Hydraulic compositions with low excess paste

Abstract

Low Excess Paste Hydraulic Compositions The present invention relates to an additive hydraulic composition comprising: - a hydraulic composition comprising: - a hydraulic binder composition, - water, and - aggregates, - at least one water-reducing or high-water-reducing additive selected from polycarboxylate polyalkoxylated polymers and polycarboxylate polyalkoxylated polymers, and any mixture thereof, and - at least one rheological agent, the hydraulic composition having an excess water volume (E) less than or equal to 11 liters of water per cubic meter of hydraulic composition, the excess water volume (E) being expressible by the following relationship: with: Effective water volume: the effective water volume of the hydraulic composition, expressed in liters of water per cubic meter of hydraulic composition; D: the water demand of the hydraulic binder composition, expressed in liters of water per kg of hydraulic binder composition;mliants: the mass of the hydraulic binder composition, expressed in kg of hydraulic binder composition per cubic meter of hydraulic composition; V0: the initial paste volume, expressed in liters per cubic meter of hydraulic composition; C: the compactness of the aggregates, expressed in liters per cubic meter of hydraulic composition; Vagrants: the volume of the aggregates expressed in liters per cubic meter of hydraulic composition. Figure for the abbreviation: None;

Description

Title of the invention: Hydraulic compositions with low excess paste

[0001] The present invention relates to hydraulic compositions having a small excess of water in the excess paste and having a specific additive allowing them to be made more fluid.

[0002] The present invention also relates to the use of specific additives to improve the fluidity of these hydraulic compositions.

[0003] A hydraulic composition traditionally consists of a hydraulic binder composition, water, and aggregates. The mixture of the hydraulic binder composition and water forms a paste, which, once mixed with the aggregates, will fill the spaces between the aggregates (intergranular volume) but will also be present in excess of this intergranular volume.

[0004] The excess paste volume, coupled with the excess water content of the excess paste volume, are important parameters influencing the viscosity of the hydraulic composition, and therefore, in particular, its flow velocities in different situations. Specifically, the greater the excess paste volume, the greater the average distance between the aggregates, thus facilitating their flow.

[0005] However, some hydraulic compositions cannot have a sufficient excess of water in the excess paste to ensure good workability, particularly proper flow. For example, hydraulic compositions with reduced clinker content are produced from hydraulic binder compositions in which a portion of the clinker is replaced by mineral additions. This leads formulators to significantly lower the water / binder ratio of hydraulic compositions based on such hydraulic binder compositions in order to promote the development of short-term strength and avoid impacting the durability of the structure. This reduction in the water / binder ratio directly results in an increased dosage of plasticizer or superplasticizer additives and an increase in the viscosity of the hydraulic composition.The intrinsic properties of mineral additions can also cause the increased viscosity of the hydraulic composition, as the water demand of some mineral additions is higher than that of conventional cements containing high proportions of clinker. However, since the amount of water introduced into these compositions must not be too high in order to maintain high mechanical strength, the excess paste volume and the excess water within that paste volume are lower than for conventional hydraulic compositions based on Portland cement, thus increasing... viscosity. The same problem arises for hydraulic compositions with very high mechanical performance (even those mainly based on clinker), because obtaining these very high performances involves in particular reducing the amount of water introduced, therefore an increase in viscosity and a loss of workability associated with the increase in viscosity, compared to conventional hydraulic compositions.

[0006] The aim of the invention is then to propose an adjuvant enabling the reduction of the viscosity of hydraulic compositions having a small excess of water in the volume of excess paste.

[0007] To this end, the invention relates to an additive hydraulic composition comprising:

[0008] - a hydraulic composition comprising a hydraulic binder composition, of water, and aggregates,

[0009] - at least one water-reducing or high-strength water-reducing adjuvant selected from polycarboxylate polyalkoxylated polymers and phosphonate polyalkoxylated polymers, and any mixtures thereof, and

[0010] - at least one rheological agent,

[0011] the hydraulic composition having a volume of excess water E less than or equal to 11 liters of water per cubic meter of hydraulic composition, the volume of excess water E being able to be expressed by the following relation: । X ™

[0012] with:

[0013] Effective water volume ■ the effective water volume of the hydraulic composition, expressed in liters of water per cubic meter of hydraulic composition;

[0014] D: the water demand of the hydraulic binder composition, expressed in liters of water per kg of hydraulic binder composition;

[0015] ruants: the mass of the hydraulic binder composition, expressed in kg of hydraulic binder composition per cubic meter of hydraulic composition;

[0016] Vo: the initial volume of paste, expressed in liters per cubic meter of hydraulic composition;

[0017] C: the compactness of the aggregates of the hydraulic composition, expressed in liters per cubic meter of hydraulic composition;

[0018] Vgranuiats* the volume of aggregates, expressed in litres per cubic meter of hydraulic composition.

[0019] The inventors have indeed discovered, surprisingly, that the addition of a rheological agent, known in principle to increase the viscosity of compositions Hydraulics, on the contrary, allows the viscosity of hydraulic compositions with a specific excess water volume E to be reduced.

[0020] The present invention is therefore based on the beneficial use of rheological agents under conditions where the hydraulic composition meets a condition established according to the calculation of an essential parameter E called here the excess water volume.

[0021] For the purposes of the application, "hydraulic composition with admixture" means a hydraulic composition comprising the hydraulic composition as defined above and at least one water-reducing or high water-reducing admixture and a rheological admixture (and possibly additional admixtures), and "hydraulic composition" means the hydraulic composition free of admixture. Volume of excess water E

[0022] The excess water volume E represents the volume of excess water contained in the excess paste volume of the hydraulic composition. It is important to emphasize that this characteristic relates to the hydraulic composition, that is, the untreated hydraulic composition, therefore specifically before the addition of the water-reducing agent(s) or high water-reducing agent(s) and the rheological agent(s).

[0023] In detail, E is determined as follows:

[0024] 1 / The initial paste volume V 0, in liters per cubic meter of hydraulic composition, is determined. It is equal to the sum of the volumes of the hydraulic binder composition and effective water, including the volume of air. The paste results from the mixing of the hydraulic binder composition and water, and therefore necessarily also contains air, introduced during mixing.

[0025] 2 / The compactness C reflects the fact that the aggregates (= the granular sand mixture) The aggregate (including gravel) in a hydraulic composition does not fully fill the space but leaves unoccupied voids. This is due to the grain shapes, which are more or less spherical or irregular, and to the relative size differences between both sand (0 to 4 mm) and gravel (4 to 22 mm), as well as the size distribution within each category (polydispersity). Formulating a hydraulic composition means finding a mixture of sand and gravel that leaves as few voids as possible, because otherwise these voids will first be filled by the paste without the paste having a beneficial effect on fluidity.

[0026] The compactness C of the granular mixture of the hydraulic composition (of the aggregates of the hydraulic composition), for a given compaction index for the evaluated concrete application, expressed in liters per cubic meter of hydraulic composition, is determined by the characterization of the ultimate compactness of the granular mixture <pma x , correspondant à la compacité ultime du mélange granulaire sous application d’une énergie de serrage infinie, par l’intermédiaire du Modèle d’Empilement Compressible (MEC) developed by De Larrard and Sedran (“Granular structures and concrete formulation”, François de Larrard, LCPC- Engineering structure OA 34).

[0027] To determine this ultimate compactness of the granular mixture <pma x, la compacité de chaque coupure granulaire constituant le mélange granulaire de la composition hydraulique doit être mesurée séparément, par l’essai de compacité des fractions granulaires à la table à secousses (« Essai de compacité des fractions granulaires à la table à secousses, Mode opératoire - Méthode d’essai n°61 » LCPC, Juillet 2004).

[0028] The objective of the compactness test of granular fractions on the shaking table is to determine the compactness of a granular fraction (of an aggregate) of a determined mass when it is subjected, in a cylinder, to a defined mechanical stress.

[0029] To this end, the test consists of inserting a sample of aggregates into a hollow cylindrical steel mold under the pressure of a solid steel piston with an outer diameter equal to the inner diameter of the mold minus 1 mm, and applying mechanical shocks to the assembly, thus rearranging the grains and compacting the aggregate sample. The final measurement of the test is the apparent density of the sample, thereby allowing the calculation of the compactness of the tested granular fraction. The compaction energy used for this test corresponds to a compaction index of 9.

[0030] In addition to this test, the particle size distribution curve of each particle size fraction used in the hydraulic composition must be measured according to NF EN 933-1:2012.

[0031] From these different data, the compressible packing model (CPM) is used to determine the ultimate packing density <pma xpour lesproportions de chaque coupure granulaire des granulats de la composition hydraulique étudiée, en se basant sur la compacité ultime d’un granulat puis sur le mélange de plusieurs coupures granulaires. Ce modèle permet ensuite de calculer la compacité réelle C du mélange granulaire de la composition hydraulique à partir de la compacité ultime <pma x et de l’énergie de serrage (mise de place) de cette composition hydraulique. En fonction du type d’application de la composition hydraulique, l’indice de serrage à considérer est différent.

[0032] 3 / The water demand D of the hydraulic binder composition, expressed in litres The water requirement per kg of hydraulic binder composition is determined by the method described in standard NF EN 196-3 for determining the standardized consistency of a cement paste. The water requirement of a hydraulic binder composition corresponds to the quantity of water to be added to a given mass of hydraulic binder composition to obtain a reference consistency of the resulting paste.

[0033] 4 / The volume of excess paste V}, expressed in liters per cubic meter of Hydraulic composition is calculated by taking the difference between the compactness of the aggregates C and the volume occupied in litres by the aggregates per cubic meter of hydraulic composition, i.e.: U - r .... V ,

[0034] Indeed, the excess paste is calculated by the difference between the paste volume of the concrete mix design (without taking into account fines < 125 µm, as these are included in the calculation of the mixture's compactness) and the porosity of the aggregate mixture, i.e., the complement to 100% of the aggregate compactness C defined above. The paste volume fraction is itself calculated by the sum of the ratios of the masses of water, hydraulic binder, and fines of aggregates smaller than 125 µm to their respective densities, as well as the air contained in the hydraulic composition (measured according to NF EN 12350-7:2019), i.e.: v

[0035] In this equation, n is the number of components of the hydraulic composition belonging to the family of paste components (binders, water, aggregate fines, and entrapped air), m is their mass per cubic meter of hydraulic composition, and qt is their density. This yields a volume fraction of paste (expressed in liters per cubic meter of hydraulic composition) which must then be compared to the volume fraction of voids present in the aggregate mixture.

[0036] Using the previous formalism, the volume of granular voids is 1-C, while the volume of paste is by definition the complement to 100% of the volume of aggregates, i.e. 1-Vgranuiats. We deduce that the excess of paste is 1-Vgranuiats - (1-C) = C - Vgmnuiats, expressed therefore in liters per cubic meter of hydraulic composition.

[0037] 5 / The volume of excess water per cubic meter of hydraulic composition V2 is calculated by the difference between the effective water volume (which corresponds to the water volume of the concrete mix minus the water absorbed by the aggregates) expressed in liters of water per cubic meter of hydraulic composition, and the product of the water demand by the mass of the hydraulic binder composition per cubic meter of hydraulic composition, i.e.: v. — v... ..... nv .... HAS

[0038] 6 / The excess water volume fraction K is calculated with respect to the volume of initial paste V 0: A " <

[0039] 7 / The volume of excess water E contained in the volume of excess paste Vi is calculated: â—kx V)

[0040] The inventors discovered that when the value of E is less than 11 liters per cubic meter of hydraulic composition, the addition of rheological agents in addition to the water reducing agent or high water reducing agent surprisingly produces a decrease in viscosity as measured by the inverted cone method.

[0041] E expressing a quantity of water which is relative, the value of E can be zero, and even negative in case of a deficit of water, dough or both.

[0042] Preferably, the excess water volume E is between -10 and 10 liters of water per cubic meter of hydraulic composition, preferably between -10 and 9 liters per cubic meter, preferably between -10 and 8 liters per cubic meter. Rheological agent

[0043] The hydraulic adjuvant composition according to the invention comprises at least one rheological agent.

[0044] The rheological agents of the invention are preferably compounds capable of increasing the yield stress of the hydraulic composition paste and / or the viscosity of the hydraulic composition paste. These agents are therefore compounds that, in particular, increase the flow rate of a hydraulic composition comprising them.

[0045] It should be noted that the dosage of rheological agent(s) in the additive hydraulic composition of the invention is broad, as it depends on the nature of the rheological agent. For a given hydraulic composition, in particular a hydraulic composition already additive with one or more reducing agents or high-strength water reducers, the dosage of rheological agent(s) can be adapted on a case-by-case basis depending on the nature of the rheological agent(s).

[0046] Preferably, the rheological agent(s) and the dosages associated with each rheological agent in a hydraulic composition already modified, in particular by one or more reducing or high-reducing water agents and any other additives (excluding rheological agents) (referred to as the "adjusted hydraulic composition under study" in the remainder of Protocol A), is or are determined by means of a series of smear measurements on a Schmidt ring (cylinder with an internal diameter of 60 mm and a height of 50 mm) of a volume of 141 mL of paste. The idea is to perform this series The test involves measuring the hydraulic composition of the paste being studied, to which one or more rheological agents are to be added. The paste contains an increasingly higher proportion of rheological agents until the appropriate concentration is reached. This test is carried out according to the following protocol (protocol A): - Preparation of an additive paste, by mixing with a Rayneri mixer at 500 rpm for 4 minutes: water, a hydraulic binder composition, one or more reducing agents or high water reducers, and any other additives from the hydraulic additive composition under study. The hydraulic binder composition, the water / binder ratio, the reducing agents or high water reducers and any other additives, and the quantity of reducing agents or high water reducers and any other additives are those of the hydraulic additive composition under study. This additive paste is named Po; - Filling the Schmidt ring with a volume of 141 mL of adjuvanted paste Po; - Measurement of the spread over two perpendicular diameters after lifting the cone; - The initial spreading value of the paste Po corresponds to the reference value without rheological agent (So); - Carry out the same test on other pastes Sb S2, .. .Sx with different dosages of rheological agent than paste So, all other things being equal. The dosage increment can, for example, be 0.001% of active material of rheological agent relative to the mass of the hydraulic binder composition; - Each spread obtained is noted Si, S2,... Sx, x being the last dosage evaluated. - The required dosage is obtained when a measured spreading value is between 60% and 90% of So, preferably between 60% and 80% of So, preferably between 60% and 70% of So.

[0047] Thus, the rheological agent(s) are present in the adjuvanted hydraulic composition in a total quantity that allows the spreading value of an adjuvanted paste to be between 60% and 90%, preferably between 60% and 80%, preferably between 60% and 70%, of the spreading value of an adjuvanted paste free of rheological agent, as determined according to protocol A defined above. The adjuvanted paste comprises (or consists of) water, the hydraulic binder composition, any other adjuvants (excluding rheological agents), and the rheological agent(s) present in said total quantity. The adjuvanted paste free of rheological agent It includes (or consists of) water, the hydraulic binder composition, and any other additives (excluding rheological agents). Adjuvanted paste free of rheological agents differs from adjuvanted paste only in that it lacks a rheological agent.

[0048] Preferably, the rheological agent is chosen from:

[0049] - polysaccharide gums, for example diutan gums, gums xanthan gum, welan gum, guar gum and guar ethers, including hydroxyethyl guar, hydroxypropyl guar and carboxymethyl guar, gellan gum, starch and starch ethers,

[0050] - celluloses and cellulose ethers, including the alkyl, hydroxyalkyl and carboxyalkyl,

[0051] - high molar mass polycarboxylates, preferably with a molar mass greater than 100,000 g / mol, preferably with a molar mass greater than 200,000 g / mol,

[0052] - polyethylene glycol (PEG) and polyethylene glycol monomethyl ether (MPEG), preferably with a molar mass greater than 100,000 g / mol,

[0053] - latexes, for example those of the methacrylic copolymer and acrylate ester type ethyl

[0054] - polyacrylamides,

[0055] - polyvinyl alcohols,

[0056] - clays, for example sepiolite and bentonite type clays,

[0057] - sodium alginates, and

[0058] - any one of their mixtures.

[0059] Preferably, the latexes comprise (or are made of) at least one polymer and / or copolymer selected from the group consisting of homopolymers of (meth)acrylic acid, and esters of these acids having the ester group in C1 to C12, such as methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, 2-ethylhexyl, 2-ethylbutyl, 2-heptylhexyl, copolymers of (meth)acrylic acid and / or esters of these acids having the ester group in C1 to C12, vinyl and (meth)acrylic acid copolymers, vinyl and C12 Cl ester copolymers, (meth)acrylic acid copolymers, (meth)acrylic acid and (meth)acrylic ester copolymers, styrene-(meth)acrylic copolymers, ethylene-vinyl acetate copolymers, ethylene-(meth)acrylic acid copolymers, acrylic / urethane copolymers, styrene-butadiene copolymers.

[0060] Preferably, the rheological agent is chosen from:

[0061] - polysaccharide gums, for example diutan gums, gums xanthan gum, welan gum, guar gum and guar ethers, including Hydroxyethyl guar, hydroxypropyl guar and carboxymethyl guar, gellan gums, starch and starch ethers,

[0062] - celluloses and cellulose ethers, including the alkyl, hydroxyalkyl and carboxyalkyl,

[0063] - high molar mass polycarboxylates, preferably with a molar mass greater than 100,000 g / mol, preferably with a molar mass greater than 200,000 g / mol, and

[0064] - any one of their mixtures.

[0065] Preferably, the total mass content of rheological agent is between 0.0001% and 0.1% by mass, preferably between 0.0005% and 0.08% by mass, preferably between 0.0010% and 0.06%, preferably between 0.0010% and 0.04% relative to the mass of the hydraulic binder composition.

[0066] If the hydraulic additive composition comprises several (at least two) rheological agents, the above content ranges therefore refer to the total content of all the rheological agents. Since these contents relate to the mass of the hydraulic binder composition, they are expressed relative to the dry mass of the hydraulic binder composition. Water-reducing additive or high-strength water reducer

[0067] The hydraulic adjuvant composition of the invention comprises at least one water-reducing or high-water-reducing adjuvant selected from polyalkyl polycarboxylate polymers and polyalkyl phosphonate polymers, and any of their mixtures.

[0068] Preferably, the polycarboxylate polyalkoxylated polymers comprise units of formulas (I) and (II), and optionally units of formula (III), as follows: amo or.w cm

[0069] in which

[0070] - “R2” and “R3” each independently represent a hydrogen or a methyl,

[0071] - "M" represents each independently H+ or a chosen valence cation v among an alkali metal cation, an alkaline earth metal cation, a divalent or trivalent metal cation, an ammonium cation or an organic ammonium cation,

[0072] - when "M" represents H+, "v" represents 1, and when "M" represents a cation as defined above, "v" is the valence of the cation M,

[0073] - “R7” and “R8” each independently represent a hydrogen, a methyl or a formula group -C00(M)i / v with M and v as defined above,

[0074] - "m" represents 0, 1 or 2,

[0075] - "p" represents 0 or 1,

[0076] - "X" is O or NR9, "R9" representing H, a C1-C20 alkyl group, a group cycloalkyl or an alkylaryl group, and

[0077] - "RI" represents a C1-C20 alkyl group, a cycloalkyl group, a group alkylaryl, or -[Alkyl-O]z-R6, in which the "Alkyl" in each [Alkyl-O] unit independently represents a linear or branched alkylene comprising 2 to 4 carbon atoms, and "R6" represents H, a Cl- to C2O alkyl group, a cyclohexyl group, or an alkylaryl group, and "z" is an integer from 2 to 250,

[0078] - "a" is a number from 0.05 to 0.95, "a" being the mole fraction of units of formula (I) in the polymer,

[0079] - "b" is a number ranging from 0.05 to 0.95, "b" being the mole fraction of units of formula (II) in the polymer,

[0080] - "L" represents a linking group to the main chain of the polymer, and is in particular chosen from a direct bond (no atom between the main chain and the W group or the carbon bearing the RI 1 group), an oxygen atom, an -NR12- ​​group, R12 being a hydrogen or an alkyl group in Cl to C6, and an alkylene group in C1-C6, preferably L is an oxygen atom or an -NR12- ​​group, advantageously L is an oxygen atom,

[0081] - n = 0 or 1, and if n = 1, "W" is a spacer group, in particular a group an alkylene in Cl at C20 preferably in C1-C6, possibly substituted, or a group of formula -[Alkyl-O]t- in which the 'Alkyl' of each [Alkyl-O] unit independently represents an alkylene group comprising 2 to 4 carbon atoms, and 't' is an integer ranging from 1 to 500, preferably W is an alkylene group in Cl at C6,

[0082] - "RIO" each independently represents a monovalent group, in particular chosen from a hydrogen, an alkyl group in Cl to C6, and a group of the formula -[Alkyl-O]t-R13 in the "Alkyl" of each unit [Alkyl-O] each independently represents an alkylene group of 2 to 4 carbon atoms, "t" is an integer ranging from 1 to 500 and "R13" is chosen from a hydrogen and an alkyl in Cl to C3, or "RIO" is a cation, notably an alkali, alkaline earth or ammonium cation (and then the last O of the -[Alkyl-O]t group is O);

[0083] - “RI 1” is a monovalent group, in particular is chosen from an atom of hydrogen, a hydroxyl group and an alkyl group in Cl to CIO, preferably "RI 1" is a hydroxyl group; and

[0084] - "c" is a number ranging from 0 to 0.15, "c" being the mole fraction of units of formula (III) in the polymer.

[0085] An atom or group of atoms defined as "representing independently" or "each representing independently" means that each of these atoms or groups of atoms can each be different from one unit of the polymer to another.

[0086] Preferably, polycarboxylate polyalkoxylated polymers have a comb-like structure.

[0087] The following embodiments for the formulas (I), (II) and (III) of the polycarboxylate polyalkoxylated polymer units can be considered independently or combined with each other in any combination:

[0088] - “R2” represents H, and / or

[0089] - “R7” represents H, and / or

[0090] - "R3" each independently represents a hydrogen or a methyl, and / or

[0091] - "R8" each independently represents a hydrogen or a methyl, and / or

[0092] - either p = 0 and m = 1 or 2, preferably 1, or p = 1 and m = 0, and / or

[0093] - X = O, and / or

[0094] - RI = -[Alkyl-O]z-R6, preferably with:

[0095] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0096] - at least 80% of the Alkyl in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0097] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 25 to 75, and / or

[0098] - “R6” represents H or Me, and / or

[0099] - "M" represents H or a monovalent or divalent cation, "m" then representing 1 or 2, the monovalent cation being preferably chosen from an ammonium salt NH4+, a primary, secondary, tertiary or quaternary ammonium cation and an alkali metal cation, such as a sodium, lithium or potassium ion, and the divalent cation being preferably an alkaline earth metal cation, such as a magnesium or calcium ion, and / or

[0100] - "a" is a number from 0.20 to 0.90, preferably "a" is a number from 0.40 to 0.85, and / or

[0101] - "b" is a number from 0.10 to 0.80, preferably "b" is a number from 0.15 to 0.60, and / or

[0102] - n = 0, and / or

[0103] - L is an oxygen atom, and / or

[0104] - "RIO" is a hydrogen, and / or

[0105] - “RI 1” is a hydroxyl group, and / or

[0106] - "c" is a number from 0 to 0.12, preferably from 0 to 0.10.

[0107] Preferably, in units of formula (I):

[0108] - "R2" represents H,

[0109] - "R3" each independently represents a hydrogen or a methyl,

[0110] - "M" is H, sodium or calcium, preferably H,

[0111] - "a" is a number from 0.20 to 0.90, preferably "a" is a number from from 0.40 to 0.85.

[0112] Preferably, in units of formula (II):

[0113] - "R7" represents H,

[0114] - "R8" each independently represents a hydrogen or a methyl,

[0115] -X = O,

[0116] - RI = -[Alkyl-O]z-R6, preferably with:

[0117] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0118] - at least 80% of the "Alkyl" of the group -[Alkyl-O]z- represent -CH2-CH2-, or even all the "Alkyl" in the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0119] - "z" represents an integer from 5 to 200, in particular from 10 to 100, of preference from 25 to 75, and / or

[0120] - “R6” represents H or Me,

[0121] - either p = 0 and m = 1 or 2, preferably 1, or p = 1 and m = 0, and

[0122] - "b" is a number from 0.10 to 0.80, preferably "b" is a number from from 0.15 to 0.60.

[0123] Preferably, in units of formula (III):

[0124] - n = 0,

[0125] - L is an oxygen atom or an -NR12- ​​group, advantageously L is an atom of oxygen,

[0126] - "RIO" each independently represents a hydrogen, an alkyl group in C1-C6, or "RIO", is a cation, in particular an alkali, alkaline earth, or ammonium cation; preferably, RIO is a hydrogen.

[0127] - "RI 1" is a hydroxyl group, and

[0128] - "c" is a number from 0 to 0.12, preferably from 0 to 0.10.

[0129] According to one embodiment, “c” = 0. In other words, the polymer does not comprise formula units (III).

[0130] According to a more specific embodiment, the formula units (II) of the polycarboxylate polyalkoxylated polymers are such that p = 0 and m = 1 or 2, preferably 1, and "c" = 0.

[0131] Preferably, according to this embodiment:

[0132] - "R2" represents H, and / or

[0133] - "R7" represents H, and / or

[0134] - "R3" each independently represents a hydrogen or a methyl, of preference R3 = H and / or

[0135] - "R8" each independently represents a hydrogen or a methyl, of preference R8 = Me, and / or

[0136] - X = O, and / or

[0137] - RI = -[Alkyl-O]z-R6, preferably with:

[0138] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0139] - at least 80% of the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0140] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 25 to 75, and / or

[0141] - "R6" represents H or Me, preferably "R6" represents H, and / or

[0142] - "M" represents H or a monovalent or divalent cation, "m" then representing 1 or 2, the monovalent cation being preferably chosen from an ammonium salt NH4+, a primary, secondary, tertiary or quaternary ammonium cation and an alkali metal cation, such as a sodium, lithium or potassium ion, and the divalent cation being preferably an alkaline earth metal cation, such as a magnesium or calcium ion, and / or

[0143] - "a" is a number from 0.30 to 0.95, preferably a is a number from 0.50 to 0.90, and / Or

[0144] - "b" is a number from 0.05 to 0.70, preferably b is a number from 0.10 to 0.50.

[0145] Preferably,

[0146] - "R2" represents H,

[0147] - "R3" represents each independently H or a methyl, advantageously is H,

[0148] - "M" is H, sodium or calcium, preferably H,

[0149] - "R7" represents H,

[0150] - “R8” represents each independently H or a methyl, advantageously is a methyl,

[0151] -X = O,

[0152] - RI = -[Alkyl-O]z-R6, preferably with:

[0153] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0154] - at least 80% of the "Alkyl" of the group -[Alkyl-O]z- represent -CH2-CH2-, or even all the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, and / or

[0155] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 25 to 75, and / or

[0156] - "R6" represents H or Me, preferably "R6" represents H.

[0157] - "a" is a number from 0.30 to 0.95, preferably "a" is a number from 0.50 to 0.90, and

[0158] - "b" is a number from 0.05 to 0.70, preferably "b" is a number from 0.10 to 0.50.

[0159] According to another embodiment, the formula units (II) of the polycarboxylate polyalkoxylated polymers are such that p = 1 and m = 0.

[0160] Preferably, according to this embodiment:

[0161] - "R2" represents H, and / or

[0162] - "R7" represents H, and / or

[0163] - "R3" each independently represents a hydrogen or a methyl, and / or

[0164] - "R8" each independently represents a hydrogen or a methyl, and / or

[0165] - X = O, and / or

[0166] - RI = -[Alkyl-O]z-R6, preferably with:

[0167] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0168] - at least 80% of the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0169] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 15 to 50, and / or

[0170] - "R6" represents H or Me, preferably R6 represents Me,

[0171] and / or

[0172] - "M" represents H or a monovalent or divalent cation, "m" then representing 1 or 2, the monovalent cation preferably being chosen from an ammonium salt NH4+, a primary, secondary, tertiary or quaternary ammonium cation and an alkali metal cation, such as a sodium, lithium or potassium ion, and the divalent cation preferably being a cation of an alkaline earth metal, such as a magnesium or calcium ion, and / or

[0173] - "a" is a number from 0.30 to 0.80, preferably "a" is a number from 0.40 to 0.70, and / or

[0174] - "b" is a number from 0.20 to 0.70, preferably "b" is a number from 0.30 to 0.60, and / or

[0175] - n = 0, and / or

[0176] - L is an oxygen atom or an -NR12- ​​group, advantageously L is an atom of oxygen,

[0177] - "RIO" each independently represents a hydrogen, an alkyl group in C1-C6, or "RIO", is a cation, in particular an alkali, alkaline earth, or ammonium cation; preferably, RIO is a hydrogen.

[0178] - "RI 1" is a hydroxyl group, and

[0179] - "c" is a number from 0 to 0.12, preferably from 0 to 0.10.

[0180] Preferably,

[0181] - "R2" represents H,

[0182] - "R3" represents each independently H or a methyl, advantageously is a methyl,

[0183] - "M" is H, sodium or calcium, preferably H,

[0184] - "R7" represents H,

[0185] - "R8" represents each independently H or a methyl group,

[0186] -X = O,

[0187] - RI = -[Alkyl-O]z-R6, preferably with:

[0188] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0189] - at least 80% of the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0190] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 15 to 50, and / or

[0191] - "R6" represents H or Me, preferably "R6" represents Me,

[0192] - "a" is a number from 0.30 to 0.80, preferably "a" is a number from 0.40 to 0.70,

[0193] - "b" is a number from 0.20 to 0.70, preferably "b" is a number from 0.30 to 0.60,

[0194] - L is an oxygen atom,

[0195] - "RIO" is a hydrogen,

[0196] - “RI 1” is a hydroxyl group,

[0197] - "c" is a number from 0 to 0.12, preferably from 0 to 0.10.

[0198] According to a first alternative, according to the embodiment in which the formula units (II) of the polycarboxylate polyalkoxylated polymers are such that p = 1 and m = 0, the polymer comprises units (III).

[0199] Thus, "c" is preferably strictly greater than 0. Preferably, "c" is a number from 0.005 to 0.15, preferably from 0.01 to 0.12, preferably from 0.02 to 0.010, preferably from 0.04 to 0.08.

[0200] According to this alternative,

[0201] - "R2" represents H, and / or

[0202] - "R7" represents H, and / or

[0203] - "R3" each independently represents a hydrogen or a methyl, of preferably a methyl group, and / or

[0204] - "R8" each independently represents a hydrogen or a methyl, of preferably a methyl group, and / or

[0205] - X = O, and / or

[0206] - RI = -[Alkyl-O]z-R6, preferably with:

[0207] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0208] - at least 80% of the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0209] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 15 to 50, and / or

[0210] - "R6" represents H or Me, preferably R6 represents Me,

[0211] and / or

[0212] - "M" represents H or a monovalent or divalent cation, "m" then representing 1 or 2, the monovalent cation being preferably chosen from an ammonium salt NH4+, a primary, secondary, tertiary or quaternary ammonium cation and an alkali metal cation, such as a sodium, lithium or potassium ion, and the divalent cation being preferably an alkaline earth metal cation, such as a magnesium or calcium ion, and / or

[0213] - "a" is a number from 0.30 to 0.80, preferably "a" is a number from 0.40 to 0.70, and / or

[0214] - "b" is a number from 0.20 to 0.70, preferably "b" is a number from 0.30 to 0.60, and / or

[0215] - n = 0, and / or

[0216] - L is an oxygen atom or an -NR12- ​​group, advantageously L is an atom of oxygen,

[0217] - "RIO" each independently represents a hydrogen, an alkyl group in C1-C6, or "RIO", is a cation, in particular an alkali, alkaline earth, or ammonium cation; preferably, RIO is a hydrogen.

[0218] - "RI 1" is a hydroxyl group, and

[0219] - "c" is a number ranging from 0.005 to 0.15, preferably from 0.01 to 0.12, of preferably from 0.02 to 0.010, preferably from 0.04 to 0.08.

[0220] According to another embodiment, the formula units (II) are present in the form of two distinct subunits (Ilb') and (Ilb”). The two subunits (Ilb') and (Ilb”) are of formula (II), according to any embodiment of the formula units (II) defined above, but are different from each other. The units (I) and (III), if present, are according to any embodiment defined above.

[0221] Preferably, according to this embodiment, "a" is a number from 0.30 to 0.80, preferably from 0.40 to 0.70, alternatively from 0.25 to 0.50, "a" being the mole fraction of units of formula (I) in the polymer, "b'" is a number from 0.10 to 0.35, preferably from 0.15 to 0.30, alternatively from 0.10 to 0.25, "b'" being the mole fraction of units (Ilb') in the polymer, and "b"" is a number from 0.10 to 0.35, preferably from 0.15 to 0.30, alternatively from 0.25 to 0.50, "b"" being the mole fraction of units (Ilb") in the polymer.

[0222] Preferably, according to this embodiment, “c” = 0. Preferably, the polymer therefore does not comprise (III) units.

[0223] Preferably, in units (Ilb'):

[0224] - "R7" represents H,

[0225] - "R8" each independently represents a hydrogen or a methyl,

[0226] - either p = 0 and m = 1 or 2, preferably 1, or p = 1 and m = 0, preferably p = 1 and m = 0,

[0227] - X = O,

[0228] - RI = -[Alkyl-O]z-R6, preferably with:

[0229] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0230] - at least 80% of the Alkyl of the group -[Alkyl-O]z- represent -CH2-CH2-, or even all the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, and / or

[0231] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 15 to 50, and / or

[0232] - "R6" represents H or Me, preferably "R6" represents Me.

[0233] - "b'" is a number from 0.10 to 0.35, preferably from 0.15 to 0.30, alternatively from 0.10 to 0.25, where "b'" is the mole fraction of formula units (Ilb') in the polymer.

[0234] Preferably, in units (Ilb”):

[0235] - "R7" represents H,

[0236] - "R8" each independently represents a hydrogen or a methyl, of preference R8 = Me,

[0237] - either p = 0 and m = 1 or 2, preferably 1, or p = 1 and m = 0,

[0238] - X = O,

[0239] - RI = -[Alkyl-O]z-R6, preferably with:

[0240] - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2- CHMe-, -CHMe-CH2-, and / or

[0241] - at least 80% of the Alkyls in the -[Alkyl-O]z- group represent -CH2-CH2-, or even all The alkyls of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or

[0242] - "z" represents an integer from 5 to 200, in particular from 10 to 100, preferably from 15 to 30, for example from 5 to 30, and / or

[0243] - "R6" represents H or Me, preferably "R6" represents Me.

[0244] - "b" is a number from 0.10 to 0.35, preferably from 0.15 to 0.30, alternatively from 0.25 to 0.50, where “b” is the mole fraction of formula units (Ilb”) in the polymer.

[0245] Preferably, the polyalkoxylated phosphonate polymers have the following formula (IV): RJ

[0246] in which

[0247] - "R5" is a hydrogen atom or a monovalent hydrocarbon group comprising from 1 to 18 carbon atoms and possibly one or more heteroatoms;

[0248] - the "Ri"s are similar or different from each other and represent an alkylene such as ethylene, propylene, butylene, amylene, octylene or cyclohexene, or an arylene such as styrene or methylstyrene, the "Ri" possibly containing one or more heteroatoms;

[0249] - “Q” is a hydrocarbon group comprising from 2 to 18 carbon atoms and possibly one or more heteroatoms;

[0250] - "A" is an alkylene group comprising 1 to 5 carbon atoms;

[0251] - the "Rj"s are similar or different from each other and can be chosen from:

[0252] - the group A-PO3H2, A having the aforementioned meaning,

[0253] - an alkyl group comprising from 1 to 18 carbon atoms and capable of bearing groupings [R5-O(Ri-O)m], R5 and Ri having the aforementioned meanings,

[0254] - "m" is a number greater than or equal to 0,

[0255] - "r" is the number of [R5-O(Ri-O)m] groups carried by the set of Rj,

[0256] - "q" is the number of [R5-O(Ri-O)m] groups carried by Q, the sum

[0257] - "r+q" is between 1 and 10,

[0258] - "y" is an integer between 1 and 3,

[0259] - "Q", "N" and the "Rj" can together form one or more cycles, this or these cycles which may also contain one or more other heteroatoms.

[0260] In a particularly preferred manner, polyalkoxylated phosphonates consist of a water-soluble or water-dispersible organic compound comprising at least one amino-di-(alkylene-phosphonic) group and at least one polyoxyalkylated chain or at least one of its salts.

[0261] Preferably, the polyalkoxylated phosphonate is a compound of formula (IV) in which:

[0262] “R5” is a hydrogen atom or a monovalent, saturated hydrocarbon group or not, comprising from 1 to 8 carbon atoms and possibly one or more heteroatoms;

[0263] the "Ri" represent ethylene or propylene or a mixture of ethylene or propylene, preferably 60% to 100% of the "Ri" are ethylene groups;

[0264] “Q” is a hydrocarbon group comprising 2 to 8 carbon atoms and, possibly, one or more heteroatoms;

[0265] “A” is the methylene group;

[0266] each of the "Rj" represents the CH2-PO3H2 group;

[0267] “m” is an integer between 10 and 250;

[0268] “q” is an integer equal to 1 or 2;

[0269] “y” is an integer equal to 1 or 2, preferably equal to 1.

[0270] In particular, the polyalkoxylated phosphonate may be a polyalkoxylated phosphonate of formula (IV) in which "R5" is a methyl group, the "Ri" are ethylene and propylene groups, "m" being between 30 and 50, "r+q" is 1, "Q" is a propylene group, "A" is a methylene group, "y" is 1 and "Rj" corresponds to the CH2-PO3H2 group.

[0271] According to one embodiment, the hydraulic adjuvant composition according to the invention comprises a mixture of at least two water reducing agents or high water reducing agents, each being independently according to any one of the embodiments defined above.

[0272] The adjuvanted hydraulic composition may therefore comprise a mixture of at least two or three polyalkyl polycarboxylate polymers, and optionally at least one polyalkyl phosphonate polymer, the polymers being according to any embodiment defined above.

[0273] The hydraulic adjuvant composition may also include a mixture of at least two polyalkyl polycarboxylate polymers, or a mixture of at least two polyalkyl phosphonate polymers, or a mixture of at least one polyalkyl polycarboxylate polymer and at least one polyalkyl phosphonate polymer, the polymers each being independently according to any one of the embodiments defined above.

[0274] Preferably, the water-reducing or high-reducing adjuvant is selected from:

[0275] - a polycarboxylate polyalkoxylated polymer comprising units of formula (I) and (II) and possibly (III) as defined above, in which p = 0 and m = 1 or 2, preferably 1,

[0276] - a polycarboxylate polyalkoxylated polymer comprising units of formula (I) and (II) as defined above, in which p = 1 and m = 0,

[0277] - a polyalkoxylated phosphonate polymer, as defined above,

[0278] - and any one of their mixtures,

[0279] preferably the water-reducing or high-water-reducing adjuvant comprises a mixture of at least two, or even three, polymers independently selected from:

[0280] - a polycarboxylate polyalkoxylated polymer comprising units of formula (I) and (II) as defined above, in which p = 0 and m = 1 or 2, preferably 1,

[0281] - a polycarboxylate polyalkoxylated polymer comprising units of formula (I) and (II) as defined above in which p = 1 and m = 0, and

[0282] - a polyalkoxylated phosphonate polymer, as defined above.

[0283] The water-reducing or high-strength water-reducing adjuvant may therefore, for example, comprise:

[0284] - a mixture of at least two polycarboxylate polyalkoxylated polymers comprising units of formulas (I) and (II) and possibly (III) as defined above, in which p = 0 and m = 1 or 2, preferably 1, or

[0285] - a mixture of at least two polycarboxylate polyalkoxylated polymers including units of formulas (I) and (II) and possibly (III) as defined above in which p = 1 and m = 0, or

[0286] - a mixture of at least two polyalkoxylated phosphonate polymers, as defined above, or

[0287] - a mixture of at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) and possibly (III) as defined above, in which p = 0 and m = 1 or 2, preferably 1, and of at least one polycarboxylate polymer polyalkoxylated comprising units of formulas (I) and (II) and possibly (III) as defined above in which p = 1 and m = 0, or

[0288] - a mixture of at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) and possibly (III) as defined above, in which p = 0 and m = 1 or 2, preferably 1, and of at least one polyalkoxylated phosphonate polymer as defined above, or

[0289] - a mixture of at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) and possibly (III) as defined above in which p = 1 and m = 0 and of at least one polyalkoxylated phosphonate polymer as defined above.

[0290] The polymers are each independently according to any one of the embodiments defined above. The polycarboxylate polyalkoxylated polymers are in particular according to any variant above corresponding, respectively, to the embodiment in which p = 1 and m = 0 or in which p = 0 and m = 1 or 2, including embodiments in which the formula units (II) are present in the form of two distinct subunits (Ilb') and (Ilb”).

[0291] Advantageously, the water-reducing or high-strength water-reducing adjuvant is selected from:

[0292] - a polycarboxylate polyalkoxylated polymer comprising units of formula (I) and (II) in which p = 0, m = letc = 0 according to any corresponding embodiment defined above,

[0293] - a mixture of at least two polycarboxylate polyalkoxylated polymers comprising units of formulas (I) and (II) in which p = 0, m = letc = 0 according to any corresponding embodiment defined above,

[0294] - a mixture of a polyalkoxylated phosphonate polymer according to any one of the embodiments defined above and at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) and wherein p = 0, m = 1 and c = 0 according to any corresponding embodiment defined above,

[0295] - a polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) and (III) in which p = 1, m = 0 and c is strictly greater than 0, according to any corresponding embodiment defined above,

[0296] - a mixture of at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) in which p = 0, m = λtc = 0 according to any corresponding embodiment defined above and at least one polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) in which units (II) are present in the form of two distinct subunits (Ilb') and (Ilb”), and

[0297] - a mixture of a first polycarboxylate polyalkoxylated polymer comprising units of formulas (I) and (II) in which p = 0, m = 1 and c = 0, of a second polyalkyl polycarboxylate polymer comprising units of formulas (I) and (II) in which p = 0, m = 1 and c = 0, and different from the first polyalkyl polycarboxylate polymer, of a third polyalkyl polycarboxylate polymer comprising units of formulas (I) and (II) and (III) in which p = 1, m = 0 and c is strictly greater than 0, according to any corresponding embodiment defined above, and of a polyalkyl phosphonate polymer according to any one of the embodiments defined above.

[0298] Preferably, the total mass content of water reducing admixture or high water reducing agent is from 0.05% to 5.0% by mass, preferably from 0.1% to 2.5% by mass, preferably from 0.3% to 1.7% by mass, relative to the mass of the hydraulic binder composition.

[0299] If the hydraulic additive composition includes several (at least two) water-reducing or high-strength water-reducing agents, the above content ranges refer to the total content of all the water-reducing or high-strength water-reducing agents. Since these contents relate to the mass of the hydraulic binder composition, they are therefore expressed relative to the dry mass of the hydraulic binder composition. Composition of hydraulic binder

[0300] A hydraulic binder composition comprises at least one compound or mixture of compounds having the property of hydrating in the presence of water and whose hydration makes it possible to obtain a solid having mechanical characteristics.

[0301] The hydraulic binder composition may include, in particular, a cement according to EN 197-1 (2012), in particular a CEM I, CEM II, CEM III, CEM IV or CEM V cement; a cement according to EN 197-5 (2021), in particular a CEM ILC / M or CEM VI cement; a cement according to EN 197-6:2023, a super-sulfated cement according to EN 15743+A1 (2015), a binder as described by EN 206+A2:2021 + FD P18-480:2022, a binder certified according to ETA / ETE (EOTA) (European certification), a binder certified by ETPM; and a binder certified by a technical opinion.

[0302] The hydraulic binder composition may therefore include one or more mineral additions. The term "mineral additions" refers to slags (as defined in EN 197-1:2012 paragraph 5.2.2 and EN 15167-1:2006), steel slags, pozzolanic materials (as defined in EN 197-1:2012 paragraph 5.2.3), fly ash (as defined in EN 197-1:2012 paragraph 5.2.4), calcined shale (as defined in EN 197-1:2012 paragraph 5.2.5), or silica fume (as defined in standard EN 197-1:2012 paragraph 5.2.7 or standard EN 197-5 paragraph 5), limestones or their mixtures.

[0303] The hydraulic binder composition may also include calcium sulfate, as defined in EN 197-1:2012 paragraph 5.4.

[0304] Preferably, the hydraulic binder composition has an amount of clinker less than or equal to 80% by mass, preferably from 0 to 80% by mass, relative to the total mass of the hydraulic binder composition.

[0305] The hydraulic binder composition therefore preferably comprises at least one mineral material other than clinker, and possibly clinker.

[0306] Preferably, the hydraulic binder composition comprises, relative to the total mass of the hydraulic binder composition, 20% to 100% by mass of a mineral material other than clinker, preferably 20% to 99.99% by mass, preferably 30% to 99% by mass, preferably 40% to 99% by mass, preferably 45% to 95% by mass, preferably 50% to 95% by mass, and preferably 60% to 90% by mass. If the hydraulic binder composition comprises several mineral materials other than clinker, these amounts correspond to the total content of mineral materials other than clinker.

[0307] When the hydraulic binder composition includes clinker, the clinker is present in a content ranging preferably from 0.01% to 80% by mass, preferably from 1% to 70% by mass, preferably from 1% to 60% by mass, preferably from 5% to 55% by mass, preferably from 5% to 50% by mass, preferably from 10% to 40% by mass, relative to the total mass of the hydraulic binder composition.

[0308] The clinker is in particular Portland or sulfoaluminate clinker, preferably Portland clinker as defined in the book "Cernent Chemistry". Harry FW Taylor. Edition, 2nd, Academy Press, 1990).

[0309] The mineral material other than clinker can be any material capable of forming part of the composition of a hydraulic binder.

[0310] Mineral materials other than clinker suitable for the present invention include, for example, calcium sulfates, mineral additions (such as calcined clays, metakaolins, limestones, natural or artificial pozzolans, silica fumes, fly ash, granulated blast furnace slags, calcined shales), crystallized, expanded, vitrified (granulated or pelletized) blast furnace slags, conversion steel slags, electric arc furnace carbon steel production slags, ladle slags, crushed shales, quartz, aluminous cements, sulfoaluminate cements, recycled glass, zeolites, diatomaceous earths, recycled concrete fines from deconstruction, and any mixture thereof.

[0311] In particular, the mineral material other than clinker is selected from calcium sulfates and mineral additions, more particularly from calcium sulfate, calcined clays, limestones, natural or artificial pozzolans, fly ash and blast furnace slags, even more particularly from calcium sulfates, calcined clays, limestones, natural or artificial pozzolans, and any mixture thereof, advantageously from calcium sulfates, calcined clays and limestones. Aggregates

[0312] The term "aggregates" refers to a collection of mineral grains with an average diameter between 0 and 125 mm. Depending on their diameter, aggregates are classified into one of the following six categories: fillers, fine sands, sands, gravels, crushed stone, and ballast (standards EN 12620 and EN 13242+A1). The most commonly used aggregates are:

[0313] - fillers, which have a diameter of less than 2 mm and for which at least 85% of the aggregates have a diameter of less than 1.25 mm and at least 70% of the aggregates have a diameter of less than 0.063 mm,

[0314] - sands with a diameter between 0 and 6.3 mm,

[0315] - bass drivers with a diameter greater than 6.3 mm,

[0316] - gravel with a diameter between 2 mm and 63 mm.

[0317] Sands are therefore included in the definition of aggregate according to the invention.

[0318] The fillers may in particular be of calcareous or dolomitic origin.

[0319] Aggregates can also be referred to as a granular mixture. Hydraulic composition with additives

[0320] Other additional additives may be used within the scope of the present invention in addition to the water-reducing or high-strength water-reducing agent(s) and the rheological agent(s). These additional additives may be selected by those skilled in the art from among the typical additives found in hydraulic binder compositions and hydraulic compositions.Examples include surfactants; carboxylic acids or their salts such as acetic, adipic, gluconic, oxalic, citric, maleic, lactic, tartaric, malonic acids and mixtures thereof; antifoaming agents; air-entraining agents; milling agents (including ethylene glycol oligomers or propylene glycol oligomers or mixtures thereof); setting retarders; hardening and setting accelerators such as glycerols, formic acid, calcium salts (e.g., calcium chloride, calcium thiocyanate, calcium nitrite, calcium formate and calcium nitrate), lithium salts, aluminum salts, magnesium salts, sodium salts; alkanolamines, and mixtures thereof; alkali or alkaline earth metal salts or aluminum salts; inorganic nanoparticles, for example the . silica or alumina nanoparticles, calcium carbonate nanoparticles, calcium hydrosilicate (HSC) nanoparticles, and mixtures thereof. Uses and methods

[0321] The invention also relates to a method for reducing the viscosity of a hydraulic composition enhanced with a water-reducing or high-water-reducing additive selected from polycarboxylate polyalkoxylated polymers and polycarboxylate polyalkoxylated polymers, this method comprising the addition of a rheological agent to said hydraulic composition enhanced with a water-reducing or high-water-reducing additive, the hydraulic composition comprising:

[0322] - a hydraulic binder composition,

[0323] - water, and

[0324] - aggregates, and

[0325] the hydraulic composition having a volume of excess water E less than or equal to 11 liters of water per cubic meter of hydraulic composition, the volume of excess water E being expressed by the relation defined above.

[0326] The viscosity is preferably the viscosity as measured by the inverted cone flow time.

[0327] This measurement is described by the standard NF PI8-469:2023 "tests for fresh concrete: flow time in the cone", with or without the step of chipping the concrete (specified for each example).

[0328] The Abrams cone is placed on the measuring table in reverse order, with its narrowest opening facing upwards and its largest opening facing upwards. It is then gradually filled with a hydraulic composition (with additives). The cone is then lifted by one operator while a second operator starts a stopwatch at the same time. The stopwatch is stopped when the cone has completely emptied. The measured time interval is interpreted as an estimate of the viscosity of the hydraulic composition (possibly with additives).

[0329] The invention also relates to the use of a rheological agent of a composition in a hydraulic composition adjuvanted with a water-reducing or high-water-reducing adjuvant selected from polycarboxylate polyalkoxylated polymers and polyalkoxylated phosphonate polymers, to decrease the viscosity of said hydraulic composition adjuvanted with a water-reducing or high-water-reducing adjuvant, the hydraulic composition comprising:

[0330] - a hydraulic binder composition,

[0331] - water, and

[0332] - aggregates, and

[0333] the hydraulic composition having a volume of excess water E less than or equal to 11 liters of water per cubic meter of hydraulic composition, the volume of excess water E being expressed by the relation defined above.

[0334] The invention also relates to the use of a combination of a rheological agent and a water-reducing agent or high water-reducing agent selected from polycarboxylate polyalkoxylated polymers and polyphosphonate polyalkoxylated polymers to decrease the viscosity of a hydraulic composition, the hydraulic composition comprising:

[0335] - a hydraulic binder composition,

[0336] - water, and

[0337] - aggregates,

[0338] the hydraulic composition having a volume of excess water E less than or equal to 11 liters of water per cubic meter of hydraulic composition, the volume of excess water E being expressed by the relation defined above.

[0339] All the embodiments described above concerning the adjuvanted hydraulic composition are applicable to the method and uses according to the invention.

[0340] The expressions "from ... to ...", "between ... and ...", "ranging from ... to ...", "varies from ... to ...", and "less than ..." should be understood inclusive of limits, unless otherwise specified.

[0341] The invention will become clearer upon reading the following non-limiting examples.

[0342] EXAMPLES

[0343] Example 1: Effect of excess water in concrete (E)

[0344] Three hydraulic compositions were tested, comprising the same hydraulic binder composition but at different concentrations (270, 280, and 320 kg / m³) while maintaining a constant water-cement ratio of 0.50, so as to vary the excess water (E) parameter in the concrete. Compositions Hy2 and Hy3 are comparative.

[0345] [Tables 1] Component Composition Hyl Composition Hy2 Composition Hy3 0 / 4 mm semi-crushed (kg / m3) 882 875 840 4 / 10 mm crushed (kg / m3) 99 80 60 10 / 20 mm rolled (kg / m3) 950 940 910 CEM II / B-LL 42.5 R (kg / m3) 270 280 320 Superplasticizer 1 (kg / m3) 4.0 4.5 1.9 Effective water (kg / m3) 135 141 160 Water / Cement Ratio 0.50 0.50 0.50 Ultimate Compaction ^max (L / m3) 888 888 888 Compaction C (tightness index of 7) 797 797 797 Air Content (L / m3) 20 21 23 Paste Volume (L / m3) 245 255 290 Paste Volume Excess (L / m3) V! 42 52 87 Binder Water Demand D (%) 31.0% 31.0% 31.0% Excess Water Volume V2 (L / m3) 51.3 54.2 60.8 Concrete Water Excess E (L / m3) 8.8 11.1 18.2 The dry extract of superplasticizer 1 is 21%, i.e. for these hydraulic compositions Hyl to Hy3, between 0.4 and 0.95 kg / m3 of active material. Superplasticizer 1 comprises the following polymers A and B, with a mass ratio A / B of 9 / 1:

[0346]

[0347] polymer A: polymer B with a = 65. b 35 and z = 53. 01 with a = 82.3, b = 17.7 and z = 53,

[0348] Determination of the dosage of rheological agent:

[0349] To determine the dosages of rheological agent to be tested on the Hyl, Hy2 and Hy3 compositions, spread tests on the paste scale of the adjuvanted hydraulic composition were carried out. For each test, a dilute solution of Diutan gum (rheological agent) was added to different dosages (dosage expressed on a dry basis, i.e., as a mass percentage relative to the mass of hydraulic binder).

[0350] The results of the spreading tests according to protocol A defined in the description are summarized in the following table (the dosages indicated in rheological agent correspond to the dosages relative to the total mass of binder):

[0351] [Tables2] Rheological agent used Spreading number Rheological agent dosage (% sec) Spreading (mm) E o / E x Diuta gum So 0.0000% 375 100% Si 0.0007% 370 99% s2 0.0014% 330 88% s3 0.0027% 310 83% s4 0.0041% 295 79%

[0352] The addition of Diutan gum reduces the measured spreading value according to its dosage; a dosage of 0.0027% implies a decrease of 17%.

[0353] For each hydraulic composition, a diluted solution of Diutan gum (rheological agent) was added to different dosages (dosage expressed in dry, therefore in mass percentage relative to the mass of hydraulic binder) and inverted cone (not pinned) measurements were carried out according to the protocol of the description above.

[0354] The slump measurement was carried out according to the protocol defined in standard EN 12350-2:2019

[0355] The results are summarized in the following table:

[0356] [Tables3] Composition Hyl Composition Hy2 Composition Hy3 Diutan Gum Dosage (% dry) Slump T 0 + 5 min (mm) Inverted Cone, Unpunched T 0 + 5 min(s) Slump T 0 + 5 min (mm) Inverted Cone, Unpunched T 0 + 5 min(s) Slump T 0 + 5 min (mm) Inverted Cone, Unpunched T 0 + 5 min(s) 0% 150 6.6 210 5.0 220 1.6 0.0007% - - 200 7.0 220 1.6 0.0014% 155 4.3 205 6.5 220 1.7 0.0027% 170 3.6 200 7.0 200 1.7 0.0041% - - - - 160 5.4

[0357] In the case of composition Hyl (according to the invention), the addition of a rheological agent reduces the inverted cone flow time without negatively impacting the initial slump of the concrete. For composition Hy2, with an excess water E close to 11 L / m³, the addition of this rheological agent (Diutan gum) slightly increases the inverted cone flow time of the concrete. Thus, for this value of E, there is no benefit in adding such a rheological agent. When this parameter E is increased to 18 L / m³, the addition of Diutan gum has no effect on viscosity, and when used in high concentrations, it has a significant negative impact on the workability of the concrete (significant decrease in slump and increase in the inverted cone flow time).

[0358] Example 2: Effect of combining a water reducer and a rheological agent on a "low carbon" hydraulic binder

[0359] The following hydraulic composition Hy4 was prepared:

[0360] [Tables4] Component Composition Hy4 0 / 4 mm semi-crushed (kg / m3) 865 4 / 10 mm crushed (kg / m3) 485 10 / 20 mm crushed (kg / m3) 560 CEM ni / A 52.5 L (kg / m3) 300 Limestone filler (kg / m3) 40 Effective water (kg / m3) 132 Superplasticizer 2 (kg / m3) 4.8 Water / Binder Ratio (CEM III / A + limestone filler) 0.39 Ultimate compactness ^max (L / m3) 862 Compactness C (tightness index of 7) 763 Air content (L / m3) 20 Paste volume (L / m3) 247 Paste excess volume (L / m3) Vi 30 Binder water demand D (%) 35.7% Excess water volume V2 (L / m3) 10.6 Excess concrete water E (L / m3) 1.2

[0361] The dry extract of superplasticizer 2 is 28.4%, i.e. for this hydraulic composition, 1.36 kg / m3 of active material.

[0362] Superplasticizer 2 comprises the following polymers A, C, D and E, with a ratio mass fraction A / C / D / E of 3 / 1 / 1.25 / 5:

[0363] polymer A: 3 $ «A m (0 - polymer C: A. O (0 R 2

[0364] with a = 49, b = 45, c = 6 and z = 17, - polymer D: L AJ _s 5 « (0 with a = 65, b = 35 and z = 53, LAd A c CK X 77 , PCX. i J | ÛK 0H 0H XHX with a = §2.3,■ b = 177 and z ~ 53, polymer E: MO OH CL. —;; -C HO GH with rFê, m=35, R = H or GHa and the

[0365] PO / EO molar ratio = 10 / 31.

[0366] To determine the dosages of rheological agent to be tested on the Hy4 composition, spread tests on the scale of the paste of the adjuvanted hydraulic composition were carried out for different types of rheological agent and at different dosages.

[0367] The results of the spreading tests according to protocol A defined in the description are summarized in the following table (the dosages indicated in rheological agent correspond to the dosages relative to the total mass of binder):

[0368] [Tables5] Rheological agent used Spreading number Rheological agent dosage (% dry) Spreading (mm) E0 / Ex High molar polycarboxylate So 0.000% 400 100% Si 0.010% 360 90% s2 0.020% 290 73% s3 0.032% 240 60% Diutan gum So 0.0000% 400 100% Si 0.0005% 375 94% s2 0.0010% 365 91% s3 0.0015% 350 88% Methyl hydroxyethyl cellulose So 0.0000% 400 100% Si 0.0025% 400 100% s2 0.0050% 390 98% s3 0.0100% 370 93% s4 0.0200% 340 85%

[0369] It is noted that, depending on the chemical nature of the rheological agent, quite different concentrations are required for the same result. These results therefore illustrate the relevance of defining the rheological agent concentration not with a value absolute, but through a measurement of its effectiveness on the spreading of the paste of the hydraulic composition, as defined by protocol A.

[0370] Various rheological agents were added to this Hy4 composition, and slump measurements using the Abrams cone and the inverted (unpitted) cone were performed. The results are summarized in the following table:

[0371] [Tableauxô] Compound Test A* Test B Test C Test D Test E Test F Test G High bulk polycarboxylate - 0.020% 0.032% - - - - Diutan gum - - - 0.0005% 0.0010% 0.0015% - Methyl hydroxyethyl cellulose - - - - - - 0.010% Sagging 5 min (mm) 230 240 230 225 220 220 230 Sagging 30 min (mm) 220 235 225 220 225 225 220 Sagging 60 min (mm) 210 220 220 205 200 200 210 Sagging 90 min (mm) 200 205 210 195 190 190 195 Slump 120 min (mm) 190 200 200 185 180 180 185 Inverted cone flow 5 min (s) 13.5 8.5 7.1 11.3 8.2 9.8 9.1 Inverted cone flow 30 min (s) 12.8 8.7 6.8 10.8 7.8 9.7 9.3 Inverted cone flow 60 min (s) 13.1 7.8 7.3 10.6 7.9 9.1 8.9 Inverted cone flow 90 min (s) 15.7 8.1 7.6 11.1 7.7 9.3 9.4 Inverted cone flow 120 min (s) 16.8 8.4 8.2 10.9 8.0 9.7 10.1

[0372] * : comparative

[0373] It is observed that the use of a high molar mass polycarboxylate (Test B) reduces the inverted cone flow time by half compared to the reference test (Test A). The addition of Diutan gum also results in this reduction of the inverted cone flow time.

[0374] Example 3: Effect of combining a water reducer and a rheological agent on a hydraulic binder comprising calcined clays

[0375] The following hydraulic compositions Hy5 (comparative) and Hy6 (according to the invention) were prepared, comprising in particular a water-reducing agent (mixture of superplasticizers C and D). Diutan gum is added to composition Hy6 only. Abrams cone and inverted cone (pitted) slump measurements were performed. The compositions and results are summarized in the following table:

[0376] [Tables7] Component Composition Hy5 Composition Hy6 0 / 2 mm crushed (kg / m3) 270 270 0 / 4 mm rolled (kg / m3) 530 530 4 / 11.2 mm crushed (kg / m3) 310 310 11.2 / 22.4 mm crushed (kg / m3) 660 660 CEM I 52.5 N (kg / m3) 180 180 Limestone filler (kg / m3) 160 160 Calcined clays (kg / m3) 60 60 Effective water (kg / m3) 168 168 Superplasticizer 3 (kg / m3) 4.4 4.4 Diutan gum (dry %) - 0.0008% Water / Binder Ratio 0.41 0.41 Ultimate compaction ^max (L / m3) 872 872 Compactness C (tightening index of 7) 763 763 Air content (L / m3) 20 18 Paste volume (L / m3) 325 323 Paste volume excess (L / m3) Vi 88.5 86.5 Water demand D of binder (%) 34.0% 34.0% Excess water volume V2 (L / m3) 32 32 Excess concrete water E (L / m3) 8.7 8.8 Slump 5 min (mm) 210 225 Slump 30 min (mm) 220 230 Slump 60 min (mm) 220 230 Slump 90 min (mm) 220 230 Inverted cone flow 5 min (s) 5.7 3.8 Inverted cone flow 30 min (s) 5.6 4.5 Inverted cone flow 60 min (s) 5.9 3.8 Inverted cone flow 90 min (s) 7.8 4.5

[0377] The dry extract of superplasticizer 3 is 28.4%, i.e. for this hydraulic composition, 1.36 kg / m3 of active material.

[0378] Superplasticizer 3 comprises the following polymers A and F, with a mass ratio A / F of 1.5 / 1: - polymer A: with a = 65, b = 35 and z = 53. polymer F: 16. bs - 41. and zs = 53 and z'f = 8..

[0379] The addition of Diutan gum reduces the concrete flow time and maintains low flow for 90 minutes.

[0380] Example 4: Synergy between the water-reducing agent and the rheological agent

[0381] The following hydraulic composition Hy7 was prepared, corresponding to the hydraulic composition Hy6 without the superplasticizers C and D. The Hy7 formula and the slump result in the Abrams cone are summarized in the following table:

[0382] [Tables8] Component Composition Hy7 0 / 2 mm crushed (kg / m3) 270 0 / 4 mm rolled (kg / m3) 530 4 / 11.2 mm crushed (kg / m3) 310 11.2 / 22.4 mm crushed (kg / m3) 660 CEM I 52.5 N (kg / m3) 180 Limestone filler (kg / m3) 160 Calcined clays (kg / m3) 60 Effective water (kg / m³) 168 Diutan gum (dry %) 0.0008% Water / Binder Ratio 0.41 Ultimate compaction ^max (L / m³) 872 Compaction C (tightness index of 7) 756 Paste volume (L / m³) 331 Paste volume excess (L / m³) Vi 94 Binder water demand D (%) 34.0% Excess water volume V2 (L / m³) 32 Concrete water excess E (L / m³) 9.1 5 min slump (mm) 20

[0383] It is observed that the hydraulic composition Hy7 hardly flows at all. The rheological agent used alone is therefore highly detrimental to the flow of the hydraulic composition. It is thus entirely surprising that the addition of this rheological agent to a hydraulic composition in combination with a water-reducing or high-strength water-reducing additive improves the flow. These results demonstrate the synergistic effect between the rheological agent and the water-reducing or high-strength water-reducing additive.

Claims

Demands

1. Adjuvanted hydraulic composition comprising: - a hydraulic composition comprising: - a hydraulic binder composition, - water, and - aggregates, - at least one water-reducing or high-water-reducing adjuvant selected from polyalkyloxylated polycarboxylate polymers and polyalkyloxylated phosphonate polymers, and any mixture thereof, and - at least one rheological agent, the hydraulic composition having an excess water volume (E) less than or equal to 11 liters of water per cubic meter of hydraulic composition, the excess water volume (E) being expressible by the following relationship: ■” J ) with: Effective water volume: the effective water volume of the hydraulic composition, expressed in liters of water per cubic meter of hydraulic composition; D: the water demand of the hydraulic binder composition, expressed in liters of water per kg of hydraulic binder composition;ruants: the mass of the hydraulic binder composition, expressed in kg of hydraulic binder composition per cubic meter of hydraulic composition; Vo: the initial volume of paste, expressed in liters per cubic meter of hydraulic composition; C: the compactness of the aggregates, expressed in liters per cubic meter of hydraulic composition; Vgranuiats: the volume of the aggregates expressed in liters per cubic meter of hydraulic composition.

2. Hydraulic composition with admixture according to claim 1, wherein the excess water volume (E) is between -10 and 10 liters per cubic meter of hydraulic composition, preferably between -10 and 9 liters per cubic meter, preferably between -10 and 8 liters per cubic meter.

3.

4.

5. Hydraulic composition with added adjuvant according to claim 1 or 2, wherein the rheological agent is selected from: - polysaccharide gums, - celluloses and cellulose ethers, - high molecular weight polycarboxylates, preferably with a molecular weight greater than 100,000 g / mol, - polyethylene glycols (PEG) and polyethylene glycols monomethyl ether (MPEG), - latexes, - polyacrylamides, - polyvinyl alcohols, - clays, - sodium alginates, and - any mixture thereof. Hydraulic composition according to any one of the preceding claims, wherein the total mass content of rheological agent is between 0.0001% and 0.1% by mass, preferably between 0.0005% and 0.08% by mass, preferably between 0.0010% and 0.06%, preferably between 0.0010% and 0.04%, relative to the mass of the hydraulic binder composition. Hydraulic composition according to any one of the preceding claims, wherein the polycarboxylate polyalkoxylated polymers comprise units of formulas (I) and (II), and optionally units of formula (III), as follows: ■^2 00 (uo in which: - “R2” and “R3” each independently represent a hydrogen or a methyl group, - "M" each independently represents H+ or a valence cation v chosen from an alkali metal cation, a cation alkaline earth metal, a divalent or trivalent metal cation, an ammonium cation or an organic ammonium cation, - when "M" represents H+, "v" represents 1, and when "M" represents a cation as defined above, "v" is the valence of the cation M, - “R7” and “R8” each independently represent a hydrogen, a methyl, or a group of the formula -COO(M)i / v with M and v as defined above, - "m" represents 0, 1 or 2, - "p" represents 0 or 1, - "X" is O or NR9, "R9" representing H, a C1-C20 alkyl group, a cycloalkyl group, or an alkylaryl group, and - "RI" represents a C1-C20 alkyl group, a cycloalkyl group, an alkylaryl group, or -[Alkyl-O]z-R6, in which the "Alkyl" in each [Alkyl-O] unit independently represents a linear or branched alkylene comprising 2 to 4 carbon atoms, and "R6" represents H, a C20 Cl alkyl group, a cyclohexyl group, or an alkylaryl group, and "z" is an integer from 2 to 250, - "a" is a number ranging from 0.05 to 0.95, "a" being the mole fraction of formula (I) units in the polymer, - "b" is a number ranging from 0.05 to 0.95, "b" being the mole fraction of formula (II) units in the polymer, - “L” represents a bonding group to the main chain of the polymer, and is in particular chosen from a direct bond, an oxygen atom, an -NR12- ​​group, R12 being a hydrogen or an alkyl group in Cl to C6, and an alkylene group in C2-C6, preferably L is an oxygen atom or an -NR12- ​​group, advantageously L is an oxygen atom, - n = 0 or 1, and if n = 1, "W" is a spacer group, in particular a Cl-C2O alkylene group possibly substituted, or a group of formula -[Alkyl-O]t- in which the "Alkyl" of each [Alkyl-O] unit independently represents an alkylene group comprising 2 to 4 carbon atoms, and "t" is an integer ranging from 1 to 500, - "RIO" each independently represents a monovalent group, in particular chosen from a hydrogen, an alkyl group in Cl at C6, and a formula group -[Alkyl-O]t-R13 in the "Alkyl" of each unit [Alkyl-O] independently represents an alkylene group of 2 to 4 carbon atoms, "t" is an integer ranging from 1 to 500 and "R13" is chosen from a hydrogen and an alkyl group in Cl at C3, or "RIO" is a cation, in particular an alkali, alkaline earth or ammonium cation; - "RI 1" is a monovalent group, in particular is chosen from a hydrogen atom, a hydroxyl group and an alkyl group in Cl at CIO, preferably "RI 1" is a hydroxyl group; and - "c" is a number ranging from 0 to 0.15, "c" being the mole fraction of formula (III) units in the polymer.

6. Hydraulic composition according to claim 5, wherein in formulas (I) and (II) of polycarboxylate polyalkoxylated polymers: - "R2" represents H, - "R3" represents independently a hydrogen or a methyl group, - "M" is H, sodium, or calcium, preferably H, - "a" is a number from 0.20 to 0.90, preferably "a" is a number from 0.40 to 0.85, - "R7" represents H, - "R8" represents independently a hydrogen or a methyl group, -X = O, - RI = -[Alkyl-O]z-R6, with preferably: - "Alkyl" represents -CH2-CH2-, -CH2-CH2-CH2-, -CH2-CH2-CH2-CH2-, -CH2-CHMe-, -CHMe-CH2-, and / or - at least 80% of the "Alkyl" group -[Alkyl-O]z- represent -CH2-CH2-, or even all the "Alkyl" of the group -[Alkyl-O]z- represent -CH2-CH2-, and / or - "z" represents an integer from 5 to 200, especially from 10 to 100, preferably from 25 to 75, and / or - "R6" represents H or Me, - either p = 0 and m = 1 or 2, preferably 1, or p = 1 and m = 0,- "b" is a number from 0.10 to 0.80, preferably "b" is a number from 0.15 to 0.60, -n = 0, - L is an oxygen atom or an -NR12- ​​group, advantageously L is an oxygen atom, - "RIO" each independently represents a hydrogen, a C1-C6 alkyl group, or "RIO" is a cation, in particular an alkali, alkaline earth or ammonium cation, preferably RIO is a hydrogen, - “RI 1” is a hydroxyl group, and - "c" is a number ranging from 0 to 0.12, preferably from 0 to 0.

10.

7. Hydraulic composition according to any one of the preceding claims, wherein the polyalkoxylated phosphonate polymers are of the following formula (IV): in which: - "R5" is a hydrogen atom or a monovalent hydrocarbon group comprising 1 to 18 carbon atoms and possibly one or more heteroatoms; - the "Ri" are similar or different from each other and represent an alkylene such as ethylene, propylene, butylene, amylene, octylene or cyclohexene, or an arylene such as styrene or methylstyrene, the "Ri" possibly containing one or more heteroatoms; - “Q” is a hydrocarbon group comprising 2 to 18 carbon atoms and possibly one or more heteroatoms; - "A" is an alkylene group consisting of 1 to 5 carbon atoms; - The "Rj" values ​​are similar or different from each other and can be chosen from: - the group A-PO3H2, A having the aforementioned meaning, - an alkyl group comprising from 1 to 18 carbon atoms and capable of bearing [R5-O(Ri-O)m] groups, R5 and Ri having the aforementioned meanings, - "m" is a number greater than or equal to 0, - "r" is the number of [R5-O(Ri-O)m] groups carried by the set of Rj, - "q" is the number of [R5-O(Ri-O)m] groups carried by Q, the sum "r+q" is between 1 and 10, - "y" is an integer between 1 and 3, - "Q", "N" and the "Rj" can together form one or more cycles, this or these cycles may also contain one or more other heteroatoms.

8. Hydraulic composition according to any one of the preceding claims, wherein the total mass content of water-reducing admixture or high water reducer is from 0.05% to 5.0% by mass, preferably from 0.1% to 2.5% by mass, preferably from 0.3% to 1.7% by mass, relative to the mass of the hydraulic binder composition.

9. Hydraulic composition according to any one of the preceding claims, wherein the hydraulic binder composition has an amount of clinker less than or equal to 80% by mass, relative to the total mass of the hydraulic binder composition, preferably from 1% to 70% by mass, preferably from 1% to 60% by mass, preferably from 5% to 55% by mass, preferably from 5% to 50% by mass, preferably from 10% to 40% by mass.

10. Method for reducing the viscosity of a hydraulic composition adjuvanted with a water-reducing or high-water-reducing adjuvant selected from polycarboxylate polyalkoxylated polymers and polyalkoxylated phosphonate polymers, comprising the addition of a rheological agent to the hydraulic composition adjuvanted with a water-reducing or high-water-reducing adjuvant, the hydraulic composition comprising: - a hydraulic binder composition, - water, and - aggregates, the hydraulic composition having an excess water volume (E) less than or equal to 11 liters of water per cubic meter of hydraulic composition, the excess water volume (E) being expressed by the relation defined in claim 1.

11. Use of a rheological agent in a hydraulic composition adjuvanted with a water-reducing or high-water-reducing adjuvant selected from polycarboxylate polyalkoxylated polymers and polyalkoxylated phosphonate polymers, to decrease the viscosity of said hydraulic composition adjuvanted with an adjuvant water reducer or high water reducer, the hydraulic composition comprising: - a hydraulic binder composition, - water, and - aggregates, the hydraulic composition having an excess water volume (E) less than or equal to 11 liters of water per cubic meter of hydraulic composition, the excess water volume (E) being expressed by the relation defined in claim 1.