	US 12,269,775 B1
	Composition for enhancing the thickening time of hematite-based fly ash geopolymers
Ahmed Elsayed Ahmed Ibrahim Abdelaal, Dhahran (SA); and Salaheldin Mahmoud Ahmed Elkatatny, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jan. 4, 2024, as Appl. No. 18/403,810.
Int. Cl. C04B 28/02 (2006.01); C04B 14/30 (2006.01); C04B 22/06 (2006.01); C04B 24/18 (2006.01); C04B 24/20 (2006.01); C04B 24/42 (2006.01); C04B 40/00 (2006.01); C09K 8/48 (2006.01); E21B 33/138 (2006.01); C04B 103/20 (2006.01); C04B 103/32 (2006.01); C04B 103/50 (2006.01)

CPC C04B 28/021 (2013.01) [C04B 14/308 (2013.01); C04B 22/062 (2013.01); C04B 24/18 (2013.01); C04B 24/20 (2013.01); C04B 24/42 (2013.01); C04B 40/0082 (2013.01); C09K 8/48 (2013.01); E21B 33/138 (2013.01); C04B 2103/20 (2013.01); C04B 2103/32 (2013.01); C04B 2103/50 (2013.01); C04B 2201/50 (2013.01)]

12 Claims

1. A hematite-based fly ash composition, comprising:

a curable component comprising a fly ash binder material (FFA) and a hematite weighting agent present in an amount of 20 to 80% by weight of the fly ash binder material (BWOB);

one or more superplasticizers (SPs) in an amount of 5 to 10% BWOB;

one or more retarders in an amount of 5 to 10% BWOB;

a defoamer in an amount of 0.01 to 0.02% BWOB; and

an aqueous alkaline solution in an amount of 50 to 60% BWOB;

wherein the hematite-based fly ash composition has a thickening time of from 80 to 580 minutes at 195 degree Fahrenheit (° F.), and a plastic viscosity of 150 to 350 centipoise (cP);

wherein the FFA comprises 59 to 63 wt. % SiO₂, 27 to 31 wt. % Al₂O₃, 2.5 to 6.5 wt. % Fe₂O₃, 1 to 4 wt. % K₂O, 1 to 3 wt. % TiO₂, 0.05 to 0.5 wt. % P₂O₅, 0.05 to 0.5 wt. % SO₃, 0.05 to 0.5 wt. % MgO, each wt. % based on a total weight of the FFA, as determined by X-ray fluorescence (XRF) analysis.