Methods of manufacture and use for hydraulically bonded cement
First Claim
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1. A method for preparing a cementitious article from a hydraulic cement composition, the method comprising the steps of:
- (a) applying pressure to a powdered hydraulic cement composition within a mold such that air within the powdered hydraulic cement composition is substantially removed and the powdered hydraulic cement composition is formed into a mechanically self-supporting structure of a near net final position substantially corresponding to a desired article shape;
(b) removing the mechanically self-supporting structure from the mold; and
(c) hydrating the mechanically self-supporting structure by contacting the structure with an aqueous solution without substantial mechanical mixing of the cement composition and aqueous solution, thereby forming the cementitious article.
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Abstract
The present invention relates to hydraulically bonded cement compositions and methods of manufacture. Hydraulically bonded cement compositions and methods of manufacture include materials prepared by manipulating under pressure powdered hydraulic cement compositions using known or novel powder packing, casting, or expanding techniques, such that air within the powdered hydraulic cement is successfully removed while the cement is formed into a self-supporting near net final position. Thereafter, the formed hydraulic cement article is hydrated without mechanical mixing of the cement and water.
127 Citations
125 Claims
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1. A method for preparing a cementitious article from a hydraulic cement composition, the method comprising the steps of:
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(a) applying pressure to a powdered hydraulic cement composition within a mold such that air within the powdered hydraulic cement composition is substantially removed and the powdered hydraulic cement composition is formed into a mechanically self-supporting structure of a near net final position substantially corresponding to a desired article shape; (b) removing the mechanically self-supporting structure from the mold; and (c) hydrating the mechanically self-supporting structure by contacting the structure with an aqueous solution without substantial mechanical mixing of the cement composition and aqueous solution, thereby forming the cementitious article. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for preparing a hydraulically bonded composite article comprising the steps of:
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(a) applying pressure to a powdered hydraulic cement composition within a mold such that air within the powdered hydraulic cement composition is substantially removed and the powdered hydraulic cement composition is positioned into a mechanically self-supporting structure of a predetermined configuration corresponding substantially to a desired configuration of the composite article, the powdered hydraulic cement composition being capable of forming a continuous matrix having powdered hydraulic cement particles and aggregate particles dispersed therein, the powdered hydraulic cement particles and the aggregate particles having a density and a particle size distribution; (b) removing the mechanically self-supporting structure from the mold; and (c) hydrating the mechanically self-supporting structure by contacting the structure with an aqueous solution without substantial mixing of the cement particles and the aqueous solution, thereby forming the hydraulically bonded composite article. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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73. A method for preparing a hydraulically bonded article shaped in a predetermined configuration, the method comprising the steps of:
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(a) applying pressure to a powdered hydraulic cement composition within a mold such that air within the powdered hydraulic cement composition is substantially removed and the powdered hydraulic cement composition is positioned into a mechanically integral self-supporting structure of a predetermined configuration corresponding substantially to a desired configuration of the hydraulically bonded article; (b) removing the mechanically integral self-supporting structure from the mold; and (c) hydrating the mechanically integral self-supporting structure with an aqueous solution having at least one component that modifies the hydration of the powdered hydraulic cement composition, thereby forming the hydraulically bonded article, the hydrating step being performed without substantial mechanical mixing of the powdered hydraulic cement composition and the aqueous solution. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118)
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119. A method for preparing a hydraulically bonded article shaped in a predetermined configuration, the method comprising the steps of:
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(a) applying pressure to a powdered hydraulic cement composition having a predetermined polynary size distribution within a mold such that air within the powdered hydraulic cement composition is substantially removed and the powdered hydraulic cement composition is positioned into a mechanically self-supporting structure of a predetermined configuration corresponding substantially to a desired configuration of the hydraulically bonded article; (b) removing the mechanically self-supporting structure from the mold; and (c) hydrating the mechanically self-supporting structure with an aqueous solution without substantial mechanical mixing of the powdered hydraulic cement composition and water, thereby forming the hydraulically bonded article. - View Dependent Claims (120, 121, 122, 123)
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124. A method for preparing a hydraulically bonded article from a hydraulic cement composition shaped in a predetermined configuration, the method comprising the steps of:
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(a) applying pressure to and controlling the density of a powdered hydraulic cement composition within a vessel such that air within the powdered hydraulic cement composition is substantially removed, thereby forming the hydraulic cement composition into a mechanically self-supporting structure having a predetermined configuration corresponding substantially to a desired configuration of the hydraulically bonded article; (b) removing the mechanically self-supporting structure from the vessel; (c) exposing the powdered hydraulic cement composition to water so as to hydrate the cement composition without substantial mechanical mixing of the cement composition and the water; and (d) allowing the hydrating cement composition to cure into the hydraulically bonded article. - View Dependent Claims (125)
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Specification