Self-desiccating, dimensionally-stable hydraulic cement compositions with enhanced workability

Patent metadata

Field	Value
Publication number	US-10112870-B2
Application number	US-201715825366-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Dec 12, 2016
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Cementitious binder compositions for cementitious products including a hydraulic cement-based reactive powder blend, an inorganic flow control agent, and a metal-based dimensional movement stabilizing agent including at least one member of the group of lithium salt and lithium base, and methods for making the cementitious binder compositions.

First claim

What is claimed is:

1. A cementitious composition comprising a reaction product of a mixture of:
a hydraulic cement-based reactive powder comprising:
an aluminate cement selected from at least one member of the group consisting of calcium aluminate cement and calcium sulfoaluminate cement in an amount of 30-75 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder,
Portland cement in an amount of 5-35 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder, and
a calcium sulfate selected from the group consisting of calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and mixtures thereof, the calcium sulfate in an amount of 20-40 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder;

an inorganic flow control agent in a weight ratio of inorganic flow control agent to hydraulic cement-based reactive powder of 0.5:1 to 2.0:1, wherein the inorganic flow control comprises at least one member selected from the group consisting of fly ash and calcium carbonate and wherein average particle size of the calcium carbonate ranges from about 10 to 150 microns;
a metal-based dimensional movement stabilizing agent in an amount equal to 1.0 to 4.0 weight percent of the hydraulic cement-based reactive powder, wherein the metal-based dimensional movement stabilizing agent comprises a lithium compound selected from at least one member of the group of lithium salt and lithium base, wherein the lithium salt is at least one member of the group of lithium carbonate, lithium sulfate, lithium nitrate, lithium nitrite, and lithium silicate, wherein the base is lithium hydroxide;
a filler in a weight ratio of filler to hydraulic cement-based reactive powder of 0.5:1 to 3.5:1; and
water in a weight ratio of water to hydraulic cement-based reactive powder of 0.6:1 to 1.3:1.

2. The composition of claim 1 ,
wherein the hydraulic cement-based reactive powder comprises:
30-70 parts by weight aluminate cement per 100 parts by weight of the hydraulic cement-based reactive powder;
7.5-25 parts by weight Portland cement per 100 parts by weight of the hydraulic cement-based reactive powder;
25 to 35 parts by weight calcium sulfate per 100 parts by weight of the hydraulic cement-based reactive powder;
wherein
the weight ratio of the inorganic flow control agent to hydraulic cement-based reactive powder equals 0.75:1 to 1.5:1;
the amount of the metal-based dimensional movement stabilizing agent equals 1.5 to 3.5 weight percent of the hydraulic cement-based reactive powder;
the weight ratio of filler to hydraulic cement-based reactive powder equals 1.0:1 to 2.5:1; and
the weight ratio of water to hydraulic cement-based reactive powder is 0.7:1 to 1.2:1.

3. The composition of claim 1 , further comprising:
an organic rheology modifier in an amount equal to 0.02 to 1 wt. % of the hydraulic cement-based reactive powder;
an inorganic viscosity enhancing agent in an amount equal to 0 to 1 wt. % of the hydraulic cement-based reactive powder;
a superplasticizer in an amount equal to 0.3 to 3.5 wt. % of the hydraulic cement-based reactive powder;
a defoamer in an amount equal to 0 to 2.0 wt. % of the hydraulic cement-based reactive powder;
a set retarding agent in an amount equal to 0 to 2.0 wt. % of the hydraulic cement-based reactive powder;
a color pigment in an amount equal to 0 to 8.0 wt. % of the hydraulic cement-based reactive powder;
an air entraining agent in an amount equal to 0 to 1.0 wt. % of the hydraulic cement-based reactive powder;
an organic film forming polymer in an amount equal to 0 to 15.0 wt. % of the hydraulic cement-based reactive powder; and
a pozzolan other than fly ash in a weight ratio of pozzolan to hydraulic cement-based reactive powder of 0 to 1.

4. The composition of claim 2 , further comprising:
an organic rheology modifier in an amount equal to 0.06 to 0.50 wt. % of the hydraulic cement-based reactive powder;
an inorganic viscosity enhancing agent in an amount equal to 0 to 0.50 wt. % of the hydraulic cement-based reactive powder;
a superplasticizer in an amount equal to 0.50 to 1.50 wt. % of the hydraulic cement-based reactive powder;
a defoamer in an amount equal to 0.50 to 1.00 wt. % of the hydraulic cement-based reactive powder;
a set retarding agent in an amount equal to 0.20 to 1.00 wt. % of the hydraulic cement-based reactive powder;
a color pigment in an amount equal to 0 to 4.00 wt. % of the hydraulic cement-based reactive powder;
an air entraining agent in an amount equal to 0 to 0.25 wt. % of the hydraulic cement-based reactive powder;
an organic film forming polymer in an amount equal to 0 to 5.00 wt. % of the hydraulic cement-based reactive powder; and
a pozzolan other than fly ash in a weight ratio of pozzolan other than fly ash to hydraulic cement-based reactive powder of 0:1 to 1:1.

5. The composition of claim 1 , further comprising at least one retarder selected from the group consisting of citric acid and sodium gluconate.

6. The composition of claim 1 , wherein the inorganic flow control agent is fly ash in the absence of calcium carbonate.

7. The composition of claim 1 , wherein the mixture has an absence of alkali metal hydroxide.

8. The composition of claim 1 , wherein the mixture has an absence of glass.

9. A method comprising:
making a mixture by mixing the composition of claim 1 comprising:
the hydraulic cement-based reactive powder comprising:
the aluminate cement,
the Portland cement, and
the calcium sulfate;

the inorganic flow control agent;
the metal-based dimensional movement stabilizing agent;
the filler; and
the water;
reacting the mixture; and
allowing the mixture to set.

10. The method of claim 9 , wherein the mixture has an absence of alkali metal hydroxide and has an absence of alkali metal salt other than lithium carbonate.

11. A cementitious composition comprising a reaction product of a mixture of:
a hydraulic cement-based reactive powder comprising:
an aluminate cement selected from at least one member of the group consisting of calcium aluminate cement and calcium sulfoaluminate cement in an amount of 25-80 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder,
Portland cement in an amount of 2.5-45 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder, and
a calcium sulfate selected from the group consisting of calcium sulfate dihydrate, calcium sulfate hemihydrate, anhydrous calcium sulfate and mixtures thereof, the calcium sulfate in an amount of 15-45 parts by weight per 100 parts by weight of the hydraulic cement-based reactive powder;

an inorganic flow control agent in a weight ratio of inorganic flow control agent to hydraulic cement-based reactive powder of 0.25:1 to 3.0:1, wherein the inorganic flow control comprises at least one member selected from the group consisting of fly ash and calcium carbonate and wherein average particle size of the calcium carbonate ranges from about 10 to 150 microns;
a metal-based dimensional movement stabilizing agent in an amount equal to 0 to 5.0 weight percent of the hydraulic cement-based reactive powder, wherein the metal-based dimensional movement stabilizing agent comprises a lithium compound selected from at least one member of the group of lithium salt and lithium base, wherein the lithium salt is at least one member of the group of lithium carbonate, lithium sulfate, lithium nitrate, lithium nitrite, and lithium silicate, wherein the base is lithium hydroxide;
a filler in a weight ratio of filler to hydraulic cement-based reactive powder of 0:1 to 5.0:1; and

Assignees

• United States Gypsum Co

Inventors

• White Paul
• Dubey Ashish

Classifications

• C04B2111/00637

  as glue or binder for uniting building or structural materials · CPC title

• C04B2111/60

  Flooring materials · CPC title

• C04B2111/00612

  as one or more layers of a layered structure · CPC title

• C04B2103/54

  Pigments; Dyes · CPC title

• C04B2111/34

  Non-shrinking or non-cracking materials · CPC title