A high mineral content stone iron aluminate cement material and a method of making the same

Abstract

The application relates to the technical field of cement materials, and particularly discloses a high ore fused stone ferrite aluminate cement material and a preparation method thereof. The cement material is prepared by jointly grinding and treating high belite ferrite aluminate cement clinker and a modifier. The modifier is composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2). The modifier composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source is used to perform mechanochemical coupling modification on the belite ferrite aluminate cement clinker, multi-level interface interaction occurs under the induction of mechanical force, directional poisoning and growth inhibition of calcium aluminate crystal nuclei are realized, the early strength of the cement is maintained, and the volume stability of the cement material is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of cement materials technology, specifically to a high-mineralized ferroaluminate cement material and its preparation method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] High-Belite sulfoferrate aluminate cement is a novel low-carbon cementitious material with anhydrous calcium sulfoaluminate and dicalcium silicate (C2S) as the main minerals. It has advantages such as rapid hardening and early strength, micro-expansion, corrosion resistance, and low carbon emissions, and is widely used in emergency repair and construction projects, marine engineering, and large-volume concrete applications. However, during the hydration and hardening process of high-Belite sulfoferrate cement, anhydrous calcium sulfoaluminate reacts with gypsum to generate a large amount of ettringite (AFt). Although an appropriate amount of ettringite can provide early strength and compensate for shrinkage, excessive or delayed formation of ettringite often leads to cement stone volume expansion, microcrack propagation, and even structural damage.

[0004] Currently, the main methods for inhibiting the excessive formation of ettringite include: (1) reducing the content of anhydrous calcium sulfoaluminate in cement clinker; (2) adding mineral admixtures (such as fly ash, slag, etc.); and (3) introducing inorganic salt inhibitors (such as barium salts, lithium salts, etc.). However, reducing the content of anhydrous calcium sulfoaluminate will affect the early strength development of cement; the activity of mineral admixtures is insufficient, and their effect is slow, so the inhibitory effect on early ettringite is limited; while inorganic salt inhibitors can inhibit the formation of ettringite by precipitating sulfate or complexing calcium ions, they have problems such as high dosage, easy washing, and uneven distribution, and may introduce other harmful side reactions, leading to the deterioration of the performance of cement materials. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-mineralized aluminate ferroaluminate cement material and its preparation method, which effectively inhibits excessive formation of ettringite while maintaining the early strength development of cement, thereby achieving the goal of significantly improving volume stability while preserving the early strength of cement. Specifically, the technical solution of this invention is as follows.

[0006] First, this invention discloses a high-melting-point ferroaluminate cement material, which is prepared by grinding high-belite sulfoferroaluminate cement clinker with a modifier. The modifier consists of succinyl phosphonate, quaternary ammonium salt, and aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2), and its structural formula is shown in formula (1) below.

[0007] ;

[0008] Equation (1).

[0009] Furthermore, the high belite sulfoaluminate cement clinker comprises the following components in the following proportions: 35-50 parts by weight of anhydrous calcium sulfoaluminate, 25-40 parts by weight of dicalcium silicate (C2S), 10-20 parts by weight of tetracalcium aluminoferrite (C4AF), and 5-10 parts by weight of dicalcium ferrite (C2F).

[0010] Furthermore, the mass ratio of the succinyl phosphonate, quaternary ammonium salt, and aluminum source is 1:0.1~0.5:0.2~0.8.

[0011] Furthermore, the quaternary ammonium salt includes at least one of the following: hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride, and dioctadecyldimethylammonium chloride.

[0012] Further, the aluminum source includes at least one of the following: diatomite, boehmite, pseudoboehmite, etc. Optionally, the diatomite includes at least one of the following: gibbsite, monohydrate, etc.

[0013] Furthermore, the modifier is 0.5-3% of the mass of the high belite sulfoferrate aluminate cement clinker.

[0014] Secondly, this invention discloses a method for preparing the high-mineralized molten stone aluminate cement material, comprising the following steps:

[0015] (1) The succinyl phosphonate, quaternary ammonium salt and aluminum source are mixed and then pre-ground to obtain the modifier.

[0016] (2) After mixing the high belite sulfide aluminate cement clinker with the modifier, the mixture is ground to obtain the high ore molten stone aluminate cement material.

[0017] Further, in step (1), the rotation speed of the pre-grinding treatment is 200~400 r / min, and the grinding time is 15~30 min.

[0018] Further, in step (2), the grinding speed is 400~700 r / min and the grinding time is 30~120 min.

[0019] Furthermore, in step (2), the ambient temperature is controlled to be ≤50℃ during the grinding process.

[0020] Furthermore, in step (2), the fineness of the high-ore molten stone aluminate cement material is 300~500 mesh.

[0021] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0022] This invention utilizes a modifier composed of succinyl phosphonate, quaternary ammonium salt, and an aluminum source to perform mechanochemical coupling modification on Belite sulfoferroaluminate cement clinker. Under mechanical force induction, multi-level interfacial interactions occur, thereby achieving directional poisoning and growth inhibition of ettringite crystal nuclei. This significantly improves the volume stability of the cement material while maintaining its early strength. In the initial grinding stage, the quaternary ammonium salt in the modifier preferentially adsorbs onto the negatively charged active sites on the surface of the cement clinker particles under the electrostatic field generated by mechanical friction, forming initial physical anchoring. Then, as grinding continues, the succinyl phosphonate molecules undergo conformational adjustment under shear and impact forces, with its phosphonate and carboxyl groups interacting with the Ca2+ groups on the surface of the cement clinker particles. 2+ Al 3+ A coordination exchange reaction occurs, forming an insoluble calcium phosphonate / calcium carboxylate complex, achieving chemical grafting of organic molecules onto the surface of cement clinker particles. Later in the grinding process, the active Al released from the aluminum source... 3+ Under mechanical force, it diffuses into the mineral phase surface of cement clinker, partially replacing Si in the mineral lattice. 4+ Alternatively, it may occupy oxygen vacancies to form Al-O-Si or Al-O-Al bridging structures, reconstructing the coordination environment of the mineral surface, and finally forming a hybrid modified layer on the surface of cement particles. This modified layer is rich in phosphonic acid groups, carboxyl groups, and quaternary ammonium salt functional groups, constituting an active barrier that inhibits the excessively rapid formation of ettringite. This hybrid modified layer is not a simple physical coating, but rather selectively regulates the hydration process through the spatial arrangement and chemical activity of functional groups. The phosphonic acid groups and carboxyl groups in the hybrid modified layer can strongly chelate Ca... 2+ A dense complex film is formed on the surface of cement clinker particles, delaying the formation of Ca2+. 2+ The release of ettringite (AFt) reduces its supersaturation, inhibiting its heterogeneous nucleation and growth; the quaternary ammonium salt further hinders the deposition of ettringite nuclei on the surface through electrostatic repulsion. Additionally, the active Al in the hybrid modified layer... 3+ It can also provide more heterogeneous nucleation sites for hydrated calcium silicate (CSH), promoting its preferential nucleation and rapid growth. Simultaneously, due to the dynamic reversibility of the coordination between phosphonic acid groups and carboxyl groups in the hybrid modified layer, the chelated Ca is gradually released under the hydration heat of cement clinker. 2+ By continuously supplying the calcium source required for the growth of CSH in a controllable manner, and avoiding excessive inhibition that leads to hydration retardation, it is possible to control the excessive formation of ettringite and prevent later expansion and cracking while ensuring normal or even accelerated early strength development of cement. This resolves the contradiction between ettringite inhibition and early strength loss, and at the same time improves the impermeability, freeze-thaw resistance and volume stability of cement.

[0023] This invention proposes for the first time a mechanochemical modification method based on succinyl phosphonate. Through grinding-induced chemical grafting and multi-toothed anchoring of organic molecules on the surface of cement minerals, it overcomes the shortcomings of traditional liquid-phase admixtures, such as easy elution, uneven distribution, and short-term effects. This method achieves permanent fixation and controlled release of the modifier on the surface of cement particles. Furthermore, the modification process of this invention is highly compatible with existing cement grinding processes, requiring no additional solvents or heating equipment. The process is simple, cost-effective, and easily scaled up for industrial applications. Moreover, the resulting cement material can be widely used in construction engineering, bridge engineering, road engineering, emergency repair and reconstruction projects, waterproofing projects, and other fields requiring high volume stability and durability. It is particularly suitable for large-volume concrete, ultra-long structural concrete, and marine engineering concrete. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention and do not constitute an undue limitation of the invention.

[0025] Figure 1 The image shows a sample of the modifier prepared in Example 1 below.

[0026] Figure 2 The image shows a sample of high-mineralized aluminate cement prepared in Example 1 below.

[0027] Figure 3 The image shows a sample of the modifier prepared in Example 2 below.

[0028] Figure 4 The image shows a sample of high-mineralized aluminate cement prepared in Example 2 below.

[0029] Figure 5 The image shows a sample of the modifier prepared in Example 3 below.

[0030] Figure 6 The image shows a sample of high-mineralized aluminate cement prepared in Example 3 below.

[0031] Figure 7 The image shows a sample of the modifier prepared in Example 4 below.

[0032] Figure 8 The image shows a sample of high-mineralized aluminate cement prepared in Example 4 below.

[0033] Figure 9 The image shows a sample of the modifier prepared in Example 5 below.

[0034] Figure 10 The image shows a sample of high-mineralized aluminate cement prepared in Example 5 below.

[0035] Figure 11 The image shows a sample of the modifier prepared in Example 6 below.

[0036] Figure 12 The image shows a sample of high-mineralized aluminate cement prepared in Example 6 below.

[0037] Figure 13 The image shows a sample of high-mineralized aluminate cement prepared in Example 7 below. Detailed Implementation

[0038] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the invention. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. The preferred embodiments and materials described in this invention are for illustrative purposes only. The technical solutions of the present invention will now be further described with reference to specific embodiments.

[0039] Example 1: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0040] (1) The raw materials were taken according to the mass ratio of succinyl phosphonate, quaternary ammonium salt, and aluminum source = 1:0.2:0.35. Wherein: the quaternary ammonium salt is hexadecyltrimethylammonium bromide, and the aluminum source is gibbsite powder. Then, the succinyl phosphonate, quaternary ammonium salt, and aluminum source were placed together in a planetary ball mill for pre-grinding treatment. The grinding speed was 300 r / min, and the grinding time was 20 min. After completion, the modifier powder was obtained, such as... Figure 1 As shown.

[0041] (2) Take 2% of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 42 parts by weight of anhydrous calcium sulfoaluminate, 32 parts by weight of C2S, 15 parts by weight of C4AF, and 8 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 12:1, the grinding speed is 500 r / min, and the grinding time is 60 min. During the grinding process, the ambient temperature is controlled to be ≤50℃. After completion, the obtained powder is passed through a 300-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 2 As shown.

[0042] Performance tests: (1) Etnacite formation test: The ettringite formation of the high-mineralized molten aluminate cement material prepared in this embodiment after 28 days of hydration was tested using the Rietveld full-spectrum fitting method of X-ray diffraction (XRD). At the same time, the ettringite formation of the high-belite sulfide aluminate cement clinker (with the same composition as in this embodiment) without the modifier of this embodiment was tested as a blank group. (2) Linear expansion rate test: The linear expansion rate of the high-mineralized molten aluminate cement material and the blank group after 28 days of hydration was tested according to GB / T 751-2020 standard. (3) Compressive strength test: The compressive strength of the high-mineralized molten aluminate cement material and the blank group after 1 day, 3 days and 28 days of hydration were tested according to GB / T17671-2021 standard. The test results of the above indicators are shown in Table 1 below.

[0043] Table 1

[0044]

[0045] Example 2: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0046] (1) The raw materials were taken according to the mass ratio of succinyl phosphonate, quaternary ammonium salt, and aluminum source = 1:0.1:0.2. Wherein: the quaternary ammonium salt is octadecyltrimethylammonium chloride, and the aluminum source is boehmite powder. Then, the succinyl phosphonate, quaternary ammonium salt, and aluminum source were placed together in a planetary ball mill for pre-grinding treatment. The grinding speed was 400 r / min, and the grinding time was 15 min. After completion, the modifier powder was obtained, such as... Figure 3 As shown.

[0047] (2) Take 3% by weight of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 50 parts by weight of anhydrous calcium sulfoaluminate, 40 parts by weight of C2S, 20 parts by weight of C4AF, and 10 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 8:1, the grinding speed is 700 r / min, the grinding time is 30 min, and the ambient temperature is controlled to be ≤50℃ during the grinding process. After completion, pass the obtained powder through a 400-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 4 As shown.

[0048] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 2 below.

[0049] Table 2

[0050]

[0051] Example 3: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0052] (1) The raw materials were taken in a mass ratio of succinyl phosphonate, quaternary ammonium salt, and aluminum source of 1:0.5:0.8. Wherein, the quaternary ammonium salt was dioctadecyl dimethyl ammonium chloride, and the aluminum source was boehmite powder. Then, the succinyl phosphonate, quaternary ammonium salt, and aluminum source were placed together in a planetary ball mill for pre-grinding at a speed of 200 r / min for 30 min. After grinding, the modifier powder was obtained, such as… Figure 5 As shown.

[0053] (2) Take 0.5% of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 35 parts by weight of anhydrous calcium sulfoaluminate, 25 parts by weight of C2S, 10 parts by weight of C4AF, and 5 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 10:1, the grinding speed is 400 r / min, and the grinding time is 120 min. During the grinding process, the ambient temperature is controlled to be ≤50℃. After completion, the obtained powder is passed through a 500-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 6 As shown.

[0054] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 3 below.

[0055] Table 3

[0056]

[0057] Example 4: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0058] (1) The raw materials were taken according to the mass ratio of quaternary ammonium salt to aluminum source = 0.2:0.35. Wherein: the quaternary ammonium salt is hexadecyltrimethylammonium bromide, and the aluminum source is gibbsite powder. Then, the quaternary ammonium salt and aluminum source were placed together in a planetary ball mill for pre-grinding treatment at a grinding speed of 300 r / min for 20 min. After completion, the modifier powder was obtained, such as... Figure 7 As shown.

[0059] (2) Take 0.71% of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 42 parts by weight of anhydrous calcium sulfoaluminate, 32 parts by weight of C2S, 15 parts by weight of C4AF, and 8 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 12:1, the grinding speed is 500 r / min, and the grinding time is 60 min. During the grinding process, the ambient temperature is controlled to be ≤50℃. After completion, the obtained powder is passed through a 300-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 8 As shown.

[0060] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 4 below.

[0061] Table 4

[0062]

[0063] Example 5: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0064] (1) Take each raw material according to the mass ratio of succinyl phosphonate and aluminum source = 1:0.8. Wherein: the aluminum source is pseudoboehmite powder. Then, the succinyl phosphonate and aluminum source are placed together in a planetary ball mill for pre-grinding treatment. The grinding speed is 200 r / min and the grinding time is 30 min. After completion, the modifier powder is obtained, such as Figure 9 As shown.

[0065] (2) Take 0.39% of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 35 parts by weight of anhydrous calcium sulfoaluminate, 25 parts by weight of C2S, 10 parts by weight of C4AF, and 5 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 10:1, the grinding speed is 400 r / min, and the grinding time is 120 min. During the grinding process, the ambient temperature is controlled to be ≤50℃. After completion, the obtained powder is passed through a 500-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 10 As shown.

[0066] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 5 below.

[0067] Table 5

[0068]

[0069] Example 6: A method for preparing a high-mineralized aluminate ferroaluminate cement material, comprising the following steps:

[0070] (1) Take each raw material according to the mass ratio of succinyl phosphonate and quaternary ammonium salt = 1:0.1. Wherein: the quaternary ammonium salt is octadecyltrimethylammonium chloride. Then, the succinyl phosphonate and the quaternary ammonium salt are placed together in a planetary ball mill for pre-grinding treatment. The grinding speed is 400 r / min and the grinding time is 15 min. After completion, the modifier powder is obtained, such as Figure 11 As shown.

[0071] (2) Take 2.54% of the modifier powder of the high-belite sulfoaluminate cement clinker. The cement clinker comprises the following components in the following proportions: 50 parts by weight of anhydrous calcium sulfoaluminate, 40 parts by weight of C2S, 20 parts by weight of C4AF, and 10 parts by weight of C2F. Then, place the cement clinker and the modifier powder together in a planetary ball mill for grinding. The grinding media is made of zirconia, the ball-to-material ratio is 8:1, the grinding speed is 700 r / min, the grinding time is 30 min, and the ambient temperature is controlled to be ≤50℃ during the grinding process. After completion, pass the obtained powder through a 400-mesh sieve to obtain the high-melting-point ferroaluminate cement material, such as... Figure 12 As shown.

[0072] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 6 below.

[0073] Table 6

[0074]

[0075] Example 7

[0076] A method for preparing a high-mineralized aluminate ferroaluminate cement material includes the following steps:

[0077] Take 0.22% succinyl phosphonate from high-belite sulfoaluminate cement clinker. This cement clinker comprises the following components in the following proportions: 35 parts by weight of anhydrous calcium sulfoaluminate, 25 parts by weight of C2S, 10 parts by weight of C4AF, and 5 parts by weight of C2F. Then, place the cement clinker and succinyl phosphonate together in a planetary ball mill for grinding. The grinding media are made of zirconia, the ball-to-material ratio is 10:1, the grinding speed is 400 r / min, and the grinding time is 120 min. During the grinding process, the ambient temperature is controlled to ≤50℃. After completion, the obtained powder is passed through a 500-mesh sieve to obtain high-melting-point ferroaluminate cement material. Figure 13 As shown.

[0078] Performance testing: The high-mineralized aluminate cement material prepared in this embodiment was tested using the same method as in Example 1 above for the amount of ettringite formed, the linear expansion rate, and the compressive strength at 1, 3, and 28 days of hydration. The test results for each of the above indicators are shown in Table 7 below.

[0079] Table 7

[0080]

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. A high-mineralized aluminate-iron cement material, characterized in that, The cement material is prepared by grinding high-Belit sulfoferroaluminate cement clinker with a modifier; the modifier is composed of succinyl phosphonate, quaternary ammonium salt, and aluminum source in a mass ratio of 1:0.1~0.5:0.2~0.8; wherein, the structural formula of the succinyl phosphonate is shown in formula (1): ； Equation (1); The quaternary ammonium salt includes at least one of hexadecyltrimethylammonium bromide, octadecyltrimethylammonium chloride, and dioctadecyldimethylammonium chloride; the aluminum source includes at least one of gibbsite, boehmite, boehmite, and pseudoboehmite.

2. The high-mineralized aluminate cement material according to claim 1, characterized in that, The high belite sulfoaluminate cement clinker comprises the following components in the following proportions: 35-50 parts by weight of anhydrous calcium sulfoaluminate, 25-40 parts by weight of dicalcium silicate, 10-20 parts by weight of tetracalcium aluminoferrite, and 5-10 parts by weight of dicalcium ferrite.

3. The high-mineralized aluminate cement material according to any one of claims 1-2, characterized in that, The modifier is 0.5-3% of the mass of high belite sulfoferrate aluminate cement clinker.

4. The method for preparing the high-mineralized aluminate cement material according to any one of claims 1-3, characterized in that, Includes the following steps: (1) The succinyl phosphonate, quaternary ammonium salt and aluminum source are mixed and then pre-ground to obtain a modifier; (2) After mixing the high belite sulfide aluminate cement clinker with the modifier, the mixture is ground to obtain the high ore molten stone aluminate cement material.

5. The method for preparing the high-mineralized aluminate cement material according to claim 4, characterized in that, In step (1), the rotation speed of the pre-grinding process is 200~400 r / min, and the grinding time is 15~30 min.

6. The method for preparing the high-mineralized aluminate cement material according to claim 4, characterized in that, In step (2), the grinding speed is 400~700 r / min and the grinding time is 30~120 min.

7. The method for preparing the high-mineralized aluminate cement material according to claim 4, characterized in that, In step (2), the ambient temperature is controlled to be ≤50℃ during the grinding process.

8. The method for preparing the high-mineralized aluminate cement material according to claim 4, characterized in that, In step (2), the fineness of the high-mineralized molten stone aluminate cement material is 300~500 mesh.

Images