US3890157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious systems incorporating particulate adsorbents
Assignee: Individual
•
Filing: 1974-07-24
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Granted: 1975-06-17
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Expires: 1994-07-24
Abstract
Abstract The shrinkage of aqueous hydraulic cement mixtures is eliminated by incorporating therein a porous particulate material, such as an adsorbent such as activated alumina, activated bauxite, activated silica gel, and activated carbon. The particulate adsorbent material has a volume of entrapped gas and is capable of releasing at least a major portion of such gas during setting and early hardening of the cement mixture while in contact with water. The adsorbent gas release is fairly rapid making it particularly advantageous for fast setting cementitious compositions.
Inventors
- 👤 Henry Nash Babcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:35
CPC Classifications
C; C04; C04B; C04B22/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
A CEMENTITIOUS COMPOSITION WHICH, WHEN MIXED WITH WATER, IS CAPABLE OF SETTING INTO A HARD MASS WITHOUT SUBSTANTIAL SHRINKAGE DURING SETTING AND EARLY HARDENING, SAID COMPOSITION COMPRISING A HYDRAULIC CEMENT MIXTURE AND A DRY ADSORBENT-LIKE POROUS PARTICULATE SOLID MATERIAL WITH AN INTERNAL POROSITY IN EXCESS OF 25 PERCENT, AN EXTERNAL VOID FRACTION ABOVE 35 PERCENT AND A SURFACE AREA IN EXCESS OF 100 M2/G, HAVING A VOLUME OF ENTRAPPED GAS WITHIN ITS PORES AND CAPABLE OF PREFERENTIALLY ADSORBING WATER AND CONTROLLABLY DISCHARGING THE ENTRAPPED GAS DURING SETTING AND EARLY HARDENING OF SAID CEMENT MIXTURE WHILE IN CONTACT WITH WATER, IN AN AMOUNT EFFECTIVE TO COUNTERACT THE SHRINKAGE TENDENCY OF THE CEMENTITIOUS COMPOSITION.
Claim 2
Dependent Claim
112 words
A CEMENTITIOUS COMPOSITION WHICH, WHEN MIXED WITH WATER, IS CAPABLE OF SETTING INTO A HARD MASS WITHOUT SUBSTANTIAL SHRINKAGE DURING SETTING AND EARLY HARDENING, SAID COMPOSITION COMPRISING A HYDRAULIC CEMENT MIXTURE AND A DRY ADSORBENT-LIKE POROUS PARTICULATE SOLID MATERIAL WITH AN INTERNAL POROSITY IN EXCESS OF 25 PERCENT, AN EXTERNAL VOID FRACTION ABOVE 35 PERCENT AND A SURFACE AREA IN EXCESS OF 100 M2/G, HAVING A VOLUME OF ENTRAPPED GAS WITHIN ITS PORES AND CAPABLE OF PREFERENTIALLY ADSORBING WATER AND CONTROLLABLY DISCHARGING THE ENTRAPPED GAS DURING SETTING AND EARLY HARDENING OF SAID CEMENT MIXTURE WHILE IN CONTACT WITH WATER, IN AN AMOUNT EFFECTIVE TO COUNTERACT THE SHRINKAGE TENDENCY OF THE CEMENTITIOUS COMPOSITION.
Claim 3
Dependent Claim
12 words
A cementitious composition as claimed in claim 1 further including pressure-calcined gypsum.
Claim 4
Dependent Claim
23 words
A cementitious composition as claimed in claim 1 where the hydraulic cement mixture is one which sets in less than about 90 minutes.
Claim 5
Dependent Claim
36 words
A cementitious composition as claimed in claim 1 wherein said particulate solid material is selected from the group consisting of activated alumina, activated bauxite, activated carbon, activated silica gel, aluminosilicate, bone char, magnesia, and magnesium silicate.
Claim 6
Dependent Claim
22 words
A cementitious composition as claimed in claim 4 wherein the particulate solid material has a moisture content below about 3%, by weight.
Claim 7
Independent Claim
120 words
A method for inhibiting the shrinkage of an aqueous hydraulic cementitious system during setting and early hardening comprising selecting a dry adsorbent-like porous particulate solid material with an internal porosity in excess of 25 percent, an external void fraction above 35 percent and a surface area in excess of 100 m2/g having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and discharging the entrapped gas, incorporating the particulate solid material in the cementitious system at a time no later than the addition of water thereto, and discharging the entrapped gas during setting and early hardening of the cementitious system while in contact with the water to counteract the shrinkage tendency of the cementitious system.
Claim 8
Independent Claim
120 words
A method for inhibiting the shrinkage of an aqueous hydraulic cementitious system during setting and early hardening comprising selecting a dry adsorbent-like porous particulate solid material with an internal porosity in excess of 25 percent, an external void fraction above 35 percent and a surface area in excess of 100 m2/g having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and discharging the entrapped gas, incorporating the particulate solid material in the cementitious system at a time no later than the addition of water thereto, and discharging the entrapped gas during setting and early hardening of the cementitious system while in contact with the water to counteract the shrinkage tendency of the cementitious system.
Claim 9
Dependent Claim
16 words
A method according to claim 6 wherein the cementitious system is one which includes pressure-calcined gypsum.
Claim 10
Dependent Claim
47 words
A method according to claim 6 wherein the cementitious system is one which sets in less then about 90 minutes and the particulate solid material is selected from the group consisting of activated alumina, activated bauxite, activated silica gel, alumino-silicate, bone char, magnesium silicate and activated carbon.
Claim 11
Dependent Claim
21 words
A method as claimed in claim 8 wherein the particulate solid material has a moisture content below about 3%, by weight.
Claim 12
Dependent Claim
86 words
A cementitious composition which, when mixed with water, is capable of setting into a hard mass without substantial shrinkage during setting and early hardening, said composition comprising a hydraulic cement mixture and an adsorbent-like porous particulate solid material having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and controllably discharging the entrapped gas during setting and early hardening of said cement mixture while in contact with water, in an amount effective to counteract the shrinkage tendency of the cementitious composition.
Claim 13
Dependent Claim
86 words
A cementitious composition which, when mixed with water, is capable of setting into a hard mass without substantial shrinkage during setting and early hardening, said composition comprising a hydraulic cement mixture and an adsorbent-like porous particulate solid material having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and controllably discharging the entrapped gas during setting and early hardening of said cement mixture while in contact with water, in an amount effective to counteract the shrinkage tendency of the cementitious composition.
Claim 14
Dependent Claim
36 words
A cementitious composition as claimed in claim 10 wherein said particulate solid material is selected from the group consisting of activated alumina, activated bauxite, activated carbon, activated silica gel, alumino-silicate, bone char, magnesia, and magnesium silicate.
Claim 15
Dependent Claim
22 words
A cementitious composition as claimed in claim 11 wherein the particulate solid material has a moisture content below about 3%, by weight.
Claim 16
Independent Claim
116 words
A method for inhibiting the shrinkage of an aqueous hydraulic cementitious system during setting and early hardening comprising selecting a dry adsorbent-like porous particulate solid material from the group consisting of activated alumina, activated bauxite, activated carbon, activated silica gel, alumino-silicate, bone char, magnesia, and magnesium silicate, having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and discharging the entrapped gas, incorporating the particulate solid material in the cementitious system at a time no later than the addition of water thereto, and discharging the entrapped gas during setting and early hardening of the cementitious system while in contact with the water to counteract the shrinkage tendency of the cementitious system.
Claim 17
Independent Claim
116 words
A method for inhibiting the shrinkage of an aqueous hydraulic cementitious system during setting and early hardening comprising selecting a dry adsorbent-like porous particulate solid material from the group consisting of activated alumina, activated bauxite, activated carbon, activated silica gel, alumino-silicate, bone char, magnesia, and magnesium silicate, having a volume of entrapped gas within its pores and capable of preferentially adsorbing water and discharging the entrapped gas, incorporating the particulate solid material in the cementitious system at a time no later than the addition of water thereto, and discharging the entrapped gas during setting and early hardening of the cementitious system while in contact with the water to counteract the shrinkage tendency of the cementitious system.
Claim 18
Dependent Claim
54 words
A method according to claim 6 further including the step of selecting the size, surface properties and type of adsorbent-like porous particulate solid material so as to predetermine the speed of gas release and gas volume that will occur during setting and early hardening of the Cementitious system and thus controlling the gas discharge.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |