Additive for hydraulically setting compositions

Patent metadata

Field	Value
Publication number	US-11377392-B2
Application number	US-201615735829-A
Country	US
Kind code	B2
Filing date	Jun 27, 2016
Priority date	Jun 26, 2015
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

The present invention relates to an additive for hydraulically setting compositions comprising a colloidally disperse preparation comprising at least one salt of a polyvalent metal cation with at least one organic phosphonate and/or phosphate compound as anion and at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains. The additive is especially suitable as slump retainer and for improving early strength.

First claim

The invention claimed is:

1. An additive for hydraulically setting compositions, comprising an aqueous colloidally disperse preparation comprising
a) at least one salt of at least one polyvalent metal cation with at least one organic phosphonate and/or organic phosphate compound as anion, optionally in a mixture with at least one compound capable of releasing an inorganic anion selected from carbonate, oxalate, silicate, phosphate, polyphosphate, phosphite, borate, aluminate and sulphate, which forms a sparingly soluble salt with the polyvalent metal cation and
b) at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains,
wherein the polyvalent metal cation selected from Al 3+ , Fe 3+ , Fe 2+ , Zn 2+ , Mn 2+ , Cu 2+ , Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ and mixtures thereof, and wherein the metal cation is present in an amount corresponding to the following formula (a):

0.1
<

∑
i

⁢

z

K
,
i

*

n

K
,
i

∑
j

⁢

z

S
,
j

*

n

S
,
j

<
50.

(
a
)

where
z K,i is the magnitude of the charge of the polyvalent metal cation,
n K,i is the number of moles of the polyvalent metal cation,
z S,j is the magnitude of the charge of the anionic and anionogenic group present in the polymeric dispersant,
n S,j is the number of moles of the anionic and anionogenic group present in the polymeric dispersant,
the indices i and j are independent of one another and are an integer greater than 0, where i is the number of different kinds of polyvalent metal cations and j is the number of different kinds of anionic and anionogenic groups present in the polymeric dispersant.

2. The additive according to claim 1 , wherein the organic phosphonate or organic phosphate compound is capable of forming a sparingly soluble salt with at least one of the polyvalent metal cations.

3. The additive according to claim 1 , wherein at least one polyvalent metal cation and at least one anion are present in an amount which is calculated by the following formulae:

0.1
<

∑
i

⁢

z

K
,
i

*

n

K
,
i

∑
j

⁢

z

S
,
j

*

n

S
,
j

<
50

(
a
)

0
<

∑
l

⁢

z

A
,
l

*

n

A
,
l

∑
l

⁢

z

K
,
i

*

n

K
,
i

<
3

(
b
)

Assignees

• Construction Research & Technology Gmbh

Inventors

• Gädt Torben
• Grassl Harald
• Nicoleau Luc
• Smeets Alfons

Classifications

• C04B2103/14

  Hardening accelerators · CPC title

• C04B40/0042

  Powdery mixtures · CPC title

• C04B40/00

  Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability (active ingredients C04B22/00 - C04B24/00; hardening of a well-defined composition C04B26/00 - C04B28/00; making porous, cellular or lightening C04B38/00; mechanical aspects B28, e.g. conditioning the materials prior to shaping B28B17/02) · CPC title

• C04B28/08

  Slag cements · CPC title

• C04B28/026

  Oil shale cements · CPC title