Alkali-activated recycled brick powder geopolymer, preparation method thereof and strength calculation method thereof

Abstract

The application discloses alkali fusion activated recycled brick powder geopolymer and a preparation method and strength calculation method thereof, the geopolymer comprises the following components in parts by mass: water 20-30 parts, fluxing agent 3-5 parts, alkali fusion activated recycled brick powder 20-60 parts, precursor material 40-80 parts, alkali activator 5-7 parts; wherein, the alkali fusion activated recycled brick powder preparation method: 1) the recycled brick powder is placed in an oven for drying, then the recycled brick powder is ground until the recycled brick powder particle size meets the requirements; 2) the ground recycled brick powder is mixed and stirred with the fluxing agent, then it is placed in a muffle furnace for calcination, and the alkali fusion activated recycled brick powder is obtained after natural cooling. The application is based on recycled brick powder to prepare geopolymer, through optimizing component matching ratio design and preparation process, the goals of high performance, environmental protection and sustainable development are realized. The strength calculation method of the application effectively predicts the strength development of the geopolymer, and has practical application value.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically, to an alkali-fused activated recycled brick powder polymer, its preparation method, and its strength calculation method. Background Technology

[0002] Cement, as a fundamental material in modern construction, generates substantial carbon dioxide emissions during its production. This process not only exacerbates the environmental burden but also intensifies global climate change. Meanwhile, brick dust, a byproduct of construction and demolition activities, has become a pressing environmental problem due to its large-scale stockpiling. The accumulation of brick dust not only occupies valuable land resources but may also lead to soil and water pollution, threatening ecosystems.

[0003] Faced with these challenges, the application of recycled brick powder has received widespread attention as a way to reduce environmental impact. Currently, most research and practical applications of recycled brick powder focus on its use as recycled aggregate, which is then incorporated into new concrete mixes. However, the potential of recycled brick powder extends beyond its role as an aggregate substitute. The development of geopolymer materials using recycled brick powder as a sustainable alternative to traditional cement-based products has also attracted attention. These geopolymers not only offer a way to utilize waste but also reduce the carbon footprint associated with conventional cement production. Existing technologies investigate the effects of different modifications of recycled concrete powder and recycled brick powder on the compressive strength of cement-based materials. Recycled concrete powder contains calcite, dolomite, and small amounts of C2S and C3S. After modification, the compressive strength of cement-based materials increases by 23.2%. Modification methods include physical modification, chemical modification, thermal modification, carbonization modification, and nano-modification. Recycled brick powder's main mineral component is quartz, with small amounts of hematite, albite, and muscovite. Current research only focuses on physically and chemically modified brick powder, and the compressive strength of cement-based materials after modification only increases slightly by 11.6%, which is less than the increase in compressive strength after modification of recycled concrete powder. Therefore, there is an urgent need to conduct systematic research on effectively improving the activity of recycled brick powder based on its chemical and mineral composition characteristics.

[0004] Despite growing scholarly interest in recycled brick powder polymers, a significant gap remains in their strength calculation capabilities. The lack of comprehensive strength calculation methods for recycled brick powder polymers limits the full realization of these materials' potential in building applications. Summary of the Invention

[0005] The purpose of this invention is to provide an alkali-fused activated recycled brick powder geopolymer, its preparation method, and its strength calculation method. The preparation is simple and convenient, allowing for the full utilization of recycled brick powder from construction waste. Through alkali-fused activation technology, a novel cementitious material is prepared, effectively improving the strength of the geopolymer and significantly reducing carbon emissions. The strength calculation formula mentioned in this invention can be effectively combined with mix design studies to predict the strength of the geopolymer, possessing broad application prospects and research reference value.

[0006] In view of this, the present invention adopts the following technical solution:

[0007] An alkali-fused activated recycled brick powder polymer comprises the following components in parts by weight:

[0008] 20-30 parts water, 20-60 parts alkali-activated recycled brick powder, 40-80 parts precursor material, and 5-7 parts alkali activator;

[0009] The alkali-fused activated recycled brick powder is prepared by the following steps:

[0010] Step a1: Place the recycled brick powder in an oven to dry for at least 24 hours, and then grind the recycled brick powder until the particle size of the recycled brick powder meets the requirements;

[0011] Step a2: Mix the ground recycled brick powder with the flux and stir until uniform. Then place it in a muffle furnace and calcine at 200°C for 6 hours with a heating rate of 20°C / min. After natural cooling, the alkali-fused activated recycled brick powder is obtained.

[0012] Furthermore, in step a1, by mass, the flux is 3-5 parts, the recycled brick powder is 20-60 parts, the drying temperature in the oven is 60℃, the drying time is at least 24 hours, and the particle size requirement is no greater than 0.2mm. A finer recycled brick powder particle size can make it more active.

[0013] Furthermore, the flux is one of lithium metaborate, barium fluoride, and ammonium chloride, with a mass concentration of 20%-40%.

[0014] Furthermore, the silica content in the recycled brick powder is not less than 45%.

[0015] Furthermore, the precursor material is one of marble sawdust, steel slag, and metakaolin, with a calcium content of not less than 40%.

[0016] Furthermore, the alkaline activator is one of potassium hydroxide, potassium silicate, and sodium metasilicate, with a mass concentration of 20%-40%.

[0017] A method for preparing the alkali-fused activated recycled brick powder geopolymer includes the following steps:

[0018] Step 1: Mix water and alkali activator evenly to obtain a mixed solution; add the alkali-activated recycled brick powder and the precursor material to a mixing pot, mix thoroughly to obtain a mixed powder;

[0019] Step 2: Mix and stir the mixed powder with the mixed solution to finally obtain the alkali-activated recycled brick powder polymer.

[0020] Furthermore, during the mixing and stirring process of the mixed powder and the mixed solution:

[0021] Stir slowly for 60 seconds, pause for 15 seconds, scrape off the slurry from the sides of the mixing bowl, continue stirring quickly for 60 seconds, and finally stir slowly for 30 seconds.

[0022] The stirring speeds for the slow stirring and fast stirring are 90-100 r / min and 250-260 r / min, respectively.

[0023] A method for calculating the strength of the alkali-fused activated recycled brick powder polymer, wherein the formula for the strength calculation method is as follows:

[0024]

[0025] In the formula: C is the 28-day compressive strength of the alkali-activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 S1 represents the total mass fraction of alkali-activated recycled brick powder, precursor materials, and alkali activator; S1, K1, and K2 are correction factors for precursor materials, flux, and alkali activator, respectively, and their values ​​depend on the specific types of precursor materials, flux, and alkali activator.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This invention utilizes an innovative alkali-fusion activation technology, combining physical and chemical modification, to significantly increase the active silicon-aluminum content of recycled brick powder, thus promoting the depolymerization-condensation reaction in the subsequent alkali activation step. This not only effectively reduces the problem of waste brick powder stockpiling and lowers its potential environmental pollution, but also opens up a new path for the resource utilization of construction waste, turning waste into treasure and promoting the green and sustainable development of the construction industry.

[0028] 2. This invention significantly reduces the amount of traditional cement used by converting activated recycled brick powder into a high-performance cementitious material. This transformative application not only reduces carbon emissions generated during cement production but also makes a positive contribution to reducing greenhouse gas emissions and addressing climate change, embodying the concept of green environmental protection.

[0029] 3. This invention ingeniously integrates industrial by-products such as marble sawdust, steel slag, and metakaolin. These materials are not only low-cost, but using them as raw materials also helps reduce industrial waste emissions, playing a positive role in environmental protection. This efficient use of resources is both economical and environmentally friendly, achieving a win-win situation for both economic and environmental benefits.

[0030] 4. The alkali-fused activated recycled brick powder geopolymer developed in this invention has broad application prospects. It can be widely used in many fields such as construction, roads, and bridges, and can bring multiple benefits to these fields, such as improving structural strength, extending service life, and reducing maintenance costs, demonstrating its outstanding technical advantages and market potential.

[0031] 5. The operation process of this invention is simple and the preparation process is easy to master, making industrial production possible. By adding industrial by-products and alkali activators, not only are the properties of the cementitious materials optimized, but the strength of its final product, alkali-fused activated recycled brick powder polymer, is also significantly improved, providing strong support for the innovation of building materials.

[0032] 6. This invention proposes a formula for calculating the strength of geopolymer based on alkali-melting activation. This formula has been rigorously verified by experiments and can accurately and effectively predict the strength development of the alkali-melting activated recycled brick powder geopolymer of this invention, laying a solid foundation for in-depth research and technological progress in related fields. Detailed Implementation

[0033] To make the usage and features of this invention more apparent and understandable, specific embodiments are provided below for detailed explanation. Unless otherwise specified, the methods of this invention are conventional methods in the art.

[0034] Furthermore, the numerical range in this invention should be understood to specifically disclose each intermediate value between the upper and lower limits of the range, and the values ​​should not be limited to the upper and lower limits or specific instances.

[0035] The alkali-fused activated recycled brick powder polymer of the present invention comprises the following components in parts by weight:

[0036] 20-30 parts water, 20-60 parts alkali-activated recycled brick powder, 40-80 parts precursor material, and 5-7 parts alkali activator;

[0037] The alkali-fused activated recycled brick powder is prepared by the following steps:

[0038] Step a1: Place the recycled brick powder in a 60℃ oven to dry for at least 24 hours, and then grind the recycled brick powder until the particle size of the recycled brick powder is no greater than 0.2mm;

[0039] Step a2: Mix the ground recycled brick powder with the flux and stir until uniform. Then place it in a muffle furnace and calcine at 200°C for 6 hours with a heating rate of 20°C / min. After natural cooling, the alkali-fused activated recycled brick powder is obtained.

[0040] Preferably, the flux is any one of lithium metaborate, barium fluoride, and ammonium chloride, with a mass concentration of 20%-40%.

[0041] Preferably, the recycled brick powder has a particle size of no more than 0.2 mm and a silica content of no less than 45%.

[0042] Preferably, the method for preparing alkali-fused activated recycled brick powder includes:

[0043] Preferably, the precursor material is any one of marble sawdust, steel slag, and metakaolin, and its calcium content is not less than 40%.

[0044] Preferably, the alkaline activator is one of potassium hydroxide, potassium silicate, and sodium metasilicate, with a mass concentration of 20%-40%.

[0045] Preferably, the preparation method of the alkali-fused activated recycled brick powder geopolymer includes:

[0046] Step 1: Mix water and alkali activator evenly to obtain a mixed solution; add the alkali-activated recycled brick powder and the precursor material to a mixing pot, mix thoroughly to obtain a mixed powder;

[0047] Step 2: Mix and stir the mixed powder with the mixed solution to finally obtain the alkali-activated recycled brick powder polymer.

[0048] Preferably, during the mixing and stirring process of the mixed powder and the mixed solution:

[0049] First, stir slowly for 60 seconds, pause for 15 seconds, scrape off the slurry from the wall of the mixing pot, continue stirring quickly for 60 seconds, and finally stir slowly for 30 seconds; the stirring speeds for the slow and fast stirring are 90-100 r / min and 250-260 r / min, respectively.

[0050] After obtaining the alkali-activated recycled brick powder polymer, it was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days to test its compressive strength.

[0051] To facilitate understanding of the content described in this invention, the technical solutions of this invention will be further explained below with reference to specific implementation examples; however, this invention is not limited thereto. All examples were prepared according to the above-described laboratory methods.

[0052] Example 1

[0053] By weight, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 3 parts of ammonium chloride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 30 parts of water and 5 parts of sodium metasilicate alkali activator were mixed evenly to obtain solution 1. 60 parts of alkali-activated recycled brick powder and 40 parts of marble sawdust were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, it was slowly stirred at 90 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 250 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 25.47MPa.

[0054] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is marble sawdust, S1 = 1.1; when the flux is ammonium chloride, K1 = 1; when the alkali activator is sodium metasilicate, K2 = 0.1.

[0055]

[0056] It can be seen that the error between the strength calculation formula and the actual measured 28-day compressive strength is no more than 5%.

[0057] Example 2

[0058] By mass, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 5 parts of barium fluoride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 20 parts of water and 7 parts of potassium hydroxide alkali activator were mixed evenly to obtain solution 1. 20 parts of alkali-activated recycled brick powder and 80 parts of metakaolin were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 100 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 260 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 101.24MPa.

[0059] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is metakaolin, S1 = 1.12; when the flux is barium fluoride, K1 = 3; and when the alkali activator is potassium hydroxide, K2 = 0.3.

[0060]

[0061] It can be seen that the error between the strength calculation formula and the actual measured 28-day compressive strength is no more than 5%.

[0062] Example 3

[0063] By weight, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 4 parts of lithium metaborate flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 25 parts of water and 6 parts of potassium silicate alkali activator were mixed evenly to obtain solution 1. 40 parts of alkali-activated recycled brick powder and 60 parts of steel slag were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 95 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 255 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 57.82MPa.

[0064] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is steel slag, S1 = 1.11; when the flux is lithium metaborate, K1 = 2; and when the alkali activator is potassium silicate, K2 = 0.2.

[0065]

[0066] It can be seen that the error between the strength calculation formula and the actual measured 28-day compressive strength is no more than 5%.

[0067] Example 4

[0068] By weight, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 5 parts of barium fluoride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 30 parts of water and 5 parts of potassium silicate alkali activator were mixed evenly to obtain solution 1. 60 parts of alkali-activated recycled brick powder and 40 parts of metakaolin were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 100 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 260 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 46.15MPa.

[0069] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is metakaolin, S1 = 1.12; when the flux is barium fluoride, K1 = 3; and when the alkali activator is potassium silicate, K2 = 0.2.

[0070]

[0071] The error between the strength calculation formula and the actual measured 28-day compressive strength does not exceed 5%.

[0072] Example 5

[0073] By mass, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 4 parts of ammonium chloride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 20 parts of water and 7 parts of potassium hydroxide alkali activator were mixed evenly to obtain solution 1. 40 parts of alkali-activated recycled brick powder and 60 parts of steel slag were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 100 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 260 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 50.69MPa.

[0074] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is steel slag, S1 = 1.11; when the flux is ammonium chloride, K1 = 1; and when the alkali activator is potassium hydroxide, K2 = 0.3.

[0075]

[0076] The error between the strength calculation formula and the actual measured 28-day compressive strength does not exceed 5%.

[0077] Example 6

[0078] By weight, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 3 parts of ammonium chloride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 25 parts of water and 6 parts of potassium hydroxide alkali activator were mixed evenly to obtain solution 1. 60 parts of alkali-activated recycled brick powder and 40 parts of marble sawdust were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 90 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 250 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 31.75MPa.

[0079] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is marble sawdust, S1 = 1.1; when the flux is ammonium chloride, K1 = 1; when the alkali activator is potassium hydroxide, K2 = 0.3; This yields...

[0080]

[0081] The error between the strength calculation formula and the actual measured 28-day compressive strength does not exceed 5%.

[0082] Example 7

[0083] By weight, 100 parts of recycled brick powder were dried in a 60℃ oven for 24 hours, then thoroughly mixed with 3 parts of ammonium chloride flux. After uniform mixing, the mixture was calcined in a muffle furnace at 200℃ for 6 hours to obtain alkali-activated recycled brick powder. 20 parts of water and 5 parts of potassium silicate alkali activator were mixed evenly to obtain solution 1. 40 parts of alkali-activated recycled brick powder and 60 parts of metakaolin were added to a mixing pot and thoroughly mixed to obtain powder 1. Powder 1 was then mixed with solution 1 and stirred continuously. First, the mixture was slowly stirred at 90 r / min for 60 seconds, paused for 15 seconds, and the slurry was scraped off the mixing pot wall. Then, it was rapidly stirred at 250 r / min for 60 seconds. After the rapid stirring, the stirring speed was maintained at 100 r / min for 30 seconds. This process was repeated until all components were uniformly mixed to obtain an alkali-activated recycled brick powder geopolymer slurry. The above slurry was poured into a 20mm×20mm×20mm mold, demolded after 24 hours, and cured under standard conditions for 28 days. Its compressive strength was tested to be 50.95MPa.

[0084] Substituting the mix proportion data into the strength calculation formula, where C is the 28-day compressive strength of the alkali-fused activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 This represents the total mass fractions of alkali-activated recycled brick powder, precursor materials, and alkali activator. When the precursor material is metakaolin, S1 = 1.12; when the flux is ammonium chloride, K1 = 1; when the alkali activator is potassium silicate, K2 = 0.2; thus, the following is obtained.

[0085]

[0086] It can be seen that the error between the strength calculation formula and the actual measured 28-day compressive strength is no more than 5%.

[0087] This invention discloses a mixing ratio design for an alkali-fused activated recycled brick powder geopolymer. Using alkali-fused activated recycled brick powder as raw material, the geopolymer is activated with an alkali activator, achieving a maximum 28-day strength of 101.24 MPa. The 28-day strength of traditional recycled brick powder geopolymers is 30 MPa, significantly lower than that of this invention. Furthermore, this invention is simple to operate, not only realizing the resource utilization of waste building brick powder but also successfully preparing a cementitious material with high strength properties. In addition, this invention provides a precise method for calculating the strength of alkali-fused activated recycled brick powder geopolymers. This calculation method exhibits extremely high prediction accuracy in practical applications, with an error of no more than 5% compared to the measured strength. This calculation method can effectively predict the strength development trend of alkali-fused activated recycled brick powder geopolymers, providing reliable technical support for practical engineering applications and possessing significant application value.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A alkali-fused activated recycled brick powder polymer, characterized in that, Includes the following components by weight: 20-30 parts water, 20-60 parts alkali-activated recycled brick powder, 40-80 parts precursor material, and 5-7 parts alkali activator; The alkali-fused activated recycled brick powder is prepared by the following steps: Step a1: Place the recycled brick powder in an oven to dry, and then grind the recycled brick powder until the particle size of the recycled brick powder meets the requirements; Step a2: Mix the ground recycled brick powder with the flux, stir until uniform, calcine, and cool naturally to obtain the alkali-activated recycled brick powder; In step a1, by mass, the flux is 3-5 parts, the recycled brick powder is 20-60 parts, the drying temperature in the oven is 60℃, the drying time is at least 24 hours, and the particle size requirement is no greater than 0.2mm. The flux is one of lithium metaborate, barium fluoride, and ammonium chloride, with a mass concentration of 20%-40%.

2. The alkali-fused activated recycled brick powder geopolymer according to claim 1, characterized in that, In step a2, during the calcination process, the furnace is placed in a muffle furnace and calcined at 200°C for 6 hours, with a heating rate of 20°C / min.

3. The alkali-fused activated recycled brick powder geopolymer according to claim 1, characterized in that, The silicon dioxide content in the recycled brick powder is not less than 45%.

4. The alkali-fused activated recycled brick powder geopolymer according to claim 1, characterized in that, The precursor material is one of marble sawdust, steel slag, or metakaolin, with a calcium content of not less than 40%.

5. The alkali-fused activated recycled brick powder polymer according to claim 1, characterized in that, The alkaline activator is one of potassium hydroxide, potassium silicate, and sodium metasilicate, with a mass concentration of 20%-40%.

6. A method for preparing an alkali-fused activated recycled brick powder geopolymer as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Mix water and alkaline activator evenly to obtain a mixed solution; Add the alkali-fused activated recycled brick powder and the precursor material to a mixing pot, and mix thoroughly to obtain a mixed powder. Step 2: Mix and stir the mixed powder with the mixed solution to finally obtain the alkali-activated recycled brick powder polymer.

7. The method for preparing alkali-fused activated recycled brick powder geopolymer according to claim 6, characterized in that, During the mixing and stirring process of the mixed powder and the mixed solution: Stir slowly for 60 seconds, pause for 15 seconds, scrape off the slurry from the sides of the mixing bowl, continue stirring quickly for 60 seconds, and finally stir slowly for 30 seconds. The stirring speeds for the slow stirring and fast stirring are 90-100 r / min and 250-260 r / min, respectively.

8. A method for calculating the strength of alkali-fused activated recycled brick powder geopolymer as described in any one of claims 1-5, characterized in that, The formula for strength calculation is as follows: In the formula: C is the 28-day compressive strength of the alkali-activated recycled brick powder polymer, m s m represents the mass fraction of the precursor material. f m represents the mass fraction of flux. a The mass fraction of the alkali activator is T, the calcination temperature is m. w ∑m represents the mass fraction of water. 固 S1 represents the total mass fraction of alkali-activated recycled brick powder, precursor materials, and alkali activator; S1, K1, and K2 are correction factors for precursor materials, flux, and alkali activator, respectively, and their values ​​depend on the specific types of precursor materials, flux, and alkali activator.

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