US 5,489,334 AGranted

Process for producing a hydraulic cement binder for both general and special applications

OwnerWilliam D. Kirkpatrick, Carole W. Kirkpatrickinventors

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Abstract

A process is disclosed for producing a hydraulic cement binder for both general and special applications, consisting of water, cementitious materials, boric acid, borax, citric acid, an alkali metal activator, and with or without ground silica. This cement making process with sequences for mixing the composition, is particularly useful because it provides: time to mix all components adequately, unrestricted transporting time that can be terminated, at will, followed by alterable placement and finishing times. The process provides the means for creating a hydraulic cement binder that can be used as a neat cement or it can be extended with fillers, such as sand and gravel, to make mortar or concrete, that rapidly gains very high structural strengths.

Claims18

Dependent claims

A cement making process which comprises, (1) mixing:

from about 14.52 to 21.77 percent water,
from about 0.07 to 1.25 percent boric acid set-suspending agent,
from about 0.15 to 2.80 percent borax set-suspending agent,
from about 0 to 8.00 percent ground silica, together with two or more hydraulic cementitious components selected from the group consisting of subbituminous class C fly ash, portland cement, and slag;
with the total of said hydraulic cementitious components containing from about 77.00 percent to about 95.00 percent subbituminous class C fly ash;
whereby the components in step 1 provide the means to:
a. suspend the set of the hydraulic cementitious components,
b. temper the hydraulic cementitious components, during the period of set-suspension, thereby creating an inorganic reactant,
(2) activating at the time of placement said inorganic reactant by mixing with:
from about 0.04 to 2.83 percent citric acid accelerator, and
from about 0.04 to 11.00 percent alkali metal activator, selected from the group consisting of:
potassium hydroxide, potassium carbonate, sodium hydroxide, and sodium carbonate, lithium hydroxide, and lithium carbonate;
and whereby the components in step 2 provide the means to:
a. terminate the set-suspension of the cementitious components,
b. create 3 different periods of time for placement following activation, by changing the order of introduction of components (2).

12 more elements

A cement making process which comprises, (1) mixing:

from about 14.52 to 21.77 percent water,
from about 0.15 to 2.80 percent borax set-suspending agent,
from about 0 to 8.00 percent ground silica, together with two or more hydraulic cementitious components selected from the group consisting of subbituminous class C fly ash, portland cement, and slag;
with the total of said hydraulic cementitious components containing from about 77.00 percent to about 95.00 percent subbituminous class C fly ash;
and whereby the components in (1) provide the means to:
a. suspend the set of the hydraulic cementitious components,
b. temper the hydraulic cementitious components, during the period of set-suspension, thereby creating an inorganic reactant,
(2) activating at the time of placement said inorganic reactant by mixing with:
from about 0.07 to 1.25 percent boric acid modifying retarder,
from about 0.04 to 2.83 percent citric acid accelerator,
from about 0.04 to 11.00 percent alkali metal activator, selected from the group consisting of:
potassium hydroxide, potassium carbonate, sodium hydroxide, and sodium carbonate, lithium hydroxide, and lithium carbonate;
and whereby the components in (2) provide the means to:
a. terminate the set-suspension of the cementitious components,
b. create 3 different periods of time for placement following activation, by changing the order of introduction of components in (2).

12 more elements

A cement making process which comprises, (1) mixing:

from about 14.52 to 21.77 percent water,
from about 0.10 to 1.35 percent boric acid suspending agent,
from about 0 to 7.99 percent ground silica, together with two or more hydraulic cementitious components selected from the group consisting of subbituminous class C fly ash, portland cement, and slag;
with the total of said hydraulic cementitious components containing from about 77.03 percent to about 95.00 percent subbituminous class C fly ash;
and whereby the components in (1) provide the means to:
a. suspend the set of the said hydraulic cementitious components,
b. temper the hydraulic cementitious components, during the period of set-suspension, thereby creating an inorganic reactant,
(2) activating at the time of placement said inorganic reactant by mixing with:
from about 0.04 to 2.83 percent citric acid accelerator, and
from about 0.04 to 11.03 percent alkali metal activator, selected from the group consisting of:
potassium hydroxide, potassium carbonate, sodium hydroxide, sodium hydroxide, lithium hydroxide, and lithium carbonate;
and whereby the components in (2) provide the means to:
a. terminate the set-suspension of the cementitious components,
b. create 3 different periods of time for placement following activation, by changing the order of introduction of components in (2), wherein:
(i) the ponderable placement time is created by introducing the components in (2) into solution simultaneously,
(ii) the shortest placement time is created by introducing the components in (2) separately with said citric acid accelerator being the last component entered into solution, and
(iii) the longest placement time is created by introducing the components in (2) separately with said alkali metal activator being the last component entered into solution.

14 more elements

A cement making process which comprises, (1) mixing:

from about 14.52 to 21.77 percent water, from about 0.20 to 2.95 percent borax set-suspending agent,
from about 0 to 7.98 percent ground silica, together with two or more hydraulic cementitious components selected from the group consisting of subbituminous class C fly ash, portland cement, and slag;
with the total of said hydraulic cementitious components containing from about 77.03 percent to about 95.00 percent subbituminous class C fly ash;
and whereby the components in (1) provide the means to:
a. suspend the set of the said hydraulic cementitious components,
b. temper the hydraulic cementitious components, during the period of set-suspension, thereby creating an inorganic reactant, and
(2) activating at the time of placement said inorganic reactant by mixing with:
from about 0.04 to 2.85 percent citric acid accelerator, and
from about 0.04 to 11.05 percent alkali metal activator, selected from the group consisting of:
potassium hydroxide, potassium carbonate, sodium hydroxide, sodium carbonate, lithium hydroxide, and lithium carbonate;
and whereby the components in (2) provide the means to:
a. terminate the set-suspension of the cementitious components,
b. create 3 different periods of time for placement following activation, by changing the order of introduction of components in (2), wherein:
(i) the ponderable placement time is created by introducing the components in (2) into solution simultaneously,
(ii) the shortest placement time is created by introducing the components in (2) separately with said alkali metal activator being the last component entered into solution, and
(iii) the longest placement time is created by introducing the components in (2) separately with said citric acid accelerator being the last component entered into solution.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/375,823Filed 20 Jan 1995 · continuation in part
Priority: 27 May 1993
Granted: 6 Feb 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

C04B 28/08
Containing hydraulic cements other than calcium sulfates: slag cements
C04B 28/021
Containing hydraulic cements other than calcium sulfates: ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g.…
C04B 28/04
Containing hydraulic cements other than calcium sulfates: portland cements
C04B 40/065
Mechanical separation of ingredients, e.g. accelerator in breakable microcapsules: two or more component mortars

Family

Serial66,702Parent of this continuation-in-part · filed 27 May 1993
Serial267,590Parent of this continuation-in-part · filed 29 Jun 1994
US 5,374,308 AParent of this continuation-in-part
US 5,387,283 AParent of this continuation-in-part
US 5,489,334 AThis patent

From the US filing history. Foreign family members aren’t listed.