Kevin MacDonald PhD, PE, FACI is the principal engineer with Beton Consulting Engineers in Minnesota. His practice focuses on durability of infrastructure, mass concrete, and production of concrete with high replacement levels. He is a member of several ACI and ASTM committees. He is a licensed professional engineer in Minnesota and Ontario Canada. Contact MacDonald via email.
How we buy and sell aggregate is quite different, and it can lead to trouble. Most specifications require coarse and fine aggregate to conform to the requirements, including the gradation, of ASTM C33.