Alumina ash-based concrete and method for its production

Abstract

The application discloses a kind of aluminum ash-based concrete and preparation method thereof, it is related to concrete technical field;The aluminum ash-based concrete of the application, raw material components include by weight fraction:182 mass parts cement, 100 mass parts mineral powder, 16~20 mass parts pretreated aluminum ash, 60 mass parts fly ash, 1050 mass parts coarse aggregate, 790 mass parts fine aggregate, 7~7.5 mass parts composite water reducing agent, 172.8 mass parts water;The raw material components of the composite water reducing agent include dimethyl phthalate-5-sodium sulfonate, zinc citrate, glycerol carbonate, alcohol chain extender, n-butyl titanate;The alcohol chain extender includes any one or more combinations of triethanolamine, 1,4-butanediol, neopentyl glycol, hexanediol, heptanediol.

Description

Technical Field

[0001] This invention relates to the field of concrete technology, specifically to an aluminum-ash-based concrete and its preparation method. Background Technology

[0002] Secondary aluminum ash is the ash residue generated during the remelting of primary aluminum ash or the recovery of elemental aluminum from scrap aluminum in the secondary aluminum industry. It contains 5-20% elemental aluminum, as well as aluminum oxide, aluminum nitride, salts (fluorides and chlorides, etc.), and silicon dioxide. The hazards of secondary aluminum ash stem from its leaching and its reaction with water or humid air to produce toxic, harmful, flammable, and foul-smelling gases or substances such as ammonia and fluorine. Furthermore, secondary aluminum ash contains various heavy metals, seriously endangering environmental hygiene and safety. Therefore, the reuse of secondary aluminum ash is urgently needed.

[0003] Concrete, as one of the main ways and carriers of large-scale solid waste consumption, has the advantages of large volume and strong containment. Meanwhile, the main component of secondary aluminum ash is alumina, which is a high-alumina material. Therefore, technicians applied secondary aluminum ash to the field of concrete. However, because secondary aluminum ash reacts easily with water during the concrete mixing process, it generates ammonia or leaches out in the form of fluoride ions, polluting the environment and affecting the lifespan of concrete materials.

[0004] Therefore, the applicant prepared an aluminum-ash-based concrete to solve the above problems. Summary of the Invention

[0005] To address the existing technical problems, this invention provides an aluminum ash-based concrete, the raw material components of which, by weight, include: 182 parts by weight of cement, 100 parts by weight of mineral powder, 16-20 parts by weight of pretreated aluminum ash, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate, 790 parts by weight of fine aggregate, 7-7.5 parts by weight of composite water-reducing agent, and 172.8 parts by weight of water.

[0006] Furthermore, the raw material components of the composite water-reducing agent include sodium dimethyl isophthalate-5-sulfonate, zinc citrate, glyceryl carbonate, alcohol chain extender, and n-butyl titanate.

[0007] Furthermore, the alcohol chain extender includes any one or more combinations of triethanolamine, 1,4-butanediol, neopentyl glycol, hexanediol, and heptahydrate.

[0008] This invention also provides a method for preparing aluminum ash-based concrete, characterized by comprising the following preparation steps:

[0009] (1) Under argon protection, 7-7.5 parts by weight of composite water-reducing agent and 72.8 parts by weight of deionized water are mixed, followed by 16-20 parts by weight of pretreated aluminum ash. The mixture is stirred and mixed, then 3 mol / L sodium hydroxide solution is added to adjust the pH to 8.5, and 0.03 times the mass of composite water-reducing agent of 1,5,7-triazabicyclo[4.4.0]dec-5-ene is added. The mixture is stirred and mixed evenly, while the pressure is increased to 1.5-2.5 atm and the temperature is raised to 110-150℃ and kept at the temperature for 6-10 h to obtain the premix.

[0010] (2) Mix 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate and 790 parts by weight of fine aggregate evenly, and then add the premixed material obtained in step (1) and 100 parts by weight of water in sequence, mix and stir evenly to obtain aluminum ash-based concrete.

[0011] Furthermore, the preparation steps of the composite water-reducing agent are as follows: An alcohol chain extender and sodium dimethyl isophthalate-5-sulfonate are mixed at a molar ratio of 4~4.5:1, heated to 180℃ under nitrogen protection, and then tetrabutyl titanate is added. At this point, the amount of tetrabutyl titanate added accounts for 50 ppm of the total reaction mass. After maintaining the temperature for 1 hour, the temperature is lowered to 140℃, and 0.8~1.2 times the amount of sodium dimethyl isophthalate-5-sulfonate is added. Zinc citrate and sodium dimethyl isophthalate-5-sulfonate, in amounts of 2-3 times the amount of an alcohol chain extender, are reacted at a constant temperature for 4 hours. Then, glycerol carbonate, in amounts of 1-2 times the amount of sodium dimethyl isophthalate-5-sulfonate, is added, and the temperature is raised to 180°C and the reaction is maintained for 3 hours. Subsequently, 200 ppm of tetrabutyl titanate is added, and the temperature is raised to 220°C for a polycondensation reaction for 2 hours to obtain a composite water-reducing agent with a hyperbranched structure.

[0012] Furthermore, the alcohol chain extender is obtained by mixing triethanolamine, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol in a mass ratio of 1:0.08~0.1:0.08~0.1:0.1~0.3:0.1~0.3.

[0013] Furthermore, the preparation method of the pretreated aluminum ash is as follows: the secondary aluminum ash is initially screened using a 60-mesh standard sieve to remove large impurities, and the undersize portion is mixed and homogenized to obtain the pretreated aluminum ash.

[0014] Furthermore, the fine aggregate is washed sea sand, zone II medium sand, with a fineness modulus of 2.68; the coarse aggregate is crushed granite with a particle size of 5-20 mm and an apparent density of 2.72 g / cm³. 3 Bulk density 1.56 g / cm³ 3 .

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The aluminum ash-based concrete of the present invention comprises, by weight, the following raw material components: 182 parts by weight of cement, 100 parts by weight of mineral powder, 16-20 parts by weight of pretreated aluminum ash, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate, 790 parts by weight of fine aggregate, 7-7.5 parts by weight of composite water-reducing agent, and 172.8 parts by weight of water; the raw material components of the composite water-reducing agent include sodium dimethyl isophthalate-5-sulfonate, zinc citrate, glyceryl carbonate, alcohol chain extender, and n-butyl titanate.

[0017] First, sodium dimethyl isophthalate-5-sulfonate, zinc citrate, glyceryl carbonate, alcohol chain extender, and n-butyl titanate are reacted via transesterification and esterification to prepare a hyperbranched composite water-reducing agent. Then, pretreated aluminum ash is added to a mixture of the composite water-reducing agent and water, and an alkali is added for reaction. The pretreated aluminum ash, through the voids in the composite water-reducing agent, mixes uniformly with it. Subsequently, the alumina, aluminum, and aluminum nitride in the aluminum ash hydrolyze under alkaline conditions to form sodium aluminate and ammonia. Under pressure, the ammonia dissolves in water to form ammonia water, which is then adsorbed by sulfonate ions. Within the cavities of the hyperbranched composite water-reducing agent, the cyclic carbonates in the hyperbranched composite water-reducing agent react with ammonia water, firmly attaching ammonia to the composite water-reducing agent. This avoids the ammonia gas generated after the hydrolysis of aluminum ash, which would otherwise pollute the environment. At the same time, the zinc ions from the hydrolyzed aluminum ash combine with the zinc ions attached to the surface of the cavities of the composite water-reducing agent. After hydrothermal treatment, a layer of zinc-aluminum hydrotalcite adheres to the surface of the cavities of the composite water-reducing agent, which can effectively adsorb the free fluoride ions generated after the hydrolysis of aluminum ash, reducing the leaching rate of fluoride ions. When subsequently added to concrete, this can effectively improve the concrete's resistance to salt freezing.

[0018] After cement, mineral powder, fly ash, coarse aggregate, and fine aggregate are mixed evenly, a premix containing a composite water-reducing agent is added and mixed. The composite water-reducing agent disperses rapidly in the concrete through polar groups such as hydroxyl and sulfonic acid groups attached to its surface. Some of the cement, fly ash, and mineral powder enter the composite water-reducing agent through the voids, forming an interpenetrating network structure with the composite water-reducing agent, which enhances the mechanical properties of the concrete. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments, but the following embodiments should not be construed as limiting the present invention.

[0020] The following are some of the raw materials used in this embodiment and the comparative example:

[0021] The cement used is P·O42.5 silicate cement;

[0022] The mineral powder used is S95 grade mineral powder produced in Tangshan, Hebei Province, with a 28-day activity index of 101.5%, which meets the requirements of GB / T18046-2017 "Granulated blast furnace slag powder for use in cement, mortar and concrete".

[0023] The fly ash used is Grade II fly ash from a power plant in Dongguan, which complies with the requirements of GB / T1596-2017 "Fly Ash for Cement and Concrete".

[0024] The fine aggregate is washed sea sand, zone II medium sand, with a fineness modulus of 2.68, which conforms to the requirements of GB / T14684-2022 "Sand for Construction".

[0025] The coarse aggregate is crushed granite from Guangxi, with a particle size of 5-20mm and an apparent density of 2.72g / cm³. 3 The bulk density is 1.56 g / cm3, which meets the requirements of GB / T14685-2022 "Construction Pebbles and Crushed Stones".

[0026] The water used is tap water that meets the requirements of JGJ63—2006 "Standard for Water Used in Concrete Mixing";

[0027] The chemical composition of secondary aluminum ash includes: calcium oxide 3.75%, silicon dioxide 3.49%, ferric oxide 3.72%, aluminum oxide 75.06%, magnesium oxide 1.60%, sulfur trioxide 1.83%, Na₂O + 0.658K₂O 0.72%, loss on ignition 3.5%, and specific surface area 450cm². 2 *g -1 Apparent density (g*cm³) -3 . Example 1

[0028] A method for preparing aluminum ash-based concrete, comprising the following steps:

[0029] (1) Under argon protection, 7 parts by mass of composite water-reducing agent and 72.8 parts by mass of deionized water were mixed, followed by 16 parts by mass of pretreated aluminum ash. The mixture was stirred and mixed, then 3 mol / L sodium hydroxide solution was added to adjust the pH to 8.5, and 0.03 times the mass of composite water-reducing agent of 1,5,7-triazabicyclo[4.4.0]dec-5-ene was added. The mixture was stirred and mixed evenly, and the pressure was increased to 1.5 atm. The temperature was raised to 110℃ and kept at the temperature for 6 hours to obtain the premix.

[0030] (2) Mix 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate and 790 parts by weight of fine aggregate evenly, and then add the premixed material obtained in step (1) and 100 parts by weight of water in sequence, mix and stir evenly to obtain aluminum ash-based concrete.

[0031] The preparation steps of the composite water-reducing agent are as follows: Alcohol chain extender and sodium dimethyl isophthalate-5-sulfonate are mixed at a molar ratio of 4:1. Under nitrogen protection, the mixture is heated to 180℃. Tetrabutyl titanate is added, with the amount of tetrabutyl titanate accounting for 50 ppm of the total reaction mass. After reacting at this temperature for 1 hour, the temperature is lowered to 140℃. Zinc citrate (0.8 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) and alcohol chain extender (2 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) are added. After reacting at this temperature for 4 hours, glyceryl carbonate (1 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) is added. The temperature is further raised to 180℃ and reacted for 3 hours. Subsequently, 200 ppm of tetrabutyl titanate is added, and the temperature is further raised to 220℃ for a polycondensation reaction for 2 hours to obtain a composite water-reducing agent with a hyperbranched structure.

[0032] The alcohol chain extender is obtained by mixing triethanolamine, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol in a mass ratio of 1:0.08:0.08:0.1:0.1.

[0033] Furthermore, the preparation method of pretreated aluminum ash is as follows: the secondary aluminum ash is initially screened using a 60-mesh standard sieve to remove large impurities, and the undersize portion is mixed and homogenized to obtain pretreated aluminum ash. Example 2

[0034] A method for preparing aluminum ash-based concrete, comprising the following steps:

[0035] (1) Under argon protection, 7.3 parts by weight of composite water-reducing agent and 72.8 parts by weight of deionized water were mixed, followed by 18 parts by weight of pretreated aluminum ash. The mixture was stirred and mixed, then 3 mol / L sodium hydroxide solution was added to adjust the pH to 8.5, and 0.03 times the mass of composite water-reducing agent of 1,5,7-triazabicyclo[4.4.0]dec-5-ene was added. The mixture was stirred and mixed evenly, and the pressure was increased to 2 atm and the temperature was raised to 130℃ and kept for 8 hours to obtain the premix.

[0036] (2) Mix 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate and 790 parts by weight of fine aggregate evenly, and then add the premixed material obtained in step (1) and 100 parts by weight of water in sequence, mix and stir evenly to obtain aluminum ash-based concrete.

[0037] The preparation steps of the composite water-reducing agent are as follows: Alcohol chain extender and sodium dimethyl isophthalate-5-sulfonate are mixed at a molar ratio of 4.2:1. Under nitrogen protection, the mixture is heated to 180℃. Tetrabutyl titanate is added, with the amount of tetrabutyl titanate accounting for 50 ppm of the total reaction mass. After reacting at this temperature for 1 hour, the temperature is lowered to 140℃. Zinc citrate (1 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) and alcohol chain extender (2.5 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) are added. After reacting at this temperature for 4 hours, glyceryl carbonate (1.5 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) is added. The temperature is further raised to 180℃ and reacted for 3 hours. Subsequently, 200 ppm of tetrabutyl titanate is added, and the temperature is further raised to 220℃ for a polycondensation reaction for 2 hours to obtain a composite water-reducing agent with a hyperbranched structure.

[0038] The alcohol chain extender is obtained by mixing triethanolamine, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol in a mass ratio of 1:0.09:0.09:0.2:0.2.

[0039] Furthermore, the preparation method of pretreated aluminum ash is as follows: the secondary aluminum ash is initially screened using a 60-mesh standard sieve to remove large impurities, and the undersize portion is mixed and homogenized to obtain pretreated aluminum ash. Example 3

[0040] A method for preparing aluminum ash-based concrete, comprising the following steps:

[0041] (1) Under argon protection, 7.5 parts by mass of composite water-reducing agent and 72.8 parts by mass of deionized water were mixed, followed by the addition of 20 parts by mass of pretreated aluminum ash. The mixture was stirred and mixed, and then 3 mol / L sodium hydroxide solution was added to adjust the pH to 8.5. 0.03 times the mass of composite water-reducing agent was added to 1,5,7-triazabicyclo[4.4.0]dec-5-ene. The mixture was stirred and mixed evenly. At the same time, the pressure was increased to 2.5 atm and the temperature was raised to 150℃ and kept at the temperature for 10 h to obtain the premix.

[0042] (2) Mix 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate and 790 parts by weight of fine aggregate evenly, and then add the premixed material obtained in step (1) and 100 parts by weight of water in sequence, mix and stir evenly to obtain aluminum ash-based concrete.

[0043] The preparation steps of the composite water-reducing agent are as follows: Alcohol chain extender and sodium dimethyl isophthalate-5-sulfonate are mixed at a molar ratio of 4.5:1. Under nitrogen protection, the mixture is heated to 180℃. Then, tetrabutyl titanate is added, with the amount of tetrabutyl titanate accounting for 50 ppm of the total reaction mass. After reacting at this temperature for 1 hour, the temperature is lowered to 140℃. Zinc citrate (1.2 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) and alcohol chain extender (3 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) are added. After reacting at this temperature for 4 hours, glyceryl carbonate (2 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) is added. The temperature is further raised to 180℃ and reacted for 3 hours. Subsequently, 200 ppm of tetrabutyl titanate is added, and the temperature is further raised to 220℃ for a polycondensation reaction for 2 hours, yielding a composite water-reducing agent with a hyperbranched structure.

[0044] The alcohol chain extender is obtained by mixing triethanolamine, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol in a mass ratio of 1:0.1:0.1:0.3:0.3.

[0045] Furthermore, the preparation method of pretreated aluminum ash is as follows: the secondary aluminum ash is initially screened using a 60-mesh standard sieve to remove large impurities, and the undersize portion is mixed and homogenized to obtain pretreated aluminum ash. Comparative Example 1

[0046] The only difference between Comparative Example 1 and Example 2 is that the water-reducing agent used is a solid polycarboxylate high-performance water-reducing agent produced by Shanghai Qi Chemical Technology Co., Ltd., with a water reduction rate of 28.9%. The other steps and components are the same as in Example 2. Comparative Example 2

[0047] The only difference between Comparative Example 2 and Example 2 is that the raw material components of the composite water-reducing agent include only sodium dimethyl isophthalate-5-sulfonate, glyceryl carbonate, alcohol chain extender, and n-butyl titanate; the remaining steps and components are the same as in Example 2. Comparative Example 3

[0048] The only difference between Comparative Example 3 and Example 2 is that the raw material components of the composite water-reducing agent include only sodium dimethyl isophthalate-5-sulfonate, zinc citrate, alcohol chain extender, and n-butyl titanate. The remaining steps and components are the same as in Example 2. Comparative Example 4

[0049] The only difference between Comparative Example 4 and Example 2 is that the alcohol chain extender is obtained by mixing only 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol; the remaining steps and components are the same as in Example 2.

[0050] Comparative Examples 5, 6, 7, and 8

[0051] The only difference between Comparative Examples 5, 6, 7, and 8 and Example 2 is that the reaction temperature in step (1) is 100, 105, 155, and 160, respectively, to obtain a premix; the remaining steps and components are the same as in Example 2.

[0052] Example of effect

[0053] Fluoride ion leaching rate: The leachate was prepared according to the "Leaching Toxicity Method for Solid Waste - Horizontal Oscillation Method" (HJ557-2010): Aluminum-based concrete samples of equal mass obtained from Examples 1-3 and Comparative Examples 1-8 were crushed and passed through a 3mm sieve. The samples were then placed in an oven and dried at 105℃ to constant weight. 100g of the dried sample was placed in a 2L polyethylene bottle, and 1L of deionized water (powder:water = 1:10) was added. The bottle was sealed tightly and fixed to an oscillator. The oscillation frequency was set to (110±10) times / min. After oscillation for 8 hours, the polyethylene bottle was removed and allowed to stand for 16 hours. The leachate was then passed through a 0.45μm filter membrane, and the filtrate was collected. The fluoride ion concentration in the leachate was determined according to GB / T34500.1-2017, and the fluoride ion leaching rate (the ratio of fluoride ions in the leachate to the fluoride element in the material) was calculated.

[0054] Mechanical properties: Aluminum-based concrete prepared in Examples 1-3 and Comparative Examples 1-8 of the same mass was tested for 7-day and 28-day compressive strength in accordance with GB / T50081-2019.

[0055] Salt-freezing resistance: Aluminum-based concrete prepared in Examples 1-3 and Comparative Examples 1-8 of the same mass was tested for salt-freezing spalling quality in accordance with GB / T50082-2009.

[0056] Table 1 below shows the test and analysis results of various properties of the aluminum ash-based concrete prepared by Examples 1-3 and Comparative Examples 1-8 of the present invention.

[0057] Table 1

[0058]

[0059] Table 1 shows that the aluminum-based concrete prepared in the examples had a low fluoride leaching rate, good salt-freezing resistance, and good mechanical properties, and no ammonia was produced. Comparing Example 2 with Comparative Example 1, Example 2 showed that the aluminum-based concrete prepared using the composite water-reducing agent had a low fluoride leaching rate, good salt-freezing resistance, and good mechanical properties, and no ammonia was produced. Comparing Example 2 with Comparative Examples 2-3, Example 2 showed that the composite water-reducing agent prepared using sodium dimethyl isophthalate-5-sulfonate, zinc citrate, glyceryl carbonate, alcohol chain extender, and n-butyl titanate resulted in aluminum-based concrete with a low leaching rate, good salt-freezing resistance, and no ammonia production. Comparing Example 2 with Comparative Example 4, Example 2 showed that the use of triethanolamine, 1,4-butanediol, neopentyl glycol, and 1,6-hexanediol... Alcohol chain extenders prepared by mixing 1,7-heptadecyl glycol and aluminum ash-based concrete showed low leaching rate, good salt-freezing resistance, and good mechanical properties, and no ammonia was produced. This may be due to the reaction and grafting of triethanolamine with sodium dimethyl isophthalate-5-sulfonate, zinc citrate, etc., forming a hyperbranched composite water-reducing agent with good adsorption properties, increasing the specific surface area, and making the interaction between sulfonates, hydroxyl groups, carboxyl groups, zinc ions and secondary aluminum ash, cement and other components more thorough, forming an interpenetrating network structure in the concrete. Compared with comparative examples 5-8, Example 2 showed that aluminum ash-based concrete prepared at a premix reaction temperature of 110-150℃ had better salt-freezing resistance and mechanical properties, possibly due to the formation of hydrotalcite, which has good adsorption and chlorine fixation capabilities.

[0060] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. An aluminum-ash-based concrete, characterized in that, The raw material components by weight are: 182 parts cement, 100 parts mineral powder, 16-20 parts pretreated aluminum ash, 60 parts fly ash, 1050 parts coarse aggregate, 790 parts fine aggregate, 7-7.5 parts composite water-reducing agent, and 172.8 parts water. The preparation steps of the composite water-reducing agent are as follows: Alcohol chain extender and sodium dimethyl isophthalate-5-sulfonate are mixed at a molar ratio of 4~4.5:

1. Under nitrogen protection, the mixture is heated to 180℃. Tetrabutyl titanate is added, with the amount of tetrabutyl titanate accounting for 50 ppm of the total reaction mass. After reacting at this temperature for 1 hour, the temperature is lowered to 140℃. Zinc citrate (0.8~1.2 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) and alcohol chain extender (2~3 times the molar amount of sodium dimethyl isophthalate-5-sulfonate) are added. After reacting at this temperature for 4 hours, the mixture is then added... The amount of sodium dimethyl isophthalate-5-sulfonate is 1-2 times that of glyceryl carbonate, and the temperature is further raised to 180°C and maintained for 3 hours. Then, 200 ppm of tetrabutyl titanate is added, and the temperature is further raised to 220°C for polycondensation reaction for 2 hours to obtain a composite water-reducing agent with a hyperbranched structure. The alcohol chain extender is obtained by mixing triethanolamine, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol in a mass ratio of 1:0.08-0.1:0.08-0.1:0.1-0.3:0.1-0.

3. The pretreated aluminum ash preparation method uses a 60-mesh standard sieve to perform initial screening of secondary aluminum ash to remove large impurities, and the undersize portion is mixed and homogenized to obtain pretreated aluminum ash. The aluminum ash-based concrete includes the following steps: Under argon protection, 7-7.5 parts by weight of composite water-reducing agent and 72.8 parts by weight of water are mixed, followed by 16-20 parts by weight of pretreated aluminum ash. The mixture is stirred and mixed, followed by 3 mol / L sodium hydroxide solution to adjust the pH to 8.5, and 0.03 times the mass of composite water-reducing agent of 1,5,7-triazabicyclo[4.4.0]dec-5-ene is added. At the same time, the pressure is increased to 1.5-2.5 atm, and the temperature is raised to 110-150℃ and kept at the temperature for 6-10 hours to obtain a premix; 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate, and 790 parts by weight of fine aggregate are mixed and stirred evenly, followed by the premix obtained in step (1) and 100 parts by weight of water, and the mixture is stirred evenly to obtain aluminum ash-based concrete.

2. A method for preparing aluminum-ash-based concrete as described in claim 1, characterized in that, The preparation steps include the following: (1) Under argon protection, 7-7.5 parts by weight of composite water-reducing agent and 72.8 parts by weight of water are mixed, followed by 16-20 parts by weight of pretreated aluminum ash. The mixture is stirred and mixed, then 3 mol / L sodium hydroxide solution is added to adjust the pH to 8.5, and 0.03 times the mass of composite water-reducing agent of 1,5,7-triazabicyclo[4.4.0]dec-5-ene is added. At the same time, the pressure is increased to 1.5-2.5 atm, and the temperature is raised to 110-150℃ and kept at the temperature for 6-10 h to obtain the premix. (2) Mix 182 parts by weight of cement, 100 parts by weight of mineral powder, 60 parts by weight of fly ash, 1050 parts by weight of coarse aggregate and 790 parts by weight of fine aggregate evenly, and then add the premixed material obtained in step (1) and 100 parts by weight of water in sequence, mix and stir evenly to obtain aluminum ash-based concrete.

3. The method for preparing aluminum-ash-based concrete according to claim 2, characterized in that, The fine aggregate is washed sea sand, Zone II medium sand, with a fineness modulus of 2.68; the coarse aggregate is crushed granite with a particle size of 5-20 mm and an apparent density of 2.72 g / cm³. 3 Bulk density 1.56 g / cm³ 3 .

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