What is the best way to ensure the longevity of a concrete slab?

Ensuring the longevity of a concrete slab primarily involves proper mix design and adequate subgrade preparation. The mix design plays a crucial role because it determines the concrete's strength, workability, and durability. The right proportions of cement, water, aggregates, and any admixtures can significantly enhance resistance to cracking, shrinkage, and environmental factors such as freeze-thaw cycles.

Additionally, preparing the subgrade properly is essential. This involves ensuring it is adequately compacted, well-drained, and stable. A solid subgrade prevents settling or shifting after the concrete slab has been placed, thereby reducing the risk of structural issues over time.

While other options may touch on components of concrete work, they do not address these foundational elements that are critical for the long-term performance of a slab, making appropriate mix design and subgrade preparation the best approach for ensuring longevity.