Kitty Hoyle’s success at owning and operating a concrete plant in a man’s world is noteworthy. She is one of the very few women who is the president of a concrete producing operation. But what is even more newsworthy about Hoyle’s success is that her firm, Wellington Hamrick, of Boiling Springs, N.C., is an independent company in a market dominated by large producers, and she’s winning by doing things her way.