Guss asphalt concrete composition with excellent crack resistance and construction method of the same

Abstract

The present invention relates to a goose asphalt concrete composition having excellent crack resistance and a method for constructing goose asphalt concrete using the same. Specifically, the above-mentioned goose asphalt concrete composition having excellent crack resistance comprises 85 to 90 weight% of aggregate and 10 to 15 weight% of asphalt binder, wherein the asphalt binder comprises 55 to 90 weight% of straight asphalt; 1 to 10 weight% of a chlorinated paraffinic plasticizer; and 5 to 40 weight% of a modifying admixture, and the modifying admixture comprises 1) 100 weight parts of synthetic rubber mixed with chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber in a weight ratio of 1:0.5 to 2:0.3 to 1.5; 2) 10 to 30 weight parts of polydopamine; and 3) 1 to 10 weight parts of gentiopicroside. 4) 1 to 10 parts by weight of triethyl citrate; 5) 1 to 10 parts by weight of isovaniloyl catalpol; and 6) 1 to 10 parts by weight of petroleum resin. Additionally, the above-described method for constructing goose asphalt concrete comprises the steps of: preparing a goose asphalt concrete composition with excellent crack resistance at a separate plant (S10); leveling the construction surface and removing impurities to form a construction section (S20); applying a primer composition to the upper part of the construction section to form a primer layer (S30); storing and transporting the prepared goose asphalt concrete composition with excellent crack resistance in a mobile storage device, and then laying it on the upper part of the primer layer to form a paving layer (S40); and curing (S50). This gust asphalt concrete composition with excellent crack resistance and the construction method using it control thermal deformation and thermal stress occurring at high temperatures to secure high cohesion and bonding strength, resulting in excellent adhesion, elasticity, and resilience. Consequently, the crack resistance and plastic deformation resistance of the constructed pavement layer are improved, and excellent long-term durability can be maintained as aging and spalling do not easily occur over a long period. Furthermore, it exhibits self-leveling characteristics that allow for leveling without separate compaction during the construction process, and has the effect of improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance.

Description

Technology Field

[0001] The present invention relates to a goose asphalt concrete composition with excellent crack resistance and a method for constructing goose asphalt concrete using the same, wherein high cohesion and high bonding strength are secured by controlling thermal deformation and thermal stress occurring at high temperatures, resulting in excellent adhesion, elasticity, and resilience, thereby improving crack resistance and plastic deformation resistance of the constructed pavement layer, maintaining excellent long-term durability by preventing aging and delamination from easily occurring over a long period, exhibiting self-leveling characteristics that allow for leveling without separate compaction during the construction process, and improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance. Background Technology

[0003] Generally, conventional hot-mix asphalt compositions, which are primarily used for road paving, cannot be laid using cold-climate construction methods performed at sub-zero temperatures during the winter. Furthermore, during the summer or when changes in temperature and load occur, phenomena such as rutting, longitudinal irregularities, corrugation, and leveling repeatedly take place, causing road cracks, potholes, and the spalling and detachment of aggregates, thereby reducing the road's lifespan.

[0004] Therefore, repaving, overlaying, and repairs are continuously repeated on average every 4 to 5 years, which has acted as a major factor in increasing the budget required for maintenance and repair each year compared to the national budget for paving new roads.

[0005] To address these issues, guss asphalt was developed, which exhibits excellent impermeability, durability, abrasion resistance, impact resistance, flexibility, skid resistance, and adhesion. Guss asphalt, also known as asphalt coule, is a special asphalt paving material developed in France; it is referred to as guss asphalt in Germany and Japan, and as asphalt mastic or mastic asphalt in the United Kingdom and the United States.

[0006] The above-mentioned goose asphalt composition is prepared by mixing aggregate, sand, stone powder, and a specially manufactured asphalt binder at a high temperature of 170 to 250°C, particularly 230 to 250°C. Unlike conventional asphalt solutions, the mixture possesses high bonding strength, durability, and water resistance capable of overcoming all disadvantages caused by changes in temperature or load. In particular, when a large amount of the composition is added and heated and mixed at a high temperature, the composition exhibits excellent fluidity, similar to lava flowing from a volcano, and can integrate the pavement layer without performing a compaction process as it cools naturally.

[0007] However, since the above-mentioned goose asphalt composition is constructed at high temperatures of 220°C or higher, it consumes a large amount of energy, poses a threat to worker safety, and can cause poor working conditions. Furthermore, there are problems in that the asphalt-based material hardens and aging accelerates during the process of being heated at high temperatures for a long time, which can lead to a decrease in the watertightness of the pavement layer. Additionally, plastic deformation may occasionally occur along the track before five years have passed since construction, causing serious driving problems; even if there are no plastic deformation issues, the pavement material gradually ages over time, eventually causing severe cracks and requiring periodic maintenance. Moreover, there is a problem in that it reduces the adhesion of the pavement due to the possibility of causing deformation of the steel deck plate, and thermal deformation and thermal stress occur in the steel deck plate, resulting in residual stress due to residual deformation remaining even after construction is completed, which adversely affects the quality of the steel deck plate bridge (such as reduced adhesion). Prior art literature

[0009] Republic of Korea Registered Patent No. 10-1934502 Republic of Korea Registered Patent No. 10-2011920 Republic of Korea Registered Patent No. 10-2289428 The problem to be solved

[0010] The present invention has been devised to solve the aforementioned problems. One embodiment of the present invention aims to provide a goose asphalt concrete composition with excellent crack resistance that controls thermal deformation and thermal stress occurring at high temperatures, thereby providing excellent adhesion, minimizing plastic deformation, preventing aging over a long period of time, and suppressing cracking and delamination, as well as a method for constructing goose asphalt concrete using the same.

[0011] The various problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0013] One embodiment of the present invention comprises 85 to 90 weight% of aggregate and 10 to 15 weight% of asphalt binder, and

[0014] The above asphalt binder contains 55 to 90 weight% of straight asphalt; 1 to 10 weight% of a chlorinated paraffinic plasticizer; and 5 to 40 weight% of a modifying admixture, and

[0015] The above modified admixture

[0016] 1) 100 parts by weight of synthetic rubber mixed with chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber in a weight ratio of 1 : 0.5 to 2 : 0.3 to 1.5; 2) 10 to 30 parts by weight of polydopamine; 3) 1 to 10 parts by weight of gentiopicroside; 4) triethyl citrate The present invention provides a goose asphalt concrete composition having excellent crack resistance, comprising 1 to 10 parts by weight; 5) 1 to 10 parts by weight of isovanilloyl catalpol; and 6) 1 to 10 parts by weight of petroleum resin.

[0017] The above synthetic rubber comprises 1 weight ratio of chlorosulfonated polyethylene synthetic rubber; 0.5 to 2 weight ratios of styrene-butadiene-styrene (SBS) synthetic rubber; and 0.3 to 1.5 weight ratios of styrene-ethylene-butylene-styrene (SEBS) synthetic rubber, with respect to

[0018] It may further mix 0.01 to 0.1 weight ratio of fluorosilicone synthetic rubber and 0.01 to 0.1 weight ratio of polyoctenamer synthetic rubber.

[0019] The above polydopamine is polydopamine containing basalt fibers, and

[0020] The polydopamine containing the basalt fiber comprises the step of preparing a mixture having a pH of 8 to 9 and a concentration of dopamine hydrochloride of 1 to 10 weight% by dissolving dopamine hydrochloride in Tris-base buffer;

[0021] It may be manufactured by a method comprising the step of mixing 1 to 20 parts by weight of basalt fibers with 100 parts by weight of the above mixture, stirring at room temperature for 20 to 30 hours, then centrifuging to separate the precipitate and washing to produce polydopamine containing basalt fibers.

[0022] The step of manufacturing the polydopamine containing the above basalt fiber may involve mixing 1 to 20 parts by weight of basalt fiber, 1 to 10 parts by weight of polyketone, 0.1 to 10 parts by weight of magnolol, and 1 to 5 parts by weight of trimethylpentaphenyl trisiloxane with respect to 100 parts by weight of the above mixture, stirring at room temperature for 20 to 30 hours, and then separating the precipitate by centrifugation and washing.

[0023] The above-mentioned modifying admixture may further contain 1 to 10 parts by weight of ethiodized oil per 100 parts by weight of the above-mentioned synthetic rubber.

[0024] Another embodiment of the present invention is a method for constructing goose asphalt concrete using the goose asphalt concrete composition having excellent crack resistance, wherein

[0025] A method for constructing goose asphalt concrete comprises the steps of: preparing a goose asphalt concrete composition with excellent crack resistance in a separate plant (S10); leveling the construction surface and removing impurities to form a construction section (S20); applying a primer composition to the upper part of the construction section to form a primer layer (S30); storing and transporting the prepared goose asphalt concrete composition with excellent crack resistance in a mobile storage device, and then laying it on the upper part of the primer layer to form a paving layer (S40); and curing (S50). Effects of the invention

[0027] A goose asphalt concrete composition with excellent crack resistance according to one embodiment of the present invention and a goose asphalt concrete construction method using the same have the effect of improving crack resistance and plastic deformation resistance of the constructed pavement layer by controlling thermal deformation and thermal stress generated at high temperatures to secure high cohesion and high bonding strength, thereby having excellent adhesion, elasticity, and resilience.

[0028] In addition, it has the effect of maintaining excellent long-term durability as aging and peeling do not easily occur over a long period of time, and exhibiting self-leveling characteristics that allow for leveling without separate compaction during the construction process.

[0029] In addition, it has the effect of improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance. Brief explanation of the drawing

[0031] FIG. 1 illustrates a goose asphalt concrete paving method using a goose asphalt concrete composition with excellent crack resistance according to one embodiment of the present invention. Specific details for implementing the invention

[0032] Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and are not intended to limit the present invention, and the present invention is defined only by the scope of the claims set forth below.

[0033] One embodiment of the present invention comprises 85 to 90 weight% of aggregate and 10 to 15 weight% of asphalt binder, and

[0034] The above asphalt binder contains 55 to 90 weight% of straight asphalt; 1 to 10 weight% of a chlorinated paraffinic plasticizer; and 5 to 40 weight% of a modifying admixture, and

[0035] The above-mentioned modifying admixture comprises: 1) 100 parts by weight of synthetic rubber mixed with chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber in a weight ratio of 1:0.5 to 2:0.3 to 1.5; 2) 10 to 30 parts by weight of polydopamine; 3) 1 to 10 parts by weight of gentiopicroside; and 4) triethyl citrate The present invention provides a goose asphalt concrete composition having excellent crack resistance, comprising 1 to 10 parts by weight; 5) 1 to 10 parts by weight of isovanilloyl catalpol; and 6) 1 to 10 parts by weight of petroleum resin.

[0036] In addition, another embodiment of the present invention provides a method for constructing goose asphalt concrete comprising the steps of: preparing a goose asphalt concrete composition with excellent crack resistance in a separate plant (S10); leveling a construction surface and removing impurities to form a construction section (S20); applying a primer composition to the upper part of the construction section to form a primer layer (S30); storing and transporting the prepared goose asphalt concrete composition with excellent crack resistance in a mobile storage device, and then laying it on the upper part of the primer layer to form a paving layer (S40); and curing (S50).

[0037] The goose asphalt concrete composition with excellent crack resistance and the method for constructing goose asphalt concrete using the same, according to one embodiment of the present invention, control thermal deformation and thermal stress occurring at high temperatures to secure high cohesion and high bonding strength, thereby providing excellent adhesion, elasticity, and resilience, which has the effect of improving the crack resistance and plastic deformation resistance of the constructed pavement layer. In addition, it has the effect of maintaining excellent long-term durability by preventing aging and spalling from easily occurring over a long period, and exhibiting self-leveling characteristics that allow for leveling without separate compaction during the construction process. Furthermore, it has the effect of improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance.

[0038] Figure 1 below illustrates a goose asphalt concrete paving method using a goose asphalt concrete composition with excellent crack resistance according to one embodiment of the present invention.

[0039] Specifically, a goose asphalt concrete paving method using a goose asphalt concrete composition with excellent crack resistance according to one embodiment of the present invention comprises the steps of: preparing a goose asphalt concrete composition with excellent crack resistance at a separate plant (S10); leveling a construction surface and removing impurities to form a construction section (S20); applying a primer composition to the upper part of the construction section to form a primer layer (S30); storing and transporting the prepared goose asphalt concrete composition with excellent crack resistance in a mobile storage device, and then laying it on the upper part of the primer layer to form a paving layer (S40); and curing (S50).

[0040] In addition, the method for constructing goose asphalt concrete according to the present invention may further include the step of forming a top coating layer on the pavement layer.

[0041] The above-mentioned methods for leveling the construction surface and removing impurities may be performed using methods commonly used in the industry. Specifically, the leveling of the construction surface includes repairing damaged areas on the surface, filling cracks formed on the surface, and removing materials exposed above the surface. Furthermore, the work of removing impurities from the construction surface refers to the removal of impurities present on the surface, such as dust and oil. Additionally, this impurity removal work may include blasting treatment and processes for removing coatings, rust, and other harmful substances.

[0042] The above primer composition is intended to provide corrosion prevention and adhesion functions to the construction area, and a primer composition generally used in the field can be applied uniformly at a rate of 0.2 L / m² or more using an asphalt distributor, a roller, or a spray. At this time, the primer composition is preferably an MMA (Methyl Methacrylate) zinc primer. The MMA zinc primer contains a curing agent (BPO), which enables rapid curing and allows for control of the curing time.

[0043] The above-described mobile stirring and storage device may store and transport the crack-resistant goose asphalt concrete composition at a temperature of 170 to 250 ℃. Additionally, a pavement layer constructed using the crack-resistant goose asphalt concrete composition of the present invention may be formed with a thickness of 0.5 to 5 cm.

[0044] The goose asphalt concrete composition having excellent crack resistance according to one embodiment of the present invention comprises 85 to 90 weight% of aggregate and 10 to 15 weight% of asphalt binder.

[0045] The above aggregate is a construction mineral material that can be combined with other components of a goose asphalt concrete composition having excellent crack resistance according to one embodiment of the present invention to form a single mass, and is chemically stable. Preferred examples of such aggregate may include sand, gravel, basalt, black stone, basalt, other similar materials, or mixtures thereof.

[0046] These aggregates are classified according to size as follows: those with a size of 0.074 mm or more and less than 4.76 mm are called fine aggregates, and those with a size of 4.76 mm or more are called coarse aggregates. The aggregates that can be used in the present invention are generally used in the field, and the amount of aggregate used is not particularly limited; furthermore, the amount of fine aggregate and coarse aggregate mixed in the aggregates can be appropriately adjusted as needed.

[0047] In addition, the above aggregate can be used together with a filler (filler) to fill the voids between the aggregates, thereby further enhancing impermeability. One or more of these fillers may be selected from the group consisting of stone powder, blast furnace slag powder, cellulose fiber, carbon black, fly ash, clay powder, light carbon powder, cement, steelmaking powder, and mixtures thereof.

[0048] It is preferable to use aggregates mixed in the ratios shown in Table 1 below for the aggregate according to the present invention. The aggregate ratios in Table 1 above are aggregates that satisfy the Grade 1 quality standards, and Grade 1 aggregates have a flat stone content of 10% or less and are mainly applied to paved roads with high heavy vehicle traffic.

[0049] aggregate Checker (mm) Remaining amount (%) per checker Coarse aggregate 13 2.5 5 22.5 2.5 21.5 fine aggregate 0.6 11.0 0.3 7.5 0.15 5.5 0.075 6.0 filler 0.075 or less 23.5 total 100

[0051] A goose asphalt concrete composition with excellent crack resistance according to one embodiment of the present invention contains 10 to 15 weight percent of an asphalt binder, thereby controlling thermal deformation and thermal stress occurring at high temperatures to achieve excellent adhesion, and has excellent elasticity and resilience, which improves crack resistance and plastic deformation resistance. In addition, it exhibits self-leveling characteristics without easily causing aging and delamination over a long period of time, and has the effect of improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance.

[0052] Specifically, the asphalt binder contains 55 to 90 weight% of straight asphalt; 1 to 10 weight% of a chlorinated paraffinic plasticizer; and 5 to 40 weight% of a modified admixture.

[0053] The straight asphalt mentioned above is an asphalt raw material produced during the crude oil refining process, and it plays a role in improving the fluidity of the composition as well as increasing resistance to deformation.

[0054] Considering ease of application on roads, the straight asphalt mentioned above may preferably be used with a penetration of 60 to 80 and heated to 180 to 190°C. If the heating temperature is too low, it is difficult to disperse the modifier, which increases the stirring time and makes it difficult to secure uniform physical properties; if it is too high, carbonization of the modifier occurs over time, which affects subsequent processes.

[0055] It is preferable that such straight asphalt be contained in the asphalt binder in a range of 55 to 90 weight percent. If the content of the straight asphalt is too low, there may be problems such as insufficient improvement effect or difficulty in imparting adhesion to the aggregate, and if the content of the straight asphalt is too high, there may be problems such as the asphalt flowing down or crack stability being reduced during road paving.

[0056] The above-mentioned chlorinated paraffinic plasticizer controls the viscosity and softening behavior of the composition to improve workability and constructability, and plays a role in inducing uniform dispersion of the contained components. In addition, it enhances the flexibility of the composition to improve low-temperature brittleness and crack resistance.

[0057] The above-mentioned chlorinated paraffin-based plasticizer is preferably a liquid plasticizer having a specific gravity of 1.1 to 1.3, a chlorine content of 30 to 50 weight%, and a viscosity of 4 to 9 cps (test condition: kinematic viscosity at 60°C). This affects the miscibility with asphalt; if the specific gravity is low, physical properties deteriorate, and if the chlorine content exceeds 50 weight%, the tackiness becomes excessive and acts as a factor for phase separation with the base, while if the chlorine content is less than 30 weight%, the adhesive strength is weak, making it difficult to use in products. Additionally, if the viscosity is less than 4 cps, dispersibility decreases, and if the viscosity exceeds 9 cps, a viscosity difference with the base occurs, leading to a problem of reduced miscibility.

[0058] It is preferable that such chlorinated paraffinic plasticizers be contained in the asphalt binder in a range of 1 to 10 weight percent. If the content of the chlorinated paraffinic plasticizer is too low, there may be problems such as insufficient improvement effect or difficulty in imparting adhesion to the aggregate, and if the content of the chlorinated paraffinic plasticizer is too high, there may be problems such as excessive softening and reduced resistance to deformation at high temperatures.

[0059] The above-mentioned modifying admixture comprises: 1) 100 parts by weight of synthetic rubber mixed with chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber in a weight ratio of 1:0.5 to 2:0.3 to 1.5; 2) 10 to 30 parts by weight of polydopamine; 3) 1 to 10 parts by weight of gentiopicroside; and 4) triethyl citrate It contains 1 to 10 parts by weight; 5) 1 to 10 parts by weight of isovaniloyl catalpol; and 6) 1 to 10 parts by weight of petroleum resin.

[0060] It is preferable that such a modified admixture be contained in the asphalt binder in a range of 5 to 40 weight percent.

[0061] The above 1) synthetic rubber plays a role in controlling compressive strength and viscoelasticity, improving bonding strength, suppressing crack formation, providing adhesion and waterproofing performance, and improving strength characteristics.

[0062] The above synthetic rubber is used in which chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber are mixed in a weight ratio of 1:0.5 to 2:0.3 to 1.5.

[0063] Specifically, the chlorosulfonated polyethylene synthetic rubber has excellent heat resistance at low and high temperatures, thereby suppressing crack resistance and plastic deformation caused by temperature, as well as improving impact strength and adhesion performance with concrete pavement. Considering impact resistance and elasticity, the chlorosulfonated polyethylene synthetic rubber preferably has an elongation of 700% or more, and to ensure heat resistance, it is preferable that the chlorine content be 30 to 50 weight%.

[0064] The above styrene-butadiene-styrene (SBS) synthetic rubber and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber serve to suppress crack formation, provide adhesion and waterproofing performance, and improve strength.

[0065] In addition, the above synthetic rubber may further improve the above effects as well as further improve weather resistance and chemical resistance by additionally mixing fluorosilicone synthetic rubber and polyoctenamer synthetic rubber.

[0066] Specifically, the above synthetic rubber comprises 1 weight ratio of chlorosulfonated polyethylene synthetic rubber; 0.5 to 2 weight ratios of styrene-butadiene-styrene (SBS) synthetic rubber; and 0.3 to 1.5 weight ratios of styrene-ethylene-butylene-styrene (SEBS) synthetic rubber,

[0067] It may further mix 0.01 to 0.1 weight ratio of fluorosilicone synthetic rubber and 0.01 to 0.1 weight ratio of polyoctenamer synthetic rubber.

[0068] The above fluorosilicone synthetic rubber (CAS No. 63148-56-1) serves to reduce the degradation of physical properties at high temperatures and to impart elasticity and resilience. In addition, it assists in oil resistance, chemical resistance, and water resistance, which is beneficial when exposed to moisture and chloride environments, and increases resistance to oxidation and thermal aging, thereby slowing down the progression of cracking, delamination, and hardening over the long term. It is preferable to use a DOW CORNING FS CHEMICALLY INERT FLUID product for the above fluorosilicone synthetic rubber.

[0069] In addition, the above polyoctenamer synthetic rubber (CAS NO. 28730-09-8) not only improves resistance to plastic deformation by increasing hardness and high-temperature strength, but also improves elasticity and viscoelasticity by forming a network to ensure crack resistance and prevents fatigue cracks, low-temperature cracks, aggregate detachment, surface delamination, and potholes.

[0070] Hereinafter, the content of other components constituting the above-mentioned modified admixture is based on 100 parts by weight of the above-mentioned synthetic rubber.

[0071] The above 2) polydopamine improves the adhesion between asphalt and aggregate, densifies the asphalt-aggregate interface to prevent moisture penetration, and suppresses interfacial delamination and the occurrence of microcracks, thereby improving long-term durability.

[0072] The above polydopamine may be used to suppress cracking and spalling phenomena in asphalt concrete, and to increase resistance to impact or fatigue load, freeze-thaw resistance, and wear resistance.

[0073] Specifically, the polydopamine containing the basalt fiber can be manufactured by a method comprising the steps of: dissolving dopamine hydrochloride in Tris-base to prepare a mixture having a pH of 8 to 9 and a concentration of dopamine hydrochloride of 1 to 10 weight%; and mixing 1 to 20 weight parts of basalt fiber with 100 weight parts of the mixture, stirring at room temperature for 20 to 30 hours, then centrifuging to separate the precipitate and washing to produce the polydopamine containing the basalt fiber.

[0074] In addition, the step of manufacturing the polydopamine containing the basalt fiber may involve mixing 1 to 20 parts by weight of basalt fiber, 1 to 10 parts by weight of polyketone, 0.1 to 10 parts by weight of magnolol, and 1 to 5 parts by weight of trimethylpentaphenyl trisiloxane with respect to 100 parts by weight of the mixture, stirring at room temperature for 20 to 30 hours, and then separating the precipitate by centrifugation and washing.

[0075] At this time, the polyketone provides waterproofing, high strength, high toughness, and binding power to the asphalt, while further increasing the bonding between the aggregate and the asphalt to suppress crack formation and prevent aggregate detachment, surface peeling, and potholes. The polyketone may be Hyosung Chemical's POKETONE product.

[0076] The above magnolol ( Magnolol, CAS No. 528-43-8) improves dispersibility and wettability, thereby enabling the formation of a uniform and continuous coating layer on the surface of the basalt fiber. In addition, the trimethylpentaphenyltrisiloxane (CAS No. 28855-11-0) further improves the hydrophobicity and stain resistance of the basalt fiber surface, thereby improving stability against moisture adsorption or environmental exposure.

[0077] It is preferable that such polydopamine be contained in a range of 10 to 30 parts by weight per 100 parts by weight of the synthetic rubber. If the content of the polydopamine is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the polydopamine is too high, there is a problem that the manufacturing process time increases and the viscosity increases, which may lead to a decrease in productivity.

[0078] 3) Gentiopicroside, above CAS No. 20831-76-9) not only changes the moisture behavior in the mixture and improves the uniformity of mixing, but also plays a role in stabilizing the slurry state during construction and controlling viscosity and fluidity.

[0079] It is preferable that such gentiopicroside be contained in a range of 1 to 10 parts by weight per 100 parts by weight of the synthetic rubber. If the content of the gentiopicroside is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the gentiopicroside is too high, there is a problem that the interface may be weakened and durability may be reduced.

[0080] The above 4) triethyl citrate (CAS No. 77-93-0) is It plays a role in improving crack resistance by ensuring fluidity at high temperatures and supporting flexibility at low temperatures.

[0081] It is preferable that such triethyl citrate be contained in a range of 1 to 10 parts by weight per 100 parts by weight of the synthetic rubber. If the content of the triethyl citrate is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the triethyl citrate is too high, there is a problem that high temperature flow resistance, bleeding, and deformation resistance may be reduced.

[0082] The above 5) isovanilloyl catalpol (CAS No. 2415-24-9) finely controls the flowability and workability of asphalt and improves wettability and adhesive behavior at the aggregate-binder interface, thereby reducing delamination.

[0083] It is preferable that such isovaniloylcatapol be contained in a range of 1 to 10 parts by weight per 100 parts by weight of the synthetic rubber. If the content of the isovaniloylcatapol is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the isovaniloylcatapol is too high, there is a problem that phase separation and high-temperature durability may be reduced.

[0084] The above 6) petroleum resin is mixed with asphalt to lower the viscosity of the composition and increase high-temperature properties, while simultaneously providing performance such as adhesion and crack prevention.

[0085] The above petroleum resin is a resin polymerized by various methods using a raw material containing olefins or diolefins, which is a fraction produced as a byproduct of the petroleum refining process or the petrochemical industry. Preferably, aromatic petroleum resins, aliphatic petroleum resins, or mixtures thereof may be used.

[0086] It is preferable that the above petroleum resin be contained in a range of 1 to 10 parts by weight per 100 parts by weight of the above synthetic rubber. If the content of the above petroleum resin is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the above petroleum resin is too high, there is a problem that the stability and strength of the product at high temperatures may significantly decrease or the price may increase, thereby reducing price competitiveness.

[0087] In addition, the modification admixture according to the present invention comprises ethiodized oil (Ethiodized Oil, 100 parts by weight of synthetic rubber CAS No. 8008-53-5) may further contain 1 to 10 parts by weight. The ethiodized oil prevents oxidation and decomposition by light and heat, thereby improving stability and enhancing long-term durability.

[0088] The goose asphalt concrete composition with excellent crack resistance and the method for constructing goose asphalt concrete using the same, according to one embodiment of the present invention, control thermal deformation and thermal stress occurring at high temperatures to secure high cohesion and high bonding strength, thereby providing excellent adhesion, elasticity, and resilience, which has the effect of improving the crack resistance and plastic deformation resistance of the constructed pavement layer. In addition, it has the effect of maintaining excellent long-term durability by preventing aging and spalling from easily occurring over a long period, and exhibiting self-leveling characteristics that allow for leveling without separate compaction during the construction process. Furthermore, it has the effect of improving strength characteristics such as tensile strength and deformation strength, as well as physical properties such as low-temperature properties, durability, and weather resistance.

[0089] Although preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications are possible by those skilled in the art within the scope of the technical concept of the present invention.

[0091] <Preparation Example 1> Preparation of Polydopamine

[0092] Dopamine hydrochloride (Sigma-Aldrich) was dissolved in Tris buffer (Trizma® product, Tris-base / Tris-HCl, Sigma-Aldrich) to prepare a mixture with a dopamine hydrochloride concentration of 2 wt% and a pH of approximately 8. Subsequently, the mixture was stirred at 400 rpm at room temperature for 20 hours, and then centrifuged at 4 ℃ for 30 minutes to separate the supernatant from the precipitate. Afterward, the precipitate was washed with distilled water and freeze-dried to produce polydopamine.

[0094] <Preparation Example 2> Preparation of polydopamine containing basalt fiber

[0095] Dopamine hydrochloride (Sigma-Aldrich) was dissolved in Tris buffer (Trizma® product, Tris-base / Tris-HCl, Sigma-Aldrich) to prepare a mixture with a dopamine hydrochloride concentration of 2 wt% and a pH of approximately 8. Subsequently, 7 parts by weight of basalt fiber (S+ Comtech) were mixed with 100 parts by weight of the mixture and stirred at 400 rpm for 20 hours at room temperature. Afterward, the mixture was centrifuged at 4 ℃ for 30 minutes to separate the supernatant from the precipitate. Subsequently, the precipitate was washed with distilled water and freeze-dried to produce polydopamine containing basalt fiber.

[0097] <Examples and Comparative Examples>

[0098] A goose asphalt concrete composition with excellent crack resistance and a comparative composition were prepared by mixing under the component and content conditions as shown in Table 2 below.

[0099] Classification (Weight%) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Aggregates [mixing ratio in Table 1] 87 87 87 87 87 Asphalt binder 13 13 13 13 13 weight% Straight asphalt 75 75 75 75 75 Chlorinated paraffinic plasticizers 4 4 4 4 4 Modified admixture 21 21 21 21 21 weight part synthetic rubber 100 100 100 100 100 weight ratio chlorosulfonated polyethylene 1 1 1 - - Styrene-butadiene-styrene 0.9 0.9 0.9 1 1 Styrene-ethylene-butylene-styrene 0.6 0.6 0.6 - 0.6 Fluorosilicon [CAS No. 63148-56-1] - 0.05 0.05 - - Polyoctenamer [CAS NO. 28730-09-8] - 0.05 0.05 - - Polydopamine 12 [Manufacturing Example 1] 12 [Manufacturing Example 1] 12 [Manufacturing Example 2] - - Gentiopicroside [CAS No. 20831-76-9] 4 4 4 - - Triethyl citrate [CAS No. 77-93-0] 3 3 3 - - Isovaniloylcatalfol [CAS No. 2415-24-9] 2 2 2 - - Petroleum balance [C5 petroleum balance] 5 5 5 - 5 Ethiodide oil [CAS No. 8008-53-5] - 2 2 - - Chlorinated paraffinic plasticizer: A liquid plasticizer with a specific gravity of approximately 1.2, a chlorine content of approximately 35 wt% or less, and a viscosity of 5 cps (test condition: kinematic viscosity at 60 ℃). Fluorosilicon: Dow-corning FS chemically nitrate fluid product.

[0100] <Test Example 1>

[0101] Using the asphalt binder of the goose asphalt concrete composition with excellent crack resistance according to Examples 1 to 3 and the asphalt binder of the comparative composition according to Comparative Examples 1 and 2, penetration, softening point, elongation, rate of change in mass evaporation, flash point, and performance grade were evaluated and are shown in Table 3 below.

[0102] division Test method Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Penetration (1 / 10 mm) KS M 2252 28 27 30 22 25 Softening point (°C) KS M 2250 102 100 99 91 95 Sinus (10℃, cm) KS M 2254 11 11 13 5 7 Rate of change in evaporative mass (%) KS M ISO 325 0.2 0.3 0.2 0.6 0.4 Flash point (°C) KS M ISO 2592 255 258 257 205 240 Density (15℃) KS M 2201 1.5 1.4 1.5 1.4 1.5 Commonality rating KS F 2389 PG 82-22 PG 82-22 PG 82-22 PG 76-16 PG 76-16

[0104] As can be seen in Table 3 above, the asphalt binder of the goose asphalt concrete composition with excellent crack resistance according to Examples 1 to 3 was found to be superior to the asphalt binder of the comparative composition according to Comparative Examples 1 and 2, not only satisfying the quality standards for goose asphalt binders of the Ministry of Land, Infrastructure and Transport’s asphalt concrete pavement construction guidelines.

[0106] <Test Example>

[0107] After manufacturing an asphalt concrete layer with a thickness of about 50 mm using the asphalt concrete compositions with excellent crack resistance according to Examples 1 to 3 and the comparative compositions according to Comparative Examples 1 and 2, the porosity, tensile adhesive strength, indirect tensile strength, compressive strength, deformation strength, dynamic stability, dynamic shear test (resistance to plastic deformation), deflection test (resistance to low-temperature cracking), and strain at fracture evaluation test (resistance to cracking) were evaluated and are shown in Table 4 below.

[0108] [Test Method]

[0109] 1) Tensile adhesive strength: Using an asphalt tensile adhesive strength tester

[0110] 2) Dynamic stability: Using a wheel tracking tester according to the KS F 2374 method

[0111] 3) Compressive strength: Using an asphalt compressive strength tester

[0112] 4) Dynamic Shear Rheometer (DSR): Used to verify resistance to plastic deformation, the temperature is measured when the G* / sinδ value before aging is 1 kPa and the G* / sinδ value after aging is 2.2 kPa.

[0113] 5) Bending Beam Rheometer (BBR): Used to verify low-temperature cracking resistance. The temperature is measured when the creep stiffness (S) value derived from the BBR test (t = 60 seconds) is 300 MPa or less and the creep rate (m-value) is 0.3 or more.

[0114] 6) Luel flowability (workability and self-leveling properties): After heating the goose asphalt composition to an appropriate working temperature, fill a container with the goose asphalt mixture and prepare a graduated penetrating rod (weight) weighing 995g (or about 1kg). Place the penetrating rod on the surface of the sample by its own weight and measure the time it takes for the penetrating rod to sink to a depth of 5cm into the mixture.

[0115] 7) Penetration test (resistance to plastic deformation): A cubic specimen of the goose asphalt composition with dimensions of 70 mm × 70 mm × 70 mm was prepared, immersed in a 40 ℃ water bath for 1 hour, and then a load of 52.5 kg was applied for 30 minutes.

[0116] 8) Strain at fracture: Measured by the KS F 2395 method.

[0117] division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Porosity (%) 0.4 0.5 0.4 1.2 0.9 Tensile adhesive strength (MPa) 0.85 0.86 0.89 0.58 0.63 Indirect Tensile Strength (ITS) 0.86 0.87 0.88 0.60 0.64 Compressive strength (MPa) 7 days 30.2 31.5 32.6 20.4 24.5 28 days 81 83 84 59 73 Dynamic stability (cycles / mm) 506 519 526 348 425 Dynamic shear test (°C) pre-aging 105 107 109 94 98 After aging 102 104 106 89 90 Deflection test (°C) -17 -17 -19 -8 -11 Ryuel Fluidity (Second) 14 13 11 24 22 Penetration test (mm) ３ ２ ３ ８ ６ Strain at fracture (%, × 10⁻⁶ -3 ) 8.3 8.5 8.4 2.8 5.5

[0119] As can be seen in Table 4 above, it was confirmed that the goose asphalt concrete compositions with excellent resistance to plastic deformation according to Examples 1 to 3 have a low porosity and exhibit excellent tensile adhesive strength, indirect tensile strength, compressive strength, and dynamic stability performance compared to the comparative compositions according to Comparative Examples 1 and 2.

[0120] In addition, as a result of the dynamic shear test, it was confirmed that the temperature at which a specific G* / sinδ value is indicated increased before and after aging, indicating excellent resistance to plastic deformation at high temperatures; and as a result of the deflection beam test, it was confirmed that the limit temperature (BBR temperature) satisfying the creep stiffness (S) and creep rate (m-value) specifications was lowered, indicating excellent resistance to low-temperature cracking. Furthermore, it was confirmed that the penetration test (resistance to plastic deformation) and strain at fracture are excellent, and that the ruel flowability (self-leveling characteristics) is significantly improved.

[0122] As explained above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, all embodiments described above should be understood as illustrative and not restrictive. The scope of the present invention should be interpreted as including all modifications or variations derived from the meaning and scope of the claims set forth below and their equivalents, rather than from the detailed description above.

Claims

Claim 1 It comprises 85 to 90 weight% of aggregate and 10 to 15 weight% of asphalt binder, wherein the asphalt binder comprises 55 to 90 weight% of straight asphalt; 1 to 10 weight% of a chlorinated paraffinic plasticizer; and 5 to 40 weight% of a modifying admixture, wherein the modifying admixture comprises 1) 100 weight parts of synthetic rubber mixed with chlorosulfonated polyethylene synthetic rubber, styrene-butadiene-styrene (SBS) synthetic rubber, and styrene-ethylene-butylene-styrene (SEBS) synthetic rubber in a weight ratio of 1:0.5 to 2:0.3 to 1.5; 2) 10 to 30 weight parts of polydopamine; 3) 1 to 10 weight parts of gentiopicroside; and 4) triethyl citrate A goose asphalt concrete composition with excellent crack resistance, characterized by containing 1 to 10 parts by weight; 5) 1 to 10 parts by weight of isovanilloyl catalpol; and 6) 1 to 10 parts by weight of petroleum resin. Claim 2 A goose asphalt concrete composition having excellent crack resistance according to claim 1, characterized in that the synthetic rubber comprises 1 weight ratio of chlorosulfonated polyethylene synthetic rubber; 0.5 to 2 weight ratios of styrene-butadiene-styrene (SBS) synthetic rubber; 0.3 to 1.5 weight ratios of styrene-ethylene-butylene-styrene (SEBS) synthetic rubber, and further comprises 0.01 to 0.1 weight ratios of fluorosilicone synthetic rubber; and 0.01 to 0.1 weight ratios of polyoctenamer synthetic rubber. Claim 3 A goose asphalt concrete composition having excellent crack resistance according to claim 1, wherein the polydopamine is a polydopamine containing basalt fibers, and the polydopamine containing basalt fibers is prepared by a method comprising the steps of: dissolving dopamine hydrochloride in Tris-base to prepare a mixture having a pH of 8 to 9 and a concentration of dopamine hydrochloride of 1 to 10 weight%; and mixing 1 to 20 weight parts of basalt fibers with 100 weight parts of the mixture, stirring at room temperature for 20 to 30 hours, centrifuging to separate precipitates, and washing to prepare the polydopamine containing basalt fibers. Claim 4 In claim 3, the step of manufacturing the polydopamine containing the basalt fiber comprises mixing 1 to 20 parts by weight of basalt fiber, 1 to 10 parts by weight of polyketone, 0.1 to 10 parts by weight of magnolol, and 1 to 5 parts by weight of trimethylpentaphenyltrisiloxane with respect to 100 parts by weight of the mixture, stirring at room temperature for 20 to 30 hours, and then centrifuging to separate the precipitate and washing, thereby giving a goose asphalt concrete composition with excellent crack resistance. Claim 5 A goose asphalt concrete composition with excellent crack resistance according to claim 1, characterized in that the modifying admixture further contains 1 to 10 parts by weight of ethiodized oil per 100 parts by weight of synthetic rubber. Claim 6 A method for constructing goose asphalt concrete using a goose asphalt concrete composition having excellent crack resistance according to any one of claims 1 to 5, comprising the steps of: preparing the goose asphalt concrete composition having excellent crack resistance at a separate plant (S10); leveling the construction surface and removing impurities to form a construction section (S20); applying a primer composition to the upper part of the construction section to form a primer layer (S30); storing and transporting the prepared goose asphalt concrete composition having excellent crack resistance in a mobile storage device, and then laying it on the upper part of the primer layer to form a paving layer (S40); and curing (S50).

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