In 1989, Kentucky engineers built a 750-foot road base using about 80 tons of ponded fly ash; the 11% ash section was reported to perform well against the conventional control

An experimental road base in Kentucky utilized coal plant residue in 1988. Fly ash has been a federal construction material since the 1970s. Encapsulated fly ash in concrete and roads offers safer applications. Decades of data suggest fly ash roads can perform effectively. Proper regulation and monitoring determine successful fly ash infrastructure outcomes.