	US 12,264,100 B2
	Use of a clay for producing a pozzolanic material
Olivier Martinage, Lyons (FR); and François Hue, Bourgoin Jallieu (FR)
Assigned to VICAT, Paris la Defense (FR)
Appl. No. 17/262,869
Filed by VICAT, Paris la Defense (FR)
PCT Filed Aug. 2, 2019, PCT No. PCT/EP2019/070860 § 371(c)(1), (2) Date Jan. 25, 2021, PCT Pub. No. WO2020/025783, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 1857273 (FR), filed on Aug. 3, 2018.
Prior Publication US 2022/0363601 A1, Nov. 17, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C04B 18/02 (2006.01); C04B 14/06 (2006.01); C04B 14/10 (2006.01); C04B 14/30 (2006.01); C04B 28/04 (2006.01); C04B 33/13 (2006.01); C04B 40/00 (2006.01); C04B 103/00 (2006.01)

CPC C04B 18/021 (2013.01) [C04B 14/06 (2013.01); C04B 14/303 (2013.01); C04B 14/308 (2013.01); C04B 28/04 (2013.01); C04B 33/131 (2013.01); C04B 40/0042 (2013.01); C04B 2103/0088 (2013.01)]

14 Claims

1. A method for preparing a pozzolanic material, consisting essentially of

optionally drying a pre-calcined clay, wherein the pre-calcined clay comprises:

less than 25% by weight of kaolinite,

at least 20% by weight of at least one of muscovite and illite,

wherein the at least one of muscovite and illite has the highest content of all minerals in the pre-calcined clay, and

wherein a weight ratio of the at least one of muscovite and illite to the kaolinite is greater than 1,

following any optional drying, optionally grinding the pre-calcined clay until the pre-calcined clay has a median diameter less than or equal to 25 μm,

calcining the pre-calcined clay to obtain a calcined clay, and

optionally disagglomerating the calcined clay until a median diameter of 10 μm to 20 μm is reached.