CN117417135A - Cementing material based on calcined clay and preparation method thereof - Google Patents
Cementing material based on calcined clay and preparation method thereof Download PDFInfo
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- CN117417135A CN117417135A CN202311407617.0A CN202311407617A CN117417135A CN 117417135 A CN117417135 A CN 117417135A CN 202311407617 A CN202311407617 A CN 202311407617A CN 117417135 A CN117417135 A CN 117417135A
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- 239000000463 material Substances 0.000 title claims abstract description 62
- 239000004927 clay Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 40
- 239000010440 gypsum Substances 0.000 claims abstract description 21
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000012190 activator Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- 239000004281 calcium formate Substances 0.000 claims description 6
- 229940044172 calcium formate Drugs 0.000 claims description 6
- 235000019255 calcium formate Nutrition 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000003469 silicate cement Substances 0.000 claims description 4
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 3
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 2
- 239000010446 mirabilite Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims 3
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000006227 byproduct Substances 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000002585 base Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials, and discloses a cementing material based on calcined clay and a preparation method thereof. The invention uses a multi-element composite excitation means, and by reasonably collocating and using calcined clay, steel slag, cement clinker and gypsum and utilizing the organic coordination of various chemical alkaline excitants, not only provides a high-added-value recycling mode for industrial byproducts, but also reduces the consumption of the cement clinker, effectively improves the early-stage compressive strength of the cementing material and ensures the later-stage strength of the material. The method has wide application scene, simple process flow and great potential application value.
Description
Technical Field
The invention relates to the field of building materials, in particular to a cementing material based on calcined clay and a preparation method thereof.
Background
Calcined clay is an industrial clay which is calcined at 700 ℃ to 850 ℃ by taking waste residue soil as a raw material. When the cementing material is prepared by using the cementing material, the effective utilization of the residual mud and the slag is realized. In addition, compared with the traditional cement clinker, the energy consumption and CO in the production process can be reduced 2 Discharge amount. In addition, the calcined clay has higher pozzolanic activity, and the interaction of the calcined clay and the ordinary portland cement or clinker is beneficial to generating additional CO in the system 3 The AFM phase and the C- (A) -S-H gel, so that the prepared calcined clay cement material has smaller pore diameter than ordinary silicate cement, thereby being beneficial to the development of mechanical properties.
For this reason, chinese patent document CN 116409948A provides a low-carbon composite gel material based on regenerated micropowder, and a preparation method and application thereof, which prepares the low-carbon composite gel material by adding a small amount of calcined clay and regenerated micropowder to cement clinker, but the problem of early strength decrease is faced although the later strength can be remarkably improved after the calcined clay is incorporated into cement.
Therefore, it is necessary to provide a cement having low energy consumption and high early strength, which can sufficiently exhibit the characteristics of low carbon and low energy consumption and high pozzolanic activity of calcined clay.
Disclosure of Invention
In view of the above, the present invention aims to provide a calcined clay-based cementing material and a preparation method thereof, which solve the problems of low early strength, narrow application range, etc. of the existing calcined clay-based cementing material.
In order to solve the technical problems, the invention adopts the following technical scheme:
a cementing material based on calcined clay and a preparation method thereof, comprising the following steps:
weighing all components in the base material, mixing with an alkaline activator, and grinding to obtain the cementing material based on calcined clay.
The base material is one or more selected from calcined clay, steel slag, slag powder, cement clinker and gypsum; and/or the alkaline activator is selected from one or more of calcium formate, calcium lignosulfonate, sodium sulfate, calcium chloride, sodium carbonate, sodium silicate and sodium hydroxide.
Preferably, the alkaline activator comprises the following components in percentage by mass of 1 to 3:9 to 11:0.3 to 0.8 of calcium formate, sodium hydroxide and sodium silicate.
The alkaline excitant accounts for 0.1 to 10 percent of the mass content of the base material; preferably, the alkaline excitant accounts for 5-7% of the mass of the base material; and/or the alkaline excitant is solid, and the solid content of the alkaline excitant is 95-100%.
The base material is prepared from the following raw materials in percentage by mass: 30-60% of calcined clay, 3-30% of steel slag, 30-60% of slag, 4-25% of cement clinker and 0-5% of gypsum.
Preferably, the base material comprises the following raw materials in percentage by mass: 30-60% of calcined clay, 3-5% of steel slag, 30-60% of slag, 4-6% of cement clinker and 0.5-2% of gypsum.
Al in the calcined clay 2 O 3 >15％，Al/Si>0.3，CaO<3％，SO 3 <3%; preferably, al in the calcined clay 2 O 3 The content is more than or equal to 20 percent, and the compressive strength activity index is higher than 80 percent in 28 days; more preferably, the chemical components of the calcined clay comprise, in mass percent: al (Al) 2 O 3 ：25～40％，SiO 2 ：60～75％，K 2 O+Na 2 O≤3％，CaO+MgO≤5％，SO 3 <3％。
The steel slag is block-shaped waste slag which is produced in steelmaking and consists of oxides of calcium, iron, silicon and magnesiumThe mass content of CaO in the steel slag is 30-60 percent, and SiO is the same as that of the steel slag 2 10-30% of MgO, 2-20% of Fe 2 O 3 The mass content is 10-40%; preferably, the steel slag comprises the following chemical components in percentage by mass: 38-50% of Fe 2 O 3 ：25～35％、SiO 2 ：14～20％、MgO：4.5～12％、MnO：≤5％、Al 2 O 3 ：1～10％、CaF 2 ≤2％、SO 3 ≤5％。
The slag is water quenched or air cooled blast furnace slag; and/or the cement clinker is silicate cement clinker, which meets the requirements of GB/T21372 silicate cement clinker; and/or the gypsum is selected from at least one of desulfurized gypsum, mirabilite gypsum, phosphogypsum and titanium gypsum.
Drying the base materials before mixing; and/or the powder obtained in the grinding process is sieved by a square hole with the diameter of 60-100 mu m, and the sieving allowance of the powder is 0-10%.
The cement clinker and the calcined clay are dry materials, and the water content of the commercial products is less than 1%, so that no special explanation is needed.
The alkaline excitant is also solid, contains water mainly including crystal water and chemically bound water/hydroxyl, and has low dosage without water control.
The invention also provides a cementing material based on calcined clay.
The invention has the beneficial effects that
1. The invention provides a cementing material based on calcined clay, which comprises a base material and an alkaline activator, wherein the base material comprises the following components in percentage by mass: 30-70% of calcined clay, 0-30% of steel slag, 10-70% of slag powder, 0-25% of cement clinker and 0-5% of gypsum, and through the combined use of the calcined clay and the slag powder in the specific proportion and the use of an alkaline activator, the cementing material has the advantages of rapid formation of strength, high final strength and the like, overcomes the defects of long setting time and slow hydration reaction rate of other calcined clay-based cementing materials, and the compressive strength of the prepared cementing material is obviously improved.
2. The invention provides a calcined clay-based cementing material, wherein an alkaline activator is selected from one or more of calcium formate, calcium lignosulfonate, sodium sulfate, calcium chloride, sodium carbonate, sodium silicate and sodium hydroxide, and particularly the alkaline activator is prepared by adopting the following components in percentage by mass of 1-3: 9 to 11:0.3 to 0.8 of calcium formate, sodium hydroxide and sodium silicate.
3. The invention provides a calcined clay-based cementing material, wherein an alkaline activator accounts for 0.1-10% of the mass content of a base material; especially, the alkali excitant is controlled to be 5-7% of the mass content of the base material, so that the reaction between the gel components can be further promoted, and the flexural strength and the compressive strength of the gel material are further improved.
4. The invention provides a calcined clay-based cementing material, which comprises the following components in percentage by weight: 30-60% of calcined clay, 3-30% of steel slag, 30-60% of slag, 4-25% of cement clinker, 0-5% of gypsum, and preferably, the percentage content of each component in the base material is controlled as follows: 30-60% of calcined clay, 3-30% of steel slag, 30-60% of slag, 4-25% of cement clinker and 0-5% of gypsum, and the performance of the cementing material can be further improved. More preferably, the percentage of each component in the control base is: 30-60% of calcined clay, 3-5% of steel slag, 30-60% of slag, 4-6% of cement clinker and 0.5-2% of gypsum, the compressive strength of the obtained cementing material can be greatly improved, and the compressive strength of the cementing material is respectively 20.1-35.6MPa, 24.2-46.1MPa and 34.5-65.8MPa after curing in water for 3 days, 7 days and days.
5. The invention provides a calcined clay-based cementing material, which promotes the chemical substances in the cementing material components to be in a better proportion by controlling the chemical components and the content of a base material, thereby further improving the compressive strength and the stability of the cementing material.
6. The preparation method of the cementing material based on calcined clay provided by the invention is simple and has low consumption in the preparation process; the hardening is fast, the strength is high, and the application range is wide; the preparation method is easy, low in cost, energy-saving, low-carbon and environment-friendly; from the aspects of technology, economy and environmental protection, the invention has great social, economic and environmental benefits and strong practicability, and is suitable for popularization and use.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Examples 1 to 10 each provide a calcined clay-based cement, the formulation of which is shown in Table 1, and the cement of each example was prepared according to the following steps:
weighing each component in the base material according to the table 1, mixing with an alkaline activator, uniformly mixing and grinding the prepared materials to powder with 80 mu m square hole sieve residue not more than 10%, and obtaining the cementing material based on calcined clay.
Table 1 formulation of the gel material (kg)
Wherein the chemical composition of the calcined clay used in the examples and comparative examples is shown in Table 2 below
TABLE 2 chemical composition of calcined clay (%)
| Material | Al 2 O 3 | SiO 2 | Na 2 O | Fe 2 O 3 | CaO | K 2 O | SO 3 |
| Calcined clay | 26.36 | 70.27 | 0.01 | 0.8 | 0.18 | 1.47 | 0.33 |
Wherein examples 1 to 9 and comparative examples 1 to 2 use steel slag of chemical composition shown in Table 3 below
TABLE 3 chemical composition of steel slag (%)
| Material | CaO | SiO 2 | MgO | Fe 2 O 3 | CaF 2 | MnO | Al 2 O 3 | SO 3 | Loss on ignition |
| Steel slag | 38.71 | 15.55 | 5.9 | 26.48 | 0.02 | 2.29 | 3.72 | 0.32 | 3.11 |
Wherein the chemical composition of the slag powder used in the examples and comparative examples is shown in Table 4 below
TABLE 4 chemical composition of slag powder (%)
| Material | CaO | SiO 2 | MgO | Al 2 O 3 | MnO | Fe 2 O 3 | SO 3 |
| Slag powder | 38.44 | 30.52 | 9.11 | 16.32 | 0.52 | 0.31 | 2.27 |
Wherein the chemical composition of the cement clinker used in the examples and comparative examples is shown in Table 5 below
TABLE 5 chemical composition of cement clinker (%)
| Material | CaO | MgO | Al 2 O 3 | SiO 2 | TiO 2 | Fe 2 O 3 | K 2 O | Loss on ignition |
| Cement clinker | 64.82 | 3.37 | 4.11 | 20.77 | 0.36 | 3.36 | 0.88 | 1.96 |
Wherein the chemical composition of gypsum used in examples and comparative examples is shown in Table 6 below
TABLE 6 chemical composition of gypsum (%)
| Material | Al 2 O 3 | SiO 2 | P 2 O 5 | SO 3 | K 2 O | CaO | Fe 2 O 3 | MgO | Others | Loss on ignition |
| Gypsum plaster | 1.74 | 2.46 | 0.02 | 47.6 | 0.26 | 35.13 | 0.47 | 0.47 | 1.66 | 10.02 |
Test case
The compressive strength test and the stability test of the cement were performed on the cement prepared in examples 1 to 10 and comparative examples 1 to 2, respectively.
Compressive strength test: mixing and molding are carried out according to the specification of GB/T17671-1999 "cement mortar strength test method (ISO method)", and curing in water: and (3) carrying out belt mold curing on the rubber sand test piece for 1 day in a curing box with the relative humidity not lower than 90% at the temperature of 20+/-2 ℃, then demolding, curing the demolding test piece in water at the temperature of 20+/-1 ℃ for 28 days, and testing the compressive strength.
Stability test: the setting time and stability of the cement compositions of examples 1 to 10 were tested by the Lei's clamp method according to the test method for water consumption, setting time and stability of Cement Standard consistency (GB/T1346-2011).
The test results are shown in tables 7 and 8.
Table 7 compressive strengths of the cement 3d, 7d and 28d were obtained in examples 1 to 10 and comparative examples 1 to 2.
| Compressive Strength | 3d/MPa | 7d/MPa | 28d/MPa |
| Example 1 | 21.1 | 26.3 | 37.5 |
| Example 2 | 22.3 | 27.1 | 38.7 |
| Example 3 | 20.5 | 24.8 | 35.4 |
| Example 4 | 25.5 | 36.8 | 52.6 |
| Example 5 | 34.5 | 43.3 | 61.8 |
| Example 6 | 20.4 | 24.2 | 34.5 |
| Example 7 | 25.9 | 37.6 | 53.7 |
| Example 8 | 35.6 | 46.1 | 65.8 |
| Example 9 | 26.9 | 38.9 | 55.5 |
| Example 10 | 20.1 | 26.3 | 34.5 |
| Comparative example 1 | 5.6 | 12.5 | 18.6 |
| Comparative example 2 | 1.5 | 5.5 | 7.2 |
The cementing material based on calcined clay is prepared in the embodiment of the invention, and the compressive strength is more than 20.0MPa in 3 days, more than 24.0MPa in 7 days and more than 35.0MPa in 28 days in water.
Table 8 setting times and stability of the cement made in examples 1-10.
The results show that all the examples 1-10 meet the requirements of the national standard GB175-2020 and can be used as cement.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A cementing material based on calcined clay, which is characterized by comprising a base material and an alkaline activator, wherein the base material comprises the following components in percentage by mass: 30-70% of calcined clay, 0-30% of steel slag, 10-70% of slag powder, 0-25% of cement clinker and 0-5% of gypsum.
2. The calcined clay-based cement according to claim 1, wherein the alkaline activator comprises one or more of calcium formate, calcium lignosulfonate, sodium sulfate, calcium chloride, sodium carbonate, sodium silicate, sodium hydroxide; preferably, the alkaline auxiliary activator comprises the following components in percentage by mass of 1-3: 9 to 11:0.3 to 0.8 of calcium formate, sodium hydroxide and sodium silicate.
3. The calcined clay-based cement according to claim 1, wherein the alkali-activator is present in an amount of 0.1 to 10% by mass of the binder; preferably, the alkaline excitant accounts for 5-7% of the mass of the base material.
4. The calcined clay-based cement according to claim 1, wherein the binder is made from the following raw materials in mass percent: 30-60% of calcined clay, 3-30% of steel slag, 30-60% of slag, 4-25% of cement clinker and 0-5% of gypsum.
5. The calcined clay-based cement according to claim 4, wherein the binder is made from the following raw materials in mass percent: 30-60% of calcined clay, 3-5% of steel slag, 30-60% of slag, 4-6% of cement clinker and 0.5-2% of gypsum.
6. The calcined clay-based cement according to claim 1, wherein Al in the calcined clay 2 O 3 >15％，Al/Si>0.3，CaO<3％，SO 3 <3%; preferably, al in the calcined clay 2 O 3 The content is more than or equal to 20 percent, and the compressive strength activity index is higher than 80 percent in 28 days;more preferably, the chemical components of the calcined clay comprise, in mass percent: al (Al) 2 O 3 ：25～40％，SiO 2 ：60～75％，K 2 O+Na 2 O≤3％，CaO+MgO≤5％，SO 3 <3％。
7. The calcined clay-based cement according to claim 1, wherein the steel slag has a CaO mass content of 30 to 60% and SiO 2 10 to 30 percent of MgO, 2 to 20 percent of Fe 2 O 3 The mass content is 10-40%; preferably, the steel slag comprises the following chemical components in percentage by mass: 38 to 50 percent of Fe 2 O 3 ：25～35％、SiO 2 ：14～20％、MgO：4.5～12％、MnO：≤5％、Al 2 O 3 ：1-10％、CaF 2 ≤2％、SO 3 ≤5％。
8. The calcined clay-based cement according to claim 1, wherein the slag is water quenched or air cooled blast furnace slag; and/or, the cement clinker is silicate cement clinker; and/or the gypsum is selected from at least one of desulfurized gypsum, mirabilite gypsum, phosphogypsum and titanium gypsum.
9. A method for preparing a calcined clay-based cementitious material according to any one of claims 1 to 8, wherein the components in the base material are weighed, mixed with an alkaline activator, and ground to obtain the calcined clay-based cementitious material.
10. The method for preparing a calcined clay-based cement according to claim 9, wherein the powder obtained by the grinding process is further sieved with square holes of 60-100 μm, and the sieving amount of the powder is 0-10%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311407617.0A CN117417135A (en) | 2023-10-27 | 2023-10-27 | Cementing material based on calcined clay and preparation method thereof |
| ZA2023/11749A ZA202311749B (en) | 2023-10-27 | 2023-12-21 | Cementing material based on calcined clay and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311407617.0A CN117417135A (en) | 2023-10-27 | 2023-10-27 | Cementing material based on calcined clay and preparation method thereof |
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| CN118420253A (en) * | 2024-02-24 | 2024-08-02 | 湖南科技大学 | Preparation method of low-carbon universal cement |
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| CN118420253A (en) * | 2024-02-24 | 2024-08-02 | 湖南科技大学 | Preparation method of low-carbon universal cement |
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