This industry comprises establishments, such as batch plants or mix plants, primarily engaged in manufacturing concrete delivered to a purchaser in a plastic and unhardened state. Ready-mix concrete manufacturing establishments may mine, quarry, or purchase sand and gravel. Establishments primarily engaged in--

Including:

• Central-mixed concrete manufacturing
• Concrete batch plants (including temporary)
• Ready-mix concrete manufacturing and distributing
• Transit-mixed concrete manufacturing
• Truck-mixed concrete manufacturing