CN103254652A - Method for carrying out cold-recycling on waste asphalt mixture by taking aromatic oil as recycling agent - Google Patents
Method for carrying out cold-recycling on waste asphalt mixture by taking aromatic oil as recycling agent Download PDFInfo
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- CN103254652A CN103254652A CN2013101757226A CN201310175722A CN103254652A CN 103254652 A CN103254652 A CN 103254652A CN 2013101757226 A CN2013101757226 A CN 2013101757226A CN 201310175722 A CN201310175722 A CN 201310175722A CN 103254652 A CN103254652 A CN 103254652A
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Abstract
The invention relates to a method for carrying out cold-recycling on a waste asphalt mixture by taking aromatic oil as a recycling agent, which comprises the following steps: (1) according to the requirements of grading, crushing and screening the waste asphalt mixture; and (2) sequentially adding cement or fly ash, water, the recycling agent, and emulsified asphalt or foam asphalt into the waste asphalt mixture, and stirring the obtained product so as to obtain an emulsified asphalt cold-recycled mixture for laying roads, wherein the recycling agent is aromatic oil, and the adding amount of the aromatic oil accounts for 0.1-1wt% of the waste asphalt mixture. Compared with the prior art, the emulsified asphalt cold-recycled mixture obtained in the invention and subjected to compaction forming is lower in void ratio and better in integrity and durability, the performance of the emulsified asphalt cold-recycled mixture is improved, and the large-scale popularization and application of a cold-recycling technology for waste asphalt mixtures in the reconstruction of high-grade highways is facilitated.
Description
Technical field
The present invention relates to a kind of method that waste asphalt mixture is carried out cold regeneration, especially relate to a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, belong to the Road maintenance technical field.
Background technology
The high-grade highway that China builds has in early days progressed into the overhaul phase, and overhauling of road surface produced a large amount of waste asphalt mixtures, serious environment pollution in the time of the waste resource.Therefore reasonably the regeneration waste asphalt mixture is the very urgent task of Road maintenance technical field.Cold regeneration techniques is a kind of very important regeneration techniques, and it is new pitch, water etc. and waste asphalt to be mixed to stir at normal temperatures form the regenerating mixture with certain pavement performance, and making is to suitable road surface structare layer.At present, the cold regeneration of emulsified bitumen is because its technology is simple, the more excellent cold regeneration that forms to first-selection of performance.(voidage surpasses 12% after the compaction but the emulsified bitumen cold regeneration mix still has bigger voidage after abundant compacting, hot compaction after cold regeneration zone can be heated during the making hot-mix asphalt mixture, but still bigger voidage is arranged, generally surpass 10%).Bigger voidage causes the compound globality bad on the one hand, is difficult to when health is finished in the early stage take out complete core, influences the weather resistance of emulsified bitumen cold regeneration mix on the other hand.The basic reason that produces this problem is that present cold regeneration techniques regeneration level to the old pitch of waste asphalt mixture under the normal temperature situation is not high, also part was compatible with aged asphalt when the unfilled bitumen in the emulsified bitumen played cohesive action, but regeneration level is very low, cause that more small spaces is arranged in the waste asphalt mixture, in addition the normal temperature situation press down reality just caused compaction to finish to difficulty after voidage very high, although making heat can be carried out secondary compaction to cold regeneration zone when mixing layer, but still there is bigger voidage.The regeneration level that how to increase old pitch is the key that addresses this problem.
Pitch mainly is made up of bituminous matter, colloid, saturated part and fragrance part.Asphalt content has a significant impact the rheological characteristics of pitch, and pitch penetration degree and softening temperature that asphalt content is high are higher, and viscosity is bigger, and the more dark asphalt content of ageing of asphalt degree is more high.Fragrance part is given hydro carbons to other high scores and is had very strong dissolving power, and the viscosity of the fragrance part more high pitch of content is just more little.Therefore, select the fragrance part higher material of the content aged asphalt that dissolves, regenerates, will play important effect for the voidage that reduces the emulsified bitumen cold regeneration mix.Aromatic hydrocarbon oil namely is this material.Aromatic hydrocarbon oil also claims aromatic hydrocarbon or aromatic hydrocarbons, refers to contain in the molecule hydrocarbon polymer of benzene ring structure, and it is one of the basic product of petrochemical complex and basic material, mainly comprises benzene, toluene and dimethylbenzene, ethylbenzene etc.The aromatic hydrocarbon content of aromatic hydrocarbon oil is up to 70%～90%, and relative density 0.95～1.02 and pitch are suitable, and zero pour is convenient to construct under the normal temperature less than 5 ℃.So choose aromatic hydrocarbon oil as the regenerated additive of emulsified bitumen cold regeneration mix, to help the voidage that reduces compound.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil for the defective that overcomes above-mentioned prior art existence, voidage is lower behind the emulsified bitumen cold regeneration mix compaction moulding that this method obtains, and globality and weather resistance are better.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil, this method may further comprise the steps:
(1) by the grating requirement, with waste asphalt mixture fragmentation, screening;
(2) in waste asphalt mixture, add cement or flyash, water, regenerator and emulsified bitumen or foam asphalt successively, obtain can be used for the emulsified bitumen cold regeneration mix of road surface pavement after the stirring;
Described regenerator is aromatic hydrocarbon oil, and the add-on of this aromatic hydrocarbon oil is the 0.1wt%～1wt% of waste asphalt mixture.
Aromatic hydrocarbon oil claims fragrant hydrocarbon ils again, be rich in aromatic hydrocarbon, aged asphalt in the waste asphalt mixture there are certain dissolving, ramollescence, in the emulsified bitumen cold regeneration mix, add the pitch filling part slight void after a certain amount of aromatic hydrocarbon oil can make dissolving, softening old pitch also makes compound be convenient to compacting, the final voidage that reduces the emulsified bitumen cold regeneration mix increases globality, strengthens weather resistance.
Aromaticity content in the described aromatic hydrocarbon oil 〉=85%, ash content≤0.05%, moisture≤0.01%, zero pour＜5 ℃, flash-point 〉=220 ℃, zero pour is lower than 5 ℃ and is convenient to construct at normal temperatures.
Aromatic hydrocarbon oil has certain viscosity under the normal temperature, is not easy to feed intake, and therefore, for ease of accurately feeding intake and stirring, the adding temperature of described aromatic hydrocarbon oil is 60～70 ℃.
Total add-on of described water, regenerator and emulsified bitumen is the 4wt%～6wt% of waste asphalt mixture.
Total add-on of described water, regenerator and emulsified bitumen is preferably the 4.8wt% of waste asphalt mixture.
Under the identical emulsified bitumen consumption situation, emulsified bitumen cold regeneration mix than independent use emulsified bitumen, the interpolation aromatic hydrocarbon oil can reduce the intensity of emulsified bitumen cold regeneration mix slightly, have higher requirements as the intensity to the emulsified bitumen cold regeneration mix, can increase the volume of cement isoreactivity filler in right amount, because the adding of aromatic hydrocarbon oil, the active filler consumption of increase can't obviously increase the rigidity of compound; Guaranteeing under the situation that the compound weather resistance does not reduce, add aromatic hydrocarbon oil and can reduce the emulsified bitumen consumption, generally can reduce optimum emulsification asphalt content 0.5～1.0%, the loss of compound intensity can remedy by little mud consumption of surging, and can reduce investment outlay in engineering should be just; By adding regenerator, the add-on that reduces water can shorten the conditioned time of emulsified bitumen cold regeneration mix in the road surface pavement process.
The add-on of described cement or flyash is the 0.5wt%～2wt% of waste asphalt mixture.
Described cement or flyash, water, regenerator and emulsified bitumen or the foam asphalt of in waste asphalt mixture, adding successively of step (2), the concrete steps of emulsified bitumen cold regeneration mix that obtain can be used for road surface pavement after the stirring are as follows:
(a) cement or flyash are joined in the waste asphalt mixture dry mixing 25～35s;
(b) in step (a) gains, add water, stir 50～70s;
(c) aromatic hydrocarbon oil is heated to 60～70 ℃, joins in step (b) gains, stir 50～70s;
(d) emulsified bitumen or foam asphalt are joined in step (e) gains, stir 50～70s.
The emulsified bitumen cold regeneration mix that the present invention is obtained transports workyard decking and rolling moulding immediately to.
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) voidage is lower behind the emulsified bitumen cold regeneration mix compaction moulding of admixture aromatic hydrocarbon oil, and globality is better;
(2) behind the emulsified bitumen cold regeneration mix compaction moulding of admixture aromatic hydrocarbon oil better weather resistance is arranged;
(3) the present invention reduces water consumption by adding aromatic hydrocarbon oil as regenerator, shortens curing time, and is more favourable to the traffic organization of highway major maintenance;
(4) the present invention can suitably reduce the emulsified bitumen consumption by adding aromatic hydrocarbon oil as regenerator according to performance requriements, saves cost;
(5) method of the present invention is simple to operate, is convenient to Large scale construction and uses.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment 1～3
Select certain Expressway Asphalt layer waste asphalt mixture and Shanghai petrochemical plant aromatic hydrocarbon oil for use.
Waste asphalt mixture is divided into 0-5mm, and 5-15mm and 15-30mm three big shelves recommend grading limit to carry out the grating design according to domestic and international cold regeneration mix, and cement mixing content is 1.5% of waste asphalt mixture quality.Admixture emulsified bitumen not among the embodiment 1～3, only admixture aromatic hydrocarbon oil and water illustrate the effect of aromatic hydrocarbon oil by the mixture performance before and after the contrast admixture aromatic hydrocarbon oil.Optimal liquid (being aromatic hydrocarbon oil and the water) consumption of determining waste asphalt mixture according to geotechnological compaction test is 4.8%.
The stirring at normal temperature method of cold regeneration mix is: 1. waste asphalt mixture and cement dry mixing are 30 seconds; 2. added the water wet-mixing 60 seconds; 3. adding aromatic hydrocarbon oil stirred 60 seconds.
The forming method of shop experiment marshal piece is: cold regeneration mix two-sided respectively hitting real 100 times on the Marshall shaper that elder generation finishes stirring at normal temperatures, and be with the mould room temperature to be sidelong 24h then; Test specimen band die side is put into 60 ℃ of convection oven health 48h; The test specimen that health is finished carries out secondary and hits reality under 60 ℃, two-sided each 50 times, leave standstill the above demoulding of 12h then.
Among embodiment 1～embodiment 3: to adding mineral aggregate quality 0.0%, 1.0%, 2.0% aromatic hydrocarbon oil in the cold regeneration mix respectively, test-results sees Table 1.
Table 1 does not add cold regeneration mix performance comparison under the different aromatic hydrocarbon oil volumes of emulsified bitumen
The admixture of aromatic hydrocarbon oil can reduce the voidage of cold regeneration mix greatly as shown in Table 1, improves the water stability of compound.15 ℃ of cleavage strengths present increases the trend that afterwards reduces earlier, and 60 ℃ of Marshall stabilitys then reduce along with the increase of aromatic hydrocarbon oil consumption.When the basic unit of low-grade highway carries out cold reengineer, can not use emulsified bitumen, only use the aromatic hydrocarbon oil about 1.0% namely can make the cold regeneration mix that performance meets the demands.
Embodiment 4～6
Select certain Expressway Asphalt layer waste asphalt mixture and Shanghai petrochemical plant aromatic hydrocarbon oil for use.The emulsified bitumen that uses is produced as the real big gram of virtue dimension company, wherein contains 62.0% plain asphalt, 38.0% the aqueous solution.
Waste asphalt mixture is divided into 0-5mm, 5-15mm and 15-30mm three big shelves, recommend grading limit to carry out the grating design according to domestic and international cold regeneration mix, cement mixing content is respectively 1.5% and 2.0% of mineral aggregate quality, determines that according to geotechnological compaction test optimal liquid (being aromatic hydrocarbon oil, emulsified bitumen and the water) consumption of waste asphalt mixture is 4.8%.
The stirring at normal temperature method of cold regeneration mix is: 1. waste asphalt mixture and cement dry mixing are 30 seconds; 2. added the water wet-mixing 60 seconds; 3. adding aromatic hydrocarbon oil stirred 60 seconds; Adding emulsified bitumen stirred 60 seconds.
The forming method of shop experiment marshal piece is: cold regeneration mix two-sided respectively hitting real 100 times on the Marshall shaper that elder generation finishes stirring at normal temperatures, and be with the mould room temperature to be sidelong 24h then; Test specimen band die side is put into 60 ℃ of convection oven health 48h; The test specimen that health is finished carries out secondary and hits reality under 60 ℃, two-sided each 50 times, leave standstill the above demoulding of 12h then.
Among the embodiment 4～6: to adding emulsified bitumen, aromatic hydrocarbon oil and the cement of different amounts in the cold regeneration mix respectively.The water stability of check cold regeneration mix adopts the freeze thawing split test.Test-results sees Table 2.
Cold regeneration mix performance comparison under the different aromatic hydrocarbon oil of table 2 and the cement mixing content
As shown in Table 2, adding the voidage that 0.7% aromatic hydrocarbon oil can reduce the emulsified bitumen cold regeneration mix reaches more than 2.0%; Significantly improved cold regeneration mix opposing damage by water evil ability simultaneously.The interpolation of 0.7% aromatic hydrocarbon oil slightly descends the intensity of compound, but still much larger than the requirement of the minimum 0.5MPa of specifications recommend; The cement mixing content of increase by 0.5% can further improve the water stability of cold regeneration mix, and reduces because adding aromatic hydrocarbon oil to the reduction amplitude of cold regeneration mix cleavage strength.
Embodiment 7
A kind of method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil, this method may further comprise the steps:
(1) by the grating requirement, with waste asphalt mixture fragmentation, screening;
(2) add cement or flyash, water, aromatic hydrocarbon oil and emulsified bitumen or foam asphalt successively in waste asphalt mixture, obtain can be used for the emulsified bitumen cold regeneration mix of road surface pavement after the stirring, concrete steps are as follows:
(a) cement or flyash are joined in the waste asphalt mixture dry mixing 30s;
(b) in step (a) gains, add water, stir 60s;
(c) aromatic hydrocarbon oil is heated to 60 ℃, joins in step (b) gains, stir 60s;
(d) emulsified bitumen or foam asphalt are joined in step (c) gains, stir 60s.
In the step (2), the add-on of aromatic hydrocarbon oil is the 0.8wt% of waste asphalt mixture, and total add-on of water, regenerator and emulsified bitumen is the 4.8wt% of waste asphalt mixture; The add-on of cement or flyash is the 1wt% of waste asphalt mixture.
The emulsified bitumen cold regeneration mix that the present invention is obtained transports workyard decking and rolling moulding immediately to.
Embodiment 8
Plant the method for as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil, this method may further comprise the steps:
(1) by the grating requirement, with waste asphalt mixture fragmentation, screening;
(2) add cement or flyash, water, aromatic hydrocarbon oil and emulsified bitumen or foam asphalt successively in waste asphalt mixture, obtain can be used for the emulsified bitumen cold regeneration mix of road surface pavement after the stirring, concrete steps are as follows:
(a) cement or flyash are joined in the waste asphalt mixture dry mixing 25s;
(b) in step (a) gains, add water, stir 50s;
(c) aromatic hydrocarbon oil is heated to 65 ℃, joins in step (b) gains, stir 50s;
(d) emulsified bitumen or foam asphalt are joined in step (e) gains, stir 50s.
In the step (2), the add-on of aromatic hydrocarbon oil is the 0.1wt% of waste asphalt mixture, and total add-on of water, regenerator and emulsified bitumen is the 4wt% of waste asphalt mixture; The add-on of cement or flyash is the 0.5wt% of waste asphalt mixture.
The emulsified bitumen cold regeneration mix that the present invention is obtained transports workyard decking and rolling moulding immediately to.
Embodiment 9
A kind of method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil, this method may further comprise the steps:
(1) by the grating requirement, with waste asphalt mixture fragmentation, screening;
(2) add cement or flyash, water, aromatic hydrocarbon oil and emulsified bitumen or foam asphalt successively in waste asphalt mixture, obtain can be used for the emulsified bitumen cold regeneration mix of road surface pavement after the stirring, concrete steps are as follows:
(a) cement or flyash are joined in the waste asphalt mixture dry mixing 35s;
(b) in step (a) gains, add water, stir 70s;
(c) aromatic hydrocarbon oil is heated to 70 ℃, joins in step (b) gains, stir 70s;
(d) emulsified bitumen or foam asphalt are joined in step (c) gains, stir 70s.
In the step (2), the add-on of aromatic hydrocarbon oil is the 1wt% of waste asphalt mixture, and total add-on of water, regenerator and emulsified bitumen is the 6wt% of waste asphalt mixture; The add-on of cement or flyash is the 2wt% of waste asphalt mixture.
The emulsified bitumen cold regeneration mix that the present invention is obtained transports workyard decking and rolling moulding immediately to.
Claims (7)
1. method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil, this method may further comprise the steps:
(1) by the grating requirement, with waste asphalt mixture fragmentation, screening;
(2) in waste asphalt mixture, add cement or flyash, water, regenerator and emulsified bitumen or foam asphalt successively, obtain can be used for the emulsified bitumen cold regeneration mix of road surface pavement after the stirring;
It is characterized in that described regenerator is aromatic hydrocarbon oil, the add-on of this aromatic hydrocarbon oil is the 0.1wt%～1wt% of waste asphalt mixture.
According to claim 1 a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, it is characterized in that aromaticity content in the described aromatic hydrocarbon oil 〉=85%, ash content≤0.05%, moisture≤0.01%.
According to claim 1 a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, it is characterized in that the adding temperature of described aromatic hydrocarbon oil is 60～70 ℃.
According to claim 1 a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, it is characterized in that total add-on of described water, regenerator and emulsified bitumen is the 4wt%～6wt% of waste asphalt mixture.
According to claim 4 a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, it is characterized in that total add-on of described water, regenerator and emulsified bitumen is preferably the 4.8wt% of waste asphalt mixture.
According to claim 1 a kind of with aromatic hydrocarbon oil as regenerator to the method that waste asphalt mixture carries out cold regeneration, it is characterized in that the add-on of described cement or flyash is the 0.5wt%～2wt% of waste asphalt mixture.
7. a kind of method of as regenerator waste asphalt mixture being carried out cold regeneration with aromatic hydrocarbon oil according to claim 1, it is characterized in that, described cement or flyash, water, regenerator and emulsified bitumen or the foam asphalt of in waste asphalt mixture, adding successively of step (2), the concrete steps of emulsified bitumen cold regeneration mix that obtain can be used for road surface pavement after the stirring are as follows:
(a) cement or flyash are joined in the waste asphalt mixture dry mixing 25～35s;
(b) in step (a) gains, add water, stir 50～70s;
(c) aromatic hydrocarbon oil is heated to 60～70 ℃, joins in step (b) gains, stir 50～70s;
(d) emulsified bitumen or foam asphalt are joined in step (c) gains, stir 50～70s.
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Cited By (9)
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| CN103613943A (en) * | 2013-12-17 | 2014-03-05 | 海南大学 | Hot mix asphalt recycling agent as well as preparation method and application thereof |
| CN104359731A (en) * | 2014-11-04 | 2015-02-18 | 沈阳建筑大学 | Indoor test compaction forming method for emulsified asphalt cold in-plant recycling regenerated mixture |
| CN106633950A (en) * | 2016-09-19 | 2017-05-10 | 武汉理工大学 | Dry blending method waste rubber powder modified waste vegetable oil thermal regeneration asphalt mixture and preparation method thereof |
| CN106883629A (en) * | 2017-04-18 | 2017-06-23 | 无锡市城市道桥科技有限公司 | A kind of preparation method of warm mix regeneration asphalt |
| CN106927731A (en) * | 2017-03-07 | 2017-07-07 | 上海浦兴路桥建设工程有限公司 | A kind of morning strong high-durability cold recycled asphalt mixture and preparation method thereof |
| CN107129695A (en) * | 2017-05-18 | 2017-09-05 | 江苏道润工程技术有限公司 | The Emulsified Asphalt Mixture of cold in place recycling and cold in place recycling road surface |
| CN107324693A (en) * | 2017-06-15 | 2017-11-07 | 广州市市政集团有限公司 | A kind of cold recycled asphalt mixture and preparation method thereof |
| CN113816674A (en) * | 2021-09-03 | 2021-12-21 | 山西交通养护集团有限公司 | Recycled cement concrete with recycled waste asphalt and preparation method and application thereof |
| CN115504718A (en) * | 2022-10-17 | 2022-12-23 | 广州公路工程集团有限公司 | Regeneration method of asphalt mixture |
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Cited By (10)
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|---|---|---|---|---|
| CN103613943A (en) * | 2013-12-17 | 2014-03-05 | 海南大学 | Hot mix asphalt recycling agent as well as preparation method and application thereof |
| CN104359731A (en) * | 2014-11-04 | 2015-02-18 | 沈阳建筑大学 | Indoor test compaction forming method for emulsified asphalt cold in-plant recycling regenerated mixture |
| CN106633950A (en) * | 2016-09-19 | 2017-05-10 | 武汉理工大学 | Dry blending method waste rubber powder modified waste vegetable oil thermal regeneration asphalt mixture and preparation method thereof |
| CN106927731A (en) * | 2017-03-07 | 2017-07-07 | 上海浦兴路桥建设工程有限公司 | A kind of morning strong high-durability cold recycled asphalt mixture and preparation method thereof |
| CN106927731B (en) * | 2017-03-07 | 2019-05-07 | 上海浦兴路桥建设工程有限公司 | A kind of morning strong high-durability cold recycled asphalt mixture and preparation method thereof |
| CN106883629A (en) * | 2017-04-18 | 2017-06-23 | 无锡市城市道桥科技有限公司 | A kind of preparation method of warm mix regeneration asphalt |
| CN107129695A (en) * | 2017-05-18 | 2017-09-05 | 江苏道润工程技术有限公司 | The Emulsified Asphalt Mixture of cold in place recycling and cold in place recycling road surface |
| CN107324693A (en) * | 2017-06-15 | 2017-11-07 | 广州市市政集团有限公司 | A kind of cold recycled asphalt mixture and preparation method thereof |
| CN113816674A (en) * | 2021-09-03 | 2021-12-21 | 山西交通养护集团有限公司 | Recycled cement concrete with recycled waste asphalt and preparation method and application thereof |
| CN115504718A (en) * | 2022-10-17 | 2022-12-23 | 广州公路工程集团有限公司 | Regeneration method of asphalt mixture |
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