What does the concept of 'voids' in aggregates refer to?

The concept of 'voids' in aggregates refers to the empty spaces that exist between individual aggregate particles. These voids play a crucial role in determining the overall density and compaction of the material when used in construction or other applications.

When aggregates are compacted, the way the particles fit together and the amount of void space present can significantly impact the strength and stability of the final product, such as a concrete mix or a base layer for paving. A higher amount of voids can lead to lower density and potentially weaker structural integrity, while optimizing the packing of aggregates can minimize voids, leading to better compaction and strength.

Understanding voids is essential in aggregate testing and evaluation, as it directly influences how much aggregate is needed for a particular construction application and affects the performance of the material under load.