ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,741,906, issued on Sept. 22.

"Pozzolan-based additive agent and uses thereof" was invented by Philippe Fortin (Mirabel, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "An additive agent comprising pozzolan and methylcellulose, for the preparation of a concrete mixture of a hygroscopic vegetal-based concrete material comprising lime and the additive agent is described herein. The lime may be hydrated lime and the pozzolan may be a metakaolin. Proportions of each element are between 50% to 80% by weight of lime, between 20% and 50% by weight of pozzolan and between 0.3% and 1.5% by weight of methylcellulose. A concrete mixture and a solid concrete ...