Astec Underground laid off 29 workers at its Loudon County facility Monday

Officials with Astec Underground could not be reached for comment. Headquartered in Chattanooga, Astec Industries bought the 300,000-square-foot John Deere Commercial Worksite Products plant in Loudon in 2002 and moved its Tencor Inc. subsidiary there. Astec Industries manufactures equipment for mining, asphalt, mobile asphalt paving and underground pipeline work.