A mortar based on solid waste-based material and a method for preparing the same

Abstract

The application discloses a kind of mortar based on solid waste base material and preparation method thereof, belong to building material technical field.The mortar includes cement 315~360 parts by weight, metakaolin 13.5~22.5 parts, waste clay brick powder 45~58.5 parts, limestone powder 13.5~27 parts, carbide slag 9~13.5 parts, quicklime 9~13.5 parts, standard sand 1350 parts, water 225 parts, nano C-S-H seed crystal 5.4~10.8 parts and alkanolamine 0.09~0.225 parts.The preparation of nano C-S-H in the application uses bagasse ash and carbide slag, realizes resource utilization;The solid waste base material particles used not only fill each other, but also produce chemical synergies to promote the formation of more hydration products, improve the performance of mortar;The selected additive has synergistic effect in promoting hydration, further improves the performance of mortar;Preparation process uses a variety of solid waste base materials, improves resource utilization rate.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a mortar based on solid waste materials and its preparation method. Background Technology

[0002] Currently, my country generates over 4 billion tons of solid waste annually. If not treated promptly, the large quantities of stored solid waste not only occupy vast amounts of land but also cause severe environmental pollution. Research has found that the oxide composition of some solid wastes (such as bagasse ash, carbide slag, and waste clay brick powder) is similar to that of silicate cement, primarily composed of CaO, SiO2, Al2O3, and Fe2O3, demonstrating their potential as cement substitutes. Using these solid wastes as auxiliary cementitious materials in the preparation of mortar and concrete products can fundamentally reduce cement usage, thereby lowering carbon emissions from the cement industry, while also improving the utilization rate of solid waste and mitigating its adverse impacts on the ecological environment.

[0003] Low early-stage activity has been a major factor limiting the large-scale application of cement substitutes. For mortar, this is primarily reflected in the lower early-stage compressive strength of blended cement mortar compared to pure silicate cement mortar. This problem can be effectively solved by rationally optimizing the mix proportions or selecting suitable chemical admixtures based on the composition of the cementitious materials. Since mortar is prepared from a mixture of multiple components, changes in the characteristics of each component can significantly affect its performance. In conclusion, employing appropriate cementitious material composition coupled with effective activity activation methods is of significant practical importance for preparing low-carbon, high-compressive-strength mortar. Summary of the Invention

[0004] In order to fundamentally reduce the pollution of the ecological environment caused by solid waste accumulation, reduce carbon emissions from the cement industry, and lower the manufacturing cost of high-performance mortar, this invention provides a mortar based on solid waste-based materials and its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A mortar based on solid waste materials, comprising the following components in parts by weight:

[0007] 315-360 parts cement;

[0008] Parts 13.5–22.5 of metakaolin;

[0009] 45-58.5 parts of waste clay brick powder;

[0010] Limestone powder 13.5–27 parts;

[0011] 9-13.5 parts of calcium carbide slag;

[0012] 9-13.5 parts quicklime;

[0013] 1350 samples of standard sand;

[0014] 225 parts water;

[0015] Nano-CSH seed crystals: 5.4–10.8 parts;

[0016] Alkaneolamines: 0.09–0.225 parts.

[0017] Further, the preparation of the nano-CSH seed crystals is as follows: Sodium silicate solution is obtained by treating bagasse ash with NaOH solution, where the Na / Si molar ratio is 2:1 and the material-to-liquid ratio is 16%; calcium nitrate solution is obtained by treating carbide slag with HNO3 solution, where the Ca / NO3 molar ratio is 1:2 and the material-to-liquid ratio is 22%; and nano-CSH seed crystals are synthesized by co-precipitation at 20–25°C, using sodium silicate solution as the silicon source, calcium nitrate solution as the calcium source, and polycarboxylate superplasticizer as the dispersing stabilizer.

[0018] Furthermore, the calcium carbide slag has a Ca(OH)2 content >80% and a particle size of 5-20 μm.

[0019] Furthermore, the concentrations of both the NaOH solution and the HNO3 solution are 60%; the bagasse ash has a SiO2 content >75% and a specific surface area of ​​525 m². 2 / kg; the solid content of the polycarboxylate superplasticizer is 19.8%, and the water reduction rate is >35%; nano CSH seed crystals are prepared by using 103g sodium silicate solution as silicon source, 110g calcium nitrate solution as calcium source, and 92g polycarboxylate superplasticizer as dispersant and stabilizer, and the mass fraction of polycarboxylate superplasticizer is 7.8%.

[0020] Furthermore, a peristaltic pump was used to add sodium silicate solution and calcium nitrate solution dropwise to the polycarboxylate superplasticizer, and the addition was completed within 30 minutes. During this period, the pH of the solution was controlled at 11.7±0.1, the stirring speed was 280-300 rpm, and the solution was aged for more than 3 hours after the addition was completed.

[0021] Furthermore, the cement is ordinary Portland cement with a specific surface area of ​​355 m². 2 / kg, of which C3S content is 59.38%, C3A content is 7.28%, and C4AF content is 11.64%.

[0022] Furthermore, the metakaolin has a fineness of passing through a 1250-mesh sieve, and its Al2O3 content is 43.44% and SiO2 content is 54.55%.

[0023] The waste clay brick powder has a fineness of passing through a 200-mesh sieve, and contains 12.89% Al2O3, 60.28% SiO2, 14.03% CaO, and 5.47% Fe2O3.

[0024] The limestone powder has a particle size of less than 100 μm, and contains 85% calcite and 15% dolomite.

[0025] The quicklime has a purity >95% and a specific surface area of ​​396 m². 2 / kg.

[0026] Furthermore, the average particle size of the nano-CSH seeds is approximately 152 nm, and the solid content is 19.26%.

[0027] Furthermore, the alkanolamine is diethanol monoisopropanolamine, and the effective content of the alkanolamine is >85%.

[0028] A method for preparing mortar based on solid waste materials includes the following steps:

[0029] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime of each mass and mix them evenly to obtain the cementitious material.

[0030] S2. Weigh out the nano-CSH seed crystals, alkanolamine, water, and standard sand by weight, and then mix them evenly with the cementitious material to obtain the mortar.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The nano CSH seed crystals used in this invention are prepared by co-precipitation after solid waste pretreatment, which not only ensures the purity of the CSH seed crystals, but also realizes the resource utilization of solid waste.

[0033] 2. The metakaolin and waste clay brick powder used in this invention contain a relatively high amount of Al2O3, which can chemically synergistically interact with limestone powder to promote the formation of hydration products, thus facilitating a higher cement replacement rate. Furthermore, metakaolin exhibits higher early-age activity compared to waste clay brick powder, compensating for some of the early strength loss caused by the dilution effect. A highly alkaline environment is beneficial for activating the early-age activity of both metakaolin and waste clay brick powder. The use of carbide slag and quicklime to increase the alkalinity of the mixed cement paste further enhances the early hydration degree; the exothermic dissolution of quicklime also increases the hydration reaction rate. The different particle size distributions of the various cementitious materials allow for mutual filling, promoting the formation of a dense microstructure.

[0034] 3. This invention, by simultaneously adding CSH seed crystals and alkanolamines, significantly enhances the hydration level of the cementitious system. The main function of CSH seed crystals in the cementitious system is to promote the hydration of silicate minerals and the pozzolanic reaction of auxiliary cementitious materials. In addition to promoting cement hydration and the pozzolanic reaction of auxiliary cementitious materials, alkanolamines can also promote the reaction between the aluminum phase in cement, metakaolin, and waste clay brick powder and limestone, thus promoting the formation of more hydration products.

[0035] 4. This invention uses a variety of solid wastes as raw materials. On the one hand, it improves the utilization rate of solid waste and reduces its pollution to the ecological environment; on the other hand, it reduces the amount of cement used without affecting the performance of the mortar, thereby reducing carbon emissions at the source and lowering the manufacturing cost of the mortar. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] In this embodiment of the invention, the preparation of nano-CSH seeds is as follows: Sodium silicate solution is obtained by treating bagasse ash with NaOH solution, with a Na / Si molar ratio of 2:1 and a material-to-liquid ratio of 16%; calcium nitrate solution is obtained by treating carbide slag with HNO3 solution, with a Ca / NO3 molar ratio of 1:2 and a material-to-liquid ratio of 22%; nano-CSH seeds are synthesized by co-precipitation at 20–25°C using 103g sodium silicate solution as the silicon source, 110g calcium nitrate solution as the calcium source, and 92g polycarboxylate superplasticizer as the dispersant and stabilizer; wherein the concentrations of both NaOH and HNO3 solutions are 60%; the SiO2 content of the bagasse ash is >75%, and the specific surface area is 525 m². 2 / kg; the solid content of the polycarboxylate superplasticizer is 19.8%, and the water reduction rate is >35%. In the synthesis experiment, it was prepared as a solution with a mass fraction of 7.8% for use.

[0038] In this embodiment of the invention, the carbide slag used to prepare the mortar and the carbide slag used to prepare the nano CSH seed crystals are the same carbide slag, with a Ca(OH)2 content >80% and a particle size of 5-20 μm.

[0039] In this embodiment of the invention, a peristaltic pump is used to drop sodium silicate solution and calcium nitrate solution into polycarboxylate superplasticizer. The droplet addition is completed within 30 minutes. During this period, the pH of the solution is controlled at 11.7±0.1, the stirring rate is 280-300 rpm, and the solution is aged for more than 3 hours after the droplet addition is completed.

[0040] In this embodiment of the invention, the cement is ordinary Portland cement with a specific surface area of ​​355 m². 2 / kg, of which C3S content is 59.38%, C3A content is 7.28%, and C4AF content is 11.64%.

[0041] In this embodiment of the invention, the metakaolin has a fineness of passing through a 1250-mesh sieve, with an Al2O3 content of 43.44% and a SiO2 content of 54.55%; the waste clay brick powder has a fineness of passing through a 200-mesh sieve, with an Al2O3 content of 12.89%, a SiO2 content of 60.28%, a CaO content of 14.03%, and a Fe2O3 content of 5.47%; the limestone powder has a particle size of less than 100 μm, with a calcite content of 85% and a dolomite content of 15%; the quicklime has a purity >95% and a specific surface area of ​​396 m². 2 / kg.

[0042] In this embodiment of the invention, the average particle size of the nano-CSH seeds is about 152 nm, and the solid content is 19.26%.

[0043] In this embodiment of the invention, the alkanolamine is diethanol monoisopropanolamine, and the effective content of the alkanolamine is >85%.

[0044] Example 1

[0045] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 1.

[0046] Table 1

[0047] raw material Weight / serving cement 315 metakaolin 22.5 Waste clay brick powder 58.5 limestone powder 27 calcium carbide slag 13.5 quicklime 13.5 Standard sand 1350 water 225 Nano CSH Seeds 5.4 Diethanolmonoisopropanolamine 0.09

[0048] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0049] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 1 and mix them evenly to obtain the cementitious material.

[0050] S2. Weigh out the nano CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 1, and then mix them evenly with the cementitious material to obtain mortar.

[0051] Example 2

[0052] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 2.

[0053] Table 2

[0054] raw material Weight / serving cement 360 metakaolin 13.5 Waste clay brick powder 45 limestone powder 13.5 calcium carbide slag 9 quicklime 9 Standard sand 1350 water 225 Nano CSH Seeds 5.4 Diethanolmonoisopropanolamine 0.09

[0055] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0056] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 2 and mix them evenly to obtain the cementitious material.

[0057] S2. Weigh out the nano CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 2, and then mix them evenly with the cementitious material to obtain mortar.

[0058] Example 3

[0059] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 3.

[0060] Table 3

[0061]

[0062]

[0063] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0064] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 3 and mix them evenly to obtain the cementitious material.

[0065] S2. Weigh out the nano-CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 3, and then mix them evenly with the cementitious material to obtain mortar.

[0066] Example 4

[0067] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 4.

[0068] Table 4

[0069]

[0070]

[0071] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0072] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 4 and mix them evenly to obtain the cementitious material.

[0073] S2. Weigh out the nano-CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 4, and then mix them evenly with the cementitious material to obtain mortar.

[0074] Example 5

[0075] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 5.

[0076] Table 5

[0077] raw material Weight / serving cement 315 metakaolin 22.5 Waste clay brick powder 58.5 limestone powder 27 calcium carbide slag 13.5 quicklime 13.5 Standard sand 1350 water 225 Nano CSH Seeds 10.8 Diethanolmonoisopropanolamine 0.09

[0078] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0079] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 5 and mix them evenly to obtain the cementitious material.

[0080] S2. Weigh out the nano-CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 5, and then mix them evenly with the cementitious material to obtain mortar.

[0081] Example 6

[0082] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 6.

[0083] Table 6

[0084] raw material Weight / serving cement 360 metakaolin 13.5 Waste clay brick powder 45 limestone powder 13.5 calcium carbide slag 9 quicklime 9 Standard sand 1350 water 225 Nano CSH Seeds 5.4 Diethanolmonoisopropanolamine 0.225

[0085] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0086] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 6 and mix them evenly to obtain the cementitious material.

[0087] S2. Weigh out the nano-CSH seed crystals, diethanol monoisopropanolamine, water, and standard sand as shown in Table 6, and then mix them evenly with the cementitious material to obtain mortar.

[0088] Example 7

[0089] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 7.

[0090] Table 7

[0091] raw material Weight / serving cement 360 metakaolin 13.5 Waste clay brick powder 45 limestone powder 13.5 calcium carbide slag 9 quicklime 9 Standard sand 1350 water 225 Nano CSH Seeds 10.8 Diethanolmonoisopropanolamine 0.09

[0092] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0093] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 7 and mix them evenly to obtain the cementitious material.

[0094] S2. Weigh out the nano CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 7, and then mix them evenly with the cementitious material to obtain mortar.

[0095] Example 8

[0096] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 8.

[0097] Table 8

[0098]

[0099]

[0100] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0101] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 8 and mix them evenly to obtain the cementitious material.

[0102] S2. Weigh out the nano CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 8, and then mix them evenly with the cementitious material to obtain mortar.

[0103] Example 9

[0104] As a preferred embodiment of the present invention, this embodiment discloses a mortar based on solid waste materials, the specific composition of which is shown in Table 9.

[0105] Table 9

[0106]

[0107]

[0108] This embodiment describes a method for preparing mortar based on solid waste materials, including the following steps:

[0109] S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime as shown in Table 9 and mix them evenly to obtain the cementitious material.

[0110] S2. Weigh out the nano CSH seed crystals, diethanol monoisopropanolamine, water and standard sand as shown in Table 9, and then mix them evenly with the cementitious material to obtain mortar.

[0111] Comparative Example 1

[0112] The difference between this comparative example and Example 6 is that no nano-CSH seeds and diethanol monoisopropanolamine were added in this comparative example, while all other conditions were the same, resulting in a comparative mortar.

[0113] Comparative Example 2

[0114] The difference between this comparative example and Example 6 is that the cementing material in this comparative example is only ordinary silicate cement and no nano CSH seed crystals and diethanol monoisopropanolamine are added. All other conditions are the same, and a comparative mortar is obtained.

[0115] Comparative Example 3

[0116] The difference between this comparative example and Example 6 is that the cementing material in this comparative example is only ordinary silicate cement, while all other conditions are the same, resulting in a comparative mortar.

[0117] Comparative Example 4

[0118] The difference between this comparative example and Example 6 is that diethanol monoisopropanolamine is replaced with monoethanol diisopropanolamine in this comparative example, while all other conditions are the same, resulting in a comparative mortar.

[0119] Test case

[0120] The setting times of Examples 1 to 9 and Comparative Examples 1 to 4 were tested according to the national standard GB / T 1346-2011 Cement Standard Consistency Water Requirement, Setting Time and Soundness Test Method, and the test results are shown in Table 10. The compressive strength of each mortar at different ages was tested according to the national standard GB / T 17671-2021 Cement Mortar Strength Test Method (ISO Method), and the test results are shown in Table 11.

[0121] Table 10

[0122]

[0123]

[0124] As shown in Table 10, the initial setting time of the examples and comparative examples was 75–154 min, and the final setting time was 125–284 min, both meeting the requirements of the national standard GB175-2023 for cement setting time. Whether in a silicate cement system (i.e., where the cementitious material is only ordinary silicate cement) or in a mixed cement system with added solid waste, diethanol monoisopropanolamine / monoethanol diisopropanolamine and nano-CSH seed crystals significantly shortened the initial and final setting times. By comparing Examples 3, 8, and 9; Examples 1, 4, and 5; and Examples 2, 6, and 7, it can be found that the higher the amount of admixture (nano-CSH seed crystals / diethanol monoisopropanolamine), the more significant the accelerating effect. Furthermore, the accelerating effect of monoethanol diisopropanolamine is slightly weaker than that of diethanol monoisopropanolamine.

[0125] Table 11

[0126]

[0127]

[0128] As shown in Table 11, in the early stages (1 day and 3 days), the compressive strength of some mixed cement mortars (such as Examples 7 and 9) was higher than that of pure cement mortar (Comparative Example 2). This was mainly due to the promoting effect of diethanol monoisopropanolamine and nano-CSH seeds on the hydration of the cementitious materials. At 28 days, the compressive strength of all examples was much higher than that of pure cement mortar. By comparing Examples 3, 8, and 9, Examples 1, 4, and 5, and Examples 2, 6, and 7, it can be found that the higher the amount of admixture (nano-CSH seeds / diethanol monoisopropanolamine), the more significant the reinforcing effect. In addition, the results of Examples 6 and Comparative Example 4 show that the 1-day reinforcing effect of diethanol monoisopropanolamine is significantly weaker than that of diethanol monoisopropanolamine, the 3-day reinforcing effect is comparable, and the 28-day reinforcing effect is slightly stronger than that of diethanol monoisopropanolamine.

[0129] This invention produces a mortar based on solid waste materials by using a suitable cementitious material composition and effective activation methods. The mortar's setting time meets national standards and it possesses high early and late strength. Furthermore, the mortar's preparation utilizes various bulk solid wastes, contributing to the implementation of energy conservation and emission reduction strategies in the cement industry.

[0130] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit the invention, nor are they intended to limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. That is to say, any changes or refinements made to the main design concept and spirit of the present invention that are not of substantial significance, but whose technical problems are still consistent with the present invention, should be included within the protection scope of the present invention. In addition, the direct or indirect application of the technical solutions of the present invention to other related technical fields are similarly included within the patent protection scope of the present invention.

Claims

1. A mortar based on solid waste-based materials, characterized in that, The components include the following parts by weight: 315-360 parts cement; Metakaolin: 13.5–22.5 parts; 45-58.5 parts of waste clay brick powder; Limestone powder 13.5~27 parts; 9-13.5 parts of calcium carbide slag; 9-13.5 parts quicklime; 1350 samples of standard sand; 225 parts water; 5.4–10.8 parts of nano-CSH seed crystals; Alkaneolamines: 0.09~0.225 parts; The preparation of the nano-CSH seed crystals is as follows: Sodium silicate solution is obtained by treating bagasse ash with NaOH solution, with a Na / Si molar ratio of 2:1 and a material-to-liquid ratio of 16%; calcium nitrate solution is obtained by treating carbide slag with HNO3 solution, with a Ca / NO3 molar ratio of 1:2 and a material-to-liquid ratio of 22%; nano-CSH seed crystals are synthesized by co-precipitation at 20-25℃, using sodium silicate solution as the silicon source, calcium nitrate solution as the calcium source, and polycarboxylate superplasticizer as the dispersing stabilizer.

2. The mortar based on solid waste-based materials according to claim 1, characterized in that, The carbide slag has a Ca(OH)2 content >80% and a particle size of 5~20μm.

3. The mortar based on solid waste-based materials according to claim 1, characterized in that, The concentrations of both the NaOH solution and the HNO3 solution are 60%; the bagasse ash has a SiO2 content >75% and a specific surface area of ​​525 m². 2 / kg; the solid content of the polycarboxylate superplasticizer is 19.8%, and the water reduction rate is >35%; nano CSH seed crystals are prepared by using 103g sodium silicate solution as silicon source, 110g calcium nitrate solution as calcium source, and 92g polycarboxylate superplasticizer as dispersant and stabilizer, and the mass fraction of polycarboxylate superplasticizer is 7.8%.

4. The mortar based on solid waste-based materials according to claim 1, characterized in that, Sodium silicate solution and calcium nitrate solution were added dropwise to polycarboxylate superplasticizer using a peristaltic pump. The addition was completed within 30 minutes, during which the pH of the solution was controlled at 11.7±0.1 and the stirring speed was 280~300 rpm. After the addition was completed, the solution was aged for more than 3 hours.

5. The mortar based on solid waste-based materials according to claim 1, characterized in that, The cement is ordinary Portland cement with a specific surface area of ​​355 m². 2 / kg, of which C3S content is 59.38%, C3A content is 7.28%, and C4AF content is 11.64%.

6. The mortar based on solid waste-based materials according to claim 1, characterized in that, The metakaolin has a fineness of passing through a 1250-mesh sieve, and contains 43.44% Al2O3 and 54.55% SiO2. The waste clay brick powder has a fineness of passing through a 200-mesh sieve, and contains 12.89% Al2O3, 60.28% SiO2, 14.03% CaO, and 5.47% Fe2O3. The limestone powder has a particle size of less than 100 μm, and contains 85% calcite and 15% dolomite. The quicklime has a purity >95% and a specific surface area of ​​396 m². 2 / kg.

7. The mortar based on solid waste-based materials according to claim 1, characterized in that, The average particle size of the nano-CSH seeds is 152 nm, and the solid content is 19.26%.

8. The mortar based on solid waste-based materials according to claim 1, characterized in that, The alkanolamine is diethanol monoisopropanolamine, and the effective content of the alkanolamine is >85%.

9. A method for preparing mortar based on solid waste-based materials according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Weigh out the cement, metakaolin, waste clay brick powder, limestone powder, carbide slag and quicklime of each mass and mix them evenly to obtain the cementitious material. S2. Weigh out the nano-CSH seed crystals, alkanolamine, water, and standard sand by weight, and then mix them evenly with the cementitious material to obtain the mortar.

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