KR101925512B1 - Complex Reinforcing Material with Glass Fiber, And Method for Pavement of Asphalt Road Using the Same - Google Patents

Abstract

The present invention relates to a multi-directional and planar reinforcing asphalt reinforcing material, and an asphalt paving method using the same, capable of reducing construction costs while preventing damage such as rutting, cracks, port holes, and the like frequently occurring in an asphalt paving body due to a repeated vehicle load of a road pavement, and being easily constructed. According to the present invention, the multi-directional and planar reinforcing asphalt reinforcing material comprises: a first reinforcing material having a rod shape having a length of 5-30 mm and a diameter of 1-5 mm by coating a bundle of glass fibers cut to have a diameter of 10-20 μm and a length of 5-30 mm with a synthetic resin having a melting point of 105 to 115°C; a second reinforcing material having a cylindrical shape having a diameter of 3-5 mm and a height of 3-6 mm by coating the industrial byproduct powder with a synthetic resin having a melting point of 105 to 115°C; and a non-isotropic grid reinforcing material including a reinforcing grid composed of a warp arranged in a driving direction of a vehicle and a weft arranged in a direction perpendicular to the warp, and a synthetic resin film attached to the reinforcing grid, wherein the number of warps of an area corresponding to a driving part of a vehicle wheel does not correspond to a driving part of the vehicle wheel.

Description

Technical Field [0001] The present invention relates to asphalt pavement methods using multi-directional and planar reinforced asphalt reinforcing materials,

The present invention relates to a reinforcing material mixed with an asphalt binder, and more particularly to a reinforcement material in which industrial byproducts such as rod-shaped reinforcements and fly ashes, in which a glass fiber bundle cut to a predetermined length is coated with a synthetic resin, The present invention relates to a multi-directional and planar reinforced asphalt reinforcing material which includes an anisotropic glass fiber grid reinforcing material and can be mixed with an aggregate and an asphalt binder to produce a heated asphalt mixture.

Generally, road pavement mainly carries cement concrete pavement or asphalt concrete pavement (ascon). Among them, cement concrete pavement is used because it has a long curing time and a complicated process such as installation of joints, and has a good adaptability to a medium vehicle and a long public life.

However, concrete pavements require periodic maintenance of joints, long maintenance times, and high maintenance costs. In addition, the concrete pavement is hardly applied to urban roads with high traffic volume due to problems such as poor ride quality due to noise and joints, and the usage rate is gradually decreasing even in the expressway where concrete pavement was preferred.

Compared to concrete pavement, asphalt pavement has relatively low adaptability to heavy vehicles, plastic deformation, cracks, and potholes are frequent, resulting in a relatively short life span and frequent maintenance, resulting in increased congestion cost , Construction speed and simplicity, and low maintenance, it is used in many places such as city roads.

Damage of the ascon road pavement can be divided into internal factors such as insufficient pavement thickness, material defects, poor mix design, and external factors such as overloading of vehicles, environmental load, and poor compaction such as construction. Damage to road pavement varies greatly depending on the form, such as wheel rutting, shoving, depression, alligator cracking, and pothole. Among these, rutting refers to a form in which the road is settled along the locus of the vehicle running on the road surface. The rutting is caused by a lack of toughness or durability of the asphalt mixture, wear of the package, overheating of the asphalt mixture, Lt; / RTI >

In order to solve these problems, it is necessary to use high viscosity asphalt binder modified with polymer for the purpose of cracking and plastic deformation prevention of asphalt pavement, A method in which a reinforcing fiber composed of a mixture of two or more kinds of carbon fiber, glass fiber, aramid fiber and polyester fiber is mixed with an asphalt mixture or a fiber grid woven in a two-dimensional plane direction is installed for planar reinforcement .

Since reinforcing fiber has both elasticity and ductility, it plays a role in extending the lifetime of asphalt when applied to asphalt construction.

However, conventional reinforcing fibers composed of two or more heterogeneous fibers are problematic in construction due to the bowling phenomenon of the bundles of fibers during the production of the asphalt mixture.

Also, Korean Patent No. 10-1427375 discloses a breathable polyethylene film for asphalt paving and an asphalt reinforcement containing the same, as a reinforcing material for increasing the strength and durability of the asphalt pavement.

However, the reinforcing material of the above-mentioned patent is a two-dimensional flat reinforcing material woven in the form of a grid in the form of a grid, and a fibrous grid woven uniformly in both directions without any difference in the density of the fibrous grid weaves in the portion where the vehicle wheel load is concentrated, There is a problem that damage or breakage may occur due to failure to provide sufficient bending strength in a portion where vehicle wheel load is concentrated.

In addition, the conventional two-dimensional planar isotropic fiber grid reinforcing material is impregnated with an asphalt emulsion, so it is very sticky, and when it is rolled into a rolled state during storage, inner and outer surfaces are attached to each other, which makes it difficult to use.

When a two-dimensional flat fiber grid reinforcement is installed on a conventional asphalt substrate or asphalt is installed in a place where a reinforcement is installed, it is adhered to a wheel of a dump truck, finisher, Is greatly reduced.

Korean Registered Patent No. 10-1427375 (Registered on July 31, 2014) Korean Registered Patent No. 10-1494799 (Registered on February 12, 2015) Korean Patent Laid-Open No. 10-2009-0022835 (published on Mar. 4, 2009) Japanese Laid-Open Patent Publication No. 5-140464 (published Jun. 6, 1993) Japanese Patent Laid-Open No. 2008-189729 (Published on August 21, 2008)

SUMMARY OF THE INVENTION It is an object of the present invention to prevent rutting, cracking, and damage to a porthole, which frequently occur in an asphalt pavement caused by repetitive vehicle loads of road paving, The present invention provides a multi-directional and planar reinforcing asphalt reinforcing material which can reduce the construction cost and is easy to construct, and an asphalt packaging method using the same.

In order to accomplish the above object, the present invention provides a multi-directional and planar reinforced asphalt reinforcing material, comprising a bundle of glass fibers cut into a diameter of 10 to 20 탆 and a length of 5 to 30 mm, To form a bar having a length of 5 to 30 mm and a diameter of 1 to 5 mm; A second reinforcing material having a cylindrical shape with a diameter of 3 to 5 mm and a height of 3 to 6 mm by coating a synthetic by-product powder having a melting point of 105 to 115 캜; And a synthetic resin film adhered to the reinforcement grid, the reinforcement mesh comprising a reinforcement mesh consisting of a warp arranged in the vehicle running direction and a weft arranged in a direction orthogonal to the warp, Is greater than the number of tilts in a region not corresponding to the running portion of the vehicle wheel; .

The asphalt paving method using the asphalt reinforcing material according to the present invention comprises the following steps.

(a) mixing an aggregate and an asphalt binder with a first reinforcing material and a second reinforcing material to prepare an asphalt mixture

(b) Covering an anisotropic grid stiffener on the pavement of the road

(c) installing the asphalt mixture prepared in the step (a) on an anisotropic grid reinforcement

(d) covering the asphalt mixture with the anisotropic grid reinforcement.

According to the present invention, as the low-density polyethylene resin as the coating material of the reinforcing material is melted during the production of the asphalt mixture, the glass fibers are uniformly dispersed in the asphalt mixture, thereby increasing the meshing stress between the aggregates, The toughness of the mixture is increased.

In addition, when an anisotropic grid reinforcement is constructed in which an inclined interval of a region corresponding to a running portion of a vehicle wheel is different from an inclination interval of an area not corresponding to a running portion, deformation and cracking due to repetitive load of the vehicle can be efficiently And it is possible to prevent deformation and cracks which can be transferred from the lower part.

Therefore, when the road pavement is constructed using the asphalt reinforcing material according to the present invention, problems such as plastic deformation, fatigue cracking and port hole breakage of the pavement are solved, thereby improving the structural durability performance, A favorable effect can be obtained in terms of economical efficiency due to the absence of stones.

1 is a view showing a first reinforcing member and a second reinforcing member of an asphalt reinforcing material according to the present invention.
2 is an exploded perspective view showing an anisotropic grid reinforcement of an asphalt reinforcing material according to the present invention.
FIG. 3 is a plan view showing a state in which a reinforcing grid among the anisotropic grid reinforcements shown in FIG. 2 is applied to a road.
4 is a plan view of a road for explaining an embodiment of a region corresponding to a running portion of a vehicle wheel of a road;
5 is a plan view of a road for explaining another embodiment of a region corresponding to a running portion of a vehicle wheel of a road;
FIG. 6 is a plan view and a sectional view showing a heated asphalt pavement (HMA) (comparative example) using a general asphalt mixture and an asphalt pavement (embodiment) constructed using the asphalt reinforcing material of the present invention.
7 is a graph showing the MMLS3 test results for the comparative example and the example shown in Fig.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

Hereinafter, the multi-directional and planar reinforcing asphalt reinforcing materials and the heated asphalt mixture using the multi-directional and planar reinforcing asphalt reinforcing materials will be described in detail with reference to the accompanying drawings.

1 and 2, the asphalt reinforcing material according to the present invention comprises a plurality of first reinforcing materials 10 having a length of 5 to 30 mm and a diameter of 1 to 5 mm and a plurality of first reinforcing materials 10 having a diameter of 3 to 5 mm A second reinforcing member 20 having a cylindrical shape with a height of 3 to 6 mm and an anisotropic grid reinforcing member 20 integrally attached with the synthetic resin film 32 in a state in which the reinforcing fibers are woven in the form of an anisotropic grid 30).

The first reinforcing material 10 is formed by extruding a bundle of glass fibers 11 having a diameter (thickness) of 10 to 20 μm and a length of 5 to 30 mm in a range of about 2,400 to 9,600 TEX and a low density polyethylene (LDPE) to have a rod shape having a length of 5 to 30 mm and a diameter of 1 to 5 mm.

The glass fibers used in the first reinforcing material 10 are fibers having an alkali content of less than 1%, a specific gravity of 2.4 to 2.6, a tensile strength of 3,000 to 5,000 MPa, and a elongation at break of 3 to 6%.

The first reinforcing material 10 has a structure in which glass fiber bundles cut to a length of 5 to 30 mm are coated with low density polyethylene (LDPE) having a melting point of 105 to 115 DEG C, so that a mixture of mesophilic asphalt around 130 DEG C and 170 The low density polyethylene is melted in the process of producing the high temperature asphalt mixture at a temperature higher than < RTI ID = 0.0 > 1 C < / RTI > to allow the glass fibers to be uniformly dispersed in the asphalt mixture.

The low density polyethylene as a coating material of the first reinforcing material 10 is preferably 30 to 40% by weight based on the total weight of the first reinforcing material 10. In order to adjust the amount of the glass fiber and the low-density polyethylene to the above-mentioned range, an asphalt mixture can be prepared by further adding a resin reinforcing material in the form of a pellet made of a low-density polyethylene resin.

The first stiffener 10 is manufactured using an extruder to increase the tensile strength and tensile strength of the heated asphalt mixture. The first reinforcing material 10 is formed by coating a single glass fiber bundle (Roving Fiber) having a diameter of 10 to 20 탆 at 2,400 to 9,600 TEX with molten low density polyethylene at a temperature of 120 to 130 캜, Mm. ≪ / RTI > The first stiffener 10 preferably has a circular rod shape, but may have various shapes such as an elliptical shape and a polygonal shape.

The second reinforcing material 20 is made of a synthetic resin such as low density polyethylene (LDPE) having a melting point of 105 to 115 캜 coated on the industrial by-product powder to have a cylindrical shape with a diameter of 3 to 5 mm and a height of 3 to 6 mm . The industrial byproduct powder constituting the second reinforcing material 20 may be one kind of fly ash having a silicon dioxide (SiO 2) component of 40 wt% or more, a specific gravity of 2.2 or more and a 45 μm sieve fraction of 40 wt% Two species can be used.

The fly ash powder has a spherical particle shape, has a high powder density and a density of about 1,950 kg / m 3. The fly ash having such characteristics is coated with a low-density polyethylene resin to produce a second reinforcing material 20 in the form of an aggregate having a predetermined size.

In the process of manufacturing the second reinforcing material 20 by coating the low density polyethylene with fly ash, 50 to 60% by weight of the fly ash powder and 40 to 50% by weight of the low density polyethylene compound are mixed in an injection or extrusion molding machine having two hoppers, Or an extrusion molding machine so as to have a length of 3 mm to 6 mm to produce an aggregate.

The low density polyethylene which is a coating material of the second reinforcing material 20 is preferably 40 to 50 wt% with respect to the total weight of the second reinforcing material 20. [ .

The low density polyethylene of the second stiffener 20 is also melted in the process of preparing a mesophase mixture of about 130 ° C and a high temperature asphalt mixture of 170 ° C or higher and the fly ash powder is uniformly mixed in the asphalt mixture while the low density polyethylene is melted. Therefore, fly ash powder can be uniformly dispersed and mixed over the entire asphalt mixture when the fly ash powder is coated with low density polyethylene, rather than when the fly ash powder alone is mixed into the asphalt mixture.

The fly ash powder of the second reinforcing material 20 increases the specific surface area to improve the adhesion strength between the asphalt binder and the aggregate, thereby improving the overall durability and strength. The fly ash powder has adhesion with an asphalt binder which is superior to a stone filler having a size of 75 mu m or less.

Also, Hydrated Lime, which is a powdery anti-peeling material used in a conventional asphalt mixture, has a very small particle size, so it is difficult to accurately weigh it due to generation of dust when the asphalt mixture is produced into an asphalt plant. The fly ash powder of the second reinforcing material 20 has a relatively larger specific gravity than that of the slaked lime and thus has an advantage that the asphalt mixture can be well dispersed when dispersed in the asphalt mixture.

Also, the fly ash powder of the second stiffener 20 can be economically advantageous in terms of cost by replacing at least 50% to 60% of the asphalt mixture with the conventional asphalt mixture. In general, when designing a heated asphalt mixture, it is prescribed to use 20 to 30 kg of stone powder per 1,000 kg of the mixture. If the second stiffener 20 including fly ash powder is used, It is economically advantageous to produce heated asphalt mixtures without the management of stones and the input process.

The first reinforcing material 10, which is a fiber reinforcing material, is arranged in multiple directions in the asphalt mixture to increase the long-term fatigue crack resistance and microcrack resistance of the asphalt mixture. The second reinforcing material 20 has a ratio As the surface area increases, the adhesion strength of the asphalt binder and the aggregate is increased, thereby preventing the asphalt mixture from being pinched or lifted due to the weakening of the adhesion performance.

The first reinforcing material 10 and the second reinforcing material 20 have low melting points of low density polyethylene as a coating material and have a low melting point of about 105 to 115 DEG C so that the first reinforcing material 10 and the second reinforcing material 20 need not be charged before the beam breaking, Production process of heated asphalt mixture As it is, the first reinforcing material (10) and the second reinforcing material (20) are put in the middle between the dry bean and the wet bean. In this case, it is preferable that the first reinforcing material 10 is mixed with 0.3 to 0.6 wt% of the total weight of the heated asphalt mixture and the second reinforcing material 20 is mixed with 0.7 to 1.2 wt% with respect to the total weight of the heated asphalt mixture Do. The first reinforcing material 10 and the second reinforcing material 20, which have a specific gravity similar to that of the crushed stone aggregate of the heated asphalt mixture, are characterized by being capable of uniformly dispersing the glass fiber and the fly ash powder in the heated asphalt mixture after the ordinary non- .

As described above, the first reinforcing member 10 and the second reinforcing member 20 serve to increase the durability of the asphalt mixture itself. The anisotropic grid stiffener 30 is installed on the interface of the road pavement layer to prevent deformation and cracks due to repetitive load of the vehicle and to prevent deformation and cracks that can be transferred from the bottom.

Figures 2 and 3 show the anisotropic grid stiffener 30 wherein the anisotropic grid stiffener 30 comprises an inclined yarn 31a disposed in the vehicle running direction and an inclined yarn 31b disposed in a direction orthogonal to the inclined yarn 31a A reinforcing grid 31 made up of weft yarns 31b; And a synthetic resin film (32) attached to the reinforcing grid (31), the number of slopes (31a) of the area corresponding to the running part of the vehicle wheel corresponds to the running part of the vehicle wheel Is woven more than the number of warp yarns (31a) in the non-woven area.

The warp 31a of the reinforcing grid 31 means reinforcing fiber arranged in the running direction of the vehicle and the weft 31b means reinforcing fiber extending in the direction perpendicular to the running direction of the vehicle, do. The reinforcing fiber constituting the warp yarn 31a and the weft yarn 31b of the reinforcing grid 31 may be one or more kinds of fibers selected from the group consisting of carbon fiber, glass fiber, aramid fiber, . Any fiber satisfying the object of the present invention may be used, and preferably it may be a glass fiber or a polyester fiber.

As described above, the reinforcing grid 31 of the anisotropic grid stiffener 30 is arranged in a region where the number of slopes 31a of the region corresponding to the running portion of the vehicle wheel along the running direction of the vehicle does not correspond to the running portion of the vehicle wheel The number of slopes (31a) of the slope (31a) is larger than that of the slope (31a). The area corresponding to the traveling part of the vehicle wheel is more likely to be loaded and damaged due to the repeated travel of the vehicle than the area not corresponding to the traveling part of the vehicle wheel. Accordingly, in the present invention, the number of slopes (31a) of the area corresponding to the running area of the vehicle wheel can be increased to prolong the service life of the entire road pavement. In addition, it is possible to save the materials used for other parts due to the intensive reinforcement for the specific parts, thus being effective in cost reduction.

In an embodiment of the present invention shown in Fig. 4, a region D corresponding to the running portion of the vehicle wheel along the running direction of the vehicle extends from one lane of the road up to 30% of the lane width and from the other lane of the road It may mean up to 30% of the lane width, but the left and right sides of the corresponding area of the lane need not be the same width. The width of the area corresponding to the running portion of the vehicle wheel can be determined in consideration of the width of a lane to be installed, a traffic situation, and the like.

5, in the other embodiment of the present invention, the area D corresponding to the running portion of the vehicle wheel extends from a point 5 to 10% away from one lane of the road to 30% of the lane width, It can mean up to 30% of the lane width from a point 5 to 10% away from the other lane of the road.

The distance between adjacent slopes 31a in the region D corresponding to the running portion of the vehicle wheel along the running direction of the vehicle may be 10 to 25 mm. If the distance between the slopes 31a in the area is less than 10 mm, the efficiency is inadequate compared to the cost. If the distance is more than 25 mm, the reinforcing effect is insufficient.

Further, the distance between adjacent inclined yarns 31a in the region not corresponding to the running portion of the vehicle wheel may be 26 mm to 50 mm.

The distance between the weft and the weft of the reinforcing grid may be 10 mm to 50 mm.

The synthetic resin film 32 of the anisotropic grid stiffener 30 is preferably a polyethylene film. The basis weight of the polyethylene film may be 6 to 150 g / m 2, and preferably the basis weight of the polyethylene film may be 9 to 50 g / m 2.

In one embodiment, the synthetic resin film 32 of the anisotropic grid stiffener 30 comprises 4 to 25 weight percent low density polyethylene, 20 to 60 weight percent linear low density polyethylene, and the balance high density polyethylene with respect to the total weight of the synthetic resin film Polyethylene composition.

In another embodiment, the synthetic resin film 32 of the anisotropic grid stiffener 30 comprises 4 to 20% by weight of low density polyethylene, 10 to 45% by weight of linear low density polyethylene, 1 to 25% by weight of high density polyethylene, And the remainder may be made of a polyethylene composition containing an inorganic substance.

Wherein the inorganic substance is at least one selected from the group consisting of calcium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, magnesium sulfate, talc, kaolin, zinc oxide, titanium dioxide, alumina, aluminum hydroxide, magnesium hydroxide, zeolite, diatomaceous earth and clay , And the average particle size of the inorganic material may be 11 to 40 탆.

When the low-density polyethylene, the linear low-density polyethylene, and the high-density polyethylene are included as the synthetic resin film 32 as described above, the mechanical strength is high and the construction is convenient because the melting temperature is low.

A method of constructing the asphalt pavement using the asphalt reinforcing material including the first reinforcing material 10, the second reinforcing material 20 and the anisotropic grid reinforcing material 30 will be described as follows.

First, the aggregate and the asphalt binder are mixed with the first reinforcing material 10 and the second reinforcing material 20 to prepare an asphalt mixture.

Then, in order to improve adhesion to the asphalt or concrete base of the road, tack coating is carried out and the anisotropic grid reinforcement 30 is covered.

Then, an asphalt mixture prepared by mixing the first reinforcing material 10 and the second reinforcing material 20 is placed thereon, then tack coating is performed on the asphalt mixture, and an anisotropic grid reinforcing material 30 is covered.

Example

FIG. 6 is a schematic view showing an asphalt mixture using the asphalt reinforcing material of the present invention on a heated asphalt pavement (HMA) (comparative example) using a general asphalt mixture and a conventional heated asphalt pavement (HMA) Sectional view showing an asphalt pavement (Example) made of a fiber reinforced layer made by laying a 3 cm thick layer.

Table 1 shows the composition of the asphalt mixture used in the heated asphalt pavement of the above Comparative Examples and Examples.

division Comparative Example Example HMA (5 cm) HMA (2 cm) Fiber reinforcing layer (3 cm) aggregate 91.7 wt% 91.7 wt% 91.1 wt% Filler (limestone) 2.8 wt% 2.8 wt% 1.8 wt% Asphalt binder (AP-5) 5.5 wt% 5.5 wt% 5.5 wt% reinforcement The first stiffener 0.0 wt% 0.0 wt% 0.6 wt% Second stiffener 0.0 wt% 0.0 wt% 1.0 wt% Sum 100.0 wt% 100.0 wt% 100.0 wt% Anisotropic grid stiffener radish U

The MMLS3 (Model Mobile Loading Simulator) test was performed on the asphalt pavements of the comparative examples and the examples. The MMLS3 test was conducted to evaluate the durability of the asphalt pavement in the room. A small tire load (ground area of 7 cm x 7 cm, vertical pressure of about 0.2 to 0.5 MPa) at a speed of about 5 to 10 km / And the strain is measured. In the MMLS3 test, the load was set to 2.45 kN, and the temperature of the specimen after immersion was fixed at 50 ° C (2.5 cm deep from the surface).

FIG. 7 shows the MMLS3 test results of Comparative Examples and Examples. As a result of the test, it was confirmed that the plastic deformation amount of the Examples was about 1/2 of the Comparative Examples. Therefore, the plastic deformation resistance of the asphalt pavement constructed using the asphalt reinforcing material according to the present invention is much better, and the common performance is also excellent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

10: first stiffener 11: glass fiber
20: second stiffener 30: anisotropic grid stiffener
31: reinforcement grid 31a: slope
31b: weft 32: synthetic resin film

Claims (13)

delete delete delete delete delete delete delete delete delete delete delete A bundle of glass fibers cut to a diameter of 10 to 20 占 퐉 and a length of 5 to 30 mm is coated with a synthetic resin having a melting point of 105 to 115 占 폚 to form a first reinforcing material having a length of 5 to 30 mm and a diameter of 1 to 5 mm ;
A second reinforcing material having a cylindrical shape with a diameter of 3 to 5 mm and a height of 3 to 6 mm by coating a synthetic by-product powder having a melting point of 105 to 115 캜; And
A reinforcement grid consisting of a warp arranged in a vehicle running direction and a weft arranged in a direction orthogonal to the warp, and a synthetic resin film adhered to the reinforcement grid, so as to cover the layer interface of the road, Is greater than the number of tilts in a region not corresponding to the running portion of the vehicle wheel;
A method of asphalt paving using a multi-directional and planar reinforced asphalt reinforcing material,
(a) mixing an aggregate and an asphalt binder with a first reinforcing material and a second reinforcing material to produce an asphalt mixture;
(b) covering an anisotropic grid stiffener on the pavement surface of the road;
(c) laying the asphalt mixture prepared in the step (a) on an anisotropic grid reinforcement;
(d) applying an anisotropic grid stiffener over the installed asphalt mixture;
The asphalt pavement method comprising: The method of claim 12, wherein the first reinforcing material is mixed in an amount of 0.3 to 0.6 wt% based on the total weight of the asphalt mixture, and the second reinforcing material is mixed in an amount of 0.7 to 1.2 wt% based on the total weight of the asphalt mixture. Packaging method.

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