Cementitious compositions and related systems and methods
AssigneeReco Cement Products, LLC
InventorsDavid A. Lisowski, John R. Miglautsch
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Abstract
Provided are cementitious compositions and related systems and methods. The cementitious compositions, or admixtures, according to the present invention generally comprise gypsum, a first alkaline component and glass. The admixture may further comprise fly ash, which is preferably obtained as a waste by-product from a coal-burning power plant. A method according to the present invention comprises an initial step of analyzing or receiving an analysis of a fly ash sample. Based at least in part on the analysis of the fly ash sample, a mix rate may be selected and an initial admixture can be formulated, which, when added to the fly ash sample, creates an alternative or additive to Portland cement for use in concrete, for example.
Claims13
A method of forming a cementitious composition, the method comprising the steps of:
- determining an ash weight of a fly ash sample;
- selecting a mix strength of greater than or equal to 0.15 and less than or equal to 0.50;
- calculating an ash rate by subtracting the mix rate from 1.00;
- calculating a first intermediate factor by dividing the mix rate by the ash rate;
- calculating an admixture total weight by dividing the ash weight by the ash rate;
- calculating a mix weight by multiplying the total weight by the mix rate;
- calculating a rate adjustment factor by dividing a first ash factor less than one by the sum of one plus the intermediate factor;
- calculating a mix factor by subtracting the rate adjustment factor from the mix rate;
- and
- based on the mix factor, selecting a first weight of gypsum, a second weight of a first alkaline component and a third weight of glass, wherein the sum of the first weight, the second weight, and the third weight equals the mix weight.
A method comprising the steps of:
- forming a first mixture by placing a first weight of fly ash, a second weight of gypsum, a third weight of a first alkaline component, and a fourth weight of glass in a mixer;
- and
- mixing the first mixture in the mixer to form an admixture.
A method comprising the steps of:
- forming a cementitious admixture comprising:
- greater than zero and less than about thirty-three percent by weight gypsum;
- greater than zero and less than about thirty-three percent by weight a first alkaline component comprising calcium oxide;
- greater than zero and less than about thirty-three percent by weight glass;
- greater than about forty-five and less than about seventy-five percent by weight fly ash;
- and
- up to about four percent by weight set retarder;
- forming a first mortar mixture consisting essentially of:
- a first cement weight of ordinary Portland cement;
- a first weight of water;
- and
- a first weight of sand;
- determining a first compressive strength of the first mortar mixture;
- forming a second mortar mixture consisting essentially of:
- a second cement weight of the cementitious admixture;
- a second weight of water approximately the same as the first weight of water;
- and
- a second weight of sand approximately the same as the first weight of sand;
- and
- determining a second compressive strength of the second mortar mixture;
- if the second compressive strength is greater than ninety percent of the first compressive strength, dividing the first cement weight by the second cement weight to calculate a carbon impact number.
Dependencies are inferred from the claim text.