Anti-rutting asphalt mixture and preparation method thereof

Abstract

The invention relates to the field of asphalt mixtures, in particular to an anti-rutting asphalt mixture and a preparation method thereof, which are used for solving the problems that the existing asphalt mixture is poor in rutting resistance and low-temperature crack resistance, and the driving safety, comfort and service life of a pavement are seriously influenced. According to the preparation method, by adding the coated basalt fiber and the organic silicon grafted epoxy resin into the asphalt mixture, a highly crosslinked network structure can be formed in the asphalt mixture, and the asphalt mixture has very high mechanical strength and toughness, so that the rutting resistance of the asphalt mixture can be remarkably improved, and the low-temperature crack resistance of the asphalt mixture is synchronously and remarkably improved. Therefore, the fatigue damage of the road surface can be effectively reduced, the service life of the road can be prolonged, the driving comfort can be improved, and the use quality and safety of the road surface can be optimized on the road sections with frequent traffic, such as expressways and main roads.

Description

Technical Field

[0001] This invention relates to the field of asphalt mixtures, and more specifically to a rutting-resistant asphalt mixture and its preparation method. Background Technology

[0002] Asphalt mixtures, with their advantages of smooth surface, comfortable driving, convenient construction, and good noise reduction, have become the core material for various road surface layers. However, with the rapid development of my country's transportation industry, traffic flow on highways and urban arterial roads has increased significantly, and the proportion of heavy-duty vehicles has continued to rise. Coupled with complex climatic conditions such as high temperatures in summer, severe cold in winter, and heavy rainfall in the rainy season, asphalt mixture pavements are prone to rutting. Furthermore, asphalt mixtures are susceptible to cracking after being frozen at low temperatures, seriously affecting road safety, comfort, and service life. This also significantly increases road maintenance costs and restricts the long-term service life of road projects.

[0003] Therefore, developing a rutting-resistant asphalt mixture and its preparation method is of great practical significance. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the present invention aims to provide a rutting-resistant asphalt mixture and its preparation method, which solves the problem that the existing asphalt mixtures have poor rutting resistance and low-temperature crack resistance, which seriously affect the road driving safety, comfort and service life.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, this application provides a rutting-resistant asphalt mixture, comprising the following components in parts by weight: 90-95 parts aggregate, 4.5-7.5 parts asphalt, 2-3 parts cement, 0.5-2.5 parts coated basalt fiber, and 0.3-1.1 parts organosilicon-grafted epoxy resin; The organosilicon-grafted epoxy resin is prepared by the following steps: Step a1: Add phenyltrimethoxysilane, anhydrous oxalic acid, and deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 10-20 min at 20-25℃ and 200-300 r / min. Then, raise the temperature to 50-60℃ and continue stirring for 5-6 h. Next, add dimethyldimethoxysilane and dibutyltin dilaurate and raise the temperature to 90-100℃ and continue stirring for 3-5 h. After the reaction is complete, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain the reactive silicone resin. Step a2: Add reactive silicone resin, epoxy resin and xylene to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube, purge with nitrogen for protection, and stir for 10-20 min at a temperature of 20-25℃ and a stirring rate of 200-300 r / min. Then raise the temperature to 120-130℃ and continue stirring for 5-6 h. After the reaction is completed, cool the reaction product to room temperature, and then remove the solvent by rotary evaporation to obtain organosilicon-grafted epoxy resin.

[0006] In a preferred embodiment of the present invention, the ratio of phenyltrimethoxysilane, anhydrous oxalic acid, deionized water, dimethyldimethoxysilane and dibutyltin dilaurate in step a1 is 0.1mol:0.05-0.07g:2-3mL:0.05mol:0.2-0.3g.

[0007] In a preferred embodiment of the present invention, the ratio of reactive silicone resin, epoxy resin and xylene in step a2 is 1-11g:40g:8-10mL.

[0008] In a preferred embodiment of the present invention, the epoxy resin in step a2 is E-51.

[0009] In a preferred embodiment of the present invention, the basalt-coated fiber is prepared by the following steps: Step b1: Add basalt fiber and acetone to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection. Stir and react for 10-20 min at a temperature of 20-25℃ and a stirring rate of 200-300 r / min. Then raise the temperature to 60-70℃ and continue stirring for 3-5 h. After the reaction is complete, cool the reaction product to room temperature and then filter under vacuum. Wash the filter cake 2-3 times with ethanol and distilled water. Then place it in a vacuum drying oven and dry at a temperature of 70-80℃ for 2-3 h to obtain pretreated basalt fiber. Step b2: Add tris(hydroxymethyl)aminomethane and deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 10-20 min at a temperature of 20-25℃ and a stirring rate of 200-300 r / min. Then adjust the pH to 8.5 with hydrochloric acid solution. Add pretreated basalt fibers and continue stirring for 1-2 h. Add dopamine hydrochloride and continue stirring for 20-30 h. After the reaction is complete, vacuum filter the reaction product. Wash the filter cake 2-3 times with ethanol and distilled water. Then place it in a vacuum drying oven and dry at a temperature of 40-50℃ for 3-4 h to obtain coated basalt fibers.

[0010] In a preferred embodiment of the present invention, the ratio of basalt fiber to acetone in step b1 is 3g:50-60mL.

[0011] In a preferred embodiment of the present invention, the basalt fibers in step b1 have an average length of 12 mm and an average diameter of 17 μm.

[0012] In a preferred embodiment of the present invention, the ratio of tris(hydroxymethyl)aminomethane, deionized water, pretreated basalt fiber and dopamine hydrochloride in step b2 is 0.484g:300mL:10g:0.8-2.4g.

[0013] In a preferred embodiment of the present invention, the molar concentration of the hydrochloric acid solution in step b2 is 0.1 mol / L.

[0014] Secondly, this application provides a method for preparing rutting-resistant asphalt mixture, comprising the following steps: Step 1: Weigh out 90-95 parts of aggregate, 4.5-7.5 parts of asphalt, 2-3 parts of cement, 0.5-2.5 parts of basalt fiber coating, and 0.3-1.1 parts of silicone-grafted epoxy resin according to the weight ratio, and set aside. Step 2: Place the aggregate in an oven and preheat it at 160-170℃ for 30-40 minutes. Add the asphalt to the mixer and shear it at 160-170℃ and a stirring speed of 3000-4000 r / min for 30-50 minutes. Then add the preheated aggregate, cement, coated basalt fiber, and organosilicon-grafted epoxy resin to the mixer and continue shearing for 3-5 minutes to obtain rutting-resistant asphalt mixture.

[0015] In a preferred embodiment of the present invention, the aggregate is a mixture of limestone crushed stone with an average particle size of 5 mm, limestone crushed stone with an average particle size of 1 mm, and limestone powder with an average particle size of 0.005 mm in a mass ratio of 3.5-4:2.7-3.1:1.1-1.3.

[0016] In a preferred embodiment of the present invention, the asphalt is AH-90 asphalt.

[0017] In a preferred embodiment of the present invention, the cement is P·O42.5 ordinary Portland cement.

[0018] The beneficial effects of this invention are: This invention discloses an anti-rutting asphalt mixture and its preparation method. The method involves preheating aggregates, adding asphalt to a mixer for shearing, and then adding the preheated aggregates, cement, basalt-coated fibers, and silicone-grafted epoxy resin to the mixer for further shearing to obtain the anti-rutting asphalt mixture. This preparation method, by adding basalt-coated fibers and silicone-grafted epoxy resin to the asphalt mixture, forms a highly cross-linked network structure within it, exhibiting high mechanical strength and toughness. This significantly improves the rutting resistance of the asphalt mixture, and its low-temperature crack resistance is also significantly enhanced. This means that on high-traffic sections, such as highways and main roads, it can effectively reduce road fatigue damage, extend road service life and improve driving comfort, thereby optimizing the road surface quality and safety. In the preparation of rutting-resistant asphalt mixtures, a basalt fiber coating was first prepared. Acetone was used to treat the basalt fiber, effectively removing surface impurities to obtain pretreated basalt fiber. Then, dopamine hydrochloride was used as a monomer to coat the surface of the pretreated basalt fiber, forming polydopamine, resulting in coated basalt fiber. Basalt fiber itself possesses advantages such as high strength, high elastic modulus, and high temperature resistance, which can disperse traffic loads, resist shear stress and slippage of aggregates, and inhibit plastic deformation. After polydopamine coating modification, a dense and stable polydopamine coating layer can be formed on its surface, effectively improving the compatibility between basalt fiber and asphalt, preventing agglomeration. Furthermore, the excellent adhesive properties of polydopamine itself can enhance the interfacial bonding force. Simultaneously, the active groups on polydopamine can react with the epoxy groups on organosilicon-grafted epoxy resin to form strong chemical bonds, further enhancing the interfacial bonding force. This fully leverages the performance enhancement effect of the asphalt mixture, significantly improving its rutting resistance. In the process of preparing rutting-resistant asphalt mixtures, an organosilicon-grafted epoxy resin was also prepared. Using phenyltrimethoxysilane as a monomer and oxalic acid as a catalyst, a phenyl silicone resin prepolymer containing silanol reactive groups was synthesized through a hydrolysis-condensation reaction. Then, under the catalysis of dibutyltin dilaurate, the methoxy groups on the molecular structure of dimethyldimethoxysilane condensed with the silanol groups on the phenyl silicone resin prepolymer, yielding a reactive silicone resin containing methoxy active groups. The methoxy groups on the reactive silicone resin condensed with the hydroxyl groups on the epoxy resin to obtain the organosilicon-grafted epoxy resin. This organosilicon-grafted epoxy resin contains a large number of epoxy groups, which can form a stable cross-linked structure with asphalt. Simultaneously, it chemically combines with the functional groups on the surface of polydopamine-coated basalt fibers. The two synergistically construct a three-dimensional network reinforcement structure, further constraining the flow of asphalt molecules and aggregate slippage, significantly improving the high-temperature rutting resistance of the asphalt mixture, while also improving the low-temperature toughness of the mixture, preventing winter cracking, and enhancing the durability of the mixture. Detailed Implementation

[0019] 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.

[0020] Example 1: This example describes a method for preparing rutting-resistant asphalt mixture, including the following steps: Step S1: Add 0.1 mol phenyltrimethoxysilane, 0.05 g anhydrous oxalic acid and 2 mL deionized water to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 20 °C and 200 r / min for 10 min. Then raise the temperature to 50 °C and continue stirring for 5 h. Then add 0.05 mol dimethyldimethoxysilane and 0.2 g dibutyltin dilaurate and raise the temperature to 90 °C and continue stirring for 3 h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain reactive silicone resin. Step S2: Add 1g of reactive silicone resin, 40g of epoxy resin E-51 and 8mL of xylene to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 20℃ and 200r / min for 10min. Then raise the temperature to 120℃ and continue stirring for 5h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain organosilicon grafted epoxy resin. Step S3: Add 3g of basalt fiber with an average length of 12mm and an average diameter of 17μm and 50mL of acetone to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 20℃ and 200r / min for 10min. Then raise the temperature to 60℃ and continue stirring for 3h. After the reaction is complete, cool the reaction product to room temperature and then filter under vacuum. Wash the filter cake twice with ethanol and distilled water, and then place it in a vacuum drying oven and dry at 70℃ for 2h to obtain pretreated basalt fiber. Step S4: Add 0.484g of tris(hydroxymethyl)aminomethane and 300mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 10min at 20℃ and 200r / min. Then adjust the pH to 8.5 with 0.1mol / L hydrochloric acid solution. Add 10g of pretreated basalt fiber and continue stirring for 1h. Then add 0.8g of dopamine hydrochloride and continue stirring for 20h. After the reaction is complete, vacuum filter the reaction product. Wash the filter cake twice with ethanol and distilled water. Then place it in a vacuum drying oven and dry at 40℃ for 3h to obtain coated basalt fiber. Step S5: Weigh out 90 parts of aggregate, 4.5 parts of asphalt, 2 parts of cement, 0.5 parts of basalt fiber coating, and 0.3 parts of organosilicon-grafted epoxy resin according to the following weight proportions, and set aside; the aggregate is a mixture of limestone crushed stone with an average particle size of 5mm, limestone crushed stone with an average particle size of 1mm, and limestone powder with an average particle size of 0.005mm in a mass ratio of 3.5:2.7:1.1; the asphalt is AH-90 asphalt; the cement is P·O42.5 ordinary Portland cement; Step S6: Place the aggregate in an oven and preheat it at 160℃ for 30 minutes. Add the asphalt to the mixer and shear it at 160℃ and a stirring rate of 3000 r / min for 30 minutes. Then add the preheated aggregate, cement, coated basalt fiber and organosilicon-grafted epoxy resin to the mixer and continue shearing for 3 minutes to obtain rutting-resistant asphalt mixture.

[0021] Example 2: This example describes a method for preparing rutting-resistant asphalt mixture, including the following steps: Step S1: 0.1 mol phenyltrimethoxysilane, 0.06 g anhydrous oxalic acid and 2.5 mL deionized water were added to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Nitrogen gas was introduced for protection. The mixture was stirred at 22 °C and 250 r / min for 15 min. Then the temperature was raised to 55 °C and the mixture was stirred for 5.5 h. Then 0.05 mol dimethyldimethoxysilane and 0.25 g dibutyltin dilaurate were added and the temperature was raised to 95 °C and the mixture was stirred for 4 h. After the reaction was completed, the reaction product was cooled to room temperature and the solvent was removed by rotary evaporation to obtain reactive silicone resin. Step S2: Add 6g of reactive silicone resin, 40g of epoxy resin E-51 and 9mL of xylene to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 22℃ and 250r / min for 15min. Then raise the temperature to 125℃ and continue stirring for 5.5h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain organosilicon grafted epoxy resin. Step S3: Add 3g of basalt fiber with an average length of 12mm and an average diameter of 17μm and 55mL of acetone to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 22℃ and 250r / min for 15min. Then raise the temperature to 65℃ and continue stirring for 4h. After the reaction is complete, cool the reaction product to room temperature and then filter under vacuum. Wash the filter cake twice with ethanol and distilled water, and then place it in a vacuum drying oven and dry at 75℃ for 2.5h to obtain pretreated basalt fiber. Step S4: Add 0.484g of tris(hydroxymethyl)aminomethane and 300mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 15min at 22℃ and 250r / min. Then adjust the pH to 8.5 with 0.1mol / L hydrochloric acid solution. Add 10g of pretreated basalt fiber and continue stirring for 1.5h. Add 1.6g of dopamine hydrochloride and continue stirring for 25h. After the reaction is complete, vacuum filter the reaction product. Wash the filter cake twice with ethanol and distilled water. Then place it in a vacuum drying oven and dry at 45℃ for 3.5h to obtain coated basalt fiber. Step S5: Weigh out 92 parts of aggregate, 6 parts of asphalt, 2.5 parts of cement, 1.5 parts of basalt fiber coating, and 0.7 parts of organosilicon-grafted epoxy resin according to the following weight proportions, and set aside; the aggregate is a mixture of limestone crushed stone with an average particle size of 5mm, limestone crushed stone with an average particle size of 1mm, and limestone powder with an average particle size of 0.005mm in a mass ratio of 3.8:2.9:1.2; the asphalt is AH-90 asphalt; the cement is P·O42.5 ordinary Portland cement; Step S6: Place the aggregate in an oven and preheat it at 165℃ for 35 minutes. Add the asphalt to the mixer and shear it at 165℃ and a stirring rate of 3500 r / min for 40 minutes. Then add the preheated aggregate, cement, coated basalt fiber and organosilicon-grafted epoxy resin to the mixer and continue shearing for 4 minutes to obtain rutting-resistant asphalt mixture.

[0022] Example 3: This example describes a method for preparing rutting-resistant asphalt mixture, comprising the following steps: Step S1: Add 0.1 mol phenyltrimethoxysilane, 0.07 g anhydrous oxalic acid and 3 mL deionized water to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25 °C and 300 r / min for 20 min. Then raise the temperature to 60 °C and continue stirring for 6 h. Then add 0.05 mol dimethyldimethoxysilane and 0.3 g dibutyltin dilaurate and raise the temperature to 100 °C and continue stirring for 5 h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain reactive silicone resin. Step S2: Add 11g of reactive silicone resin, 40g of epoxy resin E-51 and 10mL of xylene to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25℃ and 300r / min for 20min. Then raise the temperature to 130℃ and continue stirring for 6h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain organosilicon grafted epoxy resin. Step S3: Add 3g of basalt fiber with an average length of 12mm and an average diameter of 17μm and 60mL of acetone to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25℃ and 300r / min for 20min. Then raise the temperature to 70℃ and continue stirring for 5h. After the reaction is completed, cool the reaction product to room temperature and then filter under vacuum. Wash the filter cake three times with ethanol and distilled water, and then place it in a vacuum drying oven and dry at 80℃ for 3h to obtain pretreated basalt fiber. Step S4: Add 0.484g of tris(hydroxymethyl)aminomethane and 300mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 20min at 25℃ and 300r / min. Then adjust the pH to 8.5 with 0.1mol / L hydrochloric acid solution. Add 10g of pretreated basalt fiber and continue stirring for 2h. Then add 2.4g of dopamine hydrochloride and continue stirring for 30h. After the reaction is complete, vacuum filter the reaction product. Wash the filter cake three times with ethanol and distilled water. Then place it in a vacuum drying oven and dry at 50℃ for 4h to obtain coated basalt fiber. Step S5: Weigh out 95 parts of aggregate, 7.5 parts of asphalt, 3 parts of cement, 2.5 parts of basalt fiber coating, and 1.1 parts of organosilicon-grafted epoxy resin according to the following weight proportions, and set aside; the aggregate is a mixture of limestone crushed stone with an average particle size of 5mm, limestone crushed stone with an average particle size of 1mm, and limestone powder with an average particle size of 0.005mm in a mass ratio of 4:3.1:1.3; the asphalt is AH-90 asphalt; the cement is P·O42.5 ordinary Portland cement; Step S6: Place the aggregate in an oven and preheat it at 170℃ for 40 minutes. Add the asphalt to the mixer and shear it at 170℃ and a stirring rate of 4000 r / min for 50 minutes. Then add the preheated aggregate, cement, coated basalt fiber and organosilicon-grafted epoxy resin to the mixer and continue shearing for 5 minutes to obtain rutting-resistant asphalt mixture.

[0023] Comparative Example 1: This comparative example illustrates a method for preparing rutting-resistant asphalt mixtures, comprising the following steps: Step S1: Weigh out 95 parts of aggregate, 7.5 parts of asphalt, and 3 parts of cement by weight, and set aside. The aggregate is a mixture of limestone crushed stone with an average particle size of 5 mm, limestone crushed stone with an average particle size of 1 mm, and limestone powder with an average particle size of 0.005 mm in a mass ratio of 4:3.1:1.3. The asphalt is AH-90 asphalt. The cement is P·O42.5 ordinary Portland cement. Step S6: Place the aggregate in an oven and preheat it at 170℃ for 40 minutes. Add the asphalt to the mixer and shear it at 170℃ and a stirring rate of 4000 r / min for 50 minutes. Then add the preheated aggregate and cement to the mixer and continue shearing for 5 minutes to obtain the rutting-resistant asphalt mixture.

[0024] Comparative Example 2: This comparative example illustrates a method for preparing rutting-resistant asphalt mixtures, comprising the following steps: Step S1: Add 0.1 mol phenyltrimethoxysilane, 0.07 g anhydrous oxalic acid and 3 mL deionized water to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25 °C and 300 r / min for 20 min. Then raise the temperature to 60 °C and continue stirring for 6 h. Then add 0.05 mol dimethyldimethoxysilane and 0.3 g dibutyltin dilaurate and raise the temperature to 100 °C and continue stirring for 5 h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain reactive silicone resin. Step S2: Add 11g of reactive silicone resin, 40g of epoxy resin E-51 and 10mL of xylene to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25℃ and 300r / min for 20min. Then raise the temperature to 130℃ and continue stirring for 6h. After the reaction is completed, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain organosilicon grafted epoxy resin. Step S3: Weigh out 95 parts of aggregate, 7.5 parts of asphalt, 3 parts of cement, and 1.1 parts of organosilicon-grafted epoxy resin according to the following weight proportions, and set aside; the aggregate is a mixture of limestone crushed stone with an average particle size of 5mm, limestone crushed stone with an average particle size of 1mm, and limestone powder with an average particle size of 0.005mm in a mass ratio of 4:3.1:1.3; the asphalt is AH-90 asphalt; the cement is P·O42.5 ordinary Portland cement; Step S4: Place the aggregate in an oven and preheat it at 170℃ for 40 minutes. Add the asphalt to the mixer and shear it at 170℃ and a stirring rate of 4000 r / min for 50 minutes. Then add the preheated aggregate, cement, and organosilicon-grafted epoxy resin to the mixer and continue shearing for 5 minutes to obtain rutting-resistant asphalt mixture.

[0025] Comparative Example 3: This comparative example illustrates a method for preparing rutting-resistant asphalt mixtures, comprising the following steps: Step S1: Add 3g of basalt fiber with an average length of 12mm and an average diameter of 17μm and 60mL of acetone to a three-necked flask equipped with a stirrer, thermometer and gas delivery tube. Purge with nitrogen for protection and stir at 25℃ and 300r / min for 20min. Then raise the temperature to 70℃ and continue stirring for 5h. After the reaction is completed, cool the reaction product to room temperature and then filter under vacuum. Wash the filter cake three times with ethanol and distilled water, and then place it in a vacuum drying oven and dry at 80℃ for 3h to obtain pretreated basalt fiber. Step S2: Add 0.484g of tris(hydroxymethyl)aminomethane and 300mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir for 20min at 25℃ and 300r / min. Then adjust the pH to 8.5 with 0.1mol / L hydrochloric acid solution. Add 10g of pretreated basalt fiber and continue stirring for 2h. Then add 2.4g of dopamine hydrochloride and continue stirring for 30h. After the reaction is complete, vacuum filter the reaction product. Wash the filter cake three times with ethanol and distilled water. Then place it in a vacuum drying oven and dry at 50℃ for 4h to obtain coated basalt fiber. Step S3: Weigh out 95 parts of aggregate, 7.5 parts of asphalt, 3 parts of cement, and 2.5 parts of basalt fiber coating according to weight, and set aside; the aggregate is a mixture of limestone crushed stone with an average particle size of 5mm, limestone crushed stone with an average particle size of 1mm, and limestone powder with an average particle size of 0.005mm in a mass ratio of 4:3.1:1.3; the asphalt is AH-90 asphalt; the cement is P·O42.5 ordinary Portland cement; Step S4: Place the aggregate in an oven and preheat it at 170℃ for 40 minutes. Add the asphalt to the mixer and shear it at 170℃ and a stirring rate of 4000 r / min for 50 minutes. Then add the preheated aggregate, cement, and basalt fiber coating to the mixer and continue shearing for 5 minutes to obtain rutting-resistant asphalt mixture.

[0026] Comparative Example 4: This comparative example illustrates a method for preparing rutting-resistant asphalt mixtures, comprising the following steps: Step S1: Weigh out 95 parts of aggregate, 7.5 parts of asphalt, 3 parts of cement, 2.5 parts of basalt fiber, and 1.1 parts of epoxy resin according to weight, and set aside. The aggregate is a mixture of limestone crushed stone with an average particle size of 5 mm, limestone crushed stone with an average particle size of 1 mm, and limestone powder with an average particle size of 0.005 mm in a mass ratio of 4:3.1:1.3. The asphalt is AH-90 asphalt. The cement is P·O42.5 ordinary Portland cement. The basalt fiber has an average length of 12 mm and an average diameter of 17 μm. The epoxy resin is E-51. Step S2: Place the aggregate in an oven and preheat it at 170℃ for 40 minutes. Add the asphalt to the mixer and shear it at 170℃ and a stirring rate of 4000 r / min for 50 minutes. Then add the preheated aggregate, cement, basalt fiber and epoxy resin to the mixer and continue shearing for 5 minutes to obtain rutting-resistant asphalt mixture.

[0027] The rutting-resistant asphalt mixtures of Examples 1-3 and Comparative Examples 1-4 were subjected to high-temperature rutting tests and low-temperature bending tests. The specific method of the high-temperature rutting test is as follows: the specimens were kept in a constant temperature chamber at (60±1)℃ for 6 hours, and then their rutting resistance was tested using a rutting testing machine until the maximum deformation reached 25 mm. During the test, the dynamic stability (DS value) of the specimens was analyzed based on the permanent deformation after 45-60 minutes of load application. The specific method of the low-temperature bending test is as follows: an MTS testing machine was used, the loading rate was set to 50 mm / min and the test temperature was kept at -10℃. The low-temperature bending strain and bending stiffness modulus were measured to evaluate the low-temperature crack resistance.

[0028] The test results are shown in the table below:

[0029] Referring to the data in the table above, and based on the comparison between Examples 1-3 and Comparative Examples 1-4, it can be seen that the rutting-resistant asphalt mixture of this application has excellent rutting resistance and low-temperature crack resistance.

[0030] 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.

[0031] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in this application, they should all fall within the protection scope of the present invention.

Claims

1. A rutting-resistant asphalt mixture, characterized in that, Includes the following components by weight: 90-95 parts aggregate, 4.5-7.5 parts asphalt, 2-3 parts cement, 0.5-2.5 parts coated basalt fiber, and 0.3-1.1 parts organosilicon-grafted epoxy resin; The organosilicon-grafted epoxy resin is prepared by the following steps: Step a1: Phenylacetyltrimethoxysilane, anhydrous oxalic acid and deionized water are stirred and reacted. Then dimethyldimethoxysilane and dibutyltin dilaurate are added and the reaction is continued. After the reaction is completed, the reaction product is cooled and then rotary evaporated to obtain reactive silicone resin. Step a2: The reactive silicone resin, epoxy resin and xylene are stirred and reacted. After the reaction is completed, the reaction product is cooled and then evaporated by rotary evaporation to obtain organosilicon-grafted epoxy resin.

2. The rutting-resistant asphalt mixture according to claim 1, characterized in that, The ratio of phenyltrimethoxysilane, anhydrous oxalic acid, deionized water, dimethyldimethoxysilane and dibutyltin dilaurate used in step a1 is 0.1 mol: 0.05-0.07 g: 2-3 mL: 0.05 mol: 0.2-0.3 g.

3. The rutting-resistant asphalt mixture according to claim 1, characterized in that, The ratio of reactive silicone resin, epoxy resin, and xylene used in step a2 is 1-11g:40g:8-10mL; the epoxy resin is E-51.

4. The rutting-resistant asphalt mixture according to claim 1, characterized in that, The coated basalt fibers are prepared by the following steps: Step b1: Basalt fiber and acetone are stirred and reacted. After the reaction is completed, the reaction product is cooled and then vacuum filtered. The filter cake is washed and dried to obtain pretreated basalt fiber. Step b2: Tris(hydroxymethyl)aminomethane and deionized water are stirred and reacted. Then, the pH is adjusted with hydrochloric acid solution. Then, pretreated basalt fibers and dopamine hydrochloride are added and the reaction is continued with stirring. After the reaction is completed, the reaction product is vacuum filtered. The filter cake is washed and dried to obtain coated basalt fibers.

5. The rutting-resistant asphalt mixture according to claim 4, characterized in that, In step b1, the ratio of basalt fiber to acetone is 3g:50-60mL; the average length of the basalt fiber is 12mm and the average diameter is 17μm.

6. The rutting-resistant asphalt mixture according to claim 4, characterized in that, In step b2, the ratio of tris(hydroxymethyl)aminomethane, deionized water, pretreated basalt fiber, and dopamine hydrochloride is 0.484 g: 300 mL: 10 g: 0.8-2.4 g; the molar concentration of the hydrochloric acid solution is 0.1 mol / L.

7. A method for preparing rutting-resistant asphalt mixture, characterized in that, The preparation of the rutting-resistant asphalt mixture as described in any one of claims 1-6 includes the following steps: Step 1: Weigh out 90-95 parts of aggregate, 4.5-7.5 parts of asphalt, 2-3 parts of cement, 0.5-2.5 parts of basalt fiber coating, and 0.3-1.1 parts of silicone-grafted epoxy resin according to the weight ratio, and set aside. Step 2: Place the aggregate in an oven and preheat it at 160-170℃ for 30-40 minutes. Add the asphalt to the mixer and shear it at 160-170℃ and a stirring speed of 3000-4000 r / min for 30-50 minutes. Then add the preheated aggregate, cement, coated basalt fiber, and organosilicon-grafted epoxy resin to the mixer and continue shearing for 3-5 minutes to obtain rutting-resistant asphalt mixture.

8. The method for preparing a rutting-resistant asphalt mixture according to claim 7, characterized in that, The aggregate is a mixture of limestone crushed stone with an average particle size of 5 mm, limestone crushed stone with an average particle size of 1 mm, and limestone powder with an average particle size of 0.005 mm in a mass ratio of 3.5-4:2.7-3.1:1.1-1.

3.

9. The method for preparing a rutting-resistant asphalt mixture according to claim 7, characterized in that, The asphalt is AH-90 asphalt.

10. The method for preparing a rutting-resistant asphalt mixture according to claim 7, characterized in that, The cement is P·O42.5 ordinary Portland cement.

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