A high-temperature ultra-high-strength ceramic aggregate geopolymer mortar and its preparation method

Abstract

The present invention discloses a high-temperature ultra-high-strength ceramic aggregate geopolymer mortar and its preparation method, belonging to the field of building materials technology. The geopolymer mortar comprises the following raw materials, by weight: 193 parts metakaolin, 450 parts fly ash, 249 parts potassium water glass solution, 1280-1290 parts ceramic aggregate, and 86 parts water. This invention uses optimized graded ceramic waste as an alternative aggregate to natural sand, effectively treating ceramic waste while significantly enhancing the high-temperature mechanical properties of the geopolymer mortar.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a high-temperature ultra-high-strength ceramic aggregate geopolymer mortar and a preparation method thereof. Background Art

[0002] With my country's rapid economic development, a large amount of solid waste is generated annually, and the solution to this waste faces immense environmental pressure. Ceramic furniture is a popular material in my country, but when ceramics reach the end of their useful life, they lose their value and become pure waste. Besides outdated furniture products, ceramic waste also stems from poor workmanship and production errors. Ceramic waste accumulates daily, significantly impacting the ecological environment. While incineration and landfilling are common disposal methods, they also have significant negative impacts on the environment. Therefore, the proper disposal of solid waste has become a key research issue. Furthermore, the excessive and uncontrolled use of natural sand in the construction industry has raised serious concerns about the balance of natural resources and aquatic ecosystems. The dramatic decline in natural aggregate deposits poses significant environmental risks. Natural resource shortages and the accumulation of large, difficult-to-degrade solid waste are both significant and degradable. Therefore, using these solid wastes as alternative aggregates to natural sand in concrete has become an effective solution to alleviate resource shortages and eliminate solid waste.

[0003] Fire is one of the most serious dangers a building or structure may face. According to statistics from the China Fire Department, a total of 878,000 fires were reported nationwide in 2023, of which building fires accounted for over 40%. With the continuous growth of urban populations and the construction of high-rise buildings and industrial structures, the frequency of building fires is increasing. At high temperatures, the elastic modulus and strength of ordinary concrete will decrease significantly with increasing temperature, and it will crack and spall as the temperature rises. In severe cases, it may even explode. Concrete structures often suffer severe structural damage and even the continuous collapse of buildings due to the reduction in bearing capacity and stiffness after high temperatures, posing a serious threat to property and life. For these reasons, the poor high-temperature resistance of traditional concrete materials makes the research of new building refractory materials particularly important.

[0004] As a new green and low-carbon building material, geopolymer is an inorganic cementitious material with an amorphous three-dimensional network structure formed by the reaction of aluminosilicate materials and alkaline activators. Its preparation process produces low CO2 emissions. Geopolymer exhibits ceramic-like properties at high temperatures, undergoing viscous sintering and exhibiting excellent thermal stability and high-temperature resistance. This makes it less susceptible to flaking in fires and produces no toxic fumes, resulting in improved high-temperature resistance. Thermal incompatibility between aggregate and mortar is a major factor affecting the high-temperature resistance of geopolymer mortar. Standard sand expands rapidly at high temperatures, and this significant thermal incompatibility leads to increased cracking within the matrix. Waste ceramics offer high strength, wear resistance, heat resistance, and a low coefficient of thermal expansion. Using waste ceramics as a natural sand substitute in geopolymer mortar not only effectively manages this solid waste but also improves its high-temperature resistance. Currently, research on the performance of geopolymer mortar under high-temperature conditions has primarily focused on the impact of different aggregate types on thermal incompatibility. These studies primarily aim to mitigate thermal incompatibility issues by selecting different aggregates to improve the overall high-temperature resistance of geopolymer mortars. Existing studies have used fixed-size or partially continuously graded ceramic waste to quantitatively replace fully graded natural fine aggregate. However, this substitution approach results in discontinuous gradation of the replaced aggregate, uneven pore size distribution within the concrete, and degraded mechanical properties. This can severely impact the mortar's mechanical and heat resistance, particularly under high-temperature conditions.

[0005] As one of the world's largest solid wastes, the treatment of ceramic waste consumes a large amount of economic and resource resources, while also causing serious harm to the ecological environment. Using waste ceramics as a substitute for natural sand in geopolymer mortar can not only effectively treat these solid wastes, but also improve high-temperature resistance. However, in existing research on the high-temperature resistance of geopolymer mortar, when using solid waste to replace natural aggregates, fixed particle size or partially continuous grading is often used, and there is a lack of research on the grading of different aggregate particle sizes. Therefore, using optimized graded ceramic waste to prepare geopolymer mortar can not only contribute to the recycling of ceramic waste, but also further improve the high-temperature resistance of geopolymer mortar. Summary of the Invention

[0006] In response to the technical problems existing in the prior art, the purpose of the present invention is to propose a ceramic aggregate geopolymer mortar with ultra-high strength after high temperature and a preparation method thereof. The use of optimized graded ceramic waste as an alternative aggregate to natural sand can not only serve as one of the effective ways to treat ceramic waste, but also greatly enhance the mechanical properties of the geopolymer mortar after high temperature.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] The invention provides a ceramic aggregate geopolymer mortar with ultra-high strength after high temperature. The geopolymer mortar comprises the following raw materials in parts by weight: 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1280-1290 parts of ceramic aggregate and 86 parts of water.

[0009] Preferably, the geopolymer mortar comprises the following raw materials in parts by weight: 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1285 parts of ceramic aggregate and 86 parts of water.

[0010] Preferably, the ceramic aggregate comprises, by weight, the following raw materials with different particle size ranges: 128 parts of ceramic aggregate with a particle size of 2.36-1.18 mm, 257 parts of ceramic aggregate with a particle size of 1.18-0.6 mm, 385 parts of ceramic aggregate with a particle size of 0.6-0.18 mm, and 514 parts of ceramic aggregate with a particle size of 0.18-0.08 mm. The fineness modulus of the ceramic aggregate is precisely 1.55, which is crucial for the density and mechanical properties of the mortar and helps improve the overall high-temperature strength and stability of the material.

[0011] Preferably, the modulus of the potassium water glass solution is 1.0. The specific modulus of the potassium water glass solution (1.0) and the carefully designed mixing process ensure that the mortar has good fluidity and workability, facilitates construction, and ensures the consistency and stability of the material.

[0012] The present invention also provides a method for preparing ultra-high strength ceramic aggregate geopolymer mortar after high temperature, comprising the following steps:

[0013] (1) First, the ceramic waste is preliminarily crushed and cleaned, and then crushed again after drying, and sieved according to different particle size ranges. The crushed ceramic fine aggregate is classified and placed for standby use;

[0014] (2) weighing precursor materials of metakaolin and fly ash, potassium water glass solution, ceramic aggregates of different particle sizes, and water according to the mix ratio and setting aside;

[0015] (3) Adding metakaolin and fly ash together into a stirring pot, stirring at a low speed, and after the powders are evenly mixed, slowly adding potassium silicate solution, adjusting the stirring speed of the stirrer to medium, slowly adding mixing water in several times, and adjusting the stirring speed to high speed to obtain a mixture;

[0016] (4) Ceramic aggregates in different particle size ranges are slowly added to the mixture in step (3) in sequence, and stirring is continued at a high speed to obtain ultra-high strength ceramic aggregate geopolymer mortar after high temperature.

[0017] Preferably, in step (3), the rotation speed of the low-speed stirring is 100-110 r / min, and the stirring time is 1-2 min.

[0018] Preferably, in step (3), the rotation speed of the medium-speed stirring is 180-190 r / min, and the stirring time is 0.5-1 min.

[0019] Preferably, in step (3), the rotation speed of high-speed stirring is 400-410 r / min, and the stirring time is 3-5 min.

[0020] Preferably, in step (4), the rotation speed of high-speed stirring is 400-410 r / min, and the stirring time is 1-2 min.

[0021] Compared with the prior art, the technical solution provided by the present invention has the following advantages and beneficial effects:

[0022] (1) By optimizing the raw material ratio, especially the graded use of ceramic aggregates and the control of the fineness modulus, the present invention enables the prepared geopolymer mortar to maintain extremely high strength and excellent high-temperature resistance after high-temperature treatment. The compressive strength can reach above 50 MPa at room temperature, and after high temperature treatment of 1000°C, the compressive strength reaches a maximum of 115.2 MPa, with a strength retention rate of 229%, which is 394% and 89% higher than that of comparative examples 2 and 3 with unoptimized gradation design, respectively. Compared with geopolymer mortars prepared using standard sand or geopolymer mortars with ceramic aggregates without optimized gradation design, the compressive strength of the geopolymer mortar after high temperature treatment is greatly improved, and its excellent high-temperature resistance makes it suitable for more application scenarios.

[0023] (2) The present invention utilizes ceramic aggregate instead of natural sand as the aggregate for geopolymer mortar, which not only effectively treats waste ceramics but also achieves environmental protection and resource recycling. Furthermore, by optimizing the gradation design of the ceramic aggregate, the high-temperature resistance of the geopolymer mortar can be significantly improved, resulting in ultra-high compressive strength after high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the particle size distribution diagram of the comparative example and embodiment of the present invention.

[0025] Figure 2 This is a comparison chart of the compressive strength of the comparative example and the embodiment of the present invention at room temperature and after 1000°C.

[0026] Figure 3 This is a comparison chart of the compressive strength of the comparative example and the embodiment of the present invention after high temperature exposure at different temperatures. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, these examples are not to be construed as limiting the present invention and are merely examples.

[0028] Unless otherwise specified, the experimental methods or test methods described in the following examples are all conventional methods; the reagents and materials described are all obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0029] Example 1

[0030] In this example, ceramic aggregate is selected as the aggregate in the geopolymer mortar, and a gradation design with a fineness modulus of 1.55 is adopted.

[0031] The raw material components and contents of the geopolymer mortar, calculated by weight, are: 193 parts metakaolin, 450 parts fly ash, 249 parts potassium water glass solution, 1,285 parts ceramic aggregate (including 128 parts of 2.36-1.18 mm ceramic aggregate, 257 parts of 1.18-0.6 mm ceramic aggregate, 385 parts of 0.6-0.18 mm ceramic aggregate, and 514 parts of 0.18-0.08 mm ceramic aggregate), and 86 parts of water. The modulus of the potassium water glass solution is 1.0.

[0032] The preparation method of the high temperature resistant geopolymer mortar is:

[0033] (1) First, the ceramic waste is preliminarily crushed and cleaned, and then crushed again after drying. It is sieved according to different particle size ranges, and the crushed ceramic fine aggregate is classified and placed for standby use.

[0034] (2) Weigh the precursor materials (metakaolin and fly ash), potassium water glass solution, ceramic aggregates of different particle size ranges and water according to the mixing ratio and set aside.

[0035] (3) Add metakaolin and fly ash into a stirring pot together, stir at a low speed of 108 r / min for 1-2 minutes, and after the powders are evenly mixed, slowly add potassium water glass solution, adjust the stirrer to a medium speed of 188 r / min and stir for 0.5 minutes, then slowly add mixing water in several times, adjust the stirrer to a high speed of 403 r / min and stir for 3-5 minutes to obtain a mixture.

[0036] (4) Ceramic aggregates in different particle size ranges are slowly added to the mixture in step (3) in sequence, and the mixture is stirred at a high speed of 403 r / min for 1-2 minutes to obtain a high-temperature ultra-high strength ceramic aggregate geopolymer mortar.

[0037] The fresh geopolymer mortar prepared above was poured into a 40*40*40 mm cubic mold, sealed and cured at room temperature for 1 day, then demoulded and placed in a standard curing room (temperature 20±2°C, humidity ≥95%) for up to 28 days.

[0038] The high-temperature exposure test was conducted using a Beike MF-1200C box furnace with five target temperatures: 200°C, 400°C, 600°C, 800°C, and 1000°C. 28-day-old specimens were placed in the muffle furnace and heated to the target temperature at a rate of 10°C / min. After holding at the target temperature for 1 hour, the power was turned off. After the specimens and furnace cooled to room temperature, they were removed and subjected to compressive strength testing.

[0039] The compressive strength test results of the geopolymer mortar are as follows: 50.3 MPa at room temperature after 28 days; 65.2 MPa after being heated to 200°C; 76.2 MPa after being heated to 400°C; 76.4 MPa after being heated to 600°C; 84.9 MPa after being heated to 800°C; and 115.2 MPa after being heated to 1000°C.

[0040] Comparative Example 1

[0041] The fine aggregate in this comparative example is Chinese ISO standard sand, and the particle size gradation complies with the national standard "Construction Sand" (GB / T14684-2022).

[0042] The raw material components and contents of the geopolymer mortar are as follows: 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1285 parts of Chinese ISO standard sand and 86 parts of water, calculated by weight.

[0043] The preparation method of the geopolymer mortar is:

[0044] (1) Weigh the precursor materials (metakaolin and fly ash), potassium water glass solution, Chinese ISO standard sand and water according to the mixing ratio and set aside.

[0045] (2) Add metakaolin and fly ash into a stirring pot together, stir at a low speed of 108 r / min for 1-2 minutes, and after the powders are evenly mixed, slowly add potassium water glass solution, adjust the stirrer to a medium speed of 188 r / min and stir for 0.5 minutes, then slowly add mixing water in several times, adjust the stirrer to a high speed of 403 r / min and stir for 3-5 minutes to obtain a mixture.

[0046] (3) Slowly add Chinese ISO standard sand to the mixture in step (3), and continue stirring at a high speed of 403 r / min for 1-2 minutes to obtain ordinary geopolymer mortar.

[0047] The fresh geopolymer mortar prepared above was poured into a 40*40*40 mm cubic mold, sealed and cured at room temperature for 1 day, then demoulded and placed in a standard curing room (temperature 20±2°C, humidity ≥95%) for up to 28 days.

[0048] The high-temperature exposure test was conducted using a Beike MF-1200C box furnace with five target temperatures: 200°C, 400°C, 600°C, 800°C, and 1000°C. 28-day-old specimens were placed in the muffle furnace and heated to the target temperature at a rate of 10°C / min. After holding at the target temperature for 1 hour, the power was turned off. After the specimens and furnace cooled to room temperature, they were removed and subjected to compressive strength testing.

[0049] The compressive strength test performance of the geopolymer mortar is as follows: the compressive strength of the prepared geopolymer mortar at room temperature for 28 days is 46.3 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 200°C is 60.1 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 400°C is 63.1 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 600°C is 52.8 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 800°C is 44.7 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 1000°C is 20.0 MPa.

[0050] Comparative Example 2

[0051] In this example, ceramic aggregate is selected as the aggregate in the geopolymer mortar, and a gradation design with a fineness modulus of 3.98 is adopted.

[0052] The raw material components and contents of the geopolymer mortar are, in parts by mass, 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1285 parts of ceramic aggregate (including 514 parts of 4.75-2.36 mm ceramic aggregate, 385 parts of 2.36-1.18 mm ceramic aggregate, 257 parts of 1.18-0.6 mm ceramic aggregate and 128 parts of 0.6-0.18 mm ceramic aggregate) and 86 parts of water.

[0053] The preparation method of the geopolymer mortar is:

[0054] (1) First, the ceramic waste is preliminarily crushed and cleaned, and then crushed again after drying. It is sieved according to different particle size ranges, and the crushed ceramic fine aggregate is classified and placed for standby use.

[0055] (2) Weigh the precursor materials (metakaolin and fly ash), potassium water glass solution, ceramic aggregates of different particle size ranges and water according to the mixing ratio and set aside.

[0056] (3) Add metakaolin and fly ash into a stirring pot together, stir at a low speed of 108 r / min for 1-2 minutes, and after the powders are evenly mixed, slowly add potassium water glass solution, adjust the stirrer to a medium speed of 188 r / min and stir for 0.5 minutes, then slowly add mixing water in several times, adjust the stirrer to a high speed of 403 r / min and stir for 3-5 minutes to obtain a mixture.

[0057] (4) Ceramic aggregates in different particle size ranges are slowly added to the mixture in step (3) in sequence, and stirred at a high speed of 403 r / min for 1-2 min to obtain a common ceramic aggregate geopolymer mortar.

[0058] The fresh geopolymer mortar prepared above was poured into a 40*40*40 mm cubic mold, sealed and cured at room temperature for 1 day, then demoulded and placed in a standard curing room (temperature 20±2°C, humidity ≥95%) for up to 28 days.

[0059] The high-temperature exposure test was conducted using a Beike MF-1200C box furnace with five target temperatures: 200°C, 400°C, 600°C, 800°C, and 1000°C. 28-day-old specimens were placed in the muffle furnace and heated to the target temperature at a rate of 10°C / min. After holding at the target temperature for 1 hour, the power was turned off. After the specimens and furnace cooled to room temperature, they were removed and subjected to compressive strength testing.

[0060] The compressive strength test performance of the geopolymer mortar is as follows: the compressive strength of the prepared geopolymer mortar at room temperature for 28 days is 54.0 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 200°C is 58.0 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 400°C is 55.6 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 600°C is 51.6 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 800°C is 41.5 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 1000°C is 23.3 MPa.

[0061] Comparative Example 3

[0062] In this example, ceramic aggregate is used as the aggregate in the geopolymer mortar, and a gradation design with a fineness modulus of 2.55 is adopted.

[0063] The raw material components and contents of the geopolymer mortar, calculated by mass, are: 193 parts metakaolin, 450 parts fly ash, 249 parts potassium water glass solution, 1,285 parts ceramic aggregate (including 321 parts of 2.36-1.18 mm ceramic aggregate, 450 parts of 1.18-0.6 mm ceramic aggregate, 385 parts of 0.6-0.18 mm ceramic aggregate, and 128 parts of 0.18-0.08 mm ceramic aggregate), and 86 parts of water. The modulus of the potassium water glass solution is 1.0.

[0064] The preparation method of the geopolymer mortar is:

[0065] (1) First, the ceramic waste is preliminarily crushed and cleaned, and then crushed again after drying. It is sieved according to different particle size ranges, and the crushed ceramic fine aggregate is classified and placed for standby use.

[0066] (2) Weigh the precursor materials (metakaolin and fly ash), potassium water glass solution, ceramic aggregates of different particle size ranges and water according to the mixing ratio and set aside.

[0067] (3) Add metakaolin and fly ash into a stirring pot together, stir at a low speed of 108 r / min for 1-2 minutes, and after the powders are evenly mixed, slowly add potassium water glass solution, adjust the stirrer to a medium speed of 188 r / min and stir for 0.5 minutes, then slowly add mixing water in several times, adjust the stirrer to a high speed of 403 r / min and stir for 3-5 minutes to obtain a mixture.

[0068] (4) Ceramic aggregates in different particle size ranges are slowly added to the mixture in step (3) in sequence, and stirred at a high speed of 403 r / min for 1-2 min to obtain a common ceramic aggregate geopolymer mortar.

[0069] The fresh geopolymer mortar prepared above was poured into a 40*40*40 mm cubic mold, sealed and cured at room temperature for 1 day, then demoulded and placed in a standard curing room (temperature 20±2°C, humidity ≥95%) for up to 28 days.

[0070] The high-temperature exposure test was conducted using a Beike MF-1200C box furnace with five target temperatures: 200°C, 400°C, 600°C, 800°C, and 1000°C. 28-day-old specimens were placed in the muffle furnace and heated to the target temperature at a rate of 10°C / min. After holding at the target temperature for 1 hour, the power was turned off. After the specimens and furnace cooled to room temperature, they were removed and subjected to compressive strength testing.

[0071] The compressive strength test performance of the geopolymer mortar is as follows: the compressive strength of the prepared geopolymer mortar at room temperature for 28 days is 52.8 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 200°C is 63.0 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 400°C is 71.1 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 600°C is 70.5 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 800°C is 64.5 MPa; the compressive strength of the prepared geopolymer mortar after high temperature of 1000°C is 60.9 MPa.

[0072] The present invention takes Example 1 as an example and describes the gradation design features of ceramic aggregate in combination with Comparative Examples 1, 2 and 3:

[0073] from Figure 1It can be seen that the volume proportions of small-size aggregate and large-size aggregate are increased in the gradation design of Example 1 and Comparative Example 2, respectively. The gradation design of Comparative Example 3 is consistent with the particle size gradation of ISO standard sand in Comparative Example 1.

[0074] from Figure 2 It can be seen that the use of ceramic aggregate instead of ISO standard sand will increase the room temperature compressive strength of geopolymer mortar, but ceramic aggregates with different gradation designs have little effect on the room temperature compressive strength. It can be seen from Comparative Example 3 and Comparative Example 1 that, under the same gradation design, the use of ceramic aggregate instead of standard sand will increase the compressive strength of geopolymer mortar after 1000°C. It can be seen from Example 1, Comparative Example 2 and Comparative Example 3 that the use of optimized gradation design significantly improves the compressive strength of geopolymer mortar after 1000°C. In particular, Example 1 adopts a gradation design of small-particle aggregate. The compressive strength of Example 1 after 1000°C is 115.2MPa, which is 394% and 89% higher than that of Comparative Example 2 and Comparative Example 3, respectively, and 476% higher than that of Comparative Example 1.

[0075] from Figure 3 Comparative Example 1 is a geopolymer mortar prepared using ISO standard sand. Comparative Example 2 is a ceramic aggregate geopolymer mortar with a fineness modulus of 3.98. Comparative Example 3 is a ceramic aggregate geopolymer mortar with a fineness modulus of 2.55. Example 1 is a ceramic aggregate geopolymer mortar with a fineness modulus of 1.55. Using ceramic aggregate instead of ISO standard sand improves the compressive strength of the geopolymer mortar across all temperature ranges. With an optimized gradation design, the compressive strength of the geopolymer mortar continues to increase with increasing temperature, and exhibits ultra-high strength after exposure to a high temperature of 1000°C.

[0076] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature ultra-high strength ceramic aggregate geopolymer mortar, characterized in that: The geopolymer mortar comprises the following raw materials in parts by weight: 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1280-1290 parts of ceramic aggregate and 86 parts of water; The ceramic aggregate includes the following raw materials in different particle size ranges in terms of weight: 128 parts of ceramic aggregate with a particle size of 2.36-1.18 mm, 257 parts of ceramic aggregate with a particle size of 1.18-0.6 mm, 385 parts of ceramic aggregate with a particle size of 0.6-0.18 mm, and 514 parts of ceramic aggregate with a particle size of 0.18-0.08 mm.

2. The high-temperature ultra-high strength ceramic aggregate geopolymer mortar according to claim 1, characterized in that: The geopolymer mortar comprises the following raw materials in parts by weight: 193 parts of metakaolin, 450 parts of fly ash, 249 parts of potassium water glass solution, 1285 parts of ceramic aggregate and 86 parts of water.

3. The high-temperature ultra-high strength ceramic aggregate geopolymer mortar according to claim 1, characterized in that: The modulus of the potassium water glass solution is 1.

0.

4. A method for preparing the high-temperature ultra-high strength ceramic aggregate geopolymer mortar according to any one of claims 1 to 3, characterized in that: The steps include: (1) First, the ceramic waste is preliminarily crushed and cleaned, and then crushed again after drying. It is sieved according to different particle size ranges, and the crushed ceramic fine aggregate is classified and placed for standby use; (2) Weigh the precursor materials of metakaolin and fly ash, potassium water glass solution, ceramic aggregates of different particle sizes and water according to the mix ratio and set aside; (3) Add the metakaolin and fly ash into a mixing pot and stir at a low speed. After the powders are evenly mixed, slowly add the potassium water glass solution. After the mixer is adjusted to a medium speed, slowly add the mixing water in several times and adjust the mixer to a high speed to obtain a mixture. (4) Ceramic aggregates in different particle size ranges are slowly added to the mixture in step (3) in sequence, and stirring is continued at a high speed to obtain ultra-high strength ceramic aggregate geopolymer mortar after high temperature.

5. The method for preparing ultra-high strength ceramic aggregate geopolymer mortar after high temperature according to claim 4, characterized in that: In step (3), the rotation speed of low-speed stirring is 100-110 r / min, and the stirring time is 1-2 min.

6. The method for preparing ultra-high strength ceramic aggregate geopolymer mortar after high temperature according to claim 4, characterized in that: In step (3), the speed of medium-speed stirring is 180-190 r / min, and the stirring time is 0.5-1 min.

7. The method for preparing ultra-high strength ceramic aggregate geopolymer mortar after high temperature according to claim 4, characterized in that: In step (3), the rotation speed of high-speed stirring is 400-410 r / min, and the stirring time is 3-5 min.

8. The method for preparing ultra-high strength ceramic aggregate geopolymer mortar after high temperature according to claim 4, characterized in that: In step (4), the rotation speed of high-speed stirring is 400-410 r / min, and the stirring time is 1-2 min.

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