CN103819913A - High-performance modified asphalt, and preparation method and preparation apparatus thereof - Google Patents
High-performance modified asphalt, and preparation method and preparation apparatus thereof Download PDFInfo
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- CN103819913A CN103819913A CN201410060602.6A CN201410060602A CN103819913A CN 103819913 A CN103819913 A CN 103819913A CN 201410060602 A CN201410060602 A CN 201410060602A CN 103819913 A CN103819913 A CN 103819913A
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Abstract
The invention relates to a high-performance modified asphalt, and a preparation method and a preparation apparatus thereof. The high-performance modified asphalt comprises 70-80wt% of matrix asphalt and 20-30wt% of Buton rock asphalt, wherein the content of asphalt in the Buton rock asphalt is 20-30%. The high-performance modified asphalt has the advantages of high adsorption capability to the surface of a rock material, good anti-strip performance, high rut resistance at a softening point, tensile resistance, strong ageing and oxidation resistance, strong water damage resistance, strong microbial erosion resistance, improvement of the driving comfort level of vehicles on a road, prolongation of the service life of the road, environmental protection, good weatherability and low cost, and has a good popularization application value.
Description
Technical field
The present invention relates to a kind of high performance modified bitumen, particularly a kind of high performance modified bitumen and preparation method thereof and device.Background technology
In recent years, the fast development of Chinese society's economy has brought the rapid growth of the moving defeated demand of traffic, and plain asphalt road surface is open to traffic and just occurs soon serious destruction, as cold cracking, rut, Moisture Damage, hole groove etc., has caused serious harm.And the requirement kind under wearing away for a long time through long-time and vehicle of asphalt concrete road surface at ordinary times and SBS modified road (vinylbenzene) is repaiied or is transformed, road surface is originally aging, can only root out and lose, will cause large-area place to stack or landfill, so just cause environmental pollution.
Rock asphalt, as the one of pitch, has stable in properties, and consistency is good, cheap.Natural rock asphalt study on the modification result shows, it has antistripping, anti-aging, the anti-rut of high temperature, durable feature, and this has determined that rock asphalt will have wide research and development space and market potential.
The honest rock asphalt of cloth is as rock asphalt one, is called for short BRA, is constantly from the earth's crust, to emerge and be present in massif, rock fracture due to oil, the rock asphalt forming through long-term evaporation coagulation.BRA forms subparticle after pulverizing, and is light brown, and all the other are lime rock mineral substance.
Summary of the invention
The object of this invention is to provide a kind of high performance modified bitumen and preparation method thereof and device, the modifying asphalt of producing has good antistrip performance, softening temperature rutting resistance is high, stretching resistance, anti-aging oxidation susceptibility and water resistant are damaged, and improve the driving comfort level of highway, extend highway work-ing life, good weatherability, environmental friendly regenerated, cost is low.
High performance modified bitumen of the present invention, by weight percentage, raw material is composed as follows:
Matrix pitch: 70-80%, the honest rock asphalt 20-30% of cloth, the honest rock asphalt Asphalt Content of wherein said cloth is 20-30%.
By weight percentage, high performance modified bitumen raw material composition is preferably matrix pitch: 80%, and the honest rock asphalt 20% of cloth.
Matrix pitch is preferably matrix pitch SK-70.The manufacturer of matrix pitch SK-70 is SK group of Korea S.
Median size after the honest rock asphalt powder of described cloth grinds is 60-200 order.
The honest rock asphalt of cloth, the mineral substance in BRA is very thin, has the ability of good absorption pitch, can strengthen the adhesive attraction of pitch and mineral aggregate, plays a kind of effect of promoting agent.
In the honest rock asphalt of cloth, nitrogen element exists with functional group's form, make the honest rock asphalt of cloth have very strong wetting property and the high-resistance to free oxidation base, the acting in conjunction of the functional group of the functional group of other elements and side chain and nitrogen element has more strengthened the wetting property of the honest rock asphalt of cloth and the high-resistance to free oxidation base.Make asphalt viscosity increase, oxidation-resistance strengthen, the adhesivity of particularly gathering materials and stripper-resistance be improved significantly.Compared with organic amine antistripping agent, its water resistant damage capability is more stable and durable.
The honest rock asphalt of cloth is as main starting material, and chemical structure and pitch in the honest rock of cloth are close, very good with bitumen compatibility, can form with matrix pitch " IPN founds network forming lattice ".
In the present invention, matrix pitch serves as the effect of a medium, and the performance of pitch is improved.
The preparation method of high performance modified bitumen of the present invention, comprises the steps:
(1) matrix pitch is heated to 160 ?180 ℃, deliver to and size mixing in tank;
(2) in the process stirring, honest cloth rock asphalt is added and in the tank of sizing mixing, carries out asphalt modification;
(3) modifying asphalt mix and blend 20 ?after 30 minutes, grind circulation, after mixing again finished product, enter hold-up vessel agitation cycle and store.
The device of preparing high performance modified bitumen of the present invention, comprise the tank of sizing mixing, tank upper end one side of sizing mixing arranges asphalt delivery band, opposite side arranges the first pitch pipeline, on the first pitch pipeline, the first heat-conducting oil pipes is set, size mixing tank lower end by the second pitch pipeline connection shredder, shredder is connected with hold-up vessel upper end by the 4th pitch pipeline, on the 4th pitch pipeline, the second heat-conducting oil pipes is set, hold-up vessel top and bottom are by the 5th pitch pipeline communication, the 3rd bitumenpump is set on the 5th pitch pipeline, the 3rd bitumenpump connects asphalt tank by the 6th pitch pipeline, on the 5th pitch pipeline near hold-up vessel bottom, the 9th heat-conducting oil pipes is set, on the 5th pitch pipeline near hold-up vessel top, the tenth heat-conducting oil pipes is set, the 7th heat-conducting oil pipes is set hold-up vessel one side and the 8th thermal oil goes out pipe, and the tank middle part of sizing mixing arranges the 3rd heat-conducting oil pipes and the 4th heat-conducting oil pipes, the 3rd heat-conducting oil pipes and the first pitch pipeline communication, the 4th heat-conducting oil pipes and the second pitch pipeline communication,
Wherein, all heat conducting oil pipes are individual layer pipeline, and all pitch pipelines are double-skin duct.
All heat conducting oil pipes are individual layer pipeline, and all pitch pipelines are the double-skin duct with thermal oil insulation, and internal layer is pitch passage, and outer city is thermal oil passage, and thermal oil plays the effect of insulation.
The tank upper end of sizing mixing arranges the first motor; Hold-up vessel upper end arranges the second motor.
Stopping valve is all set on all heat-conducting oil pipes, on all pitch pipelines, pitch stopcock is all set.
The tank lower end of sizing mixing arranges the 3rd pitch device for cleaning pipeline the 5th heat-conducting oil pipes excessively arranged side by side and the 6th heat-conducting oil pipes and the second pitch pipeline communication, on the 3rd pitch pipeline between the 5th heat-conducting oil pipes and the 6th heat-conducting oil pipes, the second pitch stopcock is set; Second pitch install pipeline the first pitch stopcock between the 5th heat-conducting oil pipes and the 6th heat-conducting oil pipes.
On the first pitch pipeline, the first bitumenpump is set; On the 4th pitch pipeline, the second bitumenpump is set.
The 3rd pitch pipeline is pitch blow-off line, is double wall tube.
Near on the 5th pitch pipeline of hold-up vessel bottom position, stopcock is set.
On the 9th heat-conducting oil pipes, stopping valve is set.
Hold-up vessel inner side is furnished with thermal oil coil pipe and is communicated with the 7th heat-conducting oil pipes and the 8th heat-conducting oil pipes; Size mixing tank inner side is furnished with thermal oil coil pipe and is communicated with the 3rd heat-conducting oil pipes and the 4th heat-conducting oil pipes.
In the time that heat-conducting oil pipes is connected with pitch pipeline, heat-conducting oil pipes all with the outer field thermal oil channel connection of pitch pipeline.
In use, there are three circulations in thermal oil, and three circulations are carried out simultaneously; The operation of pitch and the operation of thermal oil are independent of each other.
(1) pitch
Matrix pitch is passed through to the first bitumenpump, the first pitch pipeline, send into the tank of sizing mixing, after the honest rock asphalt of matrix pitch and cloth is uniformly mixed, entering shredder by the second pitch pipeline grinds, enter the second bitumenpump, by the 4th pitch pipeline hold-up vessel of entering, the a small amount of impurity of part is discharged by the 3rd pitch pipeline simultaneously, enter after hold-up vessel, enter in the asphalt tank of mixing station by the 3rd bitumenpump, and pitch can be entered in hold-up vessel by the 5th pitch pipeline, realize self circulation.
(2) thermal oil
Thermal oil enters from the first heat-conducting oil pipes, be incorporated into the skin of the first pitch pipeline by the stopping valve on pipeline, then flow to the 3rd heat-conducting oil pipes from the upper end of sizing mixing, enter the thermal oil coil pipe of the tank inside of sizing mixing by the stopping valve on pipeline, from the coil pipe of sizing mixing in tank out, then enter the 4th heat-conducting oil pipes, enter again the skin of the second pitch pipeline and the 3rd pitch pipeline, through the thermal insulation layer of shredder, the second bitumenpump, enter in the interlayer on the 4th pitch pipeline road, then enter the second heat-conducting oil pipes, get back to heat conducting oil boiler;
Thermal oil enters from the 7th heat-conducting oil pipes, then enters the coil pipe of hold-up vessel internal surface, enters the 8th heat-conducting oil pipes, then gets back to the boiler of thermal oil;
Thermal oil is entered the skin of the 5th pitch pipeline by the 9th heat-conducting oil pipes, then enter the tenth heat-conducting oil pipes from hold-up vessel top, finally gets back to heat conducting oil boiler.
The present invention has following feature:
(1) the present invention has obviously improved the hardness of pitch, compound high-temperature stability and cleavage strength are all improved to some extent, can meet the technical requirements of construction technique normalizing, low-temperature bending breaking strain can meet the technical indicator of Study on Climate Division from cold district to winter-warm syndrome district plain asphalt compound.
(2) add after the honest rock asphalt powder of cloth, asphalt is without increasing best asphalt content in the situation that of equal volume index, and the honest rock asphalt of the cloth of admixture can reduce the matrix pitch consumption of isodose.
(3) the modified asphalt mixture water stability adding after the honest rock asphalt powder of cloth meets the technical requirement of standard for stability of asphalt mixture.
In (4) 20% processes of rock asphalt modified asphalts, contain organic insolubles of high-content, this organic insolubles has certain particle size range, in mix-design process, will note the control to 0.075mm sieve aperture percent of pass; When construction, under thermosol state, should be noted that and strengthen taking stirring or other stabilizing measures to guarantee its homogeneity.Meanwhile, processing unit (plant), the complete processing of the honest rock modifying asphalt of wet-process modified cloth have a certain impact to its performance index also tool, therefore also should consider in use its complete processing.
(5) grating is the most important properties of asphalt Mineral Material, and it almost affects all key properties of asphalt, comprises even cracking resistance ability of stiffness, stability, weather resistance, construction workability, anti-fatigue ability, anti-slide performance.The honest rock modifying asphalt of cloth of Different adding amount, the technical indicator of its technical indicator and compound thereof is different, therefore when suggestion is used, should be according to concrete Study on Climate Division, road quality classification, engine request, the performance of gathering materials, matrix pitch index etc., adjust the addition of cloth Dun Yan and the level distribution structure of compound by test, and carry out proof test for the specific requirement on different road surfaces, pass through proof test, determine the feasibility in the application of bituminous pavement different layers position, to improve quality and to reduce costs.
(6) wet-process modified technology, can make modifying asphalt keeping or improving under the prerequisite of quality of matrix pitch, reduces costs.
Compared with prior art, the present invention has following beneficial effect:
The present invention adds after the honest rock asphalt powder of cloth, and asphalt is without increasing best asphalt content in the situation that of equal volume index, and the honest rock asphalt of the cloth of admixture can reduce the matrix pitch consumption of isodose.Be adsorbed on rock material surface energy high, there is good antistrip performance, softening temperature rutting resistance is high, stretching resistance, anti-aging oxidation susceptibility, water resistant damage capability and antimicrobial erosion action are strong, improve the driving comfort level of highway, extend highway work-ing life, environmental protection, good weatherability and cost are low, have good application value.Preparation method's flow process of the present invention is simple, efficiency improve, in mixing station use procedure, manufacture, make of limit on limit, prevent pitch repeatedly heat occur aging.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
In figure, 1. the tank of sizing mixing, 2. carrier bar, 3. shredder, 4-1. the first bitumenpump, 4-2. the second bitumenpump, 4-3. the 3rd bitumenpump, 5. hold-up vessel, 6-1. the first agitator motor, 6-2. the second agitator motor, 7-1. the first heat-conducting oil pipes, 7-2. the second heat-conducting oil pipes, 7-3. the 3rd heat-conducting oil pipes, 7-4. the 4th heat-conducting oil pipes, 7-5. the 5th heat-conducting oil pipes, 7-6. the 6th heat-conducting oil pipes, 7-7. the 7th heat-conducting oil pipes, 7-8. the 8th heat-conducting oil pipes, 7-9. the 9th heat-conducting oil pipes, 7-10. the tenth heat-conducting oil pipes, 8-1. the first pitch pipeline, 8-2. the second pitch pipeline, 8-3. the 3rd pitch pipeline, 8-4. the 4th pitch pipeline, 8-5. the 5th pitch pipeline, 8-6. the 6th pitch pipeline, 9-1. the first pitch stopcock, 9-2. the second pitch stopcock.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The matrix pitch using in embodiment is matrix pitch SK-70, and the honest rock asphalt of cloth using is to originate from Bu Dun island, the Indonesia southeast to draw the rock asphalt in viral mining area.The index of the honest rock asphalt of cloth is as table 1.
The honest rock asphalt basic index of table 1 cloth
Embodiment 1
High performance modified bitumen described in the present embodiment, by weight percentage, raw material is composed as follows:
Matrix pitch SK-70:80%, the honest rock asphalt of cloth: 20%.
The honest rock asphalt medium pitch of cloth weight content is 25%.
The median size of the honest rock asphalt powder of described cloth is 100 orders.
The preparation method of high performance modified bitumen is as follows:
1) matrix pitch SK-70 is heated to 160 ℃, is pumped into and sizes mixing in tank 1 by the first bitumenpump 4-1;
2) in the process stirring, honest cloth rock asphalt flight conveyor is slowly added in the tank 1 of sizing mixing and carries out asphalt modification;
3) modifying asphalt mix and blend 20 minutes, starts shredder 3 and the second bitumenpump 4-2, after grinding, obtains modifying asphalt finished product after mixing again, by the modifying asphalt mixing, is pumped into agitation cycle in hold-up vessel 5 and stores.
As Fig. 1, the device of preparing high performance modified bitumen described in the present embodiment, comprise the tank 1 of sizing mixing, tank 1 upper end one side of sizing mixing arranges asphalt delivery band 2, opposite side arranges the first pitch pipeline 8-1, on the first pitch pipeline 8-1, the first heat-conducting oil pipes 7-1 is set, size mixing tank 1 lower end by the second pitch pipeline 8-2 connection shredder 3, shredder 3 is connected with hold-up vessel 5 upper ends by the 4th pitch pipeline 8-4, on the 4th pitch pipeline 8-4, the second heat-conducting oil pipes 7-2 is set, hold-up vessel 5 top and bottom are communicated with by the 5th pitch pipeline 8-5, on the 5th pitch pipeline 8-5, the 3rd bitumenpump 4-3 is set, the 3rd bitumenpump 4-3 connects asphalt tank by the 6th pitch pipeline 8-6, on the 5th pitch pipeline 8-5 near hold-up vessel 5 bottoms, the 9th heat-conducting oil pipes 7-9 is set, on the 5th pitch pipeline 8-5 near hold-up vessel 5 tops, the tenth heat-conducting oil pipes 7-10 is set, the 7th heat-conducting oil pipes 7-7 is set hold-up vessel 5 one sides and the 8th thermal oil goes out to manage 7-8, tank 1 middle part of sizing mixing arranges the 3rd heat-conducting oil pipes 7-3 and the 4th heat-conducting oil pipes 7-4, and the 3rd heat-conducting oil pipes 7-3 is communicated with the first pitch pipeline 8-1, and the 4th heat-conducting oil pipes 7-4 is communicated with the second pitch pipeline 8-2,
Wherein, all heat conducting oil pipes are individual layer pipeline, and all pitch pipelines are double-skin duct.
All heat conducting oil pipes are individual layer pipeline, and all pitch pipelines are the double-skin duct with thermal oil insulation, and internal layer is pitch passage, and skin is thermal oil passage, and thermal oil plays the effect of insulation.
Tank 1 upper end of sizing mixing arranges the first motor 6-1; Hold-up vessel 5 upper ends arrange the second motor 6-2.
Stopping valve is all set on all heat-conducting oil pipes, on all pitch pipelines, pitch stopcock is all set.
Tank 1 lower end of sizing mixing arranges the 3rd pitch pipeline 8-3 and is communicated with the second pitch pipeline 8-2 by the 5th heat-conducting oil pipes 7-5 and the 6th heat-conducting oil pipes 7-6 arranged side by side, on the 3rd pitch pipeline 8-3 between the 5th heat-conducting oil pipes 7-5 and the 6th heat-conducting oil pipes 7-6, the second pitch stopcock 9-2 is set; The second pitch pipeline 8-2 between the 5th heat-conducting oil pipes 7-5 and the 6th heat-conducting oil pipes 7-6 arranges the first pitch stopcock 9-1.
On the first pitch pipeline 8-1, the first bitumenpump 4-1 is set; On the 4th pitch pipeline 8-4, the second bitumenpump 4-2 is set.
The 3rd pitch pipeline 8-3 is pitch blow-off line, is double wall tube.
Near on the 5th pitch pipeline 8-5 of hold-up vessel bottom position, stopcock is set.
On the 9th heat-conducting oil pipes 7-9, stopping valve is set.
Hold-up vessel 5 inner sides are furnished with thermal oil coil pipe and are communicated with the 7th heat-conducting oil pipes 7-7 and the 8th heat-conducting oil pipes 7-8; Tank 1 inner side of sizing mixing is furnished with thermal oil coil pipe and is communicated with the 3rd heat-conducting oil pipes 7-3 and the 4th heat-conducting oil pipes 7-4.
In use, there are three circulations in heat-conducting oil pipes, and three circulations are carried out simultaneously; The operation on pitch pipeline road and the operation of thermal conductive oil pipeline are independent of each other.
(1) pitch
Matrix pitch SK-70 is passed through to the first bitumenpump 4-1, the first pitch pipeline 8-1, send into the tank 1 of sizing mixing, after the honest rock asphalt of matrix pitch SK-70 and cloth is uniformly mixed, entering shredder 3 by the second pitch pipeline 8-2 grinds, enter the second bitumenpump 4-2, by the 4th pitch pipeline 8-4 hold-up vessel 5 of entering, the a small amount of impurity of part is discharged by the 3rd pitch pipeline 8-3 simultaneously, enter after hold-up vessel 5, enter in the asphalt tank of mixing station by the 3rd bitumenpump 4-3, and pitch can be entered in hold-up vessel 5 by the 5th pitch pipeline 8-5, realize self circulation.
(2) thermal oil
Thermal oil enters from the first heat-conducting oil pipes 7-1, be incorporated into the skin of the first pitch pipeline 8-1 by the stopping valve on pipeline, then flow to the 3rd heat-conducting oil pipes 7-3 from tank 1 top of sizing mixing, enter the thermal oil coil pipe of tank 1 inside of sizing mixing by the stopping valve on pipeline, from the coil pipe of sizing mixing in tank 1 out, then enter the 4th heat-conducting oil pipes 7-4, enter again the skin of the second pitch pipeline 8-2 and the 3rd pitch pipeline 8-3, through shredder 3, the thermal insulation layer of the second bitumenpump 4-2, enter in the interlayer of the 4th pitch pipeline road 8-4, then enter the second heat-conducting oil pipes 7-2, get back to heat conducting oil boiler,
Thermal oil enters from the 7th heat-conducting oil pipes 7-7, then enters the coil pipe of hold-up vessel 5 internal surfaces, enters the 8th heat-conducting oil pipes 7-8, then gets back to the boiler of thermal oil;
Thermal oil is entered the skin of the 5th pitch pipeline 8-5 by the 9th heat-conducting oil pipes 7-9, then enter the tenth heat-conducting oil pipes 7-10 from hold-up vessel 5 tops, finally gets back to heat conducting oil boiler.
Embodiment 2
High performance modified bitumen described in the present embodiment, by weight percentage, raw material is composed as follows:
Matrix pitch SK-70:75%, the honest rock asphalt of cloth: 25%.
The honest rock asphalt medium pitch of cloth weight content is 30%.
The median size of the honest rock asphalt powder of described cloth is 60-100 order.
The preparation method of high performance modified bitumen is as follows:
1) matrix pitch SK-70 is heated to 170 ℃, is pumped into and sizes mixing in tank 1 by the first bitumenpump 4-1;
2) in the process stirring, honest cloth rock asphalt is slowly added in the tank 1 of sizing mixing and is carried out asphalt modification by flight conveyor;
3) modifying asphalt mix and blend 25 minutes, starts shredder 3 and the second bitumenpump 4-2, grinds, and obtains modifying asphalt finished product after mixing again, by the modifying asphalt mixing, is pumped into agitation cycle in hold-up vessel 5 and stores.
The apparatus structure of preparing high performance modified bitumen of the present embodiment and embodiment 1 and use step thereof are identical.
Embodiment 3
High performance modified bitumen described in the present embodiment, by weight percentage, raw material is composed as follows:
Matrix pitch SK-70:70%, the honest rock asphalt of cloth: 30%.
The honest rock asphalt medium pitch of cloth weight content is 20%.
The median size of the honest rock asphalt powder of described cloth is 60-100 order.
The preparation method of high performance modified bitumen is as follows:
1) matrix pitch SK-70 is heated to 180 ℃, is pumped into and sizes mixing in tank 1 by the first bitumenpump 4-1;
2) in the process stirring, honest cloth rock asphalt is slowly added in the tank 1 of sizing mixing and is carried out asphalt modification by flight conveyor;
3) modifying asphalt mix and blend 30 minutes, starts shredder 3 and the second bitumenpump 4-2, after grinding, obtains modifying asphalt finished product after mixing again, by the modifying asphalt mixing, is pumped into agitation cycle in hold-up vessel 5 and stores.
The apparatus structure of preparing modifying asphalt of the present embodiment and embodiment 1 and use step thereof are identical.
The detection to embodiment 1 below:
1, the component of modifying asphalt mixes and storage-stable situation, the honest rock asphalt of matrix pitch SK-70 and cloth is at the interior insulation of hold-up vessel 5 1h, 2h, 3h, 4h and start to construct before 15h respectively on hold-up vessel 5 inner face height 1/3 and bottom 1/3 place sampling, record not very large difference of softening point difference, density is less, along with holding time, rock asphalt mixes with matrix pitch SK-70 better, the obvious segregation not occurring, along with holding time rock asphalt is dissolved in matrix pitch SK-70 better.
In matrix pitch SK-70 and embodiment 1, the detected result of product is as shown in table 2.
The detected result of product in table 2 matrix pitch SK-70 and embodiment 1
In solubility experiment, insolubles particle diameter is larger, easily stops up filter paper, and this report has adopted whizzer to carry out solubility test.
Experimental phenomena and result show:
High performance modified bitumen in embodiment 1 can obviously improve the hardness of pitch, has certain effect at aspects such as high temperature.Compared with matrix pitch SK-70, softening temperature raise, penetration degree obviously declines, penetrative index increases substantially, temperature sensitivity be improved significantly; Softening temperature and viscosity increased.
2, asphalt mixture gradation design
According to mineral aggregate composition design result, adopt gyratory compaction method to adopt 4.1%, 4.4%, 4.7% asphalt content to carry out the optimization of asphalt content to selected grating.Adopt surface drying method test test specimen, select optimum asphalt content according to test specimen volume index.Final definite optimum asphalt content is 4.3%.Wherein, adopt mineral aggregate to adopt limestone aggregates in gradation design, stopping composition is limestone breeze.The mineral aggregate screening result that adopts as table 3, it is as shown in table 5 that building stones density the results are shown in Table 4, AC-20 formate gradation composition, the volume index of AC-20 asphalt is as table 6.The organic insolubles that contains high-content in the honest rock modifying asphalt of cloth, for soaked into the mineral such as the calcium carbonate of modification by rock asphalt, selects the percent of pass that reduces 0.075mm sieve aperture on the basis of normal grating.
Table 3 mineral aggregate screening result
Table 4 building stones density result
Table 5AC-20 formate gradation composition
| Size of mesh/mm | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Formate gradation composition/% | 100.0 | 95.8 | 86.4 | 77.0 | 61.5 | 36.9 | 25.2 | 18.2 | 11.1 | 6.9 | 5.7 | 4.3 |
| The grating upper limit/% | 100.0 | 90.0 | 83.0 | 73.0 | 56.0 | 35.0 | 22.0 | 15.0 | 10.0 | 6.0 | 5.0 | 4.0 |
| Grating lower limit/% | 100.0 | 100.0 | 95.0 | 86.0 | 70.0 | 48.0 | 33.0 | 23.0 | 16.0 | 11.0 | 9.0 | 6.0 |
| Grating intermediate value/% | 100 | 95 | 89 | 79.5 | 63 | 41.5 | 27.5 | 19 | 13 | 8.5 | 7 | 5 |
The volume index of table 6AC-20 asphalt
| Test subject | Result | Technical requirements |
| Voidage VV, % | 4.0 | 4.0 |
| Void in mineral aggregate VMA, % | 13.4 | Be not less than 13.0 |
| Pitch saturation ratio VFA, % | 70.4 | 65－75 |
Adopt the asphalt content that grating is 4.3%, the product of embodiment 1 carried out to performance evaluation, evaluate as follows:
1, high-temperature stability
High-temperature stability adopts dynamic stability wheel tracking test and two kinds of test methods of hamburger rut test to evaluate.
(1) dynamic stability wheel tracking test
Wheel tracking test is on the same track of plate-like test specimen, to do repeatedly rolling of certain hour with bearing a constant load wheel, make test block under the Repeated Loading of wheel, produce densification, shearing, passing and flow, form rut groove, and evaluate asphalt and resist a kind of test method of plastic flow deformation ability with rut depth deformation rate RD and dynamic stability DS under specified temperature.The product of embodiment 1 is divided into test specimen 1, test specimen 2 and test specimen 3 and detects, detected result is as table 7, and to test specimen 1 at Different climate subregion dynamic stability wheel tracking test, detected result is as table 8.
Table 7 dynamic stability wheel tracking test result
Table 8 test specimen 1 is in Different climate subregion dynamic stability wheel tracking test result
| Study on Climate Division | The DS of plain asphalt compound | The DS of modified asphalt mixture |
| 1-3 | Be not less than 1000, inferior/mm | Be not less than 2800, inferior/mm |
| 2-1 | Be not less than 600, inferior/mm | Be not less than 2000, inferior/mm |
| 2-2 | Be not less than 800, inferior/mm | Be not less than 2400, inferior/mm |
Dynamic stability wheel tracking test result shows, the modified asphalt mixture high-temperature stability of the honest rock asphalt of admixture cloth is far above the technical requirement for plain asphalt compound in technical specifications, and can meet the technical requirement of each Study on Climate Division for modified asphalt mixture.Hamburger rut test result also shows, the present invention meets bituminous cements PG76 class requirement, and does not occur peeling off flex point, has good water stability.
(2) hamburger rut test
Hamburger rut test is for measuring water stability and the anti-rut performance of asphalt.Hamburger rut test carries out with reference to the test method of AASHTO T324 and Texas, USA Tex-242-F.50 ℃ of hamburger rut test water temperatures, fixed load 685N, wheel pressure 0.73MPa, rolls number of times 20000 times.(TxDOT) highway construction of Texas the Ministry of Communications and norms of mainteaance propose corresponding index request according to the PG grade of bituminous cements, and index request is as shown in table 8.The product of embodiment 1 gets test specimen 1 and test specimen 2 carries out after the high test specimen of gyratory compaction molding, cutting and forming in the specimen chamber of hamburger, and thickness is 6cm, and hamburger test-results of test specimen 1 and test specimen 2 is as table 9.
The rut test requirement of hamburger, table 9 Texas
| Bituminous cements grade | While rolling following number of times, the rut degree of depth is not 50 ℃ higher than 12.7mm(test temperature) |
| PG64 or lower | 10000 |
| PG70 | 15000 |
| PG76 or higher | 20000 |
Table 10 hamburger rut test result
2, low-temperature performance
The product of embodiment 1 is cut into long 250mm ± 2.0mm, wide 30mm ± 2.0mm, the prism girder of high 35mm ± 2.0mm, it is 200mm ± 0.5mm across footpath, carry out cold performance test, wherein test temperature is-10 ± 0.5 ℃, and loading rate is 50mm/min, forming method is rolling moulding, and experimental result is as table 10.
Table 11 cold performance test result
| ? | Sample dimensions/(mm × mm) | Breaking strain/μ ε | Flexural tensile strength/MPa | Stiffness modulus/MPa |
| Embodiment 1 | 30.81*35.33 | 2654.8 | 7.87 | 2962.85 |
Asphalt Mixture at Low Temperature pliability test breaking strain (μ ε) technical requirements winter severe cold district >=2600, cold district >=2300, winter cold-zone >=2000 winter-warm syndrome district >=2000.
The low-temperature bending breaking strain of the modified asphalt mixture of the honest rock asphalt of admixture cloth can meet the requirement of Ji Dong cold-zone, cold district.
3, water stability
Freeze thawing split test is that a kind of compound test specimen of measuring is being subject to the strength ratio of front and back cleavage fracture of Moisture Damage, is another method of evaluating compound water stability.The clearance gap that first this test makes water fully enter test specimen under vacuum condition is then carried out freezing by test specimen under-18 ℃ of conditions; Because water freezing volume in space in refrigerating process increases, asphalt membrane is produced to pressure, simultaneously because asphalt membrane under cold condition becomes fragile, plastic deformation ability weakens, and easily produces and breaks like this under the acting in conjunction of pressure; When test specimen is put into after 60 ℃ of water-baths, ice melts again as water, by some water along the crack of asphalt membrane enter gather materials and asphalt membrane between, destruction gather materials and asphalt membrane between cohesive action, simultaneously due to ice become water after volume reduce, the pressure of asphalt membrane is disappeared, and gathers materials during with respect to pressure-acting and the reducing of asphalt membrane spacing, the disappearance of pressure will make this spacing be tending towards recovering and then increasing, be equivalent to gather materials and asphalt membrane between under tension again; Along with the rising of water temperature, the volume of water reexpands and mineralization pressure, afterwards test specimen is put into again to 25 ℃ of water-baths, and the volume of water reduces again and continue to produce pulling force.
This frozen-thaw process has well been simulated interstitial water squeeze and destroy effect to asphalt membrane under Driving Loading on actual road surface.
This time design adopts freeze thawing split test to check compound water stability, to matrix pitch SK-70 and embodiment 1 freeze thawing split test detected result and correlation data in table 11.
Table 12 freeze thawing split test result and contrast
| ? | Matrix pitch SK-70 | Embodiment 1 |
| Intensity before freeze thawing | 1.03 | 1.21 |
| Intensity after freeze thawing | 0.82 | 0.99 |
| TSR% | 79.6 | 82.3 |
| The TSR% of humidity, humid area | ≥75% | ≥80 |
| The TSR% of half-dried, arid biogeographic zone | ≥70% | ≥75 |
Claims (9)
1. a high performance modified bitumen, is characterized in that, by weight percentage, raw material is composed as follows:
Matrix pitch: 70-80%, the honest rock asphalt 20-30% of cloth, the honest rock asphalt Asphalt Content of wherein said cloth is 20-30%.
2. high performance modified bitumen according to claim 1, is characterized in that, by weight percentage, raw material is composed as follows:
Matrix pitch: 80%, the honest rock asphalt 20% of cloth, the honest rock asphalt Asphalt Content of wherein said cloth is 20-30%.
3. a preparation method for high performance modified bitumen claimed in claim 1, is characterized in that, comprises the steps:
1) matrix pitch is heated to 160-180 ℃, delivers in the tank of sizing mixing (1);
2) in the process stirring, honest cloth rock asphalt is added in the tank of sizing mixing (1) and carries out asphalt modification;
3) after modifying asphalt mix and blend 20-30 minute, grind circulation, after mixing again, obtain finished product, enter hold-up vessel (5) agitation cycle and store.
4. prepare the device of high performance modified bitumen claimed in claim 1 for one kind, comprise the tank of sizing mixing (1), it is characterized in that, tank (1) upper end one side of sizing mixing arranges transporting chain plate (2), opposite side arranges the first pitch pipeline (8-1), on the first pitch pipeline (8-1), the first heat-conducting oil pipes (7-1) is set, size mixing tank (1) lower end by the second pitch pipeline (8-2) connection shredder (3), shredder (3) is connected with hold-up vessel (5) upper end by the 4th pitch pipeline (8-4), on the 4th pitch pipeline (8-4), the second heat-conducting oil pipes (7-2) is set, hold-up vessel (5) top and bottom are communicated with by the 5th pitch pipeline (8-5), the 3rd bitumenpump (4-3) is set on the 5th pitch pipeline (8-5), the 3rd bitumenpump (4-3) connects mixing station asphalt tank by the 6th pitch pipeline (8-6), on the 5th pitch pipeline (8-5) near hold-up vessel (5) bottom, the 9th heat-conducting oil pipes (7-9) is set, on the 5th pitch pipeline (8-5) near hold-up vessel (5) top, the tenth heat-conducting oil pipes (7-10) is set, the 7th heat-conducting oil pipes (7-7) is set hold-up vessel (5) one sides and the 8th thermal oil goes out pipe (7-8), size mixing tank (1) middle part arranges the 3rd heat-conducting oil pipes (7-3) and the 4th heat-conducting oil pipes (7-4), and the 3rd heat-conducting oil pipes (7-3) is communicated with the first pitch pipeline (8-1), and the 4th heat-conducting oil pipes (7-4) is communicated with the second pitch pipeline (8-2), wherein, all heat-conducting oil pipes are mono-layer tube, and all pitch pipelines are double wall tube.
5. the device of preparing high performance modified bitumen according to claim 4, is characterized in that, the tank of sizing mixing (1) upper end arranges the first motor (6-1); Hold-up vessel (5) upper end arranges the second motor (6-2).
6. the device of preparing high performance modified bitumen according to claim 4, is characterized in that, stopping valve is all set on all heat-conducting oil pipes, on all pitch pipelines, pitch stopcock is all set.
7. the device of preparing high performance modified bitumen according to claim 4, it is characterized in that, tank (1) lower end of sizing mixing arranges the 3rd pitch pipeline (8-3) and is communicated with the second pitch pipeline (8-2) by the 5th heat-conducting oil pipes (7-5) and the 6th heat-conducting oil pipes (7-6) arranged side by side, on the 3rd pitch pipeline (8-3) between the 5th heat-conducting oil pipes (7-5) and the 6th heat-conducting oil pipes (7-6), the second pitch stopcock (9-2) is set; The second pitch pipeline (8-2) between the 5th heat-conducting oil pipes (7-5) and the 6th heat-conducting oil pipes (7-6) arranges the first pitch stopcock (9-1).
8. the device of preparing high performance modified bitumen according to claim 4, is characterized in that, on the first pitch pipeline (8-1), the first bitumenpump (4-1) is set; On the 4th pitch pipeline (8-4), the second bitumenpump (4-2) is set.
9. the device of preparing high performance modified bitumen according to claim 4, is characterized in that, hold-up vessel (5) inner side is furnished with thermal oil coil pipe and is communicated with the 7th heat-conducting oil pipes (7-7) and the 8th heat-conducting oil pipes (7-8); Size mixing tank (1) inner side is furnished with thermal oil coil pipe and is communicated with the 3rd heat-conducting oil pipes (7-3) and the 4th heat-conducting oil pipes (7-4).
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