Highly flexural road concrete material and preparation method thereof

Abstract

The invention relates to the technical field of concrete, in particular to a high-bending-resistance road concrete material and a preparation method thereof.The high-bending-resistance road concrete material is prepared from, by weight, 100 parts of aluminate cement, 6-8 parts of filler, 1-1.4 parts of additive, 350-400 parts of basalt coarse aggregate, 200-250 parts of medium sand, 33-37 parts of mixing water and 0.7-0.9 part of polycarboxylate superplasticizer. In the invention, the additive powder modified by the composite solution is mixed with the mineral powder activated by the premixed solution to form a filler with a microporous structure and rich surface functional groups, the microporous structure can internally maintain moisture, so that cement is fully hydrated and pores are refined, and the functional groups can generate a synergistic effect with cement ions and fibers in the additive, so that the cement can be fully hydrated. Cracks are not easy to expand when the interior of a concrete matrix bears bending stress, and fibers in the additives inhibit crack expansion through a bridging effect, so that the fracture resistance of the road concrete material is also improved.

Description

Technical Field

[0001] This invention relates to the field of concrete technology, specifically to a high flexural strength road concrete material and its preparation method. Background Technology

[0002] Concrete is an artificial stone material formed by mixing cementitious materials, aggregates, water, and, when necessary, chemical admixtures and mineral additives in a certain proportion and then hardening it. It is an important building material in the world and is commonly used in the construction of houses, roads, etc., with a wide range of applications.

[0003] In existing technologies, the most widely used material is ordinary concrete, which uses silicate cement as a binder and sand and gravel as aggregates. It mainly relies on the hard and brittle calcium silicate gel produced by cement hydration to bind the aggregates together. When subjected to bending, tension or impact loads, stress is easily concentrated in the interface area and micro-defects, causing cracks to propagate and connect rapidly, resulting in sudden fracture without obvious warning. Therefore, insufficient flexural strength is the main reason that ordinary concrete is restricted from being used as a high-performance pavement material.

[0004] Based on this, the present invention provides a high flexural strength road concrete material and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to provide a high flexural strength road concrete material and its preparation method.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a high flexural strength road concrete material, the raw materials of which are composed of the following parts by weight: 100 parts of aluminate cement, 6-8 parts of filler, 1-1.4 parts of additives, 350-400 parts of basalt coarse aggregate, 200-250 parts of medium sand, 33-37 parts of mixing water and 0.7-0.9 parts of polycarboxylate superplasticizer; The filler includes raptosite powder, sepiolite powder, premixed liquid, and additive powder; The additive powder includes a composite solution, steel slag, and corn cob residue.

[0007] Furthermore, the method for preparing the filler includes the following steps: Step 1: Mix rapartite powder and sepiolite powder at a mass ratio of 3:1 to obtain mixed mineral powder. Add the premixed liquid and stir at 55-60℃ and 200-220rpm for 1.5-2 hours to obtain a slurry. Step 2: Mix the slurry and the additive powder at a mass ratio of 1:(0.8-1), stir at 300-500 rpm for 0.6-1 h at 55-60℃, filter the product, wash the first filter residue until neutral, dry at 80-100℃ for 3-3.5 h, pulverize and pass through a 1000-mesh sieve to obtain the filler; The amount of premixed liquid added is 200-220% of the mass of the mixed mineral powder.

[0008] Furthermore, the preparation method of the additive powder includes the following steps: mixing steel slag and corn cob residue at 1000-1200 rpm for 10-15 min, pulverizing the obtained product, passing it through a 200-mesh sieve to obtain mixed powder, adding a composite solution to the mixed powder, stirring at 50-55℃ and 200-250 rpm for 1.2-1.5 h, filtering to obtain a second filter residue, washing, drying at 105-110℃ for 2.5-3 h, calcining at 600-650℃ for 1.5-2 h, cooling to room temperature, and grinding to obtain the additive powder, wherein the mass ratio of steel slag to corn cob residue is 2:1, and the amount of composite solution used is 180-200% of the mass of the mixed powder.

[0009] Further, the preparation method of the premixed solution includes the following steps: heating deionized water to 40-45℃, adding sodium dodecyl sulfonate, mixing at 150-180 rpm, stirring until completely dissolved, adding citric acid monohydrate, and continuing to stir at the original speed for 30-40 min to obtain the premixed solution. The mass ratio of sodium dodecyl sulfonate, citric acid monohydrate, and deionized water is (1.5-2):(3.5-4.5):100.

[0010] Furthermore, the composite solution is prepared by mixing the treatment liquid and the auxiliary agent at a mass ratio of 3:1 at 150-200 rpm for 20-25 min.

[0011] Further, the preparation method of the treatment solution includes the following steps: take dried grape pomace, grind it through a 60-mesh sieve, mix the obtained product with deionized water at a mass ratio of 1:(8-10), stir at 60-65℃ and 180-200rpm for 45-60min, filter to obtain a base solution, mix the base solution, aminosulfonic acid and sodium dihydrogen phosphate at a mass ratio of 100:(5-7):(2-3), stir to dissolve at 40-45℃ and 150-180rpm to obtain the treatment solution.

[0012] Furthermore, the preparation method of the auxiliary agent includes the following steps: Step A: Inoculate the oyster mushroom spawn into a sterilized culture medium and let it stand at 25°C in the dark until the mycelium completely covers the culture medium. Dry the mycelium at 60°C and then pulverize it through a 40-mesh sieve to obtain the substrate powder. Step B: Mix the matrix powder with ferrous sulfate heptahydrate solution at a mass ratio of 1:5, shake at 35℃ and 130-180 rpm for 2 hours, filter to obtain the third filter residue, and then dry at 60℃ for 2-4 hours to obtain the base material; Step C: Mix the base material and sodium alginate solution at a mass ratio of 1:3. Add the resulting product to the composite solution through a dropper. Let it stand in the coagulation bath for 30 minutes, filter, collect the intermediate solid, and rinse it twice with 1-2 times its mass of deionized water to obtain the additive. The wheat bran and corn cob residue were mixed in a 1:1 ratio and placed in the culture medium, with a water content of 60%. The ferrous sulfate heptahydrate solution had a mass concentration of 5%, the sodium alginate solution had a mass concentration of 3%, and the composite solution was obtained by mixing calcium chloride, sodium silicate, and water in a mass ratio of (1-3):(4-6):(90-95).

[0013] Furthermore, the method for preparing the additive includes the following steps: Step a: Add polyvinyl butyral to ethanol and stir at 60-65℃ and 200-250rpm for 2-3 hours until completely dissolved to obtain a matrix solution. Add waste glass powder and nano alumina that have passed through a 300-mesh sieve and mix at 800-1000rpm for 30-45 minutes to obtain the stock solution. Step b: Inject the stock solution into the electrospinning device and spin under the conditions of a feed rate of 0.8-1.2 mL / h, a voltage of 18-22 kV, a receiving distance of 15-18 cm, and an ambient humidity of 35-45%. The receiving roller speed is 800-1000 rpm to obtain a silk film. Step c: Place the silk film at 120-140℃ for 15-25 minutes, then cut it into small pieces with a length of 2-4mm using a pulverizer. This is the additive.

[0014] Further, the mass ratio of polyvinyl butyral to ethanol is 1:(4-4.5), and the mass ratio of matrix solution, waste glass powder and nano alumina is 1:(0.08-0.12):(0.03-0.05).

[0015] Secondly, the present invention provides a method for preparing a high flexural strength road concrete material, characterized by comprising the following steps: S1: Weigh out basalt coarse aggregate and medium sand as needed, dry mix at 100-150 rpm for 1-2 minutes, add aluminate cement, filler and additives, adjust the speed to 150-200 rpm and mix for 2-3 minutes to obtain the first mixture; S2: Dissolve the polycarboxylate superplasticizer in the mixing water and stir until completely dissolved to obtain the second mixture; S3: Gradually add the second mixture to the first mixture and stir at 200-250 rpm for 3-5 minutes to obtain high flexural strength road concrete material.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the organic acid components and functional components in the composite solution etch and activate the surface of steel slag particles, enabling them to continuously participate in the secondary hydration reaction in the alkaline environment of cement, generating a dense product with cementing ability that tightly fills the pores of cement stone. Secondly, the composite solution synergistically acts on corn cob residue, promoting the formation of biochar with a better structure and more reasonable pore distribution during subsequent roasting. The carbonized skeleton and the gel microspheres in the composite solution provide a microporous structure and reinforcing phase. These components, combined with the mineral powder activated by the premixed solution, form a microporous structure and... The filler, rich in surface functional groups, can be uniformly distributed in concrete. On the one hand, its microporous structure can retain moisture, promote full cement hydration, and refine pores. On the other hand, its surface functional groups can synergistically interact with cement ions and fibers in the additives, making it difficult for cracks to propagate inside the concrete matrix when subjected to bending stress. The fibers in the additives inhibit crack propagation through bridging and continuously dissipate fracture energy through processes such as interface debonding and fiber pull-out, realizing the transformation from brittle fracture to quasi-ductile failure mode, and jointly improving the flexural strength of road concrete materials.

[0017] 2. In this invention, the biochar component in the filler promotes the full hydration of cement in the surface area through internal curing, generating more high-strength hydration products with low porosity. These products intertwine with the secondary hydration products of activated steel slag, forming a reinforced surface layer with low porosity and high microhardness. Meanwhile, the fiber bridging structure in the additives prevents the layered peeling and crack penetration of the surface material. This dense surface structure, achieved through fiber action, reduces the wear per unit area, solving the wear problem caused by insufficient hydration and lack of reinforcing phase on traditional concrete surfaces, and improving the wear resistance of road concrete materials.

[0018] 3. In this invention, the micro-nano pores of biochar in the filler act as a moisture buffer carrier, reducing the content and connectivity of free water in the matrix through physical adsorption, thereby reducing the volume of freezeable water. During freeze-thaw cycles, the fiber bridging structure can suppress the expansion stress caused by water crystallization and inhibit the propagation of microcracks. The composite solution activates the steel slag, stabilizing components such as free calcium oxide and eliminating the synergistic damage caused by the volume expansion of solid waste and freeze-thaw stress. These combined effects enable the material to maintain its integrity and stability after multiple freeze-thaw cycles, improving the durability of concrete in cold and humid environments caused by internal moisture phase change and expansion stress, and enhancing the freeze-thaw resistance of road concrete materials. Attached Figure Description

[0019] Figure 1 The present invention provides a flowchart of a high flexural strength road concrete material and its preparation method. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the raw materials used in the following embodiments are all commercially available. Example

[0022] A high flexural strength road concrete material, the raw materials are composed of the following parts by weight: 100 parts aluminate cement, 6 parts filler, 1 part additive, 350 parts basalt coarse aggregate, 200 parts medium sand, 33 parts mixing water and 0.7 parts polycarboxylate superplasticizer. The fillers include raptor powder, sepiolite powder, premix, and additive powder; Additives include composite solutions, steel slag, and corn cob residue.

[0023] Preparation of filler: Step 1: Mix rapartite powder and sepiolite powder at a mass ratio of 3:1 to obtain mixed mineral powder. Mix the premixed liquid with the mixed mineral powder at a mass ratio of 2:1 and stir at 55℃ and 200rpm for 1.5h to obtain a slurry. Step 2: Add 80% of the additive powder by weight to the slurry, stir at 55℃ and 300rpm for 0.6h, filter the product to obtain the first filter residue, wash until neutral, dry at 80℃ for 3h, pulverize, and pass through a 1000-mesh sieve to obtain the filler. Preparation of additive powder: Steel slag and corn cob residue were mixed at a mass ratio of 2:1 and stirred at 1000 rpm for 10 min. The resulting product was pulverized and passed through a 200-mesh sieve to obtain a mixed powder. A composite solution of 180% of its mass was added to the mixed powder and stirred at 50℃ and 200 rpm for 1.2 h. The mixture was filtered to obtain a second filter residue, which was washed, dried at 105℃ for 2.5 h, and then calcined at 600℃ for 1.5 h. After cooling to room temperature, the mixture was ground to obtain the additive powder. The composite solution was prepared by mixing the treatment liquid and the additive at a mass ratio of 3:1 at 150 rpm for 20 min.

[0024] Preparation of the premix: Sodium dodecyl sulfonate was added to deionized water at 40°C and stirred at 150 rpm until completely dissolved. Then, citric acid monohydrate was added and stirred at the original speed for 30 min to obtain the premix. The mass ratio of sodium dodecyl sulfonate, citric acid monohydrate, and deionized water was 1.5:3.5:100.

[0025] Preparation of the treatment solution: Add dried grape pomace powder that has passed through a 60-mesh sieve to deionized water, stir at 60℃ and 180 rpm for 45 min, filter to obtain the base solution, mix the base solution, aminosulfonic acid and sodium dihydrogen phosphate in a mass ratio of 100:5:2, stir to dissolve at 40℃ and 150 rpm to obtain the treatment solution, wherein the amount of dried grape pomace powder added is 10% of the mass of deionized water.

[0026] The preparation method of the auxiliary agent includes the following steps: Step A: Add wheat bran and corn cob residue to a sterilized culture medium at a mass ratio of 1:1, and make the moisture content of the culture medium 60%. Inoculate the oyster mushroom spawn into the culture medium and let it stand at 25°C in the dark until the mycelium completely covers the culture medium. Dry the mycelium at 60°C and then crush it through a 40-mesh sieve to obtain the substrate powder. Step B: Add the matrix powder to a 5% ferrous sulfate heptahydrate solution, shake at 35°C and 130 rpm for 2 hours, filter to obtain the third filter residue, and then dry at 60°C for 2 hours to obtain the base material. The matrix powder and ferrous sulfate heptahydrate solution are mixed at a mass ratio of 1:5. Step C: The base material is mixed with a 3% sodium alginate solution. The resulting product is dripped into the composite solution through a dropper. The mixture is left to stand in a coagulation bath for 30 minutes, filtered, and the intermediate solid is collected. The solid is rinsed twice with deionized water at a mass ratio of 1:3 to obtain the additive. The mass ratio of the base material to the sodium alginate solution is 1:3, and the composite solution is obtained by mixing calcium chloride, sodium silicate, and water at a mass ratio of 1:4:90.

[0027] Preparation of additives: Step a: Mix polyvinyl butyral and ethanol at a mass ratio of 1:4, stir at 60℃ and 200 rpm for 2 hours until completely dissolved to obtain a matrix solution. Add waste glass powder and nano alumina that have passed through a 300-mesh sieve, mix at 800 rpm for 30 minutes to obtain the stock solution. The amount of waste glass powder added is 8% of the mass of the matrix solution, and the amount of nano alumina added is 3% of the mass of the matrix solution. Step b: Inject the stock solution into the electrospinning device and spin under the conditions of a feed rate of 0.8 mL / h, a voltage of 18 kV, a receiving distance of 15 cm, and an ambient humidity of 35%. The receiving roller speed is 800 rpm to obtain a silk film. Step c: Place the silk film at 120°C for 15 minutes, then cut it into small pieces with a length of 2mm using a pulverizer. This is the additive.

[0028] Preparation of high flexural strength road concrete materials: S1: Weigh out basalt coarse aggregate and medium sand as needed, mix at 100 rpm for 1 min, add aluminate cement, filler and additives, adjust the speed to 150 rpm and mix for 2 min to obtain the first mixture; S2: Dissolve the polycarboxylate superplasticizer in the mixing water and stir until completely dissolved to obtain the second mixture; S3: Gradually add the second mixture to the first mixture and stir at 200 rpm for 3 minutes to obtain a high flexural strength road concrete material. Example

[0029] A high flexural strength road concrete material, the raw materials of which are composed of the following parts by weight: 100 parts aluminate cement, 7 parts filler, 1.2 parts additive, 375 parts basalt coarse aggregate, 225 parts medium sand, 35 parts mixing water and 0.8 parts polycarboxylate superplasticizer; The fillers include raptor powder, sepiolite powder, premix, and additive powder; Additives include composite solutions, steel slag, and corn cob residue.

[0030] Preparation of filler: Step 1: Mix rapartite powder and sepiolite powder at a mass ratio of 3:1 to obtain mixed mineral powder. Mix the premixed liquid with the mixed mineral powder at a mass ratio of 2.1:1 and stir at 57℃ and 210 rpm for 1.7 h to obtain a slurry. Step 2: Add 90% of the additive powder by weight to the slurry, stir at 57℃ and 400rpm for 0.8h, filter the product to obtain the first filter residue, wash until neutral, dry at 90℃ for 3.3h, pulverize, and pass through a 1000-mesh sieve to obtain the filler; Preparation of additive powder: Steel slag and corn cob residue were mixed at a mass ratio of 2:1 and stirred at 1100 rpm for 12 min. The resulting product was pulverized and passed through a 200-mesh sieve to obtain a mixed powder. A composite solution of 190% of its mass was added to the mixed powder and stirred at 52℃ and 225 rpm for 1.3 h. The mixture was filtered to obtain a second filter residue, which was washed, dried at 108℃ for 2.8 h, and then calcined at 625℃ for 1.7 h. After cooling to room temperature, the mixture was ground to obtain the additive powder. The composite solution was prepared by mixing the treatment liquid and the additive at a mass ratio of 3:1 at 175 rpm for 23 min.

[0031] Preparation of the premix: Sodium dodecyl sulfonate was added to deionized water at 43°C and stirred at 165 rpm until completely dissolved. Then, citric acid monohydrate was added and stirred at the original speed for 35 min to obtain the premix. The mass ratio of sodium dodecyl sulfonate, citric acid monohydrate, and deionized water was 1.7:4:100.

[0032] Preparation of the treatment solution: Add dried grape pomace powder that has passed through a 60-mesh sieve to deionized water, stir at 62℃ and 190 rpm for 52 min, filter to obtain the base solution, mix the base solution, aminosulfonic acid and sodium dihydrogen phosphate in a mass ratio of 100:6:2.5, stir to dissolve at 42℃ and 165 rpm to obtain the treatment solution, wherein the amount of dried grape pomace powder added is 11.2% of the mass of deionized water.

[0033] The preparation method of the auxiliary agent includes the following steps: Step A: Add wheat bran and corn cob residue to a sterilized culture medium at a mass ratio of 1:1, and make the moisture content of the culture medium 60%. Inoculate the oyster mushroom spawn into the culture medium and let it stand at 25°C in the dark until the mycelium completely covers the culture medium. Dry the mycelium at 60°C and then crush it through a 40-mesh sieve to obtain the substrate powder. Step B: Add the matrix powder to a 5% ferrous sulfate heptahydrate solution, shake at 35°C and 155 rpm for 2 hours, filter to obtain the third filter residue, and then dry at 60°C for 3 hours to obtain the base material. The matrix powder and ferrous sulfate heptahydrate solution are mixed at a mass ratio of 1:5. Step C: The base material is mixed with a 3% sodium alginate solution. The resulting product is dripped into the composite solution through a dropper. The mixture is left to stand in a coagulation bath for 30 minutes, filtered, and the intermediate solid is collected. The solid is rinsed twice with 1.5 times its mass of deionized water to obtain the additive. The mass ratio of the base material to the sodium alginate solution is 1:3, and the composite solution is obtained by mixing calcium chloride, sodium silicate, and water in a mass ratio of 2:5:92.

[0034] Preparation of additives: Step a: Mix polyvinyl butyral and ethanol at a mass ratio of 1:4.2, and stir at 62℃ and 225 rpm for 2.5 h until completely dissolved to obtain a matrix solution. Add waste glass powder and nano alumina that have passed through a 300-mesh sieve, and mix at 9000 rpm for 38 min to obtain the stock solution. The amount of waste glass powder added is 10% of the mass of the matrix solution, and the amount of nano alumina added is 4% of the mass of the matrix solution. Step b: Inject the stock solution into the electrospinning device and spin under the conditions of a feed rate of 1 mL / h, a voltage of 20 kV, a receiving distance of 16.5 cm, and an ambient humidity of 40%. The receiving roller speed is 900 rpm to obtain a silk film. Step c: Place the silk film at 160℃ for 20 minutes, then cut it into small pieces with a length of 3mm using a pulverizer. This is the additive.

[0035] Preparation of high flexural strength road concrete materials: S1: Weigh out basalt coarse aggregate and medium sand as needed, mix at 125 rpm for 1.5 min, add aluminate cement, filler and additives, adjust the speed to 175 rpm and mix for 2.5 min to obtain the first mixture; S2: Dissolve the polycarboxylate superplasticizer in the mixing water and stir until completely dissolved to obtain the second mixture; S3: Gradually add the second mixture to the first mixture and stir at 225 rpm for 4 minutes to obtain a high flexural strength road concrete material. Example

[0036] A high flexural strength road concrete material, the raw materials of which are composed of the following parts by weight: 100 parts aluminate cement, 8 parts filler, 1.4 parts additive, 400 parts basalt coarse aggregate, 250 parts medium sand, 37 parts mixing water and 0.9 parts polycarboxylate superplasticizer; The fillers include raptor powder, sepiolite powder, premix, and additive powder; Additives include composite solutions, steel slag, and corn cob residue.

[0037] Preparation of filler: Step 1: Mix rapartite powder and sepiolite powder at a mass ratio of 3:1 to obtain mixed mineral powder. Mix the premixed liquid with the mixed mineral powder at a mass ratio of 2.2:1 and stir at 60℃ and 220rpm for 2 hours to obtain a slurry. Step 2: Add 100% of the additive powder by weight to the slurry, stir at 60℃ and 500rpm for 1h, filter the product to obtain the first filter residue, wash until neutral, dry at 100℃ for 3.5h, pulverize, and pass through a 1000-mesh sieve to obtain the filler. Preparation of additive powder: Steel slag and corn cob residue were mixed at a mass ratio of 2:1 and stirred at 1200 rpm for 15 min. The resulting product was pulverized and passed through a 200-mesh sieve to obtain a mixed powder. A composite solution of 200% of its mass was added to the mixed powder and stirred at 55℃ and 250 rpm for 1.5 h. After filtration, a second filter residue was obtained, washed, dried at 110℃ for 3 h, and then calcined at 650℃ for 2 h. After cooling to room temperature, it was ground to obtain the additive powder. The composite solution was prepared by mixing the treatment liquid and the additive at a mass ratio of 3:1 at 200 rpm for 25 min.

[0038] Preparation of the premix: Sodium dodecyl sulfonate was added to deionized water at 45°C and stirred at 180 rpm until completely dissolved. Then, citric acid monohydrate was added and stirred at the original speed for 40 min to obtain the premix. The mass ratio of sodium dodecyl sulfonate, citric acid monohydrate, and deionized water was 2:4.5:100.

[0039] Preparation of the treatment solution: Add dried grape pomace powder that has passed through a 60-mesh sieve to deionized water, stir at 65℃ and 200 rpm for 60 min, filter to obtain the base solution, mix the base solution, aminosulfonic acid and sodium dihydrogen phosphate in a mass ratio of 100:7:3, stir to dissolve at 45℃ and 180 rpm to obtain the treatment solution, wherein the amount of dried grape pomace powder added is 12.5% ​​of the mass of deionized water.

[0040] The preparation method of the auxiliary agent includes the following steps: Step A: Add wheat bran and corn cob residue to a sterilized culture medium at a mass ratio of 1:1, and make the moisture content of the culture medium 60%. Inoculate the oyster mushroom spawn into the culture medium and let it stand at 25°C in the dark until the mycelium completely covers the culture medium. Dry the mycelium at 60°C and then crush it through a 40-mesh sieve to obtain the substrate powder. Step B: Add the matrix powder to a 5% (w / w) ferrous sulfate heptahydrate solution, shake at 35°C and 180 rpm for 2 hours, filter to obtain the third filter residue, and then dry at 60°C for 4 hours to obtain the base material. The matrix powder and ferrous sulfate heptahydrate solution are mixed at a mass ratio of 1:5. Step C: The base material is mixed with a 3% sodium alginate solution. The resulting product is dripped into the composite solution through a dropper. The mixture is left to stand in a coagulation bath for 30 minutes, filtered, and the intermediate solid is collected. The solid is rinsed twice with twice its mass of deionized water to obtain the additive. The mass ratio of the base material to the sodium alginate solution is 1:3, and the composite solution is obtained by mixing calcium chloride, sodium silicate, and water in a mass ratio of 3:6:95.

[0041] Preparation of additives: Step a: Mix polyvinyl butyral and ethanol at a mass ratio of 1:4.5, and stir at 65℃ and 250 rpm for 3 hours until completely dissolved to obtain a matrix solution. Add waste glass powder and nano alumina that have passed through a 300-mesh sieve, and mix at 1000 rpm for 45 minutes to obtain the stock solution. The amount of waste glass powder added is 12% of the mass of the matrix solution, and the amount of nano alumina added is 5% of the mass of the matrix solution. Step b: Inject the stock solution into the electrospinning device and spin the yarn under the conditions of a feed rate of 1.2 mL / h, a voltage of 22 kV, a receiving distance of 18 cm, and an ambient humidity of 45%. The receiving roller rotates at 1000 rpm to obtain a silk film. Step c: Place the silk film at 140℃ for 25 minutes, and then cut it into small pieces with a length of 4mm using a pulverizer. This is the additive.

[0042] Preparation of high flexural strength road concrete materials: S1: Weigh out basalt coarse aggregate and medium sand as needed, mix at 150 rpm for 2 min, add aluminate cement, filler and additives, adjust the speed to 200 rpm and mix for 3 min to obtain the first mixture; S2: Dissolve the polycarboxylate superplasticizer in the mixing water and stir until completely dissolved to obtain the second mixture; S3: Gradually add the second mixture to the first mixture and stir at 250 rpm for 5 minutes to obtain a high flexural strength road concrete material. Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain a composite solution.

[0043] Comparative Example 2 differs from Example 1 in that it does not contain any added powder.

[0044] Comparative Example 3: The difference between this comparative example and Example 1 is that this comparative example does not contain any additives.

[0045] Performance testing: The performance of the high flexural strength road concrete materials treated in Examples 1-3 and Comparative Examples 1-3 was tested, and the test data are recorded in the table below: Table 1 In the performance test, the flexural strength was tested according to GB / T50081-2019. The higher the value, the greater the flexural strength. The abrasion resistance was tested according to GB / T 16925-1997. The shallower the abrasion pit depth, the better. The frost resistance was tested according to GB / T50082-2009. The smaller the loss rate, the better the frost resistance.

[0046] It is evident that the flexural strength, abrasion resistance, and frost resistance of the high-flexural-strength road concrete materials treated in Comparative Examples 1-3 were all lower than those in Examples 1-3. This highlights the importance of additives and additive powders. Comparative Example 1, due to the lack of a composite solution, exhibited significantly inferior performance compared to the other examples. After activation with the composite solution, the secondary hydration reaction capacity of the steel slag was enhanced, enabling it to continuously generate cementitious products that tightly filled the pores of the cement stone. The treated corn cob carbonized skeleton and gel microspheres provided a microporous structure and reinforcing phase. These components, combined with the premixed activated attapulgite and sepiolite minerals, resulted in a final filler that became an organic whole. Without activation with the composite solution, the chemical bonding between the steel slag, corn cob residue, and the cement matrix was weak, leading to poor performance after being incorporated into concrete. The components are simply mixed physically, and the particle surfaces lack nanoscale roughness and micropores, making it impossible to effectively bond with cement hydration products. Furthermore, the low surface activity of the particles prevents them from establishing a strong chemical bond with the cement matrix. As a result, cracks easily propagate within the concrete matrix when subjected to bending stress, significantly reducing flexural strength. Moreover, due to the weak bonding between these unmodified particles and the matrix, the surrounding matrix is ​​prone to peeling off when the surface is subjected to friction, leading to poor wear resistance. In freeze-thaw cycles, the lack of a composite solution means that the potentially unstable components in the steel slag are not stabilized, and the corn cob residue is not converted into biochar with water storage function. The interface between the unmodified particles and the matrix easily becomes the starting point for water accumulation and ice crystal destruction, resulting in a sharp decline in freeze-thaw resistance.

[0047] Comparative Example 2, lacking additive powder in its filler preparation, exhibited significantly lower performance than the Example. The filler was limited to the physical adsorption and intercalation of layered minerals, failing to form a composite matrix with chemical bonding and structural continuity with the cement hydration system. It lacked the continuous secondary hydration products from activated steel slag and the flexible buffering effect of corn cob biochar. Consequently, the matrix's density and toughness were insufficient, its internal homogeneity was poor, and its flexural strength decreased. Furthermore, due to the absence of a dense reinforcing phase composed of biochar micropores and active hydration products on the surface layer, its resistance to stress damage and external wear was weakened. This was particularly evident under the severe test of repeated freeze-thaw cycles, where the strength loss was more pronounced. This indicates that additive powder is a key active component for the synergistic effect of the filler system, solving the problem of limited reinforcing effect of single mineral fillers and difficulty in improving the overall durability of concrete.

[0048] Comparative Example 3, which directly removed the additives, clearly demonstrates that the additives are crucial components in transforming the material from rigid to tough. During stress testing, even with optimized interfaces and a dense matrix achieved through composite solutions and additive powders, the material still experiences brittle fracture after reaching its strength limit due to rapid crack instability and propagation. The dispersed short-cut composite fibers in the additives form a fiber-bridged toughening structure, providing closure stress by bridging the crack surface. This forces the crack to expend additional energy to break the fibers before it can continue propagating. This process increases the toughness of the material. Without this structure, cracks will rapidly develop once they appear, resulting in a sharp drop in flexural strength and brittle fracture characteristics. In terms of wear resistance, the surface and subsurface layers lack the constraint and support of fiber-bridged toughening structures. Under abrasion, the material mainly exhibits brittle spalling, leading to increased wear. Furthermore, under the internal stress generated by freeze-thaw cycles, fibers can bridge and constrain microcracks, preventing them from forming destructive cracks. The fibers themselves and their reinforced interfaces in the additives can hinder the rapid migration and accumulation of moisture, thus improving freeze resistance.

[0049] By comparing and analyzing the relevant data in the table, it can be seen that the high flexural strength road concrete material of the present invention not only has excellent flexural strength but also excellent wear resistance and freeze-thaw resistance. This indicates that the high flexural strength road concrete material provided by the present invention has a broader market prospect and is more suitable for widespread application.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high flexural strength road concrete material, characterized in that, The raw materials consist of the following parts by weight: 100 parts aluminate cement, 6-8 parts filler, 1-1.4 parts additives, 350-400 parts basalt coarse aggregate, 200-250 parts medium sand, 33-37 parts mixing water, and 0.7-0.9 parts polycarboxylate superplasticizer. The filler includes raptosite powder, sepiolite powder, premixed liquid, and additive powder; The additive powder includes a composite solution, steel slag, and corn cob residue.

2. The high flexural strength road concrete material according to claim 1, characterized in that, The method for preparing the filler includes the following steps: Step 1: Mix rapartite powder and sepiolite powder at a mass ratio of 3:1 to obtain mixed mineral powder. Add the premixed liquid and stir at 55-60℃ and 200-220rpm for 1.5-2 hours to obtain a slurry. Step 2: Mix the slurry and the additive powder at a mass ratio of 1:(0.8-1), stir at 300-500 rpm for 0.6-1 h at 55-60℃, filter the product, wash the first filter residue until neutral, dry at 80-100℃ for 3-3.5 h, pulverize and pass through a 1000-mesh sieve to obtain the filler; The amount of premixed liquid added is 200-220% of the mass of the mixed mineral powder.

3. The high flexural strength road concrete material according to claim 2, characterized in that, The preparation method of the additive powder includes the following steps: mixing steel slag and corn cob residue at 1000-1200 rpm for 10-15 min, pulverizing the obtained product, passing it through a 200-mesh sieve to obtain mixed powder, adding a composite solution to the mixed powder, stirring at 50-55℃ and 200-250 rpm for 1.2-1.5 h, filtering to obtain a second filter residue, washing, drying at 105-110℃ for 2.5-3 h, calcining at 600-650℃ for 1.5-2 h, cooling to room temperature, and grinding to obtain the additive powder, wherein the mass ratio of steel slag to corn cob residue is 2:1, and the amount of composite solution used is 180-200% of the mass of the mixed powder.

4. The high flexural strength road concrete material according to claim 2, characterized in that, The preparation method of the premixed solution includes the following steps: heating deionized water to 40-45℃, adding sodium dodecyl sulfonate, mixing at 150-180 rpm, stirring until completely dissolved, adding citric acid monohydrate, and continuing to stir at the original speed for 30-40 min to obtain the premixed solution. The mass ratio of sodium dodecyl sulfonate, citric acid monohydrate, and deionized water is (1.5-2):(3.5-4.5):

100.

5. The high flexural strength road concrete material according to claim 3, characterized in that, The composite solution is prepared by mixing the treatment liquid and the auxiliary agent at a mass ratio of 3:1 at 150-200 rpm for 20-25 min.

6. The high flexural strength road concrete material according to claim 5, characterized in that, The preparation method of the treatment solution includes the following steps: take dried grape pomace, grind it through a 60-mesh sieve, mix the obtained product with deionized water at a mass ratio of 1:(8-10), stir at 60-65℃ and 180-200rpm for 45-60min, filter to obtain a base solution, mix the base solution, aminosulfonic acid and sodium dihydrogen phosphate at a mass ratio of 100:(5-7):(2-3), stir to dissolve at 40-45℃ and 150-180rpm to obtain the treatment solution.

7. The high flexural strength road concrete material according to claim 5, characterized in that, The preparation method of the auxiliary agent includes the following steps: Step A: Inoculate the oyster mushroom spawn into a sterilized culture medium and let it stand at 25°C in the dark until the mycelium completely covers the culture medium. Dry the mycelium at 60°C and then pulverize it through a 40-mesh sieve to obtain the substrate powder. Step B: Mix the matrix powder with ferrous sulfate heptahydrate solution at a mass ratio of 1:5, shake at 35℃ and 130-180 rpm for 2 hours, filter to obtain the third filter residue, and then dry at 60℃ for 2-4 hours to obtain the base material; Step C: Mix the base material and sodium alginate solution at a mass ratio of 1:

3. Add the resulting product to the composite solution through a dropper. Let it stand in the coagulation bath for 30 minutes, filter, collect the intermediate solid, and rinse it twice with 1-2 times its mass of deionized water to obtain the additive. The wheat bran and corn cob residue were mixed in a 1:1 ratio and placed in the culture medium, with a water content of 60%. The ferrous sulfate heptahydrate solution had a mass concentration of 5%, the sodium alginate solution had a mass concentration of 3%, and the composite solution was obtained by mixing calcium chloride, sodium silicate, and water in a mass ratio of (1-3):(4-6):(90-95).

8. The high flexural strength road concrete material according to claim 1, characterized in that, The method for preparing the additive includes the following steps: Step a: Add polyvinyl butyral to ethanol and stir at 60-65℃ and 200-250rpm for 2-3 hours until completely dissolved to obtain a matrix solution. Add waste glass powder and nano alumina that have passed through a 300-mesh sieve and mix at 800-1000rpm for 30-45 minutes to obtain the stock solution. Step b: Inject the stock solution into the electrospinning device and spin under the conditions of a feed rate of 0.8-1.2 mL / h, a voltage of 18-22 kV, a receiving distance of 15-18 cm, and an ambient humidity of 35-45%. The receiving roller speed is 800-1000 rpm to obtain a silk film. Step c: Place the silk film at 120-140℃ for 15-25 minutes, and then cut it into small pieces with a length of 2-4mm using a pulverizer. This is the additive.

9. The high flexural strength road concrete material according to claim 8, characterized in that, The mass ratio of polyvinyl butyral to ethanol is 1:(4-4.5), and the mass ratio of matrix solution, waste glass powder and nano alumina is 1:(0.08-0.12):(0.03-0.05).

10. The method for preparing high flexural strength road concrete material according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Weigh out basalt coarse aggregate and medium sand as needed, dry mix at 100-150 rpm for 1-2 minutes, add aluminate cement, filler and additives, adjust the speed to 150-200 rpm and mix for 2-3 minutes to obtain the first mixture; S2: Dissolve the polycarboxylate superplasticizer in the mixing water and stir until completely dissolved to obtain the second mixture; S3: Gradually add the second mixture to the first mixture and stir at 200-250 rpm for 3-5 minutes to obtain high flexural strength road concrete material.

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