Coal gangue-based solid waste pavement base mixture and preparation method thereof

Abstract

The present application relates to the field of low-carbon environmental protection, in particular to a coal gangue-based solid waste pavement base mixture and a preparation method thereof, comprising the following raw materials in parts by weight: coal gangue solid waste 45-55 parts, cement 20-30 parts, aggregate agent 10-15 parts, functional comprehensive agent 7-11 parts, basalt fiber modified reinforcing aid 5-8 parts, and water 35-40 parts. The coal gangue-based solid waste pavement base mixture is prepared by mixing coal gangue solid waste with cement and aggregate agent, the coal gangue solid waste is obtained by crushing and pickling solid waste coal gangue, the aggregate agent is obtained by mixing and optimizing steel slag, gravel and river sand, and the mixture is prepared by mixing and matching the raw materials, adding the functional comprehensive agent and the basalt fiber modified reinforcing aid, and synergizing them together. The prepared pavement base mixture has freeze-thaw resistance, crack resistance and permeability resistance, and the product has excellent temperature resistance, corrosion resistance and stability, and excellent comprehensive coordination.

Description

Technical Field

[0001] This invention relates to the field of low-carbon and environmental protection technology, specifically to a coal gangue-based solid waste roadbed mixture and its preparation method. Background Technology

[0002] As a crucial area of ​​infrastructure construction, road engineering is increasingly facing high carbon emissions. To achieve low-carbon goals, solid waste recycling technology enables the recovery and reuse of solid waste, reducing carbon emissions during solid waste treatment. While existing technologies utilize solid waste such as coal gangue to achieve low-carbon practices, the resulting road base materials exhibit poor freeze-thaw resistance, crack resistance, and impermeability. Furthermore, the products suffer from poor temperature resistance, corrosion resistance, and overall performance, limiting their efficiency. Therefore, this invention provides further improvements. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a coal gangue-based solid waste roadbed mixture and its preparation method, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] This invention provides a coal gangue-based solid waste roadbed mixture, comprising the following raw materials in parts by weight:

[0006] 45-55 parts coal gangue solid waste, 20-30 parts cement, 10-15 parts aggregate agent, 7-11 parts functional reinforcing agent, 5-8 parts reinforcing agent modified with basalt fiber, and 35-40 parts water.

[0007] Preferably, the coal gangue solid waste is coal gangue that has been crushed to 100 mesh, then acid-washed with a sulfuric acid solution of 10-15% by mass, and then dried until the moisture content is less than 2%.

[0008] The aggregate is made by uniformly mixing steel slag, crushed stone and river sand in a weight ratio of (3~5):2:1~2); the particle size of crushed stone is 10~15mm, the particle size of steel slag is 5~8mm and the particle size of river sand is 2~5mm.

[0009] Preferably, the preparation method of the functional enhancer is as follows:

[0010] S01: Mix 3-5 parts of nano-calcium carbonate, 5-8 parts of ethanol aqueous solution, 2-3 parts of β-cyclodextrin and 2-4 parts of calcium sulfate whiskers thoroughly to obtain modified nano-calcium carbonate solution.

[0011] S02: Chitosan, glacial acetic acid and water are mixed evenly in a weight ratio of (3~5):1:(8~12) to obtain a chitosan solution;

[0012] 3-5 parts of magnesium olivine powder, 2-4 parts of nanocellulose and 2-3 parts of silicon carbide are mixed evenly, and then 4-7 parts of chitosan solution are added and ball-milled at a speed of 1000-1500 r / min for 2 hours. Then the mixture is filtered and dried to obtain the blending agent.

[0013] S03: Volcanic rock ash, titanium dioxide and yttrium nitrate solution are thoroughly mixed at a weight ratio of (3~5):(2~3):2 to obtain a compounding agent; the compounding agent and modified nano-calcium carbonate solution are stirred at a weight ratio of 3:(5~8) to obtain a functional compounding solution;

[0014] S04: The functional compounding liquid and the comprehensive conditioning agent are ball-milled at a weight ratio of (11~15):7, with a ball milling speed of 1500 r / min for 1~2 h. After ball milling, the mixture is filtered and dried to obtain the functional comprehensive conditioning agent.

[0015] Preferably, the ethanol aqueous solution has a mass fraction of 75-85%; the yttrium nitrate solution has a mass fraction of 2-5%.

[0016] Preferably, the stirring speed in S03 is 350~450 r / min, the stirring time is 2 h, and the stirring temperature is 55~60℃.

[0017] Preferably, the method for preparing the reinforcing agent modified with basalt fiber is as follows:

[0018] S11: Impregnate borosilicate and boric acid aqueous solution with a mass fraction of 7-9% at a weight ratio of 1:(2-3) for 25-35 min, then dry at 135-145℃ for 1 h, and finally calcine at 550℃ for 1-2 h to obtain boron-doped alumina.

[0019] S12: Mix attapulgite, sodium citrate solution and alginate in a weight ratio of (3~5):7:(1~2) thoroughly to obtain attapulgite solution; continue to mix 2~4 parts of cerium dioxide, 3~5 parts of graphene and 7~10 parts of attapulgite solution thoroughly to obtain reinforcing solution;

[0020] S13: Mix 5-8 parts of boron-doped alumina body and 15-25 parts of reinforcing liquid evenly to obtain a reinforcing body based on boron-doped alumina.

[0021] S14: The reinforcing agent based on boron-doped alumina and the basalt fiber additive were mixed and ball-milled at a weight ratio of (11-15):7. The ball milling speed was 1000-1500 r / min and the ball milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the reinforcing agent modified with basalt fiber.

[0022] Preferably, the sodium citrate solution has a mass fraction of 10-15%.

[0023] Preferably, the basalt fiber additive is prepared by:

[0024] Mix 2-4 parts of diatomaceous earth, 5-8 parts of illite and 10-15 parts of sodium dodecylbenzenesulfonate solution thoroughly to obtain illite solution;

[0025] 5-8 parts of basalt fiber, 3-5 parts of carbon nanotubes and 2-4 parts of silane coupling agent KH550 are mixed evenly to obtain a blend. The blend is then added to 10-15 parts of illite liquid and ultrasonically treated. Finally, it is filtered and dried to obtain basalt fiber additive.

[0026] Preferably, the sodium dodecylbenzenesulfonate solution has a mass fraction of 6-10%; the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 2 hours.

[0027] This invention also provides a method for preparing a coal gangue-based solid waste roadbed mixture, comprising the following steps:

[0028] Coal gangue solid waste, cement, aggregate agent, functional reinforcing agent, basalt fiber modified reinforcing agent, and water are added to a mixer in sequence and mixed to obtain the base mixture of the present invention. The mixing speed is 1150~1250 r / min and the mixing time is 1 hour.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] This invention relates to a coal gangue-based solid waste road base mixture, which uses coal gangue solid waste combined with cement and aggregates. The coal gangue solid waste is made from crushed and acid-washed coal gangue. Meanwhile, the aggregates are made from steel slag, crushed stone, and river sand. Through the blending and coordination of raw materials, as well as the addition of functional enhancers and basalt fiber modified reinforcing agents, the mixture achieves synergistic effects. The resulting road base mixture has freeze-thaw resistance, crack resistance, and impermeability. At the same time, the product has excellent temperature resistance, corrosion resistance, and overall good performance.

[0031] The functional blending agent is prepared by ball milling a mixture of functional blending liquid and blending agent. The functional blending liquid contains volcanic ash, titanium dioxide, and yttrium nitrate solution, which are blended together to form the blending agent. This is then combined with a modified nano-calcium carbonate solution. The nano-calcium carbonate, modified with β-cyclodextrin and calcium sulfate whiskers, exhibits improved dispersibility and a tighter bond with the mixture matrix, enhancing the strength, crack resistance, and impermeability of the mixture. The volcanic ash and titanium dioxide in the blending agent, combined with the modified nano-calcium carbonate solution, fill the internal pores of the mixture, reducing porosity and improving impermeability. Simultaneously, the calcium sulfate whiskers and volcanic ash enhance the mixture's freeze-thaw resistance, preventing material damage caused by low-temperature freezing and high-temperature thawing cycles, and extending the service life of the pavement. Meanwhile, magnesium olivine powder and silicon carbide possess excellent high-temperature resistance and corrosion resistance. Combined with nano-cellulose raw materials, they are incorporated into the system and further improved with chitosan solution. The resulting system of raw materials reinforces the product structure, enhancing its stability and optimizing performance coordination and stability.

[0032] The reinforcing agent modified with basalt fiber was prepared by ball milling a mixture of a reinforcing agent based on boron-doped alumina and a basalt fiber additive. The boron-doped alumina contained borosilicate particles that were impregnated with boric acid solution and calcined at high temperature, resulting in the removal of boron atoms (B...). 3+ ) partially replaces aluminum atoms (Al) in the alumina lattice 3+ The graphene, combined with cerium dioxide and the re-adjusted retracement liquid, forms a stable structure similar to mullite (3Al2O3·2SiO2), thereby optimizing the overall stability of the system performance. The graphene, combined with cerium dioxide and the re-adjusted retracement liquid, further enhances the system's performance coordination and stability. The basalt fiber and carbon nanotubes in the basalt fiber additive are incorporated into the system as reinforcements, while the diatomaceous earth and illite structures are further coordinated, further enhancing the system's performance and improving the product's performance. The needle-like structure of the basalt fiber, supported by the tubular structure of the carbon nanotubes, and further filled by the porous structure of diatomaceous earth and the layered structure of illite, forms a multi-structured complementary system, further enhancing the product's performance. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The coal gangue-based solid waste roadbed mixture of this embodiment includes the following raw materials in parts by weight:

[0035] 45-55 parts coal gangue solid waste, 20-30 parts cement, 10-15 parts aggregate agent, 7-11 parts functional reinforcing agent, 5-8 parts reinforcing agent modified with basalt fiber, and 35-40 parts water.

[0036] In this embodiment, the coal gangue solid waste material is coal gangue that has been crushed to 100 mesh, then acid-washed with a sulfuric acid solution with a mass fraction of 10-15%, and then dried until the moisture content is less than 2%.

[0037] The aggregate is made by uniformly mixing steel slag, crushed stone and river sand in a weight ratio of (3~5):2:(1~2); the particle size of crushed stone is 10~15mm, the particle size of steel slag is 5~8mm and the particle size of river sand is 2~5mm.

[0038] The preparation method of the functional enhancer in this embodiment is as follows:

[0039] S01: Mix 3-5 parts of nano-calcium carbonate, 5-8 parts of ethanol aqueous solution, 2-3 parts of β-cyclodextrin and 2-4 parts of calcium sulfate whiskers thoroughly to obtain modified nano-calcium carbonate solution.

[0040] S02: Chitosan, glacial acetic acid and water are mixed evenly in a weight ratio of (3~5):1:(8~12) to obtain a chitosan solution;

[0041] 3-5 parts of magnesium olivine powder, 2-4 parts of nanocellulose and 2-3 parts of silicon carbide are mixed evenly, and then 4-7 parts of chitosan solution are added and ball-milled at a speed of 1000-1500 r / min for 2 hours. Then the mixture is filtered and dried to obtain the blending agent.

[0042] S03: Volcanic rock ash, titanium dioxide and yttrium nitrate solution are thoroughly mixed at a weight ratio of (3~5):(2~3):2 to obtain a compounding agent; the compounding agent and modified nano-calcium carbonate solution are stirred at a weight ratio of 3:(5~8) to obtain a functional compounding solution;

[0043] S04: The functional compounding liquid and the comprehensive conditioning agent are ball-milled at a weight ratio of (11~15):7, with a ball milling speed of 1500 r / min for 1~2 h. After ball milling, the mixture is filtered and dried to obtain the functional comprehensive conditioning agent.

[0044] In this embodiment, the mass fraction of the ethanol aqueous solution is 75-85%; and the mass fraction of the yttrium nitrate solution is 2-5%.

[0045] In this embodiment, the stirring speed in S03 is 350~450 r / min, the stirring time is 2 h, and the stirring temperature is 55~60℃.

[0046] The preparation method of the reinforcing agent modified with basalt fiber in this embodiment is as follows:

[0047] S11: Impregnate borosilicate and boric acid aqueous solution with a mass fraction of 7-9% at a weight ratio of 1:(2-3) for 25-35 min, then dry at 135-145℃ for 1 h, and finally calcine at 550℃ for 1-2 h to obtain boron-doped alumina.

[0048] S12: Mix attapulgite, sodium citrate solution and alginate in a weight ratio of (3~5):7:(1~2) thoroughly to obtain attapulgite solution; continue to mix 2~4 parts of cerium dioxide, 3~5 parts of graphene and 7~10 parts of attapulgite solution thoroughly to obtain reinforcing solution;

[0049] S13: Mix 5-8 parts of boron-doped alumina body and 15-25 parts of reinforcing liquid evenly to obtain a reinforcing body based on boron-doped alumina.

[0050] S14: The reinforcing agent based on boron-doped alumina and the basalt fiber additive were mixed and ball-milled at a weight ratio of (11-15):7. The ball milling speed was 1000-1500 r / min and the ball milling time was 2 h. After the ball milling was completed, the mixture was filtered and dried to obtain the reinforcing agent modified with basalt fiber.

[0051] The sodium citrate solution in this embodiment has a mass fraction of 10-15%.

[0052] The preparation method of the basalt fiber additive in this embodiment is as follows:

[0053] Mix 2-4 parts of diatomaceous earth, 5-8 parts of illite and 10-15 parts of sodium dodecylbenzenesulfonate solution thoroughly to obtain illite solution;

[0054] 5-8 parts of basalt fiber, 3-5 parts of carbon nanotubes and 2-4 parts of silane coupling agent KH550 are mixed evenly to obtain a blend. The blend is then added to 10-15 parts of illite liquid and ultrasonically treated. Finally, it is filtered and dried to obtain basalt fiber additive.

[0055] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 6-10%; the ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment lasts for 2 hours.

[0056] The preparation method of the coal gangue-based solid waste road base course mixture in this embodiment includes the following steps:

[0057] Coal gangue solid waste, cement, aggregate agent, functional reinforcing agent, basalt fiber modified reinforcing agent, and water are added to a mixer in sequence and mixed to obtain the base mixture of the present invention. The mixing speed is 1150~1250 r / min and the mixing time is 1 hour.

[0058] Example 1: The coal gangue-based solid waste roadbed mixture of this example comprises the following raw materials in parts by weight:

[0059] The mixture consists of 45 parts coal gangue solid waste, 20 parts cement, 10 parts aggregate agent, 7 parts functional reinforcing agent, 5 parts reinforcing agent modified with basalt fiber, and 35 parts water.

[0060] In this embodiment, the coal gangue solid waste material is coal gangue that has been crushed to 100 mesh, then acid-washed with a 10% sulfuric acid solution, and then dried until the moisture content is less than 2%.

[0061] The aggregate is made by uniformly mixing steel slag, crushed stone and river sand in a weight ratio of 3:2:1; the particle size of crushed stone is 10mm, the particle size of steel slag is 5mm, and the particle size of river sand is 2~5mm.

[0062] The preparation method of the functional enhancer in this embodiment is as follows:

[0063] S01: Mix 3 parts of nano-calcium carbonate, 5 parts of ethanol aqueous solution, 2 parts of β-cyclodextrin and 2 parts of calcium sulfate whiskers thoroughly to obtain modified nano-calcium carbonate solution;

[0064] S02: Chitosan, glacial acetic acid and water are mixed evenly in a weight ratio of 3:1:8 to obtain a chitosan solution;

[0065] Three parts of magnesium olivine powder, two parts of nanocellulose and two parts of silicon carbide were mixed evenly, and then four parts of chitosan solution were added and ball-milled at 1000 r / min for 2 h. After that, the mixture was filtered and dried to obtain the blending agent.

[0066] S03: Volcanic rock ash, titanium dioxide, and yttrium nitrate solution are thoroughly mixed in a weight ratio of 3:2:2 to obtain a compounding agent; the compounding agent and modified nano-calcium carbonate solution are stirred in a weight ratio of 3:5 to obtain a functional compounding solution;

[0067] S04: The functional compounding liquid and the comprehensive conditioning agent are ball-milled at a weight ratio of 11:7, with a ball milling speed of 1500 r / min and a ball milling time of 1 h. After the ball milling is completed, the mixture is filtered and dried to obtain the functional comprehensive conditioning agent.

[0068] In this embodiment, the ethanol aqueous solution has a mass fraction of 75%, and the yttrium nitrate solution has a mass fraction of 2%.

[0069] In this embodiment, the stirring speed in S03 is 350 r / min, the stirring time is 2 h, and the stirring temperature is 55℃.

[0070] The preparation method of the reinforcing agent modified with basalt fiber in this embodiment is as follows:

[0071] S11: The pseudoboehmite and a 7% boric acid aqueous solution were impregnated at a weight ratio of 1:2 for 25 min, then dried at 135℃ for 1 h, and finally calcined at 550℃ for 1 h to obtain boron-doped alumina.

[0072] S12: Mix attapulgite, sodium citrate solution and alginate in a weight ratio of 3:7:1 thoroughly to obtain attapulgite solution; continue to mix 2 parts cerium dioxide, 3 parts graphene and 7 parts attapulgite solution thoroughly to obtain reinforcing solution;

[0073] S13: Mix 5 parts of boron-doped alumina body and 15 parts of reinforcing liquid evenly to obtain a reinforcing body based on boron-doped alumina.

[0074] S14: The reinforcing agent based on boron-doped alumina and basalt fiber additive were mixed and ball-milled at a weight ratio of 11:7 for 2 hours at a speed of 1000 r / min. After ball milling, the mixture was filtered and dried to obtain the reinforcing agent modified with basalt fiber.

[0075] The sodium citrate solution in this embodiment has a mass fraction of 10%.

[0076] The preparation method of the basalt fiber additive in this embodiment is as follows:

[0077] 2 parts diatomaceous earth, 5 parts illite and 10 parts sodium dodecylbenzenesulfonate solution were mixed thoroughly to obtain illite solution;

[0078] Five parts of basalt fiber, three parts of carbon nanotubes and two parts of silane coupling agent KH550 were mixed evenly to obtain a blend. The blend was then added to 10 parts of illite liquid and ultrasonically treated. Finally, it was filtered and dried to obtain the basalt fiber additive.

[0079] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 6%; the ultrasonic power for ultrasonic treatment is 350W, and the ultrasonic treatment lasts for 2 hours.

[0080] The preparation method of the coal gangue-based solid waste road base course mixture in this embodiment includes the following steps:

[0081] Coal gangue solid waste, cement, aggregate agent, functional reinforcing agent, basalt fiber modified reinforcing agent, and water are added to a mixer in sequence and mixed to obtain the base mixture of the present invention. The mixing speed is 1150 r / min and the mixing time is 1 h.

[0082] Example 2, the coal gangue-based solid waste roadbed mixture of this example includes the following raw materials in parts by weight:

[0083] The mixture consists of 55 parts coal gangue solid waste, 30 parts cement, 15 parts aggregate agent, 11 parts functional reinforcing agent, 8 parts reinforcing agent modified with basalt fiber, and 40 parts water.

[0084] In this embodiment, the coal gangue solid waste material is solid coal gangue that has been crushed to 100 mesh, then acid-washed with a 15% sulfuric acid solution, and then dried until the moisture content is less than 2%.

[0085] The aggregate is made by uniformly mixing steel slag, crushed stone and river sand in a weight ratio of 5:2:2; the particle size of crushed stone is 15mm, the particle size of steel slag is 8mm and the particle size of river sand is 5mm.

[0086] The preparation method of the functional enhancer in this embodiment is as follows:

[0087] S01: Mix 5 parts of nano-calcium carbonate, 8 parts of ethanol aqueous solution, 3 parts of β-cyclodextrin and 4 parts of calcium sulfate whiskers thoroughly to obtain modified nano-calcium carbonate solution.

[0088] S02: Chitosan, glacial acetic acid and water are mixed evenly in a weight ratio of 5:1:12 to obtain a chitosan solution;

[0089] Five parts of magnesium olivine powder, four parts of nanocellulose and three parts of silicon carbide were mixed evenly, and then seven parts of chitosan solution were added and ball-milled at 1500 r / min for 2 h. After filtration and drying, the general conditioning agent was obtained.

[0090] S03: Volcanic rock ash, titanium dioxide, and yttrium nitrate solution are thoroughly mixed at a weight ratio of 5:3:2 to obtain a compounding agent; the compounding agent and modified nano-calcium carbonate solution are stirred at a weight ratio of 3:8 to obtain a functional compounding solution;

[0091] S04: The functional compounding liquid and the comprehensive conditioning agent are ball-milled at a weight ratio of 15:7, with a ball milling speed of 1500 r / min for 2 hours. After ball milling, the mixture is filtered and dried to obtain the functional comprehensive conditioning agent.

[0092] In this embodiment, the ethanol aqueous solution has a mass fraction of 85%; the yttrium nitrate solution has a mass fraction of 5%.

[0093] In this embodiment, the stirring speed in S03 is 450 r / min, the stirring time is 2 h, and the stirring temperature is 60 °C.

[0094] The preparation method of the reinforcing agent modified with basalt fiber in this embodiment is as follows:

[0095] S11: The pseudoboehmite and a 9% boric acid aqueous solution were impregnated at a weight ratio of 1:3 for 35 min, then dried at 145℃ for 1 h, and finally calcined at 550℃ for 2 h to obtain boron-doped alumina.

[0096] S12: Mix attapulgite, sodium citrate solution and alginate in a weight ratio of 5:7:2 thoroughly to obtain attapulgite solution; continue to mix 4 parts cerium dioxide, 5 parts graphene and 10 parts attapulgite solution thoroughly to obtain reinforcing solution;

[0097] S13: Mix 8 parts of boron-doped alumina body and 25 parts of reinforcing liquid evenly to obtain a reinforcing body based on boron-doped alumina.

[0098] S14: The reinforcing agent based on boron-doped alumina and basalt fiber additive were mixed and ball-milled at a weight ratio of 15:7 for 2 hours at a speed of 1500 r / min. After ball milling, the mixture was filtered and dried to obtain the reinforcing agent modified with basalt fiber.

[0099] The sodium citrate solution in this embodiment has a mass fraction of 15%.

[0100] The preparation method of the basalt fiber additive in this embodiment is as follows:

[0101] 4 parts diatomaceous earth, 8 parts illite and 15 parts sodium dodecylbenzenesulfonate solution were mixed thoroughly to obtain illite solution;

[0102] Eight parts of basalt fiber, five parts of carbon nanotubes and four parts of silane coupling agent KH550 were mixed evenly to obtain a blend. The blend was then added to 15 parts of illite liquid and ultrasonically treated. Finally, it was filtered and dried to obtain the basalt fiber additive.

[0103] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 10%; the ultrasonic power for ultrasonic treatment is 400W, and the ultrasonic treatment lasts for 2 hours.

[0104] The preparation method of the coal gangue-based solid waste road base course mixture in this embodiment includes the following steps:

[0105] Coal gangue solid waste, cement, aggregate agent, functional reinforcing agent, basalt fiber modified reinforcing agent, and water are added to a mixer in sequence and mixed to obtain the base mixture of the present invention. The mixing speed is 1250 r / min and the mixing time is 1 h.

[0106] Example 3: The coal gangue-based solid waste roadbed mixture of this example includes the following raw materials in parts by weight:

[0107] The mixture consists of 50 parts coal gangue solid waste, 25 parts cement, 12.5 parts aggregate agent, 9 parts functional reinforcing agent, 6.5 parts reinforcing agent modified with basalt fiber, and 37.5 parts water.

[0108] In this embodiment, the coal gangue solid waste material is coal gangue that has been crushed to 100 mesh, then acid-washed with a 12.5% ​​sulfuric acid solution, and then dried until the moisture content is less than 2%.

[0109] The aggregate is made by uniformly mixing steel slag, crushed stone and river sand in a weight ratio of 4:2:1.5; the particle size of crushed stone is 12.5mm, the particle size of steel slag is 6.5mm and the particle size of river sand is 3.5mm.

[0110] The preparation method of the functional enhancer in this embodiment is as follows:

[0111] S01: Mix 4 parts of nano-calcium carbonate, 6.5 parts of ethanol aqueous solution, 2.5 parts of β-cyclodextrin and 3 parts of calcium sulfate whiskers thoroughly to obtain modified nano-calcium carbonate solution;

[0112] S02: Chitosan, glacial acetic acid and water are mixed evenly in a weight ratio of 4:1:10 to obtain a chitosan solution;

[0113] Four parts of magnesium olivine powder, three parts of nanocellulose and 2.5 parts of silicon carbide were mixed evenly, and then 5.5 parts of chitosan solution were added and ball-milled at 1250 r / min for 2 h. After filtration and drying, the general conditioning agent was obtained.

[0114] S03: Volcanic rock ash, titanium dioxide, and yttrium nitrate solution are thoroughly mixed at a weight ratio of 4:2.5:2 to obtain a compounding agent; the compounding agent and modified nano-calcium carbonate solution are stirred at a weight ratio of 3:6.5 to obtain a functional compounding solution;

[0115] S04: The functional compounding liquid and the comprehensive conditioning agent were ball-milled at a weight ratio of 13:7, with a ball milling speed of 1500 r / min for 1.5 h. After ball milling, the mixture was filtered and dried to obtain the functional comprehensive conditioning agent.

[0116] In this embodiment, the ethanol aqueous solution has a mass fraction of 80%, and the yttrium nitrate solution has a mass fraction of 3.5%.

[0117] In this embodiment, the stirring speed in S03 is 400 r / min, the stirring time is 2 h, and the stirring temperature is 58℃.

[0118] The preparation method of the reinforcing agent modified with basalt fiber in this embodiment is as follows:

[0119] S11: The pseudoboehmite and 8% boric acid aqueous solution were impregnated at a weight ratio of 1:2.5 for 30 min, then dried at 140℃ for 1 h, and finally calcined at 550℃ for 1.5 h to obtain boron-doped alumina.

[0120] S12: Mix attapulgite, sodium citrate solution and alginate in a weight ratio of 4:7:1.5 thoroughly to obtain attapulgite solution; continue to mix 3 parts cerium dioxide, 4 parts graphene and 8 parts attapulgite solution thoroughly to obtain reinforcing solution;

[0121] S13: Mix 6.5 parts of boron-doped alumina body and 20 parts of reinforcing liquid evenly to obtain a reinforcing body based on boron-doped alumina body;

[0122] S14: The reinforcing agent based on boron-doped alumina and basalt fiber additive were mixed and ball-milled at a weight ratio of 13:7 for 2 hours at a speed of 1250 r / min. After ball milling, the mixture was filtered and dried to obtain the reinforcing agent modified with basalt fiber.

[0123] The sodium citrate solution in this embodiment has a mass fraction of 12.5%.

[0124] The preparation method of the basalt fiber additive in this embodiment is as follows:

[0125] Three parts of diatomaceous earth, 6.5 parts of illite, and 12.5 parts of sodium dodecylbenzenesulfonate solution were thoroughly mixed to obtain illite solution;

[0126] 6.5 parts of basalt fiber, 4 parts of carbon nanotubes and 3 parts of silane coupling agent KH550 were mixed evenly to obtain a blend. The blend was then added to 12.5 parts of illite liquid and ultrasonically treated. Finally, it was filtered and dried to obtain basalt fiber additive.

[0127] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 8%; the ultrasonic power for ultrasonic treatment is 375W, and the ultrasonic treatment lasts for 2 hours.

[0128] The preparation method of the coal gangue-based solid waste road base course mixture in this embodiment includes the following steps:

[0129] Coal gangue solid waste, cement, aggregate agent, functional reinforcing agent, basalt fiber modified reinforcing agent, and water are added to a mixer in sequence and mixed to obtain the base mixture of the present invention. The mixing speed is 1200 r / min and the mixing time is 1 h.

[0130] Comparative Example 1 differs from Example 3 in that no functional enhancer was added.

[0131] Comparative Example 2 differs from Example 3 in that no conditioning agent was added during the preparation of the functional enhancer.

[0132] Comparative Example 3 differs from Example 3 in that it does not contain magnesium olivine powder or nanocellulose in the conditioning agent.

[0133] Comparative Example 4 differs from Example 3 in that silicon carbide was not added to the conditioning agent and chitosan solution treatment was not used.

[0134] Comparative Example 5 differs from Example 3 in that no functional blending solution was added during the preparation of the functional enhancer.

[0135] Comparative Example 6 differs from Example 3 in that no conditioning agent was added to the functional conditioning solution.

[0136] Comparative Example 7 differs from Example 3 in that no modified nano-calcium carbonate solution was added to the functional compounding solution.

[0137] Comparative Example 8 differs from Example 3 in that no nano-calcium carbonate or calcium sulfate whiskers were added during the preparation of the modified nano-calcium carbonate solution.

[0138] Comparative Example 9 differs from Example 3 in that it did not contain any reinforcing agent modified with basalt fibers.

[0139] Comparative Example 10 differs from Example 3 in that no boron-doped alumina-based reinforcing agent was added during the preparation of the basalt fiber modified reinforcing agent.

[0140] Comparative Example 11 differs from Example 3 in that no boron-doped alumina body was added during the preparation of the boron-doped alumina reinforcement.

[0141] Comparative Example 12 differs from Example 3 in that no reinforcing liquid was added during the preparation of the boron-doped alumina reinforcing agent.

[0142] Comparative Example 13 differs from Example 3 in that cerium dioxide and graphene were not added to the reinforcing liquid.

[0143] Comparative Example 14 differs from Example 3 in that no basalt fiber additive was added during the preparation of the reinforcing agent modified with basalt fiber.

[0144] Examples 1-3 and Comparative Examples 1-14 were subjected to freeze-thaw resistance (tested according to the rapid freeze-thaw method in GB / T50082-2009 Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete, with 300 rapid freeze-thaw cycles), crack resistance, and impermeability tests. Simultaneously, the products were tested for temperature change resistance and corrosion resistance (the products were placed at 70℃ for 12 hours, then at 90℃ for 12 hours, and finally under 2% hydrochloric acid mist for 12 hours; this constituted one cycle, and 10 cycles were performed). The performance tests are as follows:

[0145]

[0146] As can be seen from Comparative Examples 1-14 and Examples 1-3, the freeze-thaw resistance, crack resistance and impermeability of the product in Example 3 can be improved in a coordinated manner. At the same time, the product's performance stability is significantly improved under temperature change and corrosion resistance conditions.

[0147] As can be seen from Comparative Examples 1-14 and Example 3, the performance of the product deteriorates significantly when neither the functional reinforcing agent nor the reinforcing agent modified with basalt fiber is added. The product's performance is most significantly improved when both are combined and synergistically formulated.

[0148] In the preparation of the functional enhancer, no blending agent was added; in the blending agent, no magnesium olivine powder, nanocellulose, or silicon carbide were added; and chitosan solution treatment was not used. In the preparation of the functional enhancer, no functional compounding liquid was added; in the functional compounding liquid, no compounding agent was added; in the functional compounding liquid, no modified nano-calcium carbonate solution was added; and in the preparation of the modified nano-calcium carbonate solution, no nano-calcium carbonate and calcium sulfate whiskers were added. The performance of the products all showed a trend of deterioration to varying degrees. The functional enhancer prepared by combining the functional compounding liquid obtained by the specific method of this invention with the blending agent showed the most significant performance effect. At the same time, the preparation of the functional compounding liquid and the blending agent of this invention are unique. The product obtained by using the technical solution of this invention has the most significant performance effect.

[0149] In the preparation of reinforcing agents modified with basalt fibers, no boron-doped alumina-based reinforcing material was added; in the preparation of boron-doped alumina-based reinforcing materials, no boron-doped alumina body was added; in the preparation of boron-doped alumina-based reinforcing materials, no reinforcing liquid was added; and in the reinforcing liquid, no cerium dioxide or graphene was added. Furthermore, no basalt fiber additive was added in the preparation of reinforcing agents modified with basalt fibers. All these methods resulted in varying degrees of performance degradation. The preparation method of the reinforcing agent modified with basalt fibers in this invention is unique, and other methods used to replace the technical solution of this invention are not as effective as the technical solution of this invention. Moreover, the absence of basalt fiber additives in the preparation of reinforcing agents modified with basalt fibers leads to significant performance changes in the products, indicating that the addition of basalt fiber additives has a significant impact on product performance.

[0150] This invention further explores the performance of the product through the preparation of basalt fiber additives;

[0151] Experimental Example 1 is the same as Example 3, except that basalt fiber was not added to the basalt fiber additive.

[0152] Experimental Example 2 is the same as Example 3, except that carbon nanotubes were not added to the basalt fiber additive.

[0153] Experimental Example 3 is the same as Example 3, except that illite liquid was not added to the basalt fiber additive.

[0154] Experimental Example 4 was the same as Example 3, except that diatomaceous earth was not added to the illite liquid.

[0155] Experimental Example 5 was the same as Example 3, except that illite was not added to the illite solution.

[0156] The present invention performs further performance tests on the products of Experimental Examples 1-5, and the performance tests are as follows:

[0157]

[0158] As can be seen from Experiments 1-5, the performance of the basalt fiber additives is significantly worse when basalt fiber or illite liquid is not added. Similarly, the performance of the basalt fiber additives also tends to deteriorate when carbon nanotubes, diatomaceous earth, or illite liquid is not added. Only the basalt fiber additive prepared using the specific method of this invention exhibits the most significant performance improvement. In the preparation of illite liquid, all raw materials are indispensable; only the specific raw material ratio of this invention is used. Using other raw material ratios does not yield the same significant effect as this invention.

[0159] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0160] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A coal gangue-based solid waste pavement base mixture, characterized in that, The coal gangue solid waste is crushed to 100 mesh, and then washed with a 10-15% sulfuric acid solution, and then dried to a water content of less than 2%. The preparation method of the functional comprehensive agent is as follows: S01: 3-5 parts of nano calcium carbonate, 5-8 parts of an ethanol aqueous solution, 2-3 parts of β-cyclodextrin, and 2-4 parts of calcium sulfate whiskers are fully blended to obtain a modified nano calcium carbonate liquid; S02: chitosan, glacial acetic acid, and water are uniformly blended according to a weight ratio of (3-5):1:(8-12) to obtain a chitosan solution; 3-5 parts of forsterite powder, 2-4 parts of nano cellulose, and 2-3 parts of silicon carbide are uniformly blended, and then 4-7 parts of the chitosan solution is added and ball-milled, at a ball-milling speed of 1000-1500 r / min, for 2 h, and then filtered and dried to obtain a comprehensive adjusting agent; S03: volcanic rock ash, titanium dioxide, and yttrium nitrate solution are fully blended according to a weight ratio of (3-5):(2-3):2 to obtain a complex adjusting agent; The complex adjusting agent and the modified nano calcium carbonate liquid are stirred according to a weight ratio of 3:(5-8) to obtain a functional complex adjusting liquid; S04: The functional complex adjusting liquid and the comprehensive adjusting agent are ball-milled according to a weight ratio of (11-15):7, at a ball-milling speed of 1500 r / min, for 1-2 h, and then filtered and dried to obtain the functional comprehensive agent. The preparation method of the basalt fiber modified reinforcing aid is as follows: S11: pseudo-boehmite and a 7-9% boric acid aqueous solution are immersed according to a weight ratio of 1:(2-3) for 25-35 min, then dried at 135-145 ℃ for 1 h, and finally calcined at 550 ℃ for 1-2 h to obtain boron-doped aluminum oxide bodies; S12: attapulgite, sodium citrate solution, and alginic acid are fully blended according to a weight ratio of (3-5):7:(1-2) to obtain an attapulgite liquid; 2-4 parts of cerium dioxide, 3-5 parts of graphene, and 7-10 parts of the attapulgite liquid are further fully blended to obtain a reinforcing liquid; S13: 5-8 parts of the boron-doped aluminum oxide bodies and 15-25 parts of the reinforcing liquid are uniformly blended to obtain a boron-doped aluminum oxide-based reinforcing body; S14: The boron-doped aluminum oxide-based reinforcing body and the basalt fiber additive are ball-milled according to a weight ratio of (11-15):7, at a ball-milling speed of 1000-1500 r / min, for 2 h, and then filtered and dried to obtain the basalt fiber modified reinforcing aid. The coal gangue solid waste is crushed to 100 mesh, and then washed with a 10-15% sulfuric acid solution, and then dried to a water content of less than 2%.

2. The coal refuse-based solid waste pavement base mixture of claim 1, wherein, The aggregate agent is uniformly blended from steel slag, gravel, and river sand according to a weight ratio of (3-5):2:(1-2); the particle size of the gravel is 10-15 mm, the particle size of the steel slag is 5-8 mm, and the particle size of the river sand is 2-5 mm. The mass fraction of the ethanol aqueous solution is 75-85%, and the mass fraction of the yttrium nitrate solution is 2-5%.

3. The coal refuse-based solid waste pavement base mixture of claim 2, wherein, ​ 4. The coal refuse-based solid waste pavement base mixture of claim 3, wherein, The stirring speed of the stirring treatment in S03 is 350-450 r / min, the stirring time is 2 h, and the stirring temperature is 55-60 DEG C.

5. The coal refuse-based solid waste pavement base mixture of claim 4, wherein, The mass fraction of the sodium citrate solution is 10-15%.

6. The coal refuse-based solid waste pavement base mixture of claim 5, wherein, The preparation method of the basalt fiber additive is as follows: 2-4 parts of diatomite, 5-8 parts of illite and 10-15 parts of sodium dodecyl benzene sulfonate solution are fully blended to obtain an illite liquid; 5-8 parts of basalt fiber, 3-5 parts of carbon nanotube and 2-4 parts of silane coupling agent KH550 are uniformly blended to obtain a blended material, the blended material is added into 10-15 parts of the illite liquid for ultrasonic treatment, and finally, the mixture is extracted, dried to obtain the basalt fiber additive.

7. The coal refuse-based solid waste pavement base mixture of claim 6, wherein, The mass fraction of the sodium dodecyl benzene sulfonate solution is 6-10%, the ultrasonic power for the ultrasonic treatment is 350-400 W, and the ultrasonic treatment time is 2 h.

8. The method of claim 1 to 7, wherein the coal gangue-based solid waste pavement base mixture is prepared by mixing the coal gangue-based solid waste, the fine aggregate, the coarse aggregate, the cement, the water, and the additive. The method comprises the following steps: The coal gangue solid waste, cement, aggregate agent, functional comprehensive agent, basalt fiber additive and water are sequentially added into a mixer for mixing treatment, and a base layer mixture is obtained, wherein the mixing speed is 1150-1250 r / min, and the mixing time is 1 h.

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