KR102603084B1 - Binder for repairing of various damages on the road and manufacturing method threreof - Google Patents

Abstract

The present invention relates to a binder mixture containing a thermoplastic modified repair binder composition and aggregate capable of repairing various types of damage caused to roads caused by fatigue cracks, and is applied to asphalt 71 to 90 weight with a penetration degree of 60 to 80. % by weight, 5 to 15% by weight of softener, 3 to 10% by weight of modifier, 0.5 to 3.0% by weight of heat-resistant stabilizer, and 0.1 to 1.0% by weight of bonding promoting antioxidant, so that it has stability without breaking even at low temperatures, and has flexibility and elastic recovery rate. It is excellent in response to crack resistance and resilience, and is applied to low-viscosity, medium-temperature mastic (MASTIC) technology, which is economical and eco-friendly, and has the effect of quickly and easily repairing damaged areas.

Description

Binder for repairing of various damages on the road and manufacturing method threreof}

The present invention relates to a thermoplastic modified repair binder composition that can repair various types of damage caused to roads by fatigue cracks. More specifically, it has excellent stability, flexibility, and elastic recovery rate without breaking even at low temperatures of -20°C. This relates to a composition that not only has excellent crack resistance and resilience, but is also economical and eco-friendly, and can quickly and easily repair damaged areas based on specialized low-viscosity, medium-temperature mastic (MASTIC) technology.

In general, after paving, roads begin to deteriorate due to external factors such as repeated loads from vehicles or environmental factors such as moisture and climate, which leads to damage and makes it difficult to maintain durability at the initial stage of construction. In this way, as the road repeats expansion and contraction due to various factors and temperature changes, cracks occur in the pavement, and the shape and size of the cracks change in various forms.

Typical damaged areas include the side ditches in contact with concrete, around manholes, mesh-type so-called turtle-back cracks, wide or narrow horizontal/vertical cracks, portholes, expansion joints, excavation repair areas, etc. It is occurring in the form In particular, in the domestic reality where all lanes cannot be paved at the same time and each lane is paved one at a time, cold joint cracks are occurring across the conduction road, and cracks and damage caused by rainwater infiltration through this are gradually increasing. The reality is that pavement maintenance costs are gradually increasing as damaged parts as described above are repeatedly re-repaired.

Damaged roads must be repaired using materials appropriate for the type of damage. However, in Korea, no special response has been found other than limited and limited methods such as using pothole repair materials for deep and deep depressions, crack sealing for cracks less than 2 cm, and covering localized damaged areas with sofa repair. there is.

For example, general cracks in the horizontal/vertical direction can be repaired with crack sealing, but in reality, it is very difficult to repair all the branch cracks (fine cracks and microcracks) that extend like branches from the center of the crack as shown in Figure 1. Therefore, as water penetrates into the branch cracks left unattended and penetrates into the repaired part, re-cracks occur in the repaired part and the vicious cycle of damage is repeated. Therefore, a material is needed that can repair not only the central crack area in the horizontal/vertical directions, but also the surrounding fine cracks and fine cracks at once.

In particular, the damage is getting worse because the depth of damage is thin and low or there is no suitable material to properly repair the various types of damage specified above, so they are practically left alone.

In addition, in the case of Figure 2(b), where a surface damaged by fatigue cracks (Figure 2(a)) is repaired through sofa repair, a construction joint occurs between the repaired surface and the existing surface after construction, and water infiltrates through the gap. As the material moves, the gap becomes larger and a crack occurs.

In addition, expansion joints of underpasses and bridges, which are one of the representative damaged areas, are used to accommodate water expansion by leaving an appropriate gap between the structures to prevent cracks and damage and maintain the safety of the pavement. The material properties must not deteriorate in durability even after long-term exposure to ultraviolet rays and moisture, and must be able to maintain performance from water expansion due to seasonal changes and loads and impacts from vehicle driving. In addition, it must be a product that can be immediately repaired and reinforced even if it is opened to traffic immediately after construction and a partial defect occurs.

Gap mastic sealant, a surface repair material to respond to this, is a high-temperature modified asphalt binder using polymers and is known to have excellent high-temperature cohesion, resilience, and flexibility. However, due to its high viscosity, the melting heating and laying temperature is high at around 205℃. There is a problem that large amounts of greenhouse gases may be generated.

Prior patent documents related to repair materials to solve these problems are as follows. First, Patent No. 599586 discloses a crack repair material manufactured by polymerizing a monomer with a double bond in the molecule using a silane compound as a solvent, and Patent Publication No. 2002-0078688 and Patent No. 0388810 disclose an asphalt sealant. It relates to composition. However, these products are not free from deterioration and damage to pavements caused by strong ultraviolet rays and long rainy seasons in the summer.

Registered Patent No. 1395523 proposes a composition of modified asphalt (PG76-22) mixed with TPE (thermoplastic elastomer), UV stabilizer, and adhesion promoter. Although durability of oxidation by UV rays can be improved, viscosity at 170°C It is quite high at 20,000cPS, so a large amount of harmful gases may be generated due to maintaining a high melting temperature during construction, and there is a problem that may cause civil complaints due to the unique smell of the rubber powder (waste tire Crumb Rubber) it contains.

In order to solve the problems of these prior patent documents, the modified asphalt-based sealant composition of Patent No. 2005941 is made by adding graphene oxide instead of a UV stabilizer to the existing patented composition, and some physical properties such as softening point and elongation are reduced. There has been a slight increase and improvement, but the odor problem caused by waste tires (containing rubber powder) still persists, and the viscosity is not specified, so there is a problem that standards such as melting and workability cannot be established when applied in the field. .

Lastly, Publication Patent No. 2020-0042578 combines styrene isoprene stylene (SIS) and petroleum resin with goose asphalt, and has the effect of increasing the strength of the mixture by improving waterproofing, bonding power, and durability, but Goose asphalt has the effect of increasing the strength of the mixture. There are still limitations in solving the hard characteristics and high viscosity of asphalt using only SIS and petroleum resin.

Due to Goose asphalt's characteristic high viscosity, heating, maturation, and laying temperature are performed at around 250℃, so problems such as unnecessary energy consumption, increased construction time, and greenhouse gas emissions due to increased melting time cannot be overcome, so medium-temperature construction is required. cannot achieve its purpose. In addition, when laying goose asphalt, it cannot be applied because the bridge steel deck is deformed due to high heat, and due to difficulties in temperature management such as cooling after construction, subsequent processes cannot be carried out immediately, which unnecessarily prolongs the construction period. In addition, in the case of Goose asphalt, the price of the asphalt itself is expensive, and the problem of the unit price rising further is that it is an imported product.

Registered Patent No. 599586 Public Patent No. 2002-0078688 Registered Patent No. 0388810 Registered Patent No. 1395523 Registered Patent No. 2005941 Public Patent No. 2020-0042578

Accordingly, the present invention relates to a binder and a method of manufacturing the binder that can repair various types of road damage caused by fatigue cracks, and can improve and overcome problems that conventional prior patent documents have not been able to solve.

The thermoplastic modified repair binder according to the present invention has a high softening point, which ensures high temperature stability, allows construction in all seasons regardless of the external temperature such as summer/winter, and has excellent low-temperature stability, flexibility, and recovery, providing excellent crack resistance. Responsiveness is excellent.

In addition, based on MASTIC technology with a construction temperature of 150~160℃, we aim to provide a thermoplastic modified repair binder that is economical and eco-friendly by minimizing CO ₂ emissions and can repair various damaged areas quickly and easily.

Therefore, the present invention can provide a new binder and binder mixture that can effectively repair crack patterns that were only possible with existing sofa repair methods.

The thermoplastic modified repair binder according to an embodiment of the present invention contains 71 to 90% by weight of asphalt with a penetration degree of 60 to 80, 5 to 15% by weight of softener, 3 to 10% by weight of modifier, and 0.5 to 3.0% by weight of heat-resistant stabilizer. % and 0.1 to 1.0 wt% of bond-promoting antioxidants, and can repair various types of damaged areas on the road.

Another embodiment of the present invention includes a thermoplastic modified repair binder mixture in which the thermoplastic modified repair binder and aggregate are mixed.

At this time, the aggregate is preferably silica sand or filler, and may include 15 to 35% by weight of the thermoplastic modified repair binder and 65 to 85% by weight of the aggregate.

This thermoplastic modified repair binder mixture can form a waterproof layer at the same time as crack repair, can form leveling by its own weight without separate compaction after installation, and can be constructed as a replacement for goose asphalt or expansion joints.

Another embodiment of the present invention includes a method of manufacturing a thermoplastic modified repair binder, wherein the first mixture of 71 to 90% by weight of asphalt with a penetration of 60 to 80 and 5 to 15% by weight of softener is mixed to 170 to 190%. A heating step of heating to a temperature of ℃; A first dispersion step of stirring a second mixture in which 3 to 10% by weight of a modifier is mixed with the heated first mixture; A crosslinking step of crosslinking the second mixture in which the first dispersion step was performed by adding 0.1% to 1% of a bond-promoting antioxidant; And a second dispersion step of dispersing by adding 0.5 to 3% by weight of a heat-resistant stabilizer.

In addition, the method for producing a thermoplastic modified repair binder mixture includes a heating step of heating a first mixture of 71 to 90% by weight of asphalt with a penetration degree of 60 to 80 and 5 to 15% by weight of a softener to a temperature of 170 to 190 ° C. ; A first dispersion step of stirring a second mixture in which 3 to 10% by weight of a modifier is mixed with the heated first mixture; A crosslinking step of crosslinking the second mixture in which the first dispersion step was performed by adding 0.1 to 1% by weight of a bond-promoting antioxidant; A second dispersion step of adding and dispersing 0.5 to 3% by weight of a heat-resistant stabilizer; and further mixing the aggregate.

At this time, the aggregate includes silica sand or filler, and the thermoplastic modified repair binder mixture preferably includes 15 to 35% by weight of the thermoplastic modified repair binder and 65 to 85% by weight of the aggregate.

The thermoplastic modified repair binder of the present invention is used to repair various types of damage, including thin dents that could not be repaired with existing repair materials, such as gutter areas, around manholes, mesh-type so-called turtle back cracks, wide or narrow horizontal/vertical cracks, portholes, and new construction. It has the function of an all-weather repair material that can be applied to all fatigue damage areas such as expansion joints and excavation repair parts, and its low-viscosity, medium-temperature technology (150 to 160℃) is 50 to 60 percent cheaper than existing products from developed countries. By constructing at a low temperature, energy use and greenhouse gas emissions can be reduced, resulting in both economical and environmentally friendly effects.

In addition, the binder in an airtight, finely cross-linked and tightly woven molecular state has low temperature sensitivity and high heat resistance and durability. Appropriate elasticity and ductility absorb and relieve stress caused by vehicle loads, providing excellent response to plastic deformation and excellent elastic recovery and durability. Low-temperature flexibility provides a stable effect in response to the behavior of continuous contraction and expansion.

In addition, the appropriate strength and softness have the advantage of being able to prevent the road from being damaged by moisture by adhering smoothly and strongly to the existing surface and forming a waterproof layer with a 0% porosity to completely block water.

Figure 1 shows unrepaired photos of branch cracks and minor cracks around damaged roads where cracks occurred.
Figure 2 is a photograph of the surface where fatigue cracks occurred before (a) and after (b) sofa repair.
Figure 3(a) is a photograph of a compressive strength test using a binder mixture according to the present invention, Figure 3(b) is a photograph of the uneven surface of a specimen used in a bending test, and Figure 3(c) is a photograph of a compressive strength test using a binder mixture according to the present invention. This is a photo of the adhesion strength test of the binder composition.
Figure 4(a) is a bending test result of the repair binder composition of the present invention, and Figure 4(b) is a photograph of a bending test using the repair binder composition of the present invention.
Figures 5(a) to 5(c) are photographs of various types of crack shapes and representative damaged areas applicable to the present invention, and (a) is a photograph of a combination of general straight clusters and branch cracks (fine cracks). , (b) is a photograph of turtle-back cracks and pothole damage, and (c) is a photograph of damage to the asphalt pavement surface and concrete surface, and damage to the gutter area.
Figure 6 is a photograph showing the process of constructing a repair binder mixture according to an embodiment of the present invention, and Figure 7 shows a repair binder mixture according to an embodiment of the present invention being applied to repair branch cracks (microcracks) at once. These are photos showing the process.

Before explaining the present invention in detail through preferred embodiments below, terms and words used in the present specification and claims should not be construed as limited to their usual or dictionary meanings, but rather have meanings consistent with the technical idea of the present invention. It should be interpreted as a concept.

The thermoplastic modified repair binder according to an embodiment of the present invention for achieving the object of the present invention includes 71 to 90% by weight of asphalt with a penetration degree of 60 to 80, 5 to 15% by weight of softener, and 3 to 10% by weight of modifier. , 0.5 to 3.0% by weight of a heat-resistant stabilizer and 0.1 to 1.0% by weight of a bond-promoting antioxidant, and another embodiment of the thermoplastic modified repair binder mixture is a mixture of the thermoplastic modified repair binder and aggregate such as silica sand or filler.

On the other hand, this thermoplastic modified repair binder includes heating a first mixture of 71 to 90% by weight of asphalt with a penetration degree of 60 to 80 and 5 to 15% by weight of a softener to a temperature range of about 170 to 190 ℃; A first dispersion step of preparing a second mixture by adding 3 to 10% by weight of a modifier to the heated first mixture, and then uniformly dispersing the modifier; A crosslinking step of crosslinking the second mixture that has undergone the first dispersion step by adding 0.1 to 1% by weight of a bond-promoting antioxidant; And a second dispersion step of uniformly dispersing by adding 0.5 to 3% by weight of a heat-resistant stabilizer.

The thermoplastic modified repair binder produced by this method has a softening point of 95°C or higher and a penetration degree (@ 25°C, 100g, 5 seconds) of 60 to 80 mm. In addition, it is more than 1000 kpa (@ -), which is superior to the bending test standard for polymer-modified drainable asphalt (bending force over 400 kpa and bending stiffness under 100 Mpa, @-20℃) in cold regions of Japan (areas where aggregate scattering resistance at low temperatures is significantly required). It has a bending force of 20℃) and a bending stiffness of less than 50Mpa (@ -20℃, unbreakable). In addition, the elongation is more than 70cm (@ 5℃), the elastic recovery is more than 80% (@ 25℃), and the viscosity at 150℃ is less than 1000cps, so medium temperature construction is possible.

A thermoplastic modified repair binder mixture can be prepared by mixing 15 to 35 wt% of the thermoplastic modified repair binder prepared in this way and 65 to 85 wt% of aggregate, and the thermoplastic modified repair binder mixture prepared in this way may be subjected to a separate compaction process after construction. Leveling can be achieved by its own weight (refer to the results of the Ruehl fluidity test described later), and it can be applied to a repair method in which crack repair and formation of a waterproof layer (refer to the results of the porosity test described later) are performed simultaneously.

Hereinafter, the technical composition of the thermoplastic modified repair binder and the thermoplastic modified repair binder mixture for realizing the purpose of the present invention will be described in more detail.

First, 71 to 90% by weight of asphalt with a penetration of 60 to 80mm and 5 to 15% by weight of softener are mixed in a heated tank, heated to a temperature range of about 170 to 190 ℃ and maintained for a predetermined time, and then 3 to 10 weight of modifier is added. Add % and stir to melt and disperse for about 2 to 3 hours. Afterwards, 0.1 to 1.0 wt% of a bond-promoting antioxidant is added and cross-linked for about 1 hour. Finally, 0.5 to 3.0 wt% of heat-resistant stabilizer is added and evenly dispersed to complete the manufacturing process.

The reason why the mixing temperature in the heated tank is maintained in the temperature range of about 170 to 190 ℃ is that when dissolved for a long time at a high temperature exceeding 190 ℃, the physical properties of the reforming material and the input raw materials are altered or destroyed. This is because the performance of the raw materials may be lost, and if performed at a temperature below 170°C, the raw materials may not be sufficiently melted, which may increase manufacturing time, as well as the presence of some remaining unmelted crystals. This is because the subsequent first and second dispersion processes may not be performed smoothly and the final physical properties of the binder composition may not be uniform, which may result in problems.

Asphalt with a penetration degree of 60 - 80 is the basic material of the binder composition according to the present invention, and improves adhesion and water resistance and improves watertightness to provide resistance to prevent absorption and penetration of water (moisture). Demonstrate. One type selected from the group consisting of Straight Asphalt, Blown Asphalt, Trinidad Asphalt, and Gilsonite may be used, or two or more types may be mixed.

In addition, the asphalt is preferably used in the range of about 71 to 90% by weight. If the asphalt content is less than 71% by weight, it is difficult to secure the physical properties described above due to the small content, and if it exceeds 90% by weight, it is difficult to secure the physical properties described above. The binder composition is prone to cracking or breaking, which causes problems in the elasticity and ductility of the product at low temperatures.

The softener improves the low-temperature performance of the composition, improves miscibility and processability between composition components, and improves dispersibility, thereby contributing to smooth melting. It is preferable to use a mixture of two or more types from the group consisting of petroleum oil, coal oil, vegetable oil, aromatic oil, naphthenic oil, and paraffin oil. This softener is preferably used in the range of about 5 to 15% by weight. However, if it is included in the binder composition at less than 5% by weight, the dispersibility decreases and the viscosity of the composition increases, making it a solvent for low-viscosity neutralization and subsequent crosslinking reaction. cannot fully exercise its function. Additionally, flexibility and low-temperature performance may also be reduced, which may cause problems that adversely affect the physical properties of the final binder.

On the other hand, when used in excess of 15% by weight, dispersion and miscibility are improved and processability becomes excellent, but the viscosity is excessively reduced, which may cause problems such as low high-temperature performance and reduced physical properties such as strength and heat resistance stability.

The modifier provides tension, tear, viscoelasticity, etc. to the binder composition according to the present invention, thereby improving stability against fatigue cracking, low-temperature cracking, deformation, etc. Radial type SBS(Styrene-Butadiene-Styrene), Linear type SBS(Styrene-Butadiene-Styrene), SBR(Styrene-Butadiene-Rubber), SIS(Styrene-Isoprene-Styrene), SEBS(Styrene-Ethylene-Butadiene-Styrene) etc. may be used, and it is preferably included in the range of 3 to 10% by weight. If it is less than 3% by weight, the effect is insignificant and the desired physical properties such as elasticity, toughness, and durability cannot be obtained, and the resistance to external influences such as load or pressure transmitted from the surface layer decreases, leading to the problem of easy cracking. Occurs. In addition, if it exceeds 10% by weight, the elasticity increases significantly, but the soft and soft properties deteriorate, making it difficult to secure elongation performance. The viscosity increases, which increases the manufacturing process time, and increases the manufacturing cost, creating problems in securing economic feasibility. do.

The bond-promoting antioxidant is a cross-linking material obtained through an exothermic reaction after mixing substances such as sulfur, phenol, phosphoric acid, and sulfonic acid. Specifically, it contains 57.6% by weight of sulfur, 2.7% by weight of phenol, 6.6% by weight of phosphoric acid, and 33.1% by weight of sulfonic acid. It is a cross-linked material reacted by stirring a mixture of %.

To describe the manufacturing process of the bond-promoting antioxidant, first, sulfur and sulfonic acid are added to a ribbon mixer in the weight ratio described above and then mixed. At this time, a temperature sensor and a heating device are installed inside the ribbon mixer, and a screw stirrer that can rotate in the forward and reverse directions performs the function of dispersing the mixture evenly without clumping.

First, after adding sulfur and sulfonic acid, the speed is rotated at about 1200 RPM. When the temperature of the mixture inside the tank is maintained above about 20 degrees, phosphoric acid and phenol are added in order and the speed is increased to over 1700 rpm. After mixing for about 30 minutes, the energy of the materials slowly releases heat in stages, and an exothermic reaction begins, causing the temperature to rise and a chemical reaction to occur. Afterwards, manufacturing is completed when the temperature of the mixture reaches between 40-50 degrees.

In this way, bond-promoting antioxidants are used to prevent deterioration of the composition and material separation by increasing the bond between asphalt and the modified material, and to prevent aging and oxidation. The types are inorganic acid and organic acid containing a carboxyl group (-COOH). A variety of acids such as Acid can be used.

The bonding promoting antioxidant can be included in the thermoplastic modified repair binder in the range of 0.1 to 1.0% by weight. If it is less than 0.1% by weight, the content is too small to be effective as a link for promoting reaction and bonding, and 1.0% by weight. If it is exceeded, the problem of deterioration of product performance may occur due to diversification of constituent materials, including asphalt, during crosslinking.

The heat-resistant stabilizer stabilizes the physical properties of the product so that they remain unchanged at high temperatures, improves heat resistance, lowers viscosity, increases stable coating and dispersibility in aggregate, and lowers the production temperature during construction so that it can be effectively applied to medium-temperature technology. do. It can be used alone or in a mixture of two or more of the group consisting of paraffin wax, polyethylene wax, polypropylene wax, and EBS wax.

The heat-resistant stabilizer can be used in the range of 0.5 to 3.0% by weight. If the amount used is less than 0.5% by weight, the application amount is small and high-temperature stability and heat resistance performance are reduced, so it cannot be applied to medium-temperature construction. If it exceeds 3.0% by weight, a film may form on the surface. Problems such as deterioration of adhesion and adhesion performance may occur due to phenomena such as surface cracking or surface cracking.

The thermoplastic modified repair binder composition manufactured with the composition and method described above has a softening point of 95°C or higher, a penetration degree (@ 25°C, 100g, 5 seconds) of 60 to 80 mm, and a bending amount determined through a bending test. and bending stiffness are respectively more than 1000kpa (@ -20℃) and less than 50Mpa (@ -20℃, unbreakable). In addition, the elongation is more than 70cm (@ 5℃), the elastic recovery is more than 80% (@ 25℃), and the viscosity at 150℃ is in the range of 1000cps or less, making medium temperature construction possible.

If the softening point of the binder is 95°C or lower, high temperature stability cannot be secured and the road pavement may be deformed due to high temperatures in summer. If the penetration value is 60mm or lower, low temperature brittleness increases and may easily break. You can. On the other hand, if the degree of penetration exceeds 80mm, the strength and durability may decrease and it may be pushed or dented by the load and pressure of the vehicle after construction, resulting in loss of function.

In addition, it has a softness similar to the penetration degree (60-80) of the AP-5 binder commonly used in packaging, so it is stable without any discomfort in the movement due to mutual bonding and movement with the existing packaging body.

In addition, in the case of new roads, the existing Ministry of Land, Transport and Maritime Affairs standard for drainage modified asphalt (15℃, 5cm/min) is 50cm or more, and the road sealing material standard (expansion joint repair material) (@ 25℃, 5cm/min) is 40cm or more. Instead, the test was conducted at a lower temperature of 5°C to ensure flexibility at low temperatures in winter.

Viscosity is an important parameter that allows the thermoplastic modified repair binder composition according to the present invention to be applied at medium temperatures, and its range is preferably 1000 cPs or less at 150°C. This is because the mixture of the thermoplastic modified repair binder with the aggregate is water-cooled, so if the viscosity is too high, it takes a long time during the on-site melting and production process, and the flowability may be low, making it difficult to discharge from the equipment, and heating to a high temperature for laying is necessary. If this is done, problems such as unnecessary energy consumption and large amounts of harmful gases may be emitted.

In the case of elastic recovery, it is to disperse the force to prevent cracks from occurring due to the load and pressure of the vehicle and return to the original nature and form to maintain a stable state. It must have an average recovery value of at least 80% or more. It is believed that stability will be secured.

The characteristic of not cracking or breaking even at a low temperature of -20℃ through a bending test, and the bending force and bending stiffness, which are indicators of fatigue resistance, measured through a low temperature bending test, mean stability. In addition, it is desirable to establish a management system for material separation, deterioration, and storage through storage stability tests.

The thermoplastic modified repair binder according to the present invention as described above can be mixed with aggregate to prepare a thermoplastic modified repair binder mixture, which may include 15 to 35% by weight of the thermoplastic modified repair binder and 65 to 85% by weight of aggregate, The aggregate used may include silica sand or filler.

If the content of the thermoplastic modified repair binder contained in the thermoplastic modified repair binder mixture is less than 15 wt%, the content is small, so a complete coating of the aggregate is not achieved, and the adhesion between aggregates is reduced, which may cause problems with bonding strength. In addition, the flowability and fluidity of the mixture are poor, so the mixture is not properly discharged from the equipment, so the temperature must be raised to a high temperature to forcibly discharge the product, which can lead to unnecessary energy consumption and harmful gases. This is an eco-friendly, medium-temperature packaging that minimizes carbon emissions. Not only will it not be possible to meet the purpose of the invention, but there may be great difficulties in the construction itself.

On the other hand, if the content is over 35% by weight, the aggregate may sink and the binder may float during construction, which may cause problems such as loss of slip resistance, loss of strength due to the absence of surface aggregate, and plastic deformation, and the unit price of the product may increase. As prices rise, price competitiveness decreases.

Compressive strength and bending bending tests were conducted on the repair binder mixture according to one embodiment of the present invention. The compressive strength refers to the load value applied to the test specimen (binder mixture) until the specimen cracks. As can be seen in Figure 3(a), in the case of the repair binder mixture according to an embodiment of the present invention, it was not broken or destroyed during the compressive strength test process, but only the shape of the test specimen was deformed, so accurate measurement values could not be obtained. In addition, as can be seen in Figure 3(b), the specimens of the mixture were also not manufactured consistently, making it difficult to trust the measured values. Therefore, in the following, the physical properties of the binder composition itself, not the binder mixture, were measured.

The physical properties of the thermoplastic modified repair binder were tested for softening point, penetration, viscosity, elongation, storage stability, elastic recovery rate, adhesion strength, and bending. In the case of the repair binder mixture, the binder and aggregate were mixed at 150℃ for medium temperature construction. Thus, a Ruehl fluidity and porosity test was performed.

Hereinafter, the present invention will be described in more detail through specific examples and comparative examples.

The thermoplastic modified repair binder composition of Example 1 was manufactured through the manufacturing process described above using the composition ingredients and composition ratios listed in Table 1 below. The bonding promoting antioxidant is a cross-linking material obtained through an exothermic reaction after mixing 57.6% by weight of sulfur, 2.7% by weight of phenol, 6.6% by weight of phosphoric acid, and 33.1% by weight of sulfonic acid. First, sulfur and sulfonic acid are added and the rotation speed is approximately 1200 RPM. The temperature of the mixture inside the tank is maintained above about 20 degrees, and then phosphoric acid and phenol are added in order and the speed is increased to over 1700 rpm. After mixing for about 30 minutes, an exothermic reaction begins as the energy of the materials slowly releases heat in stages, causing the temperature to rise and a chemical reaction to occur. Afterwards, the reaction ends when the temperature of the mixture reaches between 40-50 degrees. .

Raw material name Mixing ratio (%) note Asphalt (straight asphalt) 85.0 AP5 (Invasion Degree 63) Emollients (mixture of paraffinic and aromatic oils) 8.0 Mixing ratio (weight ratio)
(Paraffinic oil:aromatic oil = 8:2) Modified material (Liner Type SBS) 5.7 - Binding-promoting antioxidant 0.3 Acid-based Heat-resistant stabilizer (polyethylene wax) 1.0 -

The test results for the thermoplastic modified repair binder composition of Example 1 prepared in this way are summarized in Table 2 below. The binder composition of Example 1 showed stable results in all test items except adhesion strength.

Test Items Test conditions and units Example 1 Test Methods Yeonhwa branch 5℃ rise/min/℃ 100 KS M 2250 Invasion 25℃, 100g, 5sec/mm 76 KS M 2252 viscosity 150℃/cps 900 KS F 2392 believer 5℃, 5cm/min/cm 80 KS M 2254 Bending bending test -20℃, speed 100mm/min Unbreakable, break KS F 2491 Storage stability 163±5℃ 7 days (168 hours) No separation (change) ASTM D36 Elastic recovery rate 25℃±0.5/% 90 D6084/D6084M Adhesion strength Curing at 20℃ (±2) for 7 days not measurable KS F 4936

In particular, the bending test results of the binder are summarized separately in Figure 4(a) and Table 3, and Figure 4(b) shows a photo of the bending test. The average bending work at -20℃ is 1903Kpa, and the bending stiffness value is 18.84Mpa, which is the bending work (above 400kpa/-20℃) and bending stiffness (below 100Mpa/-20℃) of polymer-modified drainable asphalt required in cold regions of Japan. It showed a numerical value that far exceeded the standard of ℃) and showed excellent resistance to fatigue cracking at low temperatures.

The elongation value at 5℃ is 80cm and the elastic recovery rate is 90%, which confirms that it has an appropriate combination of ductility and elasticity, which means that the resilience effect in response to plastic deformation and behavior will be excellent.

However, adhesion strength measures the maximum tensile force (load) required to destroy and damage the interface between the base material and the test specimen by applying a tensile force in the vertical direction to the test specimen. As a result of the adhesion strength test, the interface between the base surface and the test specimen was maintained without detachment. The stretching phenomenon was observed as shown in Figure 3 (c), making it difficult to accurately measure the adhesion strength.

Specimen size maximum load bending strength Theoretical maximum stress (σ) Maximum bending strain (ε) maximum displacement Bending work
(w)>400 Bending stiffness(s)<100 mm N MPa(N/ _mm2 ) mm kPa MPa 19.8×20 457.60 6.93 6.86 0.33 17.50 2252.25 21.13 20×20 297.70 4.47 4.47 0.31 16.50 1381.51 14.44 20×20.1 441.90 6.56 6.63 0.31 16.70 2075.55 20.96 average 399.07 5.99 5.99 0.32 16.90 1903.10 18.84

Below, comparisons are made with Example 1 through comparative examples. Comparative Example 1 used the same mixing ratio as Example 1, but used only aromatic oil as a softener. In addition, Comparative Example 2 had the same composition as Example 1, but was prepared only in that it did not contain an antioxidant. The specific composition is shown in Table 4 below.

Raw material name Comparative Example 1 Comparative Example 2 asphalt 85.0% 85.0% softener 8.0% aromatic type) 8.0% paraffin type + aromatic type) modified material 5.7% 5.7% Combined anti-oxidant 0.3% 0% heat stabilizer 1.0% 1.0%

As confirmed in Table 5 below, Comparative Example 1, in which aromatic oil was used alone as a softener, had a problem of increased viscosity, and fracture results due to low low-temperature stability were confirmed through a bending test.

In the case of Comparative Example 2, which did not contain a bond-promoting antioxidant, changes in upper and lower physical properties were observed in the storage stability test, and a problem of upper and lower layer separation was confirmed.

Test Items Test conditions and units Comparative Example 1 Comparative example 2 Yeonhwa branch 5℃ rise/min/℃ 98 98 Invasion 25℃, 100g, 5sec/mm 52 80 viscosity 150℃/cps 1210 870 believer 5℃, 5cm/min/cm 51 85 Bending bending test -20℃, speed 100mm/min broken, broken Unbreakable, break x Storage stability 163±5℃ 48 hours No separation (change) Phase separation occurs Elastic recovery rate 25℃±0.5/% 81 91 Adhesion strength Curing at 20℃ (±2) for 7 days not measurable KS F 4936

Next, a thermoplastic modified repair binder mixture was prepared by mixing the thermoplastic modified repair binder composition of Example 1 with silica sand, and while changing the mixing ratio of the binder composition and silica sand, Comparative Example 2-1, Comparative Example 2-5, and Example 2-2, 2-3, and 2-4 were prepared, and the evaluation results are summarized in Table 6 below.

Raw material
Comparative Example 2-1 Example 2-2 Example 2-3 Example 2-4 Comparative Example 2-5 Silica sand content
90% 85% 80% 70% 60% Binder content
10% 15% 20% 30% 40% 150℃ aggregate coating X ○ ○ ○ ● Ruel Liquidity
(seconds/20 or less) 23 15 12 7 3 Porosity test
1.6% 0.7% 0.1% 0.0% 0.0%

(X: Coating not possible, ○: Appropriate, ●: Excessive by visual confirmation)

First, the Ruehl fluidity test (quality standard for mastic asphalt mixtures) is a measure of the degree of flow during construction and is mainly used to determine constructability, and the test was conducted at 150 ℃, the temperature of laying and construction.

The repair binder mixture of Comparative Example 2-1 had a significantly low binder content, so aggregate coating was not achieved, and the Ruehl fluidity test results were outside the standard (20 or less), showing a problem of poor flow during construction. Meanwhile, in the case of Comparative Example 2-5, the Ruel fluidity was less than 20, but the binder content was used in excess, so aggregate coating and fluidity were secured. However, during construction, a layer separation phenomenon occurred in which the binder floats up and the aggregate sinks, and an unnecessary excess amount was used. The use of binders may result in an increase in construction costs.

On the other hand, in the case of Examples 2-2, 2-3, and 2-4 of the present invention, the results showed a smooth aggregate coating and satisfied the Ruehl fluidity test standard, and it was found that constructability was secured due to appropriate flowability. You can. Due to this appropriate flowability, the thermoplastic modified repair binder mixture according to the present invention can be leveled by its own weight without a separate compaction process after construction. Therefore, it can be seen that within the scope of Examples 2-2 to 2-4, it is desirable to appropriately adjust the aggregate and binder contents according to the type and depth of damage in the field.

In addition, as confirmed in the porosity measurement results for the thermoplastic modified repair binder mixture prepared in this way, it can be seen that not only the existing crack repair work but also the waterproofing work effect exists at the same time. Therefore, due to its high constructability and low porosity, it can be applied to a repair method in which crack repair construction and waterproof layer formation construction are performed simultaneously.

The thermoplastic modified repair binder mixture of the present invention according to Example 2 can be applied to various types of damaged areas on the road, and various types of cracks and cracks shown in Figures 5 (a), (b) and (c). Can be installed on damaged areas.

As shown in Figure 5(a), general cracks in the longitudinal and transverse directions, as well as areas where branch cracks and fine cracks that were neglected because crack sealing alone was impossible, can be easily repaired at once. In addition, as shown in Figure 5(b), even cracks around thin and low areas such as turtle shell cracks and deep depressions of potholes can be repaired without cutting or repairing, and in difficult areas such as those around manholes, re-breakage is possible. Repairs are possible even in frequently used areas.

In particular, in areas where two different types of materials come into contact, such as damage to the gutter and the interface between the asphalt pavement surface and the concrete surface shown in Figure 5(c), the difference in material properties cannot be overcome and damage occurs, and in these cases, re-repair is required. Although the damaged part is repaired, damage occurs again soon after.

Accordingly, Figure 6 shows the process of constructing the repair binder mixture according to the present invention, and Figure 7 shows an example of applying this process to an actual road. As can be seen in the photograph of FIG. 7, by applying the repair binder mixture according to the present invention, repairs are made to the horizontal/vertical cracks as well as the surrounding branch cracks and fine cracks at once, preventing and blocking the infiltration of water and moisture. It can effectively prevent further damage to the repaired part.

The present invention is not limited to the specific embodiments and descriptions described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the invention as claimed in the claims. And such modifications are within the scope of protection of this invention.

Claims (11)

It contains 71 to 90% by weight of asphalt with a penetration degree of 60 to 80, 5 to 15% by weight of softener, 3 to 10% by weight of modifier, 0.5 to 3.0% by weight of heat stabilizer, and 0.1 to 1.0% by weight of bonding promoting antioxidant. ,
The softener is a mixture of two or more types from the group consisting of petroleum oil, coal oil, vegetable oil, aromatic oil, naphthenic oil, and paraffin oil,
The heat-resistant stabilizer is used alone or in a mixture of two or more types from the group consisting of paraffin wax, polyethylene wax, polypropylene wax, and EBS wax,
The bond-promoting antioxidant is a cross-linking material obtained through an exothermic reaction performed while stirring a mixture of 57.6% by weight of sulfur, 2.7% by weight of phenol, 6.6% by weight of phosphoric acid, and 33.1% by weight of sulfonic acid, and improves the bonding strength of asphalt and the modifier. It prevents deterioration of the composition and separation of materials, prevents aging and oxidation,
A thermoplastic modified repair binder that can repair various types of damage on roads.
Containing 15 to 35% by weight of the thermoplastic modified repair binder and 65 to 85% by weight of aggregate according to paragraph 1,
A thermoplastic modified repair binder mixture, characterized in that the aggregate is silica sand or filler.
delete delete According to paragraph 2,
A thermoplastic modified repair binder mixture, characterized in that it repairs cracks and simultaneously forms a waterproof layer.
According to paragraph 2,
A thermoplastic modified repair binder mixture, characterized in that leveling is formed by its own weight without separate compaction after laying.
According to paragraph 2,
A thermoplastic modified repair binder mixture, characterized in that it is constructed as a replacement for goose asphalt or expansion joints.
A heating step of heating the first mixture of 71 to 90% by weight of asphalt with a penetration degree of 60 to 80 and 5 to 15% by weight of softener to a temperature of 170 to 190 ° C.;
A first dispersion step of stirring a second mixture formed by mixing 3 to 10% by weight of a modifier in the heated first mixture;
A crosslinking step of crosslinking the second mixture in which the first dispersion step was performed by adding 0.1% to 1% of a bond-promoting antioxidant; and
It includes a second dispersion step of dispersing by adding 0.5 to 3% by weight of a heat-resistant stabilizer,
The softener is a mixture of two or more types from the group consisting of petroleum oil, coal oil, vegetable oil, aromatic oil, naphthenic oil, and paraffin oil,
The heat-resistant stabilizer is used alone or in a mixture of two or more types from the group consisting of paraffin wax, polyethylene wax, polypropylene wax, and EBS wax,
The bond-promoting antioxidant is a cross-linking material obtained through an exothermic reaction performed while stirring a mixture of 57.6% by weight of sulfur, 2.7% by weight of phenol, 6.6% by weight of phosphoric acid, and 33.1% by weight of sulfonic acid, and improves the bonding strength of asphalt and the modifier. A method of manufacturing a thermoplastic modified repair binder, characterized in that it prevents deterioration of the composition and separation of materials, and prevents aging and oxidation.
A heating step of heating a first mixture of 71 to 90% by weight of asphalt with a penetration degree of 60 to 80 and 5 to 15% by weight of a softener to a temperature of 170 to 190 ° C.;
A first dispersion step of stirring a second mixture formed by mixing 3 to 10% by weight of a modifier in the heated first mixture;
A crosslinking step of crosslinking the second mixture in which the first dispersion step was performed by adding 0.1% to 1% of a bond-promoting antioxidant;
A second dispersion step of adding and dispersing 0.5 to 3% by weight of a heat-resistant stabilizer; and
Including the step of further mixing the aggregate,
It contains 15 to 35% by weight of thermoplastic modified repair binder and 65 to 85% by weight of aggregate obtained through the second dispersion step,
The softener is a mixture of two or more types from the group consisting of petroleum oil, coal oil, vegetable oil, aromatic oil, naphthenic oil, and paraffin oil,
The aggregate is silica sand or filler,
The heat-resistant stabilizer is used alone or in a mixture of two or more types from the group consisting of paraffin wax, polyethylene wax, polypropylene wax, and EBS wax,
The bond-promoting antioxidant is a cross-linking material obtained through an exothermic reaction performed while stirring a mixture of 57.6% by weight of sulfur, 2.7% by weight of phenol, 6.6% by weight of phosphoric acid, and 33.1% by weight of sulfonic acid, and improves the bonding strength of asphalt and the modifier. A method for producing a thermoplastic modified repair binder mixture, characterized in that it prevents deterioration of the composition and separation of materials, and prevents aging and oxidation.
delete delete