CN109825098B - Modified heavy traffic asphalt and preparation method thereof - Google Patents
Modified heavy traffic asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses modified heavy traffic asphalt and a preparation method thereof, wherein the modified heavy traffic asphalt comprises the following raw materials in parts by weight: 80-100 parts of matrix asphalt, 2-6 parts of SBS, 1-5 parts of mineral powder, 1-5 parts of basalt fiber and 1-3 parts of stabilizer. The modified heavy-traffic asphalt and the preparation method thereof have wide raw material sources, and the high-temperature stability and the low-temperature cracking resistance of the asphalt are obviously improved by modifying the raw materials, so that the modified heavy-traffic asphalt can meet the road service performance and prolong the road service life.
Description
Technical Field
The invention relates to the technical field of asphalt modification, in particular to modified heavy traffic asphalt and a preparation method thereof.
Background
The asphalt material is one of the common materials for road engineering, and the modified asphalt is used for improving the road performance of the asphalt material and the asphalt mixture by adding a modifier. Along with the development of social economy, the traffic volume is continuously increased, the proportion of heavy-duty vehicles presents a continuously increasing trend, great challenges are brought to the quality of the pavement, and a lot of newly-built asphalt pavements have serious problems such as swelling, breaking and the like, which are caused mainly by insufficient high-temperature stability of pavement materials. Asphalt as the most important component of pavement materials plays a decisive role in the quality of pavement, and an ideal asphalt material should satisfy the following requirements: the SBS modified asphalt has higher stiffness at high temperature, lower stiffness at low temperature and good anti-stripping effect in the presence of water, and can meet the requirements in a balanced manner, so that the SBS modified asphalt becomes a preferred building material for high-grade highway construction.
However, in the prior art, the compatibility with SBS is poor, and stable modified asphalt is not easy to form, so that the high-temperature stability of the modified asphalt is poor, the softening point is low, and the road use requirement is not met.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide the modified heavy-traffic asphalt and the preparation method thereof, so that the high-temperature stability and the low-temperature cracking resistance of the asphalt are obviously improved, and the modified heavy-traffic asphalt can meet the road service performance.
The purpose of the invention is realized by the following technical scheme:
the modified heavy traffic asphalt comprises the following raw materials in parts by weight: 80-100 parts of matrix asphalt, 2-6 parts of SBS, 1-5 parts of mineral powder, 1-5 parts of basalt fiber and 1-3 parts of stabilizer.
The modified heavy traffic asphalt comprises the following raw materials in parts by weight: 80-100 parts of matrix asphalt, 2-6 parts of SBS, 1-5 parts of mineral powder, 1-5 parts of modified basalt fiber and 1-3 parts of stabilizer.
The stabilizer is PEG400 and/or diethylene glycol.
Preferably, the stabilizer is a mixture of PEG400 and diethylene glycol, and the mass ratio of the PEG400 to the diethylene glycol is (1-5): 1.
the mineral powder is modified serpentine and/or modified vermiculite.
Preferably, the mineral powder is a mixture of modified serpentine and modified vermiculite, and the mass ratio of the modified serpentine to the modified vermiculite is (1-5): (1-5).
The preparation method of the modified serpentine comprises the following steps of: adding 2-6 parts of sorbitan fatty acid ester into 60-100 parts of ethanol, stirring at 40-50 ℃ for 8-12 minutes at 100-300 r/min, adding 5-10 parts of serpentine powder, stirring at 40-50 ℃ for 40-60 minutes at 100-300 r/min, centrifuging at 3000-5000 r/min for 10-20 minutes, drying the lower-layer precipitate at 60-80 ℃ to constant weight, grinding, and sieving with 200-500 mesh sieve to obtain the modified serpentine.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 5-10 parts of vermiculite powder into 40-60 parts of water, adding 2-6 parts of sodium stearate, stirring at 60-80 ℃ at 300 revolutions per minute of 100-;
(2) adding 2-6 parts of n-butyl borate and 1-5 parts of PEG10000 into 20-40 parts of ethanol, stirring for 20-30 minutes at 100-300 r/min to obtain a mixed solution, mixing 2-4 parts of acetic acid and 0.5-1 part of water, stirring for 8-12 minutes at 100-300 r/min to obtain an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, stirring for 60-90 minutes at 75-85 ℃ at 100-300 r/min, adding 5-10 parts of pretreated vermiculite powder, and continuously stirring for 90-180 minutes at 75-85 ℃ at 100-300 r/min to obtain a mixture;
(3) drying the mixture at 90-100 ℃ for 2-6 hours, then preserving the heat at 400-500 ℃ for 1-3 hours to obtain a solid, grinding the solid, and sieving with a 200-500-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 1-5 parts of basalt fiber into 15-25 parts of 0.2-2mol/L sulfuric acid aqueous solution, stirring at 20-30 ℃ for 30-50 minutes at 300 revolutions per minute, filtering by adopting 500-mesh filter cloth, washing a filter cake until the filtrate is neutral, and drying the filter cake at 60-80 ℃ to constant weight to obtain acid modified basalt fiber;
(2) mixing 10-20 parts of ethanol and 10-20 parts of water uniformly, adding 0.1-0.5 part of ethyl orthosilicate, stirring for 5-10 minutes at 300 revolutions per minute of 100-50 ℃ to obtain a mixed solution, adding 5-10 parts of graphene oxide into the mixed solution, stirring for 20-40 minutes at 500 revolutions per minute of 300-50 ℃ and 10-20 minutes at 5000 revolutions per minute of 3000-80 ℃, and drying the precipitate at 60-80 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 4-8 parts of modified graphene oxide into 15-25 parts of water, stirring for 20-40 minutes at 500 revolutions per minute of 300-plus-one, adding 5-10 parts of styrene-butadiene latex, stirring for 8-12 minutes at 300 revolutions per minute of 100-plus-one, then adding 5-10 parts of acid modified basalt fiber, stirring for 8-12 minutes at 300 revolutions per minute of 100-plus-one at 20-30 ℃, standing for 20-40 minutes, filtering by adopting 500-plus-800-mesh filter cloth, washing a filter cake for 1-3 times by using 15-25 parts of water, and drying at 60-80 ℃ to constant weight to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at the temperature of 150-; SBS and stabilizer are added into the melted asphalt, and the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 20-30 min, mineral powder is added, the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 20-30 min, modified basalt fiber is added, the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 30-40 min, and the mixture is stirred at 600-1200 r/min for 60-90 min to obtain the modified heavy traffic asphalt.
The matrix asphalt is heavy traffic asphalt.
The heavy cross-linked asphalt meets the petroleum asphalt required by JTG F40-2004 standard.
The modified heavy-traffic asphalt and the preparation method thereof have wide raw material sources, and the high-temperature stability and the low-temperature cracking resistance of the asphalt are obviously improved by modifying the raw materials, so that the modified heavy-traffic asphalt can meet the road service performance and prolong the road service life.
Detailed Description
In the present invention, all the equipment and materials are commercially available or commonly used in the art, and the methods in the following examples are conventional in the art unless otherwise specified.
Graphene oxide, manufactured by Beijing Deke island gold science and technology Limited, has a thickness of 0.55-1.2nm and a diameter of 0.5-3 μm.
The matrix asphalt is re-cross-linked asphalt which is petrochemical produced in Jinling and has the model number of 70 #.
SBS, a styrene-butadiene-styrene block copolymer, is SBS available under the trademark 1401(YH-792) produced by the well petrochemical industry.
Basalt fiber, manufactured by Beijing Xika composite materials science and technology Limited, has a length of 3mm and a diameter of 10-12 μm.
PEG400, namely polyethylene glycol 400, is PEG400 produced by Jiangsu Haian petrochemical plants.
PEG10000, namely polyethylene glycol 10000, is produced by Jiangsu Haian petrochemical plant.
Diethylene glycol, CAS number: 111-46-6, available from makelin biochemical technologies, inc, shanghai, product number: D807402.
the serpentine is produced by Shijiazhuanyu Lei building materials Co Ltd, and the particle size is as follows: 300 meshes.
Vermiculite, silver white vermiculite powder produced by Lingshou county Yufeng mineral processing factory, granularity: 300 meshes.
Sorbitan fatty acid esters, namely Span80, CAS number: 1338-43-8, available from Shanghai Michelin Biotechnology, Inc., under product number: and S817933.
Sodium stearate, CAS number: 822-16-2, available from makeln biochemical technologies, inc, product number: and S817803.
N-butyl borate, CAS number: 688-74-4, available from Shanghai Michelin Biochemical technology, Inc., product number: t818860.
Acetic acid, CAS No.: 64-19-7, glacial acetic acid purchased from Shanghai Aladdin Biotechnology, Inc., product number: A116166.
tetraethoxysilane, CAS No.: 78-10-4, available from Shanghai Michelin Biochemical technology Ltd, product number: t819505.
The styrene-butadiene latex is butadiene/styrene copolymer, 106# styrene-butadiene latex manufactured by Jining HuaKai resin Co., Ltd, and the brand is F0603.
Example 1
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of basalt fiber and 2 parts of stabilizer.
The stabilizer is PEG 400.
The mineral powder is modified vermiculite.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 8 parts of vermiculite powder into 50 parts of water, adding 4 parts of sodium stearate, stirring at 70 ℃ at 200 rpm for 50 minutes, centrifuging at 4000 rpm for 15 minutes, and drying the lower-layer precipitate at 70 ℃ to constant weight to obtain pretreated vermiculite powder;
(2) adding 4 parts of n-butyl borate and 3 parts of PEG10000 to 30 parts of ethanol, stirring for 30 minutes at 200 revolutions per minute to obtain a mixed solution, mixing 3 parts of acetic acid and 0.8 part of water, stirring for 10 minutes at 200 revolutions per minute to obtain an acetic acid solution, dropwise adding the acetic acid solution to the mixed solution, stirring for 80 minutes at 200 revolutions per minute at 80 ℃, adding 8 parts of pretreated vermiculite powder, and continuously stirring for 120 minutes at 200 revolutions per minute at 80 ℃ to obtain a mixture;
(3) drying the mixture at 95 ℃ for 4 hours, then preserving the heat at 450 ℃ for 2 hours to obtain a solid, grinding the solid, and sieving the solid with a 300-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the molten asphalt, shearing at 190 deg.c for 25 min at 5000 rpm, adding mineral powder, shearing at 190 deg.c for 25 min at 5000 rpm, adding basalt fiber, shearing at 190 deg.c at 5000 rpm for 35 min, and stirring at 1000 rpm for 80 min to obtain the modified re-cross-linked asphalt.
Example 2
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of modified basalt fiber and 2 parts of stabilizer.
The stabilizer is PEG 400.
The mineral powder is modified vermiculite.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 8 parts of vermiculite powder into 50 parts of water, adding 4 parts of sodium stearate, stirring at 70 ℃ at 200 rpm for 50 minutes, centrifuging at 4000 rpm for 15 minutes, and drying the lower-layer precipitate at 70 ℃ to constant weight to obtain pretreated vermiculite powder;
(2) adding 4 parts of n-butyl borate and 3 parts of PEG10000 to 30 parts of ethanol, stirring for 30 minutes at 200 revolutions per minute to obtain a mixed solution, mixing 3 parts of acetic acid and 0.8 part of water, stirring for 10 minutes at 200 revolutions per minute to obtain an acetic acid solution, dropwise adding the acetic acid solution to the mixed solution, stirring for 80 minutes at 200 revolutions per minute at 80 ℃, adding 8 parts of pretreated vermiculite powder, and continuously stirring for 120 minutes at 200 revolutions per minute at 80 ℃ to obtain a mixture;
(3) drying the mixture at 95 ℃ for 4 hours, then preserving the heat at 450 ℃ for 2 hours to obtain a solid, grinding the solid, and sieving the solid with a 300-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 3 parts of basalt fiber into 20 parts of 1mol/L sulfuric acid aqueous solution, stirring at 25 ℃ at 200 rpm for 40 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake until filtrate is neutral, and drying the filter cake at 70 ℃ to constant weight to obtain acid modified basalt fiber;
(2) uniformly mixing 15 parts of ethanol and 15 parts of water, adding 0.3 part of ethyl orthosilicate, stirring for 8 minutes at 200 revolutions per minute to obtain a mixed solution, adding 8 parts of graphene oxide into the mixed solution, stirring for 30 minutes at 45 ℃ at 400 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, and drying the precipitate at 70 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 6 parts of modified graphene oxide into 20 parts of water, stirring for 30 minutes at 400 rpm, adding 8 parts of styrene-butadiene latex, stirring for 10 minutes at 200 rpm, adding 8 parts of acid modified basalt fiber, stirring for 10 minutes at 200 rpm at 25 ℃, standing for 30 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake for 2 times by using 20 parts of water, and drying to constant weight at 70 ℃ to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the melted asphalt, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding mineral powder, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding modified basalt fiber, shearing at 190 ℃ for 35 minutes at 5000 r/min, and stirring at 1000 r/min for 80 minutes to obtain the modified heavy traffic asphalt.
Example 3
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of modified basalt fiber and 2 parts of stabilizer.
The stabilizer is PEG 400.
The mineral powder is modified serpentine.
The preparation method of the modified serpentine comprises the following steps of: adding 4 parts of sorbitan fatty acid ester into 80 parts of ethanol, stirring for 10 minutes at 45 ℃ at 200 revolutions per minute, adding 8 parts of serpentine powder, stirring for 50 minutes at 45 ℃ at 200 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, drying the lower-layer precipitate at 70 ℃ to constant weight, grinding, and sieving with a 300-mesh sieve to obtain the modified serpentine.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 3 parts of basalt fiber into 20 parts of 1mol/L sulfuric acid aqueous solution, stirring at 25 ℃ at 200 rpm for 40 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake until filtrate is neutral, and drying the filter cake at 70 ℃ to constant weight to obtain acid modified basalt fiber;
(2) uniformly mixing 15 parts of ethanol and 15 parts of water, adding 0.3 part of ethyl orthosilicate, stirring for 8 minutes at 200 revolutions per minute to obtain a mixed solution, adding 8 parts of graphene oxide into the mixed solution, stirring for 30 minutes at 45 ℃ at 400 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, and drying the precipitate at 70 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 6 parts of modified graphene oxide into 20 parts of water, stirring for 30 minutes at 400 rpm, adding 8 parts of styrene-butadiene latex, stirring for 10 minutes at 200 rpm, adding 8 parts of acid modified basalt fiber, stirring for 10 minutes at 200 rpm at 25 ℃, standing for 30 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake for 2 times by using 20 parts of water, and drying to constant weight at 70 ℃ to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the melted asphalt, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding mineral powder, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding modified basalt fiber, shearing at 190 ℃ for 35 minutes at 5000 r/min, and stirring at 1000 r/min for 80 minutes to obtain the modified heavy traffic asphalt.
Example 4
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of modified basalt fiber and 2 parts of stabilizer.
The stabilizer is PEG 400.
The mineral powder is a mixture of modified serpentine and modified vermiculite, and the mass ratio of the modified serpentine to the modified vermiculite is 2: 3.
the preparation method of the modified serpentine comprises the following steps of: adding 4 parts of sorbitan fatty acid ester into 80 parts of ethanol, stirring for 10 minutes at 45 ℃ at 200 revolutions per minute, adding 8 parts of serpentine powder, stirring for 50 minutes at 45 ℃ at 200 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, drying the lower-layer precipitate at 70 ℃ to constant weight, grinding, and sieving with a 300-mesh sieve to obtain the modified serpentine.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 8 parts of vermiculite powder into 50 parts of water, adding 4 parts of sodium stearate, stirring at 70 ℃ at 200 rpm for 50 minutes, centrifuging at 4000 rpm for 15 minutes, and drying the lower-layer precipitate at 70 ℃ to constant weight to obtain pretreated vermiculite powder;
(2) adding 4 parts of n-butyl borate and 3 parts of PEG10000 to 30 parts of ethanol, stirring for 30 minutes at 200 revolutions per minute to obtain a mixed solution, mixing 3 parts of acetic acid and 0.8 part of water, stirring for 10 minutes at 200 revolutions per minute to obtain an acetic acid solution, dropwise adding the acetic acid solution to the mixed solution, stirring for 80 minutes at 200 revolutions per minute at 80 ℃, adding 8 parts of pretreated vermiculite powder, and continuously stirring for 120 minutes at 200 revolutions per minute at 80 ℃ to obtain a mixture;
(3) drying the mixture at 95 ℃ for 4 hours, then preserving the heat at 450 ℃ for 2 hours to obtain a solid, grinding the solid, and sieving the solid with a 300-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 3 parts of basalt fiber into 20 parts of 1mol/L sulfuric acid aqueous solution, stirring at 25 ℃ at 200 rpm for 40 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake until filtrate is neutral, and drying the filter cake at 70 ℃ to constant weight to obtain acid modified basalt fiber;
(2) uniformly mixing 15 parts of ethanol and 15 parts of water, adding 0.3 part of ethyl orthosilicate, stirring for 8 minutes at 200 revolutions per minute to obtain a mixed solution, adding 8 parts of graphene oxide into the mixed solution, stirring for 30 minutes at 45 ℃ at 400 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, and drying the precipitate at 70 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 6 parts of modified graphene oxide into 20 parts of water, stirring for 30 minutes at 400 rpm, adding 8 parts of styrene-butadiene latex, stirring for 10 minutes at 200 rpm, adding 8 parts of acid modified basalt fiber, stirring for 10 minutes at 200 rpm at 25 ℃, standing for 30 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake for 2 times by using 20 parts of water, and drying to constant weight at 70 ℃ to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the melted asphalt, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding mineral powder, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding modified basalt fiber, shearing at 190 ℃ for 35 minutes at 5000 r/min, and stirring at 1000 r/min for 80 minutes to obtain the modified heavy traffic asphalt.
Example 5
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of modified basalt fiber and 2 parts of stabilizer.
The stabilizer is diethylene glycol.
The mineral powder is a mixture of modified serpentine and modified vermiculite, and the mass ratio of the modified serpentine to the modified vermiculite is 2: 3.
the preparation method of the modified serpentine comprises the following steps of: adding 4 parts of sorbitan fatty acid ester into 80 parts of ethanol, stirring for 10 minutes at 45 ℃ at 200 revolutions per minute, adding 8 parts of serpentine powder, stirring for 50 minutes at 45 ℃ at 200 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, drying the lower-layer precipitate at 70 ℃ to constant weight, grinding, and sieving with a 300-mesh sieve to obtain the modified serpentine.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 8 parts of vermiculite powder into 50 parts of water, adding 4 parts of sodium stearate, stirring at 70 ℃ at 200 rpm for 50 minutes, centrifuging at 4000 rpm for 15 minutes, and drying the lower-layer precipitate at 70 ℃ to constant weight to obtain pretreated vermiculite powder;
(2) adding 4 parts of n-butyl borate and 3 parts of PEG10000 to 30 parts of ethanol, stirring for 30 minutes at 200 revolutions per minute to obtain a mixed solution, mixing 3 parts of acetic acid and 0.8 part of water, stirring for 10 minutes at 200 revolutions per minute to obtain an acetic acid solution, dropwise adding the acetic acid solution to the mixed solution, stirring for 80 minutes at 200 revolutions per minute at 80 ℃, adding 8 parts of pretreated vermiculite powder, and continuously stirring for 120 minutes at 200 revolutions per minute at 80 ℃ to obtain a mixture;
(3) drying the mixture at 95 ℃ for 4 hours, then preserving the heat at 450 ℃ for 2 hours to obtain a solid, grinding the solid, and sieving the solid with a 300-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 3 parts of basalt fiber into 20 parts of 1mol/L sulfuric acid aqueous solution, stirring at 25 ℃ at 200 rpm for 40 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake until filtrate is neutral, and drying the filter cake at 70 ℃ to constant weight to obtain acid modified basalt fiber;
(2) uniformly mixing 15 parts of ethanol and 15 parts of water, adding 0.3 part of ethyl orthosilicate, stirring for 8 minutes at 200 revolutions per minute to obtain a mixed solution, adding 8 parts of graphene oxide into the mixed solution, stirring for 30 minutes at 45 ℃ at 400 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, and drying the precipitate at 70 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 6 parts of modified graphene oxide into 20 parts of water, stirring for 30 minutes at 400 rpm, adding 8 parts of styrene-butadiene latex, stirring for 10 minutes at 200 rpm, adding 8 parts of acid modified basalt fiber, stirring for 10 minutes at 200 rpm at 25 ℃, standing for 30 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake for 2 times by using 20 parts of water, and drying to constant weight at 70 ℃ to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the melted asphalt, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding mineral powder, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding modified basalt fiber, shearing at 190 ℃ for 35 minutes at 5000 r/min, and stirring at 1000 r/min for 80 minutes to obtain the modified heavy traffic asphalt.
Example 6
Modified heavy traffic asphalt raw materials (parts by weight): 90 parts of matrix asphalt, 5 parts of SBS, 3 parts of mineral powder, 3 parts of modified basalt fiber and 2 parts of stabilizer.
The stabilizer is a mixture of PEG400 and diethylene glycol, and the mass ratio of the PEG400 to the diethylene glycol is 3: 1.
the mineral powder is a mixture of modified serpentine and modified vermiculite, and the mass ratio of the modified serpentine to the modified vermiculite is 2: 3.
the preparation method of the modified serpentine comprises the following steps of: adding 4 parts of sorbitan fatty acid ester into 80 parts of ethanol, stirring for 10 minutes at 45 ℃ at 200 revolutions per minute, adding 8 parts of serpentine powder, stirring for 50 minutes at 45 ℃ at 200 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, drying the lower-layer precipitate at 70 ℃ to constant weight, grinding, and sieving with a 300-mesh sieve to obtain the modified serpentine.
The preparation method of the modified vermiculite comprises the following steps of:
(1) adding 8 parts of vermiculite powder into 50 parts of water, adding 4 parts of sodium stearate, stirring at 70 ℃ at 200 rpm for 50 minutes, centrifuging at 4000 rpm for 15 minutes, and drying the lower-layer precipitate at 70 ℃ to constant weight to obtain pretreated vermiculite powder;
(2) adding 4 parts of n-butyl borate and 3 parts of PEG10000 to 30 parts of ethanol, stirring for 30 minutes at 200 revolutions per minute to obtain a mixed solution, mixing 3 parts of acetic acid and 0.8 part of water, stirring for 10 minutes at 200 revolutions per minute to obtain an acetic acid solution, dropwise adding the acetic acid solution to the mixed solution, stirring for 80 minutes at 200 revolutions per minute at 80 ℃, adding 8 parts of pretreated vermiculite powder, and continuously stirring for 120 minutes at 200 revolutions per minute at 80 ℃ to obtain a mixture;
(3) drying the mixture at 95 ℃ for 4 hours, then preserving the heat at 450 ℃ for 2 hours to obtain a solid, grinding the solid, and sieving the solid with a 300-mesh sieve to obtain the modified vermiculite.
The preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 3 parts of basalt fiber into 20 parts of 1mol/L sulfuric acid aqueous solution, stirring at 25 ℃ at 200 rpm for 40 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake until filtrate is neutral, and drying the filter cake at 70 ℃ to constant weight to obtain acid modified basalt fiber;
(2) uniformly mixing 15 parts of ethanol and 15 parts of water, adding 0.3 part of ethyl orthosilicate, stirring for 8 minutes at 200 revolutions per minute to obtain a mixed solution, adding 8 parts of graphene oxide into the mixed solution, stirring for 30 minutes at 45 ℃ at 400 revolutions per minute, centrifuging for 15 minutes at 4000 revolutions per minute, and drying the precipitate at 70 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 6 parts of modified graphene oxide into 20 parts of water, stirring for 30 minutes at 400 rpm, adding 8 parts of styrene-butadiene latex, stirring for 10 minutes at 200 rpm, adding 8 parts of acid modified basalt fiber, stirring for 10 minutes at 200 rpm at 25 ℃, standing for 30 minutes, filtering by adopting 800-mesh filter cloth, washing a filter cake for 2 times by using 20 parts of water, and drying to constant weight at 70 ℃ to obtain the modified basalt fiber.
The preparation method of the modified heavy-traffic asphalt comprises the following steps: weighing the raw materials according to the parts by weight, melting the matrix asphalt at 165 ℃, heating to 190 ℃, and shearing at 5000 r/min for 15 minutes to obtain molten asphalt; adding SBS and stabilizer into the melted asphalt, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding mineral powder, shearing at 190 ℃ for 25 minutes at 5000 r/min, adding modified basalt fiber, shearing at 190 ℃ for 35 minutes at 5000 r/min, and stirring at 1000 r/min for 80 minutes to obtain the modified heavy traffic asphalt.
Test example 1
The road performance of the modified heavy traffic asphalt of the embodiment is tested, the penetration at 25 ℃, the softening point and the ductility at 5 ℃ are mainly tested, the test is carried out according to the test specification of road engineering asphalt and asphalt mixture (JTG E20-2011), and the specific test results are shown in Table 1.
Table 1 table of performance test results for modified heavy traffic asphalt road
The embodiment 2 adopts the modified basalt fiber, and the comprehensive performance of the modified heavy-traffic asphalt is superior to that of the embodiment 1, because the basalt fiber has a smooth surface and a low surface energy, and the acid modification improves the surface roughness of the fiber, increases the surface energy, and is beneficial to the modification of the basalt fiber by the modified graphene oxide, so that the performance of the modified heavy-traffic asphalt is improved.
Test example 2
The dynamic viscosity at 60 ℃ of the modified heavy-traffic asphalt prepared in the example was tested by using a Brookfield method, and the dynamic viscosity at 60 ℃ was used as an index for evaluating the high-temperature stability of the modified asphalt, and the specific test results are shown in Table 2.
TABLE 2 dynamic viscosity at 60 ℃ test result table for modified heavy traffic asphalt
Claims (3)
1. The modified heavy traffic asphalt is characterized by comprising the following raw materials in parts by weight: 80-100 parts of matrix asphalt, 2-6 parts of SBS, 1-5 parts of mineral powder, 1-5 parts of modified basalt fiber and 1-3 parts of stabilizer;
the mineral powder is a mixture of modified serpentine and modified vermiculite, and the mass ratio of the modified serpentine to the modified vermiculite is (1-5): (1-5);
the preparation method of the modified serpentine comprises the following steps of: adding 2-6 parts of sorbitan fatty acid ester into 60-100 parts of ethanol, stirring at 40-50 ℃ for 8-12 minutes at 100-300 r/min, adding 5-10 parts of serpentine powder, stirring at 40-50 ℃ for 40-60 minutes at 100-300 r/min, centrifuging at 3000-5000 r/min for 10-20 minutes, drying the lower-layer precipitate at 60-80 ℃ to constant weight, grinding, and sieving with a 200-500 mesh sieve to obtain modified serpentine;
the preparation method of the modified vermiculite comprises the following steps of:
(1) adding 5-10 parts of vermiculite powder into 40-60 parts of water, adding 2-6 parts of sodium stearate, stirring at 60-80 ℃ at 300 revolutions per minute of 100-;
(2) adding 2-6 parts of n-butyl borate and 1-5 parts of PEG10000 into 20-40 parts of ethanol, stirring for 20-30 minutes at 100-300 r/min to obtain a mixed solution, mixing 2-4 parts of acetic acid and 0.5-1 part of water, stirring for 8-12 minutes at 100-300 r/min to obtain an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, stirring for 60-90 minutes at 75-85 ℃ at 100-300 r/min, adding 5-10 parts of pretreated vermiculite powder, and continuously stirring for 90-180 minutes at 75-85 ℃ at 100-300 r/min to obtain a mixture;
(3) drying the mixture at 90-100 ℃ for 2-6 hours, then preserving heat at 400-500 ℃ for 1-3 hours to obtain a solid, grinding the solid, and sieving with a 200-500-mesh sieve to obtain modified vermiculite;
the preparation method of the modified basalt fiber comprises the following steps of:
(1) adding 1-5 parts of basalt fiber into 15-25 parts of 0.2-2mol/L sulfuric acid aqueous solution, stirring at 20-30 ℃ for 30-50 minutes at 300 revolutions per minute, filtering by adopting 500-mesh filter cloth, washing a filter cake until the filtrate is neutral, and drying the filter cake at 60-80 ℃ to constant weight to obtain acid modified basalt fiber;
(2) mixing 10-20 parts of ethanol and 10-20 parts of water uniformly, adding 0.1-0.5 part of ethyl orthosilicate, stirring for 5-10 minutes at 300 revolutions per minute of 100-50 ℃ to obtain a mixed solution, adding 5-10 parts of graphene oxide into the mixed solution, stirring for 20-40 minutes at 500 revolutions per minute of 300-50 ℃ and 10-20 minutes at 5000 revolutions per minute of 3000-80 ℃, and drying the precipitate at 60-80 ℃ to constant weight to obtain modified graphene oxide;
(3) adding 4-8 parts of modified graphene oxide into 15-25 parts of water, stirring for 20-40 minutes at 500 revolutions per minute of 300-plus-one, adding 5-10 parts of styrene-butadiene latex, stirring for 8-12 minutes at 300 revolutions per minute of 100-plus-one, then adding 5-10 parts of acid modified basalt fiber, stirring for 8-12 minutes at 300 revolutions per minute of 100-plus-one at 20-30 ℃, standing for 20-40 minutes, filtering by adopting 500-plus-800-mesh filter cloth, washing a filter cake for 1-3 times by using 15-25 parts of water, and drying at 60-80 ℃ to constant weight to obtain the modified basalt fiber.
2. The modified heavy traffic asphalt of claim 1, wherein the stabilizer is PEG400 and/or diethylene glycol.
3. The process for preparing modified heavy-traffic asphalt according to claim 1 or 2, comprising the steps of: weighing the raw materials according to the parts by weight, melting the matrix asphalt at the temperature of 150-; SBS and stabilizer are added into the melted asphalt, and the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 20-30 min, mineral powder is added, the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 20-30 min, modified basalt fiber is added, the mixture is cut at 3000-6000 r/min at 180-200 ℃ for 30-40 min, and the mixture is stirred at 600-1200 r/min for 60-90 min to obtain the modified heavy traffic asphalt.
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Effective date of registration: 20210407 Address after: No.658 Yuanli Avenue, Jinfeng street, West Dongting Biotechnology Park, national high tech Industrial Development Zone, Changde City, Hunan Province, 415000 Applicant after: Changde Jinniu Tongda asphalt Co.,Ltd. Address before: 343726 No.48, Zhouliu village, Yuanqian Town, Taihe County, Ji'an City, Jiangxi Province Applicant before: Liu Jianjun |
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