What are the different types of asphalt (grades)?

The most common types of asphalt mixture are Class A, Class B, Class B Modified and Class G. Class A has the largest aggregate and the least amount of fines. It is intended for heavy road construction and is more porous after completion. Class G (or playground mix) is a mix that uses all fines. It has a very smooth finish, but lacks structural integrity for much weight-bearing capacity. It is appropriate for asphalt walkways or paths. Class B modified is the most common mix and is appropriate for most light-use and commercial applications. It has a medium-sized aggregate and an abundance of fines which provides both structural integrity and a smooth finished product.