Lightweight high-alkali-excitation partition board and preparation method thereof

Abstract

The invention relates to the technical field of building materials, in particular to a light high-alkali activated partition board and a preparation method thereof. The partition board is prepared from the following raw materials: cement, fly ash, slag, furnace slag, a composite activator, EPS particles, an additive and water, the mass fraction of the cement is 10%-20%, the mass fraction of the fly ash is 5%-20%, the mass fraction of the slag is 2%-10%, the mass fraction of the furnace slag is 60%-90%, and the mass fraction of the composite The EPS particles account for 0-5% of the total volume of the cement, the fly ash, the slag, the furnace slag and the composite exciting agent, the additive accounts for 0-0.5% of the total mass fraction of the cement, the fly ash, the slag and the composite exciting agent, and the water accounts for 10-15% of the total mass fraction of the cement, the fly ash, the slag, the furnace slag and the composite exciting agent. The partition board has the characteristics of light weight, high strength and good durability, shows excellent comprehensive performance, and can well meet the use requirements of building materials.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a lightweight and high-strength alkali-activated partition board and a preparation method thereof. Background Art

[0002] As an important part of building materials, the performance and application scope of partition boards directly affect the overall performance and construction efficiency of buildings. In recent years, with the rapid development of the construction industry and the continuous improvement of environmental protection requirements, the technological innovation and market application of partition board materials have received extensive attention. In particular, lightweight and high-strength partition boards have gradually become ideal substitutes for traditional building materials due to their excellent heat insulation, sound insulation, fire protection, and environmental protection characteristics. However, despite the significant progress made in partition board technology in recent years, there are still many challenges in its actual application. In actual application, the problems of partition boards mainly focus on the following two aspects: First, the strength and durability of partition boards are relatively low, especially in terms of compressive strength and impact resistance, making it difficult to meet the requirements of high-rise buildings and complex environments. Second, although partition boards have advantages in sound insulation and heat insulation, their overall performance still needs to be further improved to better adapt to different climate conditions and building requirements, especially for environments with large day-night temperature differences.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a lightweight and high-strength alkali-activated partition board and a preparation method thereof, aiming to solve the problem of relatively low strength and durability of existing partition boards.

[0005] The technical solution of the present invention is as follows:

[0006] In the first aspect of the present invention, a lightweight and high-strength alkali-activated partition board is provided, which is prepared from the following raw materials: cement, fly ash, slag, furnace slag, composite activator, EPS particles, admixture, and water;

[0007] The total mass fraction of the cement, fly ash, slag, furnace slag, and composite activator is 100%, wherein the mass fraction of the cement is 10% - 20%, the mass fraction of the fly ash is 5% - 20%, the mass fraction of the slag is 2% - 10%, the mass fraction of the furnace slag is 60% - 90%, and the mass fraction of the composite activator is 2% - 10%;

[0008] The dosage of the EPS particles is 0 - 5% of the total volume fraction of cement, fly ash, slag, furnace slag and composite activator. The dosage of the admixture is 0 - 0.5% of the total mass fraction of cement, fly ash, slag and composite activator. The dosage of water is 10% - 15% of the total mass fraction of cement, fly ash, slag, furnace slag and composite activator.

[0009] Optionally, the composite activator includes carbide slag, mirabilite and desulfurized ash.

[0010] Optionally, the mass ratio of the carbide slag, mirabilite and desulfurized ash is 1 - 2:1 - 2:1 - 2.

[0011] Optionally, the admixture includes polycarboxylate superplasticizer, polypropylene fiber and hydroxymethyl cellulose.

[0012] Optionally, the mass fraction of the polycarboxylate superplasticizer is 0.1% - 0.2% of the total mass fraction of cement, fly ash, slag and composite activator. The mass fraction of the polypropylene fiber is 0 - 0.2% of the total mass fraction of cement, fly ash, slag and composite activator. The mass fraction of the hydroxymethyl cellulose is 0.1% - 0.2% of the total mass fraction of cement, fly ash, slag and composite activator.

[0013] Optionally, the particle size of the EPS particles is 0.5 mm - 2 mm.

[0014] In the second aspect of the present invention, a preparation method of a lightweight and high-strength alkali-activated partition board is provided, which includes:

[0015] Step S1: Weigh each raw material according to the set dosage for standby;

[0016] Step S2: Mix and stir cement, fly ash, slag, furnace slag, composite activator, EPS particles, admixture and water to obtain a mixed slurry;

[0017] Step S3: Put the mixed slurry into a mold for molding, and obtain the lightweight and high-strength alkali-activated partition board after curing and demolding.

[0018] Optionally, the specific content of step S2 includes:

[0019] Mix and stir cement, fly ash, slag and furnace slag for 10 min - 30 min, then add the composite activator and mix and stir for 5 min - 10 min, then add the EPS particles and mix and stir for 5 min - 10 min, then add the admixture and mix and stir for 5 min - 10 min, and finally add water and mix and stir for 5 min - 10 min to obtain a uniform mixed slurry.

[0020] Optionally, in step S3, the forming is carried out in a partition board forming machine, and the pouring speed is controlled to be 0.8 m / min - 2.8 m / min.

[0021] Optionally, in step S3, the curing conditions include: temperature of 20°C - 30°C, humidity of 80% - 100%, and time of 1 - 28 days.

[0022] Beneficial effects: First, the present invention uses fly ash and slag with pozzolanic activity as raw materials, and under the action of a composite activator, the precursor is composite-activated through alkali activation reaction and pozzolanic reaction. SiO 2 and Al 2 O 3 on the surfaces of fly ash and slag raw materials are dissolved, the Si-O bond and Al-O bond are broken, forming orthosilicic acid and aluminosilicic acid, and then they come into contact with each other in the liquid phase and undergo a polycondensation reaction to form geopolymers gel with a certain spatial network structure. The geopolymers gel gradually hardens and forms a zeolite-like structure to improve the strength of the material. Combining the early strength characteristics of cement itself and the lightweight and heat-insulating characteristics of EPS particles, a lightweight and high-strength partition board material is obtained. Second, the present invention uses a large amount of solid waste as raw materials, such as fly ash, slag, furnace slag, etc., which can effectively reduce production costs and carbon emissions, improve environmental benefits, and conform to the green development trend of modern building materials. Third, the lightweight and high-strength alkali-activated partition board provided by the present invention has the characteristics of lightweight, high strength and good durability, shows excellent comprehensive performance, and can well meet the use requirements of building materials. Specific embodiments

[0023] The present invention provides a lightweight and high-strength alkali-activated partition board and its preparation method. To make the purpose, technical solution and effects of the present invention clearer and more definite, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] An embodiment of the present invention provides a lightweight and high-strength alkali-activated partition board, which is prepared from the following raw materials: cement, fly ash, slag, furnace slag, composite activator, EPS particles, admixture and water;

[0025] The total mass fraction of the cement, fly ash, slag, furnace slag and composite activator is 100%, wherein the mass fraction of cement is 10% - 20%, the mass fraction of fly ash is 5% - 20%, the mass fraction of slag is 2% - 10%, the mass fraction of furnace slag is 60% - 90%, and the mass fraction of the composite activator is 2% - 10%;

[0026] The dosage of the EPS particles is 0-5% of the total volume fraction of cement, fly ash, slag, furnace slag and composite activator; the dosage of the admixture is 0-0.5% of the total mass fraction of cement, fly ash, slag and composite activator; the dosage of water is 10%-15% of the total mass fraction of cement, fly ash, slag, furnace slag and composite activator.

[0027] In the embodiments of the present invention, by designing the raw materials of each component and their dosages, first, the total mass fraction of cement, fly ash, slag, furnace slag and composite activator is set to 100%, wherein the mass fraction of cement is 10%-20% (preferably 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%); the mass fraction of fly ash is 5%-20% (preferably 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%); the mass fraction of slag is 2%-10% (preferably 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%); the mass fraction of furnace slag is 60%-90% (preferably 60%, 65%, 70%, 75%, 80%, 85%, 90%); the mass fraction of the composite activator is 2%-10% (preferably 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%); then, 0-5% volume fraction of EPS particles (preferably 1%, 2%, 3%, 4%, 5%) is added based on the total volume fraction of cement, fly ash, slag, furnace slag and composite activator; 0-0.5% mass fraction of the admixture (preferably 0.1%, 0.2%, 0.3%, 0.4%, 0.5%) is added based on the total mass fraction of cement, fly ash, slag and composite activator; and 10%-15% mass fraction of water (preferably 10%, 11%, 12%, 13%, 14%, 15%) is added based on the total mass fraction of cement, fly ash, slag, furnace slag and composite activator; finally, the lightweight and high-strength alkali-activated partition board is obtained.

[0028] The cement in the embodiments of the present invention is used as a gelling material and has an early strength enhancing effect; fly ash and slag are used as alkali-activation precursors to provide active SiO 2 、Al 2 O 3and CaO; the composite activator preferably includes carbide slag, mirabilite and desulfurized ash. As an alkaline activator and a sulfate activator, the three activators can react with each other to generate a substance with better alkalinity, which can more rapidly activate the alkali-activated precursor; slag and EPS particles are used as the aggregate and lightweight aggregate of the partition board respectively; the admixture preferably includes polycarboxylate superplasticizer, polypropylene fiber and hydroxymethyl cellulose. Among them, the polycarboxylate superplasticizer can reduce the water consumption of the material and improve the strength, the polypropylene fiber can increase the toughness and improve the flexural performance, and the hydroxymethyl cellulose can increase the viscosity and stabilize the structure of the alkali-activated material. Through these raw materials, the lightweight and high-strength alkali-activated partition board is finally prepared in the embodiments of the present invention.

[0029] In the embodiments of the present invention, fly ash and slag with pozzolanic activity are used as raw materials, and a special composite activator (preferably including carbide slag, mirabilite and desulfurized ash) is introduced. Under the action of the composite activator, the precursor is composite-activated through alkali activation reaction and pozzolanic reaction. The SiO 2 and Al 2 O 3 on the surfaces of fly ash and slag raw materials are dissolved, the Si-O bond and Al-O bond are broken, orthosilicic acid and aluminosilicic acid are formed, and then they come into contact with each other in the liquid phase and undergo a polycondensation reaction to form a geopolymer gel with a certain spatial network structure. The geopolymer gel gradually hardens and forms a zeolite-like structure to improve the strength of the material. Combining with the early strength characteristics of cement itself and the lightweight characteristics of EPS particles, a lightweight and high-strength partition board material is obtained. The present invention uses the polymerization technology in alkali-activated materials to generate N-A-S-H gel (geopolymer gel) with better hydrated products, combines with ettringite and calcium silicate hydrate gel generated by the early hydration of cement to achieve the effect of early strength, and then adds an appropriate amount of EPS to reduce the density and achieve the effect of heat preservation. During the hydration process, EPS and hydrated products are bonded tightly to form a hard whole.

[0030] The principle of action of the composite activator in the embodiments of the present invention is as follows: the carbide slag, mirabilite and desulfurized ash in the composite activator undergo an ion exchange reaction to generate a substance with stronger alkalinity. The alkaline substance ionizes hydroxide ions in water, which can dissolve the active components in the raw materials (such as SiO 2 and Al 2 O 3 ), and promote their chemical reactions to break the Si-O bond and Al-O bond. The dissolved Si ions and Al ions undergo a polycondensation reaction in the liquid phase to form a geopolymer gel. The geopolymer gel gradually hardens and forms a zeolite-like structure, which improves the strength and durability of the material.

[0031] Compared with the existing partition boards, the technical advantages of the lightweight and high-strength alkali-activated partition board in the embodiments of the present invention include:

[0032] (1) The partition board of the present invention is lightweight and high-strength, showing excellent comprehensive performance and meeting the usage requirements of building materials.

[0033] (2) A large amount of solid waste is used as raw materials in the partition board of the present invention, such as fly ash, slag, furnace slag, etc. Therefore, the production cost and carbon emissions can be effectively reduced, the environmental benefits can be improved, and it conforms to the green development trend of modern building materials.

[0034] (3) The partition board of the present invention utilizes alkali-activated materials and geopolymer gels. Compared with the gels formed by cement materials, it is more stable in structure, has stronger corrosion resistance, has better effects in durability, can extend the service life of the product, and can prepare lightweight and early-strength partition board materials by using the polymerization technology of composite activators combined with the early-strength characteristics of cement itself and the excellent bonding properties of EPS, reducing building energy consumption.

[0035] (4) The partition board of the present invention can effectively reduce the density of the product while maintaining the strength unchanged, and the fiber reinforcement improves the impact resistance and crack resistance of the partition board. It will provide a new way for the resource utilization of various solid wastes.

[0036] In some embodiments, the composite activator includes carbide slag, mirabilite, and desulfurized ash. Preferably, the mass ratio of carbide slag, mirabilite, and desulfurized ash is 1-2:1-2:1-2. The preparation method of the composite activator is: weigh carbide slag, mirabilite, and desulfurized ash according to the mass ratio, and mix and stir evenly to obtain. Mix and stir the composite activator to ensure the uniformity and activity of the activator.

[0037] In some embodiments, the admixture includes polycarboxylate water reducer, polypropylene fiber, and carboxymethyl cellulose.

[0038] In some embodiments, the mass fraction of the polycarboxylate water reducer is 0.1%-0.2% of the total mass fraction of cement, fly ash, slag, and composite activator, the mass fraction of the polypropylene fiber is 0-0.2% of the total mass fraction of cement, fly ash, slag, and composite activator, and the mass fraction of the carboxymethyl cellulose is 0.1%-0.2% of the total mass fraction of cement, fly ash, slag, and composite activator.

[0039] The cement used in the embodiments of the present invention is P.O.42.5 cement, which conforms to the general Portland cement standard of GB175-2007; the fly ash, slag, carbide slag, mirabilite, and furnace slag used are solid wastes generated industrially, and are all obtained through procurement to ensure that their quality meets the relevant standards.

[0040] In some embodiments, the slag and fly ash used have a moderate fineness, with a particle size of 50 μm - 150 μm; the EPS particles used have a particle size of 0.5 mm - 2 mm to ensure their light weight; the admixtures (polycarboxylate water reducer, polypropylene fiber with a length of 0.5 cm - 1 cm, and carboxymethyl cellulose) are selected with appropriate lengths and contents to ensure their uniform distribution in the material.

[0041] The embodiment of the present invention also provides a preparation method of the lightweight and high-strength alkali-activated partition board described in any one of the foregoing embodiments, which includes:

[0042] Step S1: Weigh each raw material according to the set dosage for standby;

[0043] Step S2: Mix and stir cement, fly ash, slag, furnace slag, composite activator, EPS particles, admixtures, and water to obtain a mixed slurry;

[0044] Step S3: Put the mixed slurry into a mold for molding, and obtain the lightweight and high-strength alkali-activated partition board after curing and demolding.

[0045] The preparation process of the lightweight and high-strength alkali-activated partition board provided by the embodiment of the present invention is simple, can achieve mass production, and the prepared lightweight and high-strength alkali-activated partition board has the characteristics of light weight, high strength, and good durability, showing excellent comprehensive performance and can well meet the use requirements of building materials.

[0046] In some embodiments, step S2 specifically includes:

[0047] Mix and stir cement, fly ash, slag, and furnace slag for 10 min - 30 min, then add the composite activator and mix and stir for 5 min - 10 min, then add EPS particles and mix and stir for 5 min - 10 min, then add the admixtures and mix and stir for 5 min - 10 min, and finally add water and mix and stir for 5 min - 10 min to obtain a uniform mixed slurry.

[0048] In some embodiments, in step S3, the molding is carried out in a partition board molding machine, and the pouring speed is controlled at 0.8 m / min - 2.8 m / min to avoid generating too many bubbles.

[0049] In some embodiments, in step S3, the curing conditions include: temperature is 20°C - 30°C, humidity is 80 - 100%, and time is 1 - 28 days.

[0050] The present invention will be further described below through specific embodiments.

[0051] Examples 1 - 9

[0052] Prepare lightweight high-strength alkali-activated partition boards in the following steps:

[0053] (1) Weigh the raw materials in the amounts shown in Table 1 for later use;

[0054] (2) Mix cement, slag, fly ash and slag for 10 minutes to ensure that all raw materials are fully mixed; then slowly add the composite activator (carbide slag, sodium sulfate and desulfurization ash) while stirring for 5 minutes to ensure that the mixture is evenly mixed; then add EPS particles and mix for 5 minutes to ensure that the EPS is fully mixed and there is no agglomeration; then add admixtures (polycarboxylic acid water reducer, polypropylene fiber and hydroxymethyl cellulose) and mix for 5 minutes to ensure that the admixtures are evenly distributed in the mixture and there is no agglomeration; finally, add water to the mixture and stir for 10 minutes to obtain a uniform mixed slurry.

[0055] (3) Pour the mixed slurry obtained in step (2) into a partition board forming machine, control the pouring speed to 2.8 m / min, and ensure that the mixed slurry is evenly distributed in the forming machine without bubbles.

[0056] (4) The formed partition board is cured for 28 days at 20°C and 90% humidity. During the curing process, the state of the partition board is regularly checked to ensure that it is fully reacted and hardened. The curing environment should be kept clean to avoid dust and pollutants that affect the material properties. After the curing is completed, the partition board is demolded from the mold to obtain a lightweight high-strength alkali-activated partition board.

[0057] Table 1

[0058]

[0059]

[0060] In Table 1, the total mass fraction of cement, fly ash, slag, slag and composite activator (carbide slag, sodium sulfate and desulfurization ash) is 100%, the amount of EPS particles is the volume fraction relative to the total volume fraction of cement, fly ash, slag, slag and composite activator, the amount of admixtures (polycarboxylate water reducer, polypropylene fiber and hydroxymethyl cellulose) is the mass fraction relative to the total mass fraction of cement, fly ash, slag and composite activator, and the amount of water is the mass fraction relative to the total mass fraction of cement, fly ash, slag, slag and composite activator.

[0061] Comparative Example 1

[0062] The preparation method of Comparative Example 1 is the same as that of Example 1, except that the raw materials are replaced with 40% cement, 20% fly ash, 40% slag, 2% EPS, 0.2% naphthalene-based water reducer and 0.2% aluminum sulfate (accelerator), and finally a partition board is prepared.

[0063] Comparative Example 2

[0064] The preparation method of Comparative Example 2 is the same as that of Example 1, except that the raw materials are replaced with 60% cement, 40% fly ash, 10% EPS, 0.2% naphthalene-based water reducer and 0.2% aluminum sulfate (accelerator), and finally a partition board is prepared.

[0065] Comparative Example 3

[0066] The preparation method of Comparative Example 3 is the same as that of Example 1, except that the raw materials are replaced with 40% cement, 30% fly ash, 30% construction waste, 10% triterpenoid saponin (foaming agent) and 0.2% xanthan gum (foam stabilizer), and finally a partition board is prepared.

[0067] Performance tests were carried out on the partition boards prepared in the above Examples 1-9 and Comparative Examples 1-3. Among them, the reference standard for compressive strength is GB / T 17671-1999 "Test Method for Cement Mortar Strength (ISO Method)". The specific method is to take multiple 40mm×40mm×40mm partition boards for testing and calculate the average value of compressive strength; the density test method is to dry the partition board at 105°C until the weight change rate is less than 0.2%, and density = M / V×10 6 , where M is the mass (g) of the partition board after drying, and V is the volume (mm 3 ).

[0068] Table 2

[0069]

[0070]

[0071] It can be seen from the data in Table 2 that the lightweight and high-strength alkali-activated partition board of the present invention has good compressive strength and density, showing excellent comprehensive performance. Especially compared with the comparative examples, the partition board of the present invention is lighter, and the alkali-activation reaction and pozzolanic reaction of the composite activator are used to compound and activate the precursor, improving the utilization rate of industrial waste. In addition, the lightweight and high-strength alkali-activated partition board of the present invention also has good durability, and the number of times of resistance to acid (3%), chloride salt (5%), and sulfate (5%) ≥ 50 times.

[0072] In summary, the lightweight and high-strength alkali-activated partition board provided by the present invention is prepared from specific mass fractions of cement, fly ash, slag, furnace slag, composite activator, EPS particles, admixture and water as raw materials, and has the characteristics of being lightweight, high-strength and good durability, showing excellent comprehensive performance, and can well meet the use requirements of building materials.

[0073] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or modifications can be made according to the above description, and all such improvements and modifications shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A lightweight high-strength alkali-activated partition board, characterized in that: The method is prepared from the following raw materials: cement, fly ash, slag, slag, composite activator, EPS particles, admixture and water; The total mass fraction of the cement, fly ash, slag, slag and composite activator is 100%, wherein the mass fraction of cement is 10%-20%, the mass fraction of fly ash is 5%-20%, the mass fraction of slag is 2%-10%, the mass fraction of slag is 60%-90%, and the mass fraction of the composite activator is 2%-10%; The amount of EPS particles used is 0-5% of the total volume fraction of cement, fly ash, slag, slag and composite activator, the amount of admixture used is 0-0.5% of the total mass fraction of cement, fly ash, slag and composite activator, and the amount of water used is 10%-15% of the total mass fraction of cement, fly ash, slag, slag and composite activator.

2. The lightweight high-strength alkali-activated partition board according to claim 1 is characterized in that: The composite activator comprises carbide slag, sodium sulfate and desulfurization ash.

3. The lightweight high-strength alkali-activated partition board according to claim 2 is characterized in that: The mass ratio of the carbide slag, sodium sulfate and desulfurization ash is 1-2:1-2:1-2.

4. The lightweight high-strength alkali-activated partition board according to claim 1 is characterized in that: The additives include polycarboxylate water reducer, polypropylene fiber and hydroxymethyl cellulose.

5. The lightweight high-strength alkali-activated partition board according to claim 4 is characterized in that: The mass fraction of the polycarboxylate water-reducing agent is 0.1%-0.2% of the total mass fraction of cement, fly ash, slag and composite activator, the mass fraction of the polypropylene fiber is 0-0.2% of the total mass fraction of cement, fly ash, slag and composite activator, and the mass fraction of the hydroxymethyl cellulose is 0.1%-0.2% of the total mass fraction of cement, fly ash, slag and composite activator.

6. The lightweight high-strength alkali-activated partition board according to claim 1 is characterized in that: The particle size of the EPS particles is 0.5 mm-2 mm.

7. A method for preparing a lightweight high-strength alkali-activated partition board according to any one of claims 1 to 6, characterized in that: include: Step S1, weighing each raw material according to the set amount for use; Step S2, mixing cement, fly ash, slag, slag, composite activator, EPS particles, admixture and water to obtain a mixed slurry; Step S3, placing the mixed slurry into a mold for molding, and obtaining the lightweight and high-strength alkali-activated partition board after curing and demoulding.

8. The method for preparing a lightweight high-strength alkali-activated partition board according to claim 7, characterized in that: The step S2 specifically includes: Mix cement, fly ash, slag and furnace slag for 10min-30min, then add composite activator and mix for 5min-10min, then add EPS particles and mix for 5min-10min, then add admixture and mix for 5min-10min, finally add water and mix for 5min-10min to obtain a uniform mixed slurry.

9. The method for preparing a lightweight high-strength alkali-activated partition board according to claim 7, characterized in that: In the step S3, the forming is carried out in a partition board forming machine, and the pouring speed is controlled to be 0.8m / min-2.8m / min.

10. The method for preparing a lightweight high-strength alkali-activated partition board according to claim 7, characterized in that: In step S3, the curing conditions include: temperature of 20°C-30°C, humidity of 80%-100%, and time of 1-28 days.

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