What can excessive amounts of filler in asphalt lead to?

Excessive amounts of filler in asphalt can lead to cracking because the balance between the binder and the aggregates is disrupted. In an asphalt mixture, the binder is designed to provide flexibility and cohesion, while the aggregates provide strength and stability. When too much filler is added, it can create an overly stiff mixture that lacks the necessary flexibility to expand and contract with temperature changes. As a result, when the asphalt is subjected to stress from traffic or environmental factors, it is more likely to develop cracks.

In contrast, pooling refers to water accumulation that may occur due to improper drainage or uneven surfaces, while bubbling typically involves air trapped in the asphalt during installation, leading to blisters on the surface. Chipping pertains to the loss of small pieces from the surface due to wear and tear or impact, which is not directly linked to the composition of filler in the asphalt. Therefore, excessive filler primarily leads to the inability of the material to flex, which manifests as cracking.