WO2014209000A1

WO2014209000A1 - Method for repairing damaged part of expansion joint for concrete road

Info

Publication number: WO2014209000A1
Application number: PCT/KR2014/005606
Authority: WO
Inventors: 최동현
Original assignee: 로드켐 주식회사; 박혜정
Priority date: 2013-06-28
Filing date: 2014-06-25
Publication date: 2014-12-31
Also published as: KR101323022B1; CN105378184A

Abstract

The present invention relates to a method for repairing a damaged part of an expansion joint for a concrete road and, more particularly to, a method for repairing a damaged part of an expansion joint for a concrete road, comprising: an epoxy mortar plastering step for filling a damaged part by plastering, with epoxy mortar, a damaged concrete part of an joint formed so as to be expanded in a concrete road; an urethane mortar filling step for filling the joint with urethane mortar; and an urethane injection step for injecting the rapid-hardening urethane into a joint of an upper part of the urethane mortar. According to this method, it is possible to reduce required construction time by excluding processes for cutting, crushing, and high-pressure-cleaning existing concrete and the like and by quickening a curing speed of a repairing material, provide excellent binding force with an existing road pavement material, obtain waterproof properties for preventing water permeation, and further improve durability even though a dynamic load of a vehicle is repetitively generated since the repaired road surfaces are connected to each other.

Description

Repair method of expansion joint damaged part for concrete road

The present invention relates to a method for repairing a stretch joint breakage portion for a concrete road to repair the concrete broken portion of the stretch joint portion of the concrete road.

In general, automobile roads can be largely classified into asphalt pavement and concrete pavement, and concrete used for concrete pavement according to the present invention is poured with reinforced concrete. Concrete roads are exposed to sunlight and new construction occurs all summer and winter. As temperature changes, freezing and thawing are repeated, it is common to install expansion joints around 10 ~ 20m in the longitudinal direction.

Pavement of concrete road is installed with reinforcing bars, and high-strength concrete is poured and machine leveling is performed using surface leveler. At this time, the upper part of the surface is composed of plain concrete, and the expansion joint is installed every 10 ~ 20m in every lane to prepare for the expansion of contraction in summer and winter.

Concrete roads may be partially damaged due to various factors, such as lack of compaction or poor mix quality of cement and aggregate, such as lack of quality control during paving, and environmental effects such as construction in winter. Breakage or cracking occurs.

For example, when there is insufficient pavement cross section or unstable bottom layer or roadbed, fatigue fracture phenomenon occurs due to excessive load concentration caused by the load of automobile, etc. As the season changes, the volume expands during freezing and the volume decreases during thawing, resulting in the aggregate falling from the pavement due to the decrease in aggregate strength of the aggregate, causing the part of the concrete road to fall off the stretch joint. .

As such, when there is a partial breakage or cracking of the pavement surface, there is a problem of not only impairing the riding comfort of the vehicle operator, but also causing an accident due to an unexpected impact on the vehicle.

In the conventional concrete road joint repair method is, for example, the repair method proposed in the "joint repair construction method of concrete road" of the Republic of Korea Patent Publication No. 2009-0043631 (Patent Document 1), the surface layer portion damaged or cracked of the road Cutting, shredding, sintering mortar on it, and then chopped and plastered.

However, the repair method and general repair method of Patent Literature 1 require a cutting machine, water, a Breca, a generator car, a water washer, etc. to cut concrete, and a support vehicle for placing concrete after cutting and cleaning, ultrafast mortar, gravel, and on-site. A lot of equipment is needed, such as a blender, water and a plastering machine.

Moreover, to repair the small part as a palm, the construction method that cuts the concrete road around 50cm in width and impacts it to the normal part is carried out until now.However, this method blocks or restricts the traffic for a long time. In addition, the cohesion of the boundary between the existing road surface and the resurfaced material is weakened, resulting in excessive durability and maintenance costs due to weak durability such as easily damaged or detached resurfaced parts and existing concrete joints. There is this.

[Patent Documents]

1. Korean Unexamined Patent Publication No. 2009-0043631 (published on May 5, 2009)

The first object of the present invention devised to solve the problems of the prior art is to restore the damaged part of the narrow narrow range in the direction of expansion and contraction of the palm as well as the relatively wide range of partial damage in the concrete road Providing repair materials to make it possible, but excluding the cutting process of concrete and plastering fast epoxy epoxy mortar, which is a mixture of fast epoxy and silica sand, can speed up the hardening of the repair and shorten the time required for construction. The expansion joint is installed using high strength / high elasticity urethane and urethane mortar in the expansion joint to provide a repair method for the expansion joint breakage part for the concrete road which has excellent cohesion with existing road pavement and has waterproofness to prevent water from seeping. will be.

The second object of the present invention, for the concrete road to further improve the durability of the existing concrete or newly installed fast-hard mortar of the expansion joint due to the high tensile strength and high elongation of the road surface repaired using the repair material It is to provide a repair method for the expansion joint breakage.

The present invention for achieving the first object of the stretch joint using a urethane mortar mixed with a high-strength, high-elasticity of the exposure-only urethane and a high-strength, high-elasticity of the exposure-only urethane and silica sand in a volume ratio of 1: 2 to 1: 4: The lower part is formed, and the upper part of the expansion joint is made of high-strength, high elasticity-only urethane.

The surface aggregate of concrete around the expansion joint is partially or intensively damaged by using fast-hard epoxy mortar containing epoxy and silica sand in a volume ratio of 1: 2 ~ 1: 4 to restore the surface by plastering on the dropped surface. . At this time, the pot life time of epoxy hard mortar mixed with epoxy and silica sand by volume ratio 1: 0, 1: 1, 1: 2, 1: 3, 1: 4, 1: 5 is 20 minutes, 60 minutes, 3 hours, 5 hours, 6 hours. In fact, at 30 ° C, curing is completed in 30 minutes.

The present invention for achieving the second object, using the fast-hard epoxy mortar mixed epoxy and silica sand in a volume ratio of 1: 2 to 1: 4, the concrete surface aggregate around the stretch joint is partially or intensively broken off. Plastering on one surface restores the surface. At this time, the separation material was installed to form the expansion joint, and the urethane mortar was plastered at the bottom and pushed into it, and the fastening urethane was filled thereon, and the epoxy mortar restored the original shape by plastering the broken surface of the concrete around the existing joint. Apply seamlessly to a mass on the surface. At this time, the tensile strength of urethane is 203 kg / ㎠, elongation is 550%, tear strength is 42kg / cm, HS hardness is 73, and the lead is 94K.U.

According to the present invention, since the silica sand and the fast curing epoxy contained in the repairing material are mixed, the compressive strength and the adhesive force, which are the characteristics of the epoxy, are added, thereby increasing the cohesion of the repairing material itself as well as the existing packaging, and the epoxy is the most As it is an excellent waterproofing material, even if the water penetrated into the repaired package repeats its expansion or contraction according to the seasonal change, epoxy mortar is filled in the dropped part between the crushed stone and the cement included in the concrete road to restore the surface. There is an advantage that the durability of the sieve and the existing concrete road is improved.

In addition, the fast-hardening epoxy contained in the repairing material cures quickly after pavement repair and paving, and eliminates preliminary processes such as cutting, crushing, waste collection, water cleaning, and drying, which are used to pour concrete. This can minimize the vehicle travel time limit.

It is crucial to protect the epoxy mortar by applying urethane seamlessly over the repaired epoxy mortar while installing the expansion joint, and by installing a high-strength urethane expansion joint to prevent the epoxy mortar from being pushed in the driving direction of the vehicle. Significantly decreases. In addition, according to the road repair method according to the present invention, the epoxy mortar is applied to the pavement, the water does not penetrate into the pavement by the urethane waterproofing material, as well as the urethane is shock-absorbing action on the surface of the epoxy mortar breakage By improving the durability, the maintenance cost of the road can be reduced, thereby reducing the social cost loss.

1 is a cross-sectional view showing a damaged portion in which the concrete around the expansion joint partially dropped from the existing road pavement.

FIG. 2 is a cross-sectional view of a state in which a concrete dropout part of a joint road of a concrete road according to the present invention is plastered with a fast-hard epoxy mortar and then filled with urethane mortar and urethane at a joint part and urethane is applied to an epoxy mortar.

Figure 3 is a block diagram showing step by step repair process of a concrete road according to the present invention.

4 is a conceptual diagram physically expressing the change in load according to the movement direction and the load direction.

[Description of the code]

10 ... Original Package

10a ... breakage

20. Repair Package

20a ... urethane mortar

20b ... urethane

20c ... epoxy mortar

The present invention may be modified in various ways and may have various embodiments. Hereinafter, the present invention will be described in detail with reference to exemplary structures of the present invention. However, this is not intended to limit the present invention only to the illustrated form, and the spirit and scope of the present invention should be understood to include ordinary changes, equivalents, and substitutes of the illustrated forms.

Repairing material for concrete road joints and broken concrete around joints according to the present invention is to repair the damaged parts in the form of broken and concentrated pit or wide bottom surface of the road partly broken around the joint part on the entire surface It is a repair material for.

First, as a repair material for repairing the concrete breakage around the joint of the concrete road, epoxy mortar, urethane mortar, and urethane made of fast-hard epoxy and silica sand may be used.

Placing the damaged part of the concrete road with epoxy mortar using the repair material, filling the joints with urethane mortar and fast curing urethane, and applying urethane successively to the epoxy mortar to form a seamless repair paving body, and existing road and repair paving body. Form a waterproof layer on the entire surface, including.

The particle size of the silica sand forming the repair material is 20 to 100 mesh and the mixing ratio of epoxy and silica sand can be calculated by the test conditions.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a cross-sectional view showing a broken part partially broken in the entire surface of a concrete road used in the prior art.

As shown in FIG. 1, the joint part of the existing package 10 may be partially or completely damaged by a load and an impact received when the vehicle passes, and the damaged part 10a may be formed by the damaged part 10a. It needs to be repaired so as not to interfere with communication.

The existing pavement 10 refers to a general concrete road layer, and the breakage portion 10a refers to a portion of the existing pavement 10 that is partially broken and broken off as shown in the figure.

If the concrete around the joint of the existing pavement 10 is partially broken and a breakage portion 10a is formed, a dynamic load is applied to the bottom of the breakage portion 10a during the passage of the vehicle, and thus the broken edge concrete is only damaged again. In addition, if the depression is applied to the vehicle to damage the vehicle or in severe cases there is a risk that the vehicle may fall or roll over, so as to emergency construction of asphalt repair material to the damaged portion (10a). However, since the emergency repair cannot coincide with the concrete surface, it is shocked again and the edges begin to fall off again.

In order to repair the broken concrete, the road is under full control, crushed with Breca, high pressure washing and superhard mortar is used to repair the road.

However, this method has a disadvantage in that the construction range is wide because the super-speed mortar is rebuilt by crushing a larger area 5 to 10 times larger than the breakage portion 10a.

Even if there is a defect, the original concrete is completed and passes through the normal curing period. Therefore, the concrete in its original state may be said to have the best physicochemical performance. In the above method, wet surface is formed because the cured carbide mortar is not cured, and in this case, there is a high possibility that there will be a fault again. As such, the repair method must be installed close to half of the driving line, resulting in longer air and higher costs.

2 is a cross-sectional view of a state in which the concrete part of the joint of the concrete road according to the present invention is plastered with fast-hard epoxy mortar and then filled with urethane mortar and urethane in the joint and urethane is applied to the epoxy mortar, Figure 3 is a block diagram showing step by step repair process of a concrete road according to the present invention.

As shown in Figures 2 and 3, the joint repair method of the concrete pavement of the present invention, the epoxy mortar plastering to fill the damaged portion by placing the separation material on the joint in which the damaged part is placed and plastering the epoxy mortar (20c) in the damaged part Step (S1), the urethane mortar filling step (S2) of filling the urethane mortar (20a) in the joint after removing the separation material during curing of the epoxy mortar (20c), and belonging to the joint of the upper part of the urethane mortar (20a) Urethane injection step (S3) for injecting a rigid urethane (20b).

In a more preferred embodiment, the repairing method of the present invention further includes a urethane packaging step (S4) of further applying a fast curing urethane (20b) on top of the fast curing urethane (20b) and the epoxy mortar (20c) on the packaging. can do.

In the epoxy mortar plastering step (S1), the separation material is placed on the joint to plaster the fast-hard epoxy mortar (20c), and when the curing starts, the separation material is removed so that the joint part comes out. In this case, it is possible to perform plastering by leveling the epoxy mortar 20c to the existing floor as it is in the broken state without breaking the concrete in which the defect is no longer generated. At this time, before plastering the epoxy mortar (20c), the separation material such as a wooden rod is first placed in the existing joint position, and when the curing starts after plastering the epoxy mortar (20c), it is possible to secure the construction space of the joint. .

The fast curing epoxy mortar (20c) is a mixture of fast curing epoxy and silica sand, silica sand is used in the 20 to 100 mesh, the fast curing epoxy is 4-nonylphenol (4-Nonylphenol) 5% by weight of the main component 11 to 19% by weight of aminoethylpiperazine, 12% by weight of fatty acid polyamide, 64 to 72% by weight of bis-polymer, 20 to 33% by volume of epoxy And may be mixed with silica sand 67 ~ 80% by volume, but the present invention is not limited thereto.

The urethane mortar filling step (S2) is a step of filling the urethane mortar (20a) to the lower part of the joint filling, where the urethane mortar (20a) is 25 ~ 33% by volume of high-strength high-strength urethane / silica sand 67 ~ It is prepared by mixing at 75% by volume.

If the urethane (20b) of the subsequent process is installed immediately without forming the urethane mortar (20a) in the lower part of the joint, the urethane liquid flows through the gaps of the existing expansion joints, so that the surface becomes pitted. This must first be constructed. Urethane mortar 20a filled in the lower end of the joint as in the present invention can prevent the urethane (20b) liquid filled in the upper end of the joint flows down to complete the construction at a time.

The urethane injection step (S3) is a process for filling the liquid quick-curing urethane (20b) does not contain silica sand to the upper end of the remaining joint, the remaining joint is filled horizontally with only the liquid urethane (20b).

The urethane packaging step (S4), by applying a liquid urethane (20b) filled in the joint upper end to the epoxy mortar (20c) to form a seamless waterproof flooring surface from the joint to the epoxy mortar (20c), The epoxy mortar 20c is coated with urethane 20b filled with a joint horizontally along the surface where the epoxy mortar 20c is plastered. In this case, no defect occurs by forming a seamless waterproof floor from the joint to the upper end of the epoxy mortar (20c).

Carbide mortar repair materials have been generalized by mixing cemented carbide cement and sand gravel on site. The material is generally produced and used at the same time by the cement manufacturer. However, the existing repair materials not only have a structure in which water enters the interface but also start to break again when the boundary is repeatedly impacted by the impact of traffic. It is a concept of restoring damaged surfaces only, and not a defective concept. As in the present invention, there is no concept of a conventional repairing material that has a compressive strength, adhesion strength, waterproofness, shock absorbency, and anti-rolling function while restoring the surface.

The compounding ratio of the quick-setting epoxy mortar (20c) that is the water-retaining material can be mixed in 20 to 33% by volume, 80 to 67% by volume of silica sand of 20 to 100 mesh.

The blending ratio exemplified herein is an optimum numerical range in consideration of pot life, curing drying time, compressive strength, and adhesive strength of the repairing material, as in the following test example, wherein the present invention is a fast curing epoxy mortar mixed with a fast curing epoxy and silica sand. It is to be understood that when the epoxy mortar repair material is manufactured by applying the fast-hardening epoxy and silica sand exemplified above, it is within the scope of the present invention even if it is outside the above-described range of compounding values.

As shown in FIGS. 1 and 2, when the fast epoxy mortar 20c in which the fast epoxy and the silica sand are mixed to fill the damaged part 10a is plastered on the damaged part 10a, the fast epoxy mortar 20c is fast. It cures within the pot life and completely cures and dries within 8 hours, so that the traffic flow can be partially controlled to provide partial repairs or total repairs. At this time, the curing drying time depends on the temperature, so when the concrete floor is actually heated by sunlight and the temperature rises, it can be cured and dried in a shorter time to pass the vehicle as soon as possible. In the summer of 30 ° C, the work can be completed in 30 minutes. If you use a hot air fan, you can cure it within 30 minutes to 1 hour until night or early winter.

Fast curing epoxy mortar (20c) for forming the repair package 20 as shown in Figure 3 is mixed in the field using a drum mixer or a drill mixer and rubbed on the floor as if plastering using a trowel or rubber trowel, etc. To be implemented. At this time, the plastering is applied only once to complete the work, and only the damaged part 10a of the existing package 10 is plastered to fill a horizontal plane with the existing floor. .

If the repair package 20 is cured after a certain time can be used immediately.

On the other hand, the repair package 20 is made of fast-hard epoxy and silica sand and form a stretch joint with urethane, so the tensile strength and elongation is better than conventional silicone stretch joints do not push. As the road moves forward, the road pushes the concrete floor in the direction of movement as the vehicle moves forward, so the force pushing the concrete forward always occurs.

As a result, the asphalt is pushed up the concrete at the interface between the asphalt and the concrete, which is not ductile, like asphalt, can not be pushed up and breaks apart. At this time, when forming a stretch joint with a conventional silicone sealant, its own tensile strength is very weak and it is easily stretched even when pulled by human hands. There is no at all.

On the other hand, the high-strength, high-elasticity quick-curing urethane (20b) according to the present invention is a tensile strength of 150 kg / ㎠ or more, elongation 400% or more interpreted this means that it is as hard as steel but elastic like elastic. In other words, when the driving force is pushed from the edge of the concrete to the expansion joint, it means that the tensile strength is more than 150 kg / ㎠ so that it cannot be pushed out unless it is such a large force. This is not happening.

If we cut a piece of paper in the air with two hands, it is very easy to tear it, but even if it is a piece of paper placed on a desk and cannot be torn no matter how hard it is, it is impossible to tear a piece of paper easily. This is a very important principle that should be applied to the repair of concrete dropouts around expansion joints.

In other words, if the elastic joint member is in close contact with the repaired concrete flooring material without being pushed by the dynamic load due to excellent tensile strength, as in the present invention, the repaired material that has been repaired once will not fall again and only the frictional force at the constructed interface will be good. You can endure it. In order to prevent the breakage of the interface, the urethane used in the upper expansion joint is applied to the epoxy mortar and connected to the existing concrete floor.Therefore, it does not apply any impact to the joint seam, and urethane absorbs the shock, which greatly reduces the risk of falling of the interface. It is a completely new concept of construction.

Physically, as shown in Figure 4, let us assume that the amount of force on the floor is constant and the direction of the car speed increases in the low, medium, high speed direction.

At low speed as in (a), the amount of kinetic energy applied horizontally is not high because the vehicle load is mostly downward. As shown in (b), when the vehicle is changed to medium speed, the vehicle load decreases, while the kinetic energy increases, the horizontal pushing force increases. As shown in (c), it can be seen that the force due to the downward load is greatly reduced and the kinetic energy applied horizontally is increased.

The same concrete facet on the highway is the obvious answer to why only so many toxic edges are broken and not so much in the middle. In the middle, the force caused by the downward pressure of the vehicle is greatly reduced and the force applied horizontally is greatly increased. However, if the floor is in close contact with the back, it is difficult to tear a sheet of paper as described above. Much less concrete is supporting from behind like shoulders, but it cannot be broken.

On the other hand, on highways running at high speeds, a thin formless silicone sealant is installed on the edge. Thus, edge concrete has no backing force.

Also, we might think that the wheels are rolling because they are rubber wheels, but in fact they hit the floor and pass by. In the case of heavy trucks, if the tire edges are circled, two-thirds of them are tire rubber and one-third of the air passes. Thus, one tire seems to roll continuously, but in reality one third is empty, so two-thirds of the tire passes by, one-third of the rest passes, and another two-thirds of the tires pass by one after another.

If a large force is applied horizontally as shown in (c) of FIG. 4 and a striking force is continuously applied to it, cracks are inevitably partially generated, and the cracks are generated to cause breakage.

Considering the fact that most vehicles run in the lane without stepping on the lane and change the lane only when the concrete joint breaks out at the edge centered on the joint, the focus point of the present invention is very new and creative. It can be said.

Urethane and urethane 20b included in the urethane mortar 20a is preferably a product having a tensile strength of 150 kg / cm 2 or more and an elongation of 400% or more, but the urethane mortar 20a and the urethane 20b may be stretched even if the product is less than the limit. Of course, the concept of seamless use must be widely recognized.

EXAMPLE

In order to prepare the fast-curing urethane mortar (20a), first, a high-strength, high-elasticity urethane 33% by volume, a mixture of silica sand having a particle size of 20 to 100 mesh 67% by volume, and a high-speed, high-strength, high-elasticity urethane 20% by volume, particle diameter Urethane mortar mixed with 80% by volume of this silica sand, which is 20 to 100 mesh, and high-strength, high-elasticity urethane, was prepared, and the high-strength, high-elasticity urethane was formed into a plate shape (hereinafter, abbreviated as 'maintenance joint') and cured. . A material was prepared by mixing 33% by volume of epoxy resin and 67% by volume of silica sand having a particle size of 20 to 100 mesh, and then mixing them in proportions, respectively, to block 50, 50, and 50 mm in width, length, and height (hereinafter, ' Abbreviated as 'maintenance block') and then cured.

In order to prepare a fast curing epoxy mortar (20c), first, a mixture of 20% by volume fast epoxy and 80% by volume silica sand having a particle diameter of 20 to 100 mesh, 25% by volume epoxy and 20 to 100 mesh particle size Prepare a mixture of 75% by volume of silica sand, 33% by volume of epoxy and 67% by volume of silica sand having a particle diameter of 20 to 100 mesh. , 50 and 50 mm blocks (hereinafter, abbreviated as 'repair material blocks') were molded and cured.

Tensile strength and elongation at break, tear strength, and hardness were tested by the Korea Institute of Chemical Convergence Testing as shown in Table 1 and Table 2.

The pot life, curing drying time, compressive strength, and adhesive strength of the repair material block were commissioned by the Korea Institute of Chemical Convergence Testing for each item, and tested according to specific test equipment and conditions by a suitable test method. The same result was obtained.

Table 1

Test Items	unit	Result	Test Methods
The tensile strength	kgf / cm3	203	KSF 3211-99
Elongation at break	%	550	KSF 3211-99
Tear strength	kgf / cm3	42	KSF 3211-99
Hardness, Hs	-	73	KSM 6518-96

Tensile Strength, Elongation, Tear Strength, Hardness of High Strength / High Elastic Urethane

TABLE 2

Test Items	unit	Result	Test Methods
lead	KU	94	ASTM D 562: 2001

LED of high strength, high elasticity urethane

TABLE 3

division	Test Items	Result value (h)	Test Methods
Sample 1-1 (100% by volume hard epoxy: 0% by volume silica sand)	Housework time	0.33	1. Pot life KS M 6030: 2009 / 2. Curing and drying time KS M 5000: 2009
	Curing and Drying Time	7
Sample 1-2 (fastening epoxy 33% by volume: silica sand 67% by volume)	Housework time	One
	Curing and Drying Time	7
Samples 1-3 (25% by volume fast epoxy: 75% by volume of silica sand)	Housework time	3
	Curing and Drying Time	8
Sample 1-4 (20% by volume hard epoxy: 80% by volume silica sand)	Housework time	5
	Cure drying time	10
Sample 1-5 (17% by volume hard epoxy: 83% by volume of silica sand)	Housework time	6
	Cure drying time	12

Pot life and hardening drying time of fast curing epoxy mortar

Table 4

division	Test Items	Result value (N / mm2)	Test Methods
Sample 2-1 (50% by volume hard epoxy: 50% by volume of silica sand)	Compressive strength	40.9	1. Compressive strength KS L 5105: 2007 / 2. Bonding strength Data Logger System
	Adhesion strength
Sample 2-2 (33% by volume hard epoxy: 67% by volume of silica sand)	Compressive strength	29
	Adhesion strength	2.05
Sample 2-3 (25% by volume fast epoxy: 75% by volume of silica sand)	Compressive strength
	Adhesion strength	1.5
Sample 2-4 (20% by volume of hard epoxy epoxy: 80% by volume of silica sand)	Compressive strength	20
	Adhesion strength	1.25
Sample 2-5 (17% by volume hard epoxy: 83% by volume of silica sand)	Compressive strength	10.4
	Adhesion strength	0.8

Compressive and Bond Strength of Fast Hard Epoxy Mortar

(1) Tensile strength, elongation rate, tear strength, hardness and lead of urethane

Tensile strength of the high-strength, high-elastic repair material joint according to the present invention is shown in Table 1, 203 kg / ㎠, elongation at break is 550%, tear strength is 42 kgf / cm, HB hardness is 73 and the degree of dilution Like 2, the center of gravity is 94 KU. Urethane with this characteristic is not low viscosity, so it can be applied well along the curvature and make urethane mortar to prevent the urethane from flowing down.

In general, the silicone sealant used has almost no elongation concept and only elongation concept, but the repairing material of the present invention has an elongation of 400% or more with a high tensile strength of 150 kg / cm 2 or more. Normal tensile strength of urethane is about 40 kg / ㎠.

(2) Compressive strength analysis

Compressive strength of the repair block according to the present invention was shown as 40.9, 29, 20, 10.4 N / ㎜ in Samples 2-1, 2-2, 2-4, 2-5, respectively, as shown in Table 4, the standard of the existing repair materials Considering that the compressive strength is 14.6 N / mm 2, it can be seen that the repairing material according to the present invention is suitable to apply Samples 2-1 to 2-4, and therefore, a fast-hard epoxy and silica applicable to an actual road. Sands were found to be suitable within the range of 20-33 vol% and 67-80 vol%.

(3) Attachment strength analysis

The adhesive strength of the repair material block according to the present invention, as shown in Table 4, the volume ratio of fast epoxy: silica sand is 2.05, 1.5, 1.25, 0.8 N / in samples 2-2, 2-3, 2-4, 2-5, respectively. Considering that the standard adhesion strength of the existing concrete flooring material is 0.8 N / mm2 or more, the repairing material according to the present invention has a larger adhesion strength than the existing asphalt block for road samples 2-2, 2-3, 2-4 As it can be seen that the interval of is suitable, the fast hard epoxy and silica sand that can be applied to the actual road was in the range of 20 to 33% by volume and 67 to 80% by volume.

(4) Analysis of pot life and curing drying time

The pot life of the repair material block according to the present invention is as shown in Table 3, the volume ratio of fast-hardening epoxy: silica sand is 0.33, 1, 3, 5, 6 hours in samples 1-1 to 1-5, respectively, the repair material according to the present invention The curing and drying time of the block is 7, 7, 8, 10, 12 hours in the volume ratio of fast-hardening epoxy: silica sand in samples 1-1 to 1-5, respectively.

Therefore, the first hardening time is 1 to 5 hours and the hardening drying time in which the curing is completely completed and dried can be seen that it is suitable to select a section of 7 to 10 hours, so that the fast curing epoxy suitable for the actual road application And silica sand resulted in a suitable range of 20 to 33% by volume and 67 to 80% by volume.

The curing and drying time of epoxy is very decisively affected by the temperature. In reality, the curing is carried out in a shorter time in this section because the asphalt is constructed under heat. 30 ° C. In summer, cures to dry in 30 minutes.

As described above, some embodiments of the present invention have been exemplarily described. However, the present invention is not limited to the above-described specific embodiments, and a part of the embodiments may be changed and mixed. Various modifications can be made by those skilled in the art without departing from the gist of the present invention, and such modifications can be separately understood from the technical spirit and the prospect of the present invention. Would not be.

Claims

As a repair method of the expansion joint breakage part for concrete road,

An epoxy mortar plastering step of filling the damaged part by plastering epoxy mortar mixed with a fast-hard epoxy and silica sand in the joint peripheral part;

Urethane mortar filling step of filling the urethane mortar mixed with fast-hard urethane and silica sand in the joint;

A urethane injection step of injecting fast-hardening urethane into the joint of the upper part of the urethane mortar;

A urethane packaging step of hardening by further applying a quick-curing urethane to the fast-curing urethane upper portion of the joint and the upper part of the epoxy mortar;

Are performed sequentially,

The urethane mortar is a repair method of the expansion joint breakage for concrete road, characterized in that the mixture of 25 to 33% by volume urethane and 67 to 75% by volume of silica sand having a particle diameter of 20 to 100 mesh.