When might compressive strength cylinders for concrete pavement or structures be required?

The requirement for compressive strength cylinders for concrete pavement or structures is primarily to assess whether the concrete has achieved sufficient strength for the safe removal of forms. When concrete is poured, it does not immediately reach its full strength; thus, testing through compressive strength cylinders enables engineers and inspectors to determine if the concrete has cured enough to support the load and allow for the removal of forms without compromising the structural integrity. This process is essential to ensure safety and proper construction practices.

While other options involve aspects related to concrete, they do not directly align with the specific circumstances under which compressive strength testing is imperative. Aesthetic evaluations focus more on visual qualities rather than structural strength, and quality control during mixing pertains to the properties of the materials before curing. Similarly, testing before any concrete is poured would not be applicable as the compressive strength cylinders can only be created once the concrete is in place and has begun to cure.