CN115710099B - 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 ultra-thin asphalt mixture for paving a cover surface 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 premix; and secondly, adding mineral powder, modified graphene oxide, modified fiber and filler into the premix, keeping the temperature unchanged, and continuing mixing. The modified graphene oxide serving as a raw material is added into the mixture, has a better solid cross-linked network, the layer-by-layer structure of the graphene oxide can effectively prevent invasion of thermal oxygen, and is combined with sodium lignin sulfonate 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 ultra-thin asphalt mixture for paving a cover surface and a preparation method thereof.
Background
After the asphalt pavement is built, under the condition that the base layer is not structurally damaged, early diseases with different degrees such as surface aging, fine aggregate scattering, coarse aggregate peeling, pits and slight cracks 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. These diseases not only affect the traffic capacity of the road, but also significantly shorten the service life of the road. The ultra-thin overlay technology of the asphalt pavement has short construction period and low cost, and is suitable for recovering and improving the surface functions of old asphalt pavement and newly built pavement.
Because the ultrathin overlay asphalt mixture is positioned on the uppermost layer of the pavement structure, the ultrathin overlay asphalt mixture is required 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 rapidly reduce the softening of the asphalt mixture, and the defects of uneven pavement caused by different pavement asphalt thickness can occur; under the northern low-temperature condition, the pavement is easy to embrittle and crust, the asphalt mixture arches, and the pavement flatness is lost; in addition, the ultra-thin top-coat asphalt mixture needs to have certain rut resistance, and the road surface is easy to generate diseases such as waves, pushing, rutting and the like under the repeated action of running load, so that the running comfort and the skid resistance of the road surface are affected, and the running safety is threatened.
Disclosure of Invention
The invention aims to provide an ultrathin asphalt mixture for paving a cover surface and a preparation method thereof, which are used for solving the problems in the background technology.
The aim of the invention can be achieved by the following technical scheme:
an ultra-thin asphalt mixture for paving a cover surface 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, and after the reaction is finished, performing centrifugal washing and freeze drying to obtain pretreated graphene oxide;
and S2, adding the pretreated graphene oxide and sodium lignin sulfonate into water under the protection of nitrogen, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃ for reaction for 2 hours, and filtering, washing and drying after the reaction is finished to obtain the modified graphene oxide.
Further, the dosage ratio of graphene oxide, polyethyleneimine and deionized water in step S1 is 0.1g:100mL:5g; the dosage ratio of the pretreated graphene oxide, sodium lignin sulfonate and water in the step S2 is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5% of the mass of sodium lignin sulfonate, and the addition amount of N, N' -methylenebisacrylamide is 0.2% of the mass of sodium lignin sulfonate. Firstly, reacting graphene oxide with polyethyleneimine, introducing amino groups into the graphene oxide to obtain pretreated graphene oxide, providing reaction groups for subsequent reactions, and performing grafting reaction with sodium lignin sulfonate to obtain modified graphene oxide.
Further, the aggregate comprises a first aggregate with 3mm-5mm continuous grading and a second aggregate with 0mm-3mm continuous grading, and the mass ratio of the first aggregate to the second aggregate is 7:3. the aggregate belongs to natural aggregates, including broken stone, pebble, pumice, natural sand and the like.
Further, the particle size of the mineral powder is smaller than 0.08mm; the matrix asphalt is 70# matrix asphalt.
Further, the modified fiber is prepared by the steps of:
adding dopamine hydrochloride into Tris-HCl buffer solution, regulating the pH value to 8.5, adding acrylonitrile fiber, soaking for 20 hours, taking out after the soaking is finished, 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, the Tris-HCl buffer solution and the acrylonitrile fiber is 1g:50mL:1g.
And adding the pretreated fibers into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after the soaking is finished, flushing with ethanol, and drying at 30 ℃ to obtain the modified fibers. The ethanol can be reused. The concentration of the ethanol solution of n-dodecyl mercaptan is 0.5mmol/L, and the dosage ratio of the pretreated fiber to the ethanol solution of n-dodecyl mercaptan is 1g:50mL.
The surface of the fiber is treated by using dopamine, a polydopamine layer is deposited on the surface of the fiber, after the dopamine is modified, various functional groups such as catechol, amine and the like are introduced as active sites, and after n-dodecyl mercaptan treatment, the hydrophobicity of the surface of the fiber is improved, and the application effect is improved.
The preparation method of the asphalt mixture for ultrathin overlay pavement comprises the following steps:
firstly, weighing raw materials according to parts by weight, mixing 80-85 parts of aggregate and 10-12 parts of matrix asphalt to obtain premix, wherein the mixing temperature is 175-185 ℃, and the mixing time is 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 road elevation and save engineering cost, a thin layer paving process is generally adopted to carry out paving treatment on an asphalt surface layer, so that the apparent function of a road is recovered, the driving quality is improved, and the service life of the road is prolonged; the modified graphene oxide is obtained after grafting reaction of the modified graphene oxide and sodium lignosulfonate, the layer-by-layer structure of the graphene oxide can effectively prevent invasion of thermal oxygen, and the thermal oxygen aging can be further inhibited by combining the capability of sodium lignosulfonate for combining with free radicals generated by aging.
In addition, the modified fiber is added as an asphalt mixture additive, so that the water stability, high-temperature stability, low-temperature crack resistance and other road performances of the asphalt mixture can be effectively improved. The reinforcing mechanism of the fiber asphalt mixture mainly has bridging crack resistance, interface reinforcing, stabilizing and toughening crack resistance. The modified fiber and the modified graphene oxide have synergistic effect, so that the overall performance of the asphalt mixture for ultrathin overlay pavement is further improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Preparing modified fibers:
adding dopamine hydrochloride into Tris-HCl buffer solution, regulating the pH value to 8.5, adding acrylonitrile fiber, soaking for 20 hours, taking out after the soaking is finished, 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, the Tris-HCl buffer solution and the acrylonitrile fiber is 1g:50mL:1g.
And adding the pretreated fibers into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after the soaking is finished, flushing with ethanol, and drying at 30 ℃ to obtain the modified fibers. The concentration of the ethanol solution of n-dodecyl mercaptan is 0.5mmol/L, and the dosage ratio of the pretreated fiber to the ethanol solution of n-dodecyl mercaptan 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, and after the reaction is finished, performing centrifugal washing and freeze drying to obtain pretreated graphene oxide; the dosage ratio of graphene oxide, polyethyleneimine and deionized water is 0.1g:100mL:5g;
and S2, adding the pretreated graphene oxide and sodium lignin sulfonate into water under the protection of nitrogen, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃ for reaction for 2 hours, and filtering, washing and drying after the reaction is finished to obtain the modified graphene oxide. The dosage ratio of the pretreated graphene oxide, the sodium lignin sulfonate and the water is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5% of the mass of sodium lignin sulfonate, and the addition amount of N, N' -methylenebisacrylamide is 0.2% of the mass of sodium lignin sulfonate.
Example 3
The preparation method of the asphalt mixture for ultrathin overlay pavement comprises the following steps:
firstly, weighing raw materials according to parts by weight, and mixing 80 parts of aggregate and 10 parts of matrix asphalt to obtain a premix, wherein the mixing temperature is 175 ℃ and the mixing time is 30min;
and secondly, adding 3 parts of mineral powder, 2.5 parts of modified graphene oxide prepared in the example 2, 2 parts of modified fiber prepared in the example 1 and 2 parts of filler into the premix, keeping the temperature unchanged, and continuously mixing for 30 minutes to obtain the asphalt mixture for ultrathin finish pavement. The aggregate comprises a first aggregate with 3mm-5mm continuous grading and a second aggregate with 0mm-3mm continuous grading, and the mass ratio of the first aggregate to the second aggregate is 7:3, a step of; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is 70# matrix asphalt.
Example 4
The preparation method of the 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 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 the example 2, 3 parts of modified fiber prepared in the 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 cover surface. The aggregate comprises a first aggregate with 3mm-5mm continuous grading and a second aggregate with 0mm-3mm continuous grading, and the mass ratio of the first aggregate to the second aggregate is 7:3, a step of; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is 70# matrix asphalt.
Example 5
The preparation method of the 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 the example 2, 3 parts of modified fiber prepared in the 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 cover surface. The aggregate comprises a first aggregate with 3mm-5mm continuous grading and a second aggregate with 0mm-3mm continuous grading, and the mass ratio of the first aggregate to the second aggregate is 7:3, a step of; the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is 70# matrix asphalt.
Comparative example 1:
compared with example 5, the modified graphene oxide is changed into graphene oxide and sodium lignin sulfonate, and the mass ratio of the graphene oxide to the sodium lignin sulfonate is 1:1.
comparative example 2:
in comparison with example 5, the modified fiber was replaced with the pretreated fiber prepared in example 1, and the remaining raw materials and preparation process were the same as in example 5.
Performance tests were performed on examples 3 to 5 and comparative examples 1 to 2 according to the department of transportation "Highway engineering asphalt and asphalt mixture test procedure" (JTGE 20-2011), and the freezing-thawing split residual strength ratio, the rutting test stability, the water permeability coefficient and the ductility index 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 ultra-thin asphalt mixture for paving the overlay has good temperature resistance, stable aging resistance and excellent rut resistance.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
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, and after the reaction is finished, performing centrifugal washing and freeze drying to obtain pretreated graphene oxide;
s2, adding pretreated graphene oxide and sodium lignin sulfonate into water under the protection of nitrogen, stirring and dispersing, then adding potassium persulfate and N, N' -methylene bisacrylamide, heating to 85 ℃ for reaction for 2 hours, and filtering, washing and drying after the reaction is finished to obtain modified graphene oxide;
the modified fiber is prepared by the following steps:
adding dopamine hydrochloride into Tris-HCl buffer solution, regulating the pH value to 8.5, adding acrylonitrile fiber, soaking for 20 hours, taking out after the soaking is finished, washing with water, and drying in vacuum to obtain pretreated fiber;
and adding the pretreated fibers into an ethanol solution of n-dodecyl mercaptan, soaking for 20 hours, taking out after the soaking is finished, flushing with ethanol, and drying at 30 ℃ to obtain the modified fibers.
2. The asphalt mixture for ultrathin pavement according to claim 1, wherein the dosage ratio of graphene oxide, polyethylenimine and deionized water in the step S1 is 0.1g:100mL:5g; the dosage ratio of the pretreated graphene oxide, sodium lignin sulfonate and water in the step S2 is 1g:1g:100mL; the addition amount of potassium persulfate is 0.5% of the mass of sodium lignin sulfonate, and the addition amount of N, N' -methylenebisacrylamide is 0.2% of the mass of sodium lignin sulfonate.
3. The ultra-thin mat-paving asphalt mixture according to claim 1, wherein the aggregate comprises a first aggregate of 3mm to 5mm continuous grading and a second aggregate of 0mm to 3mm continuous grading, and the mass ratio of the first aggregate to the second aggregate is 7:3.
4. the ultra-thin mat-paving asphalt mixture according to claim 1, wherein the particle size of the mineral powder is less than 0.08mm; the matrix asphalt is 70# matrix asphalt.
5. The method for preparing the asphalt mixture for ultra-thin finish pavement according to claim 1, which is 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 filler into the premix, and continuously mixing to obtain the asphalt mixture for paving the ultrathin overlay.
6. The method for preparing an ultra-thin mat-paving asphalt mixture according to claim 5, 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 ℃, 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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| 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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