CN115710099A - Asphalt mixture for ultrathin overlay pavement and preparation method thereof - Google Patents
Asphalt mixture for ultrathin overlay pavement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an asphalt mixture for ultrathin overlay pavement and a preparation method thereof, belonging to the technical field of asphalt and comprising the following raw materials in parts by weight: 80-85 parts of aggregate, 10-12 parts of matrix asphalt, 3-4 parts of mineral powder, 2.5-3 parts of modified graphene oxide, 2-3 parts of modified fiber and 2-3 parts of filler; the preparation method comprises the following steps: firstly, mixing aggregate and matrix asphalt to obtain a premix; and secondly, adding mineral powder, modified graphene oxide, modified fibers and fillers into the premix, keeping the temperature unchanged, and continuously mixing. The modified graphene oxide is used as a raw material and added into the mixture, so that a better solid cross-linked network is achieved, the layer-by-layer structure of the graphene oxide can effectively prevent invasion of thermal oxygen, and sodium lignosulfonate is combined to further inhibit thermal oxygen aging, so that the stability of the asphalt mixture is enhanced, the low-temperature crack resistance of the asphalt mixture is improved, and the durability of the asphalt mixture is better improved.
Description
Technical Field
The invention belongs to the technical field of asphalt, and particularly relates to an asphalt mixture for ultrathin overlay pavement and a preparation method thereof.
Background
After the asphalt pavement is built, under the condition that a base layer of the asphalt pavement is not structurally damaged, surface aging, fine aggregate loss, coarse aggregate peeling, pot holes, slight cracks and other early diseases of different degrees usually occur under the common influence of external factors such as vehicle load, air temperature, precipitation and the like and internal factors such as material characteristics, quality defects and the like. The diseases not only affect the traffic capacity of the road, but also greatly shorten the service life of the road. The asphalt pavement ultrathin overlay technology has short construction period and low manufacturing cost, and is suitable for recovering and improving the surface functions of old asphalt pavements and newly-built pavements.
Because the ultrathin overlay asphalt mixture is positioned at the uppermost layer of the pavement structure, the ultrathin overlay asphalt mixture needs to have good low-temperature resistance and high-temperature resistance, for example, after the ultrathin overlay asphalt mixture is directly contacted with strong sunlight in summer, the temperature is rapidly increased, the modulus and the shear strength of the mixture are rapidly reduced, the asphalt mixture is softened, and the defects of uneven pavement due to different pavement asphalt thicknesses can occur; under the low temperature condition in the north, the pavement is easy to embrittle and crust, the asphalt mixture arches and loses the pavement evenness; in addition, the ultrathin overlay asphalt mixture needs to have certain anti-rutting capability, and the pavement is easy to generate diseases such as waves, pushing, rutting and the like under the repeated action of the running load, so that the running comfort and the skid resistance of the pavement are influenced, and the driving safety is threatened.
Disclosure of Invention
The invention aims to provide an asphalt mixture for ultrathin overlay pavement and a preparation method thereof, and aims to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
the asphalt mixture for paving the ultrathin overlay comprises the following raw materials in parts by weight:
80-85 parts of aggregate, 10-12 parts of matrix asphalt, 3-4 parts of mineral powder, 2.5-3 parts of modified graphene oxide, 2-3 parts of modified fiber and 2-3 parts of filler;
the modified graphene oxide is prepared by the following steps:
step S1, adding graphene oxide into deionized water, performing ultrasonic dispersion for 15min, then adding polyethyleneimine, heating to 80 ℃, stirring for reaction for 8h, after the reaction is finished, performing centrifugal washing, and performing freeze drying to obtain pretreated graphene oxide;
and S2, under the condition of nitrogen protection, adding the pretreated graphene oxide and sodium lignosulfonate into water, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃, reacting for 2 hours, and after the reaction is finished, filtering, washing and drying to obtain the modified graphene oxide.
Further, the dosage ratio of the graphene oxide, the polyethyleneimine and the deionized water in the step S1 is 0.1g:100mL of: 5g of the total weight of the mixture; in the step S2, the dosage ratio of the pretreated graphene oxide to the sodium lignin sulfonate to the water is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5 percent of the mass of sodium lignosulfonate, and the addition amount of N, N' -methylene-bisacrylamide is 0.2 percent of the mass of the sodium lignosulfonate. Firstly, reacting graphene oxide with polyethyleneimine, introducing amino groups on the graphene oxide to obtain pretreated graphene oxide, providing a reaction group for subsequent reaction, and then performing grafting reaction with sodium lignosulfonate to obtain modified graphene oxide.
Further, the aggregates comprise 3mm-5mm continuous graded first aggregates and 0mm-3mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 7:3. the aggregate belongs to natural aggregate, and comprises broken stones, pebbles, pumice stones, natural sand and the like.
Further, the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is 70# matrix asphalt.
Further, the modified fiber is prepared by the following steps:
adding dopamine hydrochloride into a Tris-HCl buffer solution, adjusting the pH value to 8.5, then adding acrylonitrile fiber, soaking for 20 hours, taking out after soaking, and washing and drying in vacuum to obtain pretreated fiber; the concentration of the Tris-HCl buffer solution is 10mmol/L, and the dosage ratio of the dopamine hydrochloride to the Tris-HCl buffer solution to the acrylonitrile fiber is 1g:50mL of: 1g of the total weight of the composition.
And adding the pretreated fiber into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after soaking, washing with ethanol, and drying at 30 ℃ to obtain the modified fiber. The ethanol can be recycled. The concentration of the ethanol solution of n-dodecyl mercaptan is 0.5mmol/L, and the ratio of the amount of the pretreated fiber to the ethanol solution of n-dodecyl mercaptan is 1g:50mL.
The surface of the fiber is treated by dopamine, a polydopamine layer is deposited on the surface of the fiber, various functional groups such as catechol and amine are introduced to serve as active sites after dopamine modification, and the hydrophobicity of the surface of the fiber is improved and the application effect is improved after n-dodecyl mercaptan treatment.
A preparation method of an asphalt mixture for ultrathin overlay pavement comprises the following steps:
firstly, weighing raw materials according to parts by weight, and mixing 80-85 parts of aggregate and 10-12 parts of matrix asphalt to obtain a premix at the mixing temperature of 175-185 ℃ for 30-35min;
and secondly, adding 3-4 parts of mineral powder, 2.5-3 parts of modified graphene oxide, 2-3 parts of modified fiber and 2-3 parts of filler into the premix, keeping the temperature unchanged, and continuously mixing for 30-35min to obtain the asphalt mixture for paving the ultrathin overlay.
The invention has the beneficial effects that:
in order to reduce the influence on the road surface height and save the construction cost, a thin-layer paving process is usually adopted to conduct paving treatment on an asphalt surface layer, so that the apparent function of a road is recovered, the running quality is improved, and the service life of the road surface is prolonged; the modified graphene oxide is obtained after the grafting reaction of the modified graphene oxide with the graphene oxide and sodium lignosulfonate, the layer-by-layer structure of the graphene oxide can effectively prevent the invasion of hot oxygen, and the thermal oxidation aging is further inhibited by combining the capability of combining the sodium lignosulfonate with free radicals generated by aging, in addition, a composite structure formed after the grafting of the sodium lignosulfonate and the graphene oxide can prevent the further development of micro cracks, enhance the stability of the asphalt mixture, improve the low-temperature crack resistance of the asphalt mixture and better improve the durability of the asphalt mixture.
In addition, a modified fiber is added, the fiber is used as an asphalt mixture additive, the pavement performances of the asphalt mixture, such as water stability, high-temperature stability, low-temperature crack resistance and the like, can be effectively improved, the poly-dopamine modified polyacrylonitrile fiber can be adhered to the surfaces of various organic and inorganic materials, the mechanical riveting effect between the modified fiber and an asphalt composite material is facilitated, meanwhile, the hydrophobicity of the fiber is also improved, and the fiber has better dispersibility in oily liquid such as asphalt. The reinforcing mechanism of the fiber asphalt mixture mainly comprises the functions of bridging crack resistance, interface reinforcement, stabilization and toughening crack resistance. The modified fiber and the modified graphene oxide have a synergistic effect, and the overall performance of the asphalt mixture for ultrathin overlay pavement is further improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing modified fiber:
adding dopamine hydrochloride into a Tris-HCl buffer solution, adjusting the pH value to 8.5, then adding acrylonitrile fiber, soaking for 20 hours, taking out after soaking, washing with water, and drying in vacuum to obtain pretreated fiber; the concentration of the Tris-HCl buffer solution is 10mmol/L, and the dosage ratio of the dopamine hydrochloride to the Tris-HCl buffer solution to the acrylonitrile fiber is 1g:50mL of: 1g of the total weight of the composition.
And adding the pretreated fiber into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after soaking, washing with ethanol, and drying at 30 ℃ to obtain the modified fiber. The concentration of the n-dodecyl mercaptan ethanol solution is 0.5mmol/L, and the dosage ratio of the pretreated fiber to the n-dodecyl mercaptan ethanol solution is 1g:50mL.
Example 2
Preparing modified graphene oxide:
step S1, adding graphene oxide into deionized water, performing ultrasonic dispersion for 15min, then adding polyethyleneimine, heating to 80 ℃, stirring for reaction for 8h, after the reaction is finished, performing centrifugal washing, and performing freeze drying to obtain pretreated graphene oxide; the dosage ratio of the graphene oxide to the polyethyleneimine to the deionized water is 0.1g:100mL of: 5g of the total weight of the feed;
and S2, under the condition of nitrogen protection, adding the pretreated graphene oxide and sodium lignosulfonate into water, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃, reacting for 2 hours, and after the reaction is finished, filtering, washing and drying to obtain the modified graphene oxide. The dosage ratio of the pretreated graphene oxide to the sodium lignin sulfonate to water is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5 percent of the mass of sodium lignosulfonate, and the addition amount of N, N' -methylene-bisacrylamide is 0.2 percent of the mass of the sodium lignosulfonate.
Example 3
A preparation method of an asphalt mixture for ultrathin overlay pavement comprises the following steps:
weighing raw materials according to parts by weight, and mixing 80 parts of aggregate and 10 parts of matrix asphalt to obtain a premix at the mixing temperature of 175 ℃ for 30min;
and secondly, adding 3 parts of mineral powder, 2.5 parts of modified graphene oxide prepared in example 2, 2 parts of modified fiber prepared in example 1 and 2 parts of filler into the premix, keeping the temperature unchanged, and continuously mixing for 30min to obtain the asphalt mixture for ultrathin overlay pavement. The aggregates comprise 3mm-5mm continuous graded first aggregates and 0mm-3mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 7:3; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is No. 70 matrix asphalt.
Example 4
A preparation method of an asphalt mixture for ultrathin overlay pavement comprises the following steps:
firstly, weighing raw materials according to parts by weight, mixing 85 parts of aggregate and 112 parts of matrix asphalt to obtain a premix, wherein the mixing temperature is 175 ℃, and the mixing time is 30min;
and secondly, adding 4 parts of mineral powder, 3 parts of modified graphene oxide prepared in example 2, 3 parts of modified fiber prepared in example 1 and 3 parts of filler into the premix, keeping the temperature unchanged, and continuously mixing for 35min to obtain the asphalt mixture for paving the ultrathin overlay. The aggregates comprise 3mm-5mm continuous graded first aggregates and 0mm-3mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 7:3; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is No. 70 matrix asphalt.
Example 5
A preparation method of an asphalt mixture for ultrathin overlay pavement comprises the following steps:
firstly, weighing raw materials according to parts by weight, and mixing 85 parts of aggregate and 12 parts of matrix asphalt to obtain a premix, wherein the mixing temperature is 185 ℃, and the mixing time is 35min;
and secondly, adding 4 parts of mineral powder, 3 parts of modified graphene oxide prepared in example 2, 3 parts of modified fiber prepared in example 1 and 3 parts of filler into the premix, keeping the temperature unchanged, and continuously mixing for 35min to obtain the asphalt mixture for paving the ultrathin overlay. The aggregates comprise 3mm-5mm continuous graded first aggregates and 0mm-3mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 7:3; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is No. 70 matrix asphalt.
Comparative example 1:
compared with the embodiment 5, the modified graphene oxide is replaced by graphene oxide and sodium lignosulfonate, and the mass ratio of the graphene oxide to the sodium lignosulfonate is 1:1.
comparative example 2:
compared with example 5, the modified fiber is replaced by the pretreated fiber prepared in example 1, and the rest of the raw materials and the preparation process are the same as those in example 5.
The performance tests of the examples 3 to 5 and the comparative examples 1 to 2 are carried out, and the performance tests are carried out according to the road engineering asphalt and asphalt mixture test regulation (JTGE 20-2011) of the Ministry of transportation, such as freeze-thaw cleavage residual strength ratio, rutting test stability, water permeability coefficient and ductility indexes after aging (T0610-2011 asphalt rotating film heating test); the results are shown in table 1:
TABLE 1
As can be seen from Table 1, the asphalt mixture for ultrathin overlay pavement prepared by the invention has good temperature resistance, stable aging resistance and excellent anti-rutting performance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The asphalt mixture for ultrathin overlay pavement is characterized by comprising the following raw materials in parts by weight: 80-85 parts of aggregate, 10-12 parts of matrix asphalt, 3-4 parts of mineral powder, 2.5-3 parts of modified graphene oxide, 2-3 parts of modified fiber and 2-3 parts of filler;
the modified graphene oxide is prepared by the following steps:
step S1, adding graphene oxide into deionized water, performing ultrasonic dispersion for 15min, then adding polyethyleneimine, heating to 80 ℃, stirring for reaction for 8h, after the reaction is finished, performing centrifugal washing, and performing freeze drying to obtain pretreated graphene oxide;
and S2, under the condition of nitrogen protection, adding the pretreated graphene oxide and sodium lignosulfonate into water, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃ to react for 2 hours, and after the reaction is finished, filtering, washing and drying to obtain the modified graphene oxide.
2. The asphalt mixture for ultrathin overlay pavement according to claim 1, wherein the dosage ratio of the graphene oxide, the polyethyleneimine and the deionized water in the step S1 is 0.1g:100mL of: 5g of the total weight of the mixture; in the step S2, the dosage ratio of the pretreated graphene oxide to the sodium lignin sulfonate to the water is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5% of the mass of sodium lignosulfonate, and the addition amount of N, N' -methylene bisacrylamide is 0.2% of the mass of sodium lignosulfonate.
3. The bituminous mixture for ultrathin overlay paving of claim 1, wherein the aggregates comprise 3mm-5mm continuous graded first aggregates and 0mm-3mm continuous graded second aggregates, and the mass ratio of the first aggregates to the second aggregates is 7:3.
4. the asphalt mixture for ultrathin overlay pavement according to claim 1, wherein the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is No. 70 matrix asphalt.
5. The asphalt mixture for ultrathin overlay pavement according to claim 1, wherein the modified fiber is prepared by the following steps:
adding dopamine hydrochloride into a Tris-HCl buffer solution, adjusting the pH value to 8.5, then adding acrylonitrile fiber, soaking for 20 hours, taking out after soaking, washing with water, and drying in vacuum to obtain pretreated fiber;
and adding the pretreated fiber into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after soaking, washing with ethanol, and drying at 30 ℃ to obtain the modified fiber.
6. The method for preparing the asphalt mixture for ultrathin overlay pavement according to claim 1, characterized by comprising the following steps:
firstly, weighing raw materials according to parts by weight, and mixing aggregate and matrix asphalt to obtain a premix;
and secondly, adding mineral powder, modified graphene oxide, modified fibers and fillers into the premix, and continuously mixing to obtain the ultrathin asphalt mixture for paving the overlay surface.
7. The method for preparing the asphalt mixture for ultrathin overlay pavement according to claim 6, wherein the mixing temperature in the first step is 175-185 ℃, and the mixing time is 30-35min; the mixing temperature in the second step is 175-185 deg.C, and mixing is continued for 30-35min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109534725A (en) * | 2018-12-20 | 2019-03-29 | 河北中路伦特路面工程技术研究有限公司 | The ultra-thin High Modulus Asphalt Mixture of mating formation of one kind, preparation method and its evaluation method |
| CN113372064A (en) * | 2021-06-23 | 2021-09-10 | 重庆烯达科技有限公司 | Graphene oxide modified cement concrete and preparation method thereof |
| CN114957904A (en) * | 2021-08-28 | 2022-08-30 | 张健 | Wear-resistant polyethylene |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109534725A (en) * | 2018-12-20 | 2019-03-29 | 河北中路伦特路面工程技术研究有限公司 | The ultra-thin High Modulus Asphalt Mixture of mating formation of one kind, preparation method and its evaluation method |
| CN113372064A (en) * | 2021-06-23 | 2021-09-10 | 重庆烯达科技有限公司 | Graphene oxide modified cement concrete and preparation method thereof |
| CN114957904A (en) * | 2021-08-28 | 2022-08-30 | 张健 | Wear-resistant polyethylene |
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