Hydraulic binder based on ground granulated blast furnace slag having improved setting improved curing

Patent metadata

Field	Value
Publication number	US-9656918-B2
Application number	US-201514928480-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Oct 30, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

Disclosed are a hydraulic binder composition containing at least 50% by weight of ground granulated blast furnace slag and a system for activating the slag, the system containing at least calcium sulphate, at least one product chosen from a source of Portland clinker and lime, at least one aluminum derivative and at least one alkali metal or alkaline earth metal salt; containing a ready-to-mix building material composition comprising such a hydraulic binder and aggregates of inert material capable of being agglomerated in the presence of an aqueous phase; and a process for employing the ready-to-mix composition containing a stage of mixing the said composition with water for the purpose of the preparation of a building material, such as a concrete or mortar, and in particular an adhesive mortar, pointing mortar or levelling mortar or coating.

First claim

The invention claimed is:

1. A hydraulic binder composition comprising each of a-e:
a) at least 50% by weight, with respect to the weight of the hydraulic binder composition, of a ground granulated blast furnace slag,
b) calcium sulphate,
c) at least one source of Portland clinker or lime,
d) at least one aluminium derivative that is an alumina having a BET specific surface ranging from 100 to 400 m 2 /g, a monocalcium aluminate or a calcium sulphoaluminate, and
e) at least one alkali metal or alkaline earth metal salt that is a chloride salt, bromide salt, silicate salt, nitrate salt or carboxylic acid salt,
the total content of calcium sulphate, expressed as SO 3 equivalent content, being at least 5% by weight, with respect to the weight of the hydraulic binder composition,
the sum of the contents of c) and e) being less than 10% by weight, with respect to the weight of the hydraulic binder composition.

2. The hydraulic binder composition according to claim 1 , wherein in the ground granulated blast furnace slag the amounts of calcium oxide, magnesia, alumina and silica satisfy at least one of the following three relationships:

r
⁢

⁢
1

=

(

CaO
+
MgO

)

(

Al
⁢

⁢
2
⁢
O
⁢

⁢
3

+

SiO
⁢

⁢
2

)

>
1.03

r
⁢

⁢
2
⁢

⁢

(

F
⁢

⁢
11

)

=

(

CaO
+
MgO
+

0.3
*
Al
⁢

⁢
2
⁢
O
⁢

⁢
3

)

(

SiO
⁢

⁢
2

+

0.7
*
Al
⁢

⁢
2
⁢
O
⁢

⁢
3

)

>
1.20

r
⁢

⁢
3
⁢

⁢

(

F
⁢

⁢
3

)

=

(

CaO
+
MgO
+

Al
⁢

⁢
2
⁢
O
⁢

⁢
3

)

(

SiO
⁢

⁢
2

)

≥
1.6

,

and the content of aluminium oxide (Al 2 O 3 ) being less than 13% by weight of the weight of ground granulated blast furnace slag,
r1, r2 and r3 corresponding to the ratios by weight relating to the amounts of calcium oxide, magnesia, alumina and silica present in the ground granulated blast furnace slag.

3. The hydraulic binder composition according to claim 1 , having a Blaine specific surface of the ground granulated blast furnace slag from 7000 to 8000 cm 2 /g.

4. The hydraulic binder composition according to claim 1 , having a maximum size of particles of the ground granulated blast furnace slag less than 45 μm.

5. The hydraulic binder composition according to claim 1 , comprises having a total content of ground granulated blast furnace slag(s) of 60 to 70% by weight, with respect to the weight of the hydraulic binder composi

Assignees

• Bostik Sa

Inventors

• Kuryatnyk Tetyana
• Becquet Jeremy

Classifications

• C04B2111/00517

  for masonry · CPC title

• C04B18/141

  Slags · CPC title

• C04B28/14

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title

• C04B2111/00215

  Mortar or concrete mixtures defined by their oxide composition · CPC title

• C04B40/065

  Two or more component mortars · CPC title