Why is concrete separated by strength for pricing?

Concrete is separated by strength for pricing because different strengths require varying materials and additives that directly influence the cost of production. Higher strength concrete typically necessitates the use of specific aggregates, cement types, and admixtures that enhance its performance characteristics, such as durability, workability, and setting times. As the strength classification increases, so does the complexity of the mix design, often leading to increased costs.

Moreover, the use of these specialized materials not only affects the cost of the concrete itself but also the labor and handling methods employed during mixing and pouring. Each strength class must meet specific structural requirements that can further impact pricing, as additional quality control measures and testing may be necessary.

By pricing concrete according to strength, suppliers and contractors can accurately reflect the costs associated with different mix designs, ensuring that project budgets align with the required specifications for the intended structural application.