Hydraulic binder composition
The present invention relates to a hydraulic binder composition comprising: at least one Portland cement; at least one amorphous calcium aluminate; calcium sulfate; at least one alkaline salt S chosen from K 2 CO 3 , Rb 2 CO 3 , Cs 2 CO 3 and mixtures thereof; the composition being characterized in that the mass ratio of alkaline salt(s) S to amorphous calcium aluminate(s) ranges from 0.01 to 0.2.
1 . A dry mortar or concrete composition comprising:
a hydraulic binder composition comprising:
at least one Portland cement;
at least one amorphous calcium aluminate, the at least one amorphous calcium aluminate comprising at least 60% of amorphous phase;
calcium sulfate;
at least one alkali metal salt selected from the group consisting of K 2 CO 3 , Rb 2 CO 3 , Cs 2 CO 3 and mixtures thereof; wherein a weight ratio of the at least one alkali metal salt:the at least one amorphous calcium aluminate ranges from 0.01 to 0.2, and a total weight content of the at least one alkali metal salt in the dry mortar or concrete composition ranges from 0.05% to 0.30% by weight relative to a total weight of the dry mortar or concrete composition;
at least one aggregate; and
one or more polymers chosen from copolymers of vinyl acetate, copolymers of vinyl versatates, copolymers of ethylene, polyvinyl alcohols, styrene/butadiene aqueous dispersions, styrene/acrylic aqueous dispersions, styrene/acrylate aqueous dispersions, acrylic aqueous dispersions and vinyl acetate aqueous dispersions.
2 . The dry mortar or concrete composition as claimed in claim 1 , comprising:
from 15% to 80% by weight of the hydraulic binder composition as defined in claim 1 ;
from 15% to 80% by weight of the at least one aggregate;
from 0% to 5% by weight of additive(s); and
up to 10% by weight of the one or more polymer;
wherein percentages by weight being relative to a total weight of the dry mortar or concrete composition.
3 . The dry mortar or concrete composition as claimed in claim 2 , wherein the additives are selected from the group consisting of setting accelerators, setting retarders, antifoaming agents, water repellents, antiaging agents, rheological agents, and mixtures thereof.
4 . The dry mortar or concrete composition as claimed in claim 1 , wherein the at least one aggregates is selected from the group consisting of gravel, chippings, sand, calcium carbonate, dolomite, recycled glass, and mixtures thereof.
5 . The dry mortar or concrete composition as claimed in claim 1 , wherein the at least one alkali metal salt:the at least one amorphous calcium aluminate(s) weight ratio ranges from 0.02 to 0.06.
6 . The dry mortar or concrete composition as claimed in claim 1 , wherein a weight content of the at least one alkali metal salt in the hydraulic binder composition ranges from 0.1% to 0.8% by weight, relative to a total weight of the hydraulic binder composition.
7 . The dry mortar or concrete composition as claimed in claim 1 , wherein the at least one alkali metal salt is K 2 CO 3 .
8 . The dry mortar or concrete composition as claimed in claim 1 , wherein the calcium sulfate is chosen from anhydrous calcium sulfate (or anhydrite) (generally denoted anhydrous CaSO 4 ), calcium sulfate dihydrate (or gypsum) (CaSO 4 ·2H 2 O), calcium sulfate semihydrate (hemihydrate or bassanite), and mixtures thereof.
9 . The dry mortar or concrete composition as claimed in claim 1 , wherein a weight content of the calcium sulfate in the hydraulic binder composition ranges from 1% to 30% by weight relative to a total weight of the hydraulic binder composition.
10 . The dry mortar or concrete composition as claimed in claim 1 , wherein the at least one Portland cement is selected from the group consisting of CEM I Portland cements, CEM II Portland cements, CEM III Portland cements, CEM IV Portland cements, CEM V Portland cements, and mixtures thereof.
11 . The dry mortar or concrete composition as claimed in claim 1 , wherein the at least one Portland cement comprises a CEM I 52.5 N Portland cement, a CEM I 52.5 R Portland cement, a CEM I 42.5 R Portland cement or a CEM I 42.5 N Portland cement.
12 . The dry mortar or concrete composition as claimed in claim 1 , wherein a total content of the at least one Portland cement varies from 10% to 80% by weight relative to a total weight of the hydraulic binder composition.
13 . A wet mortar or wet concrete composition comprising:
a dry mortar or concrete composition comprising
a hydraulic binder composition comprising:
at least one Portland cement;
at least one amorphous calcium aluminate, the at least one amorphous calcium aluminate comprising at least 60% of amorphous phase;
calcium sulfate;
at least one alkali metal salt selected from the group consisting of K 2 CO 3 , Rb 2 CO 3 , Cs 2 CO 3 and mixtures thereof; wherein a weight ratio of the at least one alkali metal salt:the at least one amorphous calcium aluminate ranges from 0.01 to 0.2, and a total weight content of the at least one alkali metal salt in the dry mortar or concrete composition ranges from 0.05% to 0.30% by weight relative to a total weight of the dry mortar or concrete composition;
at least one aggregate; and
one or more polymers chosen from copolymers of vinyl acetate, copolymers of vinyl versatates, copolymers of ethylene, polyvinyl alcohols, styrene/butadiene aqueous dispersions, styrene/acrylic aqueous dispersions, styrene/acrylate aqueous dispersions, acrylic aqueous dispersions and vinyl acetate aqueous dispersions; and
water.