AASHTO #8S- 1B STONE AASHTO #8 1B Stone - AASHTO #8 stone, also known as 1B stone, is an aggregate used for driveway, asphalt and concrete mixes. This is the most commonly used stone for concrete mixes. It is also a good base for drainage systems and foundations. It meets standards set forth by the American Association of Highway and Transportation Officials (AASHTO).