US 11,970,422 B2
Composite cement with improved reactivity and method for manufacturing it
Frank Bullerjahn, Heidelberg (DE); Sigum Kjaer Bremseth, Heidelberg (DE); Kjell Skjeggerud, Heidelberg (DE); and Wolfgang Dienemann, Heidelberg (DE)
Assigned to HCONNECT 2 GMBH, Heidelberg (DE)
Filed by HConnect 2 GmbH, Heidelberg (DE)
Filed on Apr. 25, 2022, as Appl. No. 17/728,132.
Claims priority of application No. 21170683 (EP), filed on Apr. 27, 2021.
Prior Publication US 2022/0340488 A1, Oct. 27, 2022
Int. Cl. C04B 14/14 (2006.01); C04B 14/28 (2006.01); C04B 28/02 (2006.01); C04B 28/04 (2006.01); C04B 28/06 (2006.01); C04B 28/16 (2006.01); C04B 40/00 (2006.01)
CPC C04B 14/14 (2013.01) [C04B 14/28 (2013.01); C04B 28/025 (2013.01); C04B 28/04 (2013.01); C04B 28/06 (2013.01); C04B 28/065 (2013.01); C04B 28/16 (2013.01); C04B 40/0042 (2013.01); Y02P 40/10 (2015.11)] 44 Claims
 
1. A composite cement comprising
a hydraulic cement or a caustic activator,
a hyaloclastite as pozzolan containing 45-62 wt.-% SiO2, 10-20 wt. % Al2O3, 6-15 wt.-% Fe2O3, 7-15 wt.-% CaO, 7-15 wt.-% MgO, 1.5-4 wt. % (K2O+Na2O), and having 0-5 wt.-% loss on ignition at 950° C. and ≥50 wt.-% X-ray amorphous phase, and
a carbonate filler with an at least bimodal particle size distribution adapted to provide a slope n in a Rosin-Rammler-Sperling-Bennett distribution curve of ≤1.15 in a particle size distribution of the composite cement, wherein an amount of pozzolan and carbonate filler together ranges from 15 to 50 wt.-%.
 
32. A method for manufacturing a composite cement according to claim 1 comprising the steps:
providing a hydraulic cement or a caustic activator,
providing a hyaloclastite as pozzolan containing 45-62 wt.-% SiO2, 10-20 wt. % Al2O3, 6-15 wt.-% Fe2O3, 7-15 wt.-% CaO, 7-15 wt.-% MgO, 1.5-4 wt. % (K2O+Na2O), and having 0-5 wt.-% loss on ignition at 950° C. and 50 wt.-% X-ray amorphous phase,
providing a carbonate filler with an at least bimodal particle size distribution, ground partly or fully separately from the hydraulic cement and the pozzolan, adapted to provide a slope n in a Rosin-Rammler-Sperling-Bennett distribution curve of ≤1.15 in a particle size distribution of the composite cement, and
blending the hydraulic cement or caustic activator, the pozzolan and the carbonate filler to provide the composite cement, wherein from 15 to 50 wt.-% pozzolan and carbonate filler together are used.