One of the main drawbacks of using certain coal combustion ashes, such as those from fluidized bed combustion (FBC) facilities, is that over time they may expand, crack, and lose strength.  Western Research Institute under sponsorship of the U.S. DOE has developed a process for stabilizing expansive ashes.  The WRI process uses specialty chemicals to modify the hydration reaction chemistry of the ashes, improving their dimensional stability and strength. 

Effect of Treatment on the Expansion of Circulating Fluidized Bed Combustion Ashes.

Results from laboratory testing suggest that the WRI ash stabilization process can be used with most of these ashes.  For utilities and ash marketers, the process offers an economical option for stabilizing ashes for disposal or converting unusable ash into a stable material that can be sold for use in the construction industry.

Licensing opportunities are available.