Concrete materials with modified rheology, methods of making, and uses thereof
A composition, in the form of a concrete, cement paste, mortar or intermediate thereof, comprising one or more cementitious binder materials present in an amount ranging from 0.5% to 75% by weight of the composition, attapulgite present in an amount ranging from 0.01% to 1.00% by weight of the composition, and optionally water. Although subject to many uses, in some embodiments, the composition is suitable for applications in need or desire of self-consolidating concretes (SCCs), precast concrete, shotcrete, and the like. Although makeable by multiple methods, in some embodiments, the composition is made by mixing the component ingredients. In some embodiments, the composition has one or more properties chosen from superior aggregate suspension, eliminated segregation, improved workability, improved flowability, improved pumpability—or improved overall performance—of concretes.
1. A composition, comprising:
one or more cementitious binder materials present in an amount ranging from 0.5% to 75% by dry weight of the composition; and
purified attapulgite substantially free of non-attapulgite minerals present in an amount ranging from 0.01% to 1.00% by dry weight of the composition.
2. The composition of claim 1 , wherein the composition further comprises water in an amount ranging from 0.2 to 0.7 W/C, wherein W is the mass of the water, and wherein C is the dry mass of the one or more cementitious binder materials.
3. The composition of claim 2 , wherein the amount W/C ranges from 0.35 to 0.60.
4. The composition of claim 1 , wherein the composition is in the form selected from the group consisting of concrete, cement paste, and mortar.
5. The composition of claim 1 , wherein the purified attapulgite substantially free of non-attapulgite minerals is present in an amount ranging from 0.02% to 0.7% by weight of the composition.
6. The composition of claim 1 , wherein the purified attapulgite substantially free of non-attapulgite minerals is present in an amount ranging from 0.03% to 0.15% by weight of the composition.
7. The composition of claim 1 , wherein the purified attapulgite substantially free of non-attapulgite minerals is present in an amount ranging from 0.075% to 0.20% by dry weight of the composition.
8. The composition of claim 5 , wherein the one or more cementitious binder materials are present in an amount ranging from 0.5% to 75% by weight of the composition.
9. The composition of claim 1 , wherein the one or more cementitious binder materials are selected from the group consisting of from Portland cements and lime.
10. The composition of claim 1 , further comprising one or more aggregates present in an amount ranging from 10% to 80% by weight of the dry components.
11. The composition of claim 1 , further comprising one or more admixtures present in an amount ranging from 0.02% to 4% by weight of cementitious material.
12. The composition of claim 1 , wherein the one or more cementitious binder materials further comprise one or more supplementary cementitious materials.
13. A method of making a composition, comprising
mixing (a) one or more cementitious materials; and
(b) purified attapulgite substantially free of non-attapulgite minerals;
to form a resultant composition;
wherein the (a) one or more cementitious binder materials present in an amount ranging from 0.5% to 75% by dry weight of the composition;
wherein the (b) the purified attapulgite substantially free of non-attapulgite minerals is present in an amount ranging from 0.01% to 1.00% by dry weight of the composition.
14. The method of claim 13 , further comprising mixing water in an amount ranging from 0.2 to 0.7 W/C, wherein W is the mass of the water, and wherein C is the dry mass of the one or more cementitious binder materials.
15. The method of claim 13 , wherein the composition is free from a setting agent.
16. A method of making a composition, comprising
(1) mixing (a) one or more cementitious materials; and
(b) purified attapulgite substantially free of non-attapulgite minerals; and
(c) water an amount ranging from 0.2 to 0.7 W/C, wherein W is the mass of the water, and wherein C is the dry mass of the one or more cementitious binder materials
to form a resultant composition; and
(2) spraying the resultant composition in a shotcrete process to make a structure;
wherein the (a) one or more cementitious binder materials present in an amount ranging from 0.5% to 75% by dry weight of the composition;
wherein the (b) purified attapulgite substantially free of non-attapulgite minerals present in an amount ranging from 0.01% to 1.00% by dry weight of the composition.
17. The method of claim 16 , wherein the shotcrete process is a wet-mix shotcrete process.
18. The method of claim 16 , wherein the shotcrete process is a dry-mix shotcrete process.
19. The method of claim 16 , further comprising building up 10 inches or more of shotcrete on a vertical surface.
20. The composition of claim 1 , further comprising silica fume in an amount less than 10% by weight of the cementitious binder materials.