Why grading of aggregates is important in relationship with hardened concrete?

Grading of aggregates is crucial in concrete because it influences the workability, strength, and durability of the hardened concrete. Properly graded aggregates ensure a well-packed mix that reduces voids, allowing for less cement paste and improved mechanical properties. It also affects the water-cement ratio, which is vital for achieving the desired consistency and performance of the concrete. Overall, effective grading enhances the concrete's resistance to cracking, shrinkage, and environmental factors.