Vulcan Materials Company is a supplier of construction aggregates (primarily crushed stone, sand and gravel) and a producer of asphalt mix and ready-mixed concrete. The Company operates through four segments: Aggregates, Asphalt Mix, Concrete and Calcium. The Aggregates segment produces and sells aggregates (crushed stone, sand and gravel, sand, and other aggregates) and related products and services (transportation and other). The Company produces and sells asphalt mix in Arizona, California, New Mexico and Texas. The Company produces and sells ready-mixed concrete in Georgia, Maryland, New Mexico, Texas, Virginia, Washington District of Columbia and the Bahamas. The Calcium segment consists of a Florida facility that mines, produces and sells calcium products. As of December 31, 2016, it had 337 active aggregates facilities. The Company sells aggregates that are used as ballast for construction and maintenance of railroad tracks.