Unfired building block prepared from water granulated slag and stone powder as raw materials and preparation method of unfired building block

Abstract

The invention provides an unfired building block prepared by taking water granulated slag and stone powder as raw materials, and belongs to the technical field of building material preparation, the unfired building block is prepared from the following raw materials in percentage by mass: 5-15% of cement, 5-15% of fly ash, 5-15% of fly ash, 5-15% of fly ash, 5-15% of fly ash and the balance of water. 1-10% of fly ash; 0.05%-3% of an exciting agent and the balance of stone powder and a basic water granulated slag complex; wherein the mass ratio of the stone powder to the basic water granulated slag complex is (5: 1)-(1: 5); the basic water granulated slag complex is a mixture of coarse water granulated slag particles and fine water granulated slag particles in a mass ratio of (1: 4)-(4: 1). According to the unfired building block, the water granulated slag and the stone powder serve as basic raw materials of the building block, production of the building block is achieved under the condition that damage of clay and gravel mining to the environment is reduced, waste recycling treatment can be achieved at the same time, and the purposes of carbon reduction and environment friendliness of engineering are achieved. The invention also provides a preparation method of the unfired building block prepared by taking the water granulated slag and the stone powder as raw materials.

Description

Technical Field

[0001] The invention belongs to the technical field of building material preparation, and particularly relates to a fire-free building block prepared with slag and stone powder as raw materials and a preparation method thereof. Background Art

[0002] With the rapid development of the national economy, the rapid development of the national steel industry and large-scale infrastructure industries has played a driving role in the country's economy.

[0003] In the process of preparing raw materials (especially artificial sand and gravel) in large-scale infrastructure industry, a large amount of leftover materials will be left, occupying a large surface area. If these piles are not properly handled, they may also damage and pollute the surface soil in the accumulation area, so it is necessary to dispose of such leftover materials scientifically and reasonably.

[0004] A large amount of slag is produced during the production process of the steel industry. Although this slag can be used, most of it is still disposed of in piles due to problems such as disposal efficiency and application. This not only creates environmental and safety risks, but also wastes a lot of land resources.

[0005] The above slag and stone powder are wastes in themselves and need to be properly disposed of to avoid potential threats to the local environment. However, if the waste is used as a solid resource through reasonable utilization, it will not only help reduce the volume of such wastes, but also realize the resource application of wastes, reduce the environmental damage caused by mining, and is consistent with the country's "carbon reduction, green" development policy. Summary of the invention

[0006] In order to solve the problem that building materials or steel waste is difficult to effectively treat, the present invention provides a fire-free building block prepared with slag and stone powder as raw materials. The fire-free building block uses slag and stone powder as the basic raw materials of the building block, reduces the damage to the environment caused by clay and sand and gravel mining, and can also realize the resource disposal of waste, achieving the purpose of "carbon reduction" and "green" engineering.

[0007] The invention also provides a method for preparing a fire-free building block using slag and stone powder as raw materials.

[0008] The present invention is achieved through the following technical solutions:

[0009] The present invention provides a fire-free building block prepared with slag and stone powder as raw materials. The raw materials for manufacturing the fire-free building block include the following materials by mass fraction:

[0010] Cement: 5%-15%; fly ash: 1-10%; activator: 0.05%-3%, the balance is stone powder and basic water slag mixture;

[0011] Wherein, the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5;

[0012] The basic water-slag mixture is a mixture of coarse water-slag particles and fine water-slag particles in a mass ratio of 1:4 to 4:1.

[0013] Furthermore, the coarse water slag particles are water slag particles with a particle size of less than 100 mesh, and the fine water slag particles are water slag particles with a particle size of ≥ 100 mesh;

[0014] The stone powder has a particle size of 0.5-5 mm, and the stone powder includes at least one of quartz particles, feldspar particles and limestone particles.

[0015] Furthermore, the raw materials for manufacturing the fire-free building blocks also include water, wherein the weight of the water is 8%-15% of the total weight of the solid-phase raw materials for manufacturing the fire-free building blocks.

[0016] Based on the same inventive concept, the present invention also provides a method for preparing a fire-free building block using slag and stone powder as raw materials, the method comprising:

[0017] The water slag is crushed and screened into water slag particles of coarse and fine particle sizes;

[0018] The coarse water slag particles and the fine water slag particles are mixed in a mass ratio of 1:4 to 4:1 to obtain a basic water slag compound;

[0019] Add stone powder to the basic water-slag mixture and mix well, wherein the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain a main base material for building blocks;

[0020] Adding cement, fly ash and an activator to the main base material of the building block and mixing them evenly to obtain a building block solid phase material;

[0021] Water is added to the solid phase material of the building block, and the unfired building block is obtained after forming.

[0022] Furthermore, the crushing of the slag into coarse and fine slag particles specifically includes:

[0023] The water slag with a moisture content lower than 15% is crushed and passed through a 100-mesh sieve to obtain water slag particles of coarse and fine particle sizes, wherein the particles on the 100-mesh sieve are coarse water slag particles, and the particles below the 100-mesh sieve are fine water slag particles.

[0024] Furthermore, the stone powder is added to the basic water-slag mixture and mixed, and the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain the main base material of the block, which specifically includes:

[0025] Add stone powder with a particle size of 0.5-5 mm to the basic water-slag mixture and mix well, wherein the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain a main base material for building blocks;

[0026] Wherein, the stone powder is rock particles.

[0027] Preferably, the rock particles include at least one of quartz particles, feldspar particles and limestone particles.

[0028] Furthermore, the cement is silicate cement or aluminate cement.

[0029] Furthermore, the activator is a mixture of alkaline substances and water-soluble rubber powder.

[0030] Furthermore, the step of adding water to the solid phase material of the building block to obtain the fire-free building block after forming includes:

[0031] Water is added to the solid phase material of the building block, and the building block is formed by a static pressure or vibration forming machine to obtain a fire-free building block.

[0032] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0033] 1. The present invention discloses a fire-free building block prepared with slag and stone powder as raw materials. The fire-free building block uses industrial waste slag and stone powder as basic raw materials for building blocks, thereby solving the pollution of the environment and land occupation by waste, realizing the resource application of waste, and reducing the production cost of the blocks.

[0034] 2. The present invention discloses a fire-free building block prepared with slag and stone powder as raw materials. The main base material of the block obtained by mixing stone powder and slag with different particle size ratios in a certain proportion has a certain density and strength. Cement is added as a binder between the raw materials, and an activator is added. The activator is a mixture of an alkaline activator and a water-soluble glue powder. The alkaline activator promotes a chemical reaction between fine slag particles and coarse slag surfaces in the late stage of cement hydration to form new hydrated silicate, thereby further improving the density of the block. The water-soluble glue powder forms a cross-network structure in the block, which further improves the density while enhancing the shear resistance of the masonry. Improve the waterproofness of the blocks, reduce the water absorption, shrinkage and carbonization rate of the blocks. The resulting building blocks do not require high-temperature sintering, and are more low-carbon and environmentally friendly. Fly ash plays two main roles in the system: First, as a fine particle-grade ingredient, it fills the tiny pores of the system during the primary hydration of the system to increase the density of the system and improve the early compressive strength of the system; second, as an active substance, it reacts with the hydration products in the system for a secondary hydration reaction, consuming the calcium hydroxide in the primary hydration products while forming calcium silicate secondary hydration products, which are further filled in the pores of the system, thereby improving the carbonization resistance of the product and the later compressive strength of the system.

[0035] 3. The present invention discloses a method for preparing unfired building blocks using slag and stone powder as raw materials. The method uses industrial waste slag and stone powder as basic raw materials for building blocks, thereby solving the environmental pollution and land occupation caused by waste, realizing the resource application of waste, reducing the production cost of blocks, and also reducing the damage to the environment caused by clay and sand and gravel mining, thereby achieving the purpose of "carbon reduction" and "green" engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is the hollow block model prepared in Example 1.

[0038] Figure 2 This is the XRD test diagram of the hollow block module of Example 1 after curing for 28 days.

[0039] Figure 3 The following are scanning electron microscope photos of the hollow blocks in Examples 1, 2, 3 and 4 after curing for 28 days. DETAILED DESCRIPTION

[0040] The present invention will be described in detail below in conjunction with specific implementations and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific implementations and examples are used to illustrate the present invention, rather than to limit the present invention.

[0041] Throughout the specification, unless otherwise specifically stated, the terms used herein should be understood as meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. In the event of a conflict, the present specification takes precedence.

[0042] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0043] The following will describe in detail the fire-free building blocks prepared with slag and stone powder as raw materials and the preparation method thereof in combination with the embodiments and experimental data.

[0044] Example 1

[0045] The present embodiment provides a method for preparing a fire-free building block using slag and stone powder as raw materials, comprising:

[0046] (1) The water slag with a moisture content of less than 15% is crushed by a pulverizer. After the water slag is crushed, it is screened into coarse and fine water slag particles according to the coarse and fine particle sizes. Specifically, the coarse and fine particle sizes are screened respectively through a 100-mesh vibrating screen, and the 100-mesh screen is 0.150 mm. When screening the coarse and fine particle sizes: the particles above the 100-mesh screen are coarse particles; the particles below the 100-mesh screen are fine particles.

[0047] (2) mixing the water slag particles in a ratio of coarse to fine particles in a range of 1:4 to 4:1 to obtain a basic water slag mixture;

[0048] By matching different particle sizes, the basic water-slag mixture can have better density characteristics. If the particles are too fine, more water will need to be added later, which will affect the hydration of cement added to the blocks later and will be detrimental to the strength of the blocks. If the particles are too coarse, the pores are large and numerous, and a dense structure cannot be formed, which will reduce the strength of the blocks.

[0049] (3) adding stone powder particles to the basic water-slag mixture, wherein the stone powder particles and the basic water-slag mixture are mixed in a ratio of 5:1-1:5 to obtain a main base material for building blocks;

[0050] The specific mixing ratio of stone powder particles and basic water-slag mixture can be determined according to the actual required strength and cost of the blocks. For example, if the blocks are used in scenarios where they do not need to bear weight and the strength requirements of the blocks are not high, more basic water-slag mixture particles can be added, and the number of coarse water-slag particles in the basic water-slag mixture can also be increased, which helps to reduce the bulk density of the blocks. If the blocks are used in scenarios where they need to bear weight, the requirements for stone powder components will be higher, and the number of fine water-slag particles in the basic water-slag mixture will also need to be increased.

[0051] (4) Add cement, fly ash and an activator to the main base material of the building block, and mix them well to obtain a building block solid phase material.

[0052] In the cement, the cement is common silicate or aluminate cement, which can be a single type or a mixture of the two in different proportions. The added amount of cement is 5%-15% of the total mass of the solid raw material, and the added amount of fly ash is 1%-10% of the total mass of the solid raw material.

[0053] The activator is a mixture of alkaline substances and water-soluble glue powder: the alkaline substance can be used as an activator of active substances in water slag, promoting chemical reactions on the surface of fine water slag particles and coarse water slag in the late stage of cement hydration to form new hydrated silicates, thereby further increasing the density of the blocks; the water-soluble glue powder forms a cross-network structure in the masonry, further increasing the density while enhancing the shear resistance of the masonry, improving the waterproofness of the blocks, and reducing the water absorption rate, shrinkage rate and carbonization rate of the blocks. The amount of the activator added in the present invention is 0.05%-3% of the mass of the solid phase material.

[0054] (5) Adding 5% to 15% of the total weight of the solid phase to the mixed solid phase, and then further mixing and stirring to form a block mixture with a certain viscosity and humidity.

[0055] (6) The block mixture is formed by a static pressure or vibration forming machine and cured naturally or by sprinkling water for 7 days to obtain the required fire-free building blocks.

[0056] Example 2

[0057] This embodiment is a preferred embodiment, and its details are as follows:

[0058] According to the ratio of 1:1, weigh 10kg each of coarse and fine slag; weigh 10kg of stone powder, 3kg of cement, 0.0510kg of activator, 1kg of fly ash and 3kg of water.

[0059] The above solid phase components are preliminarily mixed evenly with a mixer, and the liquid phase is added to the preliminarily mixed solid phase by spraying. During the adding process, the solid phase and the liquid phase are further stirred to mix evenly. The mixed materials are formed into a hollow block model (such as Figure 1 ) for forming, and then covered with film and cured for 7 days to obtain a hollow block. The block has a bulk density of 860kg / M 3 , compressive strength 5MP, can be used in non-load-bearing scenarios.

[0060] Example 3

[0061] Weigh 5kg each of coarse and fine slag in a ratio of 1:1; weigh 20kg of stone powder, 4kg of 425# cement, 0.150kg of activator, 2kg of fly ash and 3kg of water.

[0062] The above solid phase components are preliminarily mixed evenly with a mixer, and the liquid phase is added to the preliminarily mixed solid phase by spraying. During the adding process, the solid phase and the liquid phase are further stirred to mix evenly. The mixed materials are formed into a hollow block model (such as Figure 1 ) for forming, and then covered with film and cured for 7 days to obtain a hollow block. The block has a bulk density of 1060kg / M 3 , 28-day unconfined compressive strength is 11.5MP, and can be used in load-bearing scenarios.

[0063] Example 4

[0064] Weigh 15kg each of coarse and fine slag in a ratio of 1:1; weigh 5kg of stone powder, 3kg of 425# cement, 0.050kg of activator, 2kg of fly ash and 3kg of water.

[0065] The above solid phase component materials are preliminarily mixed evenly with a mixer, and the liquid phase is added to the preliminarily mixed solid phase by spraying. During the addition process, the solid phase and the liquid phase are further stirred to mix evenly. The mixed materials are molded using a static pressure or vibration molding machine using a hollow block model, and then covered with a film for 7 days to obtain a hollow block. The block has a bulk density of 680kg / M 3 The 28-day unconfined compressive strength is 2.8MP, which is relatively low and can be used in scenes such as non-load-bearing lightweight partition walls.

[0066] Figure 2This is the XRD test diagram of the hollow block module of Example 1 after curing for 28 days. The figure shows that the main phases of the test block are quartz, calcite and calcium silicate hydrate (CSH), among which quartz and calcite mainly come from stone powder, and calcium silicate hydrate comes from cement hydration. In this figure, no calcium sulfonate formed by cement hydration is found, indicating that the fly ash and activator added in the scheme react with it to form calcium silicate hydrate, which helps to improve the strength of the test block of this scheme.

[0067] Figure 3 The scanning electron microscope photos of Examples 1, 2, 3, and 4 after curing for 28 days are shown respectively. The microstructures of the test blocks in the four examples show that the test blocks are all composed of particles of different sizes and shapes, but it can be seen from the figure that the density of the test blocks composed of various particles in Example 3 is significantly higher than that of the other three examples, which is related to its relatively high compressive strength. Finally, it should be noted that the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0068] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0069] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A fire-free building block prepared with slag and stone powder as raw materials, characterized in that: The raw materials for manufacturing the fire-free building blocks include the following materials by mass fraction: Cement: 5%-15%; fly ash: 1-10%; Activator: 0.05%-3%, the balance is stone powder and basic water slag complex; Wherein, the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5; The basic water-slag mixture is a mixture of coarse water-slag particles and fine water-slag particles in a mass ratio of 1:4 to 4:

1.

2. The unfired building block prepared with slag and stone powder as raw materials according to claim 1, characterized in that: The coarse water slag particles are water slag particles with a particle size of less than 100 mesh, and the fine water slag particles are water slag particles with a particle size of ≥ 100 mesh; The stone powder has a particle size of 0.5-5 mm, and the stone powder includes at least one of quartz particles, feldspar particles and limestone particles.

3. A method for preparing a non-fired building block using slag and stone powder as raw materials as claimed in claim 1 or 2, characterized in that: The method comprises: The water slag is crushed and screened into water slag particles of coarse and fine particle sizes; The coarse water slag particles and the fine water slag particles are mixed in a mass ratio of 1:4 to 4:1 to obtain a basic water slag compound; Add stone powder to the basic water-slag mixture and mix well, wherein the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain a main base material for building blocks; Adding cement, fly ash and an activator to the main base material of the building block and mixing them evenly to obtain a building block solid phase material; Water is added to the solid phase material of the building block, and the unfired building block is obtained after forming.

4. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 3, characterized in that: The method of crushing the slag and screening it into coarse and fine slag particles specifically includes: The water slag with a moisture content lower than 15% is crushed and passed through a 100-mesh sieve to obtain water slag particles of coarse and fine particle sizes, wherein the particles on the 100-mesh sieve are coarse water slag particles, and the particles below the 100-mesh sieve are fine water slag particles.

5. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 3, characterized in that: The stone powder is added to the basic water-slag mixture and mixed evenly, wherein the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain the main base material of the building block, specifically comprising: Add stone powder with a particle size of 0.5-5 mm to the basic water-slag mixture and mix well, wherein the mass ratio of the stone powder to the basic water-slag mixture is 5:1-1:5, to obtain a main base material for building blocks; Wherein, the stone powder is rock particles.

6. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 5, characterized in that: The rock particles include at least one of quartz particles, feldspar particles and limestone particles.

7. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 3, characterized in that: The cement is silicate cement or aluminate cement.

8. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 3, characterized in that: The activator is a mixture of alkaline substances and water-soluble rubber powder.

9. The method for preparing a fire-free building block using slag and stone powder as raw materials according to claim 3, characterized in that: The step of adding water to the solid phase material of the building block to obtain the fire-free building block after forming includes: Water is added to the solid phase material of the building block, and the building block is formed by a static pressure or vibration forming machine to obtain a fire-free building block.

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