Concrete-forming composition

Patent metadata

Field	Value
Publication number	US-12110254-B2
Application number	US-202017298709-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Feb 28, 2019
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

A concrete-forming composition for producing a concrete article including: (a) at least one internal curing agent including a water-insoluble crosslinked cellulose ether wherein the water-insoluble crosslinked cellulose ether has a higher water adsorption capacity compared to typically used superabsorbent polymers and wherein the water-insoluble crosslinked cellulose ether can be successfully and efficiently used as a water-insoluble crosslinked cellulose either internal curing agent in concrete-forming compositions; and (b) a cementitious material; a process for making the above concrete-forming composition; and a concrete article made from the above concrete-forming composition with the objective of reducing autogenous shrinkage and crack formation in the resulting concrete article made from the above concrete-forming composition.

First claim

What is claimed is:

1. A concrete-forming composition for producing a concrete article comprising:
(a) at least one internal curing agent including a water-insoluble crosslinked cellulose ether wherein the water-insoluble crosslinked cellulose ether has a water adsorption capacity of greater than or equal to 10 g/g as measured by the tea bag test method and a 1% aqueous viscosity of from 2 to 2,000 mPa·s and wherein the water-insoluble crosslinked cellulose ether can be successfully and efficiently used as a water-insoluble crosslinked cellulose ether internal curing agent in concrete formulations with an objective of reducing autogenous shrinkage and crack formation in the concrete; and
(b) a cementitious material.

2. The composition of claim 1 , wherein the at least one water-insoluble crosslinked cellulose ether internal curing agent comprises the reaction product of:
(a) at least one cellulose ether selected from the group consisting of hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, hydroxyethyl cellulose and mixtures thereof; and
(b) at least one crosslinker selected from the group consisting of 1,2-dichloroethane, 1.3-dichloropropane, dichlorodiethyl ether, diglycidyl ether, glycidyl methacrylate, epichlorohydrin, epibromohydrin, and mixtures thereof.

3. The composition of claim 1 , wherein the cementitious material is Portland cement.

4. The composition of claim 1 , wherein the concentration of the water-insoluble crosslinked cellulose ether internal curing agent is from 0.1 weight percent to 5 weight percent based on the weight of total compounds in the composition.

5. The composition of claim 1 , wherein the concentration of the cementitious material is from 5 weight percent to 50 weight percent based on the weight of total compounds in the composition.

6. A concrete article comprising a dried fully reacted concrete-forming composition of claim 1 .

7. A process for making a concrete-forming composition comprising admixing:
(a) at least one internal curing agent including a water-insoluble crosslinked cellulose ether wherein the water-insoluble crosslinked cellulose ether has a water adsorption capacity of greater than or equal to 10 g/g as measured by the tea bag test method and a 1% aqueous viscosity of from 2 to 2,000 mPa·s and wherein the water-insoluble crosslinked cellulose ether can be successfully and efficiently used as a water-insoluble crosslinked cellulose ether internal curing agent in concrete formulations with an objective of reducing autogenous shrinkage and crack formation in the concrete; and
(b) a cementitious material.

8. A process for making a concrete article comprising:
(I) mixing:
(a) at least one internal curing agent including a water-insoluble crosslinked cellulose ether wherein the water-insoluble crosslinked cellulose ether has a water adsorption capacity of greater than or equal to 10 g/g as measured by the tea bag test method and a 1% aqueous viscosity of from 2 to 2,000 mPa·s and wherein the water-insoluble crosslinked cellulose ether can be successfully and efficiently used as a water-insoluble crosslinked cellulose ether internal curing agent in concrete formulations with an objective of reducing autogenous shrinkage and crack formation in the concrete; and
(b) a cementitious material; wherein a concrete-forming composition is formed; and

(II) drying the concrete-forming composition of (I).

Assignees

• Dow Global Technologies Llc

Inventors

• Baumann Robert
• Breckwoldt Jörn
• Hild Alexandra
• Schmitz Marc

Classifications

• C04B2111/343

  Crack resistant materials · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B40/0675

  Mortars activated by rain, percolating or sucked-up water; Self-healing mortars or concrete · CPC title

• C04B24/386

  containing polyether side chains · CPC title

• C04B24/383 Primary

  Cellulose or derivatives thereof · CPC title