What is a limitation of aggregate in construction?

The limitation of aggregate in construction that is most relevant is its ability to only allow a specific spacing between side forms, which refers to the amount of compressive strength that a certain aggregate can accommodate. This is important in the mixing process for concrete, as the placement and spacing of the aggregates affect the strength and durability of the final product.

In a construction scenario, if the aggregate allows too much space between forms, it may lead to a weaker concrete structure, which could compromise the integrity of the building. Proper management of aggregate spacing is essential to achieve the desired structural properties, ensuring durability and stability in construction.

While the other options may have some degree of truth, they don't effectively illustrate the limitations of aggregates. For example, while aggregates do hold some moisture, it’s often managed through appropriate engineering methods and doesn't inherently limit their use in construction. Similarly, the necessity for large quantities of aggregate is more a specification of project need than a limitation, and aggregates can certainly be used in various environments, both indoor and outdoor.