Cement developer secures U.S. patent for alkaline ettringitic powder

Sources: Hoffmann Green Cement Technologies, Paris; CP staff 

After nearly three years of examination, the United States Patent Office has validated the Hoffman Green Cement Technologies H-EVA patent (US 2021/0179492 A1). Promoted as an alternative to portland cement for ready mixed concrete, mortars and plaster, H-EVA encompasses flashed clay sludge, natural or synthetic (flue gas desulphurization) gypsum, plus proprietary chemical “activators and superactivators.” The mineral processing and chemistry yield an alkaline ettringitic powder exhibiting 28-day compressive strength exceeding 8,000 psi and one-fifth the carbon footprint of portland cement—the latter metric attributable to low temperature clay treatment. 

Work on a Hoffman Green Cement production facility foundation began earlier this year with concrete mixes bearing the company’s blast furnace slag-based H-UKR binder.

“The approval of the H-EVA patent in the United States marks a new milestone in our Research and Development roadmap,” according Hoffman Green Cement Technologies co-founders Julien Blanchard and David Hoffman. “This allows us to further protect our intellectual property and strengthen the barriers to entry in our markets. It rewards Hoffmann Green Cement’s investments and the work done by our teams since the creation of the company. Obtaining this patent is also an important step in the Company’s future international development, and especially in the United States.”

H-EVA joins two other clinker-free binders Hoffmann Green Cement has commercialized in its home base of France. H-UKR is based on blast furnace slag and formulated with the company’s activators and superactivators to substitute portland cement at up to 100 percent in ready mixed or precast concrete mix designs. Early H-UKR field applications have been facilitated by Cemex France, with whom Hoffmann Green Cement signed a three-year distribution agreement in 2020. H-P2A (High Performance Alkaline Activation), a geopolymer cement suiting mortar adhesives, has a formulation mirroring H-EVA but using silicate instead of gypsum or FGD. 

Related posts