CN102849987A - Low-emission composite phase-change modified asphalt mixture and preparation method thereof - Google Patents
Low-emission composite phase-change modified asphalt mixture and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low-emission composite phase-change modified asphalt mixture and a preparation method thereof. The low-emission composite phase-change modified asphalt mixture comprises the following components in percentage by mass: 20-75% of coarse aggregate, 10-20% of fine aggregate, 20-35% of machined sand, 0-10% of ore powder, 0-1% of fiber, 1.5-10% of asphalt and 0.5-10% of composite phase-change modified granule; the composite phase-change modified granule comprises the following components in percentage by mass: 80-95% of SBS (styrene-butadiene-styrene) and 5-20% of warm mixing agent; and the warm mixing agent is a mixture of stearic acid and paraffin. Compared with the prior art, the warm mixing agent in the composite phase-change modified granule, which is in a liquid state at 90-110 DEG C, effectively lowers the mixing and forming resistance of the mixture and the viscosity of the modified asphalt, and therefore, the mixing and forming temperature is obviously lowered by 30-50 DEG C, thereby saving the coal consumption by heating raw materials and reducing the exhaust emission; and when the temperature is lower than 90-110 DEG C, the warm mixing agent in the composite phase-change modified granule is in a solid state, so that the road application performance of the asphalt mixture can reach or exceed the performance requirement of the modified asphalt mixture.
Description
Technical field
The present invention relates to the preparation method that a kind of low emission type SBS temperature is mixed modified asphalt mixture, belong to road paving materials and processing preparing technical field thereof.
Background technology
Along with highway in China is built development, by the end of the end of the year 2010, the national highway total kilometrage that is open to traffic reaches 398.4 ten thousand kilometers, and the motorway total kilometrage that is open to traffic has reached 7.4 ten thousand kilometers, is sure to occupy the second in the world.The advantages such as bituminous pavement is steady, comfortable because of its driving, noise is low, maintenance is convenient are widely adopted in the road engineering of each grade, and proportion reaches more than 90%.
The road construction cause of China walk the to be over development course of developed country's over half a century of short time more than ten years.But, we also should clearly realize that, because the construction of China's motorway starting is late, technical force's deposit is less, economic base is relatively poor, and the weather of China and traffic loading inclement condition, overload of vehicle is serious, the reasons such as starting material shortage such as the bi tumenf orr oad of high-quality, also there is variety of problems in the express highway pavement structure of making, the its construction level in some highway sections is also not fully up to expectations, even the earlier period damage phenomenons such as rut, cracking, bellding, hole groove have just occured soon that are open to traffic, and has to carry out the big area maintenance.Not only traffic is caused very large impact, also caused economically very large loss.
SBS is styrene-butadiene-styrene block copolymer, outward appearance is that white rice krispies is flower-shaped, and how empty light weight is, adds a certain proportion of SBS properties-correcting agent in matrix pitch, by methods such as shearing, stirrings SBS is scattered in the pitch equably, forms the SBS modifying asphalt.The characteristics of SBS modifying asphalt are 1) have well high temperature resistant, an anti-low temperature ability; 2) having good anti-aging, anti-fatigue ability 3) viscosifying power is strong especially, can significantly improve road surface high temperature resistance rut and cold cracking ability, can obviously improve the resistance to tension after water is met on the road surface, and greatly improved the water stability on road surface, thereby raising pavement durability, reduce the too early appearance of pavement disease, prolong Road Service Life.
Yet because SBS modifying asphalt high temperature viscosity is larger, for satisfying the high degree of compaction standard of pavement construction, so that the mix of asphalt, paving and rolling temperature significantly improves, the mix temperature reaches more than 180 ℃.So high production temperature must cause the aggravation of modifying asphalt short ageing, not only affects the asphalt modification effect, also will consume a large amount of energy simultaneously, produces a large amount of obnoxious flavoures, has a strong impact on surrounding environment quality and producers' health.Therefore, when how can take into account the SBS modified effect, effectively reduce SBS modified asphalt mixture production temperature, the modification technology innovation of energy-saving and emission-reduction, environmental protection is extremely urgent.
Summary of the invention
The object of the present invention is to provide a kind of low emission type composite phase-change modified asphalt mixture, this compound is under the prerequisite that does not affect SBS modified asphalt mixture pavement performance, by preparation composite phase-change modified particles, utilize the warm-mixing agent composition in the composite phase-change modified particles to be liquid state at 90-110 ℃, can effectively reduce described compound mix shaping resistance and modifying asphalt viscosity, therefore, its mix, mold temperature significantly reduce 30-50 ℃, save the coal consumption of heating raw materials, reduce exhaust gas emission; When being lower than 90-110 ℃, the warm-mixing agent composition in the composite phase-change modified particles is solid-state, so that its pavement performance of described asphalt can reach and be better than the performance requriements of modified asphalt mixture.Its technical scheme is as follows:
Low emission type SBS temperature of the present invention is mixed coarse aggregate, the fine aggregate of 10%-20%, 20%-35% Machine-made Sand, the 0%-10% breeze of the mixture that modified asphalt mixture comprises following quality mixture ratio: 20%-65%, 0%-1% fiber, 1.5%-10% pitch and 0.5%-10% composite phase-change modified particles.The composite phase-change modified particles comprises the mixture of following quality mixture ratio: SBS80-95%, warm-mixing agent 5-20%.Wherein, warm-mixing agent is the mixture of stearic acid and paraffin.
A kind of low emission type composite phase-change modified asphalt mixture its preparation method of the present invention comprises the steps: 1) preparation of composite phase-change modified particles: 1. press SBS80-95%, the quality of warm-mixing agent 5-20% compares chosen material; SBS modified particles and the warm-mixing agent that 2. will be warming up to 90-110 ℃ join in the reactor, pass into nitrogen, and pressure remains on 0.2-1Mpa, stir 1-2 after individual hour, and slowly unloading pressure obtains the composite phase-change modified particles; 2) coarse aggregate, fine aggregate are joined in 100-130 ℃ the mix pot, stir 30～60s, add composite phase-change modified particles and Machine-made Sand, breeze, fiber and pitch, restir 30～60s, wherein coarse aggregate, fine aggregate and filler are added to 120～150 ℃, mix and stir 110～140 ℃ of pot design temperatures, obtain low emission type composite phase-change modified asphalt mixture.
Description of drawings
Fig. 1 is the formate gradation composition graphic representation of the low emission type composite phase-change modified asphalt mixture of embodiment 1
Fig. 2 is the formate gradation composition graphic representation of the low emission type composite phase-change modified asphalt mixture of embodiment 2
Embodiment
The present invention will be further described below in conjunction with specific examples, but content of the present invention not only is confined to the following examples.
The project profile of the present embodiment is: surface layer AC-16C type asphalt mixture material design in the Zheng Shi asphalt pavement of highway (the second bid section), engineering adopts the motorway standard, two-way six-lane, 120 kilometers/hour of design speed per hours, average temperature of the whole year is 14.3 ℃ in the district of road, mean annual precipitation 735mm.Its volume of traffic is predicted (seeing Table 2), can find out the volume of traffic annual average rate of increase on this road about 7.5%, and will bear the larger volume of traffic future; According to a minute vehicle traffic volume forecast result, can calculate the not vehicle ratio in the coming year (seeing Table 2), the lorry ratio accounts for about 70%, and heavy transport task will be born in this road, consider the present situation of current overloading wagon, when carrying out Pavement Structure Design, be necessary to consider the impact that overloads.
Table 2 traffic volume forecast table
| Year | 2008 | 2010 | 2015 | The year two thousand twenty | 2028 |
| The volume of traffic (passenger car :/day) | 10055 | 12153 | 18465 | 25377 | 35703 |
Table 3 vehicle schedule of proportion
| Vehicle | Truck | Middle lorry | Buggy | Motor bus | Passenger car | Towed vehicle |
| Vehicle ratio (%) | 14.47 | 26.27 | 10.37 | 12.49 | 18.90 | 17.51 |
According to volume of traffic characteristics in the Project Areas, consider in the situation of overload, a main line interior track of design period accumulative total standard axle load equivalent axles Ne=1.02 * 107 times, design deflection value Ld=0.238 millimeter, final acceptance of construction deflection value are 0.19 millimeter.
1. gather materials and the selection of pitch
The composition material of asphalt mainly is pitch and gathering materials, and forms that low emission type SBS temperature is mixed gathering materials of modified asphalt mixture and pitch should meet " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) correlation technique requirement.
Table 470# pitch detected result
Mineral aggregate adopts the Zheng Shi building stones, and coarse aggregate is 10mm～15mm, 5mm～10mm basalt, and fine aggregate is Machine-made Sand, and breeze is the limestone breeze.
2. determine the addition of composite phase-change modified particles
This example addition is 5%
3. determine compound mix mold temperature
120 ℃ of example low emission type composite phase-change modified asphalt mixture mix temperature, 90 ℃ of compaction moulding temperature.
4. the mix-design of modified asphalt mixture
AC-16C type composite phase-change modified asphalt mixture graduation curve as shown in Figure 1 in the example, wherein 45% coarse aggregate, 15% fine aggregate, 25% Machine-made Sand, 5% breeze, 0.6% fiber, determine method according to the best asphalt content of the asphalt of " standard specification for construction and acceptance of highway asphalt pavement " regulation, can determine that by table 5 its best modifying asphalt consumption is 4.4%.
Marshall Test indices under the table 5 different pitches consumption
5. the performance evaluation of composite phase-change modified asphalt mixture
1) high-temperature behavior check
AC-16C low emission type composite phase-change modified asphalt mixture high temperature stability performance is carried out according to the requirement of T0719-1993 among the JTG052-2000 " highway engineering pitch and Asphalt Mixture Experiment standard ", and test-results sees Table 6.
Table 6AC-13 type low emission type composite phase-change modified asphalt mixture wheel tracking test result (Ds)
Experimental result from upper table, the dynamic stability of AC-16C low emission type composite phase-change modified asphalt mixture be 2582 (inferior/as mum), to satisfy that national regulation JTG F40-2004 " standard specification for construction and acceptance of highway asphalt pavement " requires〉1000 (inferior/mm).
2) crack resistance at low-temperature check
AC-16C type composite phase-change modified asphalt mixture cryostatic stabilization performance according to " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG052-2000) in the requirement of T0716-1993 measure test specimen intensity, loading rate is 1mm/min, respectively plain asphalt compound and composite phase-change modified asphalt mixture are carried out the crack resistance at low-temperature check, adopt the two-sided real marshal piece that hits, hit real 75 moulding Marshall Test test specimens, test temperature-10 ℃.Test specimen is with tensile splitting strength, and destroying stiffness modulus and being damaged deformation is evaluation index.Test-results sees the following form.
Table 7AC-16C type low emission type composite phase-change modified asphalt mixture low temperature cracking test result
| Mix type | Destroy stiffness modulus St (MPa) | Being damaged deformation (mm) | Tensile splitting strength Rt (MPa) |
| The plain asphalt compound | 0.48 | 0.32 | 1.77 |
| The PCWAM asphalt | 0.56 | 0.31 | 2.06 |
By drawing in the above-mentioned low-temperature bending test table, adding behind the composite phase-change modified particles crack resistance at low-temperature, to compare the plain asphalt compound high, can both satisfy code requirement.
Embodiment 2
The project profile of the present embodiment is: the design of Zheng Shi asphalt pavement of highway (the second bid section) the Sub AC-25C type asphalt mixture material, engineering adopts the motorway standard, two-way six-lane, 120 kilometers/hour of design speed per hours, average temperature of the whole year is 14.3 ℃ in the district of road, mean annual precipitation 735mum.Its volume of traffic is predicted (seeing Table 8), can find out the volume of traffic annual average rate of increase on this road about 7.5%, and will bear the larger volume of traffic future; According to a minute vehicle traffic volume forecast result, can calculate the not vehicle ratio in the coming year (seeing Table 9), the lorry ratio accounts for about 70%, and heavy transport task will be born in this road, consider the present situation of current overloading wagon, when carrying out Pavement Structure Design, be necessary to consider the impact that overloads.
Table 8 traffic volume forecast table
| Year | 2008 | 2010 | 2015 | The year two thousand twenty | 2028 |
| The volume of traffic (passenger car :/day) | 10055 | 12153 | 18465 | 25377 | 35703 |
Table 9 vehicle schedule of proportion
| Vehicle | Truck | Middle lorry | Buggy | Motor bus | Passenger car | Towed vehicle |
| Vehicle ratio (%) | 14.47 | 26.27 | 10.37 | 12.49 | 18.90 | 17.51 |
According to volume of traffic characteristics in the Project Areas, consider in the situation of overload, a main line interior track of design period accumulative total standard axle load equivalent axles Ne=1.02 * 107 times, design deflection value Ld=0.238 millimeter, final acceptance of construction deflection value are 0.19 millimeter.
1. gather materials and the selection of pitch
The composition material of asphalt mainly is pitch and gathers materials, and forms and gathering materials of low emission type composite phase-change modified asphalt mixture should meet " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) correlation technique requirement with pitch.
Table 1070# pitch detected result
Mineral aggregate adopts the Zheng Shi building stones, and coarse aggregate is 10mm～15mm, 5mm～10mm basalt, and fine aggregate is Machine-made Sand, and breeze is the limestone breeze.
2. determine the addition of composite phase-change modified particles
This example PCWAM addition is 5%
3. determine compound mix mold temperature
130 ℃ of example low emission type composite phase-change modified asphalt mixture mix temperature, 100 ℃ of compaction moulding temperature.
4. the mix-design of modified asphalt mixture
AC-25C type Asphalt mixture grading curve as shown in Figure 2 in the example, wherein 55% coarse aggregate, 10% fine aggregate, 20% Machine-made Sand, 5% breeze, 0.9% fiber, determine method according to the best asphalt content of the asphalt of " standard specification for construction and acceptance of highway asphalt pavement " regulation, can determine that by table 11 its best asphalt content is 4.1%.
Marshall Test indices under the table 11 different pitches consumption
5. the performance evaluation of modified asphalt mixture
1) high-temperature behavior check
AC-25C low emission type composite phase-change modified asphalt mixture high temperature stability performance is carried out according to the requirement of T0719-1993 among the JTG052-2000 " highway engineering pitch and Asphalt Mixture Experiment standard ", and test-results sees Table 12.
Table 12AC-20C type low emission type composite phase-change modified asphalt mixture wheel tracking test result (Ds)
Experimental result from upper table, the dynamic stability of AC-25C low emission type composite phase-change modified asphalt mixture be 3060 (inferior/as mm), to satisfy that national regulation JTG F40--2004 " standard specification for construction and acceptance of highway asphalt pavement " requires〉1000 (inferior/mm).
2) crack resistance at low-temperature check
AC-25C low emission type composite phase-change Asphalt Mixture at Low Temperature stability according to " highway engineering pitch and Asphalt Mixture Experiment rules " (JTG052-2000) in the requirement of T0716-1993 measure test specimen intensity, loading rate is 1mm/mm, respectively plain asphalt compound and PCWAM asphalt are carried out the crack resistance at low-temperature check, adopt the two-sided real marshal piece that hits, hit real 75 moulding Marshall Test test specimens, test temperature-10 ℃.Test specimen is with tensile splitting strength, and destroying stiffness modulus and being damaged deformation is evaluation index.Test-results sees the following form.
Table 13AC-25C type low emission type composite phase-change modified asphalt mixture low temperature cracking test result
| Mix type | Destroy stiffness modulus St (MPa) | Being damaged deformation (mm) | Tensile splitting strength Rt (MPa) |
| The plain asphalt compound | 0.62 | 0.28 | 2.01 |
| The PCWAM asphalt | 0.66 | 0.24 | 2.46 |
By drawing in the above-mentioned low-temperature bending test table, adding after the PCWAM modification crack resistance at low-temperature, to compare the plain asphalt compound high, can both satisfy code requirement.
Claims (8)
1. low emission type composite phase-change modified asphalt mixture, it is characterized in that comprising coarse aggregate, the fine aggregate of 10%-20%, 20%-35% Machine-made Sand, the 0%-10% breeze of the mixture of following quality mixture ratio: 20%-75%, 0%-1% fiber, 1.5%-10% pitch and 0.5%-10% composite phase-change modified particles.
2. low emission type composite phase-change modified asphalt mixture according to claim 1, it is characterized in that: described pitch is ordinary road petroleum pitch.
3. low emission type composite phase-change modified asphalt mixture according to claim 1, it is characterized in that: described gathering materials selected basalt, diabase or limestone.
4. low emission type composite phase-change modified asphalt mixture according to claim 1, it is characterized in that: described breeze is selected limestone dust.
5. as claimed in claim 1 low emission type composite phase-change modified asphalt mixture is characterized in that the composite phase-change modified particles comprises the mixture of following quality mixture ratio: SBS80-95%, warm-mixing agent 5-20%.
6. according to claim 5 described composite phase-change modified particles, it is characterized in that described warm-mixing agent is: the mixture of stearic acid and paraffin.
7. according to right 5 described composite phase-change modified particles, the fusing point that it is characterized in that described warm-mixing agent is 90-110 ℃.
8. the preparation method of low emission type composite phase-change modified asphalt mixture is characterized in that it comprises following steps: the 1) preparation of composite phase-change modified particles: 1. press SBS80-95%, the quality of warm-mixing agent 5-20% compares chosen material; SBS modified particles and the warm-mixing agent that 2. will be warming up to 90-110 ℃ join in the reactor, pass into nitrogen, and pressure remains on 0.23-1Mpa, stir 1-2 after individual hour, and slowly unloading pressure obtains the composite phase-change modified particles; 2) coarse aggregate, fine aggregate are joined in 100-130 ℃ the mix pot, stir 30～60s, add composite phase-change modified particles and Machine-made Sand, breeze, fiber and pitch, restir 30～60s, wherein coarse aggregate, fine aggregate and filler are added to 120～150 ℃, mix and stir 110～140 ℃ of pot design temperatures, obtain low emission type composite phase-change modified asphalt mixture.
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Cited By (9)
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| CN103205128A (en) * | 2013-04-12 | 2013-07-17 | 深圳市天坤元环保科技有限公司 | Warm mixed asphalt concrete additive and preparation method thereof |
| CN103740394A (en) * | 2013-12-13 | 2014-04-23 | 垦利三合新材料科技有限责任公司 | Preparation method of high-grade road petroleum asphalt |
| CN104761191A (en) * | 2014-01-02 | 2015-07-08 | 广东海川科技有限公司 | Organic composite warm asphalt mixture and preparation method thereof |
| CN105330202A (en) * | 2015-11-04 | 2016-02-17 | 同济大学 | Preparation method of modified asphalt mixture |
| CN106396502A (en) * | 2016-08-31 | 2017-02-15 | 深圳海川新材料科技有限公司 | Foamed warm mix recycled asphalt mixture and preparation method thereof |
| CN106938899A (en) * | 2017-03-29 | 2017-07-11 | 长沙理工大学 | A kind of modified asphalt mixture method for designing suitable for different temperature difference area |
| CN106957157A (en) * | 2017-03-29 | 2017-07-18 | 长沙理工大学 | A kind of fixed phase change heat accumulation cooling ground surface material suitable for high temperature area |
| CN112830712A (en) * | 2021-01-19 | 2021-05-25 | 山东交通学院 | Modified asphalt mixture and preparation method thereof |
| CN116023791A (en) * | 2021-10-25 | 2023-04-28 | 中国石油天然气股份有限公司 | SBS modified asphalt cement particles, and preparation method and application thereof |
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| CN103205128B (en) * | 2013-04-12 | 2015-02-04 | 新疆交通建设（集团）有限责任公司 | Warm mixed asphalt concrete additive and preparation method thereof |
| CN103205128A (en) * | 2013-04-12 | 2013-07-17 | 深圳市天坤元环保科技有限公司 | Warm mixed asphalt concrete additive and preparation method thereof |
| CN103740394B (en) * | 2013-12-13 | 2018-11-02 | 山东三合实业集团有限公司 | A kind of preparation method of asphalt for high-grade highway |
| CN103740394A (en) * | 2013-12-13 | 2014-04-23 | 垦利三合新材料科技有限责任公司 | Preparation method of high-grade road petroleum asphalt |
| CN104761191A (en) * | 2014-01-02 | 2015-07-08 | 广东海川科技有限公司 | Organic composite warm asphalt mixture and preparation method thereof |
| CN104761191B (en) * | 2014-01-02 | 2018-06-29 | 深圳海川新材料科技股份有限公司 | A kind of organic composite Warm-Mix Bitumen Mixture and preparation method thereof |
| CN105330202A (en) * | 2015-11-04 | 2016-02-17 | 同济大学 | Preparation method of modified asphalt mixture |
| CN106396502A (en) * | 2016-08-31 | 2017-02-15 | 深圳海川新材料科技有限公司 | Foamed warm mix recycled asphalt mixture and preparation method thereof |
| CN106938899A (en) * | 2017-03-29 | 2017-07-11 | 长沙理工大学 | A kind of modified asphalt mixture method for designing suitable for different temperature difference area |
| CN106957157A (en) * | 2017-03-29 | 2017-07-18 | 长沙理工大学 | A kind of fixed phase change heat accumulation cooling ground surface material suitable for high temperature area |
| CN106938899B (en) * | 2017-03-29 | 2019-04-02 | 长沙理工大学 | A kind of modified asphalt mixture design method suitable for different temperature difference areas |
| CN106957157B (en) * | 2017-03-29 | 2019-08-02 | 长沙理工大学 | A kind of fixed phase change heat accumulation cooling ground surface material suitable for high temperature area |
| CN112830712A (en) * | 2021-01-19 | 2021-05-25 | 山东交通学院 | Modified asphalt mixture and preparation method thereof |
| CN116023791A (en) * | 2021-10-25 | 2023-04-28 | 中国石油天然气股份有限公司 | SBS modified asphalt cement particles, and preparation method and application thereof |
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Address after: 100044 Xicheng District Exhibition Hall Road, Beijing, No. 1 Applicant after: Beijing University of Civil Engineering and Architecture Address before: 100044 Xicheng District Exhibition Hall Road, Beijing, No. 1 Applicant before: Beijing Engineering and Architecture School |
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Inventor after: Suo Zhi Inventor after: Xu Shifa Inventor after: Ji Jie Inventor after: Wang Xiaoxiao Inventor after: Wang Chunming Inventor before: Xu Shifa Inventor before: Suo Zhi Inventor before: Ji Jie |
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Free format text: CORRECT: INVENTOR; FROM: XU SHIFA SUO ZHI JI JIE TO: SUO ZHI XU SHIFA JI JIE WANG XIAOXIAO WANG CHUNMING Free format text: CORRECT: APPLICANT; FROM: BEIJING INST. OF ARCHITECTURAL ENGINEERING TO: BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE |
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Effective date of registration: 20210421 Address after: 100044 No. 1, Exhibition Road, Beijing, Xicheng District Patentee after: Beijing University of Civil Engineering and Architecture Patentee after: BEIJING BRIDGE RUITONG MAINTENANCE CENTER Co.,Ltd. Address before: 100044 Xicheng District Exhibition Hall Road, Beijing, No. 1 Patentee before: Beijing University of Civil Engineering and Architecture |
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