How Aggregate Size Affects Concrete Mix

Aggregate size affects how concrete is mixed, placed, and strengthened. The maximum size of aggregate is defined by the sieve aperture that retains 15 percent or more of the particles in the sample. This size choice helps determine the concrete’s water demand, workability, and final strength.

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Conventionally, the maximum aggregate size is determined by the sieve size that retains at least 15 percent of the particles in a sample set.

As the maximum aggregate size increases, the surface area per unit mass that must be wetted or coated by the cement paste decreases, improving the workability of concrete.

However, beyond a s...