A professional who operates concrete, asphalt, or sand and gravel plant to batch, crush, or segregate materials used in construction. Respnsibilities include:

• Moves controls on panelboard or control board to heat, dry, and mix ingredients, such as asphalt, sand, stone, and naphtha, to produce asphalt paving materials; to weigh and mix aggregate, cement, and water to produce concrete; or to control feeding, crushing, and sifting machinery in sand and gravel plant.
• Observes gauges, dials, and operation of machinery to ensure conformance to processing specifications.
• May repair machinery, using handtools, power tools, and welding equipment.
• May be designated according to type of plant operated as asphalt-plant operator; concrete-batch-plant operator; sand-and-gravel-plant operator; or according to machine function as crusher operator.