Since we have recently begun to, and in coming days will more extensively, extol the many, and rather surprising, virtues of Coal-derived fly ash, we wanted herein to establish that some of it's uses are actually well-known among some at least of the people who should know, people who seem to be willing to assist in the promotion of its productive employment.
The initial link in this dispatch should take you to a US Federal Highways Administration web site, labeled:
"Infrastructure Materials Group: Fly Ash";
and, what they have to tell us is rather enlightening, as we see, with comment inserted and other links appended, in excerpts explaining that: