What happens when a pour gets wheelbarrowed instead
Concrete starts setting from the moment it is batched, and it does not wait for your crew. When a pour that should take an hour takes four because every load is being walked across a yard, the first concrete placed is already stiffening before the last arrives — and the two do not knit together. That is a cold joint: a plane of weakness running through a slab that was supposed to be monolithic, and the place it will eventually crack. You also pay for it in your yard, because the wheelbarrow route becomes ruts through the lawn and stains down the driveway you were trying to protect.



