why does asphalt change colour?


when it’s poured it’s blackish, but then changes colour overtime.

In: Chemistry

It’s a mixture or very black tar and aggregate rocks that might usually aren’t black.

In the truck, it’s really well mixed, and so when it’s applied you see a nice, uniform coating. Over time, the softer tar is worn off and you see the rocks. If the rocks are grey, or worse white, this changes the overall color.