Asphalt mixture for preventing potholes and plastic deformation by using steelmaking slag

Abstract

The present invention relates to an asphalt mixture comprising: (a) a steelmaking slag aggregate which has a size of more than 2.5 mm and less than 14 mm, and in which the proportion of plagioclase feldspar aggregates is 10% or less; (b) a general aggregate having a size of more than 0.075 mm and less than 6 mm; (c) an asphalt binder; (d) a filler; (e) a fiber additive; and (f) a liquid anti-stripping agent. The asphalt mixture of the present invention can prevent potholes and plastic deformation from occurring on road pavement by using the characteristics of steelmaking slag aggregates which have a silicate (SiO2) component in an amount lower than that in general aggregates, and which have interlocking performance higher than that of same.

Description

Asphalt mixture using steelmaking slag to prevent potholes and plastic deformation

[0001] The present invention relates to an asphalt mixture using steelmaking slag for preventing potholes and plastic deformation, and more particularly, to a steelmaking slag asphalt mixture for preventing potholes and plastic deformation in road pavement by utilizing the characteristics of steelmaking slag aggregate having a lower silicate (SiO2) content and higher interlocking performance than general aggregates.

[0002] Due to the expansion of social overhead capital and infrastructure and the expansion of housing and building construction, the demand for natural aggregates is continuously increasing. However, due to urbanization and environmental destruction, the supply and demand resources for natural aggregates are decreasing. In particular, the shortage of Grade 1 aggregates with a sizing ratio of 10% or less, which are used on roads with frequent plastic deformation and potholes and highways with high traffic speeds, is worsening every year.

[0003] In addition, due to rapid industrialization, road pavement damage is accelerating due to direct factors such as increased traffic volume and heavy vehicles, and indirect factors such as environmental changes such as heavy rain and snowfall. In urban roads, traffic volume continues to increase, and after the introduction of dedicated central bus lanes, heavy loads are concentrated in dedicated bus lanes, accelerating pavement damage such as the occurrence of potholes.

[0004] Furthermore, the use of sodium-based deicing agents in winter has been cited as a problem, causing aggregate expansion, resulting in potholes, and corrosion of road facilities and vehicles. While some eco-friendly deicing agents with reduced sodium content are being used, these agents are 3-5 times more expensive than refined salt and 1.4-2.0 times more expensive than calcium chloride, making them difficult to implement within limited road maintenance budgets.

[0005] In this regard, Korean Patent No. 10-1141259 discloses an eco-friendly room-temperature recycled paving material composition made by recycling waste asphalt and waste concrete, which contains waste asphalt and waste concrete as recycled aggregates, Portland cement, blast furnace slag, and quicklime as hardeners, waste concrete powder and blast furnace fly ash as fillers, a surfactant and a polymer modifier as emulsifiers, and emulsified asphalt as regeneration additives and Ethlyene Vinyl Acetate (EVA) and Ethyl Methyl Methacylate (EMMA) as binders.

[0006] However, the above patent document 1 does not disclose an asphalt mixture comprising (a) steel slag aggregate having a size of more than 2.5 mm and less than 14 mm with a feldspar ratio of 10% or less, (b) general aggregate having a size of more than 0.075 mm and less than 6 mm, (c) asphalt binder, (d) filler, (e) fiber additive, and (f) liquid anti-stripping agent, in order to prevent potholes and plastic deformation occurring in road pavement.

[0007] (Prior art literature)

[0008] (Patent Document 1) Korean Patent No. 10-1141259

[0009] The present invention is intended to solve the above problems, and the purpose of the present invention is to provide a pothole-preventing asphalt mixture that uses steel slag, a by-product of the steel industry, as an aggregate for an asphalt mixture, thereby preventing the occurrence of potholes in road pavement and having excellent long-term usability.

[0010] To achieve the above object, the present invention provides an asphalt mixture for preventing potholes and plastic deformation, comprising (a) steel slag aggregate having a size of more than 2.5 mm and less than 14 mm and having a feldspar ratio of 10% or less, (b) general aggregate having a size of more than 0.075 mm and less than 6 mm, (c) an asphalt binder, (d) a filler, (e) a fiber additive, and (f) a liquid anti-stripping agent.

[0011] In addition, according to the present invention, an asphalt mixture for preventing potholes and plastic deformation is provided, which comprises (a) 30.0 to 80.0 wt% of steelmaking slag aggregate having a size of more than 2.5 mm and less than 14 mm with a feldspar ratio of 10% or less, (b) 12.0 to 30.0 wt% of general aggregate having a size of more than 0.075 mm and less than 6 mm, (c) 1.7 to 7.0 wt% of asphalt binder, (d) 5.0 to 15.0 wt% of filler, (e) 0.3 to 2.0 wt% of fiber additive, and (f) 1.0 to 3.0 wt% of liquid anti-stripping agent.

[0012] In addition, according to the present invention, an asphalt mixture for preventing potholes and plastic deformation is provided, wherein the unit specific gravity of the (a) steelmaking slag aggregate is 3.00 on average, and the unit specific gravity of the asphalt mixture is 2.50 to 3.00.

[0013] In addition, according to the present invention, the (a) steelmaking slag aggregate provides an asphalt mixture for preventing potholes and plastic deformation, which has an interlocking performance measured according to the KS F 2384 method that is 17 to 18% higher than that of general aggregate.

[0014] In addition, according to the present invention, the (a) steelmaking slag aggregate provides an asphalt mixture for preventing potholes and plastic deformation, wherein the wear loss measured according to the KS F 2508 method as a standard for evaluating durability against chloride is 15 to 16% of the sample weight before measurement.

[0015] In addition, according to the present invention, the (a) steelmaking slag aggregate provides an asphalt mixture for preventing potholes and plastic deformation containing 10 to 20 wt% of silicate (SiO2).

[0016] In addition, according to the present invention, an asphalt mixture for preventing potholes and plastic deformation is provided, which comprises (a) steel slag aggregate and (b) general aggregate in a weight ratio of 1:0.2 to 0.4.

[0017] In addition, according to the present invention, an asphalt mixture for preventing potholes and plastic deformation is provided, wherein the (c) asphalt binder and (f) liquid anti-stripping agent are included in a weight ratio of 1:0.4 to 0.6.

[0018] In addition, according to the present invention, an asphalt mixture for preventing potholes and plastic deformation is provided, in which the total displacement measured according to the AASHTO T 324 method is 3.43 to 4.78 mm and SIP (Stripping Inflection Point) does not occur.

[0019] The invention's pothole-preventing steel slag asphalt mixture is excellent in preventing potholes by reducing the aggregate expansion phenomenon caused by sodium, the main ingredient in deicing agents, and its durability against heavy vehicle traffic is increased, greatly improving the long-term usability of bus-only lane roads.

[0020] In addition, the asphalt mixture of the present invention can reduce the occurrence of potholes by reducing the phenomenon of aggregates being detached and damaged from a road pavement due to the aggregates absorbing water and swelling due to an alkali-silica reaction.

[0021] Additionally, by using steel industry byproducts as high-quality, first-class aggregates, we can alleviate the shortage of aggregates and contribute to environmental protection by preserving forests destroyed by the extraction of natural aggregates.

[0022] In addition, the asphalt mixture using steel slag of the present invention has excellent deformation strength, dynamic stability and durability, can reduce maintenance costs due to improved road durability, prevents material separation, and has excellent mixing and workability.

[0023] Figure 1 is a photograph of steelmaking slag aggregate magnified 250 times using a scanning electron microscope (SEM).

[0024] Figure 2 shows the physical bonding structure of general aggregate and steelmaking slag aggregate and asphalt binder.

[0025] Figure 3 is a photograph showing the coating peeling resistance of steel slag aggregate to chloride compared to general aggregate.

[0026] Figure 4 is a graph showing the results of a SIP (Stripping Inflection Point) test of an asphalt mixture according to Example 1 and Comparative Example 1.

[0027] The present invention is described below. However, it is not limited to the following description, and each component may be modified or selectively mixed as needed. Therefore, it should be understood that all modifications, equivalents, and alternatives included within the spirit and technical scope of the present invention are included.

[0028] The asphalt mixture using steelmaking slag of the present invention comprises (a) steelmaking slag aggregate having a size of more than 2.5 mm and less than 14 mm and having a feldspar ratio of 10% or less, (b) general aggregate having a size of more than 0.075 mm and less than 6 mm, (c) asphalt binder, (d) filler, (e) fiber additive, and (f) liquid anti-stripping agent.

[0029] More preferably, the asphalt mixture of the present invention comprises (a) 30.0 to 80.0 wt% of steel slag aggregate having a size of more than 2.5 mm and less than 14 mm with a feldspar ratio of 10% or less, (b) 12.0 to 30.0 wt% of general aggregate having a size of more than 0.075 mm and less than 6 mm, (c) 1.7 to 7.0 wt% of asphalt binder, (d) 5.0 to 15.0 wt% of filler, (e) 0.3 to 2.0 wt% of fiber additive, and (f) 1.0 to 3.0 wt% of liquid anti-stripping agent.

[0030] In a preferred embodiment of the present invention, (a) the steelmaking slag aggregate having a size of more than 2.5 mm and less than 14 mm and having a feldspar ratio of 10% or less is used in an amount of 30.0 to 80.0 wt%, more preferably 50.0 to 80.0 wt%. When the above range is satisfied, the steelmaking slag aggregate exhibits the appropriate porosity and density required in the present invention, and both physical properties and working properties can be improved. More preferably, (a) the steelmaking slag aggregate having a size of more than 2.5 mm and less than 14 mm and having a feldspar ratio of 10% or less is used in an amount of about 60.0 wt%.

[0031] The steelmaking slag aggregate (a) used in the present invention is preferably a first-grade aggregate having a maximum length to minimum length ratio of 1:3 or more and a feldspar ratio of 10% or less. In addition, the main component of the steelmaking slag aggregate of (a) has a high iron (T-Fe) content as shown in Table 1 below, and thus has a high density as shown in Table 2 below. Accordingly, an asphalt mixture manufactured using steelmaking slag has a higher unit specific gravity than a general aggregate asphalt mixture. When a road pavement is saturated with moisture, the steelmaking slag asphalt mixture of the present invention has an increased ability to resist water pressure generated by traffic load due to its high dead load, and thus has excellent resistance to potholes generated by water pressure.

[0032] In addition, the (a) steel slag aggregate used in the present invention has higher voids and absorption rate than general aggregates, as shown in Table 2 below, so that a larger amount of asphalt binder than general aggregates penetrates into the aggregates during the process of manufacturing the steel slag asphalt mixture of the present invention, thereby improving the physical bonding strength between the aggregate and the asphalt binder (see Fig. 2). As a result of the aggregate-asphalt binder bonding strength test conducted by the “dynamic water immersion test” in Appendix IV-4 of the Asphalt Concrete Pavement Construction Guidelines, as shown in Table 3 below, the asphalt coating peeling resistance due to tire friction is improved by 61.9% compared to general aggregates.

[0033] No. Slag type CaOSiO₂T-FeAl2O₃1Converter furnace slag 35~4510~2020~30< 52Electric furnace oxidation slag 20~3010~2020~30< 103Electric furnace reduction slag 50~6010~20< 110~20

[0034] (Table 1: Chemical composition of the steelmaking slag aggregate of the present invention)

[0035] Absolute dry density (g / cm) 3 )Surface dry saturated density (g / cm) 3 ) True density (g / cm) 3 )Absorption rate (%)Steel slag aggregate 3.47 3.52 3.64 1.35 General aggregate 2.61 2.63 2.66 0.74

[0036] (Table 2: Volume characteristics of the steelmaking slag aggregate of the present invention)

[0037] Classification Dynamic water immersion coverage (%) ABC Average steelmaking slag aggregate 75707372.7 General aggregate 50454045.0

[0038] (Table 3: Coating peeling resistance of the steel slag aggregate of the present invention compared to general aggregate)

[0039]

[0040] In a preferred specific embodiment of the present invention, the (a) steelmaking slag may be an asphalt mixture that is one of converter slag containing 35 to 45 wt% of CaO, 10 to 20 wt% of SiO2, 20 to 30 wt% of T-Fe, and less than 35 wt% of Al2O3; and oxidized slag containing 20 to 30 wt% of CaO, 10 to 20 wt% of SiO2, 20 to 30 wt% of T-Fe, and less than 10 wt% of Al2O3.

[0041] In a preferred specific embodiment of the present invention, the (a) steelmaking slag has the characteristics of an absolute dry density of 3.4 to 3.5 g / cm3, a surface dry saturated density of 3.5 to 3.6 g / cm3, a true density of 3.6 to 3.7 g / cm3, an absorption rate of 1.3 to 1.4%, and a dynamic water immersion coverage rate of 70 to 75%.

[0042] In a preferred specific embodiment of the present invention, the unit specific gravity of the (a) steelmaking slag aggregate used in the present invention is 3.00 on average, and the unit specific gravity of the steelmaking slag asphalt mixture of the present invention using the same is 2.50 to 3.00. On the other hand, the unit specific gravity of general aggregate is 2.75 on average, and the unit specific gravity of the asphalt mixture using the same is 2.35 on average. Therefore, the steelmaking slag asphalt mixture of the present invention has a high unit specific gravity, and thus has the characteristic of increasing the self-weight that can withstand the water pressure generated by the traffic load when the road pavement is saturated with water, thereby suppressing the occurrence of potholes due to the water pressure.

[0043] In addition, the (a) steelmaking slag aggregate used in the present invention has an interlocking performance that is about 17 to 18% higher, more specifically, about 17.4% higher, than general aggregates due to its rough surface texture (see Fig. 1), as a result of KS F 2384 “Porosity Test of Uncompacted Aggregate”, a test method for quantifying the interlocking effect.

[0044] Meanwhile, as shown in Table 4 below, general aggregates are composed of 61 to 75% silicate (SiO2) components, and the alkaline sodium, which is the main component of snow removal materials, reacts with the silicate of the aggregate to form silica gel through the alkali-silica reaction (ASR). The silica gel absorbs a large amount of water, causing the aggregate to swell, weakening the bonding strength of the aggregate-asphalt binder and reducing the durability of the aggregate, which causes aggregate detachment, aggregate damage, and potholes in asphalt road pavement.

[0045] No. Rock type Chemical composition SiO₂Al₂O₃FeO₃MnOCaOMgOK2ONa2O1 Andesitic volcanic rock 68.60 111.049 2.8570.0686.604 0.9173.1932.4982 Sedimentary rock 61.001 14.29 14.4110.0743.6592.1072.5263.7923 Hohnfels 73.554 13.5764.1540.1530.9560.8120.9425.1244 Gangam70.64115.1292.7820.0651.3350.3123.8534.1035Granite74.95513.1891.9720.0411.0980.2423.8934.2056Andesite63.07017.1822.5140.0615.3011.1841.3736.3827Granite + Andesite66.99716.4152.6140.0603.1740.7562.4455.973

[0046] (Table 4: Chemical composition of common aggregates)

[0047]

[0048] On the other hand, the (a) steelmaking slag aggregate according to the present invention is composed of 10 to 20 wt% of silicate components and thus causes a lower alkali-silica reaction than general aggregates, thereby suppressing phenomena such as aggregate detachment, aggregate damage, and pothole occurrence due to re-slag.

[0049] Meanwhile, in the case of the (a) steelmaking slag aggregate according to the present invention, a durability test of the aggregate was conducted by saturating the general aggregate and the steelmaking slag aggregate in a solution having a sodium content of 20%, which is the main component of the desalination material, for 24 hours and using KS F 2508 “Abrasion test method for coarse aggregate by Los Angeles tester”, and as a result, as shown in Table 5 below, the steelmaking slag aggregate has a salt resistance that is 217.8% higher in durability reduction by chlorides such as desalination material compared to the general aggregate.

[0050] Before test (g) After test (g) Wear loss (%) Total mass (g) Steel slag aggregate 500 2.44 241.9 15.23 327.6 General aggregate 500 3.53 348.0 33.13 348.0

[0051] (Table 5: Chloride resistance of the steel slag aggregate of the present invention compared to general aggregate)

[0052] That is, it can be confirmed that the wear loss of the (a) steelmaking slag aggregate according to the present invention, as measured according to the KS F 2508 method as a standard for evaluating durability against chloride, is about 15 to 16%, more specifically, about 15.2%, of the sample weight before measurement.

[0053] In addition, in the case of the (a) steelmaking slag aggregate according to the present invention, when general aggregate and steelmaking slag aggregate were saturated in a solution having a sodium content of 20% for 24 hours and an aggregate-asphalt binder bonding test was conducted according to the “dynamic water immersion test” in Appendix IV-4 of the asphalt concrete pavement construction guidelines, as a result, as shown in Table 6 and Figure 3 below, the steelmaking slag aggregate has a bonding strength of the aggregate-asphalt binder that is 237.2% higher than that of general aggregate due to chlorides such as de-icing agents.

[0054] Classification Dynamic water immersion coverage (%) ABC Average steelmaking slag aggregate 57586359.3 General aggregate 30202525.0

[0055] (Table 6: Chloride-induced coating peeling resistance of the steelmaking slag aggregate of the present invention compared to general aggregate)

[0056] In addition, the asphalt concrete mixture using the (a) steelmaking slag aggregate of the present invention improves the interlocking performance between aggregates, thereby increasing the plastic deformation resistance by 150% or more compared to an asphalt mixture manufactured with general aggregates.

[0057] In a preferred embodiment of the present invention, the general aggregate having a size of (b) exceeding 0.075 mm and less than 6 mm is used in an amount of 12.0 to 30.0 wt%. If the amount exceeds the above range, there is a problem in that the durability and mixing properties required in the present invention cannot be obtained. More preferably, the general aggregate having a size of (b) exceeding 0.075 mm and less than 6 mm is used in an amount of about 20.0 wt%.

[0058] In a preferred embodiment of the present invention, the asphalt mixture may include (a) steel slag aggregate and (b) general aggregate in a weight ratio of about 1:0.2 to 0.4. By including the above range, the asphalt mixture has excellent mixing and workability, and excellent durability and mechanical strength.

[0059] In a preferred embodiment of the present invention, the (c) asphalt binder is used in an amount of 1.7 to 7.0 wt%. If the amount exceeds the above range, cracks may occur or elasticity may deteriorate. More preferably, the (c) asphalt binder is used in an amount of about 6.0 wt%.

[0060] In a preferred embodiment of the present invention, the filler (d) is used in an amount of 5.0 to 15.0 wt%. If the amount exceeds the above range, there is a problem of material separation occurring or durability deteriorating. More preferably, the filler (d) is a mineral material powder such as lime, slaked lime, fly ash, recovered dust, or steelmaking dust, used in an amount of about 10.0 wt%.

[0061] In a preferred embodiment of the present invention, the (e) fiber additive is used in an amount of 0.3 to 2.0 wt%. If the amount exceeds the above range, there is a problem of reduced durability or cracking. More preferably, the (e) fiber additive is a cellulose fiber additive used in an amount of about 1.0 wt%.

[0062] In a preferred specific embodiment of the present invention, the (f) liquid anti-stripping agent is used in an amount of 1.0 to 3.0 wt%, and when the above range is satisfied, the mixing and compacting properties are improved, the long-term durability of the asphalt mixture is improved, and the resistance to plastic deformation or moisture damage in a submerged state of the asphalt mixture is further improved. More preferably, as the (f) liquid anti-stripping agent, a polyphosphoric acid-based, amine-based, or phosphate ester-based liquid anti-stripping agent is used in an amount of about 3.0 wt%.

[0063] In a preferred embodiment of the present invention, the asphalt mixture may include (c) an asphalt binder and (f) a liquid anti-stripping agent in a weight ratio of about 1:0.4 to 0.6. By including the above range, the mixing and compacting properties of the asphalt mixture are improved, thereby further suppressing the occurrence of potholes.

[0064] Hereinafter, the present invention will be described in more detail based on examples. However, the scope of the present invention is not limited to the following examples.

[0065]

[0066] Example 1

[0067] An asphalt mixture was prepared by mixing (a) 60.0 wt% of steelmaking slag aggregate having a size of 2.5 mm to less than 14 mm and having a slag fraction of 10% or less, (b) 20.0 wt% of general aggregate having a size of 0.075 mm to less than 6 mm, (c) 6.0 wt% of asphalt binder, (d) 10.0 wt% of filler, (e) 1.0 wt% of fiber additive, and (f) 3.0 wt% of liquid anti-stripping agent.

[0068]

[0069] Comparative Example 1

[0070] (d) An asphalt mixture was prepared in the same manner as in Example 1, except that 13.0 wt% of filler was used and (f) no liquid anti-stripping agent was used.

[0071]

[0072] Experimental Example 1

[0073] Regarding Example 1 and Comparative Example 1 of the present invention, the test results measured based on the Hamburg Wheel Tracking Test (AASHTO T 324), which can simultaneously measure plastic deformation and moisture sensitivity along with the existing moisture resistance test (Tensile Strength Ratio, TSR) by many state transportation departments in the United States, are shown in the table below.

[0074] The above Hamburg wheel tracking test is a test that measures the amount of settlement each time by repeatedly applying a wheel load of 705±4.5N to a compacted test specimen while it is submerged in water at a set test temperature. The specimen is placed in a test tank capable of maintaining and managing a constant temperature (50±1℃) and the wheel speed is 52±2 times per minute, and 20,000 times are applied to perform the test twice for each mixture.

[0075] Number of tests Total displacement (mm) SIP (mm / passes) SIP displacement (mm) SIP underground Number of tests Example 114.78 Not occurred--23.43 Not occurred--Comparative example 119.110.0005636.4515,28127.100.0003615.8316,497

[0076] (Table 7: Hamburg wheel tracking test results for Example 1 and Comparative Example 1)

[0077]

[0078] Referring to Table 7 above, the asphalt mixture of Example 1 of the present invention has a total displacement (amount of plastic deformation) of 3.43 to 4.78 mm measured according to the AASHTO T 324 method, and more specifically, the total displacement (amount of plastic deformation) that occurred while the wheel load was repeatedly applied was 4.1 mm on average for Example 1 and 8.1 mm on average for Comparative Example 1, confirming that the resistance to plastic deformation in a submerged state of the asphalt mixture of Example 1 is approximately twice as excellent.

[0079] In addition, as can be seen in FIG. 4, in the case of Example 1 of the present invention, SIP did not occur during the test, confirming that the water resistance to wheel load in a submerged state is excellent.

[0080] On the other hand, in the case of Comparative Example 1, an inflection point was found where the displacement caused by repeated wheel loads rapidly increased, which means that the asphalt of the asphalt mixture was peeled off, the bonding strength of the mixture was reduced, and delamination occurred, resulting in the occurrence of a Stripping Inflection Point (SIP) where the displacement rapidly increased.

[0081] In summary, Example 1 of the present invention has a smaller total displacement than Comparative Example 1 under the same load and water immersion environment, and does not cause an inflection point SIP where delamination of the asphalt mixture occurs, confirming that the asphalt mixture according to the present invention has considerably excellent resistance to moisture damage.

Claims

1. (a) Steel slag aggregate with a size of 2.5 mm or more and less than 14 mm with a proportion of slag particles of 10% or less; (b) Ordinary aggregate exceeding 0.075 mm and less than 6 mm; (c) asphalt binder, (d) filler, (e) fiber additives, and (f) Asphalt mixture containing a liquid anti-stripping agent for preventing potholes and plastic deformation.

2. In paragraph 1, (a) 30.0 to 80.0 wt% of steelmaking slag aggregate with a size of 2.5 mm to 14 mm and a slag content of 10% or less, (b) 12.0 to 30.0 wt% of ordinary aggregate exceeding 0.075 mm and less than 6 mm, (c) 1.7 to 7.0 wt% of asphalt binder, (d) 5.0 to 15.0 wt% of filler, (e) 0.3 to 2.0 wt% of fiber additives, and (f) An asphalt mixture for preventing potholes and plastic deformation, characterized in that it contains 1.0 to 3.0 wt% of a liquid anti-stripping agent.

3. In paragraph 1, An asphalt mixture for preventing potholes and plastic deformation, characterized in that the unit specific gravity of the steelmaking slag aggregate of (a) above is 3.00 on average and the unit specific gravity of the asphalt mixture is 2.50 to 3.

00.

4. In paragraph 1, The above (a) steelmaking slag aggregate is an asphalt mixture for preventing potholes and plastic deformation, characterized in that the interlocking performance measured according to the KS F 2384 method is 17 to 18% higher than that of general aggregate.

5. In paragraph 1, The above (a) steelmaking slag aggregate is an asphalt mixture for preventing potholes and plastic deformation, characterized in that the wear loss measured according to the KS F 2508 method as a standard for evaluating durability against chloride is 15 to 16% of the sample weight before measurement.

6. In paragraph 1, An asphalt mixture for preventing potholes and plastic deformation, characterized in that the above (a) steelmaking slag aggregate contains 10 to 20 wt% of silicate (SiO2).

7. In paragraph 2, An asphalt mixture for preventing potholes and plastic deformation, characterized in that the above (a) steel slag aggregate and (b) general aggregate are included in a weight ratio of 1:0.2 to 0.

4.

8. In paragraph 2, An asphalt mixture for preventing potholes and plastic deformation, characterized in that the above (c) asphalt binder and (f) liquid anti-stripping agent are included in a weight ratio of 1:0.4 to 0.

6.

9. In paragraph 1, The above asphalt mixture is an asphalt mixture for preventing potholes and plastic deformation, characterized in that the total displacement measured according to the AASHTO T 324 method is 3.43 to 4.78 mm and SIP (Stripping Inflection Point) does not occur.

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