CN111003970A - Preparation method of drainage warm-mix recycled asphalt mixture - Google Patents
Preparation method of drainage warm-mix recycled asphalt mixture Download PDFInfo
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- CN111003970A CN111003970A CN201911355422.XA CN201911355422A CN111003970A CN 111003970 A CN111003970 A CN 111003970A CN 201911355422 A CN201911355422 A CN 201911355422A CN 111003970 A CN111003970 A CN 111003970A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention provides a preparation method of a drainage warm mix recycled asphalt mixture, which comprises the following steps: obtaining a recycled asphalt mixture, and performing an extraction experiment on the recycled asphalt mixture to determine a recycling grading curve and the content of recycled asphalt in the recycled asphalt mixture; determining the mass ratio of the drainage warm-mixed recycled asphalt to the drainage warm-mixed recycled asphalt according to the original grading of the recycled asphalt and the target grading of the drainage warm-mixed recycled asphalt; determining the mass ratio of the new asphalt to the composite drainage warm-mix regenerant in the drainage warm-mix regenerated asphalt and the mass ratio of the new aggregate required for preparing the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture; and preparing the drainage warm-mix recycled asphalt according to the prepared drainage warm-mix recycled asphalt. The drainage warm mix recycled asphalt mixture prepared by the preparation method has good road performance, excellent energy-saving and environment-friendly performance and low cost investment.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a preparation method of a drained warm-mixed recycled asphalt mixture.
Background
The composition of the drainage asphalt mixture is more than 80% of coarse aggregate, and in the long-term traffic operation process, the phenomenon of scattering and particle falling of the coarse aggregate inevitably occurs due to the aging of asphalt cement and the repeated action of vehicle load. When the flying particle-falling diseases reach a certain degree, the framework embedding and extruding structure of the coarse aggregate gradually loses the support, so that the deterioration of the flying particle-falling diseases is aggravated, and the comfort and the safety of road surface running are influenced.
The drainage recycled asphalt mixture is a novel 'green environment-friendly' asphalt mixture, and the recycled pavement materials are added, so that the problem of piling up a large amount of milling waste materials is solved, and the problem of capital loss of a large amount of materials is avoided.
Drainage regeneration and warm mixing technology in China starts late, research on asphalt regeneration technology at home and abroad mainly focuses on recovery and performance evaluation of common asphalt pavement materials, regeneration of old materials and use of regenerants mostly focus on hot regeneration and cold regeneration of aged asphalt mixtures, although a plurality of research results are obtained, technical problems of high mixing temperature, low utilization rate of RAP (reclaimed asphalt mixture) and the like exist in the hot regeneration process, secondary aging of reclaimed asphalt is accelerated, energy consumption is high, and emitted gas pollutes the environment; although the cold mixing regeneration mixing temperature is low, the pavement performance is poorer.
Disclosure of Invention
The invention aims to provide a preparation method of a drainage warm mix recycled asphalt mixture, which effectively solves the technical problems of poor pavement performance and the like of the existing asphalt mixture.
The technical scheme provided by the invention is as follows:
a preparation method of a drainage warm-mix recycled asphalt mixture comprises the following steps:
obtaining a recycled asphalt mixture, and performing an extraction experiment on the recycled asphalt mixture to determine a recycling grading curve and the content of recycled asphalt in the recycled asphalt mixture;
determining the mass ratio of the drainage warm-mixed recycled asphalt to the drainage warm-mixed recycled asphalt according to the original grading of the recycled asphalt and the target grading of the drainage warm-mixed recycled asphalt;
determining the mass ratio of the new asphalt to the composite drainage warm-mix regenerant in the drainage warm-mix regenerated asphalt, and determining the mass ratio of the new aggregate required for preparing the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture;
and preparing the drainage warm-mix regenerated asphalt according to the mass ratio of the drainage warm-mix regenerated asphalt to the recycled asphalt mixture and the mass ratio of the new asphalt in the drainage warm-mix regenerated asphalt to the composite drainage warm-mix regenerant, and further preparing the drainage warm-mix regenerated asphalt mixture according to the mass ratio of the new aggregate required by the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture.
Further preferably, the preparing of the drain warm-mixed reclaimed asphalt according to the mass ratio of the drain warm-mixed reclaimed asphalt to the reclaimed asphalt mixture and the mass ratio of the new asphalt to the composite drain warm-mixed regenerant in the drain warm-mixed reclaimed asphalt comprises:
mixing and stirring the surfactant and the warm-mixing agent uniformly to obtain a composite warm-mixing agent;
adding a regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent into the composite warm-mixing agent, and uniformly stirring to obtain a composite drainage warm-mixing regenerant;
and adding the composite drainage warm-mixing regenerant into new asphalt, heating and stirring to prepare the drainage warm-mixing regenerated asphalt.
More preferably, the surfactant and the warm mixing agent are mixed and stirred uniformly to obtain the compoundIn the warm mixing agent, the warm mixing agent is
And the warm mixing agent is 2-5% of the mass of the drained warm-mixed recycled asphalt mixture.
Preferably, the regenerant, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent are added into the composite warm-mixing agent and are uniformly stirred to obtain the composite drainage warm-mixing regenerant, the regenerant is aromatic oil, the anti-aging agent is one or two of RD and PB-2, and the mass of the composite drainage warm-mixing regenerant is 10-32% of the mass of the recycled asphalt in the recycled asphalt mixture
More preferably, the composite warm-mix regenerant is prepared by adding the regenerant, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent into the composite warm-mix regenerant and uniformly stirring, wherein the mass fraction of the regenerant is 60-75%, the mass fraction of the high-viscosity asphalt modifier RST is 20-35%, the mass fraction of the anti-aging agent is 1.5-2%, and the mass fraction of the fiber stabilizer is 2-3%.
Preferably, the surfactant and the warm-mixing agent are mixed and stirred uniformly to obtain the composite warm-mixing agent, the stirring temperature is 135-155 ℃, and the stirring time is 5-10 min; and/or
Adding a regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent into the composite warm-mixing agent, and uniformly stirring to obtain the composite drainage warm-mixing regenerant, wherein the stirring temperature is 150-160 ℃; and/or
Adding the composite drainage warm-mixing regenerant into new asphalt, heating and stirring to obtain drainage warm-mixing regenerated asphalt, wherein the stirring temperature is 160-180 ℃, and the stirring time is 1-2 min.
Further preferably, the further preparation of the reclaimed asphalt mixture for warm-mix drainage according to the mass ratio of the new aggregate to the reclaimed asphalt mixture required by the reclaimed asphalt mixture for warm-mix drainage comprises the following steps:
heating the new aggregate to 180-200 ℃;
heating the recycled asphalt mixture to 100-120 ℃;
and uniformly stirring the heated new aggregate and the recycled asphalt mixture, and further adding the drainage warm-mixed regenerated asphalt to uniformly stir to prepare the drainage warm-mixed regenerated asphalt mixture.
Further preferably, after the heating the recycled asphalt mixture to 100-120 ℃, the method further comprises: adding activated carbon and wood fiber.
In the preparation method of the drainage warm-mix recycled asphalt mixture, the mass ratio of the drainage warm-mix recycled asphalt to the drainage warm-mix recycled asphalt mixture is determined according to the original grading of the recycled asphalt mixture and the target grading of the drainage warm-mix recycled asphalt mixture; and determining the mass ratio of the new asphalt to the composite drainage warm-mix regenerant in the drainage warm-mix regenerated asphalt, determining the mass ratio of the new aggregate required for preparing the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture, and then sequentially preparing the composite drainage warm-mix regenerant and the drainage warm-mix regenerated asphalt mixture according to the determined proportion.
Drawings
The foregoing features, technical features, advantages and implementations of which will be further described in the following detailed description of the preferred embodiments in a clearly understandable manner in conjunction with the accompanying drawings.
FIG. 1 is a schematic flow chart of a preparation method of a drained warm mix reclaimed asphalt mixture according to the invention;
FIG. 2 is a graph of a recycling grading curve for a recycled asphalt mixture according to an embodiment of the present invention;
fig. 3 is a 20% milled material warm mix drainage reclaimed asphalt gradation curve in one example of the invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other drawings and embodiments may be devised by those skilled in the art without the use of inventive faculty.
As shown in fig. 1, a schematic flow chart of a preparation method of the reclaimed asphalt mixture with warm drain mix provided by the present invention is shown, and as can be seen from the schematic flow chart, the preparation method comprises: s10, obtaining a recycled asphalt mixture, and performing an extraction experiment on the recycled asphalt mixture to determine a recycling grading curve and the content of recycled asphalt in the recycled asphalt mixture; s20, determining the mass ratio of the drainage warm mix recycled asphalt to the drainage warm mix recycled asphalt according to the original grading of the recycled asphalt and the target grading of the drainage warm mix recycled asphalt; s30, determining the mass ratio of the new asphalt to the composite drainage warm-mix regenerant in the drainage warm-mix regenerated asphalt, and the mass ratio of the new aggregate to the recycled asphalt mixture required for preparing the drainage warm-mix regenerated asphalt mixture; s40, preparing the drainage warm-mix recycled asphalt according to the mass ratio of the drainage warm-mix recycled asphalt to the recycled asphalt mixture and the mass ratio of the new asphalt in the drainage warm-mix recycled asphalt to the composite drainage warm-mix recycling agent, and further preparing the drainage warm-mix recycled asphalt mixture according to the mass ratio of the new aggregate to the recycled asphalt mixture required by the drainage warm-mix recycled asphalt mixture.
In the preparation method of the drainage warm mix regeneration asphalt mixture, the preparation raw materials comprise a recovered asphalt mixture, new asphalt, new aggregate and the like, wherein the recovered asphalt mixture is a waste aged asphalt mixture which is used as a raw material for preparing the drainage warm mix regeneration asphalt mixture, so that the energy-saving and environment-friendly performance is improved, and the cost input is reduced; the new aggregate is a common mixture comprising coarse aggregate, fine aggregate, mineral powder and the like. After the recycled asphalt mixture is obtained, an extraction experiment is immediately carried out on the recycled asphalt mixture to determine a recycling grading curve and the content of recycled asphalt contained in the recycling grading curve, and the distribution condition of aggregate grain size particles at all levels in the recycled asphalt mixture, namely the original grading of the recycled asphalt mixture, is obtained. And then, determining the mass ratio of the drained warm-mixed regenerated asphalt to the drained warm-mixed regenerated asphalt according to the original grading of the reclaimed asphalt and the target grading of the drained warm-mixed regenerated asphalt, and further determining the mass ratio of the new asphalt to the composite drained warm-mixed regenerant in the drained warm-mixed regenerated asphalt and the mass ratio of the new aggregate required for preparing the drained warm-mixed regenerated asphalt to the reclaimed asphalt.
Specifically, the method for preparing the drainage warm-mixed recycled asphalt according to the mass ratio of the drainage warm-mixed recycled asphalt to the recycled asphalt and the mass ratio of the new asphalt to the composite drainage warm-mixed regenerant in the drainage warm-mixed recycled asphalt comprises the following steps: s41, mixing and stirring the surfactant and the warm-mixing agent uniformly to obtain a composite warm-mixing agent; s42, adding the regenerant, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent into the composite warm-mixing agent, and uniformly stirring to obtain the composite drainage warm-mixing regenerant; s43, adding the composite drainage warm-mixing regenerant into the new asphalt, heating and stirring to prepare the drainage warm-mixing regenerated asphalt.
In the preparation of the composite warm-mixing agent, the stirring temperature is 135-155 ℃, the stirring time is 5-10 min, and the warm-mixing agent accounts for 2-5% of the mass of the drainage warm-mixing regenerated asphalt mixture. In one embodiment, the warm-mix agent is
The warm-mixing agent, the surfactant are JNJ additives, the composite warm-mixing agent is 4% of the mass of the drainage warm-mixing recycled asphalt mixture, in other examples, the types of the warm-mixing agent and the surfactant can be selected according to specific situations, and are not limited specifically here. In addition, in the composite warm-mixing agent, the mass ratio of the surfactant to the warm-mixing agent can be adjusted according to practical application, for example, the mass fraction of the warm-mixing agent is 95-98%, and the mass fraction of the surfactant is 2-5%.
In the preparation of the composite drainage warm-mixing regenerant, the stirring temperature is 150-160 ℃, the stirring time is 6-10 min, and the mass of the composite drainage warm-mixing regenerant is 10-32% of the mass of the recycled asphalt in the recycled asphalt mixture. The mass fraction of the regenerant (the mass percentage of the regenerant in the regenerant, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent) is 60-75%, the mass fraction of the high-viscosity asphalt modifier RST is 20-35%, the mass fraction of the anti-aging agent is 1.5-2%, and the mass fraction of the fiber stabilizer is 2-3%. The regenerant should have strong permeability and fluidity, and certain heat resistance and aging resistance, such as aromatic oil; the anti-aging agent is one or mixture of RD and PB-2. When the anti-aging agent is a mixture of RD and PB-2, the mixing ratio between the RD and PB-2 can be set according to actual requirements, for example, the mass ratio is 1:1, and the like, which is not limited herein.
In the preparation of the drainage warm-mixed regenerated asphalt, the composite drainage warm-mixed regenerant is added into the new asphalt according to the determined mass ratio of the new asphalt to the composite drainage warm-mixed regenerant in the drainage warm-mixed regenerated asphalt, and the mixture is heated and stirred to prepare the drainage warm-mixed regenerated asphalt, wherein the stirring temperature is 160-180 ℃, and the stirring time is 1-2 min. The new asphalt is high viscosity modified asphalt.
Then, in the further preparation of the reclaimed asphalt mixture with warm-mixed drained water according to the mass ratio of the new aggregate to the reclaimed asphalt mixture needed by the reclaimed asphalt mixture with warm-mixed drained water, the method comprises the following steps:
heating the new aggregate to 180-200 ℃;
heating the recycled asphalt mixture to 100-120 ℃, and adding a certain amount of activated carbon and wood fiber. The amount of the activated carbon and the wood fiber can be adjusted according to the actual application conditions, such as 1-2% of the recycled asphalt mixture is added respectively, and the like.
And uniformly stirring the heated new aggregate and the recycled asphalt mixture, and further adding the drainage warm-mixed regenerated asphalt to uniformly stir to prepare the drainage warm-mixed regenerated asphalt mixture.
And finally, uniformly spreading the prepared warm-mixed recycled mixture on the road surface, rolling for 3 times by using a double-steel-wheel road roller and a rubber-wheel road roller respectively, and forming.
In one example, the test values for an old pavement from recycled asphalt mix and the original design requirements for that pavement are shown in table 1.
Table 1: old road surface detection value and original road surface design requirement
It can be seen from the table that the old road detection value can not meet the original road surface design requirement.
After the recycled asphalt mixture is obtained, an extraction experiment is carried out to determine a recycling grading curve as shown in fig. 2, wherein a design grading interval is represented between a curve A and a curve B; between the curve A and the curve B, the curve close to the curve A is a new road design value (corresponding to the target grading of the drainage warm-mixed recycled asphalt mixture), and the other curve represents an old road detection value (corresponding to the original grading of the recycled asphalt mixture). In each curve, the abscissa is the sieve pore, and the unit is mm; the ordinate is the throughput rate.
Determining the blending ratio of the old asphalt mixture to be 20% according to the original grading of the old asphalt mixture and the target grading of the prepared warm-mix drainage recycled asphalt mixture, and determining the grading composition curve of the warm-mix drainage recycled asphalt mixture according to the blending ratio as shown in fig. 3, wherein a curve C represents the upper grading limit, and a curve D represents the lower grading limit; between curve C and curve D, the curve near curve C represents the grading median, the other curve represents the grading curve for a 20% RAP mill.
Thereafter, the JNJ additive was added
Mixing the warm-mixing agents, stirring at 150 deg.C for 10min to obtain composite warm-mixing agent, and adding
The mass fraction of the warm mixing agent is 96%, the mass fraction of the JNJ additive is 4%, and the mass fraction of the prepared composite warm mixing agent is 4% of the mass of the drainage warm mixing recycled asphalt mixture.
Then, adding an aromatic oil regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent RD into the composite warm-mixing agent, and stirring for 10min at 150 ℃ to obtain the composite drainage warm-mixing regenerant. In the added regenerant, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent RD, the mass fraction of the aromatic oil regenerant is 66%, the mass fraction of the high-viscosity asphalt modifier RST is 30%, the mass fraction of the anti-aging agent RD is 2%, the mass fraction of the fiber stabilizer is 2%, and the mass of the prepared composite drainage warm-mixing regenerant is 30% of the mass of the recycled asphalt in the recycled asphalt mixture.
And then adding the composite drainage warm-mixing regenerant into the high-viscosity modified asphalt, heating and stirring to prepare drainage warm-mixing regenerated asphalt, wherein the stirring temperature is 160 ℃, and the stirring time is 2 min. The quality of the high-viscosity modified asphalt is determined according to the mass ratio of the new asphalt to the composite drainage warm-mixing regenerant in the obtained drainage warm-mixing regenerated asphalt.
Then, heating the new aggregate to 200 ℃; the recycled asphalt mixture was heated to 100 ℃ and 1% of the activated carbon and wood fiber of the recycled asphalt mixture were added each.
And then, uniformly stirring the heated new aggregate and the recycled asphalt mixture, further adding the drainage warm-mixed regenerated asphalt, and uniformly stirring to obtain the drainage warm-mixed regenerated asphalt mixture, wherein the detection values are shown in table 2.
Table 2: detection value in new construction
As can be seen from the table, the prepared drainage warm mix recycled asphalt mixture can basically meet the design requirements of the original pavement. And finally, uniformly spreading the prepared warm-mixed recycled mixture on the road surface, rolling for 3 times by using a double-steel-wheel road roller and a rubber-wheel road roller respectively, and forming.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be construed as the protection scope of the present invention.
Claims (8)
1. A preparation method of a drainage warm mix recycled asphalt mixture is characterized by comprising the following steps:
obtaining a recycled asphalt mixture, and performing an extraction experiment on the recycled asphalt mixture to determine a recycling grading curve and the content of recycled asphalt in the recycled asphalt mixture;
determining the mass ratio of the drainage warm-mixed recycled asphalt to the drainage warm-mixed recycled asphalt according to the original grading of the recycled asphalt and the target grading of the drainage warm-mixed recycled asphalt;
determining the mass ratio of the new asphalt to the composite drainage warm-mix regenerant in the drainage warm-mix regenerated asphalt, and determining the mass ratio of the new aggregate required for preparing the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture;
and preparing the drainage warm-mix regenerated asphalt according to the mass ratio of the drainage warm-mix regenerated asphalt to the recycled asphalt mixture and the mass ratio of the new asphalt in the drainage warm-mix regenerated asphalt to the composite drainage warm-mix regenerant, and further preparing the drainage warm-mix regenerated asphalt mixture according to the mass ratio of the new aggregate required by the drainage warm-mix regenerated asphalt mixture to the recycled asphalt mixture.
2. The method according to claim 1, wherein the step of preparing the drain warm-mixed reclaimed asphalt according to the mass ratio of the drain warm-mixed reclaimed asphalt to the reclaimed asphalt mixture and the mass ratio of the fresh asphalt to the composite drain warm-mixed regenerant in the drain warm-mixed reclaimed asphalt comprises the following steps:
mixing and stirring the surfactant and the warm-mixing agent uniformly to obtain a composite warm-mixing agent;
adding a regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent into the composite warm-mixing agent, and uniformly stirring to obtain a composite drainage warm-mixing regenerant;
and adding the composite drainage warm-mixing regenerant into new asphalt, heating and stirring to prepare the drainage warm-mixing regenerated asphalt.
3. Such as rightThe preparation method of claim 2, wherein the surfactant and the warm-mixing agent are mixed and stirred uniformly to obtain the composite warm-mixing agent
And the warm mixing agent is 2-5% of the mass of the drained warm-mixed recycled asphalt mixture.
4. The preparation method according to claim 2 or 3, characterized in that a regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent are added into the composite warm-mixing agent and are uniformly stirred to prepare the composite drainage warm-mixing regenerant, wherein the regenerant is aromatic oil, and the anti-aging agent is one or a mixture of RD and PB-2; and the mass of the composite drainage warm-mixing regenerant is 10-32% of the mass of the recycled asphalt in the recycled asphalt mixture.
5. The preparation method according to claim 4, wherein the composite warm-mix water recycling agent is prepared by adding the recycling agent, the high-viscosity asphalt modifier RST, the fiber stabilizer and the anti-aging agent into the composite warm-mix water recycling agent and uniformly stirring, wherein the mass fraction of the recycling agent is 60-75%, the mass fraction of the high-viscosity asphalt modifier RST is 20-35%, the mass fraction of the anti-aging agent is 1.5-2%, and the mass fraction of the fiber stabilizer is 2-3%.
6. The preparation method according to claim 2, 3 or 5, characterized in that the surfactant and the warm-mixing agent are mixed and stirred uniformly to obtain the composite warm-mixing agent, the stirring temperature is 135-155 ℃, and the stirring time is 5-10 min; and/or
Adding a regenerant, a high-viscosity asphalt modifier RST, a fiber stabilizer and an anti-aging agent into the composite warm-mixing agent, and uniformly stirring to obtain the composite drainage warm-mixing regenerant, wherein the stirring temperature is 150-160 ℃; and/or
Adding the composite drainage warm-mixing regenerant into new asphalt, heating and stirring to obtain drainage warm-mixing regenerated asphalt, wherein the stirring temperature is 160-180 ℃, and the stirring time is 1-2 min.
7. The preparation method according to claim 2, 3 or 5, characterized in that the further preparation of the reclaimed asphalt mixture for warm-mixing of drainage according to the mass ratio of the new aggregates to the reclaimed asphalt mixture required by the reclaimed asphalt mixture for warm-mixing of drainage comprises the following steps:
heating the new aggregate to 180-200 ℃;
heating the recycled asphalt mixture to 100-120 ℃;
and uniformly stirring the heated new aggregate and the recycled asphalt mixture, and further adding the drainage warm-mixed regenerated asphalt to uniformly stir to prepare the drainage warm-mixed regenerated asphalt mixture.
8. The method of claim 7, further comprising, after the heating the reclaimed asphalt mixture to 100 ℃ to 120 ℃: adding activated carbon and wood fiber.
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Address after: Room 1401, 8 Yincheng Middle Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200120 Applicant after: Shanghai Pudong Road & Bridge (Group) Co.,Ltd. Address before: Room 1401, 8 Yincheng Middle Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200120 Applicant before: SHANGHAI PUXING LUQIAO CONSTRUCTION ENGINERING Co.,Ltd. |
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Application publication date: 20200414 |
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