What is the purpose of determining the absorption capacity of aggregate?

Determining the absorption capacity of aggregate is crucial in concrete mix design, as it provides insights into how much water the aggregate can retain. This information is particularly important because it influences the overall water-cement ratio, which affects the strength, durability, and workability of the concrete. Understanding the absorption characteristics ensures that the right amount of water is included in the mix to achieve the desired performance properties without compromising the concrete's integrity.

The absorption capacity helps in adjusting the mix design to accommodate the moisture content of the aggregates, ensuring proper hydration of the cement during the curing process. This leads to optimal concrete properties in terms of density and phase formation, ultimately contributing to the longevity and functionality of the concrete in its intended application.