Three-component hydraulic binder composition

Abstract

The present invention relates to a process for the synthesis of the mineral compound C4A3$ (Elimite) and the compounds gypsum, calcium sulfate hemihydrate, anhydrite, and mixtures thereof (collectively C4A3$). x and x is a rational number from 0 to 2), and optionally C2S (belite), 12 The present invention proposes a ternary hydraulic binder composition, characterized in that it contains added calcium carbonate (Docalcium heptaaluminate) A7. The present invention further proposes a method for producing the ternary composition, a method for producing water-containing building chemical compositions, and the use of the ternary composition in building chemical compositions including spatula fillers, screeds, and repair mortars, tile adhesives, tile grouts, plasters, base coats, and sealants.

Description

[Technical Field]

[0001] The present invention comprises elymite and calcium sulfate, and optionally belite, and mineral compound C 12 The present invention relates to a three-component hydraulic binder composition characterized by the addition of A7 (dodecacalcium heptaaluminate). Furthermore, the present invention relates to a method for producing this three-component composition, a method for producing a building chemical composition containing water, and the use of this three-component composition in building chemical compositions including spatula fillers, screeds, repair mortars, tile adhesives, tile grouts, plaster, base coats, and sealants. [Background technology]

[0002] Portland cement was first mentioned in British Patent No. 5022 (Joseph Aspdin, 1824), and has since undergone continuous development. Current Portland cement contains approximately 70% by weight of CaO + MgO, approximately 20% by weight of SiO2, and approximately 10% by weight of Al2O3 + Fe2O3. Portland cement hardens with the action of water. A drawback is the significant environmental impact of its production, specifically its large CO2 footprint.

[0003] Calcium aluminate cement ("CAS cement") primarily contains CaO·Al2O3. It can be obtained by melting calcium oxide (CaO) or limestone (CaCO3) together with bauxite or aluminate. Calcium aluminate cement contains approximately 20–40 wt% CaO, up to approximately 5 wt% SiO2, approximately 35–80 wt% Al2O3, and up to approximately 20 wt% Fe2O3. Calcium aluminate cement is defined according to DIN EN 14647 (01 / 2006). Calcium aluminate cement has a smaller environmental impact than Portland cement, i.e., a smaller CO2 footprint.

[0004] Calcium sulfoaluminate cement ("CSA cement") is distinguished from Portland cement by its rapid bonding, rapid strength development, and reduced shrinkage. CSA cement has been used for decades as a binder in concrete in bridges, airport runways, road repairs, and many other applications requiring rapid hardening. CSA cement is also used in dry mortars for self-leveling flooring, leveling mixes, casting mortars, tile adhesives, and grouts. In contrast to Portland cement, CSA cement is fired at lower temperatures, i.e., 1100–1300°C, resulting in a smaller environmental impact, i.e., a smaller CO2 footprint. Furthermore, CSA cement is less alkaline than Portland cement. However, there is still room for further improvement in the hardening time, strength development, and final strength of CSA cement.

[0005] Lithium salts are often used to accelerate the setting and hardening of CSA cement. However, lithium is in short supply globally, its production raises environmental concerns, and the working conditions, even under favorable conditions, are problematic from a human perspective. It is necessary to reduce or completely avoid the addition of lithium required for acceleration.

[0006] In Cement Chemist Notation (CCN), the components of mineral compounds are generally represented in their oxide form. "C" represents CaO, "A" represents Al2O3, "S" represents SiO2, "$" represents SO3 from now on, and "H" represents H2O.

[0007] CSA cement consists of C4A3$ (E-rimite) and calcium sulfate (gypsum, calcium sulfate hemihydrate, and / or anhydrous gypsum (hereinafter collectively referred to as C$H) xreferred to as, where x is a rational number from 0 to 2)) is contained. CSA cement may also contain a substantial amount of C2S (belite). When in contact with water, CSA cement hardens under the action of water and mainly forms ettringite (C6A$3H 32 ).

[0008] U.S. Patent No. 6,730,162 B1 (Abstract), corresponding to International Publication No. 01 / 74737 A1, discloses a method for manufacturing a hydraulic binder, which comprises mixing at least the following two binders together: (a) a first hydraulic binder having a mineral compound C4A3$ as one of the main components; and (b) a second sulfate binder based on calcium sulfate hemihydrate and / or anhydrite obtained by subjecting gypsum to heat treatment. This patent also provides a binder containing, among other main components, (a) a mineral compound C4A3$; and (b) calcium sulfate hemihydrate of the α-type or β-type with the general formula: CaSO4·1 / 2H2O, and / or anhydrite of type III with the general formula: CaSO4·εH2O (ε is in the range of 0 to 0.5, preferably in the range of 0.06 to 0.11), or anhydrite of type II with the formula: CaSO4.

[0009] German Patent Application Publication No. 10 2010 034874 A1 (Abstract) discloses a mineral binder composition containing (A) at least one pozzolanic or latent hydraulic material, (B) at least one calcium sulfoaluminate, and (C) at least one calcium sulfate hemihydrate and / or anhydrous calcium sulfate, wherein the weight ratio of component (A) to component (B) is 5:1 to 1:10, and the weight ratio of component (B) to component (C) is 50:1 to 1:2. Further, a building chemical product containing the corresponding mineral binder composition is disclosed.

[0010] International Publication No. 2012 / 127066 A1 (Abstract) discloses a dry cement composition for producing a wet coating formulation consisting of mortar or concrete, which in particular enables the production of a thick inorganic coating without efflorescence, without adversely affecting other properties required of the corresponding wet formulation, namely ease of handling, workability, pumpability, rheology, ease of mixing and application, and ease of cleaning equipment, and also without adversely affecting the properties of the hardened object obtained from the wet formulation, namely surface protection / sealing properties, hardness, crack resistance, durability, and fire resistance. A composition according to this invention comprises (a) calcium aluminate cement (CAC) and / or calcium sulfoaluminate cement (CSA), (c) anhydrous gypsum, and at least one of the following compositions: (b) an organic binder; (d) a hardening retarder; (e) a hardening accelerator; (f) a water-retaining agent; (g) a filler; (h) a waterproofing agent; (i) a coloring agent; (j) a photocatalytic additive; (k) a fiber; and (m) an antifoaming agent. The above composition contains (almost entirely) no Portland cement, and the ratio of composition (a) / (c) is 90 / 10 to 99.99 / 0.01. This invention also relates to a wet formulation obtained by mixing the cement composition with water, a method for producing the cement composition and the corresponding wet formulation, a coating obtained by applying the wet formulation, its application, and a coated substrate.

[0011] Chinese Patent Application Publication No. 109987906A (Abstract) discloses a cement-based rapid-strength non-shrinking grout material. This grout material comprises the following raw materials, indicated by parts by weight: 50 to 55 parts by weight of high-belite sulfoaluminate special cement material, 5 to 10 parts by weight of heavy calcium carbonate powder, 38 to 43 parts by weight of quartz sand, 0.5 to 0.7 parts by weight of latex powder, 0.5 to 0.7 parts by weight of water-reducing agent, 0.36 to 0.5 parts by weight of defoaming agent, 0.05 to 0.1 parts by weight of cellulose ether, 0.1 to 0.15 parts by weight of citric acid, and 0.03 to 0.05 parts by weight of lithium carbonate. Here, this high-belite sulfoaluminate special cement material is obtained by dry blending the following raw materials, indicated by parts by weight: 60-70 parts by weight of high-belite sulfoaluminate cement clinker powder, 5-10 parts by weight of α-type high-strength gypsum powder, 5-10 parts by weight of β-type gypsum powder, and 15-20 parts by weight of ultrafine fly ash. The resulting grout material has early ultra-high strength in 2-4 hours, excellent fluidity, long-term strength growth rate and long-term strength, as well as some plastic and rigid expansion after hardening.

[0012] Canadian Patent Application Publication No. 2922773 A1 (page 9) contains 22% C2S, 60% C4A3$, and 5% C 12 A “barnstone” CSA cement containing A7, 8% C3S, and 4% C2(A,F) is disclosed. In addition, 0-20% calcium sulfate may also be present.

[0013] Section

[0066] of U.S. Patent Application Publication No. 2015 / 0329422 A1 states that 4-47% of C4A3$ and CA, and 0-4% of C 12 A binder composition containing a mixture of A7, 1-16% C4AF, and 5-19% C2S is disclosed. Sulfates may also be present.

[0014] U.S. Patent Application Publication No. 2016 / 0107933 A1 (Abstract and Claim 1) discloses the use of belite-containing calcium aluminate as an accelerator for Portland cement. For this purpose, paragraph

[0014] of this patent application further states C 12 It has been disclosed that hydraulic reactive additives, such as amorphous calcium aluminate having a composition close to A7, may be added to a calcium sulfoaluminate mixture based on E-limite and free of lime and anhydrous gypsum. However, this document does not disclose any accelerators for CSA cement.

[0015] Chu Yong Sik et al., “Properties of Shrinkage Reducing Agent and Mortar with C 12 "A7-based Slag and Petroleum Cokes Ash," Journal of the Korean Ceramic Society, Vol. 50, No. 5, pp. 319-325, 2013, describes C for reducing shrinkage of ordinary Portland cement ("OPC"). 12 A7 slag has been disclosed. [Overview of the project] [Problems that the invention aims to solve]

[0016] In addition to the aforementioned need to reduce or avoid lithium salts, the problems underlying the present invention are as follows: The binder composition should not contain Portland cement and therefore should have a pH value lower than that of Portland cement. The binder composition should dry, set, and harden in a shorter time than conventional CSA cement, which has higher early and final strength, and the hardened composition should exhibit higher durability. The binder composition can be cured at a lower temperature. [Means for solving the problem]

[0017] These problems have been solved by the technical features of the independent claims. The dependent claims relate to preferred embodiments. Surprisingly, compositions containing C4A3$ and C$H x have been found to be greatly improved by the addition of C 12 A7.

[0018] The advantages of the ternary hydraulic binder composition according to the present invention are that the composition is low in lithium or even lithium-free and does not contain Portland cement. The advantages of the composition of the present invention are that, compared to all conventional binary and ternary binder systems, it shows a short time interval between processing time and setting time and between the start and end of setting, shows improved durability even under critical conditions, has a faster drying rate, higher early and final strength, higher strength at low temperature, earlier walkability and availability, reduced shrinkage, faster curing at low temperature, a very smooth surface structure, lower sensitivity to dispersion adhesives, improved processing characteristics, improved adhesive strength in the form of an adhesive composition, a lower pH value, reduced efflorescence, improved natural stone compatibility, and no need for further chromate reduction.

[0019] According to a first aspect, the present invention provides a ternary hydraulic binder composition comprising a mineral compound C4A3$ (yeelimite) and a component selected from the group consisting of gypsum, calcium sulfate hemihydrate, anhydrite, and mixtures thereof (collectively referred to as C$H x where x is a rational number from 0 to 2) and containing the addition of the mineral compound C 12 A7 (dodecacalcium heptaaluminate).

[0020] As used throughout this specification, the term "containing the addition" means that additional C 12 A7 has been added to the CSA cement. As explained above, the CSA cement contains 0 to 4% or even 5% of C 12 A7. The mineral compound C 12A7's "additive content" refers to C 12 The addition of A7 means that its natural content has increased significantly. 12 If A7 does not exist, then 0.1% C 12 A7 may be sufficient. As a rule of thumb, 1% C 12 If A7 is present, at least 0.5% C 12 A7 should be added; 5% C 12 If A7 is present, at least 2% C 12 A7 should be added. The upper limit is approximately 20% C. 12 It should be A7.

[0021] E-limmite (C4A3) is a naturally occurring form of calcium sulfoaluminate, Ca4(AlO2)6SO3. E-limmite is most commonly found as a component of CSA cement. Its production is carried out by heating appropriate amounts of finely ground alumina, calcium carbonate, and calcium sulfate at 1100-1300°C, preferably in the presence of a small amount of flux such as Fe2O3. Heating above 1350°C causes e-limmite to begin to decompose.

[0022] Calcium sulfate (C$H x Calcium sulfate is an inorganic compound having the formula CaSO4 and associated hydrates. One particular hydrate is well known as plaster of Paris, and another hydrate exists naturally as mineral gypsum. The main hydration states are anhydrous gypsum (x=0), hemihydrate (x=0.5), and dihydrate (gypsum, x=2). Calcium sulfate is technically generated as waste, for example, in the desulfurization of flue gases.

[0023] Dodecacalcium heptaluminate (Ca 12 Al 14 O 33 or C 12A7) is an inorganic solid that is rarely found in nature. It is an important phase in calcium aluminate cement and an intermediate (900-1200°C) in the production of Portland cement. 12 A7 can be produced via a solid-phase reaction, specifically by heating a mixture of calcium carbonate and aluminum oxide or aluminum hydroxide powder in air. It is commercially available.

[0024] The compositions according to the present invention may further contain C2S (belite). Belite is an industrial mineral and is important in the manufacture of Portland cement. Its main component is dicalcium silicate, Ca2SiO4. Belite-rich CSA cement was developed to further improve the durability of CSA cement while simultaneously providing a smaller environmental footprint than ordinary Portland cement ("OPC").

[0025] C4A3$ (E-Limite), Calcium Sulfate (C$H x A mixture of C2S (belite), and any C2S (belite) can exist in the form of ordinary CSA cement. However, these components can be mixed together as needed.

[0026] In the composition according to the present invention, the added C 12 The amount of A7 can be between 0.1 and 20% by weight. Below 0.1% by weight, no measurable effect is likely to be obtained, while above 20% by weight, it results in the waste of high-value material. 12 The amount of A7 added is preferably in the range of 0.2 to 20% by weight, more preferably in the range of 0.5 to 10% by weight. 1% C in CSA cement 12 If A7 is present, at least 0.5% C 12 A7 should be added. As a rule of thumb, 5% C 12 If A7 is present, at least 2% C 12 A7 should be added.

[0027] In the case of lithium-free compositions or compositions with very low lithium content, CSA cement C$H x Increasing the content is advantageous. For a typical CSA cement containing approximately 50% by weight of C4A3, approximately 25% by weight of C2S, approximately 5% by weight of anhydrous gypsum, and small amounts of other phases, approximately 35% by weight of calcium sulfate can be added, leaving excess gypsum in the hydrated product after the addition.

[0028] Common formulations are shown below (percentages are expressed in weight %): Sand-free formulation 24-64% clinker rich in eluite 6-40% calcium sulfate (total amount) 0.2-20% Dodecacalcium heptaaluminate (C 12 A7)

[0029] Mixture containing sand 30~75% quartz sand 0-40% fine filler (e.g., limestone powder) 12-32% clinker rich in eluite 3-20% calcium sulfate (total amount) 0.1-20% Dodecacalcium heptaaluminate (C 12 A7) 0-5% pozzolanes 0-20% redispersible polymer powder (e.g., acrylate copolymer or EVA copolymer) 0-1% lithium salt 0-0.2% retarder (e.g., tartaric acid) and optionally additional additives (e.g., thickeners, fluidizers)

[0030] The further additives mentioned above can be selected from adhesives, thickeners, fluidizers, surfactants, fibers, complexing agents, shrinkage reducers, flexibility imparters (softeners), hydrophobic agents, Portland cement, CAS cement, and mixtures thereof.

[0031] According to a second aspect, the present invention provides a method for producing a binder composition comprising the following: Mineral compound C4A3$ (Erimite), gypsum, calcium sulfate hemihydrate, anhydrous gypsum, and mixtures thereof (collectively C$H) x The invention provides a mixture of a component selected from the group consisting of (where x is a rational number from 0 to 2) and an optional mineral compound C2S (belite), and 0.1 to 20% by weight, preferably 0.5 to 10% by weight of C 12 Add A7 (dodecacalcium heptaaluminate). Preferably, water is also added before using the binder composition.

[0032] According to a third aspect, the present invention relates to C4A3$, C$H x , and optionally C2S as a curing accelerator for binder compositions, mineral compound C 12 The use of A7 (dodecacalcium heptaaluminate) is provided.

[0033] Furthermore, the present invention provides, but is not limited to, the use of the binder compositions described above in compositions including spatula fillers, screeds, and repair mortars, tile adhesives, tile grouts, plaster, base coats, and sealants.

[0034] Next, the present invention will be described in more detail with reference to the following non-limiting embodiments and reference examples, and the accompanying drawings.

[0035] Raw materials are expressed as a percentage by weight. "Rp." stands for blend. The expression (23 / 50) means the test was conducted at 23°C and 50% relative humidity. The expression (5 / 90) means the test was conducted at 5°C and 90% relative humidity.

[0036] The "fine filler" is limestone powder with a particle size of approximately 1-45 μm, obtained from Rheinkalk GmbH. The "e-limeite-rich clinker" is "i.tech(registered trademark) ALICEM," obtained from Heidelberg Cement AG, containing approximately 50% by weight of e-limeite. The "calcium sulfate" is the calcium sulfate in the clinker, with optionally added calcium sulfate (anhydrous gypsum) added. 12 A7 is "TERNAL EP" from IMERYS Aluminates. The "redispersible polymer powder" is ethylene vinyl acetate copolymer, for example, commercially available as "VINNAPAS" from Wacker AG. The "retardant" is tartaric acid, and the "further additives" are thickeners and fluidizers. The "pozzolane" is selected from metakaolin, microsilica, fly ash, glass powder, and mixtures thereof. [Brief explanation of the drawing]

[0037] [Figure 1] Figure 1 shows the shrinkage of the self-leveling composition at room temperature. [Figure 2] Figure 2 shows the shrinkage of the self-leveling composition at +5°C. [Modes for carrying out the invention]

[0038] General method Adjust the temperature of the water and powder to 23°C ± 1°C. Mix 1 kg of the sample and water in a polyethylene bucket equipped with an electric drill as a stirrer until homogeneous and free of lumps (approximately 1 minute). Smaller batches may be mixed in a kitchen bowl equipped with an electric kitchen mixer.

[0039] Method A Immerse the spatula in the mixed composition and lift it out at 5-minute intervals. Droplets falling from the spatula will fall back into the composition. The composition is still usable when the droplets are completely submerged on the surface of the composition. Once a convex meniscus has formed on the surface of the composition by the falling droplets, Processing time Reaching the end. Method E The same applies, however, the viscosity of the composition is determined by a skilled worker in this case.

[0040] Method B Place the spreading table horizontally. Place the test ring in the center of the spreading table. Pour a sufficient amount of self-leveling composition into the test ring at 23°C ± 1°C. After, for example, 1, 10, or 15 minutes, quickly lift the ring perpendicular to the spreading table. Exactly 1 minute later, measure the slump (i.e., the diameter of the slump) twice, perpendicular to each other. Take the average value. slump Record as [cm].

[0041] Method D The adhesive tensile strength and sag resistance [mm] are measured according to DIN EN 12004-2:2017-05. [Examples]

[0042] Example 1 [Table 1]

[0043] C 12 When A7 is used as an additive, curing is accelerated under normal climate and low temperatures, and shrinkage is minimized. Compressive strength and flexural tensile strength are also improved. Figures 1 and 2 show the significantly improved shrinkage values.

[0044] Example 2 [Table 2-1]

[0045] [Table 2-2]

[0046] C 12 As a result of using A7 as an additive, higher (early) strength was obtained and curing was accelerated. Both shrinkage and expansion tended to decrease. More C 12 Using A7 results in higher (early) strength. However, a 10% concentration negatively affects 4-hour strength and shrinkage or expansion behavior, although (early) strength and curing remain good.

[0047] Example 3 [Table 3]

[0048] C 12 As a result of using A7 as an additive, higher (early) strength was obtained, curing was accelerated, and shrinkage was reduced. 12 Using A7 results in higher (early) strength. However, a 10% increase negatively impacts (early) strength.

[0049] Example 4 [Table 4]

[0050] C 12 When A7 is used as an additive, higher (earlier) strength is obtained, curing is accelerated in normal climates and low temperatures, and shrinkage or expansion behavior is minimized.

[0051] Example 5 [Table 5]

[0052] C 12 Using A7 as an additive allows for faster curing time at 5°C and higher early strength in CSA cement, while using significantly smaller amounts of binder and lithium salt compared to OPC. This disclosure includes the following embodiments of the invention: <Aspect 1> Mineral compound C 4 A 3 $(E-Limite) and, Gypsum, calcium sulfate hemihydrate, anhydrous gypsum, and mixtures thereof (collectively C$H) x It is called a group and includes elements selected from the group consisting of (where x is a rational number from 0 to 2), Mineral compound C 12 A 7 It is characterized by containing (dodecacalcium heptaaluminate) as an additive. Three-component hydraulic binder composition. <Aspect 2> Mineral compound C 2 The binder composition according to embodiment 1, further comprising S (B-Lite). <Aspect 3> As the first main component, the mineral compound C 4 A 3 $(E-Limite) and, The second main component is calcium sulfate, Arbitrarily C 2 S (B-Lite) and A binder composition according to embodiment 1 or 2, wherein the mixture containing the above exists in the form of calcium sulfoaluminate (CSA) cement. <Aspect 4> 0.1 to 20% by weight, preferably 0.5 to 10% by weight of C 12 A 7 A binder composition according to any one of embodiments 1 to 3, comprising: <Aspect 5> 24-64% by weight of eluite, 6-40% by weight of calcium sulfate (total amount), and 0.2-20% by weight of dodecacalcium heptaaluminate (C 12 A 7 )、 A binder composition according to any one of embodiments 1 to 4, including the following: <Aspect 6> 30-75% by weight of quartz sand, 0-40% by weight of fine fillers, 12-32% by weight of E-limate, 3-20% by weight of calcium sulfate (total amount), 0.1-20% by weight of dodecacalcium heptaaluminate (C 12 A 7 )、 0-5% by weight of pozzolanes, 0-20% by weight of redispersible polymer powder, 0-1% by weight of lithium salt, 0-0.2% by weight of retarder, and optionally further additives, A binder composition according to any one of embodiments 1 to 4, including the following: <Aspect 7> A method for producing the binder composition according to any one of embodiments 1 to 6, including the following: Provide a mixture containing the following: (a) Mineral compound C 4 A 3 $(E-Limite), (b) Gypsum, calcium sulfate hemihydrate, anhydrous gypsum, and mixtures thereof (collectively C$H) x The group consists of (where x is a rational number from 0 to 2), and any, (c) Mineral compound C 2 S(B-Lite); and Add the following: (d) 0.1 to 20% by weight, preferably 0.5 to 10% by weight of C 12 A 7 (Dodecacalcium heptaaluminate). <Aspect 8> The method according to embodiment 7, further comprising the following steps: (i) optionally, the addition of further additives, and (ii) Add water. <Pattern 9> C 4 A 3 $, C$H x , and optionally C 2 Mineral compound C for promoting the setting and hardening of binder compositions containing S 12 A 7 Use. <Aspect 10> C 4 A 3 $, C$H x , and optionally C 2 Mineral compound C for improving the hydration performance of binder compositions containing S 12 A 7 Use. <Aspect 11> C 4 A 3 $, C$H x , and optionally C 2 Mineral compound C to reduce the shrinkage of binders containing S 12 A 7 Use. <Aspect 12> Use of a binder composition according to any one of embodiments 1 to 6 in a building chemical composition comprising a spatula filler, screed, repair mortar, tile adhesive, tile grout, plaster, base coat, and sealant.

Claims

1. Mineral compound C ４ A ３ $ (E-limate) and, Gypsum, calcium sulfate hemihydrate, anhydrous gypsum, and mixtures thereof (collectively C$H) ｘ A three-component hydraulic binder composition comprising a component selected from the group consisting of (where x is a rational number from 0 to 2), The three-component hydraulic binder composition includes a mineral compound C １２ A ７ (Contains dodecacalcium heptaaluminate) The aforementioned three-component hydraulic binder composition does not contain Portland cement, and 30-75% by weight of quartz sand, 0-40% by weight of fine fillers, 12-32% by weight of E-limate, 3-20% by weight of calcium sulfate (total amount), 0.1 to 20% by weight of dodecacalcium heptaaluminate (C １２ A ７ ), 0-5% by weight of pozzolanes, 0-20% by weight of redispersible polymer powder, 0-1% by weight of lithium salt, 0-0.2% by weight of retarder, and optionally further additives A three-component hydraulic binder composition characterized by containing the following.

2. Mineral compound C ２ The binder composition according to claim 1, further comprising S (B-Lite).

3. As the first main component, the mineral compound C ４ A ３ $ (alite) and The second main component is calcium sulfate, Arbitrarily C ２ S (B-Lite) and The binder composition according to claim 1 or 2, wherein the mixture containing is present in the form of calcium sulfoaluminate (CSA) cement.

4. A method for producing the binder composition according to any one of claims 1 to 3, including the following: The mixture contains the following: (a) Mineral compound C ４ A ３ $ (E-limate), (b) Gypsum, calcium sulfate hemihydrate, anhydrous gypsum, and mixtures thereof (collectively C$H) ｘ The constituent elements are selected from the group consisting of (where x is a rational number from 0 to 2), and arbitrarily, (c) Mineral compound C ２ S (B-Lite); and Add the following: (d) 0.1 to 20% by weight of C １２ A ７ (Dodecacalcium heptaaluminate).

5. The method according to claim 4, further comprising the following steps: (i) optionally, further additives may be added, and (ii) Add water.

6. Use of the binder composition according to any one of claims 1 to 3 in a building chemical composition comprising a spatula filler, screed, repair mortar, tile adhesive, tile grout, plaster, base coat, and sealant.

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