Alkali-activated concrete based on stone powder-containing machine-made sand and preparation method of alkali-activated concrete

Abstract

The invention provides alkali-activated concrete based on stone powder-containing machine-made sand and a preparation method of the alkali-activated concrete. The alkali-activated concrete based on the stone powder-containing machine-made sand is prepared from the following components in parts by weight: 200 to 280 parts of slag, 19 to 161 parts of fly ash, 18 to 160 parts of dechlorinated and detoxified waste incineration fly ash, 218 to 221 parts of alkali activator, 705 to 839 parts of stone powder-containing machine-made sand, 1045 to 1117 parts of gravel and 2 to 4 parts of water reducing agent. According to the method, the alkali-activated multi-source solid waste system is constructed, the cementitious curing reaction of the cementing material is achieved, the stone powder contained in the machine-made sand serves as a cementing component to participate in structure formation, and therefore efficient resource utilization of the machine-made sand containing the stone powder is achieved. The obtained concrete has the characteristics of high strength, low carbon, environment friendliness, controllable cost, high solid waste utilization rate and the like, and has a good engineering application prospect.

Description

Technical Field

[0001] This invention belongs to the field of concrete technology, specifically relating to an alkali-activated concrete based on manufactured sand containing stone powder and its preparation method. Background Technology

[0002] Manufactured sand, as an important substitute for natural sand, has been widely used in the construction industry in recent years. It not only alleviates the growing shortage of high-quality river sand resources to some extent but also effectively reduces environmental damage. Manufactured sand is typically produced by crushing, screening, and shaping parent rock, resulting in fine aggregates with a particle size of less than 4.75 mm. During its production, a large amount of stone powder is inevitably generated. This stone powder usually refers to particles with a particle size of less than 75 µm. Especially in dry sand production processes, the stone powder content in manufactured sand is often high, sometimes exceeding 10%. If stone powder is included in the total fine aggregate content, it will lead to an overestimation of the nominal sand ratio and an underestimation of the actual sand ratio, thus causing an imbalance in the concrete gradation.

[0003] According to the relevant provisions of the "Standard for Quality and Testing Methods of Sand and Stone for Ordinary Concrete" (JGJ 52-2006), the permissible stone powder content in manufactured sand decreases with the increase of concrete strength grade: for concrete with strength grade C25 and below, the stone powder content shall not exceed 10%; for concrete with strength grade C30~C55, the stone powder content shall not exceed 7%; and for concrete with strength grade C60 and above, the stone powder content shall not exceed 5%. In practical engineering applications, to meet the above standard requirements, manufactured sand usually needs to be washed to reduce the stone powder content. However, this method not only requires the additional consumption of a large amount of water and energy, increasing production and processing costs, but also converts stone powder that could have been utilized as a resource into discharged sludge, causing a certain degree of resource waste and environmental burden.

[0004] Meanwhile, cement, as one of the most widely used man-made materials globally, is characterized by high energy consumption and significant carbon emissions during its production process. According to relevant research, cement production contributes approximately 7% to 9% of global anthropogenic carbon emissions. Against this backdrop, reducing the carbon footprint of cement systems has become an important development direction in the concrete materials field. In contrast, alkali-activated materials, using amorphous aluminosilicate materials as the main raw material, form hydraulic gels through alkali activation reactions, demonstrating certain advantages in reducing carbon emissions. Furthermore, using solid wastes such as slag, fly ash, or incinerator fly ash as raw materials can alleviate the environmental pressure caused by solid waste accumulation to some extent.

[0005] Therefore, given the urgent need for efficient resource utilization of manufactured sand containing stone powder and the urgent need for low-carbon alternatives to cement systems, how to construct a concrete material system that balances resource utilization and environmental benefits remains a technical problem that needs further research and solutions in this field. Summary of the Invention

[0006] The purpose of this invention is to address the problems of low utilization rate of manufactured sand containing stone powder and high carbon emissions of traditional cement concrete by providing an alkali-activated concrete based on manufactured sand containing stone powder and its preparation method, thereby achieving the synergistic resource utilization of manufactured sand containing stone powder and various solid wastes, and reducing the dependence of concrete systems on cement.

[0007] The technical solution adopted in this invention is as follows: An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 200-280 parts slag, 19-161 parts fly ash, 18-160 parts dechlorinated and detoxified waste incineration fly ash, 218-221 parts alkali activator, 705-839 parts manufactured sand containing stone powder, 1045-1117 parts crushed stone, and 2-4 parts water-reducing agent.

[0008] Furthermore, the alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 21 parts fly ash, 20 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 799 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0009] Furthermore, the slag, fly ash, and dechlorinated and detoxified waste incineration fly ash respectively meet the following particle size requirements: the passing rate through a 100-mesh sieve reaches 100%, and the passing rate through a 200-mesh sieve is not less than 85%.

[0010] Furthermore, the slag is S95 grade granulated blast furnace slag powder.

[0011] Furthermore, the fly ash is Grade I or Grade II, and the total content of SiO2 and Al2O3 in the fly ash is not less than 80 wt%.

[0012] Furthermore, the dechlorinated and detoxified waste incineration fly ash is obtained by washing and low-temperature heat treatment of waste incineration fly ash.

[0013] Furthermore, the alkaline activator is a sodium silicate solution with a modulus of 1.4 to 1.6.

[0014] Furthermore, the alkaline activator is a sodium silicate solution with a modulus of 1.5.

[0015] Furthermore, the alkaline activator is prepared by using industrial water glass with a modulus of 2.3 to 3.4 as raw material, adding sodium hydroxide and water, and adjusting its modulus.

[0016] Modulus refers to the molar ratio of silicon dioxide (SiO2) to sodium oxide (Na2O) in a sodium silicate solution. Adding sodium hydroxide (NaOH) increases the Na2O content in the solution, thereby reducing the modulus; adding water has a dilution effect.

[0017] Industrial water glass with a modulus of 2.3 to 3.4 is relatively easy to obtain. In the actual preparation process, sodium silicate solutions with other moduli can also be used as starting materials for preparation. The preparation process is a conventional technique known to those skilled in the art.

[0018] Furthermore, the total water content in the alkali activator is 45 wt% of the total amount of stone powder in the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, and manufactured sand. This ensures fluidity while avoiding excessive water content that could affect the hardened strength.

[0019] Furthermore, the stone powder-containing manufactured sand is medium sand obtained from limestone, and the stone powder content in the stone powder-containing manufactured sand is 3~11wt%.

[0020] Furthermore, the crushed stone is made by mixing limestone crushed stone with a particle size of 5-10 mm and 10-20 mm in a mass ratio of 2:3.

[0021] Furthermore, the water-reducing agent is a polycarboxylate powder water-reducing agent. It has advantages such as high water reduction rate, low slump loss, and high dispersibility, and can make the slurry have high fluidity even at low content.

[0022] A method for preparing alkali-activated concrete based on manufactured sand containing stone powder includes the following steps: S1. Weigh out the slag, fly ash and dechlorinated and detoxified waste incineration fly ash according to the weight parts, mix them evenly, and obtain dry powder; S2. Mix the dry powder obtained in step S1 with stone powder-containing manufactured sand, crushed stone and water-reducing agent evenly to obtain dry mixture; S3. Add alkali activator to the dry mix obtained in step S2, stir evenly, and obtain alkali activated concrete.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention constructs an alkali-activated multi-source solid waste system to achieve cement-free solidification reaction of cementitious materials, fundamentally reducing dependence on cement and significantly reducing resource and energy consumption and carbon emissions during cement production and use, thus having outstanding low-carbon and environmental protection advantages.

[0024] (2) This invention introduces a variety of solid wastes, such as slag, fly ash and dechlorinated and detoxified waste incineration fly ash, into the alkali activation system in a coordinated manner. By rationally designing the ratio of each raw material, a “high calcium-low calcium” synergistic activation mechanism is constructed to effectively match the reactivity of different components, avoid the problem of reaction rate imbalance and mechanical property fluctuation caused by direct compounding of multiple solid wastes, and realize the efficient resource utilization of multiple solid wastes.

[0025] (3) The present invention makes full use of the stone powder contained in the manufactured sand and uses it as a component of the cementitious system to participate in the structural formation. This not only avoids the waste of resources, environmental burden and additional processing costs caused by the traditional powder washing process, but also allows the stone powder to play a micro-aggregate filling effect in the system, optimize the pore structure of the slurry and improve the overall density of the concrete.

[0026] (4) During the alkali-activated reaction, the stone powder in the manufactured sand can also serve as a nucleation site, promoting the generation and growth of alkali-activated products, thereby further enhancing the compactness of the matrix structure and the mechanical properties of concrete.

[0027] (5) Through a large number of experiments and performance response analysis, the present invention systematically optimizes the key parameters such as the modulus and liquid-solid ratio of the alkali activator, effectively avoiding problems such as excessively fast setting or insufficient strength after hardening, and ensuring that the concrete system has stable and excellent mechanical properties.

[0028] (6) While achieving high utilization of solid waste and environmental friendliness, the alkali-activated concrete based on stone powder-containing manufactured sand prepared by this invention has good engineering performance under the premise of controllable cost, and takes into account both environmental and economic benefits. It has broad application prospects in the field of green building materials. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the raw materials, equipment, etc. used in the following embodiments can be obtained through conventional means.

[0030] Example 1 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 21 parts fly ash, 20 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 799 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0031] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 11 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0032] The above-mentioned method for preparing alkali-activated concrete based on manufactured sand containing stone powder includes the following steps: S1. Weigh out the slag, fly ash and dechlorinated waste incineration fly ash according to the weight parts, mix them evenly to obtain dry powder; wherein, the particle size requirements of the slag, fly ash and dechlorinated waste incineration fly ash are: the passing rate of 100 mesh sieve reaches 100%, and the passing rate of 200 mesh sieve is not less than 85%.

[0033] S2. Mix the dry powder obtained in step S1 with stone powder-containing manufactured sand, crushed stone and water-reducing agent evenly to obtain dry mixture; during the preparation process, control the total water content in the alkali activator to be 45wt% of the total amount of slag, fly ash, dechlorinated and detoxified waste incineration fly ash and stone powder in the manufactured sand.

[0034] S3. Add the prepared alkali activator to the dry mix obtained in step S2, stir evenly, and obtain alkali activated concrete.

[0035] S4. Pour the prepared concrete into the mold, cover it with a film and let it stand for 24 hours before demolding. Then place it in a standard curing room with a temperature of 20±2℃ and a relative humidity of over 95% for curing.

[0036] Example 2 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 28 parts fly ash, 27 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 785 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0037] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 9 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0038] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0039] Example 3 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 35 parts fly ash, 35 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 770 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0040] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 7 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0041] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0042] Example 4 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 42 parts fly ash, 42 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 756 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0043] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 5 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0044] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0045] Example 5 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 49 parts fly ash, 49 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 742 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0046] in: Stone powder-containing manufactured sand is medium sand produced from limestone, with a stone powder content of 3 wt%. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0047] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0048] Example 6 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 21 parts fly ash, 20 parts dechlorinated and detoxified waste incineration fly ash, 218 parts alkali activator, 799 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0049] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 11 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.4, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0050] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0051] Example 7 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 21 parts fly ash, 20 parts dechlorinated and detoxified waste incineration fly ash, 221 parts alkali activator, 799 parts manufactured sand containing stone powder, 1080 parts crushed stone, and 4 parts water-reducing agent.

[0052] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 11 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.6, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0053] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0054] Example 8 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 19 parts fly ash, 18 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 839 parts manufactured sand containing stone powder, 1045 parts crushed stone, and 4 parts water-reducing agent.

[0055] in: Stone powder-containing manufactured sand is medium sand produced from limestone, containing 11 wt% stone powder. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0056] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0057] Example 9 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 280 parts slag, 50 parts fly ash, 49 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 705 parts manufactured sand containing stone powder, 1117 parts crushed stone, and 4 parts water-reducing agent.

[0058] in: Stone powder-containing manufactured sand is medium sand produced from limestone, with a stone powder content of 3 wt%. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0059] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0060] Example 10 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 200 parts slag, 90 parts fly ash, 89 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 705 parts manufactured sand containing stone powder, 1117 parts crushed stone, and 4 parts water-reducing agent.

[0061] in: Stone powder-containing manufactured sand is medium sand produced from limestone, with a stone powder content of 3 wt%. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0062] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0063] Example 11 An alkali-activated concrete based on manufactured sand containing stone powder is composed of the following components in parts by weight: 200 parts slag, 90 parts fly ash, 89 parts dechlorinated and detoxified waste incineration fly ash, 219 parts alkali activator, 705 parts manufactured sand containing stone powder, 1117 parts crushed stone, and 2 parts water-reducing agent.

[0064] in: Stone powder-containing manufactured sand is medium sand produced from limestone, with a stone powder content of 3 wt%. The preparation method of the alkali activator is as follows: sodium hydroxide and water are added to industrial water glass with a modulus of 2.39 in proportion, stirred evenly and allowed to stand for 24 hours to adjust the modulus of the solution to 1.5, and sodium silicate solution is prepared for use as alkali activator. The water-reducing agent is Subote PCA ® -300P powdered polycarboxylate superplasticizer.

[0065] The preparation method of alkali-activated concrete based on manufactured sand containing stone powder is the same as in Example 1.

[0066] Comparative Example 1 It is basically the same as Example 10, except that: the slag is 120 parts, the fly ash is 130 parts, and the dechlorination and detoxification waste incineration fly ash is 129 parts.

[0067] Comparative Example 2 The method is basically the same as Example 10, except that: the alkali activator is 239 parts; during the preparation process, the total water content in the alkali activator is controlled to be 50 wt% of the total amount of slag, fly ash, dechlorinated and detoxified waste incineration fly ash and stone powder in the manufactured sand.

[0068] Comparative Example 3 It is basically the same as Example 10, except that the water-reducing agent is a lignin-based water-reducing agent (Hemu brand sodium lignin sulfonate).

[0069] Test case Test samples: Alkali-activated concrete based on stone powder-containing manufactured sand prepared in Examples 1-11 and Comparative Examples 1-3.

[0070] Test method: The compressive strength of the above samples at 7 days and 28 days was determined in accordance with the national standard "Standard for Test Methods of Physical and Mechanical Properties of Concrete" (GB / T 50081-2019).

[0071] Test results: The specific test results are shown in Table 1.

[0072] Table 1. Compressive strength of different test samples at 7 days and 28 days

[0073] As shown in Table 1, the alkali-activated concretes containing stone powder prepared in Examples 1-11 of this invention all exhibited a 28-day compressive strength of no less than 60.0 MPa, reaching a strength grade of C60 or higher. Comparison of Examples 1-5 shows that the compressive strength of the concrete gradually increases with the increase of stone powder content in the manufactured sand. This is mainly attributed to the micro-aggregate filling effect of stone powder, which optimizes the pore structure of the paste. Simultaneously, it acts as a reaction nucleation site, promoting the formation of alkali-activated products, thereby enhancing the density of the matrix. Comparison of Examples 1, 6, and 7 shows that fine-tuning the modulus of the alkali activator within the range of 1.4-1.6 has little impact on the mechanical properties of the concrete. A comparison of the data from Examples 1 and 8, and Examples 5 and 9, shows that a fine-tuning of the sand ratio within a range of approximately 0.5% has no significant effect on the compressive strength. Compared to Example 9, Example 10 reduced the highly reactive slag component, resulting in a significant decrease in compressive strength, but still meeting the C60 strength grade requirement. Compared with Examples 10 and 11, in Example 11, after reducing the amount of polycarboxylate superplasticizer, the compressive strength continued to decrease slightly.

[0074] Compared to Example 10, Comparative Examples 1 and 2 show that further reducing the amount of slag or increasing the liquid-to-solid ratio both lead to a significant decrease in the mechanical properties of concrete. Meanwhile, the results of Comparative Example 3 show that the use of lignin-based water-reducing agents that are easily decomposed in strongly alkaline environments also has a significant adverse effect on the compressive strength of concrete.

[0075] In summary, this invention achieves cement-free solidification of cementitious materials by constructing an alkali-activated multi-source solid waste system, and utilizes stone powder contained in manufactured sand as a cementing component to participate in structural formation, thereby realizing the efficient resource utilization of stone powder-containing manufactured sand. The resulting concrete has the characteristics of high strength, low carbon emissions, environmental friendliness, controllable cost, and high solid waste utilization rate, and has good prospects for engineering applications.

[0076] Finally, it should be noted that the above embodiments are merely illustrative of the principles, performance, and effects of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An alkali-activated concrete based on manufactured sand containing stone powder, characterized in that, It is composed of the following components in parts by weight: 200-280 parts slag, 19-161 parts fly ash, 18-160 parts dechlorinated and detoxified waste incineration fly ash, 218-221 parts alkali activator, 705-839 parts manufactured sand containing stone powder, 1045-1117 parts crushed stone, and 2-4 parts water-reducing agent.

2. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The slag, fly ash, and dechlorinated and detoxified waste incineration fly ash shall meet the following particle size requirements: 100% passing through a 100-mesh sieve and not less than 85% passing through a 200-mesh sieve.

3. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The slag is S95 grade granulated blast furnace slag powder.

4. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The fly ash is of Grade I or Grade II, and the total content of SiO2 and Al2O3 in the fly ash is not less than 80 wt%.

5. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The dechlorinated and detoxified waste incineration fly ash is obtained by washing and low-temperature heat treatment of waste incineration fly ash.

6. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The alkaline activator is a sodium silicate solution with a modulus of 1.4 to 1.

6.

7. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The stone powder-containing manufactured sand is medium sand made from limestone, and the stone powder content in the stone powder-containing manufactured sand is 3~11wt%.

8. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The crushed stone is made by mixing limestone crushed stone with a particle size of 5~10mm and 10~20mm in a mass ratio of 2:

3.

9. The alkali-activated concrete based on manufactured sand containing stone powder according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate powder water-reducing agent.

10. A method for preparing alkali-activated concrete based on manufactured sand containing stone powder as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Weigh out the slag, fly ash and dechlorinated and detoxified waste incineration fly ash according to the weight parts, mix them evenly, and obtain dry powder; S2. Mix the dry powder obtained in step S1 with stone powder-containing manufactured sand, crushed stone and water-reducing agent evenly to obtain dry mixture; S3. Add alkali activator to the dry mix obtained in step S2, stir evenly, and obtain alkali activated concrete.

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