CN108219487A - A kind of rubber powder modified asphalt and preparation method thereof - Google Patents
A kind of rubber powder modified asphalt and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a kind of rubber powder modified asphalts, and including rubber powder, matrix pitch and additive, by mass percentage, the volume of rubber powder is the 15~25% of rubber powder modified asphalt；The grain size of rubber powder is 40~60 mesh；Matrix pitch is 70# matrix pitches or 90# matrix pitches；Rubber powder is the bias tire rubber powder that normal temperature method crushes.The present invention prepares rubber powder modified asphalt and applied to highway construction using waste tire rubber powder, can not only effectively improve the quality of plain asphalt, improve Pavement Condition, but also can reduce engineering construction cost, save project investment.The present invention while asphalt content is reduced, can give full play to the technical advantage of material, can significantly increase Pavement Performance in the design that rubber powder modified asphalt mixture is carried out based on GTM design methods, reduction later maintenance expense.
Description
Technical field
The present invention relates to modified pitch fields, and in particular to a kind of rubber powder modified asphalt and preparation method thereof.
Background technology
With the development of auto industry, social car ownership increases rapidly, and the quantum of output of China's waste old is closely several
Year sharp increase.There are mainly two types of the recycling of rubber at present and comprehensive utilization mode：Burn heat and production reclaimed rubber.But
It is for burning rubber, secondary pollution can be caused to air during burning, it is contemplated that the needs of environmental protection, it is this
The processing method of waste old has gradually decreased；It is raw since the reclaimed rubber of production is of poor quality otherwise for production reclaimed rubber
Height is polluted during production, energy consumption is big, and the yield of reclaimed rubber is gradually lowered at present.How more effectively comprehensive utilization is useless
Old rubber makes its recycling, is the urgent task in the range of the world today.
In recent years, waste old is made into rubber powder and progresses into research model both domestic and external for the research of road building technology
It encloses.Show waste tire being fabricated to rubber powder through experimental study, added in pitch as modifying agent, pitch can be improved
High temperature performance, anti-aging property, anti-fatigue performance, play thinned road surface, prolonging service life of pavement, delayed reflex crack,
Mitigate the effect of driving noise.
Therefore, waste old making rubber powder is added in pitch has and its great for the research of road building technology
Meaning.
Invention content
The purpose of the invention is to be recycled a large amount of waste tire, reduce environmental pollution, and make use
Modified pitch is used for the raising on road surface built the road using quality and service life, reduces pavement life life cycle costing, saves into
This, and a kind of rubber powder modified asphalt and preparation method thereof is proposed, it is mixed by rubber powder modified asphalt prepared by rubber powder modified asphalt
Material.
In order to solve the above-mentioned technical problem, a kind of rubber powder modified asphalt proposed by the present invention, including rubber powder, matrix pitch
And additive, by mass percentage, the rubber powder is 15~25%, and the additive is 0.1%, and surplus is dripped for matrix
It is green；The grain size of the rubber powder is 40~60 mesh；The matrix pitch is 70# matrix pitches or 90# matrix pitches.
Further, the rubber powder modified asphalt, wherein, the rubber powder is 20%, and the grain size of the rubber powder is 40
Mesh；The additive is rubber oil；The bias tire rubber powder that the rubber powder is crushed by normal temperature method is made.
The preparation method of the rubber powder modified asphalt, including following operating procedure：
Step 1: processing raw material：Rubber powder is dried, drying temperature is 105~115 DEG C；After matrix pitch is dehydrated
It is spare；
Step 2: miscible reaction：Matrix pitch dewatered in step 1 is heated to the flash-point temperature of the matrix pitch
Hereinafter, the rubber powder after being dried in step 1 is added in the matrix pitch, stirring 40~45min of swelling must be mixed degree
Liquid；
Step 3: finished product：Mixed liquor in step 2 is pumped into colloid mill, shearing grinding, then be input to development tank with
260-300r/min rotating speeds stir, and after once adding additive in whipping process, continuously stir 4 hours, obtain rubber powder modified drip
Green finished product.
Further, it in step 2, after the matrix pitch is heated to 180~190 DEG C, is added in into the matrix pitch
The rubber powder.
In step 2, rubber powder is added in matrix pitch, is added in while stirring, is stirred using blender, is stirred
It mixes speed from slow to fast, stirs since the 260-300r/min, mixing speed rises to 1000r/min in 20 minutes, final to stablize
10-15min is stirred in 1000r/min, whipping temp is controlled at 190 DEG C~210 DEG C.
The blender of the blender is screw rod blender.
In preparation process, detect to control movement of the rubber powder modified asphalt at 175 DEG C in real time by Brookfield viscometer
Viscosity is 1.0~4.0Pas, and isolation index is not more than 5 DEG C.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention prepares rubber powder modified asphalt and applied to highway construction using waste tire rubber powder, can not only be effective
Ground improves the quality of plain asphalt, improves Pavement Condition, but also can reduce engineering construction cost, saves project and throws
Money.
2nd, the present invention can administer " black pollution " problem caused by waste tire, efficiently use waste, economize on resources,
Highway construction and the sustainable development of environmental protection work can be advantageously promoted.
3rd, the present invention based on GTM design methods carry out rubber powder modified asphalt mixture design, reduce asphalt content
While, the technical advantage of material can be given full play to, Pavement Performance can be significantly increased, reduces later maintenance expense.
4th, the present invention for waste tire resource recycle can effectively save pitch resource, not only save engineering throw
Money, and waste tyre rubber powder modified pitch replaces SBS modified pitch, per ton to save money 500 yuan, remarkable in economical benefits.
5th, technical scheme of the present invention reduces the environmental pollution of waste tire, reduces and stacks appropriation of land rate；It can
1~3 times of prolonging service life of pavement so as to reduce road maintenance expense, has significant economic and social benefit.
6 present invention are modified plain asphalt using waste tyre rubber powder, and can effectively improve asphalt quality and road surface makes
With performance, prolonging service life of pavement；SBS modified pitch is replaced using rubber powder modified asphalt, fee of material 13% can be saved,
If the modified pitch that China has 1/3 every year uses rubber powder modified asphalt, calculated by 2006 annual consumptions, can be that country saves drip
More than 200,000,000 yuan of green material expense；Rubber powder modified asphalt recycles " black pollution " that damaged tire is brought, outside 20%
The ratio of mixing can be with effectively save petroleum resources, and two-way 6 every kilometer of lane highway can save nearly 40 tons of oil, use simultaneously
Nearly 7500 damaged tires can effectively alleviate environmental pressure, improve living environment.
7th, present invention firstly provides the main Con trolling index of rubber powder modified asphalt be temperature and viscosity, this achievement in research
Development for rubber powder modified asphalt technology provides great reference.
Specific embodiment
A kind of rubber powder modified asphalt proposed by the present invention, including rubber powder, matrix pitch and additive, by mass percentage
Meter, the volume of the rubber powder are the 15~25% of rubber powder modified asphalt, and the additive is 0.1%, and surplus is dripped for matrix
It is green.Wherein, the grain size of the rubber powder is 40~60 mesh, and the matrix pitch is 70# matrix pitches or 90# matrix pitches.
In rubber powder modified asphalt as described above, it is preferable that the volume of the rubber powder is the 20% of rubber powder modified asphalt；
The grain size of the rubber powder is 40 mesh；The matrix pitch is 70# matrix pitches, and the additive is rubber oil.
In rubber powder modified asphalt as described above, it is preferable that the rubber powder is the bias tire rubber powder that normal temperature method crushes；
Normal temperature crushing up refers to a kind of side crushed at normal temperatures to the shear action of waste old roller or other equipment
Method.The production process of normal temperature crushing up be mainly coarse crushing with it is fine crushing.Generally divide three phases：Bulk waste old is broken first
It is broken into the blob of viscose of 50mm sizes；Second step is the micelle that above-mentioned blob of viscose is ground into 20mm again using boulder crusher, then by thick glue
Grain is sent into metal seperator and isolates metal impurities, is re-fed into winnowing machine and removes useless fiber；Third step is will with fine crusher
After above-mentioned micelle is further ground, the rubber powder of 40~200 μm of grain size is finally obtained through sieving and grading.
A kind of preparation method of rubber powder modified asphalt as described above, including following operating procedure：
1) raw material are handled：Rubber powder is dried, drying temperature is 105~115 DEG C；It is spare after matrix pitch is dehydrated；
2) miscible reaction：By matrix pitch dewatered in step 1) be heated to the flash temperature of the matrix pitch with
Under, the rubber powder after drying in step 1) is added in the matrix pitch, stirring 40~45min of swelling obtains mixed liquor；
3) finished product：Mixed liquor in step 2) is pumped into colloid mill, shearing grinding, then is input to development tank with 260-
300r/min rotating speeds stir, after once adding additive in whipping process, continuously stir 4 hours, obtain rubber powder modified asphalt into
Product, it is spare.
In preparation method as described above, it is preferable that in step 2), after the matrix pitch is heated to 180~190 DEG C,
The rubber powder is added in into the matrix pitch.
In preparation method as described above, it is preferable that in step 2), rubber powder is added in matrix pitch, palpus
It adds in while stirring, to prevent the generation splash in whipping process from hurting sb.'s feelings；When starting blender stirring, mixing speed should be by slow
To fast, stir since the 260-300r/min, mixing speed rises to 1000r/min in 20 minutes, final to stablize in 1000r/
Min stirs 10-15min, and whipping temp is controlled at 190 DEG C~210 DEG C.
In preparation method as described above, it is preferable that during rubber powder modified asphalt is prepared, pass through Brookfield viscometer
To control kinematic viscosity of the rubber powder modified asphalt at 175 DEG C as 1.0~4.0Pas, isolation index is not more than 5 for detection in real time
℃。
In the preparation method of the rubber powder modified asphalt of the present invention, when matrix pitch is heated to the temperature of requirement, height is started
Shear dispersion emulsifying machine, side sheared edge are homogeneously added into rubber powder, time as defined in stirring and the guarantor for paying attention to whipping process temperature
It holds, you can make rubber powder modified asphalt sample.The high-shearing dispersion emulsifying machine that the embodiment of the present invention uses is Shanghai Shang Guiji
The opened type use for laboratory high shearing mixing emulsor of tool Electronics Co., Ltd. production, principle is rubber by high speed shear
Rubber powder shreds, is scattered in pitch and forms rubber powder and asphalt.
The specific embodiment of the invention is during rubber powder modified asphalt is prepared, it should be noted that the following：
(1) the preparation stage
1. strictly control rubber powder drying temperature, temperature is too low, and the moisture in rubber powder is not easy to eliminate, and temperature is too high, may
The space net structure of rubber powder is destroyed, drying temperature is by regulation control at 105~115 DEG C；
It when pitch heats is not in overflowing pot phenomenon that 2. the purpose of pitch dewatering, which is, in order to avoid cause fire.
(2) agitation phases are tested
1. when weighing quantitative anhydrobase pitch heating, temperature is paid attention to, it should be below the flash-point of pitch.It is of the invention specific
The flash-point of pitch used in embodiment is 230 DEG C, and matrix pitch heating temperature is heated to 180 DEG C~190 DEG C.
2. rubber powder is added in the pitch of heat, have to add in while stirring, hurt sb.'s feelings to prevent generating splash.
3. start blender stirring, speed should be such that rotating speed gradually settles out from slow to fast.Whipping temp must control
Strictly at 190 DEG C~210 DEG C.
4. controlling mixing time, scrap gum particle should at least react 40 in the matrix pitch of above-mentioned high temperature~
45min makes them fully be swollen, but still remains the core of solid particle.Preferably react 45min.
(3) the later samples preparation stage
It stirring later pitch and carries out second dehydration, the steam that the purpose is to stir when is mixed into modified pitch is discharged,
In order to avoid influence the test result of performance.
It should be noted that in rubber powder modified asphalt preparation process：After matrix pitch is heated to 180 DEG C, rubber powder is poured slowly into
(in order to avoid the agglomerating blocking boxshear apparatus of rubber powder) in matrix pitch, is never poured on nozzle, while does not rush to start high speed shear
Instrument, but side bevelling stirring is wanted, restart high speed shear instrument until being uniformly dispersed.
Technical solution of the present invention is described in further detail with reference to specific embodiment, described specific embodiment
Only the present invention is explained, is not intended to limit the invention.The stirring of the blender used in the embodiment of the present invention
Device is screw rod blender.
Embodiment 1：A kind of rubber powder modified asphalt preparation method, including following operating procedure：
1) raw material are handled：Rubber powder of the grain size for 40 mesh is dried, drying temperature is 105 DEG C；Matrix pitch is dehydrated
It is spare afterwards.
2) miscible reaction：After matrix pitch dewatered in step 1) is heated to 180 DEG C, then will be after drying in step 1)
Mass ratio of the rubber powder using the volume of rubber powder as rubber powder modified asphalt be the stirring swelling 15% into matrix pitch addition
42min obtains mixed liquor；Rubber powder is added in matrix pitch, must be added in while stirring, to prevent in whipping process
Middle generation splash is hurted sb.'s feelings；When starting blender stirring, mixing speed should make speed of agitator by 260-300r/min from slow to fast
Start gradually to settle out, final to stablize in 1000r/min, whipping temp is controlled at 200 DEG C or so, poor 10 DEG C up and down.
3) finished product：Mixed liquor in step 2) is pumped into colloid mill, shearing grinding, then is input to development tank with 260-
300r/min stirring at low speed, and after being 0.1% addition rubber oil according to the mass ratio that additive amount is rubber powder modified asphalt, obtain glue
Powder-modified asphalt finished product.
During the present embodiment prepares rubber powder modified asphalt, pass through Brookfield viscometer real-time measure and control rubber powder modified
Kinematic viscosity of the pitch at 175 DEG C is 1.0~4.0Pas, and isolation index is not more than 5 DEG C.
Embodiment 2：A kind of rubber powder modified asphalt preparation method, including following operating procedure：
1) raw material are handled：Rubber powder of the grain size for 60 mesh is dried, drying temperature is 115 DEG C；Matrix pitch is dehydrated
It is spare afterwards；
2) miscible reaction：After matrix pitch dewatered in step 1) is heated to 185 DEG C, then will be after drying in step 1)
Rubber powder be stirring swelling in 20% addition matrix pitch according to the mass ratio that the volume of rubber powder is rubber powder modified asphalt
45min obtains mixed liquor；It when rubber powder is added in matrix pitch, must add in while stirring, to prevent from producing in whipping process
Raw splash is hurted sb.'s feelings；Mixing speed should be such that speed of agitator is gradually settled out by 260-300r/min from slow to fast, finally
Stablize in 1000r/min, whipping temp is controlled at 200 DEG C or so, poor 10 DEG C up and down.
3) finished product：The step is final to obtain rubber powder modified asphalt finished product with embodiment 1.
It, must movement of the control rubber powder modified asphalt at 175 DEG C during the present embodiment prepares rubber powder modified asphalt
Viscosity is 1.0~4.0Pas, and isolation index is not more than 5 DEG C.
Embodiment 3：A kind of rubber powder modified asphalt preparation method, including following operating procedure：
1) raw material are handled：Rubber powder of the grain size for 40 mesh is dried, drying temperature is 110 DEG C；Matrix pitch is dehydrated
It is spare afterwards；
2) miscible reaction：After matrix pitch dewatered in step 1) is heated to 190 DEG C, then will be after drying in step 1)
Mass ratio of the rubber powder using the volume of rubber powder as rubber powder modified asphalt be the stirring swelling 25% into matrix pitch addition
40min obtains mixed liquor；It when rubber powder is added in matrix pitch, must add in while stirring, to prevent from producing in whipping process
Raw splash is hurted sb.'s feelings；When starting blender stirring, mixing speed should be such that speed of agitator gradually settles out from slow to fast, and will stir
Temperature control is mixed at 190 DEG C~210 DEG C；
3) finished product：The step is final to obtain rubber powder modified asphalt finished product with embodiment 1.
It, must movement of the control rubber powder modified asphalt at 175 DEG C during the present embodiment prepares rubber powder modified asphalt
Viscosity is 1.0~4.0Pas, and isolation index is not more than 5 DEG C.
Miscible system of the waste tyre rubber powder modified pitch as rubber powder and matrix pitch of the present invention, rubber powder it is thin
Degree, particle surface situation, volume and internal constituent directly affect rubber powder and the miscible development of matrix pitch speed and
Degree is specifically shown in embodiment 4 to embodiment 6.
Embodiment 4：Influence of the rubber powder size to rubber powder modified asphalt performance.
The preparation method of the present embodiment rubber powder modified asphalt is in the same manner as in Example 3, and details are not described herein.
The rubber powder of the present invention characterizes the size of its grain size with mesh number, its bigger grain size of mesh number is smaller.In the present embodiment
The volume of rubber powder is fixed as 20% that its percentage is matrix pitch, and 20 mesh, 40 mesh and 60 purposes three are respectively adopted as grain size
A sample, and using softening point, 25 DEG C of needle penetrations, 175 DEG C of rotary viscosities, 25 DEG C of elasticity recoveries and thin film oven aging experiment
To evaluate the performance of rubber powder modified asphalt.
Rubber powder modified asphalt mixes and stirs technique all using simple agitation, and mixing speed 1000r/min, mixing time are
10 minutes, consolute temperature be 190 DEG C.The performance test data of rubber powder modified asphalt under different rubber powder sizes are shown in Table 1.
The performance test data of rubber powder modified asphalt under the different rubber powder sizes of table 1
By 1 test data of table it is found that the incorporation of rubber powder plays matrix pitch good modified effect, with rubber powder
The reduction of grain size, rubber powder modified asphalt change software strategy into software-hardware strategy, and viscosity increase, needle penetration reduce, softening point increase, and high-temperature behavior has
It is preferable to improve.From the point of view of performance is with the variation tendency of rubber powder size, rubber powder size from 20 mesh to 40 mesh when, performance improvement
It is more apparent, but from 40 mesh to 60 mesh when, the raising of performance is relatively slow.
Glue can be most characterized it can be seen from the above-mentioned Adaptability Analysis for rubber powder modified asphalt high-temperature behavior evaluation index
The rotary viscosity of powder-modified asphalt actual performance is increasing with the reduction of rubber powder size, but penetration test result is but
Increase with the reduction of rubber powder size, embody the variation tendency opposite with viscosity, this is because when rubber powder is thicker,
Influence to standard needle is bigger, also uncomfortable from mechanism from side illustration penetration test so as to cause test value deviation larger
Evaluations of the Ying Yu to rubber powder modified asphalt.Meanwhile rubber powder size from 40 mesh to 60 mesh when, the rotation at 175 DEG C of rubber powder modified asphalt
Turn viscosity and 2.1Pa.s is increased to by 1.8Pa.s, and softening point only increases to 60.1 DEG C from 59.2 DEG C, amplification degree is far small
In viscosity index, also reflect that conventional softening point test can not characterize the true viscosity of rubber powder modified asphalt from side
Can, it is more the high temperature anti-current kinetic force for embodying the absorbed free pitch of light composition between rubber powder, can only illustrates rubber
With the reduction of rubber powder size, the degree of developmental response is more violent for powder and matrix pitch.
In addition, index can be seen that when rubber powder size is when 20 mesh are between 40 mesh after aging, rubber powder modified asphalt is old
Mass change after change is between 0.07%~0.13%, and penetration ratio is all higher than 70%, and anti-aging property has very big carry
It is high.From the point of view of 25 DEG C of elasticity restore index, the variation of rubber powder size is to the recovery deformability shadow after rubber powder modified asphalt loading
Sound is smaller.
Summary data, the performance of rubber powder modified asphalt is more apparent with the variation of rubber powder size, with rubber powder size
Reduction, the specific surface area of rubber powder is bigger, be swollen in pitch it is more abundant, so as to rubber powder modified asphalt viscosity it is bigger,
I.e. high temperature stability performance is better.But the improvement of performance is not simple linear relationship with the variation degree of rubber powder size,
Can not briefly rubber powder it is smaller, the performance of modified pitch is just centainly better.Moreover, from construction and engineering cost
For angle, rubber powder is thinner, and processing cost is also higher, at the same easily conglomeration and influence modified effect.Therefore, it is comprehensive
It closes and considers rubber powder modified asphalt performance and its workability in itself, when production rubber powder modified asphalt of the present embodiment should select 40
Purpose rubber powder is optimal.
Embodiment 5：Influence of the rubber powder volume to rubber powder modified asphalt performance.
Based on the achievement in research of embodiment 4, for the present embodiment under the premise of 40 mesh rubber powders, it is respectively to be to make rubber powder volume
Three samples of 15%, 20% and the 25% of matrix pitch, the processing technology of rubber powder modified asphalt is identical in embodiment 3,
This is repeated no more.Still using softening point, 25 DEG C of needle penetrations, 175 DEG C of rotary viscosities, 25 DEG C of elasticity restore and thin film oven is old
Change experiment to evaluate the performance of rubber powder modified asphalt, while using BBR bent beam creep test stiffness indexs pair in SHRP systems
Its cryogenic property is studied.The performance test data of rubber powder modified asphalt under different rubber powder volumes are shown in Table 2.
The performance test data of rubber powder modified asphalt under the different rubber powder volumes of table 2
By 2 test data of table, it is apparent that the variation of rubber powder volume is affected to rubber powder modified asphalt performance,
With the increase of rubber powder volume, recoverable force performance and anti-ageing after the high-temperature behavior of rubber powder modified asphalt, cryogenic property, loading
Change performance to be greatly improved.Wherein, rubber powder volume increases to 25% by 15%, viscous at 175 DEG C of rubber powder modified asphalt
Degree increases to 3.8Pa.s by 1.5Pa.s, softening point increase by 11.1 DEG C, elasticity restore by 51% to increase to 76%, -18 DEG C are exert oneself
Degree modulus reduces 75% or so.It is light in rubber powder absorption base pitch this is mainly due to the increase of rubber powder volume
Matter ingredient is more, makes the pitch that remaining free pitch contains ratios dilute, so as to make the viscosity of pitch and low-temperature creep stiffness
Increase；Moreover, rubber powder have relatively better recoverable force ability, with the increase of its volume, rubber powder modified asphalt it is whole
Body recoverable force ability also improves therewith.
It is advantageous it can be seen that increasing rubber powder volume for improving the performance of matrix pitch.But simultaneously it should also be noted that
There is very big amplification to the viscosity with the increase of rubber powder volume, rubber powder modified asphalt, and excessively high viscosity can be to the pump of pitch
It send and mixture mixes and stirs, paves and cause bigger difficulty, therefore, it should the volume of rubber powder be limited in a certain range, examined
Consider requirement of the production and construction process to rotary viscosity 1.5Pa.s~3.5Pa.s at 175 DEG C of rubber powder modified asphalt, this implementation
Rubber powder volume is determined as mixing 20% outside by example.
Embodiment 6：Influence of the matrix pitch grade to rubber powder modified asphalt performance.
Miscible system of the rubber powder modified asphalt of the present invention as rubber powder and matrix pitch, the grade of matrix pitch is to it
Quality has important influence.Such as in the application process in South Africa, when for hot-mix asphalt mixture, needle penetration etc. is selected
Grade be 60~70 matrix pitch, and be used for interlayer dispense when, then select partially soft penetration grade be 80~100 or 100
~150 matrix pitch.And matrix pitch is carried out PG classifications by State of Arizona, US, is prepared by different brackets matrix pitch
Rubber powder modified asphalt be respectively suitable for hot-zone, warm area and Han Qu.
It can be seen that modified effect difference of the different grades of matrix pitch for rubber powder modified asphalt.This implementation
Example mixed using 70# and 90# matrix pitches as research object, outside rubber powder 20% and grain size using 40 mesh, based on 175 DEG C of rotary viscosities,
25 DEG C of elasticity restore and SHRP systems in the indexs such as BBR bent beam creep stiffness study matrix pitch grade to rubber powder modified
The influence situation of asphalt performance.Wherein, the technique of mixing and stirring of rubber powder modified asphalt ibid saves, rubber powder modified under different substrates pitch
The performance test results of pitch are as shown in table 3.
The performance test data of the rubber powder modified asphalt of 3 different brackets matrix of table
It can be seen from 3 test data of table due in 90# matrix pitches light components content it is higher, through modifying rubber powder
Cryogenic property afterwards is slightly above the modified effect of 70# matrix pitches, and the recovery deformability after its loading is also relatively strong, but
It is from the point of view of high temperature performance index, small after the ratio of viscosities 70# asphalt modifications after 90# asphalt modifications, high temperature resistance to flow can be compared with
It is weak.Therefore, in the production application of rubber powder modified asphalt, it should according to different weather conditions and road surface loading characteristic, there is needle
Matrix pitch is selected to be modified property.The matrix pitch of the present embodiment is preferably 70# matrix pitches.
The rubber powder modified asphalt of the present invention is a kind of miscible system of semisolid continuous phase, is different from traditional matrix completely
Pitch and polymer modified asphalt, most of rubber powder granule that desulfurization cracking reaction does not occur are suspended in the miscible system.Glue
This characteristic of powder-modified asphalt certainly will be brought greater impact to the design method of asphalt, traditional design method
And whether mineral aggregate gradation structure is still adapted to rubber powder modified asphalt mixture and is worth further studying.It is of the invention specific real
It applies in example using the mix-design that rubber powder modified asphalt mixture is carried out based on GTM design methods.
The present invention is obtained by experimental study, for AR-20 type rubber powder modified asphalt mixtures, GTM rotational shear methods
Determining optimum oil-stone ratio is 5.0%, and optimum oil-stone ratio determined by Marshall volume method is 5.3%, if with GTM
Based on the optimum oil-stone ratio that mechanics design method determines, then bitumen aggregate ratio determined by marshall' mechanic characteristic value increases 6%.
This is mainly due to GTM mechanics design method using rotational shear mode shaping test piece, tied using state of limit equilibrium as molding
Beam condition so that gather materials and be easier to reposition in three dimensions under kneading action, until reach stable state, so as to
Form the asphalt that density is larger and structure is more stable.GTM rotational shear design methods reach to avoid asphalt
Shearing strength and non-deformability is caused to fall to criterion to hypersaturated state, due to shearing rubbing compacting mode effectively and
Compaction Effort is larger so that it is to reach hypersaturated state that asphalt is smaller in bitumen aggregate ratio.And Marshall is hammered into
The Compaction Effort of type mode is smaller, gathers materials and is being difficult to rearrange positioning in hammer mode so that void in mineral aggregate is larger, foundation
The principle of volumetric design to ensure that volume parameter reaches corresponding index, is just necessarily required to increase bitumen content.Therefore,
Optimum oil-stone ratio is relatively large determined by marshall' mechanic characteristic value.The size of asphalt asphalt optimum content depends on
Molding mode and Appreciation gist, thus, the reasonability of design method and Appreciation gist determines choosing whether for bitumen aggregate ratio by direct
Properly.A large amount of laboratory tests and engineering practice verified marshall' mechanic characteristic value sentencing in molding mode and optimum oil-stone ratio
Fixed etc. to have drawback, determining asphalt optimum content is larger.And GTM shear designs method with rotate and knead for molding
Mode, using mechanics parameter GSI and GSF with the variation tendency of bitumen aggregate ratio as the judgment basis of optimum oil-stone ratio, method section
, standard are objective, therefore, it is considered herein that being proper using optimum oil-stone ratio determined by GTM rotational shear methods
, and asphalt optimum content is significantly bigger than normal determined by Marshall method.
AR-13C types rubber powder modified asphalt mix proportion design provided in an embodiment of the present invention uses GTM methods, tool
Body is shown in embodiment 7.
Embodiment 7：Bitumen aggregate ratio is determined.
The AR-13C type rubber powder modified asphalts mix proportion design of the present embodiment uses GTM methods.Specimen molding item
Part is：Pressure at right angle 0.8MPa；Mix and stir 190 DEG C of temperature；175 DEG C~185 DEG C of forming temperature；Control mode is limiting equilibrium shape
State.
Bitumen aggregate ratio 5.1%, 5.4%, 5.7%, 6.0% is selected, GTM test specimens are molded by above-mentioned condition.By T 0705-2000
(surface drying method) measures test specimen bulk specific gravity, and effective phase of formate gradation composition mine material mixture is surveyed according to pitch dipping method
To density (being shown in Table 4) and calculate asphalt maximum theoretical relative density.GTM test specimens volume parameter and Marshall Test knot
Fruit is shown in Table 5, GTM result of the tests and is shown in Table 6.Wherein the void in mineral aggregate VMA of bitumen mixture specimen is according to JTG F40-2004《It is public
Road Asphalt Pavement Construction Technique specification》, calculated using the synthesis bulk specific gravity of mine material mixture.
The effective relative density test result of 4 synthetic aggravation of table
5 AR-13C types rubber powder modified asphalt mixture GTM test specimens volume parameter of table and Marshall stability test result
6 AR-13C type rubber powder modified asphalt mixture GTM result of the tests of table
By table 6 as it can be seen that whether judgement this granular plastic material of asphalt will appear the excessive phenomenon of plastic deformation
Index GSI (coefficient of stability) increases with the increase of bitumen aggregate ratio, when bitumen aggregate ratio significantly increases more than 5.4%, GSI, shows to mix
The pitch closed in material is excessive, and the plastic deformation of test specimen is excessive；Parameter GSF in terms of shear strength of asphalt mixture is reflected
From the point of view of (safety coefficient) is with the situation of change of bitumen aggregate ratio, when bitumen aggregate ratio is equal to 5.4%, GSF values are maximum, when bitumen aggregate ratio is more than
5.4%, with the increase of bitumen aggregate ratio, GSF values reduce.Consider size and the variation of GTM result of the tests and reference volume parameter
Trend.In view of residing for different engineerings local climate feature, highway canalized traffic the characteristics of and convenient for Construction control, this
The bitumen aggregate ratio control range of the asphalt of embodiment is 5.2%~5.6%.Preferably, AR-13C types rubber powder modified is dripped
Green mixture optimum oil-stone ratio is determined as 5.4%.
Embodiment 8：The match ratio of rubber powder modified asphalt mixture.
Based on the result of study of embodiment 7, the match ratio of rubber powder modified asphalt mixture provided in this embodiment is：Rough set
Expect 10mm~15mm：Coarse aggregate 5mm~10mm：Machine-made Sand：Miberal powder=30.0：26.0：40.0：4.0；Bitumen aggregate ratio is 5.4%.
The preparation method of the present embodiment rubber powder modified asphalt is in the same manner as in Example 3, and details are not described herein.
The preparation method of the rubber powder modified asphalt mixture of the present embodiment uses existing conventional techniques means, the present invention
This is not construed as limiting.
The performance detection parameter of rubber powder modified asphalt mixture manufactured in the present embodiment is shown in Table 7.
The performance detection parameter of 7 rubber powder modified asphalt mixture of table
In addition, fully being mixed and stirred with rubber powder modified asphalt to enable to gather materials, farthest improve rubber powder modified asphalt and mix
Close the quality of production of material, it should the stringent links controlled during mixing and stirring.
Viscosity at 175 DEG C of rubber powder modified asphalt is controlled between 1.0~4.0Pas, and so big viscosity may
Cause pitch pump time too long, so as to cause the material such as hot aggregate bin so that mixture drop temperature is higher, while can also reduce
The yield of batching plant.Therefore, should reduce rubber powder modified asphalt conveyance conduit length as far as possible, at the same can also overstriking pipeline or
Person is conveyed using the bitumenpump of relatively high power, and pipeline should be preheated in advance before producing.
For rubber powder modified asphalt mixture, the mixing time should be appropriately extended, the wherein dry mixing time must not be less than 10 seconds, wet
Mixing the time must not be less than 40 seconds.The stage of mixing and stirring should fully consider material property, implement monitoring rubber powder modified asphalt and mineral aggregate plus
Hot temperature, and the temperature of mixture is measured by vehicle.The stage is mixed and stirred in the rubber powder modified asphalt mixture production of the present embodiment
Temperature controlling range is shown in Table 8.
Phase temperature control range is mixed and stirred in the production of 8 rubber powder modified asphalt mixture of table
| The stage is mixed and stirred in production | Each phase temperature control requirement |
| Rubber powder modified asphalt heating temperature | 185 DEG C~195 DEG C |
| Mineral heating up temperature | 200 DEG C~210 DEG C |
| Mixture laying temperature | 180 DEG C~185 DEG C |
| Mixture is discarded | ≥195℃ |
The rubber powder modified asphalt mixture of the present embodiment should with mix with.The presentation quality of monitoring finished product material in real time, finds
Abnormal analysis reason, and take measures to correct in time.
Embodiment 9
It is applied in road building technology according to the rubber powder modified asphalt mixture that embodiment 8 is prepared.In construction in strict accordance with
Code requirement carries out, and has carried out relevant Data Detection, every testing result such as table 9.
9 test section result of the test of table
In conclusion the rubber powder modified asphalt of the present invention is to produce under (>=180 DEG C) and high speed shear under the high temperature conditions
, the physical reactions between pitch and rubber constituent are promoted, rubber grain is made to be suspended in pitch.Rubber powder modified asphalt is used for
Usually as cementitious matter in various asphalt pavement structures (including crushed stone sealing and hot-laid mixture), it is also possible to make pointing.
The present invention rubber powder modified asphalt mechanism of modification be：Waste rubber tyre powder is miscible under the high temperature conditions with pitch, and one side rubber powder is inhaled
The light components volume sweell(ing) in pitch is received, waste rubber tyre powder mechanical characteristic is improved：Elastic property reduces, but remains above drip
It is green；Plasticity obtains part recovery.Light component content is reduced in one side pitch, and asphalt viscosity increases, and temperature sensitivity obtains
Improve.Meanwhile rubber powder is chemically reacted with active function groups in pitch in swelling process, rubber powder partial oxidation solution
Poly-, age resister, carbon black, zinc compound active constituent in rubber powder enter pitch colloidal dispersion, make asphalt temperature stability,
Ageing properties are improved.When rubber powder modified asphalt is below room temperature or room temperature, rubber powder plays reinforcement in pitch
Effect improves the elasticity and low-temperature cracking-resistance of pitch.In simple terms, with the addition of rubber powder, due to physics and chemical modification
Collective effect, improve the performance of script matrix pitch, achieve the purpose that modified.
The processing technology of the rubber powder modified asphalt of the present invention includes mixing and stirring temperature, mixing time and storage mode etc..
The most important Con trolling index of the rubber powder modified asphalt of the present embodiment is temperature and viscosity.When preparing rubber powder modified asphalt, also
It should pay attention to the following：
(1) under normal circumstances, rubber powder modified asphalt should not store over 6h at a temperature of 180 DEG C in application process,
It is stored at a temperature of 140 DEG C also no more than 12h, it is desirable to timely use.Rubber powder modified asphalt was in miscible reaction 45 minutes
Afterwards, if do not used in 4 hours, it should stop heating.
(2) temperature is the key that the control rubber powder modified asphalt quality of production, the production tank of rubber powder modified asphalt and storage always
Heating and Insulation should all be had by depositing tank, can be heated to 190~220 DEG C.Rubber powder modified asphalt produces at the scene to be needed to use
Special processing equipment, screw rod blender are also the capital equipment of rubber powder modified asphalt production, to ensure that rubber powder is dripped in matrix
It is uniformly dispersed in blueness.
(3) in rubber powder modified asphalt production process, change of the rubber powder modified asphalt viscosity with the reaction time should be monitored at any time
Change, for ensureing the quality of production.
(4) binding entity engineering application state, the present invention by the control of 175 DEG C of kinematic viscosity of rubber powder modified asphalt 1.0~
Between 4.0 Pas, isolation index should be not more than 5 DEG C.Viscosity index of the rubber powder modified asphalt at 175 DEG C is in production application
The most key project in the process, it is necessary to assure rubber powder modified asphalt using when viscosity reach technical standard.
In addition, the composition that GTM methods are applied to rubber powder modified asphalt mixture by the present invention designs, the results showed that GTM side
Method is more suitable for the relatively large number of continuous type grading of content of coarse aggregate, and the rubber powder modified asphalt mixture of continuous type grading is more easy to press
It is real.Rubber powder modified asphalt mixture may be used the relatively large number of continuous type grading of content of coarse aggregate, in rubber powder modified asphalt
Rubber powder granule does not generate larger interference effect to the composition structure of mixture and influences performance.It is rotated into based on GTM
Type mode, the rubber powder modified asphalt mixture of continuous type grading are more easy to be compacted.Molding mode is hammered relative to traditional Marshall,
Rubber powder modified asphalt mixture under GTM rotational formings has better pavement performance under relatively low bitumen aggregate ratio.
According to there is shutting mechanism to research and analyse, 0.4 ton of standard coal can be saved using 1t damaged tires, reduces 30t sewage discharges, is reduced
1.8t solid waste discharges reduce 23t Air Pollutant Emissions.Accordingly, the total saving energy 115t of waste tire industry in 2008
Standard coal reduces 86,000,000 tons of discharge of wastewater, reduces 5,150,000 tons of solid waste discharge, reduces discharge sulfur dioxide 6.6 ten thousand
Ton.Furthermore as international and domestic crude oil price persistently rises, asphalt price is also constantly increasing.Made extensively with SBS in China
For asphalt modifier, SBS is expensive, and most by import, and rubber powder is compared with other modifying agent, cheap.And with
SBS compares, and the addition of rubber powder increases, and the cost of rubber powder modified asphalt reduces instead.One ton of waste tyre rubber powder of production is modified
Pitch (20%) substitutes SBS modified pitch (4%), can reduce about 0.35 ton of CO2 emission.Disappeared every year with domestic at present
2,000,000 tons of meters of SBS modified pitch are consumed, if wherein 25% is replaced by waste tyre rubber powder modified pitch, useless wheel can be consumed every year
100,000 tons of tire so that 10,000,000 damaged tires are utilized, and reduce 20,000 tons of SBS dosages, save 80,000 tons of pitch, reduce dioxy
Change 17.5 ten thousand tons of carbon emission, therefore the popularization of rubber powder modified asphalt technology, there is significant economic, society, environment and low-carbon effect
Benefit.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and principle within, any modification, equivalent replacement, improvement and so on, accompanying claims protection domain of the present invention it
It is interior.
Claims (8)
1. a kind of rubber powder modified asphalt, including rubber powder, matrix pitch and additive, which is characterized in that
By mass percentage, the rubber powder is 15~25%, and the additive is 0.1%, and surplus is matrix pitch；
The grain size of the rubber powder is 40~60 mesh；The matrix pitch is 70# matrix pitches or 90# matrix pitches.
2. rubber powder modified asphalt as described in claim 1, which is characterized in that the rubber powder is 20%, the grain of the rubber powder
Diameter is 40 mesh；The additive is rubber oil.
3. rubber powder modified asphalt as described in claim 1, which is characterized in that the bias tire that the rubber powder is crushed by normal temperature method
Rubber powder is made.
4. the preparation method of a kind of rubber powder modified asphalt as described in claims 1 to 3 is any, which is characterized in that including following
Operating procedure：
Step 1: processing raw material：Rubber powder is dried, drying temperature is 105~115 DEG C；It is spare after matrix pitch is dehydrated；
Step 2: miscible reaction：By matrix pitch dewatered in step 1 be heated to the flash temperature of the matrix pitch with
Under, the rubber powder after being dried in step 1 is added in the matrix pitch, stirring 40~45min of swelling obtains mixed liquor；
Step 3: finished product：Mixed liquor in step 2 is pumped into colloid mill, shearing grinding, then is input to development tank with 260-
300r/min rotating speeds stir, after once adding additive in whipping process, continuously stir 4 hours, obtain rubber powder modified asphalt into
Product.
5. the preparation method of rubber powder modified asphalt as claimed in claim 4, which is characterized in that in step 2, the matrix pitch
After being heated to 180~190 DEG C, the rubber powder is added in into the matrix pitch.
6. the preparation method of rubber powder modified asphalt as claimed in claim 4, which is characterized in that in step 2, rubber powder is added in
To matrix pitch, add in, stirred using blender while stirring, mixing speed from slow to fast, from 260-300r/min
Start to stir, mixing speed rises to 1000r/min in 20 minutes, and final stablize stirs 10-15min, stirring temperature in 1000r/min
Degree control is at 190 DEG C~210 DEG C.
7. the preparation method of rubber powder modified asphalt as claimed in claim 6, which is characterized in that the blender of the blender is spiral shell
Swing arm blender.
8. the preparation method of rubber powder modified asphalt as claimed in claim 4, which is characterized in that in preparation process, pass through Bu Shi
Viscosimeter detection in real time is to control kinematic viscosity of the rubber powder modified asphalt at 175 DEG C as 1.0~4.0Pas, and isolation index is not
More than 5 DEG C.
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| CN114854218A (en) * | 2022-03-28 | 2022-08-05 | 东南大学 | High-content rubber modified asphalt and preparation method and application thereof |
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| CN115785687A (en) * | 2022-12-22 | 2023-03-14 | 东南大学 | High-toughness high-viscosity modified asphalt and preparation method thereof |
| CN115785687B (en) * | 2022-12-22 | 2024-04-09 | 东南大学 | High-toughness high-viscosity modified asphalt and preparation method thereof |
| CN117720822A (en) * | 2023-11-30 | 2024-03-19 | 中国海洋大学 | Modified warm mix rubber asphalt and preparation method thereof |
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Application publication date: 20180629 |