CN109777134B - High-modulus warm mix asphalt additive and preparation method and application thereof - Google Patents
High-modulus warm mix asphalt additive and preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the field of traffic engineering additives, and relates to a preparation method and application of a high-modulus warm-mixed asphalt additive. The additive is prepared by taking a high-modulus warm-mixing main agent, a thermoplastic elastomer, vegetable oil, a cross-linking agent, a coupling agent, an antioxidant, an anti-aging agent and tackifying resin as main raw materials and performing single-screw low-temperature extrusion granulation. The high-modulus warm-mixing additive prepared by the invention can be directly thrown into a mixture, and is suitable for high-modulus asphalt pavement engineering with higher environmental protection requirements and low-temperature construction environment in winter; the asphalt mixture prepared by the high-modulus warm-mix asphalt additive has the characteristics of outstanding high-temperature performance, high dynamic modulus, good low-temperature toughness, excellent water damage resistance and the like, can reduce the construction temperature of mixing, paving, rolling and the like of the mixture by 20-30 ℃, realizes a warm-mix effect, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the field of traffic engineering additives, and particularly relates to a high-modulus warm mix asphalt additive, and a preparation method and application thereof.
Background
In recent years, with the rapid development of national economy and the continuous expansion of highway construction scale, the problems of vehicle overload and heavy-duty vehicles increase, so that the damage of asphalt pavements is increasingly serious. The high-modulus asphalt pavement technology is different from the traditional technology of adding an anti-rutting agent to improve the anti-rutting capability of a pavement, and starts from the overall structure design of the pavement, and achieves good engineering and economic benefits by improving the comprehensive requirements of materials and reducing the thickness of the pavement.
The high modulus asphalt pavement technology originated in France of the last century and has made clear requirements on the dynamic modulus of asphalt mixture at 15 ℃ and 10 Hz. High modulus technology is introduced from 2001 in China, continuous technical progress is obtained in the aspects of materials, construction technology and technical indexes through continuous groping research, and the requirement that the high-temperature dynamic modulus of 45 ℃ and 10Hz is more than 2000MPa is provided according to the climate characteristics of China, wherein the high-temperature modulus can reflect the use temperature of a pavement and reflect the contribution of the modulus improvement to the pavement structure. The high-modulus asphalt pavement has outstanding comprehensive performances such as excellent anti-rutting performance, water loss resistance, fatigue resistance and the like, and has wide application prospect in special road sections such as expressways, long and large longitudinal slopes, road intersections, bridge deck pavement and the like. However, with the complexity of engineering environment, in areas with high requirements on environmental protection and safety, such as municipal administration and tunnels, the problem of asphalt fuming needs to be solved; in a low-temperature construction environment in winter, a normal high-modulus asphalt pavement is difficult to pave and compact, so that a special engineering application environment puts higher requirements on a high-modulus warm-mixing technology.
At present, the high modulus asphalt pavement and the warm mix asphalt technology are mainly realized by an asphalt modifier. Chinese patent CN103102707B discloses a high modulus asphalt modifier, which is prepared by blending and granulating waste plastics, although the cost is lower and the preparation method is simple; but lacks the relevant experiment and application performance evaluation of the asphalt mixture. CN104194366B discloses a low-temperature-resistant high-modulus asphalt modifier and a preparation method thereof, the problem of obvious difference of the blending processing process of waste plastics and rubber is solved through a cold processing process, and the prepared modifier has excellent high and low temperature performance; but the application is limited, and the low-temperature construction environment is difficult to adapt. CN102976649B discloses a warm mixing agent for waste rubber powder modified asphalt and a preparation method thereof, wherein the prepared warm mixing agent can obviously reduce the viscosity of the rubber powder modified asphalt and reduce the construction temperature; but the high-temperature performance of the modified asphalt is not greatly improved. CN107383907A discloses a warm-mix high-modulus asphalt modifier, a preparation method and application thereof, wherein a warm-mix high-modulus main agent is prepared by cracking polymer particles, and the prepared modifier still has excellent comprehensive performance on the premise of reducing the forming temperature by 30 ℃; however, the preparation of the medium-temperature-mixing high-modulus main agent in the patent has high requirements on equipment, the reaction temperature is high, and the reaction is difficult to control. In conclusion, although the modification technology can solve the problems of high modulus of asphalt or reduced construction temperature to a certain extent, it is difficult to simultaneously meet the requirements of high modulus, warm mixing and comprehensive service performance.
Disclosure of Invention
The invention mainly aims to provide a high-modulus warm-mix asphalt additive aiming at the defects in the prior art, the asphalt mixture modified by the additive has the advantages of outstanding high-temperature performance, high dynamic modulus, good low-temperature toughness, excellent water damage resistance and excellent comprehensive performance, and the designed preparation method is simple and is suitable for popularization and application.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high modulus warm mix asphalt additive comprises the following components in parts by weight:
preferably, the high-modulus warm-mixing main agent is prepared by mixing polyethylene powder with at least three of polyethylene wax, Fischer-Tropsch wax, ethylene bis stearamide, pentaerythritol stearate, oleamide and stearic acid monoglyceride, wherein the polyethylene powder accounts for 40-60% of the total mass of the high-modulus warm-mixing main agent.
Preferably, the thermoplastic elastomer is a mixture of linear SBS and star SBS, wherein the linear SBS accounts for 70-80% of the mass percentage.
Preferably, the tackifying resin is at least one of rosin resin, petroleum resin and terpene resin.
Preferably, the vegetable oil is epoxidized vegetable oil, and can be at least one of epoxidized soybean oil, epoxidized corn oil, epoxidized rapeseed oil and epoxidized peanut oil.
Preferably, the coupling agent is an aminosilane coupling agent, and at least one of a monoamino silane coupling agent, a bisamino silane coupling agent or a triamino silane coupling agent can be selected.
Preferably, the antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and/or tris (2, 4-di-tert-butyl) phenyl phosphite.
Preferably, the anti-aging agent is at least one of montmorillonite, nano-silica and diatomite.
Preferably, the cross-linking agent is sulfur.
The preparation method of the high-modulus warm mix asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil charge treatment, and standing to obtain an oil-charged thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, tackifying resin, coupling agent, antioxidant, anti-aging agent and crosslinking agent in a stirrer;
4) adding an oil-filled thermoplastic elastomer into the mixed powder obtained in the step 3), mixing in a stirrer, and then adding into a single-screw extruder for extrusion granulation to obtain the high-modulus warm mix asphalt additive.
In the scheme, the oil-filling treatment time in the step 2) is 1-3 h; standing for 4-8 h.
In the scheme, the temperature adopted for extrusion granulation is 40-100 ℃.
The invention also provides an application of the high-modulus warm-mix asphalt additive, and the modified asphalt mixture prepared by using the high-modulus warm-mix asphalt additive comprises the high-modulus warm-mix asphalt additive, SBS asphalt, aggregate and mineral powder, wherein the high-modulus warm-mix asphalt additive accounts for 0.2-0.4% by mass.
The preparation method of the modified asphalt mixture comprises the following steps:
mixing the high-modulus warm-mixed asphalt additive and the aggregate in a mixing pot at 160-180 ℃, adding SBS asphalt for continuous mixing, and finally adding mineral powder for stirring to obtain the modified asphalt mixture. Wherein the asphalt-stone ratio of the adopted AC20 asphalt mixture is fixed, and the high-modulus warm-mixed asphalt additive accounts for 0.2-0.4% of the total mass of the mixture; the heating temperature of the aggregate and the mineral powder is about 160-180 ℃, the heating temperature of the SBS asphalt is 160 ℃, and the mixing and discharging temperature is about 130-140 ℃.
And for the reference mixture without the additive (the aggregate is firstly mixed in a mixing pot, SBS asphalt is added for continuous mixing, and finally mineral powder is added for mixing to obtain the reference asphalt mixture, wherein the adopted asphalt-stone ratio of the AC20 asphalt mixture is fixed), the heating temperature of the aggregate and the mineral powder is 180 ℃, the SBS asphalt heating temperature is 160 ℃, and the mixing discharge temperature is about 160 ℃.
The high-modulus warm-mixed asphalt additive can reduce the construction temperature of mixing, paving, rolling and the like of a mixture by 20-30 ℃; the method is suitable for municipal engineering, tunnels and other construction projects with high requirements on environmental protection and low-temperature construction environments in winter.
The principle of the invention is as follows:
designing components: the invention takes high modulus warm mix main agent, thermoplastic elastomer, epoxy vegetable oil and mixed reaction auxiliary agent as main raw materials, and prepares the high modulus warm mix asphalt additive by single screw low temperature extrusion granulation: the polyethylene, polyethylene wax and other materials adopted have high softening points, and the formed high-modulus warm-mixing main agent is beneficial to improving the high-temperature performance and the dynamic modulus of the mixture; pentaerythritol stearate, Fischer-Tropsch wax and other low-melting-point substances can obviously reduce the viscosity of the asphalt, so that the mixing, paving and rolling temperature is 20-30 ℃ lower than the normal temperature; the high-temperature performance and the warm mixing effect can be effectively considered by adjusting the proportion of the high-melting point component and the low-melting point component; the adopted thermoplastic elastomer and the epoxy vegetable oil have excellent low-temperature performance, can exert a synergistic effect to obviously improve the low-temperature performance of the modified asphalt, and can be matched with the high-modulus warm-mixing main agent to give consideration to both the high-temperature performance and the low-temperature performance; in addition, part of epoxy groups on the epoxy vegetable oil can chemically react with amino groups on the amino silane coupling agent under the high-temperature condition of asphalt mixing, so that the high-efficiency adhesion of asphalt, a modifier and aggregate is realized, and the water loss resistance of the modified asphalt is further improved; the addition of anti-aging agents such as montmorillonite, nano silicon dioxide and the like can form an intercalated composite structure or nano modification on the asphalt, and can obviously improve the anti-aging performance of the asphalt; the introduction of the cross-linking agent can further improve the compatibility of the modifier and the asphalt and improve the high-low temperature comprehensive performance of the modified asphalt.
The process improvement comprises the following steps: the additive can fully absorb oil and swell by carrying out oil-charging treatment on the thermoplastic elastomer flocculent and the powder particles in advance, so that the compatibility with asphalt is improved; introducing a crosslinking system into the raw material system by adopting a low-temperature extrusion granulation process, thereby ensuring that the crosslinking is not carried out in the granulation processing process and the crosslinking is carried out in the asphalt modification stage; meanwhile, the content of the cross-linking agent is controlled to be low, and a cross-linking promoter cannot be added, so that the increase of the viscosity of the asphalt in the asphalt mixing process is prevented, and the slow cross-linking after the asphalt is transported and paved is further realized; in addition, the extrusion equipment adopts a single-screw extrusion granulation machine instead of a double-screw extruder, so that the problems that the material is not fully plasticized, the resistance between double screws is high, normal extrusion is difficult to ensure and the like when the double-screw extruder is processed under a low-temperature condition are effectively solved.
Compared with the prior art, the invention has the beneficial effects that:
1) the high-modulus warm mix asphalt additive is beneficial to improving the comprehensive performance of an asphalt mixture, and has the advantages of outstanding high-temperature performance, high dynamic modulus, good low-temperature toughness and excellent water loss resistance; and the fuming of the asphalt can be reduced, the construction season of the pavement is expanded, the warm mixing purpose is realized, and the requirements of high modulus, warm mixing and comprehensive use performance are effectively considered.
2) The invention adopts a low-temperature extrusion granulation process, can effectively realize the slow crosslinking after asphalt transportation and paving, and further improves the service performance of the obtained asphalt mixture; and the related reaction conditions are mild, and the energy consumption benefit is remarkable.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
In the following examples, the addition or non-addition of the high modulus warm mix asphalt additive in the asphalt mixture test does not affect the oilstone ratio, so that the grading and oilstone ratio are fixed, and the composition, the blending amount and the blending conditions of the high modulus warm mix asphalt additive material are changed; wherein, the oilstone ratio is defined as the percentage of the total mass of SBS asphalt, aggregate and mineral powder, the adopted SBS asphalt is provided by Korea SK, and the aggregate is basalt stone; the mineral powder is limestone mineral powder; the oilstone ratio was fixed at 4.6 and the specific grading information is shown in table 1.
TABLE 1 grading information
The preparation method of the reference mixture without the additive specifically comprises the following steps: and (3) firstly mixing the aggregate in a mixing pot for 30s, adding SBS asphalt to continue mixing for 90s, and finally adding mineral powder to stir for 90s to obtain the reference asphalt mixture. Wherein the adopted oilstone ratio is 4.6; the heating temperature of the aggregate and the mineral powder is 180 ℃, the heating temperature of the SBS pitch is 160 ℃, and the mixing and discharging temperature is about 160 ℃.
Example 1
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (wherein the main agent comprises 50 parts of polyethylene powder, 10 parts of polyethylene wax, 15 parts of ethylene bis stearamide and 25 parts of pentaerythritol stearate), 40 parts of thermoplastic elastomer (28 parts of linear SBS and 12 parts of star SBS), 60 parts of epoxy soybean oil, 10 parts of terpene resin, 3 parts of monoamino silane coupling agent, 1 part of tris (2, 4-di-tert-butyl) phenyl phosphite antioxidant, 2 parts of montmorillonite and 0.5 part of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 2 hours, and then standing for 6 hours to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring for 5min in a low-speed stirrer, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 60 ℃ (the length-diameter ratio of a screw of the extruder is 20:1, and the rotating speed of the screw is 100rpm) to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a 180 ℃ mixing pot for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.25% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 180 ℃, the heating temperature of SBS asphalt is 160 ℃, and the temperature of mixed discharging is about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 2.
Table 2 results of the performance tests relating to the additive-modified asphalt mixture described in example 1
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.409 | 2.404 |
| Marshall stability (KN) | 14.5 | 16.6 | 14.9 |
| Stability of immersion residue (%) | 81.1 | 87.2 | 84.9 |
| Freeze-thaw cleavage (%) | 75.9 | 84.5 | 80.3 |
| Degree of dynamic stability (times/mm) | 4000 | 10000 | 8000 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2390 | 2100 |
| Low temperatureStrain of bending failure (mu epsilon) | 1890 | 2500 | 2250 |
Example 2
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (wherein 50 parts of polyethylene powder, 15 parts of ethylene bis stearamide, 20 parts of oleamide and 15 parts of stearic acid monoglyceride), 80 parts of thermoplastic elastomer (64 parts of linear SBS and 16 parts of star SBS), 60 parts of epoxy peanut oil, 8 parts of petroleum resin, 5 parts of bisaminosilane coupling agent, 2 parts of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, 3 parts of nano silicon dioxide and 1.0 part of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 3 hours, and then standing for 5 hours to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring in a low-speed stirrer for 3min, and then adding into a single-screw extruder, and extruding and granulating at the low temperature of 80 ℃ (the length-diameter ratio of a screw of the extruder is 28:1, and the rotating speed of the screw is 50rpm) to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a mixing pot at 170 ℃ for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.3% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 170 ℃, the heating temperature of SBS asphalt is 160 ℃, and the temperature of mixed discharging is ensured to be about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 3.
Table 3 results of the performance tests relating to the additive-modified asphalt mixture described in example 2
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.411 | 2.406 |
| Marshall stability (KN) | 14.5 | 17.1 | 15.6 |
| Stability of immersion residue (%) | 81.1 | 88.2 | 85.1 |
| Freeze-thaw cleavage (%) | 75.9 | 84.7 | 80.6 |
| Degree of dynamic stability (times/mm) | 4000 | 11500 | 8500 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2460 | 2100 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2730 | 2370 |
Example 3
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (60 parts of polyethylene powder, 10 parts of Fischer-Tropsch wax, 5 parts of ethylene bis stearamide, 10 parts of pentaerythritol stearate and 15 parts of oleamide), 60 parts of thermoplastic elastomer (45 parts of linear SBS and 15 parts of star SBS), 30 parts of epoxy corn oil, 50 parts of epoxy rapeseed oil, 10 parts of terpene resin, 3 parts of triamino silane coupling agent, 5 parts of tris (2, 4-di-tert-butyl) phenyl phosphite antioxidant, 3 parts of diatomite and 1.5 parts of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 1h, and standing for 7h to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 4 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring for 5min in a low-speed stirrer, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 40 ℃ (the length-diameter ratio of a screw of the extruder is 25:1, and the rotating speed of the screw is 200rpm), so as to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a 160 ℃ mixing pot for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.2% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 160 ℃, the heating temperature of SBS asphalt is 160 ℃, and the temperature of mixed discharging is ensured to be about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing the bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 4.
Table 4 results of the performance tests relating to the additive-modified asphalt mixture described in example 3
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.407 | 2.403 |
| Marshall stability (KN) | 14.5 | 16.1 | 14.5 |
| Stability of immersion residue (%) | 81.1 | 86.7 | 84.5 |
| Freeze-thaw cleavage (%) | 75.9 | 83.6 | 80.5 |
| Degree of dynamic stability (times/mm) | 4000 | 8900 | 7300 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2300 | 1850 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2610 | 2230 |
Example 4
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (50 parts of polyethylene powder, 15 parts of polyethylene wax, 10 parts of ethylene bis stearamide and 25 parts of pentaerythritol stearate), 50 parts of thermoplastic elastomer (35 parts of linear SBS and 15 parts of star SBS), 50 parts of epoxy soybean oil, 5 parts of rosin resin, 3 parts of monoamino silane coupling agent, 3 parts of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, 1 part of montmorillonite and 0.8 part of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 2 hours, and then standing for 8 hours to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring for 5min in a low-speed stirrer, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 65 ℃ (the length-diameter ratio of a screw of the extruder is 30:1, and the rotating speed of the screw is 100rpm) to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a 180 ℃ mixing pot for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.4% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 180 ℃, the heating temperature of SBS asphalt is 160 ℃, and the mixing discharge temperature is about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 5.
Table 5 results of the performance tests relating to the additive-modified asphalt mixture described in example 4
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.410 | 2.406 |
| Marshall stability (KN) | 14.5 | 17.8 | 16.5 |
| Stability of immersion residue (%) | 81.1 | 86.3 | 84.9 |
| Freeze-thaw cleavage (%) | 75.9 | 84.1 | 81.5 |
| Degree of dynamic stability (times/mm) | 4000 | 13000 | 10000 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2500 | 2250 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2490 | 2210 |
Example 5
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (45 parts of polyethylene powder, 10 parts of polyethylene wax, 10 parts of ethylene bis stearamide and 35 parts of oleamide), 60 parts of thermoplastic elastomer (48 parts of linear SBS and 12 parts of star SBS), 80 parts of epoxy rapeseed oil, 8 parts of rosin resin, 3 parts of triamino silane coupling agent, 3 parts of tris (2, 4-di-tert-butyl) phenyl phosphite antioxidant, 1 part of montmorillonite and 0.5 part of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 1.5h, and standing for 6.5h to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 4 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring for 4min in a low-speed stirrer, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 50 ℃ (the length-diameter ratio of a screw of the extruder is 25:1, and the rotating speed of the screw is 150rpm) to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a 180 ℃ mixing pot for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.3% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 175 ℃, the heating temperature of SBS asphalt is 160 ℃, and the mixing discharge temperature is about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing the bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 6.
Table 6 results of the performance tests relating to the additive-modified asphalt mixture described in example 5
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.411 | 2.406 |
| Marshall stability (KN) | 14.5 | 16.8 | 15.5 |
| Stability of immersion residue (%) | 81.1 | 86.1 | 84.5 |
| Freeze-thaw cleavage (%) | 75.9 | 84.3 | 81.2 |
| Degree of dynamic stability (times/mm) | 4000 | 10500 | 8000 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2380 | 2190 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2790 | 2490 |
Example 6
The preparation method of the high-modulus warm-mixed asphalt additive comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (55 parts of polyethylene powder, 5 parts of polyethylene wax, 25 parts of ethylene bis stearamide and 15 parts of pentaerythritol stearate), 60 parts of thermoplastic elastomer (42 parts of linear SBS and 18 parts of star SBS), 50 parts of epoxy soybean oil, 8 parts of petroleum resin, 5 parts of bisamino silane coupling agent, 4 parts of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, 2 parts of montmorillonite and 1.5 parts of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 3 hours, and then standing for 6 hours to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring in a low-speed stirrer for 3min, and then adding into a single-screw extruder, and extruding and granulating at the low temperature of 70 ℃ (the length-diameter ratio of a screw of the extruder is 28:1, and the rotating speed of the screw is 120rpm) to obtain the high-modulus warm-mixed asphalt additive.
Application example
The high modulus warm mix asphalt additive obtained in the embodiment is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the high modulus warm-mixed asphalt additive and aggregate in a 180 ℃ mixing pot for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the high-modulus warm-mixed asphalt additive accounts for 0.3% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 180 ℃, the heating temperature of SBS asphalt is 160 ℃, and the mixing discharge temperature is about 130-140 ℃).
Compacting the mixture of the high-modulus warm mix asphalt additive at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, testing bulk density, compacting the reference mixture without the high-modulus warm mix additive at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 7.
Table 7 results of the performance tests relating to the additive-modified asphalt mixture described in example 6
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.408 | 2.402 |
| Marshall stability (KN) | 14.5 | 17.2 | 16.8 |
| Stability of immersion residue (%) | 81.1 | 87.1 | 85.2 |
| Freeze-thaw cleavage (%) | 75.9 | 84.2 | 81.8 |
| Degree of dynamic stability (times/mm) | 4000 | 11900 | 9000 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2450 | 2175 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2450 | 2180 |
The test results show that: the data of dynamic stability, Marshall stability, dynamic modulus and the like respectively show that the obtained modified asphalt mixture has good high-temperature resistance; the low-temperature bending failure strain respectively shows that the obtained modified asphalt mixture has good low-temperature toughness; the immersion residual stability and freeze-thaw splitting test show that the obtained modified asphalt mixture has excellent water loss resistance; the bulk density change of Marshall test pieces with different molding temperatures shows that the addition of the high modulus warm mixing modifier can reduce the molding temperature by 20-30 ℃.
Comparative example 1
An asphalt additive, the preparation method comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of high-modulus warm-mixing main agent (wherein 50 parts of polyethylene powder, 15 parts of ethylene bis stearamide, 20 parts of oleamide and 15 parts of stearic acid monoglyceride), 8 parts of petroleum resin, 5 parts of bis-amino silane coupling agent, 2 parts of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, 3 parts of nano silicon dioxide and 1.0 part of sulfur;
2) mixing the weighed high-modulus warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5min, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 80 ℃ (the length-diameter ratio of a screw of the extruder is 28:1, and the rotating speed of the screw is 50rpm), thereby obtaining the asphalt additive.
Application example
The asphalt additive obtained in the comparative example is applied to preparing a modified asphalt mixture, and specifically comprises the following steps: mixing the contrast asphalt additive and the aggregate in a stirring pot at 170 ℃ for 30s, adding SBS asphalt, continuously mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the comparative asphalt additive accounts for 0.3% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 170 ℃, the heating temperature of SBS asphalt is 160 ℃, and the temperature of mixed discharging is ensured to be about 130-140 ℃).
The mixture added with the asphalt additive of the comparative example is compacted at 130 ℃ and 140 ℃ respectively to prepare a Marshall test piece, the bulk density is tested, the reference mixture without the comparative additive is compacted at 160 ℃ to prepare the Marshall test piece, and the corresponding test results are shown in Table 3.
Table 8 results of the performance test relating to the additive-modified asphalt mixture described in comparative example 1
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.412 | 2.407 |
| Marshall stability (KN) | 14.5 | 16.5 | 14.6 |
| Stability of immersion residue (%) | 81.1 | 83.2 | 81.2 |
| Freeze-thaw cleavage (%) | 75.9 | 79.7 | 78.6 |
| Degree of dynamic stability (times/mm) | 4000 | 10000 | 8000 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2310 | 2075 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 1930 | 1870 |
As can be seen from Table 8, although the asphalt mixture modified by the additive obtained in the comparative example can show a certain warm mixing effect, the high-temperature performance, the dynamic modulus and the water loss resistance are reduced to a certain extent, and the low-temperature performance is obviously reduced.
Comparative example 2
An asphalt additive, the preparation method comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 100 parts of warm-mixing main agent (25 parts of ethylene bis stearamide and 75 parts of pentaerythritol stearate), 50 parts of thermoplastic elastomer (35 parts of linear SBS and 15 parts of star SBS), 50 parts of epoxidized soybean oil, 5 parts of rosin resin, 3 parts of monoamino silane coupling agent, 3 parts of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, 1 part of montmorillonite and 0.8 part of sulfur;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil filling for 2 hours, and then standing for 8 hours to obtain an oil-filled thermoplastic elastomer;
3) mixing the weighed warm-mixing main agent, the coupling agent, the antioxidant, the anti-aging agent and the crosslinking agent in a low-speed stirrer for 5 min;
4) and adding the oil-filled thermoplastic elastomer into the powder in the second step, stirring for 5min in a low-speed stirrer, and then adding the mixture into a single-screw extruder to perform extrusion granulation at the low temperature of 65 ℃ (the length-diameter ratio of a screw of the extruder is 30:1, and the rotating speed of the screw is 100rpm) to obtain the comparative asphalt additive.
Application example
The asphalt additive obtained in the comparative example is applied to the preparation of the modified asphalt mixture, and specifically comprises the following steps: mixing the contrast asphalt additive and the aggregate in a 180 ℃ mixing pot for 30s, adding SBS asphalt and continuing mixing for 90s, and finally adding mineral powder and stirring for 90s to obtain the modified asphalt mixture. The asphalt-stone ratio of the adopted AC20 asphalt mixture is 4.6, and the comparative asphalt additive accounts for 0.4% of the total mass of the mixture (the heating temperature of aggregate and mineral powder is about 180 ℃, the heating temperature of SBS asphalt is 160 ℃, and the mixing discharge temperature is about 130-140 ℃).
The mixture added with the asphalt additive obtained in the comparative example is compacted at 130 ℃ and 140 ℃ respectively to prepare Marshall test pieces, the bulk density is tested, the reference mixture without the additive is compacted at 160 ℃ to prepare the Marshall test pieces, and the corresponding test results are shown in Table 5.
Table 9 results of the performance test on additive modified asphalt mixture as described in comparative example 2
| Test items | Forming at the standard of 160 DEG C | Adding additive to form at 140 deg.C | Adding additive to form at 130 deg.C |
| Bulk density of wool | 2.405 | 2.412 | 2.406 |
| Marshall stability (KN) | 14.5 | 15.1 | 14.0 |
| Stability of immersion residue (%) | 81.1 | 85.7 | 84 |
| Freeze-thaw cleavage (%) | 75.9 | 83.9 | 82.1 |
| Degree of dynamic stability (times/mm) | 4000 | 8100 | 6530 |
| Dynamic modulus (45 ℃,10Hz, MPa) | 1400 | 2100 | 1750 |
| Low temperature bending failure strain (mu epsilon) | 1890 | 2195 | 2070 |
The above results show that: although the asphalt mixture modified by the additive obtained by the comparative example can show a certain warm mixing effect, the high-temperature performance and the dynamic modulus are reduced to some extent.
In conclusion, the high-modulus warm mix asphalt additive obtained by the invention can give consideration to various performances of the asphalt mixture, can be directly thrown into the mixture, and is suitable for high-modulus asphalt pavement engineering with high environmental protection requirements and low-temperature construction environment in winter.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and all of them belong to the protection scope of the present invention.
Claims (9)
1. The high modulus warm mix asphalt additive comprises the following components in parts by weight:
100 parts of high-modulus warm-mixing main agent;
40-80 parts of a thermoplastic elastomer;
40-80 parts of vegetable oil;
5-10 parts of tackifying resin;
1-5 parts of a coupling agent;
1-5 parts of an antioxidant;
1-3 parts of an anti-aging agent;
0.5-1.5 parts of a crosslinking agent;
the high-modulus warm-mixing main agent is prepared by mixing polyethylene powder and at least three of polyethylene wax, Fischer-Tropsch wax, ethylene bis stearamide, pentaerythritol stearate, oleamide and stearic acid monoglyceride, wherein the polyethylene powder accounts for 40-60% of the total mass of the high-modulus warm-mixing main agent.
2. The high modulus warm mix asphalt additive according to claim 1, wherein said thermoplastic elastomer is a mixture of linear SBS and star SBS, wherein linear SBS is 70-80% by mass.
3. The high modulus warm mix asphalt additive according to claim 1, wherein said tackifying resin is at least one of rosin resin, petroleum resin, terpene resin.
4. The high modulus warm mix asphalt additive according to claim 1, wherein said vegetable oil is an epoxy vegetable oil; the coupling agent is an aminosilane coupling agent.
5. The high modulus warm mix asphalt additive according to claim 1, wherein said antioxidant is pentaerythrityl tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and/or tris (2, 4-di-tert-butyl) phenyl phosphite; the anti-aging agent is at least one of montmorillonite, nano silicon dioxide and diatomite; the cross-linking agent is sulfur.
6. The preparation method of the high modulus warm mix asphalt additive according to any one of claims 1 to 5, characterized by comprising the following steps:
1) weighing the raw materials according to the proportion;
2) placing the weighed thermoplastic elastomer and vegetable oil in a horizontal elastomer mixer, stirring at normal temperature for oil charge treatment, and standing to obtain an oil-charged thermoplastic elastomer;
3) mixing the weighed high-modulus warm-mixing main agent, tackifying resin, coupling agent, antioxidant, anti-aging agent and crosslinking agent in a low-speed stirrer;
4) adding an oil-filled thermoplastic elastomer into the mixed powder obtained in the step 3), mixing in a low-speed mixer, and then adding into a single-screw extruder for extrusion granulation to obtain the high-modulus warm-mixed asphalt additive.
7. The method of claim 6, wherein the oil-extended treatment time is 1-3 hours.
8. The method according to claim 6, wherein the temperature for the extrusion granulation is 40 to 100 ℃.
9. The application of the high modulus warm mix asphalt additive prepared by the preparation method of any one of claims 1 to 5 or any one of claims 6 to 8 in preparing a modified asphalt mixture, wherein the addition amount of the high modulus warm mix asphalt additive is 0.2 to 0.4 percent of the total mass of the modified asphalt mixture.
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