Tile adhesive based on blast furnace slag fine powder (GGBFS)

Abstract

The present invention relates to a tile adhesive composition comprising at least one aggregate and a hydraulic binder formulation, wherein the hydraulic binder formulation comprises: - ground granulated blast furnace slag (GGBS), - more than 5% by mass, preferably at most 30% by mass of calcium sulphate, - at most 5% by mass of ordinary Portland cement (OPC), - at most 10% by mass of an alite-containing cement, an alite-containing clinker, calcium aluminate cement (CAC), or a mixture thereof, - at least one complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), preferably from the group consisting of CMC and GA, and - at least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic binder compositions containing ground granulated blast-furnace slag (GGBS or slag) for preparing industrial mortars. In particular, the technical field of the present invention relates to hydraulic mineral binders containing ground granulated blast-furnace slag used in compositions that can set and harden, such as mortar compositions.

[0002] The present invention also relates to these hydraulic binder compositions and to methods for producing these mortar compositions that can set and harden.

Background Art

[0003] The production of Portland cement has a strong negative impact on the environment due to the emission of large amounts of carbon dioxide. Cement production essentially generates CO2 through the decarbonation of limestone during the firing of raw materials at very high temperatures (1450 °C) in a kiln (Equation (1)): CaCO3(s) → CaO(s) + CO2(g) (Equation (1))

[0004] Furthermore, carbon dioxide is emitted as a result of the combustion of fossil fuels required to heat the cement kiln. Adding additional emissions from grinding, approximately 1 ton of CO2 is obtained per ton of Portland cement. Overall, the cement industry is responsible for approximately 7 - 9% of the world's carbon dioxide emissions.

[0005] Also, the handling of Portland cement can cause health problems (such as allergies), especially due to its high alkalinity (pH higher than 13). In addition, harmful components such as hexavalent chromium (Cr(VI)) may be released during mixing, which is also harmful when it comes into contact with the skin of workers. Usually, cement powder contains a Cr(VI) reducing agent (such as ferrous sulfate), but its efficacy is limited in time. It cannot be expected that construction workers, especially those in the third world, will frequently check the expiration dates related to such treatments.

[0006] Recent research on new binders aims to replace cement with binders that have less environmental impact in various applications. One means is to use resources such as by-products of other industries (which are waste in one industry but primary resources in another) without costly treatment. This applies to blast furnace slag, a by-product of the iron industry. By grinding this product into a fine powder (GGBS), a cementitious material can be obtained that can be used as a partial substitute for cement or used alone by adding certain chemical activators.

[0007] It is important to note that the use of GGBS is not only environmentally friendly but also provides several enhanced properties when used to prepare mortar, such as high resistance to sulfate attack, low water permeability, good resistance in chemically aggressive environments, low heat of hydration (required for large structures), generally excellent durability, and the potential for immobilization of heavy metals or radionuclides.

[0008] However, in contrast to Portland cement, cement based on GGBS requires an alkaline activator to form hardened mortar. Unfortunately, these alkaline activators are irritating to users. Some efforts have been made to limit the amount of alkaline activator required. For example, U.S. Patent No. 8,932,402 discloses a hydraulic binder composition in which the alkaline activator (base) is in an amount of 1% by mass or less. Despite the benefit of this reduced amount of alkaline activator, the mechanical properties of the resulting mortar could be improved.

[0009] Generally, calcium sulfate is used to accelerate the hardening of cement based on GGBS. However, high sulfate cement with a high content of GGBS and more than 5% by mass of calcium sulfate undergoes rapid carbonation even at atmospheric concentrations in the presence of carbon dioxide, causing a decrease in flexural strength.

[0010] Organic polymers such as cellulose ethers, latexes, flame retardants, water reducers, and anti-shrinkage agents are generally used to change the rheological state of mortar and improve its long-term mechanical and durability performance.

[0011] Certain organic polymers such as cellulose ethers and latexes are essential components of some industrial mortars, such as tile adhesives, repairs, etc. Unfortunately, in binder compositions rich in GGBS containing an alkali activation / cation-rich activation system, most polymers such as cellulose ethers and latexes are not resistant to alkaline / cationic environments and their effects are strongly affected.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0013] In this regard, the present invention aims to address at least one of the above problems and / or needs by addressing at least one of the following objectives: -O1- To provide a binder based on GGBS or a mortar composition containing the binder based on GGBS, which is an attractive alternative to compositions based on ordinary Portland cement (OPC). -O2- To provide an environmentally friendly mortar composition containing a binder based on slag or the binder based on GGBS. -O3- To provide a mortar composition containing a binder based on slag or the binder based on GGBS, which is more acceptable than compositions based on OPC with respect to health and safety issues. -O4- To provide a mortar composition containing a binder based on slag or a binder based on said GGBS, which has the ability to be produced by several methods such as vibro-compaction, spraying, trowelling, casting, etc., and which results in dry mortar and wet mortar formulations suitable for production. -O5- To provide a mortar composition containing a binder based on slag or a binder based on said GGBS, which results in a wet formulation having appropriate rheological properties, i.e., a stable rheology (good workability) during the normal setting time (e.g., several minutes to several hours) required by the user of the wet formulation. -O6- To provide a mortar composition containing a binder based on slag or a binder based on said GGBS, which results in a cured material having the required mechanical properties, especially an acceptable initial strength (e.g., 24 hours). -O7- To provide a mortar composition containing a binder based on slag or a binder based on said GGBS, which results in a cured material having the required durability. -O8- To provide a mortar composition containing a binder based on slag or a binder based on said GGBS, which results in a cured material having the normally required setting time (e.g., several minutes to several hours). -O9- To provide a simple and inexpensive method for preparing a mortar composition containing a binder based on GGBS or a binder based on said GGBS that complies with at least one of the objectives -O1- to -O8-. -O10- To provide a simple and inexpensive method for preparing a mortar composition containing a binder based on wet form slag or a binder based on said GGBS. -O11- To provide a cured product for the construction industry containing GGBS as the main component of a hydraulic binder. -O12- To propose a strength enhancer admixture to improve the hydration of sulfate cement.

Means for Solving the Problems

[0014] The above object is achieved by a tile adhesive composition comprising at least one aggregate and a hydraulic binder formulation, wherein the hydraulic binder formulation comprises: · Ground granulated blast-furnace slag (GGBS), · More than 5% by mass, preferably at most 30% by mass, of calcium sulfate, · At most 5% by mass of ordinary Portland cement (OPC), · At most 10% by mass of ye’elimite-containing cement, ye’elimite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof, · At least one complexing and thickening polymer selected from the group consisting of cellulose methyl carboxylate (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), and · At least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer is achieved by a tile adhesive composition.

[0015] The present invention also relates to a dry mortar composition comprising the above tile adhesive composition.

[0016] The present invention also relates to a wet mortar composition comprising the above tile adhesive composition.

[0017] The present invention further relates to a cured mortar obtained from the above wet mortar composition.

[0018] The present invention further relates to a method for preparing the above wet mortar composition, comprising the step of mixing the above tile adhesive composition with water, wherein the tile adhesive composition is prepared from at least some of the different components of the tile adhesive composition obtained individually and / or in the form of a premix, either before or during the mixing step.

[0019] The present invention also relates to a method for improving the hydration of sulfate cement, wherein the sulfate cement comprises: · ground granulated blast furnace slag (GGBS), · more than 5% by mass, preferably at most 30% by mass of calcium sulfate, · at most 5% by mass of ordinary Portland cement (OPC), · at most 10% by mass of alite-containing cement, alite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof and the method comprises the following steps: S1: preparing the following components: · ground granulated blast furnace slag (GGBS), · calcium sulfate, · ordinary Portland cement (OPC), · alite-containing cement, alite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof ; S2: preparing at least one strength-enhancing admixture which is a complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), preferably selected from the group consisting of CMC and GA, and S3: preparing at least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer, S4: mixing the components with water . The present invention also relates to such a method.

Embodiments for Carrying Out the Invention

[0020] <Definitions> According to the terminology used in this specification, the following non-limiting definitions must be considered:

[0021] "Slag" means a stone-like by-product separated from metal during the smelting or refining of ore.

[0022] "GGBS" or "GGBFS": Ground granulated blast-furnace slag, which is equivalent to blast furnace slag, granulated blast furnace slag (GBFS), granulated molten blast furnace slag powder, and finely ground blast furnace slag aggregate.

[0023] It is understood that "clinker" and "cement" mean powdery substances made for use in making mortar, which are mineral binders that probably contain no organic compounds.

[0024] "Binder" refers to "hydraulic binder", which means any substance such as GGBS and cement that hardens simply by adding water.

[0025] "Mortar" refers to a material composed of a binder, aggregates such as sand, and other components such as admixtures.

[0026] "d 50 " indicates the median diameter (usually in micrometers for cementitious materials) of the particle size analysis distribution of the particles of a substance, meaning that 50% by mass of the particles have a diameter smaller than a specified number and 50% by mass of the particles have a diameter larger than a given number. The measurement of d 50 is carried out by wet method by laser diffraction analysis using a laser diffraction analyzer such as "Mastersizer 2000" commercially available from MALVERN.

[0027] "Water retention agent" is a compound having the property of retaining mixing water before setting. Water is trapped in the wet mixture paste to improve its bonding. To some extent, less water is absorbed by the support.

[0028] "Thickening agent" means a compound that can increase the viscosity of a composition.

[0029] "Less than or equal to X" without any lower limit indicated means that both "X" and "0" are included within the range.

[0030] "A to B" means that both A and B are included within the range.

[0031] <Detailed Description> As described above, the present invention relates to a tile adhesive composition containing at least one aggregate and a hydraulic binder formulation, and the hydraulic binder formulation comprises: · Ground granulated blast-furnace slag (GGBS), · More than 5% by mass, preferably at most 30% by mass of calcium sulfate, · Ordinary Portland cement (OPC) of 5% by mass or less, · Cement containing ferrite, ferrite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof, of 10% by mass or less, · At least one complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), and · At least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer is included.

[0032] <Ground granulated blast-furnace slag (GGBS)> In some embodiments, the amount of GGBS is 55% to 95% by mass, preferably 65% to 95% by mass, more preferably 75% to 95% by mass.

[0033] In a preferred embodiment, at least a part of the GGBS is ultra-fine GGBS. The ultra-fine GGBS has a d of 6000 to 8500 g / cm 2 , preferably 6500 to 8250 g / cm 2 , more preferably 7000 to 8000 g / cm 2 of 50They are GGBS particles having [the relevant property]. In this advantageous embodiment, the hydraulic binder composition according to the invention contains GGBS, and 1% to 50% by mass, preferably 5% to 35% by mass, more preferably 12% to 24% by mass of the GGBS is ultrafine GGBS.

[0034] This proportion of ultrafine GGBS leads to an improvement in the resistance of the resulting hardened mortar to water immersion when compared to the mortar according to the invention that does not contain ultrafine GGBS.

[0035] <Calcium sulfate> The hydraulic binder composition according to the invention contains more than 5% by mass, preferably at most 30% by mass of calcium sulfate.

[0036] Calcium sulfate can be anhydrous calcium sulfate, hemihydrate calcium sulfate, dihydrate calcium sulfate, or a mixture thereof. Advantageously, the amount of calcium sulfate is 5% to 30% by mass, preferably 5% to 25% by mass, more preferably 5% to 20% by mass.

[0037] <Ordinary Portland cement (OPC)> According to the invention, the hydraulic binder can contain 5% by mass or less, preferably 0% to 2.5% by mass or less, more preferably 0% to 0.5% by mass or less of OPC.

[0038] In this disclosure, OPC means any OPC compliant with the standard EN 197-1.

[0039] <Elimite-containing cement, elinite-containing clinker, calcium aluminate cement (CAC) and calcium aluminate clinker>

[0040] Advantageously, in the hydraulic binder composition, the total amount of elinite-containing cement, elinite-containing clinker and CAC is 0% to 10% by mass, preferably 0.5% to 5% by mass, more preferably 2.5% to 5% by mass.

[0041] The presence of yeelimite-containing cement, yeelimite-containing clinker, and / or CAC enables an increase in the initial strength of the resulting hardened mortar within 24 hours.

[0042] The yeelimite-containing cement can be sulfoaluminate cement (CSA).

[0043] In an advantageous embodiment, the hydraulic binder composition comprises 10% to 80% by mass of CSA, preferably 30% to 70% by mass of CSA, more preferably 40% to 60% by mass of CSA.

[0044] CAC can be selected from the group comprising monocalcium aluminate (CA) and / or mayenite (C 12 A7).

[0045] <Complexing and thickening polymer> According to the present invention, the hydraulic binder composition comprises at least one complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, and locust bean gum. In a preferred embodiment, the complexing and thickening polymer is selected from the group comprising CMC and GA.

[0046] Advantageously, the amount of the organic complexing and thickening agent is 0% to 1.0% by mass, preferably 0.1% to 0.5% by mass, more preferably 0.2% to 0.4% by mass.

[0047] <Rheology modifier> The hydraulic binder composition according to the present invention comprises at least one rheology modifier.

[0048] The rheology modifier can be selected from methylcellulose (MC), methylhydroxyethyl cellulose (MHEC), methylhydroxypropyl cellulose (MHPC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), and ethylhydroxyethyl cellulose (EHEC).

[0049] In a preferred embodiment, the amount of the rheology modifier is from 0% to 1.0% by mass, preferably from 0.1% to 0.5% by mass, and more preferably from 0.2% to 0.4% by mass.

[0050] <Aggregate> The aggregate includes various particulate materials used in construction, including sand, gravel, crushed stone, slag (non-granular), recycled concrete, and geosynthetic aggregates, and functions as a reinforcing material that adds strength to the entire composite material.

[0051] <Dry mortar composition> The present invention also relates to a dry mortar composition containing the above tile adhesive composition. The dry mortar composition may ultimately contain other admixtures and additives.

[0052] According to the present invention, the "dry" mortar composition means a composition in the form of a powder that can be immediately mixed with water. In other words, the dry mortar composition of the present invention may contain some moisture, but essentially contains solid components that are intended to be mixed with water before use.

[0053] Advantageously, the dry mortar composition can also contain, separately from the aggregate, one or several components, in particular functional admixtures, additives, and fibers. In particular, these components are selected from additives including fillers such as the following compounds, additional cementitious materials, water-reducing polymers, latexes, water retention agents, rheology agents, defoaming agents / anti-foaming agents, biocides, pigments, flame retardants, air entraining agents, and setting retarders:

[0054] · Defoaming agent / anti-foaming agent Possible defoamers preferably include, more preferably are selected from the group consisting of polyether polyols and mixtures thereof.

[0055] · Biocide Possible biocides preferably include, more preferably are selected from the group consisting of inorganic oxides such as zinc oxide and mixtures thereof.

[0056] · Pigment Possible pigments preferably include, more preferably are selected from the group consisting of TiO2, iron oxide and mixtures thereof.

[0057] · Flame retardant The flame retardant (or fire retardant) enables to increase the fire resistance of the composition and / or slow down the rate at which the flame spreads.

[0058] · Air entraining agent The air entraining agent (surfactant) preferably includes, more preferably is selected from the group consisting of natural resins, sulfated or sulfonated oxidized compounds, synthetic detergents, organic fatty acids and mixtures thereof, more preferably includes, more preferably is selected from the group consisting of lignosulfonates, basic salts of fatty acids and mixtures thereof, more preferably includes, more preferably is selected from the group consisting of olefin sulfonates, sodium lauryl sulfate and mixtures thereof.

[0059] · Setting retarder The setting retarder preferably includes, more preferably is selected from the group consisting of tartaric acid and its salts: sodium or potassium salts, citric acid and its salts: sodium (trisodium citrate) and mixtures thereof.

[0060] Furthermore, other components are: · Plasticizer · Fiber · Dispersion powder · Wetting agent · Polymeric resin · Complexing agent · Polyol-based drying shrinkage reducing agent It may be.

[0061] The total content of any of these other components in the dry mortar composition is preferably 0% to 5% by mass, advantageously 0.2% to 2% by mass, more advantageously 0.5% to 1% by mass of the total mass of the binder composition.

[0062] <Wet mortar composition> The present invention also relates to a wet mortar composition comprising the above tile adhesive composition and water.

[0063] In certain embodiments, the mass ratio of water / hydraulic binder composition in the wet mortar composition according to the present invention is 0.30 to 0.63, advantageously 0.34 to 0.48, more advantageously 0.38 to 0.42.

[0064] <Method for preparing a wet mortar composition> The present invention also relates to a method for preparing the above wet mortar composition, comprising the step of mixing at least the above tile adhesive composition with water, wherein the tile adhesive composition is prepared from at least some of the different components of the binder composition obtained individually and / or in the form of a premix before or during the mixing step.

[0065] In other words, the wet mortar composition can be prepared by two different methods.

[0066] In the first method, a tile adhesive composition is prepared. The dry mortar composition is then mixed with water.

[0067] In the second method, the wet mortar composition is prepared by mixing each component of the tile adhesive composition in water.

[0068] According to the present disclosure, the term "mixing" should be understood as any form of mixing.

[0069] In a preferred embodiment, a part of the binder composition and at least a part of the water are mixed together prior to mixing with the aggregate.

[0070] <Hardened industrial mortar composition> The present invention also relates to a hardened mortar composition obtained from the wet mortar composition described above.

[0071] <Method for improving the hydration of sulfate cement> As described above, the present invention is a method for improving the hydration of sulfate cement, wherein the sulfate cement is: · Ground granulated blast furnace slag (GGBS), · More than 5% by mass, preferably at most 30% by mass of calcium sulfate, · Ordinary Portland cement (OPC) of 5% by mass or less, · Cement containing ettringite, ettringite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof of 10% by mass or less and the method comprises the following steps: S1: The following components: · Ground granulated blast furnace slag (GGBS), · Calcium sulfate, · Ordinary Portland cement (OPC), · Cement containing ettringite, ettringite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof are prepared; S2: Preparing at least one strength-enhancing admixture which is a complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), preferably selected from the group consisting of CMC and GA, and S3: Preparing at least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer. S4: Step of mixing the components with water The present invention also relates to a method comprising the same.

[0072] The components prepared in steps S1, S2 and S3 can be blended in situ before or during the mixing step S4, and the components can be obtained individually and / or in the form of a premix.

[0073] In other words, the method can be carried out in two different processes.

[0074] In the first process, the components prepared in steps S1, S2 and S3 are blended together and then mixed with water in step S4.

[0075] In the second process, the components prepared in steps S1, S2 and S3 are introduced one by one into water or in the form of some premixes of the components, and then the mixing step S4 is carried out.

Example

[0076] (Example 1) Tile adhesive composition containing a hydraulic binder according to the present invention The hydraulic binder composition is prepared by mixing GGBS, calcium sulfate, OPC, CSA having a Blaine of 5000±250 cm 2 / g, cellulose ether UP1560 sold by Ashland® which contains more than 55% alite and less than 10% belite, and CMC in the proportions listed in Table 1 below. The proportions total 47.48% of the dry mixture.

[0077]

Table 1

[0078] This hydraulic binder composition is mixed with 2.5% by mass of Vinnapas 7220, which is a latex sold by Wacker®, and 50.02% by mass of sand to obtain a dry tile adhesive composition according to the present invention.

[0079] This dry tile adhesive composition is then mixed with 19% by mass of water as compared to the total mass of the dry tile adhesive composition to obtain a wet tile adhesive composition according to the present invention.

[0080] The initial consistency of the wet tile adhesive composition according to the present invention is 431 Pa·s. The adhesive strength of the cured tile adhesive conforms to type C2TE and meets the standard EN12004 as shown in Table 2 below, which shows the measured values of three samples of the cured tile adhesive composition taken at 24 hours, 7 days, 14 days, and 28 days to examine the development of strength during storage at (20 ± 2)°C and (50 ± 5)% relative humidity.

[0081]

Table 2

[0082] Open time T 20min and T 30min are defined as "the maximum interval after tile adhesive application such that the tile can be embedded in the applied adhesive and meets the specified tensile adhesive strength requirements". To evaluate the open time, after preparation of the test unit, five tiles are placed on fresh adhesive at 20 and 30 minutes respectively after T 0min and a mass of 20 N is applied over 30 s.

[0083] After drying for 7 days under drying conditions of (20 ± 2)°C and (50 ± 5)% relative humidity, the test unit is immersed in water at standard temperature. After 20 days, the test unit is taken out of the water, wiped with a cloth, and the pull head plate is bonded to the tile. After a further 24 hours required for drying of the adhesive, the test unit is immersed in water. On the 28th day, the test unit is taken out of the water and immediately peeled off with a tensile testing machine for WATER measurement.

[0084] After drying for 14 days under the conditions of (20±2)°C and (55±5)% relative humidity, the test unit is further placed in an air-circulating oven at (70±3)°C for 14 days. Then, it is taken out of the oven, the pull head plate is bonded to the tile, and it is further placed under standard conditions for 24 hours required for the drying of the adhesive. On the 28th day, the test unit is peeled off with a tensile testing machine for heat (HEAT) measurement.

[0085] (Example 2) The hydraulic binder composition is prepared by mixing GGBS, calcium sulfate, OPC, CSA having a Blaine of 5000±250 cm 2 / g, more than 55% alite and less than 10% belite, UP1560, a cellulose ether sold by Ashland (registered trademark), and GA in the proportions listed in Table 3 below:

[0086]

Table 3

[0087] This hydraulic binder composition is mixed with 2.5% by mass of Vinnapas 7220, a latex sold by Wacker (registered trademark), and 50.02% by mass of sand to obtain a dry tile adhesive composition according to the present invention.

[0088] This dry tile adhesive composition is then mixed with 19% by mass of water compared to the total mass of the dry tile adhesive composition to obtain a wet tile adhesive composition according to the present invention.

[0089] The initial consistency of the wet tile adhesive composition according to the present invention is 367 Pa·s. The adhesive strength of the cured tile adhesive meets the C2TE type and complies with the standard EN12004 as shown in Table 4 below, which shows the measured values of three samples of the cured tile adhesive composition taken at 24 hours, 7 days, 14 days, and 28 days to examine the development of strength during storage at (20±2)°C and (50±5)% relative humidity.

[0090]

Table 4

Claims

1. A tile adhesive composition comprising at least one aggregate and a hydraulic binder formulation, wherein the hydraulic binder formulation comprises: - Granulated blast furnace slag fine powder (GGBS), - More than 5% by mass, preferably at most 30% by mass of calcium sulfate, - At most 5% by mass of ordinary Portland cement (OPC), - At most 10% by mass of alite-containing cement, alite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof, - At least one complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), preferably from the group consisting of CMC and GA, and - At least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer A tile adhesive composition comprising.

2. The tile adhesive composition according to claim 1, wherein the complexing and thickening polymer is selected from the group consisting of CMC and GA.

3. The tile adhesive composition according to claim 1 or 2, wherein the amount of GGBS is 55% to 95% by mass, preferably 65% to 95% by mass, more preferably 75% to 95% by mass.

4. The tile adhesive composition according to any one of claims 1 to 3, wherein the amount of calcium sulfate is more than 5% to 30% by mass, preferably more than 5% to 25% by mass, more preferably more than 5% to 20% by mass.

5. The tile adhesive composition according to any one of claims 1 to 4, wherein the amount of OPC is less than 3% by mass, more preferably less than 2% by mass, even more preferably less than 1% by mass.

6. The tile adhesive composition according to claim 5, wherein the total amount of alite-containing cement, alite-containing clinker and / or CAC is 0% to 10% by mass, preferably 0.5% to 5% by mass, more preferably 2.5% to 5% by mass.

7. The tile adhesive composition according to any one of claims 1 to 6, wherein the amount of the organic complexing and thickening agent is 0% to 1.0% by mass, preferably 0.1% to 0.5% by mass, more preferably 0.2% to 0.4% by mass.

8. The amount of the rheology modifier is from 0% by mass to 1.0% by mass, preferably from 0.1% by mass to 0.5% by mass, more preferably from 0.2% by mass to 0.4% by mass, and the tile adhesive composition according to any one of claims 1 to 7.

9. 1% by mass to 50% by mass of GGBS, preferably 5% by mass to 35% by mass, more preferably 12% by mass to 24% by mass of which is ultrafine GGBS, and the tile adhesive composition according to any one of claims 1 to 8.

10. A dry mortar composition comprising the tile adhesive composition according to any one of claims 1 to 9.

11. Further comprising at least one additive selected from the group consisting of a filler, an additional cementitious material, a water-reducing polymer, a latex, a water retention agent, a rheology agent, an antifoaming agent / foam inhibitor, a biocide, a pigment, a flame retardant, an air entraining agent, and a setting retarder, and the dry mortar composition according to claim 10.

12. A wet mortar composition comprising the tile adhesive composition according to any one of claims 1 to 9 and water.

13. The mass ratio of water / binder composition is 0.30 to 0.63, preferably 0.34 to 0.48, more preferably 0.38 to 0.42, and the wet mortar composition according to claim 12.

14. A hardened mortar obtained from the wet mortar composition according to claim 12 or 13.

15. A method for preparing the wet mortar composition according to claim 12 or 13, comprising the step of mixing at least one aggregate and the hydraulic binder composition according to any one of claims 1 to 9 with water, wherein the binder composition is prepared from at least some of the different components of the binder composition obtained in situ, individually and / or in the form of a premix, before or during the mixing step.

16. A method for improving the hydration of a sulfate cement, wherein the sulfate cement comprises: - Granulated blast furnace slag fine powder (GGBS), - More than 5% by mass, preferably at most 30% by mass of calcium sulfate, - 5% by mass or less of ordinary Portland cement (OPC), - 10% by mass or less of an alite-containing cement, an alite-containing clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof and the method comprises the following steps: S1: The following components: - Granulated blast furnace slag fine powder (GGBS), - Calcium sulfate, - Ordinary Portland cement (OPC), ・ A step of preparing calcium aluminate cement (CAC), calcium aluminate clinker, calcium aluminate cement (CAC), calcium aluminate clinker or a mixture thereof A step of preparing, S2: At least one strength-enhancing admixture which is a complexing and thickening polymer selected from the group consisting of carboxymethyl cellulose (CMC), gum arabic (GA), guar, guar ether, agar, carrageenan, xanthan gum, chitosan, pectin, hyaluronic acid, locust bean gum, superabsorbent polymer (SAP), preferably selected from the group consisting of CMC and GA, and S3: A step of preparing at least one rheology modifier such as a cellulose ether different from the complexing and thickening polymer, S4: A step of mixing the above components with water A method comprising.

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