Bio-asphalt composition and method for producing same

Abstract

The present invention relates to a bio-asphalt composition and a method for producing same. More specifically, the present invention relates to: a bio-asphalt composition including vacuum residue (VR), vacuum tower bottom (VTB), and a softening additive; and a method for producing same. The present invention relates to: a bio-asphalt composition in which a small amount of a softening additive is blended compared to heavy vacuum residue, and which thus has improved low-temperature and high-temperature properties and satisfies asphalt quality standards; and a method for producing same.

Description

Bioasphalt composition and method for manufacturing the same

[0001] The present invention relates to a bioasphalt composition and a method for manufacturing the same. More specifically, the present invention relates to a bioasphalt composition comprising vacuum residue (VR), vacuum tower bottom (VTB), and a softening additive, and a method for manufacturing the same, wherein a smaller amount of softening additive is mixed compared to heavy vacuum diesel oil, thereby improving high and low temperature characteristics and satisfying asphalt quality standards, and a bioasphalt composition and a method for manufacturing the same.

[0002] According to conventional asphalt manufacturing methods, asphalt is produced by using vacuum residue (VR), which is generated by vacuum distilling residual oil from atmospheric distillation during the crude oil refining process, either alone or by mixing it with Heavy Vacuum Gas Oil (HVGO) when vacuum residue alone cannot meet asphalt quality standards. When asphalt is manufactured according to such conventional methods, the entire asphalt consists of petroleum-based raw materials.

[0003] With the recent revision of the Ministry of Land, Infrastructure and Transport's guidelines for asphalt concrete pavement construction, the concept of bio-asphalt has been introduced. Bio-asphalt is an eco-friendly asphalt material that is garnering international attention as a sustainable construction material; it is manufactured by utilizing renewable biomass resources to replace and blend a portion of petroleum-based asphalt. In this process, bio-asphalt must possess the same performance and quality as petroleum-based asphalt, which is evaluated based on penetration and performance grades. When using softening additives containing plant-based raw materials instead of the petroleum-based raw material Heavy Vacuum Gas (HVGO), these additives must be mixed in at a concentration sufficient to satisfy the penetration and performance grade requirements.

[0004] Meanwhile, VTB (Vacuum Tower Bottom) refers to the residue remaining after refining in the vacuum residue hydrocracker process. Since its quality is inferior to vacuum residue in terms of physical properties, manufacturing asphalt becomes difficult as the VTB content increases. Furthermore, the content of VTB and softening additives that can be used to produce asphalt varies depending on the characteristics of the VTB and vacuum residue. Consequently, there are technical challenges in manufacturing asphalt that meets quality standards by including vacuum residue, VTB, and softening additives.

[0005] The present invention aims to provide a bio-asphalt composition that satisfies asphalt quality standards by mixing a small amount of softening additive compared to heavy vacuum diesel fuel, and a method for manufacturing the same. Furthermore, the present invention aims to provide a bio-asphalt composition with improved high and low temperature characteristics that overcomes the problems of the prior art, and a method for manufacturing the same.

[0006] The objectives of the present invention are not limited to those mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0007] To achieve the above objective, a bioasphalt composition according to one embodiment of the present invention may comprise an asphalt mixture comprising vacuum residue and vacuum tower bottom (VTB), and a softening additive derived from plant-based raw materials.

[0008] The above bioasphalt composition may contain 5 to 25 parts by weight of the VTB based on 100 parts by weight of the bioasphalt composition.

[0009] The above bioasphalt composition may contain 2.6 to 4.5 parts by weight of the softening additive based on 100 parts by weight of the bioasphalt composition.

[0010] The softening additive included in the above bioasphalt composition may include one or more of rosin, palm oil, and soybean oil.

[0011] The above bioasphalt composition may contain 15 to 30 parts by weight of rosin and 70 to 85 parts by weight of palm oil, based on 100 parts by weight of the softening additive.

[0012] The above bioasphalt composition may not contain heavy vacuum oil.

[0013] A method for manufacturing a bioasphalt composition according to another aspect of the present invention may include the following steps:

[0014] (S1) A step of obtaining a heated asphalt mixture by heating an asphalt mixture containing vacuum residue and VTB (Vacuum Tower Bottom) until it reaches 130 to 160°C; and

[0015] (S2) A step of injecting a softening additive derived from plant raw materials into the heated asphalt mixture and mixing for 5 to 60 minutes.

[0016] The bioasphalt composition produced by the above manufacturing method may contain 5 to 25 parts by weight of the VTB based on 100 parts by weight of the bioasphalt composition.

[0017] The bioasphalt composition produced by the above manufacturing method may contain 2.6 to 4.5 parts by weight of the softening additive based on 100 parts by weight of bioasphalt.

[0018] The softening additive included in the bioasphalt composition produced by the above manufacturing method may include one or more of rosin, palm oil, and soybean oil.

[0019] The bioasphalt composition produced by the above manufacturing method may contain 19 to 23 parts by weight of rosin and 77 to 81 parts by weight of palm oil, based on 100 parts by weight of the softening additive.

[0020] The asphalt mixture used in the above manufacturing method may not contain heavy vacuum oil.

[0021] The bioasphalt composition and method for manufacturing the same according to the present invention can control the penetration of asphalt with a smaller amount compared to heavy vacuum diesel by using a softening additive containing plant-based raw materials instead of heavy vacuum diesel.

[0022] Furthermore, the bioasphalt composition and the method for manufacturing the same according to the present invention can improve the dynamic shear of the original asphalt, the dynamic shear after RTFO aging, and the bending creep gradient after PAV aging by using a softening additive containing plant-based raw materials compared to the case where heavy vacuum diesel is used, and can improve the elongation after thin film heating.

[0023] In addition, the bioasphalt composition and the method for manufacturing the same according to the present invention may include vacuum residue oil, VTB (Vacuum Tower Bottom), and plant-based raw materials.

[0024] In addition to the effects described above, the effects of the present invention are described together with the details for implementing the invention below.

[0025] The aforementioned objectives, features, and advantages are described in detail below with reference to the description of the invention, and accordingly, a person skilled in the art to which the invention pertains will be able to easily implement the technical concept of the invention. In describing the invention, detailed descriptions of known technologies related to the invention are omitted if it is determined that such descriptions may unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail.

[0026] Where terms such as "comprising," "having," "consisting of," "arranging," or "having" are used for a component in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise.

[0027] In interpreting the components in this specification, they are interpreted to include an error range even if there is no separate explicit description.

[0028] In this specification, the standard for units is weight (wt) unless otherwise specifically stated. For example, if "%" is indicated, it is interpreted as weight % (wt%).

[0029] The present invention will be described in more detail below.

[0030] Bioasphalt composition

[0031] The bioasphalt composition according to the present invention comprises an asphalt mixture including vacuum residue and vacuum tower bottom (VTB); and a softening additive, wherein the softening additive may be derived from plant-based raw materials.

[0032] The above vacuum residue refers to the residue remaining after refining crude oil, specifically the oil fraction that remains after no further distillation occurs during the vacuum distillation process. The above vacuum residue is used as feed for a vacuum residue hydrocracker. In particular, the above vacuum residue is mixed with crushed stone, sand, stone powder, etc., to become a material for asphalt. According to one example of the present invention, the vacuum residue may be included in an amount of 70 to 95 parts by weight, for example, 70 to 90 parts by weight, based on 100 parts by weight of the bioasphalt composition. If the content of the above vacuum residue is exceeded, there may be a problem in that the ductility, penetration, and / or performance grades after thin-film heating do not satisfy quality standards.

[0033] The above VTB (Vacuum Tower Bottom) refers to the oil fraction remaining after no further distillation in the vacuum residue hydrocracker process. Preferably, according to one example of the present invention, the VTB may be included in an amount of 5 to 25 parts by weight based on 100 parts by weight of the bioasphalt composition. If the content of the VTB deviates from the above, there may be a problem in which one or more of the dynamic shear after PAV aging and the elongation after thin film heating fail to satisfy quality standards.

[0034] The above softening additive refers to an additive added for softening asphalt. Preferably, according to one example of the present invention, the above softening additive may be included in an amount of 2.6 to 4.5 parts by weight, for example 2.6 to 4.0 parts by weight, for example 2.6 to 3.8 parts by weight, based on 100 parts by weight of the bioasphalt composition. If the content of the above softening additive is outside this range, there may be a problem in which one or more of the penetration, performance grade, and elongation after thin film heating fail to satisfy quality standards.

[0035] The above-mentioned softening additive is derived from plant-based raw materials and may include, for example, rosin, soybean oil, palm oil, etc. According to one example, the bioasphalt composition according to the present invention may include rosin in an amount of 15 to 30 parts by weight, for example 15 to 23 parts by weight, for example 19 to 23 parts by weight, and palm oil in an amount of 70 to 85 parts by weight, for example 77 to 85 parts by weight, for example 77 to 81 parts by weight, based on 100 parts by weight of the above-mentioned plant-based raw materials. If the above mixing ratio is deviated from, there may be a problem in that the elongation after thin-film heating does not satisfy the quality standards.

[0036] A bioasphalt composition according to one example of the present invention may have a penetration of 61 to 80 dmm at 25°C according to the KS M 2201 grade standard.

[0037] A bioasphalt composition according to one example of the present invention may have a dynamic shear of 1.00 kPa to 1.50 kPa at 64°C according to the KS F 2389 grading standard.

[0038] A bioasphalt composition according to one example of the present invention may have a dynamic shear of 2.20 kPa to 3.50 kPa after aging at 64°C RTFO according to the KS F 2389 grade standard.

[0039] The bioasphalt composition according to the present invention may have a dynamic shear of 3,000 kPa to 5,000 kPa after aging at 25°C PAV according to the KS F 2389 grade standard.

[0040] The bioasphalt composition according to the present invention may have a bending creep gradient of 0.300 to 0.350 after aging at -12℃ PAV according to the KS F 2389 grade standard.

[0041] The bioasphalt composition according to the present invention may have an elongation of 40 cm to 120 cm after thin-film heating at 15°C according to the KS M 2201 grade standard.

[0042] Method for manufacturing a bioasphalt composition

[0043] A method for manufacturing a bioasphalt composition according to the present invention may include: (S1) a step of obtaining a heated asphalt mixture by heating an asphalt mixture containing vacuum residue and VTB (Vacuum Tower Bottom) until it reaches 130 to 160°C; and (S2) a step of injecting a softening additive derived from plant raw materials into the heated asphalt mixture and mixing for 5 to 60 minutes.

[0044] The above step (S1) is a step of mixing vacuum residue oil and VTB and then heating, so that the vacuum residue oil and VTB melt from a solid state into a liquid state with fluidity, thereby ensuring conditions for uniform mixing. For this reason, it is desirable to heat at least 130°C, and it is desirable to heat to 160°C or lower, as if the temperature becomes too high, the oxidation of the mixture of vacuum residue oil and VTB may accelerate and change physical properties.

[0045] Then, in step (S2), the penetration of the asphalt mixture produced in step (S1) is checked, and a softening additive derived from plant-based raw materials is mixed according to the result. This has the advantage of making it easier to predict the penetration of the final asphalt mixture compared to injecting the softening additive simultaneously with vacuum residue oil and VTB during the mixing step, thereby increasing the likelihood that the final mixture will satisfy asphalt quality standards. The mixing time in step (S2) can be adjusted according to the total amount of the mixture, for example, from 5 to 60 minutes, for example, from 10 to 40 minutes, but is not limited thereto.

[0046] The structure and operation of the present invention will be described in more detail below through preferred embodiments. However, these are presented as preferred examples of the present invention and should not be interpreted in any way as limiting the present invention.

[0047] <Examples and Comparative Examples>

[0048] In the present invention, bioasphalt compositions of Examples 1 to 5 and Comparative Examples 1 to 9 were prepared by mixing according to the composition and content (parts by weight) described in Tables 1 to 4 below.

[0049] An asphalt mixture mixed according to the composition and content (parts by weight) listed in Tables 1 to 4 below was heated to 140°C. A softening additive containing plant-based raw materials was injected into the heated asphalt mixture and mixed for 30 minutes. Afterward, the mixture was cooled to room temperature to obtain an asphalt composition.

[0050] Examples 1 to 3 and Comparative Examples 1 to 7 described in Tables 1 and 2 below used vegetable oils comprising 20 parts by weight of rosin and 80 parts by weight of palm oleic oil, when the total weight of the softening additive was 100 parts by weight.

[0051] Ingredients (Weight%) Example 1 Example 2 Example 3 Asphalt Mixture Vacuum Tower Bottom Oil 77.1 76.2 86.5 VTB (Vacuum Tower Bottom) 2020 100 Heavy Vacuum Diesel 000 Softening Additives 2.9 3.8 3.5 Total 100 100 100

[0052] Ingredients (Weight%) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Asphalt Mixture Vacuum Residue Oil 67.26 6.87 7.67 57 21000 VTB (Vacuum Tower Bottom) 30 30 20 20 20 100 Heavy Vacuum Diesel 00 05 800 Softening Additives 2.84 22.40 000 Total 100 100 100 100 100 100 100

[0053] Examples 4 and 5 and Comparative Examples 8 and 9 described in Tables 3 and 4 below used vegetable oils containing 15 parts by weight of rosin and 85 parts by weight of palm oleic oil when the total weight of the softening additive was 100 parts by weight.

[0054] Ingredients (Weight%) Example 4 Example 5 Asphalt Mixture Vacuum Tower Bottom Oil 877 6.5 VTB (Vacuum Tower Bottom) 1020 Heavy Vacuum Diesel 00 Softening Additive 3.0 3.5 Total 100 100

[0055] Ingredients (Weight%) Comparative Example 8 Comparative Example 9 Asphalt Mixture Vacuum Tower Bottom Oil 8.27 7.8 VTB (Vacuum Tower Bottom) 10.20 Heavy Vacuum Diesel 00 Softening Additives 1.82.2 Total 100 100

[0056] The above Examples 1 to 5 and Comparative Examples 1 to 9 were measured and evaluated according to Experimental Examples 1 to 3 below, and the results are shown in Tables 5 to 16 below.

[0057] <Experimental Example 1> Evaluation of Asphalt Quality Standards by Penetration Grade

[0058] The bioasphalt composition of the present invention aims to satisfy the quality standards for a PG 64-22 grade of performance grade, and current quality standards for asphalt for domestic and export use define the penetration grade as 61 to 80. The quality standards, test methods, and measurement results for each item to be satisfied according to the penetration grade of 61 to 80, as well as for Examples 1 to 5 and Comparative Examples 1 to 9, are shown in Tables 5 to 8 below.

[0059] Test Item Test Method Quality Standard Example 1 Example 2 Example 3 Penetration (25℃, dmm) KS M 225 261~80737879 Softening Point (℃) KS M 2250 44.0~52.046.645.245.4 Elongation (15℃, cm) KS M 225 4100 or more 140 or more 140 or more 140 or more Viscosity (135℃, cP) KS F 239 23,000 or less 364336360 Toluene Soluble (wt%) KS M 220 199.0 or more 99.699.699.5 Flash Point (℃) KS M ISO 259 2260 or more 320 or more 320 or more 320 or more Mass Change Rate After Heating Thin Film (wt%) KS M 220 10.6 0.0 or less 20.20.01 Residual penetration rate (%) after thin film heating KS M 220 155 or more 626365 Penetration ratio (%) after evaporation KS M 220 1110 or less 869099 Density (15℃, g / cm³ 3 )KS M 22011 or higher 1 or higher 1 or higher 1 or higher

[0060] Test Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Penetration (25℃, dmm) 60 78 616 179 4616 Softening Point (℃) 47.4 45.0 47.2 47.2 44.8 49.856 Elongation (15℃, cm) 140 or more 140 or more 140 or more 140 or more 140 or more 140 or more 0 Viscosity (135℃, cP) 368 313 385 349 2915 11382 Toluene Soluble (wt%) 99.5 99.6 99.6 99.5 99.5 99.8 98.9 Flash Point (℃) 320 or more 320 or more 320 or more 320 or more 320 or more 320 or more 320 or more Mass Change Rate After Heating Thin Film (wt%) 0.04 0.08 0.07 0.02 0.03 0.38 Residual penetration rate after thin film heating (%) 58 59 61 66 60 72 69 Penetration ratio after evaporation (%) 92 89 90 86 87 10 196 Density (15℃, g / cm³ 3 )1 or more 1 or more 1 or more 1 or more 1 or more 1 or more 1 or more

[0061] Test Item Test Method Quality Standard Example 4 Example 5 Penetration (25℃, dmm) KS M 225 261~807777 Softening Point (℃) KS M 225 44.0~52.0 46.0 45.6 Elongation (15℃, cm) KS M 225 4100 or more 140 or more 140 or more Viscosity (135℃, cP) KS F 239 23,000 or less 375340 Toluene Soluble (wt%) KS M 220 199.0 or more 99.6 99.6 Flash Point (℃) KS M ISO 259 2260 or more 320 or more 320 or more Change in Mass after Thin Film Heating (wt%) KS M 220 10.6 or less 00.07 Residual Penetration Rate after Thin Film Heating (%) KS M 220 155 Ratio of penetration after evaporation (%) KS M 220 1110 8783 Density (15℃, g / cm³ 3 )KS M 22011 or higher 1 or higher 1 or higher

[0062] Test Item Comparative Example 8 Comparative Example 9 Penetration (25℃, dmm) 60 61 Softening Point (℃) 48.4 47.4 Elongation (15℃, cm) 140 or more 140 or more Viscosity (135℃, cP) 415 380 Toluene Soluble (wt%) 99.6 99.5 Flash Point (℃) 320 or more 320 or more Rate of Mass Change After Thin Film Heating (wt%) 00.07 Residual Penetration Rate After Thin Film Heating (%) 60.0 59.0 Ratio of Penetration After Evaporation (%) 89 89 Density (15℃, g / cm³ 3 )1 or more 1 or more

[0063] As shown in Tables 5 to 8 above, Examples 1 to 5 satisfied all quality standards for penetration, softening point, elongation, viscosity, toluene-soluble content, flash point, mass change rate after thin-film heating, penetration retention rate after thin-film heating, penetration ratio after evaporation, and density; however, Comparative Examples 1, 6 to 8 showed a penetration of less than 61, indicating that they did not satisfy the quality standards for asphalt for domestic and export use. Comparing Examples 1 to 5 and Comparative Examples 1 and 7, it can be seen that when VTB is applied at a high content of 30 weight% or more, or when only VTB is used, the quality standards for asphalt for domestic and export use are not satisfied. Furthermore, comparing Examples 1 to 5 and Comparative Example 6, it can be seen that vacuum residue oil alone does not satisfy the quality standards for asphalt for domestic and export use. In addition, by comparing Examples 1, 2, and 5 and Comparative Examples 4 and 5, it can be seen that when using a softening additive compared to when using HVGO, the penetration grade can be controlled within the quality standard with a smaller amount.

[0064] <Experimental Example 2> Evaluation of Commonality Grade

[0065] To verify the physical properties of the asphalt composition, the serviceability of short-term, long-term aged, and unaged asphalt compositions was measured through PG grade testing. A Rolling Thin Film Oven (RTFO) was used for short-term aging, a Pressure Aging Vessel (PAV) was used for long-term aging, and a Dynamic Shear Rheometer (DSR) was used to determine the composite shear coefficient (G * Measures the ) and phase angle (δ). Complex pre-sheath number (G *) refers to the shear resistance to deformation under conditions of continuous shear, expressed as the ratio of shear stress to shear deformation. The phase angle δ represents the relative displacement of viscous and elastic deformation. Dynamic shear is, after aging of original asphalt and RTFO, G * / sinδ, PAV After aging is G * It is expressed as ×sinδ and is stipulated to have a value of 1.0 kPa or higher for original asphalt, 2.2 kPa or higher after RTFO aging, and 5,000 kPa or lower after PAV aging.

[0066] The measurement of flexural creep stiffness, a low-temperature characteristic of asphalt compositions, is intended to evaluate the low-temperature cracking resistance of asphalt compositions after PAV aging using a bending beam rheometer (BBR). To this end, the stiffness and creep rate (m-value) of the specimen are measured under creep load, and the flexural creep stiffness is specified to be 300 MPa or less, and the m-value is specified to be 0.3 or greater.

[0067] The quality standards, test methods, and measurement results for each item for Examples 1 to 5 and Comparative Examples 1 to 9, which must be satisfied according to the commonality grade PG 64-22, are shown in Tables 9 to 12 below.

[0068] Test Item Test Method Quality Standard Example 1 Example 2 Example 3 Raw Asphalt Dynamic Shear (64℃, kPa) KS F 239 31.0 or greater 1.14 1.0 5 1.10 RTFO Dynamic Shear After Aging (64℃, kPa) KS F 239 32.2 or greater 2.7 7 2.5 5 2.48 PAV Dynamic Shear After Aging (25℃, kPa) KS F 239 35,000 or less 3.4 27 3.5 95 3.117 Flexural Creep Stiffness (s, -12℃, MPa) KS F 239 300 or less 166 167 150 Flexural Creep Inclination (m, -12℃) KS F 239 00.3 or greater 0.3 32 0.3 20 0.3 35

[0069] Test Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Pure Asphalt Dynamic Shear (64℃, kPa) 1.30 0.9 5 1.36 1.26 0.8 7 2.08 3.92 RTFO Dynamic Shear After Aging (64℃, kPa) 3.4 7 2.7 4 3.27 2.9 6 1.9 4 4.33 19.6 PAV Dynamic Shear After Aging (25℃, kPa) 5.06 13.728 4.75 44.724 3.309 5.539 - Flexural Creep Stiffness (s, -12℃, MPa) 20 117 420 4226 18 62234 14 Flexural Creep Inclination (m, -12℃)0.2910.3090.2980.2860.3120.2870.185

[0070] Test Item Test Method Quality Standard Example 4 Example 5 Raw Asphalt Dynamic Shear (64℃, kPa) KS F 239 31.0 or greater 1.14 1.06 RTFO Dynamic Shear After Aging (64℃, kPa) KS F 239 32.2 or greater 2.58 2.61 PAV Dynamic Shear After Aging (25℃, kPa) KS F 239 35.00 or less 3.179 3.720 Flexural Creep Stiffness (s, -12℃, MPa) KS F 239 300 or less 148 164 Flexural Creep Inclination (m, -12℃) KS F 239 00.3 or greater 0.32 30.314

[0071] Test Item Comparison Example 8 Comparison Example 9 Pure Asphalt Dynamic Shear (64℃, kPa) 1.47 1.37 RTFO Dynamic Shear After Aging (64℃, kPa) 3.38 3.43 PAV Dynamic Shear After Aging (25℃, kPa) 4.34 24.710 Flexural Creep Stiffness (s, -12℃, MPa) 192 195 Flexural Creep Inclination (m, -12℃) 0.30 70.296

[0072] As shown in Tables 9 to 12 above, Examples 1 to 5 satisfied the PG 64-22 grade, which is the quality standard for water-resistant asphalt, for original asphalt dynamic shear, dynamic shear after RTFO aging, dynamic shear after PAV aging, flexural creep stiffness after PAV aging, and flexural creep gradient after PAV aging, but Comparative Examples 1 to 7 and 9 did not satisfy the quality standard. Specifically, when comparing Examples 1 to 5 and Comparative Examples 1 and 2, it can be seen that when VTB is applied at a high content of 30 weight% or more, the original asphalt dynamic shear, dynamic shear after PAV aging, and / or flexural creep gradient after PAV aging do not satisfy the quality standard. When comparing Examples 1 to 5 and Comparative Examples 3 and 9, it can be seen that when a small amount of softening additive is applied, the flexural creep gradient after PAV aging does not satisfy the quality standard. Comparing Examples 1 to 5 and Comparative Examples 4 and 5, it can be seen that when heavy vacuum diesel is used instead of a softening additive, the dynamic shear of raw asphalt, the dynamic shear after RTFO aging, and / or the bending creep slope after PAV aging do not satisfy the quality standards. Comparing Examples 1 to 5 and Comparative Example 7, it can be seen that when only VTB is included, the dynamic shear after PAV aging, the bending creep stiffness, and the bending creep slope do not satisfy the quality standards. Comparing Examples 1 to 5 and Comparative Example 6, it can be seen that when only vacuum residue oil is included, the dynamic shear after PAV aging and the bending creep slope do not satisfy the quality standards. In addition, when comparing Examples 1, 2, and 5 and Comparative Examples 4 and 5, it can be seen that when using a softening additive compared to using HVGO when exhibiting an equivalent level of penetration grade, the improvement effect on dynamic shear after RTFO aging and flexural creep gradient after PAV aging is better even with a smaller amount.

[0073] <Experimental Example 3> Evaluation of elongation after thin film heating

[0074] The evaluation of elongation after thin-film heating is a method of evaluating the decrease in elongation by conducting tensile tests based on changes in asphalt viscosity after short-term aging, after exposing asphalt to artificial deterioration conditions. For asphalt exported to some countries, the elongation after thin-film heating is required to be 40 cm or more.

[0075] The quality standards, test methods, and measurement results for Examples 1 to 5 and Comparative Examples 1 to 9 for the evaluation of elongation after thin film heating are shown in Tables 13 to 16 below.

[0076] Test Item Test Method Quality Standard Example 1 Example 2 Example 3 Elongation after thin film heating (15℃, cm) KS M 220140 or higher 78103102

[0077] Test Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Elongation after thin film heating (15℃, cm) 154 113 19 45 140

[0078] Test Item Test Method Quality Standard Example 4 Example 5 Elongation after thin film heating (15℃, cm) KS M 220140 or higher 5587

[0079] Test Item Comparative Example 8 Comparative Example 9 Elongation of thin film after heating (15℃, cm) 2310

[0080] As shown in Tables 13 to 16 above, Examples 1 to 5 showed an elongation of 40 or higher after thin-film heating, whereas Comparative Examples 1, 3, 4, and 6 to 9 showed an elongation of less than 40 after thin-film heating, indicating that they did not satisfy the quality standards for asphalt for export. When comparing Examples 1 to 5 with Comparative Examples 1, 3, 4, and 6 to 9, it can be seen that the quality standards for asphalt for export regarding elongation after thin-film heating are not satisfied when a high content of VTB is applied, when a small amount of softening additive is applied, when heavy vacuum diesel oil is used instead of the softening additive, when only VTB is included, or when only vacuum residue oil is included. Furthermore, when comparing Examples 1, 2, and 5 with Comparative Examples 4 and 5, it can be seen that when exhibiting an equivalent level of penetration grade, using a softening additive results in a better improvement effect on elongation after thin-film heating with a smaller amount compared to using HVGO. When comparing Examples 2 and 5 and Examples 3 and 4 at the same VTB content, it was found that as the rosin content increased, the amount of softening additive used to achieve an equivalent penetration grade increased, and the improvement effect on elongation after thin film heating was better when the amount of softening additive increased. In other words, it was confirmed that the usable range of the softening additive can be expanded by adjusting the rosin content.

[0081] Although an embodiment of the present invention has been described above, those skilled in the art may modify and change the present invention in various ways by adding, changing, deleting, or adding components, etc., without departing from the spirit of the present invention as described in the claims, and such modifications and changes are also to be included within the scope of the rights of the present invention.

Claims

1. An asphalt mixture comprising vacuum residue and VTB (Vacuum Tower Bottom); and Containing a softening additive derived from plant-based raw materials, Bioasphalt composition.

2. In Paragraph 1, A bioasphal composition comprising 5 to 25 parts by weight of the VTB based on 100 parts by weight of the bioasphal composition.

3. In Paragraph 1, A bioasphal composition comprising 2.6 to 4.5 parts by weight of the softening additive based on 100 parts by weight of the bioasphal composition.

4. In Paragraph 1, The above-mentioned softening additive comprises one or more of rosin, palm oil, and soybean oil, forming a bioasphalt composition.

5. In Paragraph 1, A bioasphalt composition comprising 15 to 30 parts by weight of rosin and 70 to 85 parts by weight of palm oil, based on 100 parts by weight of the above-mentioned softening additive.

6. In Paragraph 1, Bioasphalt composition not containing heavy vacuum oil.

7. (S1) A step of obtaining a heated asphalt mixture by heating an asphalt mixture comprising vacuum residue and VTB (Vacuum Tower Bottom) until it reaches 130 to 160 ℃; and (S2) a step of injecting a softening additive derived from a plant material into the heated asphalt mixture and mixing for 5 to 60 minutes; a method for manufacturing a bioasphalt composition.

8. In Paragraph 7, A method for manufacturing a bioasphal composition comprising 5 to 25 parts by weight of the VTB based on 100 parts by weight of the bioasphal composition.

9. In Paragraph 7, A method for manufacturing a bioasphal composition comprising 2.6 to 4.5 parts by weight of the softening additive based on 100 parts by weight of the bioasphalt.

10. In Paragraph 7, A method for preparing a bioasphalt composition, wherein the above-mentioned softening additive comprises one or more of rosin, palm oil, and soybean oil.

11. In Paragraph 7, A method for manufacturing a bioasphalt composition comprising 15 to 30 parts by weight of rosin and 70 to 85 parts by weight of palm oil, based on 100 parts by weight of the above-mentioned softening additive.

12. In Paragraph 7, A method for manufacturing a bioasphalt composition in which the above asphalt mixture does not contain heavy vacuum oil.