CN114921106B - Direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles and preparation method thereof - Google Patents
Direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles and preparation method thereof Download PDFInfo
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Abstract
The invention provides a direct-casting type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particle and a preparation method thereof. The invention relates to direct-casting type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles, which comprise the following components in percentage by mass: carbon black: 30% -60% of matrix asphalt: 10% -30%, elasticizer: 15% -25%, plasticizer: 5% -8% of lake asphalt: 2% -15% of pyrolysis oil: 1 to 5 percent. According to the invention, the materials are prepared into particles through granulating equipment after being hot mixed, and the obtained particles are mixed with asphalt mixture to improve the road performance. The invention can be used for quickly repairing newly-built and newly-built asphalt roads and pavements, and the related preparation and construction methods are simpler, environment-friendly, low in energy consumption and suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a direct-casting type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particle and a preparation method thereof.
Background
The waste tires have the problems of large production amount, serious pollution, difficult treatment and the like, and the traditional method for treating the waste tires has the defects of low resource utilization efficiency, secondary pollution and the like. The pyrolysis treatment is an effective method for realizing innocent treatment and 100% recycling of the waste tires, and the recycling products mainly comprise pyrolysis carbon black, pyrolysis oil, pyrolysis gas and steel. At present, the problem of surplus productivity exists in the pyrolysis carbon black and the pyrolysis oil, and the pyrolysis carbon black and the pyrolysis oil are applied to asphalt mixtures, so that a new application way is provided for the resource utilization of the pyrolysis carbon black and the pyrolysis oil, and the development of the tire pyrolysis industry can be promoted. However, in the practical use process, the pyrolytic carbon black still has technical and construction performance defects as a modifier for asphalt and asphalt mixtures. In terms of technical performance: carbon black can improve the high-temperature rutting resistance of asphalt mixtures due to filler hardening effect, but the low-temperature cracking resistance of carbon black modified asphalt mixtures is reduced. In terms of working performance: the carbon black is in the micron range, the construction process is difficult to disperse uniformly, agglomerates are formed in the asphalt mixture, and the modification effect cannot be well exerted.
In order to solve the problems of the technology and construction, the patent proposes to compound the carbon black, the low-dosage asphalt and the asphalt functional modifier, and the pre-dispersion of the carbon black and the modifier is realized by adopting an indoor mixing process. And then the modified particles of the direct-throwing type pyrolytic carbon black and pyrolytic oil functional asphalt mixture are prepared by an extrusion granulation technology, so that the agglomeration problem of the carbon black in actual engineering is solved. The variety and the blending amount of the modifier of the carbon black modified particles are adjusted, so that different modification functions of the carbon black modified particles are endowed, such as the high-temperature stability, the low-temperature crack resistance and the water loss resistance of the asphalt mixture are pertinently improved. The carbon black modified particles can be made into different shapes, such as particles, sheets, strips and the like, so that the construction requirements of asphalt mixtures are met, and the convenience of transportation and storage is realized.
Disclosure of Invention
The invention aims to provide modified particles of direct-throwing type pyrolytic carbon black and pyrolytic oil functional asphalt mixture, and the proportion, shape, mixing amount and the like of the modified particles can be adjusted according to the needs in the actual use process, and the modified particles are doped into asphalt mixture to realize certain properties including high-temperature stability, low-temperature crack resistance, rut resistance and the like.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 30% -60% of matrix asphalt: 10% -30%, elasticizer: 15% -25%, plasticizer: 5% -8% of lake asphalt: 2% -15% of pyrolysis oil: 1 to 5 percent.
Optionally, the carbon black comprises one of scrap tire pyrolysis carbon black, commercial carbon black, pigment carbon black, reinforcing carbon black; the carbon black has a mesh number of 40-80 mesh and a pour density of 0.3g/cm 3 ～0.5g/cm 3 Between them.
Optionally, the matrix asphalt is one of 70#, 90#, 110# road petroleum asphalt of each grade.
Optionally, the elasticizer is one of a styrene-butadiene-styrene block copolymer and a polyethylene thermoplastic resin.
Optionally, the plasticizer is one of dioctyl phthalate and dibutyl phthalate.
Optionally, the Lake Asphalt (TLA) is a natural lake asphalt of telithida; the penetration of the lake asphalt at 25 ℃ is less than 5dmm, the softening point of the cycloball method is not less than 90 ℃, the ash content is 33-38%, and the density at 25 ℃ is 1.3g/cm 3 ～1.5g/cm 3 The penetration ratio of the residue after TFOF at 25 ℃ is not less than 50%.
Optionally, the pyrolysis oil is waste tire pyrolysis oil, and the pyrolysis oil has a density of 0.5g/cm at 25 DEG C 3 ～1.2g/cm 3 A kinematic viscosity of 1.2mm 2 /s～5.7mm 2 /s。
The second object of the present invention is to provide a method for preparing the modified particles of the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture, which comprises the following steps:
1) After the carbon black and the elasticizer are mixed uniformly by dry stirring, adding the mixture into a 1-zone heating device with the temperature of 130-190 ℃ for 3-5 hours so as to completely blend;
2) Respectively adding the matrix asphalt and the lake asphalt into a region 2 with the temperature of 130-190 ℃ and a region 3 with the temperature of 130-190 ℃ in granulating equipment, and heating to a molten state;
3) Adding the raw materials in the molten state obtained in the step 1) and the step 2) and the plasticizer into a 4-zone with the temperature of 160-200 ℃ in granulating equipment, and mixing and stirring for 3-5 min to uniformly mix the materials;
4) And 3) adding the molten carbon black mixture obtained in the step 3) into a head area with the temperature of 120-150 ℃ in granulating equipment, adding the pyrolysis oil into a head manufacturing area in the plasticizing stage of the molten carbon black mixture, mixing with the molten carbon black mixture, and granulating through the extrusion action of the head area to obtain the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles.
Compared with the prior art, the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles have the following advantages:
1. according to the invention, the carbon black, SBS, TLA and other materials are prepared into the modifier of the granular asphalt mixture, so that the problems that a large amount of carbon black is directly added into an asphalt mixture mixing plant, and the carbon black is easy to agglomerate and difficult to disperse, so that the carbon black and the asphalt mixture can be fully mixed, the high temperature performance of the asphalt mixture is effectively improved, the temperature sensitivity of the asphalt mixture is reduced, and the addition of SBS/PE, DOP/DBP and the like in particles can improve the high temperature stability and the low temperature crack resistance of the asphalt mixture.
2. The invention not only realizes the reutilization of the waste of the carbon black and the waste Tire Pyrolysis Oil (TPO) in the waste tire, but also reduces the consumption of aggregate and asphalt, realizes the utilization of solid waste by open source throttling, responds to the national energy conservation and emission reduction call, reduces the environmental pollution and emission, and in actual use, the road performances such as the high-temperature stability, the low-temperature crack resistance, the rutting resistance and the like of the asphalt mixture can be obviously improved by doping the prepared modified particles into the asphalt mixture, so that the road performance of the asphalt mixture is effectively improved, and the recycling of the solid waste is realized.
3. The invention ensures that the carbon black is added into the asphalt mixture in the form of particles, thereby not only solving the problems of easy agglomeration and difficult dispersion of the carbon black and improving the modification effect, but also solving the dust raising problem on the construction site, increasing the workability of construction and providing an effective way for reasonably utilizing the waste tire carbon black.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The granulating equipment used in the invention is an extrusion type granulator or an extrusion type granulator, the granulator is divided into four zones and a machine head part, the heating temperature of the heating zone is 130-190 ℃ in the 1-3 zones, the temperature of the mixing zone is 160-200 ℃ in the 4 zones, and the temperature of the machine head part is 120-150 ℃ in the granulating zone.
The present invention will be described in detail with reference to examples.
In each embodiment of the invention, the asphalt mixture is selected from AC-13 grading and has an oil-stone ratio of 48%; the carbon black adopted is waste tire pyrolysis carbon black, the mesh number is between 40 and 80 meshes, and the pour density is 0.4g/cm 3 Between them; the adopted asphalt is 70# road petroleum asphalt; the adopted elasticizer is a styrene-butadiene-styrene block copolymer (SBS: SBS 1201); the plasticizer is colorless liquid dioctyl phthalate (DOP); the adopted lake asphalt is Trinida natural lake asphalt, the penetration degree of the lake asphalt at 25 ℃ is 5dmm, the softening point of the lake asphalt by a ring and ball method is 105.6 ℃, the ash content is 35%, and the density at 25 ℃ is 1.4g/cm 3 The penetration ratio of the residue after TFOF at 25 ℃ is 61%; the pyrolysis oil is waste Tire Pyrolysis Oil (TPO) with the density of 0.887g/cm at 25 DEG C 3 A kinematic viscosity of 2.3mm 2 S; the aggregate is limestone with 0-5 mm, 5-10 mm and 10-15 mm, and the AC13 grading is prepared; the mineral powder is obtained by crushing limestone.
Example 1
The direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 46%,70# base asphalt: 20%, SBS:15%, DOP:8%, lake asphalt: 9%, pyrolysis oil: 2%.
The preparation method of the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles specifically comprises the following steps:
(1) Uniformly mixing carbon black and SBS (styrene-butadiene-styrene) in a dry mixing manner, adding the mixture into a 135 ℃ oven of a 1 region of a granulating device to completely blend the mixture, heating the mixture for 3 to 5 hours, adding 70# matrix asphalt and lake asphalt into a 140 ℃ 2 region and a 185 ℃ 3 region of the granulating device respectively to be heated to a molten state, adding the raw materials in the molten state and DOP into a 150 ℃ 4 region of the granulating device according to the grading, mixing and stirring the raw materials uniformly, and stirring the raw materials for 3 to 5 minutes to obtain a molten carbon black mixture;
(2) And adding the molten carbon black mixture into a head area with the temperature of 135 ℃ in a granulating device, adding pyrolysis oil into the head area of the granulating device in the plasticizing stage of the molten carbon black mixture, mixing with the molten carbon black mixture, and granulating by virtue of the extrusion action of the head area, thereby obtaining the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles.
Preparing an asphalt mixture: a first group: preparing an asphalt mixture: according to the test method of JTG T0702-2011, fully dried aggregate and mineral powder which is additionally contained in a small basin are placed in a baking oven at about 163 ℃ for heating, matrix asphalt is placed in a baking oven at 140 ℃, and an asphalt mixture mixer is started at the same time, so that the mixture is preheated to about 150 ℃. Setting the mixing temperature of the mixer to 140 ℃ after heating, pouring the aggregate into the mixer to mix for 60s, pouring matrix asphalt with corresponding mass according to the ratio of the oil to the stone to mix for 60s, adding hot mineral powder to mix for 60s until the mixture is completely and uniformly mixed, and taking the total mixing time to be about 3min. Pouring out asphalt mixture after mixing, subpackaging according to the amount of mixture required by each test piece in the subsequent test, and putting into an oven for heating and preserving heat for later use.
Second group: according to the test method of JTG T0702-2011, fully dried aggregate and mineral powder which is additionally contained in a small basin are placed in a baking oven at about 163 ℃ for heating, matrix asphalt is placed in a baking oven at 140 ℃, and an asphalt mixture mixer is started at the same time, so that the mixture is preheated to about 150 ℃. Setting the mixing temperature of a mixer to 140 ℃ after heating, pouring aggregate into the mixer, mixing for 60s, pouring matrix asphalt with corresponding mass according to the proportion of oil and stone, mixing for 60s, adding hot mineral powder, mixing for 60s, adding direct-casting pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles with 34% of the mass of the matrix asphalt, and mixing completely and uniformly for about 3min. Pouring out asphalt mixture after mixing, subpackaging according to the amount of mixture required by each test piece in the subsequent test, and putting into an oven for heating and preserving heat for later use.
Different test pieces were made according to the test requirements as follows:
(1) Each group was prepared as standard rut board test pieces 300mm long by 300mm wide by 50mm thick for high temperature rut resistance test.
(2) 8 standard Marshall test pieces were prepared for each group, and a total of 16 standard Marshall test pieces were used for Marshall stability test.
(3) 4 standard Marshall test pieces were prepared for each group, and a total of 8 standard Marshall test pieces were used for freeze-thaw cleavage experiments.
(4) 2 matrix standard Marshall test pieces are prepared for each group, 2 modified particle Marshall test pieces of the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture are cut into semicircle shapes and left for standby.
In the first group and the second group, except for the modified particles of the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture which are doped in the second group, other steps and doping materials are completely consistent, so that the accuracy of the test is ensured. The asphalt mixture obtained in this example was tested for road performance as follows:
(1) High temperature rut resistance test: the dynamic stability of the 70# matrix asphalt mixture is 1531 times/mm and is more than 800 times/mm required by the specification; when 34% of direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are doped, the dynamic stability of the asphalt mixture reaches 3977 times/mm, and compared with matrix asphalt, the rutting resistance of the asphalt mixture is improved by 259.76%, which shows that the high-temperature performance of the mixture is obviously improved when the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are added, and the test results are shown in table 1.
Table 1 asphalt mixture rut test results
(2) Marshall stability test: the mechanical properties of the asphalt mixture are tested by adopting a Marshall stability test, and the test results are shown in table 2, which show that the mechanical properties of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles are superior to those of the common asphalt mixture.
TABLE 2 Marshall stability test results
| Test piece numbering | Stability (kN) | Flow value (mm) | Marshall modulus |
| Substrate 1 | 9.22 | 3.1 | 2.97 |
| Substrate 2 | 9.17 | 3.2 | 2.87 |
| Substrate 3 | 9.23 | 2.9 | 3.18 |
| Matrix 4 | 9.26 | 3.2 | 2.89 |
| Modified particle 1 | 14.5 | 3.6 | 4.02 |
| Doping modified particle 2 | 14.8 | 2.8 | 5.29 |
| Doping modified particles 3 | 14.7 | 3.1 | 4.74 |
| Doping modified particles 4 | 14.4 | 2.9 | 4.97 |
(3) The freeze thawing cleavage test data of the asphalt mixture are shown in Table 3, and the freeze thawing cleavage test strength ratio of the matrix asphalt mixture is 84.3%, and the freeze thawing cleavage strength ratio of the matrix asphalt mixture after the modified particles of the direct-injection pyrolytic carbon black and the pyrolytic oil functional asphalt mixture are doped reaches 92.8%, which is far higher than the standard requirement.
Table 3 data of asphalt mixture freeze thawing split experiments
(4) Semicircle bending test:
the test results are shown in Table 4, the breaking energy of the matrix asphalt mixture is 1193.45J/M 2 The fracture energy after being doped into the particles reaches 1626.17J/M 2 The low-temperature performance of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture modified particles is superior to that of the matrix asphalt mixture.
TABLE 4 semicircle bend test data
| Test piece parameters | Substrate | 34% modified particles |
| Energy of rupture (J/M) 2 ) | 1193.45 | 1626.17 |
Example 2
The direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 40%,70# matrix asphalt: 20%, SBS:21%, DOP:8%, lake asphalt: 8%, pyrolysis oil: 2%. When preparing the asphalt mixture, the mixing amount of the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is still 34%, at this time, the 70# matrix asphalt mixture is not prepared, only the asphalt mixture doped with the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is prepared, the preparation steps of the modified particles are the same as in example 1, and other preparation steps of the asphalt mixture are the same as in example 1.
Different test pieces were made according to the test requirements as follows:
(1) Standard rut board test pieces, 300mm long by 300mm wide by 50mm thick, were prepared for high temperature rut resistance tests.
(2) 4 standard Marshall test pieces were prepared for Marshall stability test.
(3) 4 standard Marshall test pieces were prepared for freeze-thaw cleavage experiments.
(4) 2 modified particle Marshall test pieces of the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture are prepared, cut into semicircular shapes and left for standby.
The asphalt mixture obtained in this example was tested for road performance as follows:
(1) When 34% of direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are doped, the dynamic stability of the asphalt mixture reaches 5224 times/mm, and compared with matrix asphalt, the rutting resistance of the asphalt mixture is improved by 342.21%, which shows that the high-temperature performance of the mixture is obviously improved when the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are added, and the data are shown in Table 5.
Table 5 high temperature rut resistance test data
| Test index | Incorporation of 34% modified particles |
| Average dynamic stability (times/mm) | 5224 |
| Specification requirements | 70# matrix asphalt>800 |
(2) Marshall stability test: the mechanical properties of the asphalt mixture are tested by adopting a Marshall stability test, and the test results are shown in Table 6, which show that the mechanical properties of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles are superior to those of the common asphalt mixture.
TABLE 6 Marshall stability test of asphalt mixtures
| Test piece numbering | Stability (kN) | Flow value (mm) | Marshall modulus |
| 1 | 15.6 | 3.5 | 4.46 |
| 2 | 15.7 | 3.6 | 4.36 |
| 3 | 15.2 | 3.2 | 4.75 |
| 4 | 15.4 | 3.3 | 4.67 |
(3) The data of the freeze thawing cleavage test of the asphalt mixture are shown in Table 7, and the freeze thawing cleavage strength ratio of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles reaches 92.7 percent and is far higher than the standard requirement.
Table 7 asphalt mixture freeze thawing split experimental data
(4) Semicircle bending test:
the test results are shown in Table 8, and the incorporation of direct-injection pyrolytic carbon black and pyrolytic oil workThe breaking energy of the modified particles of the energy-type asphalt mixture reaches 1581.11J/M 2 The low-temperature performance of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture modified particles is superior to that of the matrix asphalt mixture.
TABLE 8 semicircle bend test data
| Test piece parameters | 34% modified particles |
| Energy of rupture (J/M) 2 ) | 1581.11 |
Example 3
The direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 45%,70# base asphalt: 20%, SBS:15%, DOP:5%, lake asphalt: 13%, pyrolysis oil: 2%. When preparing the asphalt mixture, the mixing amount of the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is still 34%, and the asphalt mixture mixed with the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is prepared, wherein the preparation steps of the modified particles are the same as those of the embodiment 1, and other preparation steps of the asphalt mixture are the same as those of the embodiment 1.
Different test pieces were made according to the test requirements as follows:
(1) Standard rut board test pieces, 300mm long by 300mm wide by 50mm thick, were prepared for high temperature rut resistance tests.
(2) 4 standard Marshall test pieces were prepared for Marshall stability test.
(3) 4 standard Marshall test pieces were prepared for freeze-thaw cleavage experiments.
(4) 2 modified particle Marshall test pieces of the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture are prepared, cut into semicircular shapes and left for standby.
The asphalt mixture obtained in this example was tested for road performance as follows.
(1) The dynamic stability of the asphalt mixture reaches 4576 times/mm when 34% of direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are doped, and compared with matrix asphalt, the rutting resistance of the asphalt mixture is improved by 298.89%, which shows that the high-temperature performance of the mixture is obviously improved when the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are added, and the data are shown in Table 9.
Table 9 high temperature rut resistance test data
| Test index | Incorporation of 34% modified particles |
| Average dynamic stability (times/mm) | 4576 |
| Specification requirements (times/mm) | 70# matrix asphalt>800 |
(2) Marshall stability test: the mechanical properties of the asphalt mixture are tested by adopting a Marshall stability test, and the test results are shown in Table 10, which show that the mechanical properties of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles are better than those of the common asphalt mixture.
Table 10 Marshall stability test of asphalt mixtures
| Test piece numbering | Stability (kN) | Flow value (mm) | Marshall modulus |
| 1 | 13.6 | 3.5 | 3.89 |
| 2 | 13.5 | 3.5 | 3.86 |
| 3 | 13.2 | 3.2 | 4.13 |
| 4 | 13.3 | 3.1 | 4.30 |
(3) The data of the freeze thawing cleavage test of the asphalt mixture are shown in Table 11, and the freeze thawing cleavage strength ratio of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles reaches 91.2 percent and is far higher than the standard requirement.
Table 11 data of asphalt mixture freeze thawing split experiments
(4) Semicircle bending test:
the test results are shown in Table 12, and the fracture energy after incorporation of the particles reaches 1457.99J/M 2 The low-temperature performance of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture modified particles is superior to that of the matrix asphalt mixture.
Table 12 semicircle bend test data
| Test piece parameters | 34% modified particles |
| Energy of rupture (J/M) 2 ) | 1457.99 |
Example 4
The direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 55%,70# base asphalt: 22%, SBS:15%, DOP:5%, lake asphalt: 2%, pyrolysis oil: 1%. When preparing the asphalt mixture, the mixing amount of the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is still 34%, and the asphalt mixture mixed with the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is prepared, wherein the preparation steps of the modified particles are the same as those of the embodiment 1, and other preparation steps of the asphalt mixture are the same as those of the embodiment 1.
Different test pieces were made according to the test requirements as follows:
(1) Standard rut board test pieces, 300mm long by 300mm wide by 50mm thick, were prepared for high temperature rut resistance tests.
(2) 4 standard Marshall test pieces were prepared for Marshall stability test.
(3) 4 standard Marshall test pieces were prepared for freeze-thaw cleavage experiments.
(4) 2 Marshall test pieces doped with direct-throwing type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are prepared, cut into semicircular shapes and left for standby.
The asphalt mixture obtained in this example was tested for road performance as follows.
(1) When 34% of direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are doped, the dynamic stability of the asphalt mixture reaches 4825 times/mm, and compared with matrix asphalt, the rutting resistance of the asphalt mixture is improved by 314.83%, which shows that the high-temperature performance of the mixture is obviously improved when the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are added, and the data are shown in Table 13.
Table 13 high temperature rut resistance test data
(2) Marshall stability test: the mechanical properties of the asphalt mixture are tested by adopting a Marshall stability test, and the test results are shown in Table 14, which show that the mechanical properties of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles are superior to those of the common asphalt mixture.
Table 14 marshall stability test of asphalt mixtures
| Test piece numbering | Stability (kN) | Flow value (mm) | Marshall modulus |
| 1 | 13.2 | 3.24 | 4.13 |
| 2 | 13.7 | 3.4 | 4.03 |
| 3 | 14.1 | 3.7 | 3.81 |
| 4 | 13.7 | 3.4 | 4.03 |
(3) The data of the freeze thawing and splitting test of the asphalt mixture are shown in Table 3, and the freeze thawing and splitting strength ratio of the asphalt mixture doped with the direct-casting pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles reaches 91.1 percent and is far higher than the standard requirement.
Table 15 data of asphalt mixture freeze thawing split experiments
(4) Semicircle bending test:
the test results are shown in Table 16, and the breaking energy of the modified particles of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolytic oil reaches 1575.61J/M 2 The low-temperature performance of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture modified particles is superior to that of the matrix asphalt mixture.
TABLE 16 semicircle bend test data
| Test piece parameters | 34% modified particles |
| Energy of rupture (J/M) 2 ) | 1575.61 |
Example 5
The direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles comprise the following components in percentage by mass: carbon black: 30%, 70# matrix asphalt: 20%, SBS:25%, DOP:5% of lake asphalt: 15%, pyrolysis oil: 5%. When preparing the asphalt mixture, the mixing amount of the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is still 34%, and the asphalt mixture mixed with the modified particles of the direct-injection type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture is prepared, wherein the preparation steps of the modified particles are the same as those of the embodiment 1, and other preparation steps of the asphalt mixture are the same as those of the embodiment 1.
Different test pieces were made according to the test requirements as follows:
(1) Standard rut board test pieces were prepared, the test pieces being 300mm long by 300mm wide by 50mm thick. The method is used for high-temperature rut resistance tests.
(2) 4 standard Marshall test pieces were prepared for Marshall stability test.
(3) 4 standard Marshall test pieces were prepared for freeze-thaw cleavage experiments.
(4) 2 modified particle Marshall test pieces of the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture are prepared, cut into semicircular shapes and left for standby.
The asphalt mixture obtained in this example was tested for road performance as follows:
(1) When 34% of direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are doped, the dynamic stability of the asphalt mixture reaches 5818 times/mm, and compared with matrix asphalt, the rutting resistance of the asphalt mixture is improved by 380.01%, which shows that the high-temperature performance of the mixture is obviously improved when the direct-injection type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are added, and the data are shown in Table 17.
Table 17 high temperature rut resistance test data
| Test index | Incorporation of 34% modified particles |
| Average dynamic stability (times/mm) | 5818 |
| Specification requirements (times/mm) | 70# matrix asphalt>800 |
(2) Marshall stability test: the mechanical properties of the asphalt mixture are tested by adopting a Marshall stability test, and the test is shown in table 18, which shows that the mechanical properties of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the modified particles of the pyrolytic oil functional asphalt mixture are superior to those of the common asphalt mixture.
Table 18 Marshall stability test of asphalt mixtures
| Test piece numbering | Stability (kN) | Flow value (mm) | Marshall modulus |
| 1 | 17.6 | 3.0 | 5.87 |
| 2 | 16.8 | 3.5 | 4.80 |
| 3 | 17.4 | 3.6 | 4.83 |
| 4 | 17.2 | 3.5 | 4.91 |
(3) The data of the freeze thawing and splitting test of the asphalt mixture are shown in Table 19, and the freeze thawing and splitting strength ratio of the asphalt mixture doped with the direct-casting pyrolytic carbon black and the pyrolysis oil functional asphalt mixture modified particles reaches 94.4 percent and is far higher than the standard requirement.
Table 19 asphalt mixture freeze thawing split experimental data
(4) Semicircle bending test:
the test results are shown in Table 20, and the breaking energy of the modified particles of the asphalt mixture doped with the direct-injection type pyrolytic carbon black and the pyrolytic oil reaches 1598.23J/M 2 The low-temperature performance of the asphalt mixture doped with the direct-casting type pyrolytic carbon black and the pyrolytic oil functional asphalt mixture modified particles is superior to that of the matrix asphalt mixture.
TABLE 20 semicircle bend test data
| Test piece parameters | 34% modified particles |
| Energy of rupture (J/M) 2 ) | 1598.23 |
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The direct-throwing type pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles are characterized by comprising the following components in percentage by mass: carbon black: 30% -60% of matrix asphalt: 10% -30%, elasticizer: 15% -25%, plasticizer: 5% -8% of lake asphalt: 2% -15% of pyrolysis oil: 1 to 5 percent;
the elasticizer is one of styrene-butadiene-styrene block copolymer and polyethylene thermoplastic resin; the plasticizer is one of dioctyl phthalate and dibutyl phthalate;
the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles are prepared by the following method:
1) After the carbon black and the elasticizer are mixed uniformly by dry stirring, adding the mixture into a 1-zone heating device with the temperature of 130-190 ℃ for 3-5 hours so as to completely blend;
2) Respectively adding the matrix asphalt and the lake asphalt into a region 2 with the temperature of 130-190 ℃ and a region 3 with the temperature of 130-190 ℃ in granulating equipment, and heating to a molten state;
3) Adding the raw materials in the molten state obtained in the step 1) and the step 2) and the plasticizer into a 4-zone with the temperature of 160-200 ℃ in granulating equipment, and mixing and stirring for 3-5 min to uniformly mix the materials;
4) And 3) adding the molten carbon black mixture obtained in the step 3) into a head area with the temperature of 120-150 ℃ in granulating equipment, adding the pyrolysis oil into a head manufacturing area in the plasticizing stage of the molten carbon black mixture, mixing with the molten carbon black mixture, and granulating through the extrusion action of the head area to obtain the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles.
2. The direct-fed pyrolytic carbon black and pyrolysis oil functional asphalt mixture modified particles according to claim 1, wherein the carbon black comprises one of scrap tire pyrolytic carbon black, commercial carbon black, pigment carbon black, reinforcing carbon black; the carbon black has a mesh number of 40-80 mesh and a pour density of 0.3g/cm 3 ～0.5g/cm 3 Between them.
3. The modified particles of direct-fed pyrolytic carbon black and pyrolytic oil functional asphalt mixture according to claim 1, wherein the matrix asphalt is one of 70#, 90#, 110# road petroleum asphalt grades.
4. The direct-fed pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles according to claim 1, wherein the lake asphalt is a natural lake asphalt of telitha; the penetration degree of the lake asphalt at 25 ℃ is 0-5 dmm, the softening point of the asphalt by a ring and ball method is not less than 90 ℃, the ash content is 33-38%, and the density at 25 ℃ is 1.3g/cm 3 ～1.5g/cm 3 The penetration ratio of the residue after TFOF at 25 ℃ is not less than 50%.
5. The modified particles of direct-fed pyrolytic carbon black and pyrolytic oil functional asphalt mixture according to claim 1, wherein the pyrolytic oil is waste tire pyrolytic oil, and the pyrolytic oil has a density of 0.5g/cm at 25 °c 3 ～1.2g/cm 3 A kinematic viscosity of 1.2mm 2 /s～5.7mm 2 /s。
6. A method for preparing the direct-fed pyrolytic carbon black and pyrolytic oil functional asphalt mixture modified particles according to any one of claims 1 to 5, comprising the steps of:
1) After the carbon black and the elasticizer are mixed uniformly by dry stirring, adding the mixture into a 1-zone heating device with the temperature of 130-190 ℃ for 3-5 hours so as to completely blend;
2) Respectively adding the matrix asphalt and the lake asphalt into a region 2 with the temperature of 130-190 ℃ and a region 3 with the temperature of 130-190 ℃ in granulating equipment, and heating to a molten state;
3) Adding the raw materials in the molten state obtained in the step 1) and the step 2) and the plasticizer into a 4-zone with the temperature of 160-200 ℃ in granulating equipment, and mixing and stirring for 3-5 min to uniformly mix the materials;
4) And 3) adding the molten carbon black mixture obtained in the step 3) into a head area with the temperature of 120-150 ℃ in granulating equipment, adding the pyrolysis oil into a head manufacturing area in the plasticizing stage of the molten carbon black mixture, mixing with the molten carbon black mixture, and granulating through the extrusion action of the head area to obtain the direct-throwing type pyrolysis carbon black and pyrolysis oil functional asphalt mixture modified particles.
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