KR102350828B1 - Ultra Rapid Room Temperature Hardening Repair Material and Method for Constructing Eco-Friendly Old Road Surface Integration Crack Repair Using the Same - Google Patents

Abstract

The present invention relates to a repair material capable of repairing a road surface crack occurring due to various causes and a construction method thereof, and to an eco-friendly crack repair/construction method for integration of an old road surface using an ultra rapid hardening repair material. The ultra rapid hardening repair material is characterized by comprising: a main component consisting of a compound modified by graft polymerization of 5-15 wt% of modified asphalt and 85-95 wt% of a room temperature hardening acrylic resin; and an ultra rapid room temperature hardening repair agent which includes 1-5 parts by weight of a hardening agent with respect to 100 parts by weight of the main component, wherein a road surface crack is filled with the repair material so that hardening is performed within 3-60 minutes. Accordingly, the present invention is applicable to the repair of a small road surface crack of 19 mm or less, there is no sense of foreignness felt by color different in the existing asphalt with a crack, and the repair material is rapidly softened by a temperature rise of the road surface in summer, thereby preventing strength degradation.

Description

Ultra Rapid Room Temperature Hardening Repair Material and Method for Constructing Eco-Friendly Old Road Surface Integration Crack Repair Using the Same

The present invention provides a repair material construction method for repairing road surface cracks caused by various causes,

A repair material made by chemically bonding PG 76-22 grade modified asphalt with acrylic resin and graft reaction, which is excellent in load resistance to automobile wheel load, heat resistance due to changes in road surface temperature, and heat flow resistance and low temperature stability, and a crack repair construction method using the same, thermoplastic melt The disadvantages of asphalt-based repair materials are insufficient strength, energy consumption due to construction after melting by heating method, difficulty in shortening working time, and the shortcomings of insufficient penetrability and fillability due to the rapid temperature drop that occurs when in contact with the substrate and the resulting increase in viscosity. A repair material capable of repairing not only initial cracks within 19 mm but also cracks wider than 19 mm by supplementing the weak elongation of existing room temperature hardening type MMA (short for methyl methacrylic) repair materials and road surface repair construction methods using them will be

The road crack repair construction method increases the maintenance cost due to rainwater penetration when the asphalt road cracks are left unattended. It is to suggest alternatives through various combinations of aggregates, silica sand and binders according to the size and shape of the material.

On the road surface, various causes and various types of cracks occur, such as fatigue cracks due to shrinkage and expansion due to temperature change, cracks at joints in pavement construction, and reflection cracks due to load. Portholes are reached, and in order to repair them, thermoplastic molten asphalt or pothole repair materials for casting on site are usually used.

Thermoplastic molten asphalt fills cracks within 30 mm and has the effect of blocking moisture from penetrating into cracks, but due to its high melt viscosity, it is difficult to fill cracks of 19 mm or less to a sufficient depth, and it is difficult to lower the viscosity. In addition to the problem, if the cracks become large, the phenomenon of being rolled off by the wheels of a vehicle running at high speed occurs frequently, and the pothole repair materials for casting on site are useful for emergency repair but not good in appearance. It can be seen that the cracks expand

Accordingly, the present invention takes advantage of asphalt and MMA (abbreviation of methyl methacrylic) to repair not only narrow cracks but also wide surfaces such as potholes, and a new crack repair material that can prevent material separation on the repair surface and its We would like to provide a construction method.

The crack repair material of the present invention contains 5 to 15 wt% of PG 76-22 grade modified asphalt, which is excellent in load resistance and heat-resisting fluidity and low-temperature stability due to changes in road surface temperature, and room temperature curing 100% reactive acrylic resin with excellent low-temperature flexibility and adhesion performance 85~ In order to realize rapid curing at room temperature with the main component composed of a compound modified by graft polymerization of 95% by weight, 1 to 5% by weight of a curing agent is added to the main component and cured within 3 to 60 minutes. . On the other hand, since most of the existing crack repair parts are coated with black gloss, unlike the existing repair materials that are in sharp contrast with the old gray road surface color and harm the aesthetics, the method of the present invention is hardened after the crack repair material of the present invention is applied. It is characterized in that it does not impair the aesthetics of the city by spraying and fixing the aggregate of a color similar to the old road surface before it becomes an old road surface and providing an integrated repair surface in appearance. This unintegrated appearance creates a sense of difference in aesthetics, and the existing crack repair material coated with black gloss is mistakenly recognized as a lane by the vehicle camera, which may cause errors in the lane maintenance assistance and lane departure prevention assistance systems.

In addition, most of the pavement construction joints have lanes, so when repairing with existing crack repair materials, the hardness of the repair material is low, so there is a disadvantage that the lane paint does not adhere to the repair surface.

Looking at the conventional technology used for uniform repair, it can be divided into a method in which a thermoplastic resin is melted and injected, and a room temperature curing method in which the resin is cured by reaction of the main agent and the curing agent without applying heat at room temperature.

The method of melting and injecting the thermoplastic resin includes Patent 10-1743397 Thermoplastic Elastomer Composition for Crack Repair and a maintenance method for road pavement using the same. It has the disadvantage of consuming a lot of time and heat for construction,

Patent 10-0869651 Road crack repair method using rubber palt is also melted and attached at 170~190℃, so it must be accompanied by a melting vehicle, and there are difficulties in small-scale partial repairs

As a two-component reactive crack repair material that is cured at room temperature, there is a patent 10-1160540 repair material for asphalt road and a road repair method using the same. Due to its low elasticity, another crack may occur at the edge after repair, and the curing time is at least 2 hours, making it difficult to repair large areas simultaneously.

Patent 10-1832939 Quick-drying crack injection composition for road crack repair Road crack repair method using the same It is made of methyl methacrylate as a main ingredient can

Patent 10-0391234 A composition for road pavement/crack repair that can be constructed in a thin layer using emulsified asphalt at room temperature, its manufacturing method, and a construction method using it have difficulty in

The present invention achieves low viscosity so that it can penetrate and fill cracks with a crack width of 19 mm or less at room temperature without going through a heating process to complete hardening only by reacting with a curing agent, thereby securing heat resistance and fluidity resistance by improving high heat resistance performance, and also, elongation It can prevent following cracks due to temperature change due to over 100% expression, and by spraying silica sand, there is no sense of heterogeneity during the repair and construction of old asphalt roads, so it does not impair the aesthetics of the road. The purpose of this is to improve the workability of the above road surface marking.

In order to solve the above problems, the crack repair material of the present invention contains 5 to 15 wt% of PG 76-22 grade modified asphalt, which is excellent in load resistance, heat resistance, fluidity resistance and low temperature stability according to changes in road surface temperature, and room temperature curing type with excellent low temperature flexibility and adhesion performance. By graft polymerization of 85 to 95% by weight of acrylic resin, physicochemical fusion of the unique properties of modified asphalt with those of room temperature curing acrylic resins to synergize each physicochemical property to improve flow resistance and lower viscosity. It was intended to provide a new concept crack repair material with both heat-resistant physical strength and an elongation of 100% or more by maintaining the normal temperature hardening characteristics and improving the penetration fillability for microcracks of 19 mm or less.

The present invention is effective in repairing not only small road surface cracks of 19 mm or less but also cracks in a wider range than this, and it is possible to implement an appearance without any sense of heterogeneity due to color difference in the existing asphalt where cracks have occurred, and various aggregates and The strength can be improved by mixing and applying silica sand.

In addition, it is possible to prevent the problem of falling off due to friction with the vehicle wheels due to the decrease in strength due to rapid softening due to the increase in the road surface temperature in summer, and the occurrence of cracks in the repair surface due to brittleness caused by low temperature in winter.

1 is a photograph of the performance evaluation state of the repair material penetration and filling for No. 3
2 is a photo of the simulation test results for evaluating the difference between the existing road surface and the existing road after construction of the repair material.
3 is a photo of a test construction case

A crack repair material according to an embodiment of the present invention is a main component composed of a compound modified by graft polymerization of 5 to 15 wt% of PG 76-22 grade modified asphalt and 85 to 95 wt% of a room temperature curing 100% reactive acrylic resin, and It is characterized in that 1 to 5 wt% of a curing agent is added and mixed during construction with respect to 100 parts by weight of the main component.

In one embodiment, PG 76-22 grade modified asphalt is synthetic resin or thermoplastic SBS copolymer, styrene-butadiene rubber (SBR) or styrene-isoprene-styrene (SIS) copolymer to general straight asphalt. As long as it is a modified asphalt that has been modified by more than one species and is public grade PG 76-22, any kind is not particularly limited.

In addition, in the present invention, the PG 76-22 grade modified asphalt serves to relieve low-temperature brittleness by improving the flexibility of the repair material, thereby increasing bonding stability at low temperature and at the same time increasing tensile strength and elongation.

In the present invention, when the content of the PG 76-22 grade modified asphalt is less than 5% by weight, flexibility of 100% or more of elongation cannot be obtained, and when it exceeds 15% by weight, it is difficult to penetrate and fill cracks of 19mm or less It is undesirable because it inhibits the curing of the rising and room temperature curing type acrylic resin, thereby impairing the heat resistance of the final cured physical properties.

In an embodiment, the room temperature curable 100% reactive acrylic resin is not particularly limited as long as it is a room temperature curable 100% reactive acrylic resin widely known in the art.

In the present invention, the room temperature curable 100% reactive acrylic resin has a low viscosity so that it can penetrate and fill cracks with a viscosity of 19 mm or less at room temperature even if the viscosity of the crack repair material is not heated like conventional thermoplastic molten asphalt. It not only satisfies the fillability, but also serves to easily control the traffic opening time by improving high tensile force and physical strength as it can be cured at room temperature with a curing agent at the same time.

In the present invention, when the content of the room temperature curable 100% reactive acrylic resin is 85% by weight or less, the viscosity is high, so it is difficult to lower the viscosity, and the room temperature reactivity is suppressed, which is not preferable. Penetration filling properties for cracks of 19 mm or less are very good, but it is not preferable because flexibility and elongation of 100% or more cannot be secured.

In particular, the crack repair material according to an embodiment of the present invention is modified by graft polymerization of 5 to 15% by weight of PG 76-22 grade modified asphalt and 85 to 95% by weight of a room temperature curing type 100% reactive acrylic resin, PG 76 Among the components in the -22 grade modified asphalt, the double bonds present in the molecules of the asphaltene component and the modifiers SBS, SIS, and SBR are replaced by a graft catalyst such as DCPO (Dicumyl peroxide) and BPO (Benzoyl Peroxide). Catalyst) is used to induce chemical bonds through double bond and graft reaction of 100% reactive acrylic resin to fuse the properties of PG 76-22 grade modified asphalt with 100% reactive acrylic resin It was characterized by synergizing chemical properties.

In the present invention, when the kraft reaction is not carried out, that is, only physical mixing occurs, the normal temperature curing agent is formed as a heterogeneous curing agent due to the occurrence of phase separation of the product and the difference in reactivity between the two materials, resulting in a decrease in tensile strength and less than 100% elongation. became undesirable.

In adding 1-5 wt% of a curing agent to the main component of the present invention,

The curing agent is not limited to any of BPO (Benzoyl Peroxide) or other peroxides as a reaction initiator of the subject, and it is within the above range by controlling the pot life according to the change of construction area and movement distance between construction sites and road surface temperature. operation in principle.

If the amount of the curing agent added is less than 1 wt %, the pot life is too long and the curing time is more than 1 hour, which is undesirable. .

In the performance evaluation of the present invention, in the case of Examples 1 to 3 and Comparative Example 1 and Comparative Example 2, 100 grams of about 2 weight of BPO (Benzoyl Peroxide) as a curing agent was homogeneously stirred to complete curing at room temperature. A performance evaluation test was performed on the specimen, and evaluation items were determined by measuring viscosity (CPS), tensile strength (MPa), and elongation (%).

In addition, in the evaluation of the 19 mm or less microcrack penetration filling performance of the present invention,

The crack filling performance as a crack repair material was evaluated by measuring the penetration filling depth for the No. 3 silica sand layer with a particle size of 1.6 to 2.5 mm.

In addition, when the construction method of the present invention is applied to the crack repair material with 0.25 to 2.5 mm size aggregate in the crack repair material construction to alleviate the sense of heterogeneity with the existing road surface after the crack repair construction of the repair material, a color matching simulation test with the existing aged road surface to evaluate the degree of heterogeneity.

<Example 1>

Set the reflux condenser in a clean 10 liter four-necked reaction flask, set the mantle heater and electronic thermometer set with the temperature controller, add 4,500 grams of 100% reactive acrylic resin (our SFA Base resin), and then add nitrogen to 0.5 500 g of PG 76-22 modified asphalt (SK) was added while liquid was added at a rate of liter/min, and the temperature of the reactant was raised to 80-85°C while homogeneously stirring at about 100 rpm.

After that, 4.5 grams of DCPO (Dicumyl Peroxide) was added at the same temperature to

The graft reaction was carried out for 1 hour to prepare Example 1 of the present invention.

<Example 2 ~ Example 4>

Examples 2 to 4 were prepared by using the same process as in Example 1 with the composition ratio as shown in Table 1 below.

<Comparative Example 1>

Comparative Example 1 was prepared by preparing in the same process as Example 1 with the composition ratio as shown in Table 1 below.

<Comparative Example 2>

Comparative Example 2 was prepared by simply mixing the composition ratio of Example 1 at room temperature without a graft reaction.

<Comparative Example 3>

A conventional thermoplastic molten asphalt-based repair material was used as Comparative Example 3

<Comparative Example 4>

A conventional room temperature curing type MMA resin-based auxiliary material was used as Comparative Example 4.

[Table 1]

As in the test results, when analyzing the expressed viscosity, which is an indicator of crack penetration filling properties, in the case of Examples 1 to 3, it shows a low viscosity in the range of 300 to 600 CPS, and the No. 3 penetration filling depth is 50 mm or more. It was confirmed that it exhibits excellent penetration filling performance for microcracks of 19 mm or less, which is the object of the present invention. On the other hand, in Comparative Example 1 of PG 76-22 grade modified asphalt content ratio of 15% by weight or more, the viscosity was as high as 2,000 CPS or more, so the No. 3 penetration filling depth was only about 5 mm, so crack penetration fillability of 19 mm or less This was undesirable because of the lack of this, and in particular, Comparative Example 3, which is an existing thermoplastic molten asphalt, is in a semi-solid state at 25°C, and energy is required to heat it to the operating temperature of 180°C, and at the same time, the viscosity at 180°C is 6,000 CPS or more. No. 3 penetration filling depth was less than 2 mm, and satisfactory penetration filling was not achieved even with relatively large cracks within 30 mm.

On the other hand, in the case of Comparative Example 2, the formulation was not subjected to a graft reaction at the same composition ratio as in Example 1, and the viscosity was lower than that of Example 1, but it was undesirable due to phase separation at room temperature, and at the same time, the room temperature curing agent was heterogeneous. It was not preferable because a phenomenon in which the tensile strength and elongation due to hardening decreased rather than occurred.

In addition, as can be seen from Comparative Example 4, in the case of the existing room temperature hardening type MMA-based repair material, low viscosity and high tensile strength sufficiently low for penetration and filling for cracks of 19 mm or less were expressed, but the elongation rate was very low as 12%. It was not preferable because the possibility of re-cracking and delamination during repeated stress due to lack of followability according to the thermal change of the phosphor road surface was very high.

Therefore, it was found that it is preferable to introduce a process of chemically bonding the PG 76-22 grade modified asphalt and the room temperature curing type 100% reactive acrylic resin by the graft reaction of the present invention.

In addition, when the construction method of the present invention is applied, as shown in Fig. 2, color matching with the existing old road is good, so after crack repair construction, the sense of heterogeneity of the road is alleviated, so that it can express the characteristic of improving the aesthetics after crack repair construction. there was.

Claims (2)

A main component composed of a compound modified by graft polymerization of 5 to 15% by weight of modified asphalt and 85 to 95% by weight of a room temperature curing acrylic resin;
Eco-friendly using an ultra-fast, light-hardening type repair material, characterized in that hardening takes place within 3 to 60 minutes by filling cracks in the road surface with an initial fast-hardening type repair material containing 1 to 5 parts by weight of a hardener added to 100 parts by weight of the main material. The old road surface integrated crack repair and construction method.
The method according to claim 1, wherein after filling the repair material into the cracks in the road surface, silica sand is sprayed to eliminate the sense of difference with the existing road surface and to improve the workability of the road surface marking in the crack repair part. Road surface integration crack repair and construction method.

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