Why is particle shape analyzed in aggregate testing?

Analyzing particle shape in aggregate testing is crucial because it directly impacts the performance characteristics of concrete. The shape of the aggregate particles can affect the workability, which refers to how easily the concrete can be mixed, placed, and finished. For instance, angular aggregates tend to interlock more and can require more water or admixtures to achieve the desired workability compared to round aggregates, which flow more easily.

Furthermore, the particle shape influences the concrete's strength. The interactions between the particles, including their shape and surface texture, play a significant role in how effectively they bond with cement paste. Well-shaped aggregates enhance the overall strength and durability of the concrete mix, minimizing issues such as segregation, bleeding, and shrinkage.

Considering the options provided, the focus on workability and concrete strength highlights the importance of understanding how particle shape affects these properties during the mix design process.