition the rebar without compromising the integrity of the structure.

The accuracy of rebar placement significantly impacts the overall strength and performance of the concrete structure. Properly positioned rebar is crucial for controlling stress and preventing cracking, which can lead to structural failure. Therefore, this stage is when workers must conduct thorough checks to measure the placement against the plan, ensuring that everything is aligned correctly before the concrete is mixed and poured.

Checking after pouring concrete or during the curing phase does not allow for any changes to be made on the rebar, as the concrete will already have enveloped the rebar. Once concrete has set, any inaccuracies would be permanently encapsulated, making it impossible to rectify without significant demolition or retrofitting work.