Patent examiners granted the U.S. Air Force a 20-year utility patent for a strong, quick-setting concrete using fly ash on Tuesday.
Newly minted U.S. Patent 10,800,703 lists Jeffery Eichler, Kara Griffith, Derek Lovingood, and Michael Henley as the inventors of the “cementitious material.” The team is part of the Air Force Civil Engineer Center at Tyndall Air Force Base in Florida.
According to the patent, the Air Force’s invention fills the need for a pavement “using relatively small quantities of commercial products combined with indigenous or locally sourced materials. Such a need is particularly desirable in circumstances requiring rapid repair of roads, runways, and the like in the event of natural disasters such as hurricanes or earthquakes.”The Air Force also said it’s helpful to be able to fill in the crates in bombed runways.READ MORE
The finely divided residue that results from the combustion of ground or powdered coal and that is transported by flue gases from the combustion zone to the particle removal system.
Fly ash is a by-product from the combustion of pulverized coal, and is widely used as an ingredient in hydraulic-cement concrete. Because it improves many desirable properties of concrete, it is introduced either as a separately batched material or as a component of blended cement. Fly ash reacts with the hydrating hydraulic cement to form a cementing medium.
ACI Concrete Terminology