ROLLA, Mo. (AP) - A researcher at Missouri University of Science and Technology is studying ways to use more of the ash produced by coal-fired power plants in concrete.
Assistant engineering professor Jeffery Volz says recent studies have shown that higher amounts of fly ash than used previously can result in strong and durable concrete.
Using fly ash in concrete keeps it out of ponds and landfills. It also reduces carbon dioxide emissions because the cement it replaces is created by heating limestone and other materials.
The downside is that fly ash slows the setting and hardening rates of concrete, especially in cold weather.
Volz is working with the Missouri Department of Transportation to develop guidelines for the proper application of high-volume fly ash concrete in projects such as bridges and roadways.