	US 11,673,835 B2
	Sustainable two-component annular grout composition and method for use with a tunnel-boring machine
Michael McDonald, Toronto (CA); Kelly Paul Short, O'Fallon, MO (US); Kenneth A. Berg, North Wales, PA (US); Flavio Ernesto Ribeiro, Plainfield, IL (US); Jim Moran, Philadelphia, PA (US); Peter Marinescu, Toronto (CA); and Daoping Guo, Ontario (CA)
Assigned to PQ, LLC, Malvern, PA (US)
Filed by PQ, LLC, Malvern, PA (US)
Filed on Jan. 31, 2022, as Appl. No. 17/588,942.
Claims priority of provisional application 63/154,134, filed on Feb. 26, 2021.
Prior Publication US 2022/0274881 A1, Sep. 1, 2022
Int. Cl. C04B 28/26 (2006.01); C04B 18/06 (2006.01); C04B 7/02 (2006.01); C04B 14/10 (2006.01); C04B 111/70 (2006.01)

CPC C04B 28/26 (2013.01) [C04B 7/02 (2013.01); C04B 14/106 (2013.01); C04B 18/061 (2013.01); C04B 2111/70 (2013.01)]

14 Claims

1. A grout composition for filling a tunnel annulus comprising:

a. a slurry of fluidized bed combustion ash; and

b. an aqueous alkali metal silicate,

wherein the ratio of aqueous alkali material metal silicate to fluidized bed combustion ash is in the range of 0.2 to 0.55.