A self-compacting polymer concrete and a preparation method and application thereof

Abstract

This invention relates to the field of concrete technology, specifically to a self-compacting polymer concrete, its preparation method, and its application. The self-compacting polymer concrete, by weight, comprises the following components: 260-300 parts geopolymer, 80-120 parts composite mineral admixture, 900-1000 parts crushed stone, 700-900 parts washed sand, and 140-160 parts modified coal chemical wastewater. By using geopolymer to replace specific amounts of traditional silicate cement and industrial solid waste, the problems of poor fluidity, high shrinkage, low strength, and easy cracking in concrete prepared with traditional silicate cement are solved.

Description

Technical Field

[0001] This invention relates to the field of concrete technology, specifically to a self-compacting polymer concrete, its preparation method, and its application. Background Technology

[0002] Traditional self-compacting concrete suffers from problems such as poor fluidity, easy bleeding, high shrinkage, and insufficient density during construction, leading to increased construction difficulty and reduced structural durability. These problems are particularly prominent in large-volume, high-flow-state construction scenarios. Early plastic shrinkage coupled with temperature stress can easily induce through cracks and leakage channels, resulting in a significant reduction in concrete strength and a substantial decrease in the service life of the structure.

[0003] The cementitious material system is the root cause of the above problems. Current formulations still mainly use silicate cement, and the large amount of cement used directly increases the project cost. More importantly, the concentrated heat release and large shrinkage of cement hydration become an inherent weakness in crack control. To alleviate the side effects of cement, the engineering industry has generally introduced mineral admixtures such as fly ash and mineral powder. However, traditional admixtures have large quality fluctuations, high carbon content, unreasonable particle size distribution, and low activity index, which easily leads to problems such as high water demand of concrete and ineffective adsorption of admixtures. This reduces the workability of concrete, and the mechanical and durability properties deteriorate simultaneously, increasing the risk of cracking instead of decreasing it.

[0004] On the other hand, the emissions of industrial solid wastes such as coal gasification slag, ferrosilicon manganese slag, furnace bottom ash, and desulfurization gypsum are enormous, with an annual output exceeding one billion tons. Traditional simple landfill or stockpiling methods not only occupy large amounts of land but also cause secondary pollution such as heavy metal leaching, dust, and alkaline leachate. Although research has attempted to convert these solid wastes into auxiliary cementitious materials, the relevant processes are difficult to effectively activate their potential activity and mostly remain at the level of "single slag type," failing to conduct synergistic design based on the differences in the chemical and mineral composition of different solid wastes. This results in unstable admixture performance and low activity, making it difficult to meet the requirements of high-performance concrete. Furthermore, the calcination process adopts a "one-size-fits-all" approach with fixed heating rates, constant temperature platforms, and cooling regimes, which cannot deeply remove residual carbon from various solid wastes, nor can it accurately control the glass content and activity index. This affects the water demand ratio and admixture adsorption capacity of the mixture, reduces the fluidity and strength of concrete, and limits the large-scale application of these industrial solid wastes in the concrete field.

[0005] Against this backdrop, there is an urgent need for a geopolymer cement concrete system that combines high fluidity, low shrinkage, self-compacting properties, and low cost. This system should not only eliminate the dependence on high cement usage but also enable the synergistic high-value utilization of various industrial solid wastes, thereby improving environmental pollution. Furthermore, through a programmable calcination process, it should completely solve the historical problems of high residual carbon, low activity, and large performance fluctuations, thus providing low-cracking and durable concrete materials for complex structures, large volumes, and harsh service environments. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention provides a self-compacting geopolymer concrete, its preparation method, and its application. By using geopolymers to replace traditional silicate cement, and by employing specific amounts of different industrial solid wastes and specific calcination processes in the composite mineral admixtures, the problems of poor fluidity, high shrinkage, low strength, and easy cracking in concrete prepared with traditional silicate cement are solved.

[0007] The first aspect of the present invention provides a self-compacting polymer concrete, comprising, by weight, the following components: 260-300 parts geopolymer, 80-120 parts composite mineral admixture, 900-1000 parts crushed stone, 700-900 parts washed sand, and 140-160 parts modified coal chemical wastewater.

[0008] By adopting the above technical solution and replacing traditional silicate cement with geopolymer, the low heat, micro-expansion and high water demand of geopolymer can be utilized to solve the problems of poor fluidity, large shrinkage and easy cracking of concrete prepared by traditional silicate cement.

[0009] According to an embodiment of the present invention, the geopolymer comprises, by weight, 10-20 parts of industrial by-product gypsum, 50-80 parts of slag, 1-10 parts of coal-based solid waste, and 1-20 parts of alkaline activator.

[0010] According to an embodiment of the present invention, the coal-based solid waste includes one or more of fly ash, coal gangue, and coal gasification slag.

[0011] According to an embodiment of the present invention, the alkaline activator includes one or more of carbide slag, steel slag, and cement.

[0012] According to an embodiment of the present invention, the composite mineral admixture comprises, by weight: 50-60 parts of mixture, 30-40 parts of metakaolin, 5-10 parts of silica fume, 0-2 parts of polyvinyl propylene, 0.5-2 parts of sodium pyrophosphate, and 0.5-2 parts of triethanolamine.

[0013] According to an embodiment of the present invention, the mixture comprises, by weight, 5-10 parts of coal gasification slag, 5-10 parts of ferrosilicon manganese slag, 5-10 parts of bottom ash, 10-15 parts of fly ash, and 3-5 parts of desulfurization gypsum.

[0014] According to an embodiment of the present invention, the specific surface area of ​​the composite mineral admixture is 500–700 m². 2 / kg.

[0015] According to an embodiment of the present invention, the fineness modulus of the washed sand is 2.4 to 2.7.

[0016] According to an embodiment of the present invention, the crushed stone satisfies at least one of the following conditions:

[0017] The particle size of the crushed stone is 5-20 mm; The crushing value of the crushed stone is 6-10%.

[0018] According to an embodiment of the present invention, the modified coal chemical wastewater comprises, by weight: 70-80 parts tap water, 2-4 parts calcium nitrate, 20-30 parts high-salt wastewater, 3-5 parts polycarboxylate superplasticizer, 0-0.8 parts isopentenyl polyoxyethylene ether, 0-2 parts hydroxypropyl methylcellulose, and 0-0.5 parts sodium fatty alcohol sulfate.

[0019] According to an embodiment of the present invention, the spread of the self-compacting polymer concrete is greater than 700 mm.

[0020] A second aspect of the present invention provides a method for preparing the above-mentioned self-compacting polymer concrete, comprising: Geopolymer, composite mineral admixture, crushed stone, and washed sand are mixed together, and modified coal chemical wastewater is added in two batches, with stirring after each addition, to obtain geopolymer concrete.

[0021] According to an embodiment of the present invention, the preparation method of the composite mineral admixture includes: The coal gasification slag, ferromanganese slag, furnace bottom ash, fly ash and desulfurization gypsum are mixed and calcined to obtain a mixture. Sodium pyrophosphate was divided into a first part sodium pyrophosphate and a second part sodium pyrophosphate, and triethanolamine was divided into a third part triethanolamine and a fourth part triethanolamine. The mixture, a first part of sodium pyrophosphate, and a third part of triethanolamine are mixed and subjected to a first grinding; metakaolin, a second part of sodium pyrophosphate, and a fourth part of triethanolamine are added and subjected to a second grinding; silica fume and polyvinyl propylene are added and subjected to a third grinding to obtain a composite mineral admixture.

[0022] According to an embodiment of the present invention, the first part of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, the second part of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, and the sum of the percentages of the first part of sodium pyrophosphate and the second part of sodium pyrophosphate in the total amount of sodium pyrophosphate is 100%.

[0023] According to an embodiment of the present invention, the third portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, the fourth portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, and the sum of the percentages of the third portion of triethanolamine and the fourth portion of triethanolamine accounts for 100% of the total amount of triethanolamine.

[0024] According to an embodiment of the present invention, the calcination employs a gradient heating-cooling calcination process, comprising: Heat to 300-400℃ at a heating rate of 5-10℃ / min, and hold for 15-20 minutes; Heat to 500-700℃ at a heating rate of 3-5℃ / min, and hold for 20-30 minutes; Heat to 900-1000℃ at a heating rate of 2-4℃ / min, and hold for 40-60 min; Cool down to room temperature at a rate of 10–15 °C / min and hold for 40–60 min.

[0025] According to the technical solution of the present invention, the above preparation method further includes at least one of the following additional technical features: The grinding time for the first grinding process is 70–90 minutes; The interval after the first grinding is 30 to 60 minutes; The grinding time for the second grinding process is 20–30 minutes; The interval after the second grinding is 30 to 60 minutes; The grinding time for the third grinding process is 20 to 30 minutes.

[0026] According to an embodiment of the present invention, the method for preparing the modified coal chemical wastewater includes: Mix tap water and calcium nitrate together and let stand. Add high-salt wastewater and polycarboxylate superplasticizer for a second mixing and let stand; Add isopentenyl polyoxyethylene ether, hydroxypropyl methylcellulose, and sodium fatty alcohol sulfate and mix to obtain modified coal chemical wastewater.

[0027] According to an embodiment of the present invention, the method for preparing the modified coal chemical wastewater further includes at least one of the following additional technical features: The mixing time for the first mixing and settling is 15-20 minutes; The settling time for the first mixture is 5 to 10 minutes; The mixing time for the second mixing and settling is 15-20 minutes; The settling time for the second mixture is 5 to 10 minutes; The mixing and stirring time is 20 to 40 minutes.

[0028] According to an embodiment of the present invention, a Physical Information Neural Network (PINN) model is used to select the dosage of each component in the composite mineral admixture and the calcination process parameters.

[0029] According to an embodiment of the present invention, the selection of the dosage of each component in the composite mineral admixture and the calcination process parameters using the PINN model includes: Collect characteristic data such as chemical composition, particle size distribution, and residual carbon content of industrial solid waste, and record the current calcination process parameters and the corresponding performance indicators of the mixture; The characteristic data, calcination process parameters, and performance indicators are integrated, cleaned, and normalized. A PINN model is constructed using the respective amounts of the industrial solid wastes and the calcination process parameters as neurons. By adopting the above scheme, the normalization process is conducive to the accurate identification and utilization of these characteristic data by the subsequent model. The dosage of each of the coal gasification slag, ferromanganese slag, bottom ash, fly ash and desulfurization gypsum is used as 5 neurons, and the parameters of each stage of the calcination process are used as a total of 7 neurons. This fully considers the situation of different solid waste combinations and different calcination processes, so that the model can perform performance prediction and optimization according to different solid waste ratios and calcination processes.

[0030] A third aspect of the present invention provides the application of the above-described self-compacting polymer concrete and / or the self-compacting polymer concrete prepared by the above-described preparation method in dams.

[0031] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0035] In this document, the terms “comprising” or “including” are open-ended expressions, meaning that they include the contents specified in this invention, but do not exclude other aspects.

[0036] In this document, the terms “optionally,” “optionally,” or “optionally” generally refer to an event or condition that may, but may not, occur, and the description includes both cases in which the event or condition occurs and cases in which the event or condition does not occur.

[0037] To address the technical problems of poor fluidity, high shrinkage, easy cracking, and low strength in high-fluidity concrete prepared with traditional silicate cement, as well as the low activity and difficulty in co-using industrial solid waste, this invention provides a self-compacting polymer concrete, its preparation method, and its application. By using geopolymers to replace traditional silicate cement, and by specifying the dosage of different industrial solid wastes and a specific calcination process in the composite mineral admixtures, the problems of poor fluidity, high shrinkage, low strength, and easy cracking in concrete prepared with traditional silicate cement are solved.

[0038] The first aspect of the present invention provides a self-compacting polymer concrete, comprising, by weight, the following components: 260-300 parts geopolymer, 80-120 parts composite mineral admixture, 900-1000 parts crushed stone, 700-900 parts washed sand, and 140-160 parts modified coal chemical wastewater.

[0039] By adopting the above technical solution and replacing traditional silicate cement with geopolymer, the low heat, micro-expansion and high water demand of geopolymer can be utilized to solve the problems of poor fluidity, large shrinkage and easy cracking of concrete prepared by traditional silicate cement.

[0040] For example, the amount of the geopolymer can be 260 parts, 270 parts, 280 parts, 290 parts, 300 parts, etc.; the amount of the composite mineral admixture can be 80 parts, 90 parts, 100 parts, 110 parts, 120 parts, etc.; the amount of crushed stone can be 900 parts, 920 parts, 940 parts, 960 parts, 980 parts, 1000 parts, etc.; the amount of washed sand can be 700 parts, 750 parts, 800 parts, 850 parts, 900 parts, etc.; and the amount of modified coal chemical wastewater can be 140 parts, 145 parts, 150 parts, 155 parts, 160 parts, etc.

[0041] According to an embodiment of the present invention, the geopolymer comprises, by weight, 10-20 parts of industrial by-product gypsum, 50-80 parts of slag, 1-10 parts of coal-based solid waste, and 1-20 parts of alkaline activator.

[0042] For example, the amount of industrial by-product gypsum can be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, etc.; the amount of slag can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, etc.; the amount of coal-based solid waste can be 1 part, 3 parts, 5 parts, 8 parts, 10 parts, etc.; and the amount of alkaline activator can be 1 part, 3 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, etc.

[0043] According to an embodiment of the present invention, the coal-based solid waste includes one or more of fly ash, coal gangue, and coal gasification slag.

[0044] According to an embodiment of the present invention, the alkaline activator includes one or more of carbide slag, steel slag, and cement.

[0045] According to an embodiment of the present invention, the composite mineral admixture comprises, by weight: 50-60 parts of mixture, 30-40 parts of metakaolin, 5-10 parts of silica fume, 0-2 parts of polyvinyl propylene, 0.5-2 parts of sodium pyrophosphate, and 0.5-2 parts of triethanolamine.

[0046] By adopting the above scheme, sodium pyrophosphate can be easily adsorbed on the particle surface to form an electric double layer, reducing van der Waals forces, which is beneficial to maintaining particle dispersion and preventing material agglomeration due to grinding, thus reducing grinding efficiency. The hydroxyl and amino groups of triethanolamine can be adsorbed on the particle surface to form a solvation layer, which can further reduce the adhesion between powdered materials through steric hindrance and improve grinding efficiency. Metakaolin participates in hydration to form hydrated calcium silicate gel and hydrated calcium aluminosilicate gel, which can fill the nanopores formed by concrete hydration and improve mechanical properties and impermeability. The ultrafine filling effect of silica fume can fill pores, and its thixotropic effect is beneficial to improving the suspension stability of concrete and avoiding segregation and bleeding. The protonated amino groups on the polyvinyl propylene molecule chain can be adsorbed on the surface of negatively charged ultrafine materials to form an electrostatic repulsion layer, which is beneficial to improving the uniformity of admixtures, avoiding the agglomeration of ultrafine materials such as silica fume and metakaolin, and improving dispersibility.

[0047] For example, the amount of the mixture can be 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, etc.; the amount of metakaolin can be 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, etc.; the amount of silica fume can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.; the amount of polyvinyl propylene can be 0 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, etc.; the amount of sodium pyrophosphate can be 0.5 parts, 1 part, 1.5 parts, 2 parts, etc.; and the amount of triethanolamine can be 0.5 parts, 1 part, 1.3 parts, 1.5 parts, 1.8 parts, 2 parts, etc.

[0048] According to an embodiment of the present invention, the mixture comprises, by weight, 5-10 parts of coal gasification slag, 5-10 parts of ferrosilicon manganese slag, 5-10 parts of bottom ash, 10-15 parts of fly ash, and 3-5 parts of desulfurization gypsum.

[0049] By adopting the above scheme, a large amount of different types of industrial solid waste can be consumed, which is beneficial to reducing environmental pollution, carbon emissions, and production costs. Various types of industrial solid waste are made into a mixture according to a specific ratio. Based on the differences in the chemical and mineral composition of different solid wastes, the mixture can be synergistically designed to effectively activate different industrial solid wastes. This helps to reduce the high residual carbon problem introduced by industrial solid wastes such as coal gasification slag, ferrosilicon slag, furnace bottom ash, fly ash, and desulfurization gypsum in the mixture, reduce the water requirement of the mixture, and improve the fluidity of concrete.

[0050] For example, the amount of gasification slag can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.; the amount of ferrosilicon manganese slag can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.; the amount of bottom ash can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc.; the amount of fly ash can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.; and the amount of desulfurization gypsum can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0051] According to an embodiment of the present invention, the specific surface area of ​​the composite mineral admixture is 500–700 m². 2 / kg. For example, the specific surface area of ​​the composite mineral admixture can be 500 m². 2 / kg, 530m 2 / kg, 550m 2 / kg, 580m 2 / kg, 600m 2 / kg, 630m 2 / kg, 650m 2 / kg, 680m 2 / kg, 700m 2 / kg, etc.

[0052] According to an embodiment of the present invention, the fineness modulus of the washed sand is 2.4 to 2.7. For example, the fineness modulus of the washed sand can be 2.4, 2.5, 2.6, 2.7, etc.

[0053] According to an embodiment of the present invention, the crushed stone satisfies at least one of the following conditions: The particle size of the crushed stone is 5-20 mm; The crushing value of the crushed stone is 6-10%.

[0054] For example, the particle size of the crushed stone can be 5mm, 8mm, 10mm, 13mm, 15mm, 18mm, or 20mm; the crushing value of the crushed stone can be 6%, 7%, 8%, 9%, or 10%, etc.

[0055] According to an embodiment of the present invention, the modified coal chemical wastewater comprises, by weight: 70-80 parts tap water, 2-4 parts calcium nitrate, 20-30 parts high-salt wastewater, 3-5 parts polycarboxylate superplasticizer, 0-0.8 parts isopentenyl polyoxyethylene ether, 0-2 parts hydroxypropyl methylcellulose, and 0-0.5 parts sodium fatty alcohol sulfate.

[0056] By adopting the above schemes, introducing calcium nitrate into tap water can utilize nitrate ions to weaken the electrostatic attraction between powder particles, improving the fluidity of concrete. Secondly, high-salt wastewater contains sodium sulfate, which not only increases the cohesiveness of concrete mixtures, improves water retention, and prevents segregation, but also quickly dissolves and participates in hydration to form ettringite crystals, improving the early mechanical properties of concrete and significantly improving its later mechanical properties. Polycarboxylate superplasticizer can disperse powder particles through electrostatic repulsion and steric hindrance effects, reducing flocculation and increasing water retention and fluidity. The long side chains of isopentenyl polyoxyethylene ether extend in water, adsorbing onto the surface of cement particles to form a physical barrier, preventing particle aggregation, further improving the dispersion ability of powder, and enhancing the mechanical properties of concrete. Hydroxypropyl methylcellulose can increase the viscosity of the solution through the interaction between molecular chains and the hydrogen bonding between molecular chains and water molecules, which is beneficial to enhancing the water saturation effect. Sodium fatty alcohol sulfate can introduce uniform and stable microbubbles into concrete through a triple mechanism of reducing surface tension, electrostatic repulsion, and interfacial film stabilization, significantly improving fluidity and enhancing the self-compacting effect of concrete.

[0057] For example, the amount of tap water can be 70 parts, 73 parts, 75 parts, 78 parts, 80 parts, etc.; the amount of calcium nitrate can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, etc.; the amount of high-salt wastewater can be 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, etc.; the amount of polycarboxylate superplasticizer can be 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.; the amount of isopentenyl polyoxyethylene ether can be 0 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, etc.; the amount of hydroxypropyl methylcellulose can be 0 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, etc.; and the amount of fatty alcohol sulfate can be 0 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, etc.

[0058] According to an embodiment of the present invention, the extension of the self-compacting polymer concrete is greater than 700 mm, specifically such as 700 mm, 705 mm, 710 mm, 715 mm, 720 mm, 730 mm, 740 mm, 750 mm, 780 mm, 800 mm, etc.

[0059] It should be noted that the standard NB / T10077-2024 clearly states that the spread of high self-compacting concrete is greater than 700mm. Therefore, it can be guaranteed that the concrete described in this invention is high self-compacting concrete.

[0060] A second aspect of the present invention provides a method for preparing the above-mentioned self-compacting polymer concrete, comprising: Geopolymer, composite mineral admixture, crushed stone, and washed sand are mixed together, and modified coal chemical wastewater is added in two batches, with stirring after each addition, to obtain geopolymer concrete.

[0061] According to an embodiment of the present invention, the ratio of the amount of modified coal chemical wastewater added in two separate additions is 1:3 to 3:1, specifically 1:3, 1:2, 1:1, 2:1, 3:1, etc.

[0062] According to an embodiment of the present invention, the stirring time after each addition is 60~120s, specifically 60s, 70s, 80s, 90s, 100s, 110s, 120s, etc.

[0063] According to an embodiment of the present invention, the preparation method of the composite mineral admixture includes: The coal gasification slag, ferromanganese slag, furnace bottom ash, fly ash and desulfurization gypsum are mixed and calcined to obtain a mixture. Sodium pyrophosphate was divided into a first part sodium pyrophosphate and a second part sodium pyrophosphate, and triethanolamine was divided into a third part triethanolamine and a fourth part triethanolamine. The mixture, a first part of sodium pyrophosphate, and a third part of triethanolamine are mixed and subjected to a first grinding; metakaolin, a second part of sodium pyrophosphate, and a fourth part of triethanolamine are added and subjected to a second grinding; silica fume and polyvinyl propylene are added and subjected to a third grinding to obtain a composite mineral admixture.

[0064] By adopting the above scheme, sodium pyrophosphate and triethanolamine are first introduced. Sodium pyrophosphate helps maintain particle dispersion and prevents material agglomeration during grinding, thus reducing grinding efficiency. Triethanolamine can further reduce the adhesion between powdered materials through steric hindrance, and its initial addition helps improve grinding efficiency. Then, metakaolin is introduced. On the one hand, metakaolin has good grindability, which can further improve the grinding efficiency of the admixture and increase the fineness of the powder. On the other hand, it can fill the nanopores formed by concrete hydration, improving mechanical properties and impermeability. Finally, silica fume and polyvinyl propylene ammonium are introduced. The ultrafine filling effect of silica fume fills the pores, and its thixotropic effect helps improve the suspension stability of concrete and avoid segregation and bleeding. Polyvinyl propylene ammonium ammonium helps improve the uniformity of the admixture, avoids the agglomeration of ultrafine materials such as silica fume and metakaolin, and improves the overall dispersion of the admixture.

[0065] According to an embodiment of the present invention, the first part of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, the second part of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, and the sum of the percentages of the first part of sodium pyrophosphate and the second part of sodium pyrophosphate in the total amount of sodium pyrophosphate is 100%.

[0066] For example, the percentage of the first amount of sodium pyrophosphate in the total amount of sodium pyrophosphate can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc.; the percentage of the second amount of sodium pyrophosphate in the total amount of sodium pyrophosphate can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc.

[0067] According to an embodiment of the present invention, the third portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, the fourth portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, and the sum of the percentages of the third portion of triethanolamine and the fourth portion of triethanolamine accounts for 100% of the total amount of triethanolamine.

[0068] For example, the percentage of the third portion of triethanolamine in the total amount of triethanolamine used can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc.; the percentage of the fourth portion of triethanolamine in the total amount of triethanolamine used can be 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc.

[0069] In some embodiments, the grinding is performed using an SM-500 cement test mill.

[0070] According to an embodiment of the present invention, the gradient heating-cooling calcination process includes four stages: a first heating, a second heating, a third heating, and a cooling.

[0071] According to an embodiment of the present invention, the calcination employs a gradient heating-cooling calcination process, comprising: Heat to 300-400℃ at a heating rate of 5-10℃ / min, and hold for 15-20 minutes; Heat to 500-700℃ at a heating rate of 3-5℃ / min, and hold for 20-30 minutes; Heat to 900-1000℃ at a heating rate of 2-4℃ / min, and hold for 40-60 min; Cool down to room temperature at a rate of 10–15 °C / min and hold for 40–60 min.

[0072] Through the above implementation scheme, the activation and modification of various industrial solid wastes in composite mineral admixtures are completed by adopting a gradient heating-cooling calcination system. This can reduce the high residual carbon problem introduced by industrial solid wastes such as coal gasification slag, ferrosilicon manganese slag, furnace bottom ash, fly ash, and desulfurization gypsum in the mixture, reduce the water demand ratio of the mixture, and improve the fluidity of concrete. At the same time, the gradient calcination system can also reduce the adsorption capacity of high residual carbon for admixtures, reduce the amount of water-reducing agent in concrete, and save production costs.

[0073] For example, the above calcination can be performed by heating to 300℃, 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, 380℃, 390℃ or 400℃ at a heating rate of 5℃ / min, 6℃ / min, 7℃ / min, 8℃ / min or 9℃ / min or 10℃ / min, and holding at that temperature for 15min, 16min, 17min, 18min, 19min or 20min; Heat at a heating rate of 3℃ / min, 4℃ / min or 5℃ / min to 500℃, 520℃, 540℃, 560℃, 580℃, 600℃, 620℃, 640℃, 660℃, 680℃ or 700℃ and hold for 20min, 22min, 24min, 25min, 28min or 30min. Heat at a heating rate of 2℃ / min, 3℃ / min or 4℃ / min to 900℃, 910℃, 920℃, 930℃, 940℃, 950℃, 960℃, 970℃, 980℃, 990℃ or 1000℃ and hold for 40min, 45min, 50min, 55min or 60min. Cool down to room temperature at a rate of 10℃ / min, 11℃ / min, 12℃ / min, 13℃ / min, 14℃ / min or 15℃ / min and hold for 40 min, 45 min, 50 min, 55 min or 60 min respectively.

[0074] In some embodiments, the preparation method further includes magnetic separation after calcination.

[0075] According to the technical solution of the present invention, the above preparation method further includes at least one of the following additional technical features: The grinding time for the first grinding process is 70–90 minutes; The interval after the first grinding is 30 to 60 minutes; The grinding time for the second grinding process is 20–30 minutes; The interval after the second grinding is 30 to 60 minutes; The grinding time for the third grinding process is 20 to 30 minutes.

[0076] For example, the grinding time of the first grinding can be 70 min, 72 min, 75 min, 78 min, 80 min, 82 min, 85 min, 88 min, 90 min, etc.; the interval time after the first grinding can be 30 min, 32 min, 35 min, 38 min, 40 min, 42 min, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min, 60 min, etc.; the grinding time of the second grinding can be 20 min, 21 min, 22 min, 23 min, 24 min, etc. The interval time after the second grinding can be 30 min, 32 min, 35 min, 38 min, 40 min, 42 min, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min, 60 min, etc.; the grinding time of the third grinding can be 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min, 30 min, etc.

[0077] According to an embodiment of the present invention, the method for preparing the modified coal chemical wastewater includes: Mix tap water and calcium nitrate together and let stand. Add high-salt wastewater and polycarboxylate superplasticizer for a second mixing and let stand; Add isopentenyl polyoxyethylene ether, hydroxypropyl methylcellulose, and sodium fatty alcohol sulfate and mix to obtain modified coal chemical wastewater.

[0078] By adopting the above technical solutions, it is beneficial to prevent aggregation, improve crystal purity and reaction degree, and increase the utilization rate of raw materials such as wastewater, thereby improving the fluidity, strength, self-compacting properties of concrete.

[0079] According to an embodiment of the present invention, the method for preparing the modified coal chemical wastewater further includes at least one of the following additional technical features: The mixing time for the first mixing and settling is 15-20 minutes; The settling time for the first mixture is 5 to 10 minutes; The mixing time for the second mixing and settling is 15-20 minutes; The settling time for the second mixture is 5 to 10 minutes; The mixing and stirring time is 20 to 40 minutes.

[0080] By adopting the above technical solutions, it is beneficial to avoid problems such as limited mass transfer due to insufficient mixing, incomplete lattice / oxidation reaction due to too short a settling time, and marginal gain and decreased device turnover rate due to too long a settling time.

[0081] For example, the mixing time for the first mixing and settling can be 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, etc., and the settling time for the first mixing can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.; the mixing time for the second mixing and settling can be 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, etc., and the settling time for the second mixing can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.; the mixing and stirring time can be 20 min, 25 min, 30 min, 35 min, 40 min, etc.

[0082] According to an embodiment of the present invention, a Physical Information Neural Network (PINN) model is used to select the dosage of each component in the composite mineral admixture and the calcination process parameters.

[0083] According to an embodiment of the present invention, the selection of the dosage of each component in the composite mineral admixture and the calcination process parameters using the PINN model includes: Collect characteristic data such as chemical composition, particle size distribution, and residual carbon content of industrial solid waste, and record the current calcination process parameters and the corresponding performance indicators of the mixture; The characteristic data, calcination process parameters, and performance indicators are integrated, cleaned, and normalized. A PINN model is constructed using the respective amounts of the industrial solid wastes and the calcination process parameters as neurons. By adopting the above scheme, the normalization process is conducive to the accurate identification and utilization of these characteristic data by the subsequent model. The dosage of each of the coal gasification slag, ferromanganese slag, bottom ash, fly ash and desulfurization gypsum is used as 5 neurons, and the parameters of each stage of the calcination process are used as a total of 7 neurons. This fully considers the situation of different solid waste combinations and different calcination processes, so that the model can perform performance prediction and optimization according to different solid waste ratios and calcination processes.

[0084] It should be noted that the chemical composition includes the content of major oxides such as SiO2, Al2O3, CaO, and Fe2O3; the particle size distribution is the proportion of particle content in each particle size range as determined by a laser particle size analyzer; and the residual carbon content is the content of residual carbon at a specific temperature as determined by a thermogravimetric analyzer.

[0085] In some embodiments, the industrial solid waste includes coal gasification slag, ferrosilicon slag, furnace bottom ash, fly ash, and desulfurization gypsum.

[0086] In some embodiments, the calcination process parameters include one or more of the following: heating rate, holding temperature, holding time, and cooling rate at each stage.

[0087] In some embodiments, the performance indicators include one or more of water demand ratio, activity index, and flowability.

[0088] According to an embodiment of the present invention, the PINN model further includes at least one of the following technical features: The PINN model uses multiple fully connected layers to form hidden layers, including three hidden layers, each containing 64, 128, and 64 neurons respectively. The PINN model uses ReLU as the activation function. The output layer of the PINN model corresponds to the performance metric.

[0089] By adopting the above scheme, physical equations, such as heat conduction equations and chemical reaction kinetic equations, can be introduced into the hidden layers as prior knowledge of the neural network.

[0090] In some embodiments, the PINN model solves the physical or chemical problems involved by means of the following equations: (1) During the calcination process, heat conduction follows Fourier's law and the heat conduction equation. The temperature distribution T(x,t) inside the composite mineral admixture satisfies the following partial differential equation:

[0091] Where α is the thermal diffusivity; 2 T is the Laplace operator for the temperature field; x is the spatial coordinate; t is time; Q(x,t) is the internal heat source term (such as internal heat sources like exothermic chemical reactions).

[0092] (2) Taking the oxidation reaction of residual carbon as an example, assuming the volume fraction of residual carbon is C(x,t), its chemical reaction kinetic equation is:

[0093] Where k(T) is the temperature-dependent reaction rate constant, which usually follows the Arrhenius equation. (Where, k0 is the pre-exponential factor; E) a (where R is the activation energy, R is the gas constant, and n is the reaction order).

[0094] (3) Within solid waste particles, the migration of matter can be described by Fick's law. For a certain concentration S(x,t), the diffusion equation is:

[0095] Where D is the diffusion coefficient; 2 S is the Laplace operator; S is the concentration field. According to embodiments of the present invention, incorporating these physical equations as constraints into neural network training ensures that the model's predictions conform to physical laws by minimizing the loss function, while simultaneously improving the accuracy of performance predictions for composite mineral admixtures. During model training, using samples containing data on the characteristics of different industrial solid wastes enables the model to learn the mapping relationship between the performance of the mixture under different solid waste ratios and calcination processes, as well as the intrinsic connection between these variables and the physical processes. By minimizing the loss function, the model's predictions not only conform to the actual measured performance data but also meet the requirements of physical laws for different solid waste characteristics.

[0096] In some embodiments, the loss function L total Including data error term L data And physical information error term L physics The loss function satisfies the following formula:

[0097] in, and These are weighting coefficients used to balance the relative importance of data error terms and physical information error terms.

[0098] It should be noted that the data error term can be used to measure the difference between the performance indicators of the composite mineral admixture predicted by the model and the actual measured values. For example, if the performance indicators include water requirement ratio w, activity index a, and flowability f, then the data error term L... data It can be represented as:

[0099] Where: N data The number of training data samples; These are the performance indicators predicted by the model, such as water demand ratio w, activity index a, and flowability f. These are the actual measured performance indicators mentioned above.

[0100] The physical information error term includes thermal conduction error, chemical reaction kinetics error, mass transfer error, and hydrodynamic error: The heat conduction error measures the deviation between the temperature distribution predicted by the model and the heat conduction equation. heatIt can be represented as:

[0101] Where: N heat α represents the number of samples used to calculate the thermal conduction error; α is the thermal diffusivity. 2 For the Laplace operator; The temperature predicted by the model; This is an internal heat source item.

[0102] Chemical reaction kinetic error measures the deviation between the model-predicted residual char volume fraction and the chemical reaction kinetic equation. The chemical reaction kinetic error L... chem It can be represented as:

[0103] Where, N chem This is the number of samples used to calculate the error in chemical reaction kinetics; The reaction rate constant is temperature-dependent. This represents the volume fraction of residual carbon predicted by the model.

[0104] Mass transfer error measures the deviation between the predicted substance concentration by the model and the mass transfer equation. The mass transfer error L... mass It can be represented as:

[0105] Where, N mass This is the number of samples used to calculate the mass transfer error; This represents the concentration of the substance predicted by the model.

[0106] Fluid dynamics error measures the deviation between the model's predicted flow behavior of concrete mixtures and the fluid dynamics equations. For the generalized Newtonian fluid model, its stress-strain relationship is: (Where, τ is the shear stress;) It is a viscosity that depends on the shear rate; (This refers to the shear rate). Based on this, the fluid dynamics error can be expressed as:

[0107] Where: N fluid This represents the number of samples used to calculate the fluid dynamics error. The shear stress predicted by the model; This represents the shear rate predicted by the model.

[0108] Therefore, considering all the errors mentioned above, the physical information error term L physics It can be represented as:

[0109] in, These are the weighting coefficients for different errors.

[0110] In some cases, a dynamic weight adjustment method based on sensitivity analysis is used during training to reasonably adjust the weight ω of the data error term according to the rate of change of data error and the rate of change of physical error. data And the weight ω of the physical information error term physics .

[0111] According to embodiments of the present invention, the model can more accurately reflect the influence of different industrial solid waste characteristics on the performance of the mixture, avoiding the problem of inaccurate model predictions due to the weight of certain characteristic data being too small or too large.

[0112] Specifically, the dynamic weight adjustment method includes: Parameter initialization, initial setting of the weight ω of the data error term. data =0.5, weight ω of physical information error term physics =0.5; Define the adjustment step size, and set the step size for each weight adjustment to Δω=0.05; Set the loss change threshold as =0.1, used to determine whether to perform weight adjustment; Calculate the total loss function L total Data error term L data And physical information error term L physics ; The weights are dynamically adjusted, and the rate of change of loss of the data error term and the physical information error term in the current iteration and the previous iteration is calculated. Adjust the weights based on the rate of change of loss; After each training iteration, the loss function is repeatedly calculated and the weights are adjusted; a maximum number of iterations or a target loss value is set, and adjustments are stopped when this condition is met.

[0113] It should be noted that the rate of change r of the data error term data The calculation is performed using the following formula: ,in, This is the current data value. These are historical data values; The rate of change r of the physical information error term physics The calculation is performed using the following formula: ,in, This is the current physical value; These are historical physics values.

[0114] It should be noted that the weight adjustment based on the rate of change of loss includes: if and This indicates that the data fitting effect has deteriorated, and ω needs to be increased. data ,but: At the same time, according to Calculate the corresponding ω physics value; if and If the rate of change of loss is within the threshold range, then the current weight remains unchanged.

[0115] A third aspect of the present invention provides the application of the above-described self-compacting polymer concrete and / or the self-compacting polymer concrete prepared by the above-described preparation method in dams.

[0116] According to an embodiment of the present invention, the application includes adding the self-compacting polymer concrete into the stacked riprap body to fill the voids and form it.

[0117] The present invention will be explained below with reference to embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0118] The geopolymers described in the following examples and comparative examples were purchased from Ningxia Jia Hui Construction Technology Co., Ltd. as GPMⅡ-42.5 type geopolymer.

[0119] Example 1-1 Preparation of the mixture Mix 10 parts coal gasification slag, 5 parts ferrosilicon manganese slag, 10 parts furnace bottom ash, 10 parts fly ash and 5 parts desulfurization gypsum, heat to 300℃ at a heating rate of 5℃ / min and hold for 15 min; heat to 500℃ at a heating rate of 3℃ / min and hold for 20 min; heat to 900℃ at a heating rate of 4℃ / min and hold for 40 min; cool to room temperature at a cooling rate of 10℃ / min and hold for 40 min to obtain the mixture.

[0120] Examples 1-2, 1-3 and Comparative Examples 1-1 to 1-4 were prepared according to the preparation process of Example 1-1 above, and the mixtures were prepared according to the formulas and parameters given in Table 1.

[0121] Table 1. Formulations and process parameters for preparing the mixtures in the examples and comparative examples.

[0122] Example 2-1 Preparation of composite mineral admixtures Mix 50 parts of the mixture prepared in Example 1-1, 0.5 parts of sodium pyrophosphate, and 1.5 parts of triethanolamine, and mill for 90 min; after 30 min, add 30 parts of metakaolin, 1.5 parts of sodium pyrophosphate, and 0.5 parts of triethanolamine, and mill for 20 min; after 30 min, add 8 parts of silica fume, and mill for 20 min to obtain a specific surface area of ​​509 m². 2 / kg of composite mineral admixture.

[0123] Examples 2-2, 2-3 and Comparative Examples 2-1 to 2-4 were prepared according to the preparation process of Example 2-1 above, and the composite mineral admixtures were prepared according to the formulas and parameters given in Table 2.

[0124] Table 2. Formulations and process parameters for preparing composite mineral admixtures in the examples and comparative examples.

[0125] Example 3-1 Preparation of Modified Coal Chemical Wastewater Mix 70 parts tap water and 2 parts calcium nitrate and let stand for 15 minutes, then let stand for 5 minutes. Add 20 parts of high-salt wastewater and 4 parts of polycarboxylate superplasticizer for a second mixing and standing, wherein the mixing is stirred for 18 minutes and then stood for 5 minutes. Add 2 parts of hydroxypropyl methylcellulose and mix for 20 minutes to obtain modified coal chemical wastewater.

[0126] Examples 3-2, 3-3 and Comparative Examples 3-1, 3-2 were prepared according to the preparation process of Example 3-1 above, and modified coal chemical wastewater was prepared according to the formula and parameters given in Table 3.

[0127] Table 3. Formulations and process parameters for preparing modified coal chemical wastewater in the examples and comparative examples.

[0128] Example 4-1 280 parts of geopolymer, 100 parts of composite mineral admixture prepared in Example 2-1, 960 parts of 5-20mm crushed stone, and 780 parts of washed sand were added to a mixer and mixed for 2 minutes. Then, 76 parts of modified coal chemical wastewater prepared in Example 3-1 were added and mixed for 90 seconds. Finally, 76 parts of modified coal chemical wastewater prepared in Example 3-1 were added again and mixed for 90 seconds to obtain geopolymer concrete.

[0129] Examples 4-2 to 4-6 and Comparative Examples 4-1 to 4-7 were prepared according to the preparation process of Example 4-1 above, and the geopolymer concrete was prepared according to the formula and parameters given in Table 4.

[0130] Table 4. Formulations and process parameters for preparing geopolymer concrete in the examples and comparative examples.

[0131] Effect test According to GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete" and GB / T 50082-2024 "Standard for Test Methods of Long-Term Performance and Durability of Concrete", the concrete prepared in Examples 4-1 to 4-6 and Comparative Examples 4-1 to 4-5 were tested for workability, mechanical properties, etc., and the results are recorded in Table 5.

[0132] Table 5 Performance test results of geopolymer concrete

[0133] As shown in Table 5, the workability, chloride ion erosion resistance, and sulfate erosion resistance of the self-compacting polymer concrete prepared in Examples 4-1 to 4-6 of this invention are significantly improved compared to the comparative examples. In particular, Example 4-2, compared to Comparative Example 4-1, shows a 30% increase in slump, a 24% increase in spread, a 16% increase in water retention, an 87% reduction in electrical flux, and a two-level improvement in sulfate erosion resistance. This may be because the all-solid waste cementitious material itself has a large specific surface area and a large water requirement, exhibiting good water retention and improving the workability of the concrete. Simultaneously, its hydration produces hydration products, primarily ettringite, which enhances the concrete's erosion resistance.

[0134] Compared with Comparative Examples 4-2 to 4-7, Examples 4-1 and 4-4 show that the addition of calcium nitrate, water-reducing agent, isopentenyl polyoxyethylene ether, hydroxypropyl methylcellulose, and sodium fatty alcohol sulfate, along with the gradient heating-cooling calcination process and the two-stage addition of sodium pyrophosphate and triethanolamine, significantly improved the workability and mechanical properties of geopolymer concrete, while also improving its durability. In particular, compared with Comparative Example 4-3, Example 4-4 showed a 21% increase in slump, a 16% increase in spread, a 32% increase in consistency, a 23% increase in 28-day compressive strength, a 70% reduction in electrical flux, and a 3-level improvement in impermeability, demonstrating significant improvements in all aspects of performance. Compared with Comparative Example 4-4, Example 4-1 showed that the addition of sodium pyrophosphate, triethanolamine, and polyvinyl propyleneamine significantly improved the workability of geopolymer concrete, while also improving its durability.

[0135] Therefore, this application achieves the preparation of high-flowability, shrinkage-resistant, and self-compacting geological polymer concrete and the resource utilization of industrial solid waste by preparing composite mineral admixtures according to specific proportions and specific calcination processes using the coupling effect among geological polymers, composite mineral admixtures, and modified coal chemical wastewater.

[0136] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "one implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0137] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-compacting polymer concrete, characterized in that, By weight, it comprises the following components: 260-300 parts geopolymer, 80-120 parts composite mineral admixture, 900-1000 parts crushed stone, 700-900 parts washed sand, and 140-160 parts modified coal chemical wastewater.

2. The concrete according to claim 1, characterized in that, By weight, the composite mineral admixture comprises: 50-60 parts of mixture, 30-40 parts of metakaolin, 5-10 parts of silica fume, 0-2 parts of polyvinyl propylene, 0.5-2 parts of sodium pyrophosphate, and 0.5-2 parts of triethanolamine.

3. The concrete according to claim 2, characterized in that, By weight, the mixture comprises: 5-10 parts of coal gasification slag, 5-10 parts of ferrosilicon manganese slag, 5-10 parts of furnace bottom ash, 10-15 parts of fly ash, and 3-5 parts of desulfurization gypsum.

4. The concrete according to claim 1, characterized in that, By weight, the modified coal chemical wastewater comprises: 70-80 parts tap water, 2-4 parts calcium nitrate, 20-30 parts high-salt wastewater, 3-5 parts polycarboxylate superplasticizer, 0-0.8 parts isopentenyl polyoxyethylene ether, 0-2 parts hydroxypropyl methylcellulose, and 0-0.5 parts sodium fatty alcohol sulfate.

5. The concrete according to any one of claims 1 to 4, characterized in that, The specific surface area of ​​the composite mineral admixture is 500-700 m². 2 / kg.

6. A method for preparing self-compacting polymer concrete as described in any one of claims 1 to 5, characterized in that, include: The geopolymer, composite mineral admixture, crushed stone, and washed sand are mixed together. Modified coal chemical wastewater was added in two batches, with stirring after each addition, to obtain geopolymer concrete.

7. The preparation method according to claim 6, characterized in that, The preparation method of the composite mineral admixture includes: The coal gasification slag, ferromanganese slag, furnace bottom ash, fly ash and desulfurization gypsum are mixed and calcined to obtain a mixture. Sodium pyrophosphate was divided into a first part sodium pyrophosphate and a second part sodium pyrophosphate, and triethanolamine was divided into a third part triethanolamine and a fourth part triethanolamine. The mixture, a first part of sodium pyrophosphate, and a third part of triethanolamine are mixed and subjected to a first grinding; metakaolin, a second part of sodium pyrophosphate, and a fourth part of triethanolamine are added and subjected to a second grinding; silica fume and polyvinyl propylene are added and subjected to a third grinding to obtain a composite mineral admixture. Optionally, the first portion of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, the second portion of sodium pyrophosphate accounts for 25% to 75% of the total amount of sodium pyrophosphate, and the sum of the percentages of the first portion of sodium pyrophosphate and the second portion of sodium pyrophosphate in the total amount of sodium pyrophosphate is 100%. Optionally, the third portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, the fourth portion of triethanolamine accounts for 25% to 75% of the total amount of triethanolamine, and the sum of the percentages of the third portion of triethanolamine and the fourth portion of triethanolamine accounts for 100% of the total amount of triethanolamine.

8. The preparation method according to claim 7, characterized in that, The calcination process employs a gradient heating-cooling process, including: Heat to 300-400℃ at a heating rate of 5-10℃ / min, and hold for 15-20 minutes; Heat to 500-700℃ at a heating rate of 3-5℃ / min, and hold for 20-30 minutes; Heat to 900-1000℃ at a heating rate of 2-4℃ / min, and hold for 40-60 min; Cool down to room temperature at a rate of 10–15 °C / min and hold for 40–60 min.

9. The preparation method according to any one of claims 6 to 8, characterized in that, The method for preparing the modified coal chemical wastewater includes: Mix tap water and calcium nitrate together and let stand. Add high-salt wastewater and polycarboxylate superplasticizer for a second mixing and let stand; Add isopentenyl polyoxyethylene ether, hydroxypropyl methylcellulose, and sodium fatty alcohol sulfate and mix to obtain modified coal chemical wastewater.

10. The application of self-compacting polymeric concrete as described in any one of claims 1 to 5 and / or self-compacting polymeric concrete prepared by the preparation method described in any one of claims 6 to 9 in dams.

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