Ground granulated blast furnace slag-based binder exhibiting both ettringite and stratlingite phases in the hardened state

Abstract

The present invention relates to ettringite-based and stratlingite-based binder compositions comprising a sulfate source selected from the group consisting of A) crystalline calcium aluminate cement (CAC), B) ground granulated blast furnace slag (GGBS), and C) calcium anhydrite sulfate (AC$) and / or alkali sulfate (A$).

Description

[Technical field]

[0001] The present disclosure relates to the field of hydraulic binder compositions containing ground granulated blast furnace slag (GGBS) for preparing industrial mortars and concretes. In particular, the technical field of the present invention relates to hydraulic mineral binders containing ground granulated blast furnace slag (GGBS or slag) for use in compositions capable of setting and hardening, such as mortar or concrete compositions.

[0002] The invention also relates to processes for the preparation of these hydraulic binder compositions and to processes for the preparation of these mortar or concrete compositions that are capable of setting and hardening. [Background technology]

[0003] Portland cement has historically been the main component of traditional binder compositions used in concrete or mortar formulations and is the most prevalent active ingredient.

[0004] Portland cement production has a strong negative impact on the environment, as it emits large amounts of carbon dioxide. Cement production involves the decarbonation of limestone during the firing of raw materials at very high temperatures (1450°C) in kilns, which releases CO. 2 Essentially generating (Equation (1)): CaCO 3 (s) → CaO(s) + CO 2 (g) (Formula (1))

[0005] In addition, carbon dioxide is released as a result of the burning of fossil fuels required to heat the cement kilns. Adding in the additional emissions from grinding, this amounts to almost one tonne of CO per tonne of Portland cement. 2 Overall, the cement industry is responsible for approximately 7-9% of global carbon dioxide emissions.

[0006] Furthermore, handling of Portland cement can pose health challenges (e.g., allergies), especially due to its high alkalinity (pH greater than 13). In addition, harmful elements such as hexavalent chromium (Cr(VI)) can be released during mixing, which is also unhealthy for workers when it comes into contact with the skin. Cement powders usually contain Cr(VI) reducers (as ferrous sulfate), but their effectiveness is time-limited. Construction workers, especially in the third world, are not expected to frequently check deadlines for such treatments.

[0007] Current research into new binders aims to replace cement in various applications with binders that have a lower environmental impact. One route is by using resources, such as by-products from other industries (a waste product in one industry, but a major resource in others), without expensive processing. This is the case with blast furnace slag, a by-product of the steel industry. By grinding this product into a fine powder (GGBS), a cementitious material can be obtained that can be used in partial replacement of cement or can be used alone by adding some chemical activators.

[0008] It is important to note that the use of GGBS is not only environmentally friendly, but also leads to several improved properties when used to formulate mortars, such as high resistance to sulfate attack, low permeability, good resistance in chemically aggressive environments, low heat of hydration (required in heavy structures), generally better durability, possibility of immobilizing heavy metals or radionuclides, etc.

[0009] Some typical concretes and mortars are based on a ternary system containing ordinary Portland cement, aluminous cement, and sulfates, in which ettringite forms from the very first moment until the sulfates are consumed.

[0010] In a paper by J. Bizzozero (J. Bizzozero, "Hydration and dimensional stability of calcium aluminate cement based systems", Infoscience, 2014. https: / / infoscience.epfl.ch / record / 202031), it is disclosed that in a ternary system based on GGBS, aluminous cement and sulfate, only ettringite precipitates are formed. [Prior art documents] [Non-patent literature]

[0011] [Non-Patent Document 1] J. Bizzozero, “Hydration and dimensional stability of calcium aluminate cement based systems”, Infoscience, 2014. https: / / infoscience.epfl.ch / record / 202031 Summary of the Invention [Problem to be solved by the invention]

[0012] However, in a ternary binder based on GGBS, aluminous cement and sulfate, it would be better if the hydration pattern leading to optimized final performance included the formation of both ettringite and stratlingite. Indeed, the formation of ettringite leads to early mechanical performance, while the formation of stratlingite leads to GGBS hydration leading to long-term mechanical performance and improved durability. [Means for solving the problem]

[0013] The above objectives are: A) 15% to 60% by dry weight of crystalline calcium aluminate cement (CAC); B) 15% to 70% dry weight of ground granulated blast furnace slag (GGBS) according to EN 15167; C) a sulfate source selected from the group consisting of calcium anhydrite sulfate (AC$) and / or alkali sulfate (A$); Ettringite-based and Stratlingite-based binder compositions comprising: If present, AC$ is in an amount between 5% dry mass and 15% dry mass; If present, A$ is in an amount between 2% dry mass and 4% dry mass; Ordinary Portland cement (OPC) content is 1% by dry weight or less. This is achieved with Ettringite-based and Stratlingite-based binder compositions.

[0014] The present invention also relates to dry industrial concrete or mortar compositions comprising at least one aggregate and the binder composition described above, in particular tile adhesives, repair mortars, screeds and flooring mortars.

[0015] The present invention is also directed to wet industrial mortar compositions comprising at least one aggregate, the binder composition described above, and water, in particular tile adhesives, repair mortars, screeds, and flooring mortars.

[0016] The present invention further relates to a hardened industrial concrete or mortar composition obtained from the above-mentioned wet concrete or industrial mortar composition.

[0017] Additionally, the present invention is directed to a method for preparing the above-mentioned wet industrial concrete or mortar composition, comprising a step of mixing at least one aggregate and the above-mentioned binder composition with water, wherein the binder composition is prepared from at least some of the different components of the binder composition obtained separately and / or in the form of a premix, before or in situ during the mixing step.

[0018] [Definition] In accordance with the terminology herein, the following non-limiting definitions must be considered:

[0019] "Slag" means a lithic by-product separated from metal during the smelting or refining of ores.

[0020] "GGBS" or "GGBFS": Ground granulated blast furnace slag, which is synonymous with blast furnace slag, granulated blast furnace slag (GBFS), powdered granulated blast furnace slag, and fine blast furnace slag aggregate.

[0021] "Cement" is understood to mean a powdered substance prepared for use in making mortar. It is a mineral binding material and may not contain any organic compounds.

[0022] "Binder" refers to "hydraulic binder", meaning any material that hardens simply by the addition of water, such as GGBS and cement.

[0023] "Mortar" refers to a material composed of binders, aggregates such as sand, and other ingredients such as admixtures.

[0024] "d 50 " denotes the median diameter of the granulometric distribution of the material particles (usually in micrometers for cementitious materials). It means that 50% of the particles have a diameter less than the specified number and 50% of the particles have a diameter greater than the given number. The measurement of d50 is carried out by laser diffraction analysis, also known as laser diffraction spectroscopy, using a laser diffraction analyzer, for example the "Mastersizer 2000" sold by the company MALVERN, using the wet method.

[0025] "% dry weight" and "% dry weight" mean percentage by dry weight. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 illustrates normalized heat flow of a bond composition. [Diagram 2] FIG. 1 illustrates normalized heat flow of a bond composition. [Diagram 3] FIG. 1 illustrates normalized heat flow of a bond composition. [Figure 4] 1 is an X-ray diffraction spectrum of a binder composition. [Diagram 5] 1 is an X-ray diffraction spectrum of a binder composition. [Figure 6] 1 is an X-ray diffraction spectrum of a binder composition. [Figure 7] 1 is an X-ray diffraction spectrum of a binder composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] [Ettringite-based and Stratlingite-based binder compositions] The present invention relates to A) 15% to 60% by dry weight of crystalline calcium aluminate cement (CAC); B) 15% to 70% dry mass of ground granulated blast furnace slag (GGBS); C) a sulfate source selected from the group consisting of calcium anhydrite sulfate (AC$) and / or alkali sulfate (A$); Ettringite-based and Stratlingite-based binder compositions comprising: If present, AC$ is in an amount between 5% dry mass and 15% dry mass; If present, A$ is in an amount between 2% dry mass and 4% dry mass; Ordinary Portland cement (OPC) content is 1% by dry weight or less. Ettringite-based and Stratlingite-based binder compositions.

[0028] The binder composition according to the invention, once mixed with water, is capable of forming both ettringite and stratlingite upon hardening and is therefore considered to be ettringite- and stratlingite-based, and the resulting set mortar or concrete therefore contains at least an ettringite phase and a stratlingite phase.

[0029] Ettringite is a natural mineral formed early in the hydration of cement. It originates from the coprecipitation of hydroxylated Al and Ca species. The net positive charge of the two hydroxide sites is neutralized by the adsorption of sulfate. It is in the form of positively charged pillars with sulfate and water between them. The stability of the structure is therefore ensured by strong bonds (covalent and ionic) but also by hydrogen bonds. During the hydration of Portland cement, the early formed ettringite is consumed with the formation and precipitation of CSH. In classical calcium aluminate cements (CAC) and calcium sulfoaluminate cements (CSA) based binders, ettringite remains the most important phase throughout time.

[0030] The chemical formula of stratlingite is Ca 4 Al 2 (OH) 12 [AlSi(OH) 8 ] 2 -2H 2 O. This is an AFm-type phase (with the associated anion being silicoaluminate) and is likely the hydration product of a cement binder rich in both silicate and aluminate species.

[0031] In one embodiment, in the binder composition according to the invention, the amount of CAC is between 20% dry weight and 55% dry weight, advantageously between 25% dry weight and 50% dry weight, more advantageously between 30% dry weight and 45% dry weight.

[0032] In one embodiment, in the binder composition according to the invention, the amount of GGBS is from 20% dry weight to 65% dry weight, advantageously from 25% dry weight to 60% dry weight, more advantageously from 30% dry weight to 55% dry weight.

[0033] In one embodiment, in the binder composition according to the invention, the amount of AC$ is from 0.1% dry weight to 30% dry weight, preferably from 1% dry weight to 20% dry weight, more preferably from 5% dry weight to 15% dry weight.

[0034] In one embodiment, in the binder composition according to the invention, the amount of A$ is from 0.1% dry weight to 5% dry weight, preferably from 1% dry weight to 4.5% dry weight, more preferably from 2% dry weight to 4% dry weight.

[0035] Thus, in a preferred embodiment, in the binder composition according to the invention, the amount of GGBS is from 5% dry weight to 95% dry weight, advantageously from 15% dry weight to 70% dry weight, more advantageously from 30% dry weight to 65% dry weight, the amount of CAC is from 5% dry weight to 60% dry weight, advantageously from 10% dry weight to 55% dry weight, more advantageously from 15% dry weight to 45% dry weight, the amount of AC$, if present, is from 0.1% dry weight to 30% dry weight, advantageously from 1% dry weight to 20% dry weight, more advantageously from 5% dry weight to 15% dry weight, and the amount of A$, if present, is from 0.1% dry weight to 5% dry weight, advantageously from 1% dry weight to 4.5% dry weight, more advantageously from 2% dry weight to 4% dry weight.

[0036] The binder composition according to the invention does not require any ordinary Portland cement (OPC) to be able to react with water, therefore the content of ordinary Portland cement is less than or equal to 1% by dry weight, preferably the binder composition according to the invention does not contain ordinary Portland cement.

[0037] [Component A] CAC is mainly composed of monocalcium aluminate (CaAl 2 O 4 , CaO.Al 2 O 3 ) and as minor components calcium silicate or calcium aluminate. CAC may also contain mayenite.

[0038] A suitable CAC for the ettringite and stratlingite based binder compositions according to the invention is a crystalline CAC according to NF 14647. In a preferred embodiment, the CAC is rich in monocalcium aluminate phase.

[0039] [Component B] GGBS is a vitreous granular material obtained by quenching molten slag from a blast furnace in water and then finely grinding the quenched product to improve the reactivity of GGBS. ... 2 , CaO, MgO, and Al 2 O 3 It is an amorphous aluminosilicate glass consisting essentially of. There are several glass network modifying cations (Ca, Na, Mn, etc.).

[0040] The GGBS is preferably manufactured according to the European standard [NF EN 15167-1].

[0041] [Component C] The sulfate source of the ettringite and stratlingite based binder compositions according to the invention is selected from the group consisting of calcium anhydrite sulfate, alkali sulfates, and mixtures thereof.

[0042] In a preferred embodiment, the alkali sulfate is selected from the group consisting of sodium sulfate, lithium sulfate, and potassium sulfate, preferably the alkali sulfate is sodium sulfate.

[0043] Calcium sulfate is available in three forms. In fact, calcium sulfate may be anhydrite, hemihydrate, or dihydrate. The difference lies in the water molecules bound to calcium sulfate, while anhydrite does not contain water (CaSO 4 ), and the hemihydrate contains half a molecule of water (CaSO 4 .1 / 2H 2 O), the dihydrate, also known as gypsum, contains two molecules of water (CaSO 4 .2H 2 O). According to the invention, the calcium sulfate is calcium anhydrite sulfate.

[0044] Calcium anhydrite sulfate (CaSO 4 ) exists essentially in three forms: - Soluble gypsum (AIII): hemihydrate (CaSO 4 .H 2 O) at 140 to 200 °C. - Poorly water-soluble anhydrite (AII): This is a form of natural anhydrite and can also be produced by heating the hemihydrate at 900 °C for 1 hour. The reaction of AII with water (to form gypsum) is not possible in the absence of an accelerator. - Anhydrite (AI): Obtained by heating the AII form to 1180°C. This form is formed by the synthesis of calcium oxide (CaO, or "quicklime") and sulfur dioxide (SO) at temperatures above 1450°C. 2 )

[0045] In a particular embodiment, the calcium sulfate is Micro-A anhydrite obtained by a grinding and separation process, with an average diameter D50 of 10 μm.

[0046] [Dry industrial concrete or mortar compositions] The present invention also relates to dry industrial concrete or mortar compositions comprising at least one aggregate and the above-mentioned binder composition, in particular tile adhesives, repair mortars, screeds and flooring mortars. The dry mortar compositions may finally contain other admixtures and additives.

[0047] According to the present invention, a "dry" mortar composition refers to a composition that is in the form of a powder and is ready to be mixed with water. In other words, the dry industrial concrete or mortar composition of the present invention may contain some moisture, but essentially contains solid components that are intended to be mixed with water before application.

[0048] Aggregates include a large class of particulate materials used in construction, including sand, gravel, crushed stone, slag (non-granular), recycled concrete, and geosynthetic aggregates, which act as reinforcing agents to add strength to the overall composite material.

[0049] Advantageously, said dry industrial concrete or mortar composition may also comprise, apart from aggregate, one or several optional ingredients, in particular functional admixtures, additives and fibres, which may be the same as the other optional ingredients defined above in the detailed description of the binder composition, in particular, among the additives selected from the group comprising fillers, auxiliary cementitious materials, water-reducing polymers, latexes, water retention agents, rheological agents, antifoamers / defoamers, biocides, pigments, fire retardants, air entrainers and retarders, such as the following compounds:

[0050] ·Water retention agent Water retention agents have the property of retaining the mixing water before solidifying, so that the water is trapped in the wet compound paste, thereby improving its adhesion, to some extent, less water is absorbed by the substrate.

[0051] The water retention agent is preferably selected from the group comprising modified cellulose, modified guar, modified cellulose ethers and / or guar ethers, and mixtures thereof, more preferably from the group consisting of methylcellulose, methylhydroxypropylcellulose, methylhydroxyethyl-cellulose, and mixtures thereof.

[0052] Rheological agents Possible rheological agents (also called "thickeners") are preferably selected from the group comprising, more preferably consisting of, starch ethers, cellulose ethers and / or gums (e.g., welangarchanthan, succinoglycan), modified polysaccharides (preferably among modified starch ethers), polyvinyl alcohols, polyacrylamides, sepiolite, and mixes thereof.

[0053] Defoamers / defoamers Possible antifoaming agents are preferably selected from the group comprising, more preferably consisting of, polyether polyols and mixtures thereof.

[0054] Biocides Possible biocides are preferably selected from the group comprising, more preferably consisting of, mineral oxides such as zinc oxide and mixes thereof.

[0055] Pigments Possible pigments are preferably TiO 2 , iron oxides, and mixtures thereof.

[0056] Flame retardants Flame retardants (or flame retardants) make it possible to increase the fire resistance of the composition and / or to reduce the flame propagation speed.

[0057] Air entraining agent The air entraining agent (surfactant) is advantageously selected from the group comprising, more preferably consisting of, natural resins, sulfated or sulfonated compounds, synthetic detergents, organic fatty acids, and mixes thereof, preferably from the group comprising, more preferably consisting of, lignosulfonates, basic soaps of fatty acids, and mixes thereof, more preferably from the group comprising, more preferably consisting of, olefin sulfonates, sodium lauryl sulfate, and mixes thereof.

[0058] Retardant The retarding agent is advantageously selected from the group comprising, more preferably consisting of, tartaric acid and its salts (sodium or potassium salts), citric acid and its salts (sodium (trisodium citrate)), and mixtures thereof.

[0059] In addition, other ingredients may be: Plasticizers ·fiber Dispersants Wetting agent Polymer resin Complexing agents Polyol-based drying shrinkage reducing agent

[0060] The total content of these optional other components in the dry mortar composition is preferably comprised between 0.1% and 30% by dry weight, advantageously between 1% and 20% by dry weight, and more advantageously between 3% and 10% by dry weight of the total weight of the binder composition.

[0061] [Wet industrial concrete or mortar compositions] The present invention also refers to wet industrial concrete or mortar compositions comprising at least one aggregate, the binder composition described above and water, in particular tile adhesives, repair mortars, screeds and flooring mortars.

[0062] In one particular embodiment, in the wet industrial concrete or mortar composition according to the invention, the water / binder composition mass ratio is between 0.1 and 1.2, advantageously between 0.2 and 1, and more advantageously between 0.3 and 0.8.

[0063] [Method for preparing a wet industrial concrete or mortar composition] The present invention also relates to a method for preparing a wet industrial concrete or mortar composition as defined above, comprising a step of mixing at least one aggregate and the binder composition as defined above with water, the binder composition being prepared before the mixing step or in situ during the mixing step from at least some of the different components of the binder composition obtained separately and / or in the form of a premix.

[0064] In other words, wet industrial concrete or mortar compositions can be prepared by two separate methods.

[0065] In the first method, the binder composition is prepared and then mixed with at least one aggregate, after which the dry industrial concrete or mortar composition is mixed with water.

[0066] In the second method, a wet industrial concrete or mortar composition is prepared by mixing the components of the binder composition with aggregate in water.

[0067] According to the present disclosure, the term "mixing" should be understood as any form of mixing.

[0068] In a preferred embodiment, a portion of the binder composition and at least a portion of the water are mixed together prior to mixing with the aggregate.

[0069] In a preferred embodiment, the process is carried out in such a way that the ratio of water to binder composition is comprised between 0.1 and 1.2, advantageously between 0.2 and 1, and more advantageously between 0.3 and 0.8.

[0070] [Hardened industrial mortar composition] The present invention also refers to a hardened industrial concrete or mortar composition obtained from the above wet mortar composition.

[0071] [Example] Example 1: Effect of sulfate source Three binder compositions were prepared. The three binder compositions contained 50% by dry weight of GGBS, 35% by dry weight of CAC, and 15% by dry weight of a sulfate source, one containing calcium anhydrite sulfate, one containing calcium hemihydrate sulfate, and one containing calcium dihydrate sulfate. These three binder compositions were then mixed with water at a water / binder composition weight ratio of 0.6. The hydration rates of the three binder compositions were measured using isothermal calorimetry. In FIG. 1, it can be seen that the binder composition containing calcium anhydrite sulfate exhibits a much higher and faster hydration rate compared to the other two binder compositions. This was unexpected as calcium anhydrite sulfate exhibits a much higher hydration rate than the hemihydrate and dihydrate.

[0072] Example 2: Effect of sulfate ratio Four binder compositions were prepared, as shown in Table 1 below.

[0073] [Table 1]

[0074] These four binder compositions were then mixed with water in a water / binder composition mass ratio of 0.6. These amounts were specified to maintain the same GGBS / CAC ratio, regardless of the anhydrite ratio. Isothermal calorimetry was used to measure the heat flow of these four samples. From Figure 2 it can be seen that B1 shows a peak at around 5 hours. With 5% dry weight anhydrite calcium sulfate present, the peak is delayed until around 19 hours. With 10% dry weight anhydrite calcium sulfate present, the peak is delayed until around 8 hours. Conversely, with 15% dry weight anhydrite calcium sulfate present, it is possible to shorten the time and the peak is around 4 hours, which was unexpected.

[0075] Example 3: Hydration with Sodium Sulfate Five binder compositions were prepared, as shown in Table 2 below.

[0076] [Table 2]

[0077] These five binder compositions were then mixed with water in a water / binder composition weight ratio of 0.6. These amounts were specified to maintain the same GGBS / CAC ratio, regardless of the sodium sulfate ratio. Isothermal calorimetry was used to measure the hydration rate of the five binder compositions. In FIG. 3, it can be seen that B1 shows a peak at around 5 hours. With 1% dry weight sodium sulfate present, the peak is delayed until around 10 hours. With 2% dry weight sodium sulfate present, the peak is delayed until around 8 hours. Conversely, with 3% or 5% dry weight sodium sulfate present, it is possible to shorten the time, with the peak occurring at around 3 hours and 30 minutes, which was unexpected.

[0078] Example 4: Evidence for the presence of both ettringite and stratlingite Four bond compositions according to the present invention were prepared, as shown in Table 3 below.

[0079] [Table 3]

[0080] These four binders were then mixed with water in a water / binder composition weight ratio of 0.6.

[0081] After 3 and 7 days, the hardened products obtained from B9 were analyzed by X-ray diffraction. As can be seen in Figure 4, both stratlingite (s) and ettringite (E) formed.

[0082] After 7 days, the hardened product obtained from B10 was analyzed by X-ray diffraction. As can be seen in Figure 5, both stratlingite (s) and ettringite (E) formed.

[0083] After 3 and 7 days, the hardened products obtained from B11 were analyzed by X-ray diffraction. As can be seen in Figure 6, both stratlingite (s) and ettringite (E) formed.

[0084] After 1, 7 and 14 days, the hardened products obtained from B12 were analyzed by X-ray diffraction. As can be seen in Figure 7, only stratlingite formed.

[0085] Furthermore, it can be noted from Figures 4, 5 and 6 that the stratlingite phase appears at an early stage, indicating the reactivity of GGBS.

[0086] Example 5: Fast-curing tile adhesive based on B10 A tile adhesive was prepared by mixing sand, binder composition B10, and other ingredients as shown in Table 4 below, and mixing with 24% by weight water.

[0087] [Table 4]

[0088] The adhesive strength was measured according to standard EN 12004 for fast curing tile adhesives. Tests were performed after 6 hours, 7 days, 14 days and 28 days and the results are shown in Table 5 below.

[0089] [Table 5]

[0090] The tile adhesive according to the invention is a fast-setting tile adhesive according to standard EN12004, since it exhibits an adhesive strength of 0.5 MPa after 6 hours and of more than 1 after 28 days. It can be noted that it passes the threshold of 1 MPa after 7 days.

[0091] (Example 6: Self-leveling underlayment based on B10) A self-leveling underlayment was prepared by mixing sand, Binder Composition B10, and other ingredients as shown in Table 6 below, and mixing with 22% by weight water.

[0092] [Table 6]

[0093] The compressive strength was measured according to standard EN 13813 after 7, 14 and 28 days, the results being shown in Table 7 below.

[0094] [Table 7]

[0095] The self-levelling underlayment according to the invention exhibits the compressive strength of a self-levelling underlayment according to standard EN 13813.

Claims

1. A) crystalline calcium aluminate cement (CAC) having a dry weight percentage of 15% or more and 60% or less; B) 15% by dry mass or more and 70% by dry mass or less of ground granulated blast furnace slag (GGBS); C) a sulfate source selected from the group consisting of calcium anhydrite sulfate (AC$) and / or alkali sulfate (A$); Ettringite-based and Stratlingite-based binder compositions comprising: If present, AC$ is in an amount greater than or equal to 5% dry weight and less than or equal to 15% dry weight; if present, A$ is in an amount greater than or equal to 2% dry weight and less than or equal to 4% dry weight; The content of ordinary Portland cement (OPC) is 1% by dry mass or less. Ettringite- and Stratlingite-based binder compositions.

2. 2. Ettringite and stratlingite based binder compositions according to claim 1, wherein the amount of CAC is ≧20% dry weight and ≦55% dry weight, preferably ≧25% dry weight and ≦50% dry weight, more preferably ≧30% dry weight and ≦45% dry weight.

3. 3. Ettringite and stratlingite based binder compositions according to claim 1 or 2, wherein the amount of GGBS is ≧20% dry weight and ≦65% dry weight, preferably ≧25% dry weight and ≦60% dry weight, more preferably ≧30% dry weight and ≦55% dry weight.

4. 4. Ettringite and stratlingite based binder compositions according to any one of claims 1 to 3, wherein the amount of AC$ is ≧0.1% dry weight and ≦30% dry weight, preferably ≧1% dry weight and ≦20% dry weight, more preferably ≧5% dry weight and ≦15% dry weight.

5. 5. Ettringite and stratlingite based binder compositions according to any one of claims 1 to 4, wherein the amount of A$ is ≧0.1% dry weight and ≦5% dry weight, preferably ≧1% dry weight and ≦4.5% dry weight, more preferably ≧2% dry weight and ≦4% dry weight.

6. Ettringite and stratlingite type binder compositions according to claim 5 or 6, wherein the alkali sulfate is selected from the group consisting of sodium sulfate, lithium sulfate and potassium sulfate, preferably the alkali sulfate is sodium sulfate.

7. 7. Ettringite and stratlingite system binder compositions according to any one of claims 1 to 6, further comprising at least one additive selected from the group comprising water reducing polymers, fillers, auxiliary cementitious materials, water retention agents, rheological agents, antifoam / defoamers, biocides, pigments, flame retardants, air entrainers, and retarders.

8. 9. A dry industrial mortar or concrete composition comprising at least one aggregate and a binder composition according to any one of claims 1 to 8, in particular a tile adhesive, a repair mortar, a screed and a flooring mortar.

9. 9. A wet industrial mortar or concrete composition comprising at least one aggregate, a binder composition according to any one of claims 1 to 8, and water, in particular a tile adhesive, a repair mortar, a screed, and a flooring mortar.

10. A hardened industrial mortar or concrete composition obtained from the wet industrial mortar or concrete composition of claim 10.

11. 11. A method for preparing a wet industrial mortar or concrete composition according to claim 10, comprising a step of mixing at least one aggregate and a binder composition according to any one of claims 1 to 8 with water, said binder composition being prepared before or in situ during the mixing step from at least some of the different components of said binder composition obtained separately and / or in the form of a premix.

12. 13. The method according to claim 12, wherein the ratio of water to binder composition is comprised between ≧0.1 and ≦1.2, advantageously between ≧0.2 and ≦1, more advantageously between ≧0.3 and ≦0.8.

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