KR102307082B1 - Recycled medium temperature modified asphalt mixture from recycled waste resources - Google Patents

Abstract

The present invention relates to a waste resource recycled recycling warm-mix modified asphalt mixture which prepares a use aggregate for an asphalt mixture by inputting a recycling aggregate and a natural aggregate, prepares a binder by mixing a polymer material-based modification additive and a warm-mix additive with asphalt in a dry or wet method, mixes the binder having warm-mix modification properties with the use aggregate to be used. The use aggregate (A1) is prepared by comprising coarse aggregate and fine aggregate as the natural aggregate, waste asphalt concrete and waste glass material as recycled aggregate, and a filling material for asphalt pavement. The modification warm-mix binder (A2) is prepared by comprising a novel material asphalt, an old material asphalt of the recycling aggregate for asphalt concrete, and a warm-mix additive based on sulfur polymer. A functional additive and waste tire micro powder are mixed in the modification warm-mix binder (A2). The modification warm-mix binder (A2) is mixed in the use aggregate (A1) to be used.

Description

Recycled medium temperature modified asphalt mixture from recycled waste resources

The present invention relates to a circulating medium-temperature reformed asphalt mixture in which waste resources such as waste plastics, waste glass, waste asphalt, and sulfur by-products are recycled, and more particularly, recycled aggregate obtained by crushing waste glass material and waste asphalt into natural aggregate and Prepare the aggregate used for the asphalt mixture by inputting it, and add the polymer material modifier made by crushing the waste plastic and the pelletized medium temperature additive including paraffin wax, EB wax, stearic acid, oil, and slaked lime to the asphalt by dry or wet method It relates to a circulating medium-temperature reforming asphalt mixture in which waste resources are recycled to prepare a binder by mixing and manufacturing the binder, and to mix the binder with the medium-temperature modifying property with the aggregate to be used in a dry or wet manner.

In general, modified asphalt, which is emerging for suppressing plastic deformation of asphalt, is generally obtained by adding a certain amount of modifier to the existing asphalt to improve the physical properties of the asphalt. Since the plastic deformation of asphalt is mainly damage to the asphalt road pavement at high temperatures, it should have a higher viscosity at high temperatures. The modified asphalt used in Korea includes SMA (Stone Mastic Asphalt), SBSPMA (Styrene Butadiene Styrene Polymer Modified Asphalt), CRM (Crumb Rubber Modifier), PBS (Phoenix Bituminous Stabilizer), etc. Research on modified asphalt is being actively conducted.

Meanwhile, according to the 「Act on the Promotion of Recycling of Construction Wastes」 in 2005, the duty to recycle construction wastes such as soil, concrete and asphalt concrete that are discharged in excess of a certain scale was announced, but most still rely on simple landfill. There is an urgent need to improve the technical, economic and institutional conditions for effective recycling.

Recently, the Ministry of Environment is planning to raise 13% of the amount of waste asphalt generated by 2011 to the level of advanced countries (more than 50%) by 2020 with recycled asphalt mixture by preparing an institutional basis for the activation of recycled heated asphalt mixture. ), revised the national standard for the recycled heated asphalt mixture (GR F 4005) (2009.08), and the Ministry of Land, Transport and Maritime Affairs guidelines established the quality performance standard based on the research results on the development of the Korean pavement design method and the improvement of pavement performance. Revision completed by revising and re-establishing quality performance and quality standards suitable for the reality of domestic asphalt road pavement by revising the national standards for the production and construction of phosphorus heated asphalt mixture (November 2009) and the existing heated asphalt mixture for pavement (KS F 2349). (2010.10).

Road pavement using asphalt mixture in Korea shows an increasing trend every year at a high rate (Ministry of Land, Transport and Maritime Affairs, 2010). The ratio of road extension accounts for about 70%, and among them, the ratio of road extensions with more than 20 years of public use is about 20%, showing a continuous increase year by year (Korea Institute of Construction Technology, 2001). The maintenance cost of asphalt concrete pavement in Korea is increasing rapidly every year due to factors such as the quantitative increase in the pavement rate. It is caused by an increase in breakage. The aging of the existing asphalt concrete pavement is causing various types of pavement damage along with the increase of waste asphalt concrete generating materials. In the case of asphalt concrete pavement, plastic deformation (rut), pot hole (pot hole), shoving (shoving) and cracks occur at an early stage, so the life of the pavement is short enough to be less than 5 years. The cost and environmental problems for the disposal of waste asphalt concrete generated by the large-scale repair and re-pavement of these asphalt concrete pavements are emerging as serious issues.

Accordingly, the present applicant has applied for registration patent No. 10-1030308 “additive composition for asphalt mixture and modified asphalt mixture to which the composition is added”, and registered patent No. 10-1487855 “modified recycled asphalt mixture” and registered patent No. 10-2134403 “A medium-temperature modified asphalt mixture with reduced odor and a method for manufacturing the same” has been presented, and in the present invention, a medium-temperature reforming additive made of recycled aggregate such as waste glass and waste asphalt, waste plastic, and a modified sulfur by-product. This paper proposes a circulating medium-temperature reformed asphalt mixture that is recycled from waste resources.

Registered Patent No. 10-1030308 Registered Patent No. 10-1487855 Registered Patent No. 10-2134403

Accordingly, the present invention was devised to eliminate the above problems, and recycled aggregate obtained by crushing waste glass material and waste asphalt concrete is added with natural aggregate to prepare aggregate for asphalt mixture, and a polymer material made by crushing waste plastic A binder is prepared by mixing and manufacturing a pelletized medium temperature additive including paraffin wax, EB wax, stearic acid, oil, and slaked lime on asphalt in a dry or wet method, and the binder with medium temperature modifying properties is used. It was completed as a technical task with a focus on the recycled medium-temperature reformed asphalt mixture, which is a recycled medium-temperature reformed asphalt mixture that is recycled and used by mixing it in a dry or wet manner.

The present invention for achieving the above technical problem, in composing the circulating medium-temperature reformed asphalt mixture recycled waste resources, as natural aggregate, 30-50 parts by weight of coarse aggregate crushed to 10-40 mm, and 1-10 mm 20 to 60 parts by weight of fine aggregate crushed into a; As recycled recycled aggregate, 10-50 parts by weight of waste asphalt crushed to 1-13 mm, and 10-40 parts by weight of waste glass material crushed to 1-5 mm; As the waste glass material, a transparent material is used, and 2 to 10 parts by weight of a filler material for asphalt pavement is prepared, including 2.3 to 4.0 parts by weight of new asphalt, and 2.0 to 2.0 to old asphalt of recycled aggregate for asphalt. To 3.0 parts by weight, 2.3 to 3.0 parts by weight of a medium temperature additive made of sulfur polymer generated in the petroleum refining process; prepare a modified medium temperature binder (A2) including; The modifier of the polymer material formed from the used plastic waste is 2.0 to 8.0 parts by weight based on the weight of the asphalt mixture; The waste plastic forms scratches on the surface to secure a wider specific surface area of the crushed waste plastic in order to increase the adhesive force with the binder including asphalt, and the waste plastic material is a low-density polyethylene recycled material, the modified medium temperature It is composed by further mixing functional additives made of at least one of antioxidants, antioxidants, zeolite, and process oil in binder (A2), and waste tire fine powder (CRM) with modified aging properties, and the waste tire fine powder ( CRM) is formed from fine powder of raw rubber of 1 mm or less regenerated from waste tires for vehicles, and the modified medium temperature binder (A2) is mixed with the used aggregate (A1). A mixture is provided.

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According to the present invention as described above, recycled aggregate obtained by crushing waste glass material and waste asphalt concrete is added with natural aggregate to prepare aggregate used for asphalt mixture, and a polymer material modifier obtained by crushing waste plastic, paraffin wax, EB A binder is prepared by mixing and manufacturing a pelletized medium temperature additive including wax, stearic acid, oil, and slaked lime on asphalt in a dry or wet method, and the binder having medium temperature modifying properties is mixed with the aggregate in a dry or wet method. There are effects such as being able to do it.

Hereinafter, specific details for carrying out the present invention will be described in more detail with reference to the accompanying drawings.

The present invention prepares an aggregate used for asphalt mixture by inputting recycled aggregate obtained by crushing waste glass material and waste asphalt concrete with natural aggregate, a polymer material modifying additive obtained by crushing waste plastic, paraffin wax, EB wax, and stearic acid , Pelletized medium temperature additives including oil and slaked lime are mixed and manufactured on asphalt in a dry or wet method to prepare a binder, and the binder having medium temperature modifying properties is mixed with the aggregate to be used in a dry or wet method. It relates to a recycled medium-temperature reformed asphalt mixture that is recycled from resources, including coarse aggregate and fine aggregate as natural aggregate, waste glass material as recycled recycled aggregate, waste asphalt concrete, asphalt pavement filler material, new asphalt material, old asphalt material, and waste plastic material Modified additives and medium temperature additives including paraffin wax and Eb wax.

The recycled medium-temperature reformed asphalt mixture recycled waste resources of the present invention contains natural aggregate, recycled recycled aggregate, asphalt, modified additive and medium-temperature additive, and as shown in [Table 1] below, the recycled heated asphalt mixture (comparison Marshall stability (MS), flow value (Flow), porosity (VTM), saturation (VFA), void ratio (VMV), dynamic stability (DS), indirect tensile strength compared to Example 1) and heated asphalt mixture (Comparative Example 2) (ITS), toughness, tensile strength ratio (TSR), water immersion marshal residual stability (MSR), commonality PG grade (binder) quality characteristics are high, While the resistance is strong, it is possible to realize reduction of production cost and reduction of product production energy and carbon dioxide by reducing the production temperature of about 20 to 40°C.

In particular, purchase of natural aggregates by using 10-40 parts by weight of waste glass material crushed to 1-5 mm and waste asphalt crushed to 1-13 mm by replacing some of the fine aggregates crushed to 1-10 mm among natural aggregates In addition to reducing the high cost burden caused by construction waste, it will be possible to fulfill the recycling obligation for construction wastes such as soil, concrete and asphalt concrete that are discharged in excess of a certain scale according to the 「Act on Promotion of Recycling of Construction Wastes」. And, by using a polymer material formed of waste plastic material crushed to 0.1 to 1 mm (1 mm or less) as a modifying additive, it was implemented so that waste resources including waste glass materials, waste asphalt concrete and waste plastics could be recycled. In this case, it is preferable to use the waste plastic by forming scratches on the surface so as to secure a wider specific surface area of the crushed waste plastic in order to increase the adhesive force with the binder including asphalt.

The specific composition of the circulating medium-temperature reformed asphalt mixture in which the waste resources are recycled is as follows.

The present invention comprises natural aggregate, recycled recycled aggregate, asphalt pavement filler, new asphalt, old asphalt of recycled aggregate for asphalt, a modifying additive made of waste plastic, and a medium temperature additive including paraffin wax and Eb wax.

First, as for the natural aggregate, the particle size or quality of the aggregate used in asphalt concrete complies with KS F 2357 standard that stipulates coarse aggregate and fine aggregate for use in bitumen pavement, and KS F 2357 standard is 'Aggregate for asphalt mixtures' As a Korean industrial standard for ', it stipulates the quality of aggregates and the grain size of coarse and fine aggregates.

At this time, the coarse aggregate is crushed aggregate (crushed stone), crushed slag, crushed gravel, etc., and preferably does not contain harmful substances such as clay, silt, and organic matter (refer to KS F 2357 standard), and in the present invention In particular, it is recommended to use those crushed to 10 to 40 mm, and to include 30 to 50 parts by weight.

In addition, the fine aggregate is crushed sand (screenings) obtained by breaking rocks, gravel, etc., natural sand, or a mixture thereof, and preferably does not contain harmful substances such as dust, clay, organic matter, etc. (refer to KS F 2357 standard) , In particular, it is recommended to use crushed pieces of 1 to 10 mm, and to include 20 to 60 parts by weight.

In addition, the natural aggregate includes recycled recycled aggregate in order to implement the circulating medium temperature reformed asphalt mixture in which the waste resources of the present invention are recycled.

The recycled recycled aggregate is provided to supplement the fine aggregate among natural aggregates, and it is possible to achieve cost reduction while having similar physical properties to the fine aggregate. This recycled recycled aggregate includes 10 to 50 parts by weight of waste asphalt crushed to 1 to 13 mm (waste asphalt mixture). At this time, the waste asphalt is mainly discarded after use of the general heated asphalt mixture, which has similar physical properties to fine aggregate and is used to secure better physical properties because it contains asphalt.

The binder content of the recycled aggregate (RAP) for recycled asphalt concrete is as shown in [Table 1] below.

[Table 1]

In addition, the basic physical properties of each size of waste asphalt cones are shown in [Table 2] below.

[Table 2]

In addition to this, in addition to the waste asphalt cone, 10-40 parts by weight of the waste glass material crushed to 1-5 mm is further included. In this case, the waste glass material was made of a transparent material, and after removing foreign substances from the surface, it is crushed and used.

The performance of the fine aggregate applied asphalt mixture of the waste glass (bottle) material and the strength characteristics of the 50% fine aggregate applied asphalt mixture are shown in [Table 3] below.

[Table 3]

In addition, 2 to 10 parts by weight of a filler for asphalt pavement made of limestone powder is included in the circulating medium-temperature reformed asphalt mixture in which the waste resources are recycled. At this time, the filler for the pavement may use a filler for asphalt pavement known in the art, and as an example of the component, at least one powder of Portland cement, fly ash, dust, steelmaking dust, and other suitable mineral materials may be mixed and used. , characteristics such as the particle size of these fillers are described in, for example, KS F 3501 standard.

The above-mentioned natural aggregate, recycled recycled aggregate and asphalt pavement filler are prepared for use aggregate (A1). As follows.

[Table 4] Physical properties of coarse aggregate, fine aggregate, and filler for asphalt pavement

[Table 5] Grain size characteristics of coarse aggregate, fine aggregate and asphalt pavement filler

On the other hand, a modified medium temperature binder (A2) for mixed use with the used aggregate (A1) is required to compose the circulating medium temperature modified asphalt mixture in which the waste resources of the present invention are recycled, and for this, the asphalt is first prepared.

The asphalt typically exists in a solid or semi-solid state at room temperature, but has a property of being melted and liquefied when heated. In the case of petroleum-based asphalt, various types of straight-run asphalt in the oil refining process may be used as it is, or diluted asphalt obtained by diluting the DC asphalt with paraffin distillate, aromatic, naphthenic fraction, or mixtures thereof may be used. can Asphalt is widely classified into several grades based on hardness, and in this regard there are penetration, viscosity, and compatibility grades.

In particular, the asphalt compatibility grade can be said to be the beginning of the asphalt compatibility grade (PG) composed of the binder test method of the SuperPave (Superior Performance Asphaet Pavement) system developed through the Strategic Highway Research Program (SHRP) of the United States. The quality of the asphalt pavement applied to the site has been improved since the establishment of the utility grade (PG grade) in the United States, and it is very encouragingly evaluated. The standard for asphalt compatibility grade is to select an appropriate asphalt suitable for regional characteristics in consideration of the climate and traffic conditions of the site so that it can resist the pavement damage caused by plastic deformation and low-temperature cracking. The latest guidelines for asphalt mixture production and construction (2020 ), it is difficult to properly reflect the high-temperature resistance characteristics of asphalt according to the penetration grade, so the section with a high risk of plastic deformation has a certain grade or higher (PG58-22 or KS according to the KS standard) It is recommended to use asphalt of PG64-22).

Among these asphalts, in the present invention, 2.3 to 4.0 parts by weight of new asphalt produced at an oil refinery, that is, new asphalt (AP-5) is included, and to implement a circulating medium-temperature reformed asphalt mixture in which waste resources of the present invention are recycled. It is configured to further contain 2.0 to 3.0 parts by weight of the old asphalt of the recycled aggregate for asphalt.

The old asphalt of the new asphalt and the recycled aggregate for asphalt concrete is a material constituting the modified medium temperature binder (A2) for the implementation of the present invention, and the modified medium temperature binder (A2) includes a modifying additive first.

In the present invention for the implementation of the modifier, the modifier of the polymer material formed of the waste plastic material further comprises 2.0 to 8.0 parts by weight based on the weight of the asphalt mixture. In this case, as the waste plastic material, crushed 0.1 to 1 mm having a low melting point of 80 to 100° C. is used, which is used as a substitute for low-density polyethylene (LDPE).

The waste plastic material is a low-density polyethylene regenerated material and has excellent thermal adhesion and cold resistance, hardly changes in viscosity in a molten state, and exhibits chemical stability and high tensile force. In addition, with a melting point in the range of 80 to 100°C, workability is secured at a low temperature and compaction performance is improved.

The vertical shape of the waste plastic is shown in [Figure 1] below.

[Figure 1]

In addition, the basic physical properties of the waste plastic and the optimum ratio of the adhesive resin are shown in [Table 6] and [Table 7] below.

[Table 6]

[Table 7]

As a result of analyzing the reforming effect as a binder of the circulating medium-temperature reformed asphalt mixture obtained by recycling the waste resources of the present invention prepared as described above, the test results of the asphalt compatibility grade (PG) are shown in [Table 8] and [Table 9] below.

[Table 8]

[Table 9] PG Rating

And, the medium temperature additive for constituting the circulating medium temperature modified asphalt mixture in which the waste resources of the present invention are recycled includes paraffin wax and Eb wax.

Paraffin Wax is a low molecular weight substance with a molecular weight of several hundred that is in a solid state at room temperature and turns into a liquid when the temperature is raised. Or it is mixed with other resins, and it is produced from petroleum products and has a melting point of 60°C, and linear saturated carbon water having 20 to 36 carbons (C) is the main component and is used for candle manufacturing.

And Eb wax is a high melting point synthetic wax that functions as an internal and external lubricant for most thermosetting and thermoplastic plastics, a release agent, a pigment dispersant, etc., and is used to improve the quality of final products. And the melting point is 143 ~ 146 ℃ and is used as a lubricant for rubbers, additives, anti-blocking agents, anti-sticking agents, and the like.

The medium temperature additive includes paraffin wax and Eb wax having a low melting point of 60° C. or less. For ease of use, the medium temperature additive is sequentially melted, mixed, extruded, cooled, and pulverized as shown in [Figure 2] below. It is configured to be manufactured into pellets by carrying out so that it can be conveniently supplemented when necessary.

[Figure 2] Pelletization of medium temperature additives to improve usability of medium temperature modified asphalt binder

As another example of the medium-temperature additive, the pelletized medium-temperature additive including paraffin wax and Eb wax contains 2.0 to 4.0 parts by weight based on the weight of the asphalt binder used, wherein the sulfur polymer generated in the petroleum refining process is based on the weight of the asphalt mixture. 1.5 to 2.1 parts by weight can be optionally further included for the purpose of improving performance, and as another example of a medium temperature additive, a medium temperature additive made of sulfur polymer generated in the petroleum refining process instead of pellets containing paraffin wax and Eb wax is It can be prepared by including 2.0 to 3.0 parts by weight based on the weight of the asphalt binder used.

In addition, the modified medium temperature binder (A2) may be further mixed with a functional additive made of any one or more of antioxidants, antioxidants, zeolite, and process oil, and waste tire fine powder (CRM) with modified aging properties. .

The waste tire fine powder (CRM) is a fine rubber powder of 1 mm or less regenerated from waste tires for vehicles. It maintains high viscosity at high temperature to improve resistance to plastic deformation caused by vehicle load, and maintains low rigidity at low temperature. It has the effect of inhibiting the occurrence of temperature cracks.

The mixing ratio of the medium temperature modified asphalt mixture using the medium temperature modifier is shown in [Table 10] below.

[Table 10] (Example) Surface product (WC-2)

And, the quality performance of the medium temperature modified asphalt mixture using the medium temperature modifying additive is shown in [Table 11] below.

[Table 11] (Example) Surface product (WC-2)

The method for producing a circulating medium-temperature reformed asphalt mixture by recycling waste resources of the present invention as described above, in configuring the method for producing a circulating medium-temperature reforming asphalt mixture by recycling waste resources, is coarsely crushed to 10-40 mm as a natural aggregate. 30-50 parts by weight of aggregate, 20-60 parts by weight of fine aggregate crushed to 1-10 mm, 10-50 parts by weight of waste asphalt crushed to 1-13 mm as recycled recycled aggregate, and 1-5 mm crushed 10 to 40 parts by weight of the waste glass material and 2 to 10 parts by weight of a filler for asphalt pavement to prepare the aggregate (A1) used (S1); A polymer material modifier formed from 2.3 to 4.0 parts by weight of new asphalt, 2.0 to 3.0 parts by weight of old asphalt of recycled aggregate for asphalt, and 0.1 to 1 mm crushed waste plastic material having a low melting point of 80 to 100°C is asphalt. 2.0 to 8.0 parts by weight based on the weight of the mixture, and 2.0 to 4.0 parts by weight of the pelletized medium-temperature additive including paraffin wax and Eb wax having a low melting point of 60° C. or less based on the weight of the asphalt binder used; including a stirrer adding to the reactor (S2); preparing a modified medium temperature binder (A2) by maintaining the reactor at a predetermined temperature to melt the input materials while mixing and dispersing with the stirrer (S3); The operating time of the reactor and the stirrer is 27 to 40 hours, the temperature of the reactor is 120 to 140° C., the rotation speed of the stirrer is 1300 to 1700 rpm, and the reforming medium temperature binder (A2) prepared in the steps S2 to S3 is Preparing an asphalt mixture by heating the used aggregate (A1) prepared in the step S1 in the filled reactor and then putting it into the reactor (S4); After stirring the asphalt mixture prepared through step S4 for 20 to 25 minutes, cooling at room temperature of 15 to 25° C. for 5 to 5.5 hours (S4);

An example of the circulating medium temperature reformed asphalt concrete of the present invention prepared as described above is shown in [Figure 3] below.

[Figure 3] (Example) Surface product (WC-2)

And, for the field test demonstration of the circulating medium-temperature reformed asphalt mixture from recycled waste resources according to the present invention, the compaction evaluation of the substructure of the pavement layer is shown in [Figure 4] and [Table 12].

[Figure 4]

[Table 12]

According to the circulating medium-temperature reforming asphalt mixture in which the waste resources of the present invention are recycled as described above, recycled aggregate obtained by crushing the waste glass material and the waste asphalt concrete is added with the natural aggregate to prepare the used aggregate for the asphalt mixture, and the waste plastic is crushed A binder is prepared by mixing and manufacturing a polymer material modifier, which has been made into a polymer material, and a pelletized medium-temperature additive, including paraffin wax, EB wax, stearic acid, oil, and slaked lime, on asphalt in a dry or wet manner, and has the medium-temperature modifying property. It is possible to use the binder by mixing it with the aggregate in a dry or wet manner.

Although the present invention described above has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. should be made clear. Accordingly, the true technical protection scope of the present invention should be construed by the appended claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (5)

delete delete In composing the circulating medium-temperature reformed asphalt mixture that recycled waste resources,
As natural aggregate, 30-50 parts by weight of coarse aggregate crushed to 10-40 mm and 20-60 parts by weight of fine aggregate crushed to 1-10 mm;
As recycled recycled aggregate, 10 to 50 parts by weight of waste asphalt crushed to 1 to 13 mm, and 10 to 40 parts by weight to waste glass material crushed to 1 to 5 mm; As the waste glass material, a transparent material is used,
Prepare the aggregate (A1) to be used including; 2 to 10 parts by weight of the filler material for asphalt pavement,
Modified medium temperature binder (A2) including 2.3 to 4.0 parts by weight of new asphalt and 2.0 to 3.0 parts by weight of old asphalt of recycled aggregate for asphalt, 2.3 to 3.0 parts by weight of sulfur polymer generated during petroleum refining prepare,
The modifier of the polymer material formed of 0.1 to 1 mm crushed waste plastic material having a low melting point of 80 to 100° C. is 2.0 to 8.0 parts by weight based on the weight of the asphalt mixture; The waste plastic forms scratches on the surface to secure a wider specific surface area of the crushed waste plastic in order to increase the adhesive force with the binder including asphalt, and the waste plastic material is a low-density polyethylene recycled material,
The modified medium temperature binder (A2) is further mixed with a functional additive made of any one or more of antioxidants, antioxidants, zeolite, and process oil, and waste tire fine powder (CRM) with modified aging properties, and the waste tire Fine powder (CRM) is formed from fine powder of raw rubber of 1 mm or less regenerated from waste tires for vehicles,
Circulating medium temperature reforming asphalt mixture from recycled waste resources, characterized in that the modified medium temperature binder (A2) is mixed and used in the aggregate (A1).
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