Why is it important to know the absorption capacity of an aggregate?

Understanding the absorption capacity of an aggregate is crucial because it directly influences the mix design of concrete or asphalt formulations. Aggregates absorb water depending on their porosity and texture, which can affect the water-cement ratio in concrete or the bitumen content in asphalt mixes.

By knowing the absorption capacity, a technician can calculate how much additional water may be needed in the mix to achieve desired workability and strength. If the absorption is not accounted for, there could be unintended consequences such as reduced performance and durability of the final product. In summary, the absorption capacity not only impacts the water needed for the mix but also plays a significant role in ensuring the final product meets specified requirements for strength and durability, making it a pivotal factor in aggregate selection and mix design.