LOW CARBON CONCRETE COMPOSITION AND A METHOD TO PRODUCE A LOW CARBON CONCRETE COMPOSITION
A concrete composition includes a hydraulic binder, wherein the hydraulic binder includes Portland clinker and mineral addition including limestone, or fly ash or combination thereof, the limestone and/or fly ash representing at least 50% by weight of the total weight of the binder; a cationic polymer having a cationic charge density greater than 0.5 meq/g, and an intrinsic viscosity less than 1 dl/g; a water-reducing additive comprising at least one phosphonic amino-alkylene group; aggregates, and water.
1 . A concrete composition comprising:
a hydraulic binder, wherein the hydraulic binder comprises Portland clinker and mineral addition selected from the group consisting of limestone, fly ash and combination thereof, the limestone and/or fly ash representing at least 50% by weight of the total weight of the binder;
a cationic polymer having a cationic charge density greater than 0.5 meq/g, and an intrinsic viscosity less than 1 dl/g;
a water-reducing additive comprising at least one phosphonic amino-alkylene group;
aggregates, and
water.
2 . The concrete composition according to claim 1 , wherein the limestone and/or fly ash represents at least 60% by weight of the total weight of the binder.
3 . The concrete composition according to claim 1 , wherein limestone is in the form of particles having a Dv90 less than or equal to 200 μm.
4 . The concrete composition according to claim 1 , wherein limestone is in the form of particles and is composed of:
a fraction of coarse particles having a D50 comprised between 10 and 30 μm, and
a fraction of fine particles having a D50 comprised between 1 and 6 μm.
5 . The concrete composition according to claim 1 , wherein fly ash is in the form of particles having a Dv50 comprised between 30 to 60 μm.
6 . The concrete composition according to claim 1 , wherein the hydraulic binder comprises up to 15% by weight, compared to the total weight of the binder of additional mineral component.
7 . The concrete composition according to claim 1 , wherein the water to binder ratio is comprised between 0.18 and 0.30.
8 . The concrete composition according to claim 1 , wherein the cationic polymer comprises cationic groups selected from the group comprising phosphonium group, pyridinium group, sulphonium group, quaternary amine group and combination thereof.
9 . The concrete composition according to claim 1 , wherein the cationic polymer is obtained by polycondensation of epichlorohydrin with a mono- or dialkylamine.
10 . The concrete composition according to claim 1 , wherein the cationic polymer content ranges from 0.0001% to 1% by weight of the binder.
11 . The concrete composition according to claim 1 , wherein the water-reducing additive comprising at least one phosphonic amino-alkylene group further comprises a poly oxyalkyl chain.
12 . The concrete composition according to claim 1 , wherein the water-reducing additive comprising at least one phosphonic amino-alkylene group corresponds to compound having the formula (1):
in which:
R is a hydrogen atom or a monovalent hydrocarbon group with 1 to 18 carbon atoms and optionally one or more hetero atoms;
the R i are similar or different and represent an alkylene for example ethylene, propylene, amylene, octylene or cyclohexene or an arylene, for example styrene or methylstyrene, the R i optionally comprising one or more hetero atoms;
Q is a hydrocarbon group with 2 to 18 carbon atoms and optionally one or more hetero atoms;
A is an alkylidene group with 1 to 5 carbon atoms;
the R j are similar or different and may be selected from:
the A-PO 3 H 2 group, A having the aforesaid meaning;
an alkyl group with 1 to 18 carbon atoms and being able to carry [R—O(R i —O) n ] groups, R and R i having the aforesaid meanings;
and the group:
R k designating a group such as R j ;
B designating an alkylene group with 2 to 18 carbon atoms;
“n” is a number greater than or equal to 0;
“r” is the sum of the [R—O(R i —O) n ] groups carried by all the R j ;
“q” is the number of [R—O(R i —O) n ] groups carried by Q;
the sum “r+q” is from 1 to 10;
“y” is an integer from 1 to 3;
Q, N and the R j can form together one or more cycles, this or these cycles further being able to contain one or more other hetero atoms.
13 . The concrete composition according to claim 1 , wherein the water-reducing additive comprising at least one phosphonic amino-alkylene group corresponds to compound having the formula (3):
in which:
M is a linear or branched hydrocarbon group optionally comprising one or more hetero atoms;
Q is a hydrocarbon group with 2 to 18 carbon atoms and optionally one or more hetero atoms;
“p” is the number of [M] groups carried by Q, p being from 1 to 10; and
“y” is an integer from 1 to 3.
14 . The concrete composition according to claim 1 , wherein the content of water reducing agent comprising at least one phosphonic amino-alkylene group ranges from 0.01% to 2% by weight of the total weight of the binder.
15 . The concrete composition according to claim 1 , wherein the weight ratio (water reducing agent comprising at least one phosphonic amino-alkylene group)/(cationic polymer) preferably-ranges from 2 to 8.
16 . A pre-mix comprising:
a hydraulic binder, as defined in claim 1 ;
a cationic polymer as defined in claim 1 , and
water-reducing additive comprising at least one phosphonic amino-alkylene group.
17 . (canceled)
18 . (canceled)
19 . A method for reducing the setting time of a concrete composition, the concrete composition comprising:
a hydraulic binder, wherein the hydraulic binder comprises Portland clinker and mineral addition selected from the group consisting of limestone, fly ash or combination thereof, the limestone and/or fly ash representing at least 50% by weight of the total weight of the binder, and
a water-reducing additive comprising at least one phosphonic amino-alkylene group, wherein the method comprises the step of adding a cationic polymer having a cationic charge density greater than 0.5 meq/g and an intrinsic viscosity less than 1 dl/g into the composition.
20 . The concrete composition according to claim 6 , wherein the additional mineral component is selected from the group consisting of slag, calcined clay, silica fume and combinations thereof.
21 . The concrete composition according to claim 10 , wherein the cationic polymer content ranges from 0.001% to 0.5% by weight of the total weight of the binder.
22 . The concrete composition according to claim 15 , wherein the weight ratio (water reducing agent comprising at least one phosphonic amino-alkylene group)/(cationic polymer) ranges from 3 to 6.