• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Asphalt mix composition obtained from recovered asphalt pavement (RAP), comprising recycled polymer in an amount of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) included in the mix. The process for obtaining said asphalt mixture from recovered asphalt pavement (RAP) is also an object of the invention. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2786851A1
    申请号:ES201930334
    申请日:2019-04-12
    公开日:2020-10-13
    发明作者:Arrue Antonio Chacon
    申请人:Investig Y Desarrollos Discovery S L；
    IPC主号:
    专利说明:

    [0001] COMPOSITION OF ASPHALT MIX AND ITS OBTAINING PROCEDURE
    [0003] TECHNICAL FIELD OF THE INVENTION
    [0005] The present invention is encompassed in the field of construction materials, specifically, with construction materials used in the asphalting of highways, roads, streets, or similar surfaces.
    [0007] A first object of the invention refers to an asphalt mix composition obtained from recovered asphalt pavement, known as "RAP" for its acronym in English ( Reclaimed Asphalt Pavement), that is, it refers to the reuse of rubble resulting from the "milling" of the tread layer of a highway, road, street, or similar surface, to be re-asphalted.
    [0009] A second object of the invention relates to the procedure for obtaining the asphalt mixture from recovered asphalt pavement (RAP).
    [0011] BACKGROUND OF THE INVENTION
    [0013] Solutions are known that improve asphalt mixtures by adding virgin polymers to the bitumen of said mixture. In these known solutions, once the bitumen-polymer mixture is homogenized, the latter is mixed with the aggregates, giving rise to the so-called "polymer-modified asphalt" or PMA for its acronym in English.
    [0015] These asphalts have proven to have superior characteristics and quality than unmodified asphalt. Polymers are known to have a solubility of 3 to 20% by weight of bitumen, which, in said percentage range, forms a homogeneous mixture that shows better properties with respect to softening point, penetration values and ductility. The softening point increases, the penetration value decreases, which suggests that this mixture is suitable for the asphalting of highways, roads, streets and similar surfaces.
    [0016] However, the addition of virgin polymers causes the asphalt to become more expensive, which leads to these superior quality asphalts being used only in short sections where the need for their use is justified. In addition, this type of asphalt does not contribute to solving the problem of recycling polymeric materials that is so much needed today.
    [0018] Polymers, commonly known as plastics, are used in many ways in our daily lives. Although its controlled use is important, so is its reuse or recycling, avoiding the damage caused by its disposal to the ecosystem.
    [0020] Today, the point has been reached where recycling of polymer waste is an absolute necessity for our society. We are inundated with plastic waste, such as bags, cups and other types of packaging, solid foam, etc., made of, for example, polyethylene (PE), polypropylene (PP), polystyrene (PS) and polyvinyl chloride (PVC) , which, for the most part, end up being buried polluting the land, burned, generating atmospheric pollution, or, polluting our seas, negatively affecting marine fauna.
    [0022] On the other hand, it is also known to reuse the rubble from the "milling" of the tread layer (recovered asphalt pavement (RAP)) of highways, roads, streets and similar surfaces, in asphalt mixtures for resurfacing. In these solutions, although resources are recycled: aggregates and aged bitumen, it is necessary to use expensive "rejuvenating" additives for the rubble bitumen, which makes it difficult and more expensive to use, as well as limiting the amount of recovered asphalt pavement ( RAP) in the final asphalt mix.
    [0024] Therefore, it is necessary to obtain, in a simple and economical way, an asphalt mixture that allows the effective and efficient use of recovered asphalt pavement (RAP) in the asphalt of highways, roads, streets and similar surfaces, and at the same time, allows recycling polymer waste, eg polyethylene (PE), polypropylene (PP) and polystyrene (PS).
    [0026] DESCRIPTION OF THE INVENTION
    [0027] The present invention is established and characterized in the independent claims, while the dependent claims describe other characteristics thereof.
    [0029] The object of the invention is an asphalt mixture composition obtained from recovered asphalt pavement (RAP). Likewise, the object of the invention is a process for obtaining said asphalt mixture.
    [0031] As mentioned, the asphalt mix composition is obtained from recovered asphalt pavement (RAP), and has the novelty that it also comprises recycled polymer in an amount of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement. (RAP) included in the mix.
    [0033] For its part, its obtaining procedure includes the following stages:
    [0034] a) Obtain a quantity of recovered asphalt pavement (RAP),
    [0035] b) Obtain a quantity of recycled polymer, in a proportion of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) obtained in step a),
    [0036] c) Grinding the recycled polymers obtained in step b),
    [0037] d) Heating the recycled polymers crushed in step c) until reaching a temperature of between 155oC and 165oC,
    [0038] e) Heat the amount of recovered asphalt pavement (RAP) obtained in stage a) until reaching a temperature between 160oC and 170oC.
    [0039] f) Add the recycled polymers heated in stage d) on the recovered asphalt pavement (RAP) heated in stage e),
    [0040] g) Mix the recovered asphalt pavement (RAP) with the recycled polymers until reaching a homogeneous mixture, maintaining a temperature between 155oC and 162oC,
    [0041] h) Supply the mixture obtained in step g) at a temperature between 100oC and 140oC, which is suitable for use as an asphalt mixture.
    [0043] Thus, with the addition of the recycled polymer in the recovered asphalt pavement-based asphalt mix (RAP), the “rejuvenation” of the aged bitumen contained in the latter is achieved without representing a high manufacturing cost of the asphalt mix, which, can be formed with a greater amount of asphalt pavement recovered (RAP) which, in addition to improving the technical characteristics of the resulting asphalt compared to known asphalt mixtures (the value obtained from the “Marshall Test” turns out to be 2.5 times higher and there is no “Stripping”, even after 72 hours), significantly reduces its economic cost, making it especially attractive for the resurfacing of highways, roads, streets and similar surfaces, in addition to dramatically improving the environmental impact by reusing polymer waste and asphalt debris, fulfilling the long-awaited criteria of the circular economy and needed today.
    [0045] Likewise, the application of the asphalt mixture of the present invention implies great advantages, especially in certain geographical areas whose climatic conditions require lower penetration properties of the asphalt, and likewise, the mixture reduces the appearance of cracks in the road of the highway, highway, street or similar surface. Likewise, it shows greater resistance to water and the formation of potholes is significantly reduced.
    [0047] DETAILED EXHIBITION OF THE INVENTION
    [0049] The present invention is an asphalt mixture composition obtained from recovered asphalt pavement (RAP), which additionally comprises recycled polymer in an amount of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) included. in the mix.
    [0051] Preferably, the recycled polymer is selected from the group consisting of polystyrene (PS), polypropylene (PP), and polyethylene (PE), or any combination of these.
    [0053] The asphalt mixture of recovered asphalt pavement (RAP) and recycled polymer could be used alone to re-asphalt highways, roads, streets or similar surface; Or, additionally, said mixture could comprise virgin asphalt (mixture of aggregates and virgin bitumen), the latter, in a proportion of between 0.5% and 66% by weight with respect to the weight of the recovered asphalt pavement (RAP) and recycled polymer included in the asphalt mix (that is, up to 40% of the total weight of the final asphalt mix obtained).
    [0054] In both cases, not only is there a higher quality asphalt mix, but given the high number of kilometers of expressways, roads, streets and similar surfaces that are re-asphalted each year, the present invention helps to solve the problem. from the recycling of most of the plastics we dispose of and the debris resulting from the "milling" of the old tread layer, using them in the re-asphalting of highways, roads, streets, and similar surfaces, contributing significantly to the resolution of one of today's most pressing environmental problems.
    [0056] On the other hand, the process for obtaining the asphalt mixture, which is also the object of the present invention, starts from obtaining a quantity of recovered asphalt pavement (RAP), and a quantity of recycled polymer, the latter, in a proportion between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) obtained. The exact amount of recycled polymer to add will depend on the nature of the surface to be prepared. For example, for surfaces in which virgin asphalt, prepared with 60/70 bitumen, is added to the asphalt mixture, it will be possible to reach up to 2% of recycled polymer, reducing to 1.75% in the case of asphalt mixtures that include asphalt. virgin prepared with 80/100 bitumen, and so on, progressively. For surfaces where virgin asphalt is not added to the asphalt mixture, for example, the proportion of recycled polymer could be between 0.5% and 0.8% by weight with respect to the weight of the recovered asphalt pavement (RAP).
    [0058] The amount of recovered asphalt pavement (RAP) obtained, advantageously, can be the rubble itself resulting from removing the tread layer from the highway, highway, street or similar surface to be re-asphalted.
    [0060] For its part, preferably, obtaining the amount of recycled polymers is based on segregating and drying plastic waste such as bags, glasses and other similar containers, thermal protection, etc., made of recycled polymers selected from the group consisting of polystyrene (PS ), polypropylene (PP) and polyethylene PE), or any combination of these; discarding plastic waste made of polyvinyl chloride (PVC).
    [0061] Subsequently, the quantity of recycled polymers obtained (segregated and dried) are shredded, preferably, into pieces of sizes less than 35 mm.
    [0063] Subsequently, the crushed recycled polymers are heated to a temperature between 155oC and 165oC. Preferably, while heating, said recycled polymers are removed to obtain a homogeneous fluid from them.
    [0065] Likewise, the amount of recovered asphalt pavement (RAP) obtained previously is heated until reaching a temperature of between 160oC and 170oC, to then add uniformly on said amount of recovered asphalt pavement (RAP) the homogeneous fluid of recycled polymers obtained from heating the latter previously.
    [0067] The addition of the homogeneous fluid of recycled polymers to the recovered asphalt pavement (RAP) causes two complementary effects: on the one hand, it improves the characteristics of the aged bitumen existing in the recovered asphalt pavement (RAP), that is, it “rejuvenates” it, and on the other hand On the other hand, it waterproofs those parts of the existing aggregates in said recovered asphalt pavement (RAP) that were not covered by bitumen when the highway, road, street or similar surface was asphalted the previous time. In this way, in an efficient and effective way, the characteristics of the asphalt mixture obtained are radically improved, instead of having to add expensive rejuvenators or softening agents, as occurs in currently known solutions in which it is re-used. Recovered Asphalt Pavement (RAP).
    [0069] Then, the recovered asphalt pavement (RAP) and the recycled polymer homogeneous fluid are mixed, for example, in a mixing drum, until an equally homogeneous mixture is reached between both ingredients, maintaining a mixture temperature of between 155oC and 162oC.
    [0071] Likewise, to the mixture of recovered asphalt pavement (RAP) (mixture of aggregates and aged bitumen) and recycled polymer (rejuvenator of aged bitumen), virgin asphalt (mixture of aggregates and virgin bitumen) can be added, the latter, in a proportion of between 0.5% and 66% by weight with respect to the weight of said mixture of recovered asphalt pavement (RAP) and recycled polymer (that is, up to 40% of the total weight of the final asphalt mixture obtained).
    [0073] Next, after a homogeneous mixture has been obtained, either of recovered asphalt pavement (RAP) and recycled polymer, or of recovered asphalt pavement (RAP), recycled polymer and virgin asphalt, said mixture is withdrawn from the mixing drum to a temperature of approximately 140oC, and it is supplied at a temperature between 100oC and 140oC to be used as an asphalt mixture in the re-asphalt of the highway, highway, street or similar surface in question.
    [0075] The adhesion and ductility characteristics of the aged bitumen of the recovered asphalt pavement (RAP), improved with the addition of the recycled polymer, help to improve the quality of the roadway, highway, street or similar surface, in terms of supporting greater load, abrasion, prevents "bleeding" and improves water resistance. In other words, it is possible to build an improved highway, highway, street or similar surface, with technical characteristics superior to those formed with conventional asphalt mixtures, reducing the economic cost of the same and drastically improving the environmental impact by reusing plastics and debris generated in the re-asphalting of said highway, road, street, or similar surface, while reducing the footprint of CO 2 .
    权利要求:
    Claims (9)
    [1]
    1. - Composition of asphalt mixture obtained from recovered asphalt pavement (RAP), characterized in that it comprises recycled polymer in an amount of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) included in the mixture .
    [2]
    2. - Composition according to claim 1, in which the recycled polymer is selected from the group consisting of polystyrene (PS), polypropylene (PP) and polyethylene (PE), or any combination of these.
    [3]
    3. - Composition according to claim 1, which additionally comprises virgin asphalt in a proportion of between 0.5% and 66% by weight with respect to the weight of the recovered asphalt pavement (RAP) and recycled polymer included in the mixture.
    [4]
    4. - Procedure for obtaining asphalt mixture from recovered asphalt pavement (RAP) that comprises the following stages:
    a) Obtain a quantity of recovered asphalt pavement (RAP),
    b) Obtain a quantity of recycled polymer, in a proportion of between 0.5% and 2% by weight with respect to the weight of the recovered asphalt pavement (RAP) obtained in step a),
    c) Grinding the recycled polymers obtained in step b),
    d) Heating the recycled polymers crushed in step c) until reaching a temperature of between 155oC and 165oC,
    e) Heat the amount of recovered asphalt pavement (RAP) obtained in stage a) until reaching a temperature between 160oC and 170oC.
    f) Add the recycled polymers heated in stage d) on the recovered asphalt pavement (RAP) heated in stage e),
    g) Mix the recovered asphalt pavement (RAP) with the recycled polymers until reaching a homogeneous mixture, maintaining a temperature between 155oC and 162oC,
    h) Supply the mixture obtained in step g) at a temperature between 100oC and 140oC, suitable for use as an asphalt mix.
    [5]
    5. - Process according to claim 4, in which step b) includes the steps of segregating and drying the recycled polymers, where the recycled polymers are selected from the group consisting of polystyrene (PS), polypropylene (PP) and polyethylene PE ), or any combination of these.
    [6]
    6. - Process according to claim 4, in which, in step c), the recycled polymers are crushed into pieces of sizes less than 35 mm.
    [7]
    7.
    [8]
    8. - Process according to claim 4, in which the mixing of step g) is carried out in a mixing drum.
    [9]
    9.- Process according to claims 4 or 8, in which, in step g), virgin asphalt is added to the mixture of recovered asphalt pavement (RAP) and recycled polymer in a proportion of between 0.5% and 66% by weight with respect to the weight of said mixture of recovered asphalt pavement (RAP) and recycled polymer.
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    同族专利:
    公开号 | 公开日
    ES2786851B2|2021-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    ES2061658T3|1987-07-15|1994-12-16|Exxon Research Engineering Co|IMPROVED ASPHALTS MODIFIED WITH POLYETHYLENE.|
    ES2389617T3|2009-07-23|2012-10-29|Eni S.P.A.|Procedure for the preparation of an asphalt mixture that has high processability|
    CN102827483A|2011-06-15|2012-12-19|董久雷|Reduction-state road composite material|
    CN107216665A|2017-07-24|2017-09-29|广东诚泰投资有限公司|A kind of modified pitch and preparation method thereof|
    法律状态:
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