KR102257189B1 - Glass fiber asphalt reinforcement material for asphalt mixtures and asphalt mixtures comprising the same - Google Patents

Abstract

The present invention relates to an asphalt mixture reinforcement which prevents plastic deformation, cracks, and damage such as potholes of asphalt pavement and is manufactured by impregnating glass fiber powder or industrial by-product powder and bundle-type reinforcing fibers simultaneously with recycled or new plastic resin to mold into a rod shape, which makes it possible to manufacture at low cost, and easy to insert a single reinforcing material, and reduces construction costs, and to an asphalt mixture containing the same. The asphalt mixture reinforcement according to an embodiment of the present invention is an asphalt reinforcing material which is mixed with aggregate and an asphalt binder to constitute an asphalt mixture with a length of 5 to 30 mm, and which is made by impregnating a bundle of reinforcing fibers consisting of 2,000 to 3,000 individual strands of reinforcing fibers with a thermoplastic resin mixed with glass fiber powder or industrial by-product powder to form an inner and outer shell of the reinforcing fiber bundle.

Description

Manufacturing method of rod-shaped asphalt reinforcement material {GLASS FIBER ASPHALT REINFORCEMENT MATERIAL FOR ASPHALT MIXTURES AND ASPHALT MIXTURES COMPRISING THE SAME}

The present invention relates to an asphalt reinforcing material for an asphalt mixture and an asphalt mixture comprising the same, and specifically, a rod-shaped asphalt formed by simultaneously impregnating recycled or new plastic resin with glass fiber powder or industrial by-product powder and bundle-shaped reinforcing fibers. It relates to a mixture reinforcement and an asphalt mixture comprising the same.

As for road pavement, cement concrete pavement or asphalt pavement (ascon) is mainly implemented.

Cement concrete pavement refers to a pavement in which a cement concrete plate is placed on a roadbed made of granular material such as crushed stone, and it is widely used because it has good adaptability to heavy vehicles and has a long service life. However, cement concrete pavement has a long curing time, and processes such as joint installation are very complicated. In addition, periodic maintenance of the joints is required, maintenance time is long and costs are high, and there are problems such as poor ride comfort due to noise and joints. Usage is decreasing.

Asphalt pavement refers to road pavement that covers the surface with an asphalt mixture. Compared to cement concrete pavement, the adaptability to heavy vehicles is relatively low, and plastic deformation, cracks, and potholes occur frequently. In addition, there is a problem that the common life is short and frequent maintenance is required. However, asphalt pavement is used in many places, such as urban roads, due to the rapidity and simplicity of construction and low maintenance costs. Asphalt pavement accounts for more than 90% of the road pavement.

In order to improve the life of the asphalt pavement and prevent cracks and plastic deformation of the asphalt pavement, various methods have been used. One of them is a method of using a high-viscosity asphalt binder modified with a polymer, or mixing reinforcing fibers in which two or more fibers selected from carbon fibers, glass fibers, aramid fibers, and polyester fibers are mixed in an asphalt mixture. However, the reinforcing fibers obtained by mixing two or more different types of fibers cause a phenomenon in which the fibers are balled when producing an asphalt mixture, which is a problem in use.

Various methods have been proposed to solve this problem. Korean Patent Registration No. 10-1494799 is a pellet-shaped crushed reinforcement material coated with an outer shell material of an asphalt binder on a glass fiber crushed powder, and a fiber reinforcement material having a rod shape coated with a polypropylene resin material coated on a glass fiber bundle. A technique for mixing into a mixture is disclosed.

In addition, Korean Patent No. 10-1659727 is a pellet for modified asphalt by uniformly mixing one type of inorganic continuous fiber and two types of inorganic pulverized fibers with a thermoplastic resin, and extruding them into two types of pellets in the form of rods and aggregates. Disclosed is a technology for manufacturing.

However, the reinforcing materials of the above registered patents are used by mixing two or more types of reinforcing materials individually, and in this case, each reinforcing material must be individually injected and produced, and the amount of each reinforcing material is individually measured and used, or Since a process requires the use of a separate external input machine, the manufacturing process is complicated and there is a problem in that the cost is increased.

Another method is to laminate geotextiles woven in a grid form in the middle. For this example, Korean Patent No. 10-1427375 proposes a breathable polyethylene film for asphalt pavement and an asphalt reinforcing material including the same, but it requires a process of installing a separate grid-type reinforcing material during on-site construction, and the problem is expensive. have.

Korean Patent Registration No. 10-1494799 Korean Patent Registration No. 10-1659727 Korean Patent Registration No. 10-1427375

The present invention is to solve the above problems, while preventing plastic deformation, cracks, and breakage of potholes of an asphalt pavement, glass fiber fragments or industrial by-products powder, and bundle-type reinforcing fibers are simultaneously recycled or reinforced with new plastic resins. It is an object of the present invention to provide an asphalt mixture reinforcement material that can be manufactured at low cost by impregnating and molded into a rod shape, easy to input a single reinforcing material, and reduce construction cost, and an asphalt mixture including the same.

The asphalt mixture reinforcement according to the present invention for achieving the above object is an asphalt reinforcement material that is mixed with an aggregate and an asphalt binder to constitute an asphalt mixture, has a length of 5 to 30 mm, and consists of 2,000 to 3,000 individual strands of reinforcing fibers. The resulting reinforcing fiber bundle is impregnated with a thermoplastic plastic resin in which glass fiber powder or industrial by-product powder is mixed to form an inner and outer shell of the reinforcing fiber bundle.

The thermoplastic plastic resin is a mixture of low-density polyethylene and low-viscosity polypropylene, and may be included in an amount of 40 to 45% by weight based on the total weight of the asphalt reinforcing material.

In addition, the glass fiber powder or industrial by-product powder may be included in an amount of 35 to 40% by weight based on the total weight of the asphalt reinforcing material.

The reinforcing fiber bundle may be included in an amount of 15 to 25% by weight based on the total weight of the asphalt reinforcing material.

The industrial by-product powder may be one or more of a calpet having a calcium carbonate content of 70% by _{weight or more, a fly ash having a silicon (SiO 2} ) content of 30% by weight or more, and a reject ash.

The glass fiber powder or industrial by-product powder may be mixed with a modified polymer resin and a curing agent so that the surface of the glass fiber fragment or industrial by-product powder is coated with a polymer resin.

The method of manufacturing an asphalt reinforcement according to the present invention,

A first step of preparing a composition for impregnation in which the glass fiber powder or industrial by-product powder is dispersed by mixing the thermoplastic plastic resin and the glass fiber powder or industrial by-product powder while heating to a predetermined temperature range;

A second step of impregnating the impregnating composition with reinforcing fiber bundles supplied from the outside to prepare a reinforcing material molded article in which the impregnating composition forms an inner and outer skin of the reinforcing fiber bundle; And,

A third step of cooling the reinforcing material molded product formed in the second step and cutting it into a predetermined length to manufacture a finished asphalt reinforcing material;

It may include.

In the first step, the plastic resin is 40 to 45% by weight based on the total weight of the total asphalt reinforcement, and the glass fiber powder or industrial by-product powder is 35 to 40% by weight based on the total weight of the asphalt reinforcement, and the reinforcement impregnated in the second step The fiber bundle may be included in an amount of 15 to 25% by weight based on the total weight of the asphalt reinforcement.

In addition, the glass fiber powder or industrial by-product powder used in the first step may be mixed with a modified polymer resin and a curing agent so that the surface of the glass fiber powder or industrial by-product powder is coated with a polymer resin.

The asphalt reinforcing material of the present invention is molded into a rod shape of a certain size by impregnating a bundle of reinforcing fibers in a resin composition prepared by mixing a thermoplastic plastic resin with glass fiber powder or industrial by-product powder at a certain ratio. And asphalt binder. As it melts in the asphalt mixture, reinforcing fiber and glass fiber powder or industrial by-product powder are uniformly dispersed to improve the adhesion strength on the aggregate surface and the strength of the asphalt mixture by increasing the toughness of the mixture by the reinforcing fiber. And durability can be significantly increased.

1 is a view schematically showing a photograph of an asphalt reinforcement according to the present invention and its configuration.
2 is a plan view schematically showing an embodiment of the configuration of a manufacturing apparatus for manufacturing an asphalt reinforcement of the present invention.
3 is a photograph showing a state in which the reinforcing fibers are dispersed after mixing the reinforcing material according to the present invention with an asphalt mixture.
4 is a marshall stability test result of the asphalt mixture of Comparative Examples and Examples.
5 is a dynamic stability test result of the asphalt mixture of Comparative Examples and Examples.
6 and 7 are graphs and photographs showing the results of a Hamburg wheel tracking test for the asphalt mixture of Comparative Examples and Examples.

All technical terms used in the present invention, unless otherwise defined, have the following definitions and correspond to the meaning as commonly understood by those of ordinary skill in the relevant fields of the present invention. In addition, although preferred methods or samples are described in the present specification, those similar or equivalent are included in the scope of the present invention.

The term “about” refers to 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, or 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, or relative to a reference amount, level, value, number, frequency, percentage, dimension, size, amount, weight or length. Means an amount, level, value, number, frequency, percentage, dimension, size, amount, weight or length varying by 4, 3, 2 or 1%

Throughout this specification, unless otherwise required by the context, the terms "comprise" and "comprising" include the steps or components presented, or groups of steps or components, but any other step or component, or It is to be understood that it implies that a step or group of components is not excluded.

The present invention relates to an asphalt reinforcement that is mixed with an aggregate and an asphalt binder to produce an asphalt mixture. 1 shows an asphalt reinforcement 10 according to the present invention, wherein the asphalt reinforcement 10 is a resin impregnated material 11 made of a thermoplastic plastic resin, a plurality of reinforcing fiber bundles 12 and glass fiber powder or industrial by-product powder (13) It can be made of an impregnated configuration.

The reinforcing fiber bundle 12 is made of a reinforcing fiber bundle composed of 2,000 to 3,000 individual fibers. The reinforcing fiber may be one selected from the group consisting of glass fiber, carbon fiber, basalt fiber, and polyester fiber. When the reinforcing fiber of the reinforcing fiber bundle 12 is glass fiber, it is a fiber with a diameter of 2,400 to 9,000 TEX, and an alkali content of less than 1% by weight, a specific gravity of 1.8 to 2.6, preferably 2.4 to 2.6, and tensile strength. Is 500 to 10,000 MPa, preferably 3,000 to 5,000 MPa, and the elongation at break is preferably 0.5 to 15%, preferably 3 to 6%.

After impregnating the reinforcing fiber bundle 12 with a composition in which a thermoplastic plastic resin and glass fiber powder or industrial by-products are mixed to form the inner and outer skin of the reinforcing fiber bundle 12, 5 to 30 mm, preferably 10 to 20 mm It is cut into a length and diameter of 2 to 3 mm to produce a rod-shaped asphalt reinforcement (10).

The plastic resin includes recycled or new low-density polyethylene and low-viscosity polypropylene, and the polyethylene has a melting point of 110 to 120°C, and the low-viscosity polypropylene is preferably in the range of 120 to 130°C. More preferably, a low-density polyethylene having a melting point of 120°C or less and a low-viscosity polypropylene having a melting point of 130°C or less may be used, and the viscosity of the mixed resin is maintained at 135°C or less at 1.0 Pa·s.

According to an embodiment of the present invention, the resin impregnated material 11 may have a viscosity of 2.0 Pa·s or less at 135° C. when the glass fiber powder or industrial by-product powder having a diameter of 75 μm or less is included. The industrial by-product powder may be at least one of a calpet having a calcium carbonate content of 70% by _{weight or more, a fly ash having a silicon (SiO 2} ) content of 30% by weight or more, and a reject ash. It is preferable to adopt a glass fiber crushed or industrial by-product powder having a particle size distribution residual ratio of at least 60% by weight or more for a 75 µm sieve passage and 40 wt% or less for a 45 µm sieve for the glass fiber crushed or industrial by-product powder. .

The asphalt reinforcing material 10 of the present invention preferably contains 40 to 45% by weight of plastic resin, 35 to 40% by weight of glass fiber powder or industrial by-product powder, and 15 to 25% by weight of reinforcing fiber bundles.

When the plastic resin content is less than 40% by weight, it is difficult to form the inner and outer shells of injection molding and reinforcing fiber bundles, and when the plastic resin content exceeds 45% by weight, the amount of glass fiber fragments or industrial by-products decreases. The effect of improving the physical properties of is lowered.

The asphalt reinforcement of the present invention can be produced by the following extrusion or injection molding method.

First, reclaimed or new plastic resin and glass fiber crushed or industrial by-product powder are mixed while heating at a temperature of 160 to 230°C, preferably 170 to 200°C, and the glass fiber crushed or industrial by-product powder is uniformly dispersed. Prepare the composition. At this time, the plastic resin is preferably 40 to 45% by weight based on the total weight of the asphalt reinforcing material, and the glass fiber powder or industrial by-product powder is preferably 35 to 40% by weight based on the total weight of the asphalt reinforcing material.

The resulting impregnation composition is impregnated with a bundle of reinforcing fibers supplied from the outside, extruded or injection-molded, cooled, and cut into a diameter of 1 to 10 mm and a length of 5 to 30 mm to prepare a final asphalt reinforcement (10). .

Figure 2 schematically shows an embodiment of the configuration of the manufacturing apparatus for manufacturing the asphalt reinforcement of the present invention, the reinforcing material manufacturing apparatus is supplied while the plastic resin and glass fiber powder or industrial by-product powder is transported respectively by a screw The body part 110 including the nozzle 111 that is connected to the body part 110 and the plastic resin and glass fiber powder or industrial by-product powder that are fastened to the body part 110 and passed through the nozzle 111 are supplied while being heated to a high temperature of 300°C or higher to be impregnated. A high-temperature impregnation part 120 in which a solvent composition is made, a fiber supply part 130 for supplying a separate bundle of reinforcing fibers to the high-temperature impregnation part 120, and a bundle of reinforcing fibers in the composition for impregnation in the high-temperature impregnation part 120 It includes a cooling and cutting unit 140 for cutting after cooling the extruded product to be impregnated.

Accordingly, the plastic resin and the composition of the glass fiber powder or industrial by-product powder are supplied to the high-temperature impregnation part 120 through the nozzle of the body portion 110 to melt the plastic resin to obtain the glass fiber powder or industrial by-product powder. Impregnating, and supplying the reinforcing fiber bundles 12 thereto, impregnating and discharging it, and cutting it into a predetermined shape and size in the cooling and cutting unit 140 to manufacture the rod-shaped asphalt reinforcing material 10. In this process, it is preferable to supply the plastic resin by heating at 160 to 230° C., more preferably at 170 to 200° C. in the body part 110 so that the impregnation layer is uniformly formed.

Meanwhile, when the glass fiber fragments or industrial by-product powder of the asphalt reinforcing material 10 are uniformly impregnated in the plastic resin and mixed with the aggregate and the asphalt binder to form an asphalt mixture, it is possible to increase the bonding strength with other asphalt binders and other aggregates. For this purpose, the glass fiber powder or industrial by-product powder may be mixed with a modified polymer resin and a curing agent to coat the surface of the glass fiber powder or industrial by-product powder with a polymer resin. Here, the modified polymer resin is preferably a modified epoxy resin in which rubber modification for imparting ductility and a silane component for inducing hydrogen bonding at the interface of inorganic and organic materials are entrained.

The asphalt reinforcement 10 manufactured as described above is mixed in a plant mixer together with an aggregate and an asphalt binder to form an asphalt mixture. The asphalt reinforcement 10 may be included in an amount of 0.1 to 10% by weight based on the total weight of the asphalt mixture.

The aggregate may be sand, crushed stone, gravel, or the like, and is not particularly limited. The content of aggregate in the asphalt mixture may be 50 to 98% by weight, preferably 80 to 95% by weight, based on the total weight of the mixture. Although the thickness of the aggregate is not particularly limited, it is preferable to have an aggregate particle size distribution having a maximum size of a coarse aggregate of 10 to 40 mm and a penetration rate of 2.5 mm (No. 8) of 7 to 65% by weight.

The asphalt binder may be straight asphalt, blown asphalt, or the like, and is not particularly limited. The asphalt binder may be 1 to 30% by weight, preferably 3 to 20% by weight, based on the total weight of the asphalt mixture.

In the process of manufacturing the asphalt mixture, the asphalt reinforcing material, the aggregate, and the asphalt binder are mixed at the weight ratio, and in this process, the mixture is preferably heated to a temperature of 120 to 170°C. Since the plastic resin (polyethylene resin) of the asphalt reinforcing material 10 of the present invention has a low melting point, the coating layer of the asphalt reinforcing material 10 is melted during the mixing process, and the reinforcing fiber and glass fiber of the asphalt reinforcing material 10 are broken or industrial by-products. The powder will be dispersed in the asphalt mixture. Since the polyethylene resin melts even at a low temperature, the cost of producing an asphalt mixture is lower than that of using a thermoplastic resin having a high melting point such as polypropylene, and thus economical efficiency is excellent.

Hereinafter, the present invention will be described in detail by way of examples.

Example

The durability of the asphalt mixture containing the asphalt reinforcement prepared in the present invention was evaluated. Prepare a specimen of an asphalt mixture containing the asphalt reinforcement material, fine aggregate, coarse aggregate, stone powder filler, and asphalt binder of the present invention in the contents of Table 1 below, and marshall stability, dynamic stability, and Hamburg wheel tracking test for durability evaluation, etc. Was carried out.

division aggregate
content
(wt%) Stone powder filler
content
(wt%) Asphalt binder
content
(wt%) Reinforcement content
(wt%) Comparative example 94.0 1.0 5.0 0 Example 94.0 1.0 1.5

The comparative example is a generally used asphalt mixture, and in the case of the example, the asphalt reinforcing material 10 of the present invention was added in an amount of 1.5% by weight to the mixture having the same conditions as the comparative example.

As shown in FIG. 3, it can be seen that the reinforcing fibers (glass fibers) of the asphalt reinforcing material 10 are well dispersed after the usual mixing process after the addition of the asphalt reinforcing material.

As a result of the relative comparative test of FIG. 4, it was confirmed that the durability value of the asphalt mixture of the Example including the reinforcement according to the average marshall stability was improved by about 1.5 times or more compared to the Comparative Example.

As a result of the dynamic stability test in the non-immersion room temperature condition of FIG. 5, the asphalt mixture of the present invention showed a result that the deformation depth was 2.7 times or more smaller than that of the comparative example, and the durability of the asphalt mixture of the present invention containing an asphalt reinforcement was very You can see a big one.

In addition, as a result of the Hamburg wheel tracking test for the mixture immersed in water at 50° C. in FIGS. 6 and 7, in the case of the Example, the deformation depth measured after applying 20,000 loads was 1 mm or less, whereas in the case of the comparative example, 20,000 It can be seen that the durability of the embodiment containing the asphalt reinforcement of the present invention is very high, as it is completely destroyed before reaching the time.

As described above, specific parts of the present invention have been described in detail, and it is obvious that these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereto for those of ordinary skill in the art. Accordingly, it will be said that the substantial scope of the present invention is defined by the appended claims and their equivalents.

10: asphalt reinforcement material 11: resin impregnated material
12: reinforcing fiber bundle 13: glass fiber powder or industrial by-product powder
110: body part 111: nozzle
120: high temperature impregnation unit 130: fiber supply unit
140: cooling and cutting part

Claims (10)

It is made by impregnating a reinforcing fiber bundle 12 consisting of 2,000 to 3,000 reinforcing fiber strands in a thermoplastic plastic resin mixed with glass fiber powder or industrial by-product powder to form an inner and outer shell of the reinforcing fiber bundle, and an aggregate and an asphalt binder and As a method for producing an asphalt reinforcement material that is mixed together to constitute an asphalt mixture,
Glass fiber powder or industrial by-product powder coated with a resin in which a thermoplastic plastic resin, a modified polymer resin and a curing agent are mixed is mixed while heating in a temperature range of 160 to 230°C, and impregnated in which the glass fiber powder or industrial by-product powder is dispersed. A first step of preparing a composition for use;
A second step of impregnating the impregnating composition prepared in the first step with the reinforcing fiber bundles 12 supplied from the outside to prepare a reinforcing material molded article in which the impregnating composition forms the inner and outer skins of the reinforcing fiber bundles 12; And,
A third step of cooling the molded product of the reinforcing material molded in the second step and cutting it into a length of 10 to 20 mm and a diameter of 2 to 3 mm to produce a finished product of an asphalt reinforcing material in a rod shape;
Including,
The thermoplastic plastic resin used in the first step is a mixture of low-density polyethylene having a melting point of 120°C or less and low-viscosity polypropylene having a melting point of 130°C or less, and maintains a viscosity of 1.0 Pa·s or less at 135°C, and the asphalt reinforcement as a whole. It is included in 40 to 45% by weight of the weight,
The glass fiber powder or industrial by-product powder is 35 to 40% by weight based on the total weight of the asphalt reinforcement,
The glass fiber powder or industrial by-product powder has a particle size distribution residual ratio of not more than 60% by weight of a 75 µm sieve, and 40 wt% or less of a 45 µm sieve,
The industrial by-product powder is at least one of a calpet having a calcium carbonate content of 70% by _{weight or more, a fly ash having a silicon (SiO 2} ) content of 30% by weight or more, and a reject ash,
In the second step, the reinforcing fibers of the reinforcing fiber bundle 12 are glass fibers with a diameter of 2,400 to 9,000 TEX, and an alkali content of less than 1% by weight, a specific gravity of 2.4 to 2.6, and a tensile strength of 3,000 to 5,000 MPa. , The elongation at break is 3~6%,
The reinforcing fiber bundle 12 is 15 to 25% by weight based on the total weight of the asphalt reinforcing material,
The modified polymer resin coated on the surface of the glass fiber fragment or industrial by-product powder used in the first step is a modified epoxy resin entrained with a silane component for inducing hydrogen bonds at the interface of inorganic and organic materials and rubber modification to impart ductility. And
In the first to third steps, a nozzle 111 is supplied while the thermoplastic plastic resin and the glass fiber powder or industrial by-product powder coated with a resin mixed with a modified polymer resin and a curing agent are respectively transferred by a screw. The body part 110 including the body part 110, the high-temperature impregnation part 120 that is fastened to the body part 110 and passed through the nozzle 111 and heated while being supplied with the thermoplastic plastic resin and glass fiber powder or industrial by-product powder. ), the fiber supply unit 130 for supplying the reinforcing fiber bundle 12 to the high temperature impregnation unit 120, and the high temperature impregnation unit 120 impregnated with the reinforcing fiber bundle 12 in the composition for impregnation and then extruded. A method of manufacturing an asphalt reinforcement, characterized in that it is carried out by a manufacturing apparatus including a cooling and cutting unit 140 for cutting after cooling the extrudate.
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