Here's some asphalt that was scanned using my custom built scanning box and processed using Substance Designer's Scanning node generate the normal map. From the scan I get the Diffuse and Normal, other maps are created in Substance.
You can see the process I went though building the scanner here in my blog.
Part1 - https://www.artstation.com/daverig/blog/rDXw/building-a-surface-scanning-box-part-1
Part2 - https://www.artstation.com/daverig/blog/A7dn/building-a-surface-scanning-box-part-2
Part3 - https://www.artstation.com/daverig/blog/DMK3/building-a-surface-scanning-box-part-3