High GGBFS-containing cement-based binders, concretes, and methods

Abstract

Auxiliary cement-based material composition, concrete composition, and method for producing concrete. The auxiliary cement-based material composition comprises a hydraulic binder composition, aggregate material, an activator, and additives. The hydraulic binder composition comprises crushed granular blast furnace slag (GGBFS) and Portland cement (OPC). Sodium sulfate (Na2SO4) is used as the activator. The composition further comprises dolomite (CaMg(CO3)2).

Description

Technical Field

[0001] The present invention relates to a new solution for providing an auxiliary cementitious material composition that includes a slag-based binder material, replaces conventional cement, and can reduce the carbon dioxide emissions of concrete.

[0002] More specifically, the present invention relates to a hydraulic slag cement composition.

[0003] The present invention also relates to a concrete composition and a method for manufacturing concrete.

[0004] The object of the present invention is described in more detail by the preamble of the independent claims of this application.

Background Art

[0005] Concrete has multiple excellent properties such as durability, high compressive strength, low-cost materials, and easy maintenance, and is also fire-resistant and waterproof. Therefore, concrete is the most widely used construction material in the world. Conventionally, cement was the main component of concrete. Unfortunately, it is estimated that 5-8% of carbon dioxide (CO2) emissions are due to the production and use of cement. Most of this emissions are usually due to the use of calcium obtained by burning limestone, which is essential for the reaction between cement and water to form concrete. This is the reason for the large-scale ongoing scientific projects around the world seeking solutions to produce concrete and cement with reduced emissions or no carbon dioxide emissions at all.

[0006] Ordinary Portland cement (OPC) is currently the most widely used cement. Cement containing OPC is often referred to as CEMI-type cement or Portland cement. Significant research efforts have been directed towards finding alternative methods to produce concrete or similar construction materials more sustainably. Several studies support reducing carbon emissions by replacing OPC with various auxiliary cement materials (SCMs). However, known auxiliary cement materials (SCMs) have the disadvantage of lower initial strength compared to Portland cement. Therefore, the practical implementation of new materials is challenging.

[0007] Patent documents 1, 2, 3, and 4 disclose several concrete compositions. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] International Publication No. 2018228839(A1) [Patent Document 2] U.S. Patent Application Publication No. 2019071354(A1) [Patent Document 3] Korean Patent No. 100948754(B1) Specification [Patent Document 4] International Publication No. 2019077390(A1) [Overview of the project]

[0009] [Brief Description of the Invention] The concept of this invention is to provide novel and improved auxiliary cement-based material compositions and concrete. Furthermore, it aims to provide novel and improved methods for producing concrete.

[0010] The characteristic features of the auxiliary cement-based material composition according to the present invention are described in the characteristic portion of the first independent claim.

[0011] The characteristic features of the concrete composition according to the present invention are described in the characteristic portion of the second independent claim.

[0012] The characteristic features of the method according to the present invention are described in the characteristic portion of the third independent claim.

[0013] The proposed solution involves improving the properties of a slag-based hydraulic binder by incorporating dolomite as an auxiliary cement-based material and using sodium sulfate as an activator. In the disclosed composition, dolomite can act as a binder material.

[0014] In the tests conducted, it was found that the use of dolomite accelerated the hydration process of the hydraulic binder composition, thereby improving the development of initial strength.

[0015] The tests further demonstrated that the use of sodium sulfate as an activator had a positive effect on the strength properties.

[0016] When the compound contains a small amount of Portland cement, the development of initial strength is improved.

[0017] The advantage of the proposed solution is that the incorporation of dolomite as an auxiliary cementitious material and sodium sulfate as an activator can improve the development of the initial strength of slag-containing concrete. Initial strength is particularly important because it controls when the molded formwork can be removed.

[0018] Furthermore, there is a growing worldwide demand for the use of alternative cementitious materials to help reduce the environmental impact of conventional concrete. Since the disclosed solution can solve the problems associated with poor early strength development, there is no longer an obstacle to replacing OPC with the disclosed environmentally friendly solution.

[0019] This new solution can also reduce costs as the cycle time for pouring concrete can be shortened, enabling more efficient production of concrete elements and structures.

[0020] Summary of some advantages: - Rapid increase in early strength enables rapid stripping of the product. - Improved rapid early strength characteristics enable the use of the disclosed solution as a binder in ready-mix solutions. - High early and final compressive strengths. - Good workability. - Improved resistance to aggressive chemicals.

[0021] Therefore, the problem of early strength with known solutions can be solved by the disclosed solution.

[0022] According to one embodiment, the composition contains 10 - 12 wt% of ground granulated blast-furnace slag (GGBFS) and 4 - 7 wt% of Portland cement (OPC).

[0023] According to one embodiment, the composition contains 1.4 - 1.8 wt% of dolomite (CaMg(CO3)2).

[0024] According to one embodiment, the composition contains 0.6 - 0.8 wt% of sodium sulfate (Na2SO4).

[0025] According to one embodiment, the composition contains 70-73% by weight of aggregate material.

[0026] According to one embodiment, the composition contains at least one superplasticizer (SP) in an amount of 0.5 to 2.0% by weight relative to the binder material. The superplasticizer (SP) functions as at least one additive material in the composition.

[0027] According to one embodiment, the composition contains 1.5% by weight of a high-flow agent (SP) relative to the binder material.

[0028] According to one embodiment, the composition may, in some cases, not contain any fluidizing agent (SP).

[0029] According to one embodiment, the composition is 6.6% by weight of Portland cement (OPC), 11.5% by weight of crushed granular blast furnace slag (GGBFS), 71% by weight of aggregate, 1.6% by weight of dolomite (CaMg(CO3)2), 0.7% by weight of sodium sulfate (Na2SO4), It contains 6.8% by weight of a high-flow agent (SP).

[0030] According to one embodiment, the composition is 4.9% by weight of Portland cement (OPC), 11.5% by weight of crushed granular blast furnace slag (GGBFS), 72.6% by weight of aggregate, 1.6% by weight of dolomite (CaMg(CO3)2), 0.7% by weight of sodium sulfate (Na2SO4), It contains 6.2% by weight of a high-flow agent (SP).

[0031] According to one embodiment, the composition contains blast furnace cement CEM III / B, which includes crushed granular blast furnace slag (GGBFS) and Portland cement (OPC), with the amount of crushed granular blast furnace slag (GGBFS) being at least 65% by weight.

[0032] According to one embodiment, the composition contains blast furnace cement CEM III / B and CEM I type cement. Therefore, the composition contains a mixture of the two cement types. The amount of GGBFS in the binder is derived from CEM III / B. Furthermore, the amount of Portland cement is derived from CEM III / B and CEM I type cement.

[0033] According to one embodiment, the hydraulic binder composition contains Portland cement (OPC), crushed granular blast furnace slag (GGBFS), and dolomite (CaMg(CO3)2), with the relative proportion of dolomite (CaMg(CO3)2) to the hydraulic binder composition being 0.08 to 0.09.

[0034] According to one embodiment, the relative content of dolomite to the total amount of binder material is 0.06 to 0.10.

[0035] According to one embodiment, the particle size of the components of the hydraulic binder composition is 100 micrometers or less.

[0036] According to one embodiment, the aggregate includes crushed stone having a particle size of 0.02 to 16 mm.

[0037] According to one embodiment, the aggregate includes ordinary sand used for concrete applications.

[0038] According to one embodiment, the ratio of water to the hydraulic binder is 0.45 to 0.65, typically 0.5 to 0.55.

[0039] According to one embodiment, the ratio of aggregate material to hydraulic binder is 3 to 4.

[0040] According to one embodiment, the ratio of aggregate material to hydraulic binder is 4.

[0041] According to one embodiment, the disclosed solution also relates to a concrete composition comprising an auxiliary cement-based material composition and water. The auxiliary cement-based material composition in the concrete conforms to the features and embodiments disclosed herein. Furthermore, the relative proportion of water to the hydraulic binder composition is 0.45 to 0.65, typically 0.50 to 0.55.

[0042] According to one embodiment, the concrete composition has an initial compressive strength of at least 7 MPa after a setting time of 24 hours.

[0043] According to one embodiment, the initial strength after 24 hours is at least 12 MPa. Typically, it is recommended to delay the removal of the molded formwork until the compressive strength of the concrete surface reaches a minimum of 5 MPa. Thus, this requirement is quickly met. Note that the setting time is the time required for the cement paste to harden to a specified consistency. Indirectly, this is related to the initial chemical reaction between cement and water to form the stiff compound.

[0044] According to one embodiment, the concrete composition has an initial compressive strength of at least 18 MPa after a setting time of 2 days.

[0045] According to one embodiment, the concrete composition has an ultimate compressive strength of at least 42 MPa after a setting time of 28 days.

[0046] According to one embodiment, the final or ultimate compressive strength is at least 47 MPa.

[0047] According to one embodiment, the concrete composition is ready-mix concrete. The concrete composition is then manufactured in a ready-mix concrete plant and transported to the site of use by a ready-mix truck.

[0048] According to one embodiment, the concrete composition is casting concrete for a concrete prefabrication plant, and various precast concrete elements are manufactured from the disclosed concrete composition. The precast concrete elements may be, for example, wall elements, precast slabs, hollow core concrete slabs, precast concrete stairs, ground reinforcement piles, or concrete railway sleepers.

[0049] According to one embodiment, the concrete composition is a floor screed for providing a flat surface for a floor finishing material.

[0050] According to one embodiment, the concrete composition is a mortar material intended for use as an adhesive-type material between prefabricated building components such as bricks and blocks.

[0051] According to one embodiment, the disclosed solution also relates to a method for producing concrete comprising an auxiliary cement-based material composition. The method comprises a first step of mixing together dry components comprising at least one hydraulic binder composition, at least one aggregate material, and at least one activator material; a second step of adding a liquid component to the formed dry mixture, wherein the liquid component comprises at least a superfluidizing agent (SP) and water as additives; and a third step of mixing the dry mixture and the liquid component together. The method further comprises the steps of using a hydraulic binder composition containing at least CEM III / B slag cement, which includes crushed granular blast furnace slag (GGBFS) and Portland cement (OPC); including dolomite (CaMg(CO3)2); using sodium sulfate (Na2SO4) as an activating agent; and mixing dolomite (CaMg(CO3)2), CEM III / B slag cement, and sodium sulfate (Na2SO4) activating agent together to form the aforementioned dry mixture.

[0052] According to one embodiment, the method is a step of mixing concrete, wherein the concrete consists of the following components: 4.9% by weight of Portland cement (OPC), 11.5% by weight of crushed granular blast furnace slag (GGBFS), 72.6% by weight of aggregate, 1.6% by weight of dolomite (CaMg(CO3)2), 0.7% by weight of sodium sulfate (Na2SO4), 6.2% by weight of a high-flow agent (SP), This includes further steps.

[0053] According to one embodiment, the method further comprises the steps of adding 1.6 wt% CEM I Portland cement and mixing it with 16.4 wt% CEM III / B slag cement to form a mixed cement used as a hydraulic binder composition.

[0054] The above embodiments and their features can be combined to provide a desired configuration.

[0055] [Disclosure of several relevant materials and features] [Hydrosetting cement] A type of cement that sets and hardens rapidly when water is added to finely ground cement is called hydraulic cement.

[0056] [Initial strength] The initial strength development of concrete is extremely important.

[0057] Initial strength is particularly important because it controls when the formwork can be removed.

[0058] It is recommended to delay demolding until the compressive strength of the concrete surface reaches a minimum of 5 MPa. This minimizes the risk of mechanical damage to the molded structure. If the concrete curing temperature is below 20°C, the curing time needs to be extended.

[0059] 〔aggregate〕 Aggregates are medium-sized granular materials used as components of concrete, and may include sand, gravel, crushed stone, slag, recycled concrete, and geosynthetic aggregates. Aggregates function as reinforcing materials that add strength to concrete, which is a composite material.

[0060] [Ground granular blast furnace slag (GGBFS)] Crushed granular blast furnace slag, also commonly referred to as slag, is a by-product of steelmaking. Slag is mainly composed of CaO, SiO2, aluminum oxide (Al2O3), and magnesium oxide (MgO). When used as part of Portland cement concrete, slag reacts with both water (potential hydraulic reaction) and hydrated cement paste (pozzolanic reaction), resulting in a finer microstructure than ordinary Portland cement. During the initial exposure period, concrete containing slag has a diffusion coefficient similar to or slightly higher than ordinary Portland cement concrete, but after periods exceeding 90 days, it has a lower diffusion coefficient.

[0061] The main drawback of using cement or formulations containing GGBS is that while the strength at 28 days may be similar to that achieved with CEM I alone, the initial strength can be significantly lower.

[0062] Granular slag is produced by rapidly cooling slag from a blast furnace with a large amount of water. The inventors refer to this as the granulation process. In the granulation process, liquid slag is transformed into a granular product with a particle size of 0-2 mm, known as slag sand. As a result of this process, the slag also takes on an amorphous structure. Finally, the granular slag is pulverized into a fine powder.

[0063] Crushed granular blast furnace slag is highly cementitious and contains a large amount of calcium silicate hydrate (CSH), a compound that improves the strength, durability, and appearance of concrete.

[0064] Granular slag is a raw material for producing blast furnace cement (CEM III). Under certain conditions, crushed granular slag mixed with Portland cement can also be used directly in concrete by mixing it with Portland cement.

[0065] [CEM III] CEM III is also known as blast furnace cement (BFC). Blast furnace cement (CEM III / A, B, C) is primarily based on Portland cement clinker (OPC) and crushed granular blast furnace slag (GGBFS).

[0066] There are three different classified types of blast furnace cement: CEM III / A, CEM III / B, and CEM III / C, where the letters indicate the amount of slag.

[0067] CEM III / B contains approximately 70% GGBS.

[0068] [CEM I] CEM I is a cement type manufactured from Portland cement for concrete.

[0069] [Dolomite] Dolomite (CaMg(CO3)2) can be obtained from natural sedimentary rocks and is a low-cost, environmentally friendly material.

[0070] Studies have shown that dolomite can improve the properties of cement composites.

[0071] Using dolomite as a substitute for OPC resulted in higher compressive strength.

[0072] [Sodium sulfate, Na2SO4] Sodium sulfate (also known as sodium sulfate or sodium carbonate) is an inorganic compound with the formula Na2SO4. Sodium sulfate is a solid powder that is extremely soluble in water.

[0073] Sodium sulfate can be used as an activator for cement paste.

[0074] [High-flow agent (SP)] High-flow agents, also known as high-performance water-reducing agents, are additives used in the production of high-strength concrete. High-flow agents can reduce the water content of concrete by more than 30% during production. They also delay the curing of concrete. Their addition to concrete allows for a reduction in the water-to-cement ratio without negatively affecting the workability of the mixture. Furthermore, SPs improve flow properties, enabling the production of self-consolidating and high-performance concrete. They significantly improve the performance of hardened fresh paste. A lower water-to-cement ratio increases the strength of the concrete.

[0075] High-flow agents are synthetic polymers. Compounds used as high-flow agents include sulfonated naphthaleneformaldehyde condensates, sulfonated melamineformaldehyde condensates, acetoneformaldehyde condensates, and polycarboxylate ethers.

[0076] [Some examples of tests conducted] The initial intensity development of CEM III / B was experimentally achieved by preparing different mixture compositions.

[0077] Desired mixtures with appropriate initial strength were prepared in small quantities (prismatic samples 40 × 40 × 16 mm). The formulation was carried out using standard sand as aggregate, with a water / binder ratio of 0.45–0.5. The most promising results were selected for further experimentation and modified based on application requirements.

[0078] Crushed granular blast furnace slag (GGBFS) can be reacted under strongly alkaline conditions by using alkaline materials such as NaOH, KOH, and Na2SiO3. Since CEM III / B contains 70-75% blast furnace slag, the initial experimental setup involved adding different ratios of NaOH + Na2SiO3, KOH, NaOH, and Na2SiO3 to make them alkali-activated materials. Several promising results were obtained from the experiments, and a mixture composition containing CEM III / B + NaOH + Na2SiO3 was selected for large-scale mixing.

[0079] Metakaolin is a clay mineral containing significant amounts of alumina and silicon, and is typically used as a precursor material for geopolymerization. Unfortunately, using metakaolin formulated with CEM III / B and an alkaline solution (NaOH + Na2SiO3) did not improve the initial strength properties of the final product.

[0080] Limestone is a common filler used in cement-based materials. The effect of using limestone is to improve strength by forming a compact structure due to the reactive CaCO3 within it. However, it has been found that limestone does not promote the achievement of initial strength in different CEM III / B mixtures.

[0081] Magnesium oxide (MgO), calcium oxide (CaO), and calcium hydroxide (CaOH) are other precursor materials used to promote the reactivity of alkali-activated materials. However, in the CEM III / B mixture, these were found not to support the achievement of initial strength.

[0082] Furthermore, it was found that sodium carbonate (Na2CO3), sodium sulfate (Na2SO4), and silica fume (SiO2) could not improve the high initial strength of CEM III / B. However, the final strength could be relatively high. Overall, if initial strength is not the target, a final strength of 45-55 MPa can be achieved by using 6-10% Na2CO3, Na2SO4, or SiO2 relative to the binder content.

[0083] Gypsum (CaSO4) is another precursor material used to improve the initial strength properties of cement-based materials. However, the use of gypsum results in a decrease in the final strength of CEM III / B-based products.

[0084] A prismatic compound with superior initial strength characteristics was selected for large-scale mixing. The compound was calculated and designed for large-scale mixing, taking into account the requirements of the final product, including high-flowability agents, aggregates, and curing conditions.

[0085] Formulation Experiment 1: CEM III / B 11%+CEM I 3%+(Na2SiO3+NaOH) 1~1.2%+SP 5% Daily strength 9~10MPa 28 day strength 28~35MPa

[0086] Formulation Experiment 2: CEM III / B 14%+(Na2SiO3+NaOH) 1~1.2%+SP 5% Daily strength 8~10MPa 28 day strength 26~32MPa

[0087] Formulation Experiment 3: CEM III / B 14% + CEM I 2% + Limestone 2% + Dolomite 2% + Na2SO4 1% + SP 6% Daily strength 3~5MPa 28 day strength 30~32MPa

[0088] Formulation Experiment 4: CEM III / B 12-16% + CEM I 1.5-2% + Dolomite 1-2% + Na2SO4 1-1.5% + SP 6% Daily strength 6~13MPa Intensity 35-47 MPa on the 28th

[0089] Formula experiment 4 proved to be the most promising. This formula used commercially available CEM III / B.

[0090] For comparison, a homemade CEM III / B mixture containing pure GGBFS (70%) and CEM I (30%) was prepared in the laboratory. This mixed slag cement was then mixed with the other material components from the previous mix design experiment 4. In this way, the mixed composition for mix design experiment 5 described below was prepared.

[0091] Formulation Experiment 5: GGBFS 11% + CEM I 7% + Dolomite 2% + Na2SO4 1% + SP 6% Daily strength 7MPa Intensity 42 MPa on the 28th

[0092] The curing conditions in the test were a temperature of 22°C and a relative humidity (RH) of 95%.

[0093] Another objective was the use of CEM III / B in precast products, such as in the manufacture of piles for ground reinforcement. Therefore, several additional tests were conducted. The same components were used in the tests; the only difference was the amount of CEM III / B binder. Due to the increased amount of binder material, the amount of SP was also increased. In addition, curing conditions were different, using a higher temperature of 40°C and RH65%.

[0094] Formulation Experiment 6: CEM III / B 19% + CEM I 2% + Dolomite 2% + Na2SO4 1% + SP 8% Daily strength 20MPa 28 day strength 45MPa

[0095] In one further test configuration, SP was removed from the previous formulation experiment 6. All other materials and conditions remained the same.

[0096] Formulation Experiment 7: CEM III / B 19% + CEM I 2% + Dolomite 2% + Na2SO4 1% Daily strength 22MPa Intensity 47 MPa on the 28th

[0097] Some common issues to mention regarding the experiment: The high-flow agent SP was used to reduce the need for water addition. Commercially available SP materials were used in the test. When the amount of SP was 1.5% of the binder content, the amount of water added could be significantly reduced.

[0098] The tests revealed that the presence of Na2SO4 can promote hydration reactions in both cement and slag-containing materials, resulting in the formation of CSH-containing materials with a dense structure. [Brief explanation of the drawing]

[0099] Some embodiments of the proposed solution are shown in more detail in the following drawings.

[0100] [Figure 1] This is a schematic and simplified diagram showing several possible auxiliary cement-based material compositions. [Figure 2] This is a schematic and simplified diagram showing several possible auxiliary cement-based material compositions. [Figure 3] This is a schematic and simplified diagram showing several possible auxiliary cement-based material compositions. [Figure 4] This is a schematic and simplified diagram illustrating the manufacturing process of concrete paste. [Figure 5]This is a table showing the components and range of one possible formulation of the disclosed solution. [Figure 6] This is a schematic and simplified diagram showing possible concrete products and use cases for the disclosed solution. [Figure 7] This is a table showing the components of possible formulations of the disclosed solution. [Figure 8] This is a table showing the components of possible formulations of the disclosed solution. [Figure 9] This is a table showing some relative proportions of different materials in the disclosed solution. [Figure 10] This is a schematic diagram showing the strength values ​​for two different formulations at different setting times.

[0101] For the purpose of clarity, some embodiments of the proposed solution are shown in the drawings in simplified form. In the drawings, the same reference numerals are used to refer to the same elements and features. [Modes for carrying out the invention]

[0102] Figure 1 discloses that the disclosed auxiliary cement material composition SCM may include crushed granular blast furnace slag GGBFS and Portland cement OPC, which function as hydraulic binder materials. The composition further comprises sodium sulfate Na2SO4 as an activator. The composition also provides dolomite (CaMg(CO3)2). The relative amounts of these components are disclosed above herein.

[0103] Figure 2 further discloses that the auxiliary cement material SMC may include a mixture of CEM III / B type slag cement and CEM I type ordinary cement. Next, the crushed granular blast furnace slag GGBFS is derived from the CEM III / B component, and the Portland cement OPC is derived from both CEM III / B type and CEM I type cement.

[0104] Figure 3 discloses that the auxiliary cement material SMC may further contain one or more additives. Typically, a high-flow agent SP is required to control the water content in the concrete paste. Furthermore, the composition may contain aggregate material, which may contain, for example, natural stone of different particle sizes. The aggregate material may be natural sand or gravel, or crushed stone material.

[0105] Figure 4 discloses a possible manufacturing process for concrete paste. First, dry material components are added and mixed together in a first mixing step. Then, liquid components are added to the formed dry mixture and a second mixing step is performed. After water is added to the dry mixture, a second mixing step is performed, and then the hydraulic reaction is initiated. Once the dry material components and liquid components are properly mixed, the concrete paste is ready for use.

[0106] Figure 5 is a table showing the range of weight percentages (wt%) of component amounts for material formulations according to the disclosed solutions. Table 1 is an overview of the possible scope already disclosed above in this specification.

[0107] Figure 6 shows that the disclosed solution can be implemented when manufacturing ready-mixed concrete, casting concrete, floor screed, and mortar materials. The range of component proportions and other disclosed material properties and quantities can be adjusted to achieve the properties required for different concrete products and use cases.

[0108] Figures 7 and 8 show Tables 2 and 3 disclosing the components of two different formulations. Figures 7 and 8 relate to formulation A, and Figure 8 relates to formulation B. As can be shown, the amounts of CEM I and CEM III / B differ in these formulations. Formulation A contains a mixture of both cement types, while formulation B uses only CEM III / B. In both formulations, the CEM III / B used contains 70% GGBFS and 30% CEM I, with formulation A containing a total of 11.5 wt% GGBFS and 6.6 wt% CEM I, while formulation B contains a total of 11.5% GGBFS and 4.9% CEM I. Due to this difference in the content of the binding material, slight differences occur in at least some of the other components.

[0109] In addition to the components listed in Tables 2 and 3, water is present to a total weight percentage of 100%.

[0110] Figure 9 shows Table 4, which discloses some relative proportions of various materials in formulations A and B described above. Furthermore, the possible range of relative amounts is also disclosed.

[0111] Figures 7 to 9 summarize the materials and numerical values ​​disclosed herein in a more easily understandable format.

[0112] Figure 10 shows the measured strength values ​​for formulations A and B described above at different setting times.

[0113] The drawings and their descriptions are intended merely to illustrate the concept of the present invention. However, the scope of protection of the present invention is defined in the claims of this application.

Claims

1. A hydraulic binder composition, At least one aggregate material, at least one activating substance and A supplemental cement-based material (SCM) composition comprising, The hydraulic binder composition comprises crushed granular blast furnace slag (GGBFS) and Portland cement (OPC), The activating substance is sodium sulfate (Na ２ SO ４ ) and The hydraulic binder composition is dolomite (CaMg(CO) ３ ) ２ A composition characterized by further comprising ).

2. The composition according to claim 1, characterized in that it contains 10 to 12% by weight of crushed granular blast furnace slag (GGBFS) and 4 to 7% by weight of Portland cement (OPC).

3. The composition contains 1.4 to 1.8% by weight of dolomite (CaMg(CO) ３ ) ２ The composition according to claim 1 or 2, characterized by containing ).

4. The composition contains 0.6 to 0.8% by weight of sodium sulfate (Na ２ SO ４ The composition according to any one of claims 1 to 3, characterized by containing ).

5. The composition according to any one of claims 1 to 4, characterized in that it contains 70 to 73% by weight of aggregate material.

6. The aforementioned composition, The composition according to any one of claims 1 to 5, comprising 0.5 to 2.0% by weight of at least one fluidizing agent (SP) relative to the binder material, wherein the fluidizing agent (SP) functions as at least one additive.

7. The aforementioned composition, 6.6% by weight of the Portland cement (OPC), 11.5% by weight of the aforementioned crushed granular blast furnace slag (GGBFS), The aggregate is 71% by weight, 1.6% by weight of said dolomite (CaMg(CO ３ )) and ２ ​ 0.7% by weight of the sodium sulfate (Na ２ SO ４ )and, 6.8% by weight of a high-flow agent (SP), A composition according to any one of claims 1 to 6, characterized by containing the following.

8. The aforementioned composition, 4.9% by weight of the Portland cement (OPC), 11.5% by weight of the aforementioned crushed granular blast furnace slag (GGBFS), The aggregate is 72.6% by weight, 1.6% by weight of the dolomite (CaMg(CO) ３ ) ２ )and, 0.7% by weight of the sodium sulfate (Na ２ SO ４ )and, 6.2% by weight of a high-flow agent (SP), A composition according to any one of claims 1 to 6, characterized by containing the following.

9. The aforementioned composition, The composition according to any one of claims 1 to 8, comprising blast furnace cement CEM III / B containing the crushed granular blast furnace slag (GGBFS) and the Portland cement (OPC), wherein the amount of the crushed granular blast furnace slag (GGBFS) is at least 65% by weight.

10. The hydraulic binder composition, The Portland cement (OPC), the crushed granular blast furnace slag (GGBFS), and the dolomite (CaMg(CO) ３ ) ２ ) contains the dolomite (CaMg(CO)) in the hydraulic binder composition. ３ ) ２ The composition according to any one of claims 1 to 9, characterized in that the relative proportion of ) is 0.06 to 0.

10.

11. A concrete composition containing an auxiliary cement-based material composition and water, The auxiliary cement-based material composition is one of the claims described in any one of claims 1 to 10. A concrete composition characterized in that the relative proportion of water to the hydraulic binder composition is 0.40 to 0.

60.

12. The aforementioned concrete composition, The concrete composition according to claim 11, characterized in that it has an initial compressive strength of at least 7 MPa after a setting time of 24 hours.

13. The aforementioned concrete composition, The concrete composition according to claim 11 or 12, characterized in that it has an initial compressive strength of at least 18 MPa after a setting time of 2 days.

14. The aforementioned concrete composition, The concrete composition according to any one of claims 11 to 13, characterized in that it has an ultimate compressive strength of at least 42 MPa after a setting period of 28 days.

15. The aforementioned concrete composition, A concrete composition according to any one of claims 11 to 14, characterized in that it is ready-mixed concrete.

16. A method for producing concrete containing an auxiliary cement-based material composition, The aforementioned method, In the first step, a dry component comprising at least one hydraulic binder composition, at least one aggregate material, and at least one activating substance is mixed together. A step of adding a liquid component to a formed dry mixture, wherein the liquid component includes at least a fluidizing agent (SP) and water as additives, In the second step, the dry mixture and the liquid component are mixed together, The step of using CEM III / B slag cement containing crushed granular blast furnace slag (GGBFS) and Portland cement (OPC) as the hydraulic binder composition, The hydraulic binder composition contains dolomite (CaMg(CO) ３ ) ２ The step of blending ) As the activating substance, sodium sulfate (Na ２ SO ４ The steps to use ) and The aforementioned dolomite (CaMg(CO) ３ ) ２ ), the CEM III / B slag cement, and the sodium sulfate (Na ２ SO ４ ) The step of mixing together the activating substance to form the dry mixture, A method characterized by including

17. Concrete composition, the following components: 4.9% by weight of the Portland cement (OPC), 11.5% by weight of the aforementioned crushed granular blast furnace slag (GGBFS), The aggregate is 72.6% by weight, 1.6% by weight of the dolomite (CaMg(CO) ３ ) ２ )and, 0.7% by weight of the sodium sulfate (Na ２ SO ４ )and, 6.2% by weight of a high-flow agent (SP), The method according to claim 16, characterized by including a compound.

18. The method according to claim 16, characterized in that 1.6% by weight of CEM I Portland cement is added and mixed with 16.4% by weight of the CEM III / B slag cement to form a mixed cement used as the hydraulic binder composition.

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