CN111908835A - Anti-cracking basalt fiber asphalt mixture and preparation method thereof - Google Patents
Anti-cracking basalt fiber asphalt mixture and preparation method thereof Download PDFInfo
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- CN111908835A CN111908835A CN202010809369.2A CN202010809369A CN111908835A CN 111908835 A CN111908835 A CN 111908835A CN 202010809369 A CN202010809369 A CN 202010809369A CN 111908835 A CN111908835 A CN 111908835A
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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Abstract
The invention relates to the technical field of asphalt, and discloses an anti-cracking basalt fiber asphalt mixture and a preparation method thereof. Comprises the following components in percentage by mass: 4.2-4.6% of SBS modified asphalt, 0.26-0.43% of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, and the mineral powder accounts for 1.5-3.0% of the mass of the mineral aggregate; heating SBS modified asphalt to 165-175 ℃ to a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to dry to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 2-5min at 160-170 ℃ to obtain the SBS modified asphalt. The modified basalt fiber is doped into the SBS modified asphalt mixture, and the modified basalt fiber and the SBS modified asphalt have good adhesive property, so that the anti-cracking property of the asphalt mixture is improved.
Description
Technical Field
The invention relates to the technical field of asphalt, in particular to an anti-cracking basalt fiber asphalt mixture and a preparation method thereof.
Background
The early damage of the asphalt pavement is serious and the long-term service performance of the asphalt pavement is influenced by the factors of rapid increase of modern traffic flow, great increase of truck axle load, traffic channeling running, natural climate change and the like. The low-temperature cracking causes one of the common diseases of the asphalt pavement, and the low-temperature performance of the asphalt cement and the asphalt mixture is an important factor influencing the low-temperature cracking of the asphalt pavement. Basalt Fiber (BF) is known as a new material in the 21 st century, has no pollution in the production process, and is continuous mineral fiber formed by melting crushed natural basalt in a 1450-1500 ℃ high-temperature melting furnace and then quickly drawing and coating a surface sizing agent. The basalt fiber has the advantages of high strength, good acid and alkali resistance, high temperature resistance, dispersibility, health and harmlessness. After the basalt fiber is applied to the asphalt mixture, the high-temperature rutting resistance, the low-temperature cracking resistance, the freeze-thaw resistance and the fatigue resistance of the material are improved to a certain degree, and especially the material shows incomparable fatigue resistance under heavy load and high temperature environments, and in addition, the regeneration performance of the material enables the basalt fiber to replace other types of fibers and have wide prospects when being applied to the asphalt mixture.
Chinese patent publication No. CN105819751 discloses a preparation method of a compound modified asphalt mixture with fatigue cracking resistance, which comprises the steps of heating road oil asphalt, uniformly adding rubber powder and SBS modifier, carrying out high-speed rotary stirring, shearing emulsification, standing for swelling to obtain rubber powder/SBS modified asphalt, and mixing the rubber powder/SBS modified asphalt with mineral aggregate and basalt fiber to support the compound modified asphalt mixture doped with rubber powder/SBS; for another example, chinese patent publication No. CN107759139 discloses a high fatigue-resistant and crack-resistant permeable asphalt mixture and a preparation method thereof, the composition of the mixture is: the SBS modified asphalt, the chopped basalt fiber, the mineral aggregate and the HVA high-viscosity agent are melted in an oven. Then, preheating the mineral aggregate and the aggregate, and finally adding the coarse and fine aggregate, the chopped basalt fiber, the HVA high-viscosity agent, the SBS modified asphalt and the mineral powder into a mixing pot in sequence for uniformly mixing to obtain an asphalt mixture; further, as disclosed in chinese patent publication No. CN105859191, a composite modified asphalt mixture with high fatigue cracking resistance comprises the following components: the road petroleum asphalt, rubber powder, an SBS modifier, basalt fibers and mineral aggregate, wherein the rubber powder is used for replacing part of the SBS modifier, and the fatigue cracking resistance of the mixture is greatly improved by doping the basalt fibers. In the patent documents, the basalt fiber is doped into the SBS modified asphalt mixture to improve the fatigue cracking resistance of the asphalt mixture, but because the basalt fiber is an inorganic material, the SBS modified asphalt is an organic material, and the surface of the basalt fiber is smooth, the adhesive property between the basalt fiber and the SBS modified asphalt is poor, so that the improvement of the cracking resistance of the basalt fiber to the asphalt mixture is influenced.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides an anti-cracking basalt fiber asphalt mixture. The modified basalt fiber is doped into the SBS modified asphalt mixture, and the modified basalt fiber and the SBS modified asphalt have good adhesive property, so that the anti-cracking property of the asphalt mixture is improved.
The invention also provides a preparation method of the anti-cracking basalt fiber asphalt mixture.
In order to achieve the purpose, the invention adopts the following technical scheme: the anti-cracking basalt fiber asphalt mixture comprises the following components in percentage by mass: 4.2-4.6% of SBS modified asphalt, 0.26-0.43% of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, and the mineral powder accounts for 1.5-3.0% of the mass of the mineral aggregate.
Preferably, the aggregate is basalt; the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the grain diameter of the No. 1 material is 14-18mm, the grain diameter of the No. 2 material is 8-12mm, the grain diameter of the No. 3 material is 5-7mm, and the grain diameter of the No. 4 material is 1-3 mm.
Preferably, the material No. 1 accounts for 35-45% of the weight of the aggregate, the material No. 2 accounts for 25-30% of the weight of the aggregate, the material No. 3 accounts for 10-20% of the weight of the aggregate, and the balance is the material No. 4.
Preferably, the mineral powder is limestone with the particle size of less than 0.075 mm.
Preferably, the preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent into deionized water, stirring and mixing uniformly, dropwise adding a hydrochloric acid solution to adjust the pH of the system to 3-5, heating in a water bath to 50-60 ℃, stirring and reacting for 1-2h, filtering, washing and drying to obtain alkylated modified basalt fiber; adding the alkylated modified basalt fiber into a carboxymethyl chitosan aqueous solution, then adding a stannic chloride catalyst, heating in a water bath to 75-85 ℃, stirring for reaction for 2-5h, then adding the hollow mesoporous silica microspheres, stirring and mixing uniformly, standing for 10-15h, filtering, separating, washing and drying to obtain the modified basalt fiber.
According to the invention, an epoxy silane coupling agent is adopted to carry out surface modification treatment on basalt fibers, the epoxy silane coupling agent is grafted to the surfaces of the basalt fibers, so that epoxy groups are loaded on the surfaces of the basalt fibers, then, the epoxy groups loaded on the surfaces of the basalt fibers and hydroxyl groups on carboxymethyl chitosan molecules are subjected to an open-loop reaction, so that carboxymethyl chitosan is grafted to the surfaces of the basalt fibers, and the hollow mesoporous silica microspheres are fixedly combined to the surfaces of the basalt fibers by utilizing the self physical adhesion effect of the carboxymethyl chitosan, so that the modified basalt fibers are obtained. The hollow mesoporous silica microspheres are combined on the surface of the basalt fiber, so that the roughness of the smooth surface of the basalt fiber is improved, and the bonding strength between the modified basalt fiber and the SBS modified asphalt is improved; on the other hand, after the modified basalt is doped into the SBS modified asphalt mixture, the SBS modified asphalt permeates into the interior of the hollow mesoporous silica microsphere from the surface mesopores of the hollow mesoporous silica microsphere for curing, so that the bonding strength between the SBS modified asphalt and the hollow mesoporous silica microsphere is increased, and the bonding stability of the SBS modified asphalt and the hollow mesoporous silica microsphere is improved.
Preferably, the mass ratio of the alkylated modified basalt fibers to the carboxymethyl chitosan is 1: 0.5-1.
Preferably, the preparation method of the hollow mesoporous silica microsphere comprises the following steps:
adding ethyl orthosilicate into ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain an aqueous phase solution, slowly dropwise adding the oil phase solution into the aqueous phase solution, stirring for 10-20min, then putting the mixture into an emulsifying machine for emulsification to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, stirring at the temperature of 20-25 ℃, performing hydrolytic condensation reaction for 30-40h, and performing spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, dropwise adding a hydrochloric acid solution to adjust the pH of the solution to 3-5, heating in a water bath to 40-50 ℃, stirring and hydrolyzing for 30-50min to obtain a hydrolysate, adding the nascent state hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 1-3h, centrifugally separating, washing, and drying to obtain the hollow mesoporous silica microspheres.
The invention uses ethyl orthosilicate as a precursor to prepare the hollow mesoporous silica microsphere, prevents SBS modified asphalt from permeating into the hollow mesoporous silica microsphere due to poor interface compatibility existing between the organic SBS modified asphalt and the inorganic hollow mesoporous silica microsphere, further uses vinyl triethoxysilane coupling agent to carry out surface modification treatment on the nascent state hollow mesoporous silica microsphere, grafts the vinyl triethoxysilane coupling agent on the surface of the hollow mesoporous silica microsphere, leads the surface of the hollow mesoporous silica microsphere to be organized, thereby improving the interface compatibility between the hollow mesoporous silica microspheres and the SBS modified asphalt, promoting the SBS modified asphalt to permeate into the hollow mesoporous silica microspheres, thereby improving the bonding strength between the SBS modified asphalt and the hollow mesoporous silica microspheres and improving the combination stability of the SBS modified asphalt and the hollow mesoporous silica microspheres.
Preferably, the mass ratio of the nascent-state hollow mesoporous silica microspheres to the vinyltriethoxysilane is 1: 0.2-0.5.
The preparation method of the anti-cracking basalt fiber asphalt mixture comprises the following steps: heating SBS modified asphalt to 165-175 ℃ to a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to dry to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 2-5min at 160-170 ℃ to obtain the SBS modified asphalt.
Therefore, the invention has the following advantages over the prior art:
1. according to the invention, the basalt fiber is modified, and the hollow mesoporous silica microspheres are combined on the surface of the basalt fiber, so that the roughness of the smooth surface of the basalt fiber is improved, and the bonding strength between the modified basalt fiber and SBS modified asphalt is improved; on the other hand, after the modified basalt is doped into the SBS modified asphalt mixture, the SBS modified asphalt permeates into the interior of the hollow mesoporous silica microsphere from the surface mesopores of the hollow mesoporous silica microsphere for curing, so that the stability of combination between the SBS modified asphalt and the hollow mesoporous silica microsphere is improved, and the improvement of the enhanced cracking resistance of the basalt fiber to the SBS modified asphalt mixture is improved.
2. According to the invention, the vinyl triethoxysilane coupling agent is used for carrying out surface modification treatment on the nascent-state hollow mesoporous silica microsphere, and the vinyl triethoxysilane coupling agent is grafted on the surface of the hollow mesoporous silica microsphere, so that the surface of the hollow mesoporous silica microsphere is organized, thus the interface compatibility between the hollow mesoporous silica microsphere and SBS modified asphalt is improved, the SBS modified asphalt is promoted to permeate into the hollow mesoporous silica microsphere, and the bonding stability between the SBS modified asphalt and the hollow mesoporous silica microsphere is further improved.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. In the present invention, unless otherwise specified, raw materials, equipment, and the like used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
The SBS modified asphalt used in the specific examples: penetration (25 ℃) is 7.1mm, softening point is 64 ℃, ductility (5cm/min, 5 ℃) is 48cm, penetration index is 0.5, solubility (trichloroethylene) is 99.8, kinematic viscosity (234 ℃) is 1.8Pa.s, catalpo chemical industry Co., Ltd; basalt fiber: model CBF13-6, single fiber diameter of 13 μm, length of 6mm, water content of 0.1%, Zhejiang Shijin basalt fiber Co., Ltd; carboxymethyl chitosan: viscosity of 10-100mpa.s, carboxylation degree of more than or equal to 80 percent, water insoluble substance of less than or equal to 1.0 percent and Bomei biological science and technology Limited company.
In the specific embodiment, the aggregate is basalt, and the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the grain size of the No. 1 material is 14-18mm, the grain size of the No. 2 material is 8-12mm, the grain size of the No. 3 material is 5-7mm, and the grain size of the No. 4 material is 1-3 mm; the mineral powder is limestone with the granularity less than 0.075 mm.
Example 1
The preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding tetraethoxysilane into ethyl acetate according to the mass ratio of 1:2 of tetraethoxysilane to the ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain a water phase solution, wherein the hexadecyl trimethyl ammonium chloride accounts for 10% of the mass of the deionized water, slowly dropwise adding the oil phase solution into the water phase solution, the volume ratio of the oil phase solution to the water phase solution is 1:10, stirring for 20min, then putting the mixture into an emulsifying machine, emulsifying for 10min at the rotating speed of 16000rmp to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, wherein the addition amount of the triethanolamine catalyst is 5.0% of the mass of the tetraethoxysilane, stirring at the temperature of 23 ℃, carrying out hydrolytic condensation reaction for 35h, and carrying out spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, wherein the volume ratio of the vinyl triethoxysilane to the ethanol to the water is 1:10:1, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the solution to 3, heating in a water bath to 50 ℃, stirring and hydrolyzing for 30min to obtain a hydrolysate, adding the nascent hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 2.5h, wherein the mass ratio of the nascent hollow mesoporous silica microspheres to the vinyl triethoxysilane is 1:0.4, centrifuging, separating, washing, and drying to obtain the hollow mesoporous silica microspheres.
The preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent KH560 into deionized water, wherein the mass ratio of the basalt fiber to the epoxy silane coupling agent KH560 to the deionized water is 1:0.2:10, uniformly stirring and mixing, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the system to 5, heating in a water bath to 60 ℃, stirring and reacting for 1.5h, filtering, washing and drying to obtain the alkylated modified basalt fiber; adding carboxymethyl chitosan into deionized water, stirring and dissolving to prepare a carboxymethyl chitosan aqueous solution with the concentration of 2.5 wt%, adding an alkylated modified basalt fiber into the carboxymethyl chitosan aqueous solution, wherein the mass ratio of the alkylated modified basalt fiber to the carboxymethyl chitosan is 1:0.8, then adding a stannic chloride catalyst, the addition amount of the stannic chloride catalyst is 6% of the mass of the carboxymethyl chitosan, heating the mixture in a water bath to 80 ℃, stirring and reacting for 4 hours, then adding hollow mesoporous silica microspheres, wherein the mass ratio of the hollow mesoporous silica microspheres to the alkylated modified basalt fiber is 1:5, stirring and mixing uniformly, standing for 13 hours, filtering and separating, washing, and drying to obtain the modified basalt fiber.
The anti-cracking basalt fiber asphalt mixture comprises the following components in percentage by mass:
4.3 percent of SBS modified asphalt, 0.4 percent of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, wherein the mineral powder accounts for 3.0% of the mass of the mineral aggregate, and the balance is the aggregate; the aggregate comprises No. 1 material, No. 2 material, No. 3 material and No. 4 material, wherein the No. 1 material accounts for 43 percent of the weight of the aggregate, the No. 2 material accounts for 28 percent of the weight of the aggregate, the No. 3 material accounts for 18 percent of the weight of the aggregate, and the balance is the No. 4 material.
The preparation method of the anti-cracking basalt fiber asphalt mixture comprises the following steps:
heating SBS modified asphalt to 175 ℃ to be in a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to be dried to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 2min at 170 ℃ to obtain the modified asphalt.
Example 2
The preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding tetraethoxysilane into ethyl acetate according to the mass ratio of 1:2 of tetraethoxysilane to the ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain a water phase solution, wherein the hexadecyl trimethyl ammonium chloride accounts for 10% of the mass of the deionized water, slowly dropwise adding the oil phase solution into the water phase solution, the volume ratio of the oil phase solution to the water phase solution is 1:10, stirring for 10min, then putting the mixture into an emulsifying machine, emulsifying for 10min at the rotating speed of 16000rmp to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, wherein the addition amount of the triethanolamine catalyst is 5.0% of the mass of the tetraethoxysilane, stirring at the temperature of 22 ℃ for hydrolysis condensation reaction for 32h, and performing spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, wherein the volume ratio of the vinyl triethoxysilane to the ethanol to the water is 1:10:1, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the solution to 5, heating in a water bath to 40 ℃, stirring and hydrolyzing for 50min to obtain a hydrolysate, adding the nascent hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 1.5h, wherein the mass ratio of the nascent hollow mesoporous silica microspheres to the vinyl triethoxysilane is 1:0.3, centrifuging, separating, washing, and drying to obtain the hollow mesoporous silica microspheres.
The preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent KH560 into deionized water, wherein the mass ratio of the basalt fiber to the epoxy silane coupling agent KH560 to the deionized water is 1:0.2:10, uniformly stirring and mixing, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the system to 3, heating in a water bath to 50 ℃, stirring and reacting for 1.5h, filtering, washing and drying to obtain the alkylated modified basalt fiber; adding carboxymethyl chitosan into deionized water, stirring and dissolving to prepare a carboxymethyl chitosan aqueous solution with the concentration of 2.5 wt%, adding an alkylated modified basalt fiber into the carboxymethyl chitosan aqueous solution, wherein the mass ratio of the alkylated modified basalt fiber to the carboxymethyl chitosan is 1:0.6, then adding a stannic chloride catalyst, the addition amount of the stannic chloride catalyst is 6% of the mass of the carboxymethyl chitosan, heating the mixture in a water bath to 80 ℃, stirring and reacting for 3 hours, then adding hollow mesoporous silica microspheres, wherein the mass ratio of the hollow mesoporous silica microspheres to the alkylated modified basalt fiber is 1:5, stirring and mixing uniformly, standing for 12 hours, filtering and separating, washing, and drying to obtain the modified basalt fiber.
The anti-cracking basalt fiber asphalt mixture comprises the following components in percentage by mass:
4.5 percent of SBS modified asphalt, 0.3 percent of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, wherein the mineral powder accounts for 1.5% of the mass of the mineral aggregate, and the balance is the aggregate; the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the No. 1 material accounts for 36 percent of the weight of the aggregate, the No. 2 material accounts for 28 percent of the weight of the aggregate, the No. 3 material accounts for 12 percent of the weight of the aggregate, and the balance is the No. 4 material.
The preparation method of the anti-cracking basalt fiber asphalt mixture comprises the following steps:
heating SBS modified asphalt to 165 ℃ to a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to dry to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 5min at 160 ℃, and obtaining the modified asphalt.
Example 3
The preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding tetraethoxysilane into ethyl acetate according to the mass ratio of 1:2 of tetraethoxysilane to the ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain a water phase solution, wherein the hexadecyl trimethyl ammonium chloride accounts for 10% of the mass of the deionized water, slowly dropwise adding the oil phase solution into the water phase solution, the volume ratio of the oil phase solution to the water phase solution is 1:10, stirring for 15min, then putting the mixture into an emulsifying machine, emulsifying for 10min at the rotating speed of 16000rmp to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, wherein the addition amount of the triethanolamine catalyst is 5.0% of the mass of the tetraethoxysilane, stirring at the temperature of 25 ℃, performing hydrolytic condensation reaction for 40h, and performing spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, wherein the volume ratio of the vinyl triethoxysilane to the ethanol to the water is 1:10:1, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the solution to 4, heating in a water bath to 45 ℃, stirring and hydrolyzing for 40min to obtain a hydrolysate, adding the nascent hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 3h, wherein the mass ratio of the nascent hollow mesoporous silica microspheres to the vinyl triethoxysilane is 1:0.5, and performing centrifugal separation, washing and drying to obtain the hollow mesoporous silica microspheres.
The preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent KH560 into deionized water, wherein the mass ratio of the basalt fiber to the epoxy silane coupling agent KH560 to the deionized water is 1:0.2:10, uniformly stirring and mixing, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the system to 4, heating in a water bath to 55 ℃, stirring and reacting for 2h, filtering, washing and drying to obtain the alkylated modified basalt fiber; adding carboxymethyl chitosan into deionized water, stirring and dissolving to prepare a carboxymethyl chitosan aqueous solution with the concentration of 2.5 wt%, adding an alkylated modified basalt fiber into the carboxymethyl chitosan aqueous solution, wherein the mass ratio of the alkylated modified basalt fiber to the carboxymethyl chitosan is 1:1, then adding a stannic chloride catalyst, the addition amount of the stannic chloride catalyst is 6% of the mass of the carboxymethyl chitosan, heating the mixture in a water bath to 85 ℃, stirring and reacting for 5 hours, then adding a hollow mesoporous silica microsphere, wherein the mass ratio of the hollow mesoporous silica microsphere to the alkylated modified basalt fiber is 1:5, stirring and mixing uniformly, standing for 15 hours, filtering, separating, washing and drying to obtain the modified basalt fiber.
The anti-cracking basalt fiber asphalt mixture comprises the following components in percentage by mass:
4.2 percent of SBS modified asphalt, 0.43 percent of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, wherein the mineral powder accounts for 2.0% of the mass of the mineral aggregate, and the balance is the aggregate; the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the No. 1 material accounts for 45 percent of the weight of the aggregate, the No. 2 material accounts for 30 percent of the weight of the aggregate, the No. 3 material accounts for 20 percent of the weight of the aggregate, and the balance is the No. 4 material.
The preparation method of the anti-cracking basalt fiber asphalt mixture comprises the following steps:
heating SBS modified asphalt to 170 ℃ to be in a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to be dried to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 3min at 165 ℃ to obtain the modified asphalt.
Example 4
The preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding tetraethoxysilane into ethyl acetate according to the mass ratio of 1:2 of tetraethoxysilane to the ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain a water phase solution, wherein the hexadecyl trimethyl ammonium chloride accounts for 10% of the mass of the deionized water, slowly dropwise adding the oil phase solution into the water phase solution, the volume ratio of the oil phase solution to the water phase solution is 1:10, stirring for 15min, then putting the mixture into an emulsifying machine, emulsifying for 10min at the rotating speed of 16000rmp to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, wherein the addition amount of the triethanolamine catalyst is 5.0% of the mass of the tetraethoxysilane, stirring at the temperature of 20 ℃, carrying out hydrolytic condensation reaction for 30h, and carrying out spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, wherein the volume ratio of the vinyl triethoxysilane to the ethanol to the water is 1:10:1, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the solution to 4, heating in a water bath to 45 ℃, stirring and hydrolyzing for 40min to obtain a hydrolysate, adding the nascent hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 1h, wherein the mass ratio of the nascent hollow mesoporous silica microspheres to the vinyl triethoxysilane is 1:0.2, and performing centrifugal separation, washing and drying to obtain the hollow mesoporous silica microspheres.
The preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent KH560 into deionized water, wherein the mass ratio of the basalt fiber to the epoxy silane coupling agent KH560 to the deionized water is 1:0.2:10, uniformly stirring and mixing, dropwise adding a hydrochloric acid solution with the concentration of 0.5mol/L to adjust the pH of the system to 4, heating in a water bath to 55 ℃, stirring and reacting for 1h, filtering, washing and drying to obtain the alkylated modified basalt fiber; adding carboxymethyl chitosan into deionized water, stirring and dissolving to prepare a carboxymethyl chitosan aqueous solution with the concentration of 2.5 wt%, adding an alkylated modified basalt fiber into the carboxymethyl chitosan aqueous solution, wherein the mass ratio of the alkylated modified basalt fiber to the carboxymethyl chitosan is 1:0.5, then adding a stannic chloride catalyst, the addition amount of the stannic chloride catalyst is 6% of the mass of the carboxymethyl chitosan, heating the mixture in a water bath to 75 ℃, stirring and reacting for 2 hours, then adding hollow mesoporous silica microspheres, wherein the mass ratio of the hollow mesoporous silica microspheres to the alkylated modified basalt fiber is 1:5, stirring and mixing uniformly, standing for 10 hours, filtering and separating, washing, and drying to obtain the modified basalt fiber.
The anti-cracking basalt fiber asphalt mixture comprises the following components in percentage by mass:
4.2 percent of SBS modified asphalt, 0.43 percent of modified basalt fiber and the balance of mineral aggregate; the mineral aggregate consists of aggregate and mineral powder, wherein the mineral powder accounts for 2.0% of the mass of the mineral aggregate, and the balance is the aggregate; the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the No. 1 material accounts for 35 percent of the weight of the aggregate, the No. 2 material accounts for 25 percent of the weight of the aggregate, the No. 3 material accounts for 10 percent of the weight of the aggregate, and the balance is the No. 4 material.
The preparation method of the anti-cracking basalt fiber asphalt mixture comprises the following steps:
heating SBS modified asphalt to 170 ℃ to be in a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to be dried to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 3min at 165 ℃ to obtain the modified asphalt.
Comparative example 1
Comparative example 1 is different from example 1 in that basalt fiber is not subjected to modification treatment.
Comparative example 2
The comparative example 2 is different from the example 1 in that the preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding tetraethoxysilane into ethyl acetate according to the mass ratio of 1:2 of tetraethoxysilane to the ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain a water phase solution, wherein the hexadecyl trimethyl ammonium chloride accounts for 10% of the mass of the deionized water, slowly dropwise adding the oil phase solution into the water phase solution, the volume ratio of the oil phase solution to the water phase solution is 1:10, stirring for 20min, then putting the mixture into an emulsifying machine, emulsifying for 10min at the rotating speed of 16000rmp to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, wherein the addition amount of the triethanolamine catalyst is 5.0% of the mass of the tetraethoxysilane, stirring at the temperature of 23 ℃, carrying out hydrolytic condensation reaction for 35h, and carrying out spray drying to obtain the hollow mesoporous silica microspheres.
And (3) performance detection:
and (3) determining the interfacial adhesion of the basalt fiber and SBS modified asphalt mixture:
mixing 4.3% SBS modified asphalt and 95.7% mineral material, heating to 170 deg.C to melt to obtain asphalt base material, pouring molten asphalt base material into asphalt mould, pouring half of the asphalt base material into mould, making basalt fiber penetrate into the gap between two ends of mould slowly, placing on the upper surface of asphalt material to keep horizontal, applying fine tension to two ends to straighten fiber, then slowly pouring the other half of asphalt material from one end to the other end of mould to make the sample slightly higher than the sample, standing the sample, cooling to room temperature, scraping out the asphalt material with convex surface by hot scraper, making basalt fiber embedded section and external section respectively, cutting off the fiber at non-stretching end of edge of test sample, placing the test sample on fixing pile to be fixed in test environment chamber, regulating position of clamp by controlling panel to make the clamping end of clamp return to zero position, then, enabling the basalt fiber at the free section at one end of the sample to pass through a small hole of a loading device and be connected with a clamp; covering an organic glass cover, switching on a power supply to start a testing machine, opening a temperature controller until the device is kept at a test temperature for 1h at a constant temperature, starting a drawing test, enabling a clamp connected with basalt fibers to move rightwards along with the drawing testing machine at a constant speed of 10mm/min, applying tension to the basalt fibers until the basalt fibers are completely drawn out, stopping the test, reading the change values of the tension and corresponding displacement data output by a data acquisition system, recording the maximum loads (N) of the basalt fibers with the fiber burial depths of 4mm, 8mm and 16mm, wherein the larger the maximum load of the basalt fibers is, the higher the bonding strength of the basalt fibers and asphalt is, and sequentially representing the interface bonding force of the basalt fibers and the SBS modified asphalt mixture.
And 2, testing the cracking resistance of the SBS modified asphalt mixture:
the method comprises the steps of forming a basalt fiber asphalt mixture plate-shaped sample with uniform thickness on a glass plate, wherein the size of the sample is 15cm multiplied by 12cm, carrying out a tensile test in a low-temperature environment box after the sample is respectively subjected to heat preservation for 3 hours at minus 10 ℃ and minus 20 ℃ before the test, wherein the tensile speed of an MTS tester is 10mm/min, stopping the test when the tensile force is attenuated to 50% of the limit tensile force, and collecting the stress and deformation of the sample in the whole test process. The ultimate tensile force of the basalt fiber asphalt mixture is tested through a tensile test so as to represent the anti-fission performance of the basalt fiber asphalt mixture in different low-temperature environments, and the calculation method of the tensile fracture energy of the basalt fiber asphalt mixture is as follows:
wherein W represents tensile breaking energy J; f represents the tensile force N applied to the test piece; a represents a specimen deformation amount m; a is0The deformation m of the test piece corresponding to the ultimate tensile force is shown.
The test results show that the tensile fracture energy of the asphalt mixture prepared in the examples 1-4 and the interface bonding between the basalt fiber and the asphalt base material are superior to those of the comparative example 1, and the results prove that the modification of the basalt fiber by the invention can obviously improve the cracking resistance of the basalt fiber to the asphalt mixture. The tensile fracture energy of the asphalt mixture prepared in the embodiments 1 to 4 and the interfacial adhesion between the basalt fiber and the asphalt base material are superior to those of the comparative example 2, which proves that the surface modification treatment of the nascent-state hollow mesoporous silica microsphere is performed by using the vinyltriethoxysilane coupling agent, and the vinyltriethoxysilane coupling agent is grafted on the surface of the hollow mesoporous silica microsphere, so that the surface of the hollow mesoporous silica microsphere is organized, the interfacial compatibility between the hollow mesoporous silica microsphere and the SBS modified asphalt can be improved, the SBS modified asphalt is promoted to permeate into the hollow mesoporous silica microsphere, and the adhesive strength between the SBS modified asphalt and the hollow mesoporous silica microsphere is further improved.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that several modifications may be made without departing from the technical principle of the present invention, and such modifications should be construed as the protection scope of the present invention.
Claims (10)
1. The anti-cracking basalt fiber asphalt mixture is characterized by comprising the following components in percentage by mass:
4.2-4.6% of SBS modified asphalt, 0.26-0.43% of modified basalt fiber and the balance of mineral aggregate;
the mineral aggregate consists of aggregate and mineral powder, and the mineral powder accounts for 1.5-3.0% of the mass of the mineral aggregate.
2. The anti-cracking basalt fiber asphalt mixture according to claim 1, wherein the aggregate is basalt; the aggregate comprises a No. 1 material, a No. 2 material, a No. 3 material and a No. 4 material, wherein the grain diameter of the No. 1 material is 14-18mm, the grain diameter of the No. 2 material is 8-12mm, the grain diameter of the No. 3 material is 5-7mm, and the grain diameter of the No. 4 material is 1-3 mm.
3. The anti-cracking basalt fiber asphalt mixture according to claim 2, wherein the 1# material accounts for 35-45% of the weight of the aggregate, the 2# material accounts for 25-30% of the weight of the aggregate, the 3# material accounts for 10-20% of the weight of the aggregate, and the balance is the 4# material.
4. The anti-cracking basalt fiber asphalt mixture according to claim 1, wherein the mineral powder is limestone with a particle size of less than 0.075 mm.
5. The anti-cracking basalt fiber asphalt mixture according to claim 1, wherein the preparation method of the modified basalt fiber comprises the following steps:
adding basalt fiber and an epoxy silane coupling agent into deionized water, stirring and mixing uniformly, dropwise adding a hydrochloric acid solution to adjust the pH of the system to 3-5, heating in a water bath to 50-60 ℃, stirring and reacting for 1-2h, filtering, washing and drying to obtain alkylated modified basalt fiber; adding the alkylated modified basalt fiber into a carboxymethyl chitosan aqueous solution, then adding a stannic chloride catalyst, heating in a water bath to 75-85 ℃, stirring for reaction for 2-5h, then adding the hollow mesoporous silica microspheres, stirring and mixing uniformly, standing for 10-15h, filtering, separating, washing and drying to obtain the modified basalt fiber.
6. The anti-cracking basalt fiber asphalt mixture according to claim 5, wherein the mass ratio of the alkylated modified basalt fiber to the carboxymethyl chitosan is 1: 0.5-1.
7. The anti-cracking basalt fiber asphalt mixture according to claim 5, wherein the preparation method of the hollow mesoporous silica microspheres comprises the following steps:
adding ethyl orthosilicate into ethyl acetate, uniformly stirring to obtain an oil phase solution, adding a hexadecyl trimethyl ammonium chloride emulsifier into deionized water, uniformly stirring to obtain an aqueous phase solution, slowly dropwise adding the oil phase solution into the aqueous phase solution, stirring for 10-20min, then putting the mixture into an emulsifying machine for emulsification to obtain an emulsion, adding a triethanolamine catalyst into the emulsion, stirring at the temperature of 20-25 ℃, performing hydrolytic condensation reaction for 30-40h, and performing spray drying to obtain nascent state hollow mesoporous silica microspheres; adding vinyl triethoxysilane into a mixed solution of ethanol and water, dropwise adding a hydrochloric acid solution to adjust the pH of the solution to 3-5, heating in a water bath to 40-50 ℃, stirring and hydrolyzing for 30-50min to obtain a hydrolysate, adding the nascent state hollow mesoporous silica microspheres into the hydrolysate, stirring and reacting for 1-3h, centrifugally separating, washing, and drying to obtain the hollow mesoporous silica microspheres.
8. The anti-cracking basalt fiber asphalt mixture according to claim 7, wherein the volume ratio of the oil phase solution to the water phase solution is 1: 10.
9. The anti-cracking basalt fiber asphalt mixture according to claim 7, wherein the mass ratio of the nascent state hollow mesoporous silica microspheres to the vinyltriethoxysilane is 1: 0.2-0.5.
10. A method for preparing a cracking-resistant basalt fiber asphalt mixture according to any one of claims 1 to 9, comprising the steps of: heating SBS modified asphalt to 165-175 ℃ to a molten state to obtain molten SBS modified asphalt, then placing mineral aggregate in an oven to dry to constant weight, adding the dried mineral aggregate and modified basalt fiber into the molten SBS modified asphalt, stirring and mixing for 2-5min at 160-170 ℃ to obtain the SBS modified asphalt.
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| CN114276051A (en) * | 2021-12-22 | 2022-04-05 | 苏州东振路桥工程有限公司 | Anti-cracking cold-mixed asphalt for pavement restoration and preparation method thereof |
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Application publication date: 20201110 |