The “aggregate effect” refers to the influence of aggregate properties on the behavior and performance of concrete, particularly under severe environmental conditions. Aggregate, which includes materials such as gravel, sand, and crushed stone, makes up a significant portion of concrete and largely determines its strength, durability, and resistance to environmental stressors. The type, quality, and proportion of aggregate used can affect everything from the concrete’s compressive strength to its resistance to freeze-thaw cycles, making it a critical factor in the material’s overall performance.