KR101635327B1

KR101635327B1 - Construction method for reparing paved road

Info

Publication number: KR101635327B1
Application number: KR1020150150627A
Authority: KR
Inventors: 문의성; 문영규; 김두병; 이재준; 성은희
Original assignee: 주식회사 로드씰; 주식회사 화신; (유)로드텍
Priority date: 2015-10-29
Filing date: 2015-10-29
Publication date: 2016-07-08

Abstract

An overlay step of forming an overlay layer on a pavement where cracks are generated on the surface; And a crack repairing step of repairing the part where the crack is generated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of repairing a pavement, and more particularly, to a method of repairing a road by performing a pavement on a pavement where cracking occurs.

Generally, the pavement is constructed by paving asphalt concrete mixed with asphalt and aggregate, or by cement concrete packed with cement concrete mixed with cement and aggregate. The repair of the old pavement road is reinforced by overlaying pavement It is universal. At this time, the repair of cracks occurring on the surface of the existing pavement is performed before the pavement pavement is performed. Crack repair is performed by forming a repair groove in the crack region and filling the repair groove with a sealant. When the overlaying is carried out without repairing the cracks, the cracks in the overlaying layer are transferred to the overlaying layer. FIG. 1 shows a cross-sectional structure of a paved reinforced pavement by a conventional method. 1, a repair groove 12 is formed on the surface of the existing pavement 11 in correspondence with a cracked portion (not shown), the repair groove 12 is filled with a sealant 13, 14 cover the existing pavement road 11 and the sealant 13. However, secondary cracks often occur at positions corresponding to the sealant 13 in the overlay layer 14, and improvement is required.

A maintenance method for solving the problem of the overlayed asphalt pavement layer of the aged concrete road emerged as follows. The shrinkage and expansion behavior of the concrete road due to the temperature change due to the joint material and the material to be repaired in the cracked part of the aged concrete road, There is a problem that secondary defects such as pothole and reflection cracks of the overlaid asbestos pavement layer occur frequently because the adhesive strength to the surface and the physical properties that can accommodate the stress due to the vehicle load are not clearly shown. Therefore, a new approach is needed to effectively solve the problem caused by the cracked portion of the pavement on the pavement covered with overlay such as Ascon.

An object of the present invention is to provide a pavement repair method using a pavement method for suppressing the occurrence of secondary cracks and a new sealant therefor.

According to an aspect of the present invention, there is provided an overlaying method for forming an overlay layer on a pavement where cracks are generated on a surface; And a crack repairing step of performing a repair of the cracked part.

According to an embodiment of the present invention, the crack repairing step may include: a repair groove forming step of forming a repair groove penetrating the overlaid layer and the pavement corresponding to the cracked part; And a sealant filling step of filling the repair groove with a sealant.

In one embodiment of the present invention, the pavement repair method further comprises locating cracks occurring on the existing pavement covered by the overlay layer before performing the repair grooving step.

In one embodiment of the present invention, the sealant comprises 100 parts by weight of asphalt, 10 to 30 parts by weight of a thermoplastic elastomer, 1 to 30 parts by weight of an adhesion promoter, 1 to 20 parts by weight of an acrylic copolymer, 5 to 40 parts by weight of a superabsorbent resin, 1 to 5 parts by weight of a plasticizer, and 1 to 10 parts by weight of a carbon fiber chip.

According to the present invention, all of the objects of the present invention described above can be achieved. Specifically, the joints and cracks of the old concrete roads with overlapping layers are filled with and adhered with high adhesion asphalt type sealant (reflection cracking inhibitor) using carbon fiber, so that after the overlay layer is formed, Secondary cracks due to cracks can be prevented.

In addition, a high adhesion asphalt sealant (reflection cracking inhibitor) using carbon fiber can form a one-shot behavior with the pavement due to low temperature flexibility and excellent adhesion to the winter environment. In particular, the swollen behavior of the self-expanding compound containing the superabsorbent polymer on the pavement crack adhesion portion and the poor adhesion to the pavement layer by blocking the flow of the fluid to the succeeding crack portion of the pavement layer through optimization of the self- And the problem of leakage phenomena in which additional cracks may occur can be solved. In addition, a rubberized asphalt mixture was developed by applying thermoplastic elastomers, plasticizers, and other special additives to the asphalt. To increase the tensile strength and surface abrasion of the asphalt mixture, a carbon fiber chip was continuously dispersed in a continuous asphalt mixture The use of carbon fiber, which has excellent heat resistance, adhesion, low temperature flexibility and surface abrasion, by dispersing uniform carbon fiber chips in the form of fine particles on the surface, is used for injection cracking of various civil structures such as packaging, bridges, This can contribute to extending the life of the structure. It is easy to work with quick dry type and has excellent weatherability and abrasion resistance. It has no flammability and non-toxicity (including lead, chrome, mercury, cadmium, etc.) by improving the tensile strength of asphalt coating by selective introduction of carbon fiber chip. ) Is environmentally friendly. Further, the carbon fibers uniformly dispersed by the radiant heat irradiated by the infrared lamp are absorbed and radiated by the carbon fibers, so that the uniform and rapid heating and curing of the sealant becomes possible.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a cross-sectional structure of a paved road repaired by a conventional road maintenance method; FIG.
2 is a flowchart illustrating a road maintenance method according to an embodiment of the present invention.
3 is a view showing an example of a sectional structure of a paved road repaired by the road maintenance method shown in Fig.
4 is a photograph of a carbon fiber chip used in a sealant according to an embodiment of the present invention.
FIG. 5 is a schematic view showing a water leakage blocking structure after absorption-swelling for encapsulation simulation of superabsorbent polymer particles in a sealant for repairing cracks and adhesions using carbon fibers according to the present invention. FIG.
FIG. 6 is a schematic diagram illustrating the water expansion behavior of a sealant for repairing a high adhesion crack using the carbon fiber of the present invention. FIG.
7 is an internal schematic diagram of the sealant according to the present invention.

Hereinafter, the configuration and operation of the embodiment of the present invention will be described in detail with reference to the drawings.

As described above, the overlay layer, such as ascon, is laminated on pavement roads such as old concrete roads as described above, and then the repair grooves are formed in the cracks and / or joints formed on the pavement. The repair grooves penetrate through the overlay layer Is set on the pavement. Thereafter, a sealant in which the carbon fiber chips are dispersed is filled and installed in the repair grooves. This prevents secondary cracking due to crack boom occurring after overlay layer formation.

Furthermore, the tensile strength of the asphalt coating film is improved by the selective introduction of carbon fiber chips, so that it is easy to work with quick-drying type which is quick drying and excellent in weatherability and abrasion resistance, and has no flammability and non-toxic (lead, chromium, mercury, cadmium Etc.) are environmentally friendly. In addition, by providing a sealant of the same material as the sealant filled in the repair groove before the overlay layer construction, it is possible to protect the repair groove from the mechanical damage occurring in the overlay layer construction such as the ascon, and furthermore, It is possible to completely fill in the maintenance sound by refilling the uncharged part of the repair groove occurring at the time of curing after the injection.

2 is a flowchart of a road maintenance method according to an embodiment of the present invention.

Referring to FIG. 2, the road repairing method according to an embodiment of the present invention includes an overlaying step (S10), a repairing groove forming step (S20), and a sealant filling step (S30).

In an embodiment of the present invention, in the overlaying step S10, an overlay layer is formed on an existing pavement where joints and cracks are formed on the surface.

A detailed method of forming the overlay layer is the same as that used in the conventional overlay package, so a detailed description thereof will be omitted. After the overlaying step S10 is completed, a repair groove forming step S20 is performed.

In the repair groove forming step (S20), a repair groove is formed in the joint region or the crack region of the existing pavement.

The repair grooves are formed by removing grooves in the existing pavement and grooved portions in the overlaying layer. The repair grooves are formed by using routers routinely used in line repair work. .

The method for repairing a road according to an embodiment of the present invention further includes the step of determining the location of the joint portion or the cracked portion formed on the existing pavement covered by the overlaying layer before performing the repair groove forming step .

In an embodiment of the present invention, the location of the joints or cracks may be determined by marking the joints of the existing concrete roads at both ends of the road, then overlaying the existing concrete roads, and then covering the joints marked with the laser leveling The way to mark lines on asphalt pavement surfaces can be identified.

After the repair grooves are formed in the repair groove forming step S20, the sealant filling step S30 is performed. In the sealant filling step S30, in the embodiment of the present invention, The asphalt-based sealant filled with molten carbon fiber is filled in the repair groove formed through the through hole.

In one embodiment of the present invention, the sealant used in the sealant filling step includes a high adhesion asphalt sealant utilizing carbon fibers having excellent heat resistance, adhesion, low temperature flexibility and surface abrasion.

In order to improve the adhesiveness of the sealant in the repair groove before the sealant is filled, it is preferable that the foreign matter such as dust remaining in the repair groove and the heating operation for the repair groove are performed first. Removal of foreign matter in the repair groove may be performed simultaneously with formation of the repair groove. As a result, the dust generated by the cutter in the process of forming the repair grooves is sucked by the dust collector immediately after the formation of the repair grooves, so that foreign matter such as dust is not left in the repair grooves do.

3 shows a sectional structure of a paved road repaired by the road maintenance method of the present invention.

3, the overlay layer 200 is formed on the existing pavement 100 through the overlaying step (10 of FIG. 2). The overlaying layer 200 is formed on the existing pavement 100 The repair grooves 300 are formed by removing the portions including the cracks (not shown) and the portions covering the cracks (not shown) in the overlaying layer 200 in the mold 100. The repair grooves 300 are formed through the sealant filling step S30. A sealant (400) is filled in the groove (300).

Hereinafter, a high adhesion asphalt based sealant using carbon fiber used to extend the durability life of the overcast ascon of the old concrete road according to an embodiment of the present invention will be described in detail.

The present invention utilizes a carbon fiber chip having high heat resistance and excellent heat resistance in order to prevent secondary cracks occurring between the repair groove and the overlaying layer as described above.

FIG. 4 is a photograph of a carbon fiber chip used in a sealant according to an embodiment of the present invention, and Table 1 summarizes physical properties of a carbon fiber chip used in an embodiment of the present invention.

Length (mm)
(Lenght) 1-3 Unit Diameter (μm)
(Filament Diameter) 7.0 Tensile Strength (GPa)
(Tensile Strength) 2.8-3.0 Tensile modulus (GPa)
(Tensile Modulus) 220-240 Carbon content (%)
(Carbon content) ≥ 95% Volume resistivity (Ω / cm)
(Electrical Resistivity) 1.5 ㅧ 10-3 Density (g / cm3)
(Density) 1.6-1.76 Elasticity (%)
(Sizing Type & Amount) 1.5

However, the scope of the present invention is not limited to the physical properties of the carbon fiber chip shown in Table 1, and it is within the scope of the present invention as long as the carbon fiber is used for the sealant to improve the physical properties.

The sealant used in the pavement repair method according to the present invention is a highly adherent asphalt sealant using carbon fibers having excellent heat resistance, adhesive strength, low temperature flexibility and surface abrasion, and is used for adhesion of the sealant in the repair grooves before the sealant is filled. In order to improve the property, it is preferable that the foreign matter such as dust remaining in the maintenance groove and the heating operation for the maintenance groove are performed first.

Removal of foreign matter in the repair groove may be performed simultaneously with formation of the repair groove. As a result, the dust generated by the cutter in the process of forming the repair grooves is sucked by the dust collector immediately after the formation of the repair grooves, so that foreign matter such as dust is not left in the repair grooves do.

The sealant for repairing cracks in high adhesion using carbon fibers according to an embodiment of the present invention may comprise 100 parts by weight of asphalt, 10 to 30 parts by weight of a thermoplastic elastomer, 1 to 30 parts by weight of an adhesion promoter, 1 to 20 parts by weight of an acrylic copolymer, 5 to 40 parts by weight of a superabsorbent resin, 1 to 5 parts by weight of a plasticizer, and 1 to 10 parts by weight of a carbon fiber chip described above

The sealant for repairing cracks in high adhesion using carbon fibers according to an embodiment of the present invention comprises 100 parts by weight of asphalt, 10 to 30 parts by weight of a thermoplastic elastomer, 1 to 30 parts by weight of an adhesion promoter, 1 to 20 parts by weight of an acrylic copolymer, 5 to 40 parts by weight of a water absorbent resin, 1 to 5 parts by weight of a plasticizer, and 1 to 10 parts by weight of a carbon fiber chip.

The sealant for repairing a high adhesion crack using carbon fibers constituting the present invention includes a thermoplastic elastomer. If the amount of the thermoplastic elastomer is less than 10 parts by weight, the viscoelasticity and elongation of the asphalt mixture may be poor, and the low temperature flexibility may be poor. When the amount of the thermoplastic elastomer is more than 50 parts by weight, The viscoelasticity increases, but the asphalt content tends to be too low to adhere to the base surface, and additionally, dispersion difficulties in addition to the addition of the high absorption polymer are caused.

The high-adhesion crack repair sealant constituting the present invention includes a carbon fiber chip (Carbon Fiber chip) as described above. The carbon fiber chip according to an embodiment of the present invention preferably has 1 to 10 parts by weight of the thermoplastic elastomer in an amount of 100 parts by weight of the asphalt used. When the amount is less than 1 part by weight, the tensile strength, elasticity, heat resistance, tensile strength, The surface abrasion is hardly improved, and the heat generation characteristic is insignificant when the lamp is heated. On the other hand, when the amount exceeds 10 parts by weight, tensile strength and surface abrasion are increased, but the carbon fiber chip content is too large to adhere to the base surface, and additionally, dispersion of addition of other functional additives is difficult. In addition, the carbon fiber chip has a length of 1 to 3 mm. When the length is shorter than the above range, the tensile strength improvement is insignificant. .

The sealant for repairing cracks using carbon fibers constituting the present invention includes a plasticizer for improving low temperature brittleness, mixing and processability. The low temperature brittleness enhances the flexibility in the low temperature environment of the asphalt mixture and the increase in the low temperature flexibility is caused by the temperature change of the package layer due to the expansion and contraction Can be improved.

The content of the plasticizer contained in the composition of the present invention is preferably 1 to 10 parts by weight. If the content of the plasticizer is less than 1 part by weight, the low-temperature embrittlement and the miscibility of the asphalt mixture are not improved. If the amount is more than 10 parts by weight, the adhesion of the composition deteriorates and the material separation occurs at high temperature.

FIG. 5 is a schematic view showing a water leakage blocking structure after absorption-swelling for encapsulation simulation of superabsorbent polymer particles in a sealant for repairing cracks and adhesions utilizing carbon fibers according to the present invention.

That is, the pressure-sensitive adhesive enhancer contained in the sealant composition for repairing cracks in high adhesion cracks using the carbon fiber according to the present invention is a water-soluble polymer resin that increases the adhesiveness of the asphalt mixture and induces the capsule effect of the hydrophilic high- polyvinyl alcohol, polyvinyl acetate, vinyl acetate resin, polyacrylamide, polyvinyl pyrrolidone, and the like may be used.

If the content of the adhesive agent is less than 1 part by weight, the effect of addition is insufficient. As a result, the cohesive force between the asphalt mixture and the superabsorbent polymer is decreased, and the absorption and swelling There occurs a phenomenon that the post sealant is lost by the water pressure. If the amount exceeds 30 parts by weight, the viscosity and the adhesion of the composition excessively increase, and there is a problem that defects in the processing of the sealant for repairing the adhesion cracks using carbon fibers occur .

FIG. 6 is a schematic diagram illustrating the water expansion behavior of a sealant for repairing a high adhesion crack using the carbon fiber of the present invention. FIG.

Referring to FIG. 6, the tackifier used in the sealant according to the present invention increases the cohesive force between the hydrophobic asphalt mixture and the highly hydrophilic high-absorbency polymer and causes the effect of simulating the coated capsule structure on the super-absorbent polymer surface, 3, the conventional water-swellable sealant composition using bentonite or superabsorbent polymer can solve the problem of loss of sealant due to abrupt volume expansion and lack of cohesive force due to swelling, and addition of the pressure-sensitive adhesive enhancer encapsulates the surface of the superabsorbent polymer So as to control the absorption expansion behavior and the swelling speed.

Acrylic ester, acrylic styrene copolymer, and acrylic ester copolymer, which are included in the sealant composition for repairing cracks in high adhesion cracks utilizing the carbon fiber of the present invention to improve the adhesion of the asphalt mixture and improve the water resistance of the surface of the water- acrylic-styrene copolymer, acrylic copolymer, and the like.

The content of the acrylic copolymer contained in the composition of the present invention is 1 part by weight to 20 parts by weight. When the amount is less than 1 part by weight, the addition effect is not so much, and the surface water resistance of the water-soluble polymer particles is not improved But the viscosity of the asphalt mixture of more than 20 parts by weight is increased but the viscosity is increased and the absorption swelling of the superabsorbent polymer is delayed.

The superabsorbent polymer (SAP) contained in the sealant composition for repairing cracks in high adhesion using the carbon fiber of the present invention has a gel blocking phenomenon as an adhesion characteristic between polymer particles from moisture introduced from the outside At least one selected from the group consisting of sodium polyacrylic acid, polyacrylamide, methacrylic acid, and ethylene oxide may be used. In one embodiment of the present invention, the superabsorbent polymer is typically acrylic acid crosslinked sodium polyacrylate and has a density of 0.6 to 0.8 g / ml, a particle size distribution of 150 to 850 탆, a water retention capacity of 40 g / g Or more, a pressure absorption capacity (0.3 psi) of 22 g / g or more, and a residual monomer amount of 300 ppm or less.

The content of the superabsorbent polymer contained in the composition of the present invention is 5 parts by weight to 40 parts by weight. When the content is less than 5 parts by weight, the self-expanding compound has insufficient absorption and swelling effect, The water absorption performance is lowered due to the separation of the material of the sealant for high adhesion crack repair using the carbon fiber after absorption due to the increase in the viscosity and the excessive volume swelling of the superabsorbent polymer. do.

In the present invention, the asphalt constituting the sealant for repairing cracks in high-adhesion cracking using carbon fibers preferably has a softening point of 30 to 100 캜 and an invasion degree of 30 to 175 dmm in terms of increasing the adhesion strength with the pavement surface , A softening point of 50 to 70 占 폚 and an intrusion of 50 to 90 dmm.

The amount of the asphalt used is preferably 50 to 80% by weight of the sealant, and if it is less than 50% by weight, the content of the asphalt is poor, and if it exceeds 80% by weight, the strength and adhesive strength are increased but the low temperature brittleness is increased. Cracks and heat resistance of the waterproofing material are deteriorated, and the waterproofing material may flow down in a high temperature environment in the summer. For the sake of convenience, the composition of the sealant in this specification refers to the weight of the remaining additive with 100 parts by weight of the asphalt in the above weight percent range.

In order to prevent the sealant for repairing cracks at high temperatures and the occurrence of cracking of the sealant at a low temperature, the softening point should be increased as well as the elasticity should be increased.

Therefore, the sealant for repairing cracks in high adhesion using the carbon fiber of the present invention includes a thermoplastic synthetic rubber and a carbon fiber chip in order to increase elasticity, heat resistance, tensile strength and surface wear. The thermoplastic synthetic rubber and the carbon fiber chip form a network with the asphalt to improve the interfacial adhesion to increase the elasticity, heat resistance, tensile strength and surface wear of the sealant. The increase in elasticity, heat resistance, tensile strength, It is possible to remarkably reduce the generation of cracks and breakage due to external impact in a cold environment in winter.

The thermoplastic elastomer contained in the sealant for repairing cracks in high adhesion using the carbon fiber of the present invention is preferably 10 to 30 parts by weight based on 100 parts by weight of the asphalt. If the content of the thermoplastic synthetic rubber is less than 10 parts by weight, the elasticity and heat resistance of the sealant hardly improve. If the content of the thermoplastic synthetic rubber exceeds 30 parts by weight, the adhesive strength decreases and the viscosity increases excessively.

According to the present invention, the synthetic rubber as the thermoplastic elastomer is completely melted and dispersed in asphalt at a high temperature (160 to 180 ° C) by high-speed mixing with a high shear mixer or the like to form a homogeneous network structure , The elasticity, low-temperature flexibility and mechanical strength are increased as the content thereof increases, but it is more preferable to add 5 to 15% by weight because it is relatively expensive as compared with asphalt.

According to the present invention, the carbon fiber chips are completely dispersed in asphalt by high-speed mixing with a high shear mixer at a high temperature (160 to 180 ° C) to form a homogeneous network structure, The tensile strength, the surface abrasion and the mechanical strength are increased, but the range is appropriate because it is relatively higher than the asphalt.

The tackifier contained in the sealant for repairing cracks in high adhesion using the carbon fiber of the present invention includes polyisoprene rubber or butyl rubber to increase the adhesive strength. The tackifier preferably acts to increase the curability of the sealant, to cope with the behavior of the matrix (endothelial performance) and to the pavement, and the tackifier content is preferably 5 to 30% by weight. If the content of the tackifier is less than 5% by weight, there is almost no addition effect for improving the adhesion performance and adhesion performance, and the performance of the tackifier is lowered, But the mechanical properties such as tensile strength and tear strength tends to be lowered.

As a plasticizer selectively contained in the sealant for repairing cracks in high adhesion using the carbon fiber of the present invention, 1 to 20% by weight of the processing oil is preferable. The processing oil is characterized in that it improves the processing performance in the process of manufacturing a sealant for high adhesion cracking repair using carbon fibers and maintains low temperature flexibility in the winter season. If the amount of the plasticizer is less than 1 wt%, the asphalt compound processability is lowered and the low-temperature flexibility is deteriorated. If the plasticizer content is more than 20 wt%, the adhesive force is drastically decreased due to excessive oil addition, There is a problem.

Accordingly, the present invention can develop a one-piece structure of the pavement surface and the silane with the low temperature flexibility and excellent adhesive force against the winter environment by developing a sealant for repairing a high adhesion crack using carbon fiber. In particular, the swollen behavior of the self-expanding compound containing the superabsorbent polymer on the pavement crack adhesion portion and the poor adhesion to the pavement layer by blocking the flow of the fluid to the succeeding crack portion of the pavement layer through optimization of the self- And the problem of leakage phenomena in which additional cracks may occur can be solved.

In order to increase the tensile strength and surface abrasion, carbon fiber chips are dispersed in the form of fine particles of a uniform carbon fiber chip on a continuous asphalt mixture by dispersion stabilization technology, so that carbon having superior heat resistance, adhesive strength, low temperature flexibility and surface abrasion Sealant for repairing cracks using fiber The sealant for repairing cement is used to prevent the occurrence of potholes that can contribute to the extension of the structure life by injecting and laying out cracks in various civil structures such as pavement, bridge and culvert. And to provide a crack repairing material.

As described above, the composition of the sealant composition according to one embodiment of the present invention improves the physical properties of the sealant using asphalt as a base material and a carbon fiber chip having excellent compatibility with asphalt (see FIG. 7). Furthermore, curing with an infrared lamp can be performed to maximize radiation heating by the carbon fiber chip and heating effect of the heat sink.

100: existing pavement
200: Overlay
300: repair home
400: sealant

Claims

An overlay step of forming an overlay layer on a pavement where cracks are generated on the surface; And
And a crack repairing step of repairing the cracked portion,
Wherein the crack repairing step comprises: a repair groove forming step of forming a repair groove penetrating through the overlaying layer and the pavement corresponding to the cracked part; And
And a sealant filling step of filling the repair groove with a sealant,
Wherein the sealant comprises 100 parts by weight of asphalt, 10 to 30 parts by weight of a thermoplastic elastomer, 1 to 30 parts by weight of an adhesion promoter, 1 to 20 parts by weight of an acrylic copolymer, 5 to 40 parts by weight of a superabsorbent resin, 1 to 5 parts by weight of a plasticizer, 1 to 10 parts by weight of a carbon fiber chip having a thickness of 1 to 3 mm,
The superabsorbent resin is at least one selected from the group consisting of sodium polyacrylic acid, polyacrylamide, methacrylic acid, and ethylene oxide,
The tackifier may be a water-soluble polymer resin which increases the adhesion of the asphalt mixture and induces a capsule effect on the surface of the hydrophilic superabsorbent resin, such as polyvinyl alcohol, polyvinyl acetate, vinyl acetate resin, polyacrylamide wherein the at least one selected from the group consisting of polyacrylamide and polyvinyl pyrrolidone.

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The method according to claim 1,
Further comprising the step of determining a position of a crack occurring on an existing pavement covered by the overlay layer before performing the repair groove forming step.

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