ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,534,405, issued on Jan. 27, was assigned to CONSTRUCTION RESEARCH & TECHNOLOGY GMBH (Trostberg, Germany).
"Shotcrete composition" was invented by Tatiana Mitkina (Trostberg, Germany) and Joachim Dengler (Trostberg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A shotcrete composition comprising a) a cementitious binder; b) an ettringite formation controller comprising (i) a glyoxylic acid condensate and/or a glyoxylic acid adduct; and c) an alkali-free, aluminum-based shotcrete accelerator. The invention further relates to a process comprising providing a cementitious composition comprising a) a cementitious binder, and b) an ettringite formati...