KR101462082B1 - Carpet recycling fiber for fiber-reinforced asphalt/cement concrete, method thereof, and fiber-reinforced asphalt/cement concrete composite - Google Patents

Abstract

The present invention relates to a nylon, polyester, and polypropylene raw materials for fiber reinforced systems that are being seriously examined for the purpose of improving the strength and durability of asphalt concrete road pavement materials, cement concrete building materials and industrial materials, Recycled waste carpets, which have been recycled, are recycled and used as fibers for fiber reinforcement. By this, it is possible to increase economic efficiency along with the reduction of resource circulation and industrial pollution, and to secure longevity improvement function. The present invention relates to a novel waste carpet regenerating fiber application technology and a composition using the same.
To this end, a method for manufacturing waste fiber reinforced concrete fiber reinforced concrete according to the present invention comprises the steps of preparing a waste carpet, shredding the prepared waste carpet to a predetermined size using a shredder, The shredding waste carpet pieces are fiberized by using a Hammer Mill or a Comminuter.

Description

FIELD OF THE INVENTION The present invention relates to a recycled fiber reinforced asphalt / cement concrete fiber reinforced asphalt / cement concrete composition, and a fiber reinforced asphalt / cement concrete composition using the fiber reinforced asphalt / cement concrete recycled fiber reinforced asphalt / cement concrete fiber reinforced asphalt / cement concrete. COMPOSITE}

The present invention relates to a waste fiber recycled fiber for fiber reinforced asphalt / cement concrete, a method for producing the same, and a fiber reinforced concrete composition using the fiber reinforced asphalt / cement concrete. More specifically, the present invention relates to an asphalt concrete road pavement, a cement concrete construction material, (Nylon, polyester, polypropylene, etc.), which are raw materials for fiber reinforced systems, which have been seriously under consideration for the development of longevity improvement technology due to the improvement of fiber technology. The present invention relates to a novel waste carpet recycled fiber utilization technology capable of securing a longevity improvement function capable of enhancing economic efficiency together with reduction of resource circulation and industrial pollution by using recycled fibers as reinforcing fibers and a composition using the same.

Asphalt concrete (hereinafter referred to as Ascon) has an asphalt binder in an amount of about 90 to 95% by weight, an asphalt binder in an amount of 5 to 10% by weight, a modifier and a cellulose fiber fiber) is added and heated to mix. It is a material that requires load resistance (stability of plasticity change) and crack stability at low temperatures in a car. Because these astrocons have typical thermoplastic viscoelastic flow characteristics, today's roads with high load loads, near-intersections, high-curb roads, and pavement roads have large plasticity changes due to rising atmospheric temperatures There is a problem that the risk of traffic accidents is increased due to the flatness (rutting) and road damage of the road surface. Also, at low temperatures such as in winter, cracks due to the lack of ductility due to the high rigidity of the ascones tend to cause road breakage. In order to secure stability of the plasticity change and stability of low-temperature cracking of these asbestos, the interlocking property by optimizing the particle size of the aggregate is designed to be a primary solution, and the consistency of the asphalt binder itself is increased, The second generation ascon design method can be regarded as the direction of research until now to secure the plasticity change resistance and the low temperature crack resistance due to the rise of the glass transition temperature. However, the second-generation asbestos design technique has already reached the limit in the study of the optimal combination of meshes, and it has been attempted to improve the binder con- stitution by using a synthetic rubber such as styrene-butadiene-styrene copolymer , Hereinafter referred to as SBS), but the viscosity of the ascon is too high to obtain a cone system for securing the plasticity change and the low-temperature crack resistance, so that the packaging operation can not be performed. .

In order to secure the cone structure of the ascon for securing the resistance to plastic change, the viscosity of the ascon is suppressed as much as possible so that the packaging operation is facilitated, while the cone structure due to the increase in the internal stress of the binder, that is, the fibrous material is uniformly distributed in the binder So-called fiber-reinforced asphalt concrete (FRAC), which is interlocked with these fibrous materials to increase internal stress, is called the third-generation ascon design method. The new concept of ascon design technique is being reported little by little.

However, the fiber diameter of the fiber, that is, the nylon fiber, the polyester fiber, and the polypropylene fiber, which are core components of the FRAC introduced in the third generation Ascon design method, Fiber length, fiber addition amount, etc., to investigate the influence on the FRAC performance, and it was found that the binder itself by fiber-reinforcing while maintaining the optimum ascon viscosity to facilitate workability of the as- (FRAC), which is capable of securing excellent resistance to plastic deformation and low-temperature cracking due to the improvement of conic system due to the interlocking of the fibers, the life cycle cost, Although the utility is very good, it has an initial cost increase problem. A situation which is to.

On the other hand, cement concrete (hereinafter referred to as concrete) is a material which forms a cured body by hydration reaction at room temperature by adding water using aggregates as an inorganic binder. It is a well-known fact that the concrete has such a disadvantage that the shear stress in the X-axis vector direction (i.e., the tensile strength) is weak with respect to the load voltage, while the compressive strength against the load voltage is very good However, as time passes, due to deterioration of concrete, lack of neutralization and salt resistance, the expansion pressure of the oxide caused by the corrosion of the inner reinforcement eventually results in internal stress destruction In order to overcome the disadvantages of lack of structural strength and to cause shortening of concrete structure due to occurrence of micro cracks due to generation of shrinkage stress due to curing of concrete, recently, corrosion prevention compounding technique and noncorrosive fiber reinforced concrete Fiber-reinforced Concrete (hereinafter referred to as FRC) It is a trend.

In particular, it is also possible to use a steel fiber such as a steel fiber, a nylon fiber, a polyester fiber, a polyolefin fiber (e.g. PP fiber or PE fiber), an aramid fiber, Carbon fiber, and polyvinyl alcohol fiber. However, as mentioned above, there is a problem in that the cost of the expensive virgin fiber is increased. A countermeasure strategy is needed.

As one of the measures to suppress the rise in initial cost while maintaining such high cost virgin fiber efficiency, many studies have been carried out in order to reduce the cost of resource recycling and the cost of raw materials through the recycling technology of waste plastics

For example, PET bottles are selectively separated from household waste plastics, these PET bottles are pulverized to a predetermined size, extruded into filaments having a diameter of about 0.5 to 2 mm through an extruder, and cut to a predetermined length to obtain polyester fibers There are many papers using FRAC and FRC.

However, since PET has a specific gravity of about 1.38 and a high specific gravity, the volume fraction% of FRAC and FRC becomes low as the fiber of the above-mentioned size, so that interlocking ) Power is not sufficient to obtain a desired performance, and when the PET bottle itself is converted to another use, higher value can be created, so that there is a limit to commercial expansion.

Meanwhile, attempts have been made to utilize the waste carpet as a synthetic fiber source. These waste carpets are dominated by nylon carpets and polyester carpets, which are about 2 to 3 million tons per year in the US and about 10 million tons in the domestic industry. In the case of nylon carpets, nylon fiber is used as a face fiber, a tufted polypropylene yarn is used as a backing material, and a styrene-butadiene latex ) Made of Nylon BCF (Bulk Continuous Filament) carpets and nylon surface layer made of SBR binder reinforced with calcium carbonate in the form of polyethylene or ethylene vinyl acetate (EVA) , And is classified as a polyester carpet in which 100 polyester fibers are felt-punched by needle punching.

Since these waste carpets are composed of three or more different types of synthetic fibers, it is difficult to use them as a raw material for thermoplastic recycling due to lack of compatibility in melt mixing. On the other hand, in the case of nylon carpets, a large amount of nitrogen (Nitrogen) Therefore, it is difficult to incinerate the amount of NOx generated during burning within the regulation range of the government environment. Therefore, it is difficult to dispose of the incineration, and the landfill disposal method is mainly used. However, since the limit of disposal landfill and disposal cost and important natural biodegradability are poor, Are becoming increasingly difficult to handle or become industrial wastes.

Therefore, in developed countries such as the US, research on the use of nylon or polyester as a raw material by conversion of nylon fiber and polyester fiber into solvents by separation and hydrolysis of raw material monomers is actively conducted, but there are many problems in terms of economy In the future, there is a desperate need for a new concept treatment method for deriving excellent physical and chemical properties of nylon fibers, polyester fibers and polypropylene fibers of these waste carpets.

Disclosure of the Invention The present invention has been conceived to overcome the problems of the prior art as described above, and it is an object of the present invention to provide a FRAC and a FRC which are characterized by having inherent characteristics of nylon fiber, polyester fiber and polypropylene fiber of waste carpets as a raw material of synthetic fibers, We have developed a waste carpet fiber regeneration technology that can secure fiber length and fiber volume occupancy that can be matched to the performance of FRAC and FRC without substantially destroying it and substituting such recycled fiber with virgin fiber of FRAC and FRC Waste recycle fiber for fiber reinforced asphalt / cement concrete, which can reduce the initial cost of new concept that can solve the environmental problems, and can recycle resources, give a good circulation, And a fiber reinforced asphalt / cement concrete composition using the same.

In order to accomplish the above object, the present invention provides a method of manufacturing recycled waste carpet fibers for fiber reinforced asphalt / cement concrete, comprising the steps of: preparing a waste carpet; preparing a waste carpet using the shredder to a predetermined size Shredding the shredded waste carpet pieces and fibrousizing the shredded waste carpet fragments using a Hammer Mill or a Comminuter.

Here, in the step of preparing the waste sludge, a plurality of waste carpets may be selected from a carpet having a nylon surface fiber-polypropylene backing fiber structure, a nylon surface fiber-polyester base yarn ( A carpet having a backing fiber structure, and a carpet having a polyester fiber-polyester fiber backing fiber structure.

It is preferable that the regenerated fiber is any one of nylon-polyester mixed fiber, nylon-polypropylene mixed fiber and polyester fiber.

In the shredding step, it is preferable that the fiber-reinforced asphalt concrete is 5-20 mm and the fiber-reinforced cement concrete is 5-15 mm.

In addition, the waste carpet regenerated fiber for fiber reinforced concrete manufactured by the above manufacturing method is provided.

In addition, when the addition amount of the regenerated fiber produced by the above-mentioned production method is 0.1 to 0.5 wt% based on the total weight of the fiber reinforced asphalt concrete (FRAC), the total weight of the fiber reinforced cement concrete (FRC) By weight to 0.01% by weight to 1.0% by weight.

According to the new waste carpet regenerated fiber utilizing technology and the composition using the same, the fiber reinforced fiber reinforced concrete is being examined for the purpose of improving the strength of the asphalt concrete road pavement material, the cement concrete construction material and the industrial material, In the case of virgin synthetic fibers, such as nylon, polyester, and polypropylene, which are raw materials of the system, recycled waste carpets that have been completely disposed of by landfill are replaced with fibers for fiber reinforcement, thereby reducing resource circulation and industrial pollution It is possible to improve the economic efficiency and secure the longevity improvement function.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.
2 is a schematic diagram showing a typical structure of a carpet, ① composed of a surface layer yarn (Face fiber), ② 1 primary base yarn (1 ^st Backing fiber), ③ binder (Bonding material), ④ 2 primary base yarn (2 ^nd Backing fiber) do.
3 is a photograph showing the regenerated fiber form of the present invention.
(FRAC) and fiber-reinforced cement concrete (FRC) using the waste carpet regenerated fiber according to the present invention, wherein (a) is a FRAC specimen of the present invention, (b) is a FRAC (C) is a photograph of the fiber distribution of the cross section of the red FRC.

Hereinafter, the present invention will be described in detail.

The present invention relates to a comparatively expensive virgin synthetic material such as nylon, polyester, and polypropylene, which is a raw material of a fiber reinforced system that is being seriously examined for the purpose of improving the strength and life span of ascon, concrete, Recycled waste carpets, which are now being landfilled and disused, can be recycled as fibers for fiber reinforcement, thereby improving economic efficiency as well as reducing resource recycling and industrial pollution. In addition, the second generation of Ascon design technology Fiber reinforced asphalt concrete (FRAC), which is excellent in workability and has excellent resistance to plasticity change due to cone stiffness and low temperature crack resistance, and fiber reinforced cement concrete (FRC), which has excellent tensile strength and crack resistance, Possible technical features.

According to the technique of the present invention, the waste carpet is separated and collected from a nylon carpet and a polyester carpet, and each carpet is subjected to a predetermined fiber length specification within a range of 1 mm to 30 mm so as to be compatible with FRAC and FRC Cutting a waste carpet piece adjusted to a predetermined size through a Hammer mill or a Comminuter to obtain a nylon-polyester mixed fiber of the present invention. The fiber recycling technology is characterized in that the physical-chemical properties inherent to each fiber are expressed in fibers, polyester fibers, and nylon-polyolefin mixed fibers.

According to a preferred embodiment of the present invention, in the evaluation of the performance of the waste carpet regenerated fiber, in the case of FRAC, a comparative test with a conventional virgin fiber and a comparison test with a second generation ascon was conducted by the Ministry of Land, [Production and Construction Guidelines], [Drained Asphalt Mixture Production and Construction Guideline], published in April 2009 [SMA Packaging Production and Construction Guideline], and for FRC, Cement concrete pavement production and construction guidelines].

According to a preferred embodiment of the present invention, in the performance evaluation, stability stability of the high-temperature plasticity change between the second-generation Ascon and the FRAC according to the presence or absence of the fiber reinforcement described above is evaluated by the PG grade of the binder itself and the wheel- And the stability of low temperature crack resistance was judged by the PG grade of the binder itself.

In case of cement concrete, tensile strength change and toughness index of concrete and FRC were calculated according to presence or absence of fiber reinforcement.

According to a preferred embodiment of the present invention, the type and fiber length of the waste carpet regenerated fiber are classified into a range of 1 to 5 mm, a range of 5 to 15 mm, and a range of 15 to 30 mm, The effect of fiber reinforcement was analyzed when the amount of fiber added was in the range of 0.01 ~ 1.0 wt% for FRAC and FRC.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, if the technical idea of the present invention is blurred or unclear due to a detailed description of the known configuration, the description of the configuration of the above-mentioned known will be omitted.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

As shown in FIG. 1, a method (S100) for manufacturing a waste carpet regenerated fiber for fiber reinforced asphalt / cement concrete comprises steps S10 and S10 of separating industrial and household waste carpets into nylon carpets and polyester carpets, The shredding of the waste carpet to a size of 20 mm or less by using a shredder and shredding of the carpet to a size of 15 mm or less in the case of FRC, A step S30 of forming a fiber using a hammer mill or a comminuter, and a step S40 of completing the product as a product. Each of the above steps will be described in detail below.

1) Separating and collecting nylon carpets and polyester carpets (S10)

The structure of a typical carpet, also use the surface layer, as in 2 (Face fiber) (①) , 1 car base yarn (1 ^st Backing fiber) (②), a binder (Bonding materials) (③), two car base yarn (2 ^nd backing fiber (④). Nylon carpet and polyester carpet are classified according to the type of the face fiber. Further, according to the method of binding the face fiber to the backing fiber, it is divided into a turf type and a needle punching type.

Generally, in the case of a carpet for daily use, a Turfted nylon carpet using SBR latex in which the surface fiber is nylon, the backing fiber is polypropylene fiber, and calcium carbonate is used as a binder, . In the case of industrial carpets, the face fiber is nylon, the backing fiber is polyester fiber, and the binder mainly comprises polyethylene nylon carpet (tufted nylon carpet) and face fiber Polyester fibers and backing fibers are also bonded to each other by needle punching as polyester fibers, and a polyester carpet, which is polyvinyl acetate, is used as a binder. Therefore, in order to produce three types of nylon-polypropylene mixed fibers, nylon-polyester mixed fibers, and polyester fibers during the regeneration of the fiber-reinforcing fiber of the present invention, There is a need.

2) shredding of waste carpet (S20)

The type of carpet is selected so that the waste carpet separated and collected in step S10 is collected in accordance with the use of the FRAC and the FRC, and then the size of the carpet is adjusted before the next carpet is introduced into the subsequent process step. (Preferably 5-20 mm) in the case of FRC and a maximum size of 15 mm (preferably 5-15 mm) in case of FRC

3) Fibersize step (S30)

Step S20 is a step of fiberizing the waste carpet pieces cut into a predetermined size using a hammer mill or a comminer. At this time, the pulverized binder is removed through a classifier, and the produced fibers are commercialized through a known quality control (see FIGS. 3 and 4).

The physical-chemical properties of the fibers obtained in the step S30 are summarized as follows.

Diameter (占 퐉) Length (mm) Tensile strength (MPa) Elastic modulus (GPa) Melting Point (° C) Density Water Absorb (%) nylon 43 5 ~ 16 970 5 200 ~ 220 1.14 2.8-5.0 Polyester 75 15-20 1100 17 260 1.38 0.4 Polypropylene 110 15-20 700 4 165 0.90 nil

In order to confirm the fiber-reinforced performance of the fibers regenerated from the waste carpet of the present invention as described above, the performance evaluation in the ascon was compared with the presence or absence of the fibers and the conventional virgin fiber in April 2009 Construction Guideline]. Particularly, to evaluate the performance of the plastic change resistance, the performance grade evaluation of the asphalt binder according to whether or not the recycled fiber of the present invention and virgin fiber and fiber were added was evaluated according to AASHTO T315 using the Rutting index, G? / Sin ? ), And the low temperature crack resistance evaluation was performed by measuring the BBR value at -12 ° C according to AASHTO T313. At the same time, the evaluation of the performance as the ascon was performed according to the KS F 2374 standard, .

In order to confirm the fiber-reinforced performance of the fibers recycled from the waste carpet of the present invention, the performance evaluation in concrete was compared with the presence or absence of fibers and virgin fibers in November, 2009 [Cement Concrete Pavement Production and Construction Guideline ] Standards. Particularly, in order to evaluate the tensile strength and the toughness index performance, the tensile strength performance of the concrete according to whether the waste recycled fiber of the present invention and virgin fiber or fiber were added or not was evaluated according to the KS F 2408 standard And the cracking resistance was determined by calculating the toughness index value according to ASTM C 1018-92.

≪ Example 1 >

Industrial Nylon BCF Tired waste carpet (face fiber = turfed BCF nylon fiber, backing fiber = Polyester fiber, Bonding materials = polyethylene resin) was shredded to a size of about 20 mm through a shredder, Bonding materials were separated and removed through a 16 mesh mesh sieve while fabricating into fibrous form by placing a Comminuter rotating regulator at 2 (rpm = 500) To obtain a nylon-polyester hybrid fiber of the present invention. The obtained nylon-polyester hybrid fiber had a denier of 15, a nylon fiber having a fiber length of 5 to 16 mm, a polyester fiber having a denier of 55 denier and a fiber length of 15 to 20 mm, 35% by weight.

≪ Example 2 >

Polypropylene (Polypropylene) resin, polyester fiber, Bonding material = polyvinyl acetate resin was shredded to a size of about 20 mm through a shredder, Comminuter was set to 2 (rpm = 500) to prepare fibers. The powdered binder materials were separated and removed through a 16 mesh mesh sieve, and the upstream fibrous material was collected To prepare the polyester fiber of the present invention. The polyester fiber thus obtained is composed of 55 deniers and 100 wt% of polyester fibers having a fiber length of 15 to 20 mm.

   ≪ Application Example 1 &

In order to analyze the fiber-reinforcing performance obtained through Example 2 of the present invention, the polyester fiber and the virgin polyester fiber of Example 2 were added to the AP-5 asphalt binder AP-5 itself and AP-5, The performance of hot blended fiber reinforced asphalt binder was evaluated by DSR (Dynamic Shear Rheometer) value at high temperature according to AASHTO T315 standard and the degree of rutting index ( G ^* / sin δ ) The crack resistance was evaluated by measuring the BBR value at -12 ° C according to AASHTO T313. The values are summarized as follows.

AP-5 Example 2 Fiber Virgin
Polyester fiber
Specification
Original G ^* / sin? (KPa)
at 64 ° C
1.28
2,24
2.12
1.0 or higher


G ^* / sin? (KPa)
at 64 ° C
2.81
3.42
3.28
2.2 or higher G ^* x sin? (KPa)
at 25 ℃
4074
4160
4120
Below 5000 Stiffness (MPa)
At -12 ° C
217
232
224
300 or less m-Value
At -12 ° C
0.307
0.304
0.306
0.300 or more Performance Grade 64-22 64-22 64-22

As can be seen from the test results, the plastic index value (G ^* / sin 隆) of the pure asphalt binder AP-5 at 64 캜 was 1.28 KPa, whereas that of the polyester fiber of Example 2 was 1 wt% And 2.24 KPa in the case of reinforced asphalt binder, which means that the road surface temperature of the asphalt road shows a plastic change resistance superior to that of the pure asphalt binder by about 1.78 times at 64 ° C, which is a relatively high temperature, Value, which is equivalent to or higher than the value obtained by the above-described method. In addition, the value of m-value (meaning behavior value at -22 ° C) of minus 12 ° C which is characteristic of low-temperature cracking resistance is 0.304 and the stiffness value is 300 MPa or less. It was found that the resistance was sufficiently exhibited. In conclusion, FRAC using waste carpet regenerated fiber, which is the object of the present invention, not only can replace virgin fiber but also exhibits excellent plasticity resistance against a system using pure asphalt binder used in the second generation ascon design method Could know.

≪ Application Example 2 >

On the basis of the above test results, a performance test as an ascon was carried out for the formulation of SMA (Stone Mastic Asphalt), which is an ascon, which is most influenced by the conic system of the asphalt binder. This SMA formulation test was conducted in April 2011 [SMA Packaging Production and Construction Guideline] in compliance with raw materials and evaluation method. In particular, SAM 13 mm was used as the aggregate, and the asphalt binder used was AP-5 at about 6.2 wt% (large aggregate weight), the hot mixing temperature was 165 DEG C, .

At this time, in the case of the test standard SMA blend, it is usual to add about 0.3 part by weight of cellulose fiber to 100 parts by weight of the total SMA asconone. The added cellulose fiber is AP-5 which is an asphalt binder But it is an essential material used for the purpose of drainage down from the aggregate due to adsorption. However, since the cellulose fibers on the chemical molecular structure are hydrophilic, they are susceptible to moisture, The tensile stress due to the interlocking between the fibers in the so-called ascon is inferior due to the weak tensile force of the tensile stress.

The performance test in this SMA formulation was carried out by replacing virgin fibers by the same amount for comparison with the Example 2 fibers of the present invention on the basis of the standard SMA blend using typical cellulose fibers, The results of performance tests of fiber SMA and virgin SMA are shown in Table 3 below.

Existing SMA Example 2 SMA Virgin fiber SMA AP-5 addition amount (%) 6.2 6.2 6.2
Fiber Fiber type Cellulose Polyester Polyester Addition amount (%) 0.3 0.3 0.3





Performance evaluation
Marshall dynamic stability (N) 9,000 11,700 11,200 Wheel Tracking
(Times / mm) 3,025 4,150 4,070 Indirect tensile strength (σmax)
(KPa) 998 1,020 1,005 3 Cycle Residual tensile strength (KPa) 490 918 925 Fracture Energy
(KPa) 4.57 8.52 8.56

As can be seen from the test results, the Marshall dynamic stability and wheel tracking values of the waste carpet regeneration fiber FRAC and virgin fiber FRAC of the present invention as compared with the conventional SMA were improved by about 1.3 to 1.37 times , Especially the value of the fracture energy which is a measure value of the road life span was improved to about 1.86 times, so that the fiber reinforcing effect for the purpose of the present invention was excellent. In addition, from the viewpoint of moisture sensitivity, After immersing in water for 2 hours at 25 ° C for 22 hours at 60 ° C, the residual tensile strength was measured after 3 cycles to approximate the actual state. As a result, the effect of cellulose fibers, which are hydrophilic, Cycle residual tensile strength is reduced to about 48%, which is less than the design standard of 75%, and there is a risk of moisture breakage. On the other hand, If the fiber is extremely satisfactory value was derived as about 90%.

As shown in Table 1, the waste carpet regenerated fiber of the present invention is a lipophilic fiber having a water absorption rate of 0.4% or less and has a tensile strength of 1,100 MPa of the fiber itself, Is maintained at a temperature of 260 ° C or higher in the range of 150 to 180 ° C, which is the operating temperature of the asconone, and at the same time, the hydrophilic cellulose fiber used in the conventional SMA has polarity repulsive property with the lipophilic property of the asphalt binder AP- The weakness of wetting was also solved, and the effect of FRIN as a reinforcing mechanism by reinforcing the interconnection of inter-fiber interlocking in SMA asphalt binder was evident. And that the expression of these genes is expressed.

<Application Example 3>

In order to confirm the fiber-reinforcing performance of the Example 1 fiber regenerated from the waste carpet of the present invention, the performance evaluation in the concrete was compared with virgin fiber presence and virgin (virgin 0 fiber, published in November 2009, cement concrete packaging production and construction The evaluation of tensile strength of concrete according to the presence or absence of recycled fiber, virgin fiber and fiber of the present invention was carried out on a Lab scale according to [Standard Specification of Packing Concrete] The bending strength was measured according to the F 2408 standard and the cracking resistance was determined by calculating the toughness index value according to the American Society for Testing and Materials (ASTM) C 1018-92 standard. As shown in Table 4.

existing Example 1 Fiber FRC Virgin nylon


combination



25 mm coarse aggregate 1,162 1,162 1,162 Sand Fine Aggregate 683 683 683 OPC 293 293 293 Fly ash 2 species 73 73 73 High performance water reducing agent (PC) 1.1 1.1 1.1 fiber - 2.08 2.08 Purified water 128 140 140 Sum 2340.1 2354.18 2354.18 Evaluation of compound
Slump (mm) 40 42 42 Air (%) 5.2 5.3 5.3

Performance evaluation
Compressive strength (MPa) 29.3 32.9 32.7 Flexural strength (MPa) 5.2 6.5 6.4 Tensile Strength (MPa) 1.97 2.10 2.12 Toughness Indices (I5) 4.47 5.94 5.93

As a result of the test, the nylon-polyester hybrid fiber FRC of Example 1 of the present invention and the virgin nylon FRC of the present invention were compared with the conventional packing concrete in the same manner The strength of the concrete is increased by about 6.6 ~ 25% compared with that of the conventional concrete. However, the strength of the concrete is higher than that of the conventional concrete. And that the FRC of the present invention was improved by about 32.9% compared to conventional concrete, that is, the toughness indices, which is a measure of the crack resistance due to expansion and shrinkage

This is because the fiber FRC performance of the present invention exhibits durability due to excellent improvement of shear load durability by improvement of shear strength, that is, bending strength and tensile strength, which is the disadvantage of conventional concrete almost equal to virgin fiber, And it can be substituted for virgin fiber. Thus, the object of the present invention can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

Claims (6)

Preparing a waste carpet,
Shredding the prepared waste carpet to a size of 5-20 mm for a fiber reinforced asphalt concrete using a shredder and 5-15 mm for a fiber reinforced cement concrete,
The shredded waste carpet pieces are made into a fibrous shape using a Hammer Mill or Comminuter while separating and removing the pulverized binding materials through a sieve, And collecting the fibrous material and collecting the fibrous material and collecting the fibrous material in the fibrous reinforced asphalt / cement concrete. The method according to claim 1,
In the step of preparing the waste carpet, a carpet having a nylon surface fiber-polypropylene backing fiber structure, a nylon surface fiber-polyester fiber backing fiber ) And a carpet having a polyester fiber-polyester fiber backing fiber structure, characterized in that it further comprises the step of separating the waste carpet into a carpet having a structure of a fiber reinforced asphalt / Method of making fiber. The method according to claim 1,
Wherein the regenerated fiber is one of a nylon-polyester mixed fiber, a nylon-polypropylene mixed fiber and a polyester fiber. delete delete delete

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