What does a fluctuation in air temperature affect during asphalt paving?

A fluctuation in air temperature significantly affects the viscosity of the asphalt binder. Viscosity is a measure of a fluid's resistance to flow, and in the context of asphalt paving, it directly influences how the asphalt binder behaves during heating, mixing, and compaction. Warmer temperatures typically reduce the viscosity, making the asphalt binder more fluid and easier to work with, which is crucial for achieving proper mixing and compaction during paving.

As the air temperature falls, the viscosity of the asphalt binder increases, making it thicker and more challenging to handle. This can lead to difficulties in achieving the required compaction levels, which is vital for the longevity and durability of the pavement. Correctly managing the temperature of the asphalt mixture is essential to ensure that it is adequately compacted and that the resulting pavement has the desired properties.

While changes in air temperature may influence the color of the asphalt and potentially have impacts on material costs due to production adjustments, the most direct and immediate effect observed during the paving process itself is the change in the viscosity of the asphalt binder.