How does asphalt cement behave when it cools?

When asphalt cement cools, it solidifies and develops a viscous, adhesive property, functioning much like glue. This behavior is crucial in its role as an essential binding agent in asphalt pavements. As it cools, the asphalt transitions from a hotter, more workable state to a stiffer form that adheres particles together, ensuring the integrity and durability of the pavement structure.

Understanding this behavior is vital for asphalt paving operations, as the cooling process affects the performance and longevity of the pavement. A well-cooled asphalt provides the necessary strength and flexibility, which is why it is essential to manage the cooling process during installation to achieve optimal adhesion and structural integrity.

The other choices do not accurately represent the behavior of asphalt cement when it cools. While some might think of it becoming brittle or evaporating, the essential characteristic to note is its adhesive properties that develop as it transitions to a solid state.