Ready-mix concrete or mortar, or precast concrete composition, comprising ground granulated blast furnace slag, an alkali sulfate activator and a pce type water reducing polymer

Process for preparing wet concrete or wet mortar composition classified in one of the slump flow classes S3, S4 and S5 according to standard NF EN 206, comprising a step of introducing in a mixing chamber, simultaneously or not, separately or not:

• at least one aggregate (A),
• a binder composition (B),
• at least one alkali sulfate activator (C),
• water (D) and
• at least one water reducing polymer (E),
• wherein the binder composition (B) comprises:
• (b1) Ground Granulated Blast Furnace Slag (GGBS),
• (b2) optionally at least one hydraulic binder other than GGBS, according to standard EN 197-1 and EN 197-5,
• (b3) optionally one or more supplementary cementitious materials, and
• (b4) optionally one or more filler materials,
• wherein the water reducing polymer (E)
• is a copolymer comprising the following monomeric units:
• wherein:
• represents a bonding site of a monomeric unit
• the quantity of monomeric units A is between 0 and 40 mol %,
• the quantity of monomeric units B is between 25 and 95 mol %,
• the quantity of monomeric units C is between 5 and 50 mol %,
• the quantity of monomeric units D is between 0 and 25 mol %,
• R1 and R2 are independently hydrogen or methyl,
• Z1 is a bond, a methyl or an ethyl,
• Z2 is a bond, —CH2CH2O—, —CH2CH2OCH2CH2O— or —CH2CH2CH2CH2O—
• R3 is —(CH2CH2O)m—R4, —(CH(CH3)CH2O)n—R4 or —(CH2CH2OCH(CH3)CH2O)y—R4
• m, n and y being an integer independently comprised between 7 and 100,
• R4 is hydrogen, methyl,
• R5 is hydrogen, methyl or —CH2COOH, and
• R6 is —OH, —OCH2OH, —OCH2CH2OH, —OCH2CH2CH2OH, —OCH2CH(CH3)CH2OH, —OCH2CH2CH2CH2OH, —NHR7, a group bearing a phosphate function, a group bearing phosphonate function or a group bearing sulfonate function,
• R7 being a saturated or unsaturated, linear or branched chain comprising from 2 to 12 carbon atoms and eventually one or more heteroatoms, preferably O, N or S, and
• wherein said wet concrete or wet industrial mortar composition remains classified in the same slump flow class during at least 2 hours after the having introduce all the quantities of A, B, C, D and E in the mixing chamber.

A method for maintaining a wet concrete composition or wet industrial mortar composition in a single slump flow class according to standard NF EN 206, during a time period of at least 2 hours, said composition comprising at least one aggregate (A), a binder composition (B), at least one alkali sulfate activator (C), water (D) and at least one water reducing polymer (E), wherein the binder composition (B) comprises:

• (b1) Ground Granulated Blast Furnace Slag (GGBS),
• (b2) optionally at least one hydraulic binder other than GGBS, according to standard EN 197-1 and EN 197-5,
• (b3) optionally one or more supplementary cementitious materials, and
• (b4) optionally one or more filler materials,
• wherein the water reducing polymer (E) is a copolymer comprising the following monomeric units:
• wherein:
• represents a bonding site of a monomeric unit
• the quantity of monomeric units A is between 0 and 40 mol %,
• the quantity of monomeric units B is between 25 and 95 mol %,
• the quantity of monomeric units C is between 5 and 50 mol %,
• the quantity of monomeric units D is between 0 and 25 mol %,
• R1 and R2 are independently hydrogen or methyl,
• Z1 is a bond, a methyl or an ethyl,
• Z2 is a bond, —CH2CH2O—, —CH2CH2OCH2CH2O— or —CH2CH2CH2CH2O—
• R3 is —(CH2CH2O)m—R4, —(CH(CH3)CH2O)n—R4 or —(CH2CH2OCH(CH3)CH2O)y—R4
• m, n and y being an integer independently comprised between 7 and 100,
• R4 is hydrogen, methyl,
• R5 is hydrogen, methyl or —CH2COOH, and
• R6 is —OH, —OCH2OH, —OCH2CH2OH, —OCH2CH2CH2OH, —OCH2CH(CH3)CH2OH, —OCH2CH2CH2CH2OH, —NHR7, a group bearing a phosphate function, a group bearing phosphonate function or a group bearing sulfonate function,
• R7 being a saturated or unsaturated, linear or branched chain comprising from 2 to 12 carbon atoms and eventually one or more heteroatoms, preferably O, N or S,
• wherein the time period of at least 2 hours begins when all the quantities of A, B, C, D and E have been introduced in a mixing chamber, and
• wherein the single slump flow class is S3, S4 or S5.

A method for providing a hardened low carbon GGBS containing binder-based concrete or mortar composition, an early-age compressive strength value, comparable with the one of a hardened 100% OPC binder-based concrete or mortar composition;

• wherein a wet precursor P1 of the low carbon GGBS containing binder-based concrete or mortar composition comprises at least one aggregate (A), a binder composition (B), at least one alkali sulfate activator (C), water (D) and at least one water reducing polymer (E), wherein the binder composition (B) comprises:
• (b1) Ground Granulated Blast Furnace Slag (GGBS),
• (b2) optionally at least one hydraulic binder other than GGBS, according to standard EN 197-1 and EN 197-5,
• (b3) optionally one or more supplementary cementitious materials, and
• (b4) optionally one or more filler materials,
• wherein said wet precursor P1 is classified in one of the slump flow classes S3, S4 and S5 according to standard NF EN 206, and,
• wherein said wet P1 remains classified in the same slump flow class during at least 2 hours after having introduced in a mixing chamber all the quantities of the components A, B, C, D and E
• wherein a wet precursor P2 of the 100% OPC binder-based concrete or mortar composition comprises the same components (A), (D), (E) as P1, the same concentrations of (A), 100% OPC, (D) and (E) as (A), (B), (D) and (E) of P1, and the same ratio C/100% OPC binder as the ratio C/B of P1;
• said method consisting in using a water reducing polymer (E) is a copolymer comprising the following monomeric units:
• wherein:
• represents a bonding site of a monomeric unit
• the quantity of monomeric units A is between 0 and 40 mol %,
• the quantity of monomeric units B is between 25 and 95 mol %,
• the quantity of monomeric units C is between 5 and 50 mol %,
• the quantity of monomeric units D is between 0 and 25 mol %,
• R1 and R2 are independently hydrogen or methyl,
• Z1 is a bond, a methyl or an ethyl,
• Z2 is a bond, —CH2CH2O—, —CH2CH2OCH2CH2O— or —CH2CH2CH2CH2O—
• R3 is —(CH2CH2O)m—R4, —(CH(CH3)CH2O)n—R4 or —(CH2CH2OCH(CH3)CH2O)y—R4
• m, n and y being an integer independently comprised between 7 and 100,
• R4 is hydrogen, methyl,
• R5 is hydrogen, methyl or —CH2COOH, and
• R6 is —OH, —OCH2OH, —OCH2CH2OH, —OCH2CH2CH2OH, —OCH2CH(CH3)CH2OH, —OCH2CH2CH2CH2OH, —NHR7, a group bearing a phosphate function, a group bearing phosphonate function or a group bearing sulfonate function,
• R7 being a saturated or unsaturated, linear or branched chain comprising from 2 to 12 carbon atoms and eventually one or more heteroatoms, preferably O, N or S.