Dry mixes and cements comprising cellulose ethers having polyether groups as lubricative additives for roller compacted concrete applications and methods of using them

Patent metadata

Field	Value
Publication number	US-2024279118-A1
Application number	US-202218568999-A
Country	US
Kind code	A1
Filing date	Jul 27, 2022
Priority date	Aug 3, 2021
Publication date	Aug 22, 2024
Grant date	—

Abstract

The present invention provides a dry mix composition of a powder of an ultra high-viscosity cellulose ether having one or more polyether groups, the cellulose ether having a 1 wt. % aqueous solution viscosity (20 C, 2.55 s −1 shear rate as determined using a controlled rate rotational rheometer) ranging from 10,000 to 100,000 mPa·s, or, preferably, 11,000 to 16,000 mPa·s, a graded aggregate, and a hydraulic cement, or a wet granular mix of the cement, graded aggregate and an admixture therefor including the cellulose ether. When combined with water to form a wet granular hydraulic cement composition, the composition of the present invention behaves like asphalt compositions and has zero or near zero slump, a high lubricity and 13.6 wt. % or less of water, or, preferably, from 5 to 11 wt. % of water, based on the total weight of the dry mix composition. The cellulose ether enables lubricity without impairing compaction and without causing air entrainment.

First claim

We claim:

1 . A dry mix composition comprising:
(a) hydraulic cement in the amount of from 10 to 23 wt. %, based on the total weight of the dry mix composition, (b) graded aggregate in the amount of from 70 to 89.95 wt. %, based on the total weight of the dry mix composition, comprising i) one or more coarse aggregates having a sieve particle size of from 300 μm to 20 mm, and ii) one or more fine aggregates having a sieve particle size of from 70 μm to less than 300 μm, wherein a weight ratio of the i) total coarse aggregates to the ii) total fine aggregates in the graded aggregate ranges from 4:1 to 0.9:1, (c) from 0.01 to 1.0 wt. %, based on the total weight of the dry mix composition, of a powder of one or more cellulose ethers having one or more polyether groups and having an aqueous solution viscosity at 1 wt. % cellulose ether solids, at 20° C., and a 2.55 s −1 shear rate ranging from 10,000 to 100,000 mPa·s, as determined using a controlled rate rotational rheometer, wherein the aqueous solution was made by drying the cellulose ether powder overnight in a 70° C. vacuum oven, dispersing the powder into hot water at 70° C., allowing it to dissolve with stirring as it cools to room temperature and refrigerating it overnight at 4° C. to form the aqueous solution, wherein, all wt. % s add to 100%.

2 . The dry mix composition as claimed in claim 1 , wherein the (a) hydraulic cement is chosen from an ordinary Portland cement, an aluminate cement, a pozzolan, or their mixtures.

3 . The dry mix composition as claimed in claim 1 , wherein in the (b) graded aggregate, a ratio of the sieve particle size of the total i) coarse aggregate to the sieve particle size of the ii) fine aggregate ranges from 10:1 to 2:1.

4 . The dry mix composition as claimed in claim 3 , wherein the (b) graded aggregate comprises as the i) coarse aggregate a mixture of a i)A) first coarse aggregate having a sieve particle size of from 300 μm to 2000 μm and a i)B) second coarse aggregate having a sieve particle size of from 2000 μm to 20 mm,
further wherein the ratio of the sieve particle size of the i)B) second coarse aggregate to the sieve particle size of the i)A) first coarse aggregate ranges from 15:1 to 1.5:1.

5 . The dry mix composition as claimed in claim 1 , wherein each polyether group in at least one of the cellulose ethers in the (c) powder of the one or more cellulose ethers having one or more polyether groups, independently, has from 4 to 50 ether or oxyalkylene groups.

6 . The dry mix composition as claimed in claim 1 , wherein at least one of the cellulose ethers in the (c) powder of the one or more cellulose ethers having one or more polyether groups has a polyether degree of substitution of from 0.0005 to 0.01 eq, as determined by the number of molar equivalents of polyether containing reactants per mole of anhydroglucose units (AGU) in the cellulose or cellulose ether used to make the cellulose ether having one or more polyether groups.

7 . The dry mix composition as claimed in claim 1 , wherein at least one of the cellulose ethers in the (c) powder of the one or more cellulose ethers having one or more polyether groups further has a side chain chosen from hydroxyethyl, hydroxypropyl, methyl, and combinations thereof.

8 . The dry mix composition as claimed in claim 7 , wherein at least one of the cellulose ethers in the (c) powder of the one or more cellulose ethers having one or more polyether groups is a hydroxyethyl methyl cellulose ether having a hydroxyethyl degree of substitution (MS) ranging from 0 and 0.4, and a methoxyl degree of substitution (DS) of from 1.2 to 1.8, or is a hydroxyethyl cellulose having a hydroxyethyl degree of substitution (MS) of from 1.4 to 2.4.

9 . The dry mix composition as claimed in claim 1 , further comprising (d) one or more superplasticizers.

10 . The dry mix composition as claimed in claim 1 , wherein the dry mix composition provides when further comprising water in the amount of from 5 to 13.6 wt. %, based on the total weight of the dry mix composition, a granular wet mix composition which has a slump of 6 mm or less, as determined in accordance with ASTM C143 (2010) using a stainless steel cone height 80 mm, top diameter 40 mm, bottom diameter 90 mm, and a steel rod stirrer 9.5 mm diameter, 266.7 mm length by mixing the dry mix compositions in a plastic bag, adding the powder to the indicated amount of water in a Hobart mixing bowl, mixing twice on speed 1 for 15 s and stopping after mixing each time to scrape the sides of the bowl, slaking the mixture for 10 minutes and pouring the mixture in three equal layers into the stainless-steel cone which has been dampened with water via a sponge and placed on a non-absorbent surface, filling each of the three layers and mixing with the stainless steel rod in a circular motion, positioning the rod parallel to the sides of the cone and working to a vertical position to finish in the center, finishing the surface of the wet cement composition flush with the top of the cone, pulling the cone up and off of the wet cement composition and recording the slump within 30 seconds by measuring the total height of the cone and reporting the difference in the measured height and 80 mm.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Fan Yi
• Radler Michael J
• Theuerkauf Jorg
• Levin Jessica R
• Sammler Robert L

Classifications

• C04B2103/32

  Superplasticisers · CPC title

• C04B40/0042

  Powdery mixtures · CPC title

• C04B28/04

  Portland cements · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B2111/0075

  for road construction · CPC title