CN110068672A - A kind of experimental rig and test method measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture - Google Patents
A kind of experimental rig and test method measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture Download PDFInfo
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Abstract
The invention discloses a kind of experimental rigs and test method for measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture, the experimental rig is mainly made of control system, heating and attemperator and screening plant, test method utilizes above-mentioned experimental rig, prepare according to test, measurement and result arrange three steps and carry out, pass through mixing heat regeneration asphalt mixture and plain asphalt mixture, it is sieved again through rotary screen, the Mass Calculation that the upper fine grained mineral aggregate that newly gathers materials is attached on finally by comparative determination obtains its extent of migration.The test result that above-mentioned experimental rig and test method measure quickly, accurately, reliably, for the transition state and Transport of old mineral aggregate particle under research different condition provides foundation, can promote the promotion and application of heat regeneration asphalt pavement technique.
Description
Technical field
The invention belongs to the heat regeneration asphalt pavement technique fields of urban road, airport roadway and highway etc., and in particular to
A kind of experimental rig and test method measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture.
Background technique
The current high-grade highway in China is via the stage of " construction period " entrance " construction is laid equal stress on maintenance ", 90% road
Face structure is all made of asphalt pavement structure form, and design period is generally 12~15 years, and every annual meeting generates close in maintenance processes
Hundred million tons of waste asphalt mixture.The stacking of waste asphalt mixture not only occupies a large amount of land resource, but also causes
Serious environmental pollution, Applied of Asphalt Pavement Recycle Technique pass through recycling waste asphalt mixture (predominantly mineral aggregate and pitch),
It can achieve the purpose for economizing on resources and preserving the ecological environment.In Applied of Asphalt Pavement Recycle Technique, application efficiency, application quality are most
It is high and what is be most widely used is hot in-place recycling.
It is limited by existence conditions, in heat regeneration asphalt mixture production process, due to recycling asphalt pavement material
(RAP) the thickness mineral aggregate particle in passes through Bituminous concrete surface tight bond, wraps, and old mineral aggregate can not completely disengage Bituminous concrete surface constraint, real
Existing free migration and with new mineral aggregate uniform mixing, this meeting is and pre- so that the practical mineral aggregate gradation of heat regeneration asphalt mixture is partially thick
The design level of phase, which is matched, not to be inconsistent.The result will lead to that molding heat regeneration asphalt road surface compactness is poor, and infiltration coefficient is bigger than normal, be easy
Occur early disease, and then influence road service life, therefore during Accurate Determining hot recycling old mineral aggregate extent of migration,
Being modified in turn using measure to gradation becomes extremely important.
There is researcher to gather materials using magnetic iron ore at present to mix and stir as newly gathering materials with RAP, it is mixed to prepare heat regeneration asphalt
Close material, then by magnet by it is new and old gather materials separate, finally by extracting or combustion method, sieve test, and then measure old mine
The extent of migration of material, applicant analyze above-mentioned test method and have the following deficiencies: (1) magnetic iron ore on the basis of a large number of experiments
Materials of gathering materials and processing difficulties, higher cost, it is difficult to be widely used in engineering；(2) extracting or combustion method test are time-consuming and laborious,
Operating difficulties, and need by more complicated calculating process, it can not directly and quickly obtain test data.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide one kind can measure the old mineral aggregate of heat regeneration asphalt mixture
The experimental rig and test method of extent of migration can quickly measure plantmix by the device and method or in-situ heat regeneration mix
Extent of migration index of the old mineral aggregate in regenerative process in material.
A kind of experimental rig measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture, by control system, heating and guarantor
Warm device and screening plant composition；The heating is used to heat screening plant and keep the temperature, the control system with attemperator
System is for heating the acquisition and processing of control and data with attemperator and screening plant.
The screening plant includes rotary screen 101A and 101B, motor 109, frequency converter 111, drive rod 108, matter
Tester 103A and 103B, screenings discharge port 104A and 104B, sieve mixture, isolate the mine of different-grain diameter
Material.
The control system is by general supply 114, data processing and control unit 115, heating control module 112 and screening
Control unit 113 forms；The general supply is powered and controls to entire experimental rig；The data processing and control
Unit 115 can receive and show the information of acquisition, and carry out data processing and control；The heating control module 112 with
Heating is connect with attemperator, controls the heating temperature of mixture；The screening control unit 113 is connect with screening plant,
Control the starting and closing, revolving speed of screening plant.
The data processing is made of with control unit 115 infrared radiation thermometer 116, quality tester 103A and 103B,
Infrared radiation thermometer 116 is used to measure the temperature of heat regeneration asphalt mixture in test；Quality tester 103A and 103B are for surveying
The fixed mixture quality by sieve pore.
A kind of test method using the said sample device measurement old mineral aggregate extent of migration of heat regeneration asphalt mixture, including
Following steps:
(1) test prepares
1. rotary screen 101A and 101B used is the square hole screen of 4.75mm；
2. weighing newly gathering materials for the partial size > 4.75mm dried according to needed for mixing 3~5kg asphalt, then setting baking
Be heated to mixing and stirring in case 15 DEG C of temperature or more it is spare；
3. according to the new Bituminous concrete surface total content P of hot recycling mixturebThe pitch needed is calculated, pitch, regenerative agent sample are taken, is used
Baking oven is heated to defined asphalt and mixes and stirs temperature；
4. the bitumen content for weighing partial size≤4.75mm RAP, RAP is Pob, mixture proportion n, RAP is placed in baking oven plus
For heat to 110 DEG C, heating time no more than 2h, avoids the further aging of RAP；
(2) it measures
Asphalt mixer is preheated to by S1 in advance mixes and stirs 10 DEG C of temperature or more；
Newly gathering materials for heating is placed in mixer by S2, is properly mixed with small scoop；Then the RAP for needing quantity, new drip is added
Blueness starts mixer and makes to mix and stir while stirring and mixes and stirs until uniformly in blade insertion mixture；
S3 pours into the heat regeneration asphalt mixture of uniform mixing in plastic pallet, uniformly spreads out, is cooled to room temperature；
S4 is added using newly the gathering materials of phase homogenous quantities, pitch and RAP phase homogenous quantities and the new mineral aggregate of gradation and pitch is replaced
RAP pours into plastics according to the plain asphalt mixture of identical mix condition mixing proportion identical as heat regeneration asphalt mixture
It in pallet, uniformly spreads out, is cooled to room temperature；
S5 opens general supply, weighs the quality of heat regeneration asphalt mixture and plain asphalt mixture, respectively m1AAnd m1B, will
It is separately put into two rotation screen drums, and being set as heating temperature is 70 DEG C, sieving time 5min, and rotary screen revolving speed is 30r/
Min starts heating device, when material temperature degree to be mixed reaches set temperature, opens screening plant；
After the completion of S6 is to be sieved, record passes through the heat regeneration asphalt mixture of sieve pore and the quality m of plain asphalt mixture2AWith
m2B；
(3) result arranges
The extent of migration of heat regeneration asphalt mixture indicates that dimensionless is calculated according to following formula with λ:
In formula:
λ --- the extent of migration of the old mineral aggregate of heat regeneration asphalt mixture, dimensionless；
m2A--- pass through the quality of the heat regeneration asphalt mixture of sieve pore, kg；
m2B--- pass through the quality of the plain asphalt mixture of sieve pore, kg；
Pb--- the new Bituminous concrete surface total content of hot recycling mixture, %；
Pob--- the bitumen content in RAP, %；
N --- RAP mix ratio, dimensionless；
m1A--- the gross mass of heat regeneration asphalt mixture, kg；
m1B--- the gross mass of plain asphalt mixture, kg.
Experimental rig of the present invention is mainly made of control system, heating and attemperator and screening plant, test method
Using above-mentioned experimental rig, prepare according to test, three steps progress of measurement and result arrangement, it is mixed by mixing heat regeneration asphalt
Material and plain asphalt mixture are closed, then is sieved through rotary screen, the upper fine grained mineral aggregate that newly gathers materials is attached on finally by comparative determination
Mass Calculation obtain its extent of migration.
According to the size of sieve, pitch mixing heat is added again in newly gathering materials for partial size≤4.75mm RAP and > 4.75mm
Raw asphalt, recycles the rotary screen having a size of 4.75mm sufficiently to be sieved under conditions of 70 DEG C, weighs and pass through
Sieve, i.e. partial size≤4.75mm mixture quality, are moved according to the old mineral aggregate that formula can calculate during mixing and stirring in RAP
Move to the quality and ratio of new surface of aggregate；In the case where other conditions are constant, by same size and gradation new mineral aggregate and
Pitch replaces RAP, adds pitch, the new mixing plain asphalt mixture that gathers materials, is equally sieved, available common mixing
Fine grained mineral aggregate is migrated to the quality on coarse aggregate surface and ratio in material；It can finally calculate old in heat regeneration asphalt mixture
The extent of migration of mineral aggregate.
The invention has the following advantages that
(1) simple process reduces environmental pollution
The present invention using rotary screen by partial size difference can quick separating newly gather materials and old mineral aggregate, recycle Mass Calculation thin
The migration ratio of the old mineral aggregate of grain, on the one hand, can save experimentation cost to avoid special material is used, be also beneficial to the test side
The a wide range of promotion and application of method；On the other hand pitch is removed without extracting or combustion method, avoids the toxic materials such as three filter ethylene
While to injury of human, environmental pollution is also mitigated；
(2) test result is stable, reliable
Experimental rig of the present invention and test method are reduced pitch viscosity, are sieved by the temperature of asphalt when control screening
It is point more thorough, the accuracy of test data is improved, test operation is simple, easy, and test result is stable, reliably.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention, in which: 101 rotary screens, 102 rotary screen handles, 103 mass measurements
Instrument, 104 screenings discharge ports, 105 cavity heat insulation walls, 106 cylinders, 107 driving disks, 108 drive rods, 109 motor, 110
Bracket, 111 frequency converters, 112 heating control modules, 113 screening control units, 114 general supplies, 115 data processings and control are single
Member, 116 infrared radiation thermometers, 117 heating members, 118 insulating layers；
Fig. 2 is side view of the invention, in which: 119 radiator-grids, 120 switch handles, 121 screenings discharge port switch handles.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, structural schematic diagram of the invention is mainly by control system, heating and attemperator and screening plant
Composition, control system are single by general supply 114, data processing and control unit 115, heating control module 112, screening revolving speed control
The control modules such as member 113 composition, general supply 114 are powered and control to entire experimental rig；Data processing and control unit
115 are made of infrared radiation thermometer 116, quality tester 103 etc., and infrared radiation thermometer 116 is for measuring heat regeneration asphalt in test
The temperature of mixture；Quality tester 103 is used to measure the mixture quality by sieve pore；Data processing and control unit 115
It can receive and show the information of acquisition, and carry out data processing and control, heating control module 112 and heating member 117 and guarantor
Warm layer 118 connects, and controls the heating temperature of heat regeneration asphalt mixture；Sieve the frequency conversion in control unit 113 and screening plant
Device 111 and motor 109 connect, and control starting and closing, revolving speed size of screening plant etc.；Bracket 110 is used to fix and prop up
Support entire instrument；Motor 109 provides power for screening plant, is adjusted in screening plant by screening control unit 113
Frequency converter 111, engine drive the rotary screen 101 for being fixed on cylinder 106 to rotate by drive rod 108 and driving disk 107, rotation
Turning sieve 101 is the square hole screen having a size of 4.75mm, can sieve to the asphalt being put into, pass through the mixing of sieve
Material can survey its quality by the mass measurer 103 of 104 bottom of screenings discharge port, and rotary screen handle 102, which can be convenient, to be mixed
Material pours into, and screenings discharge port handle 121, which facilitates, takes out the mixture after test.
When measuring the old mineral aggregate extent of migration of heat regeneration asphalt mixture, general supply 114 should be opened first, claim to obtain hot recycling
Quality of asphalt mixtures (m1A) and common material (m1B), the switch handle 120 outside instrument is opened, respectively mixes heat regeneration asphalt
It closes material and expects that pouring into 101A, 101B two rotates in screen drum, observes data processing and control unit 115 at this time, can show with common
Real time temperature, and part pass through the quality of the mixture of sieve；Heating control module 112 is opened, whether observation real time temperature reaches
To 70 DEG C, when temperature reaches 70 DEG C, screening control unit 113 is opened, screening revolving speed and time are set in 30r/min,
5min is sieved；The mixing by rotary screen 101 shown in data processing and control unit 115 is remembered after screening
Expect quality m2A,m2B, then by m1A、m1B、m2A、m2BEqual reference records are got off；Finally, it is mixed to be calculated from the formula heat regeneration asphalt
It closes and expects old mineral aggregate extent of migration.The experimental rig can also control different variables to measure different extraneous factors for hot recycling
The influence of the old mineral aggregate extent of migration of asphalt.Such as by operation screening control unit 113 come control sifting barrel revolving speed and
Time controls the temperature of screening by operation heating control module 112.
The embodiment of test method:
For verifying the present invention measurement the old mineral aggregate extent of migration of heat regeneration asphalt mixture experimental rig and test method it is reliable
Property and beneficial effect, below with reference to embodiment, the present invention is described in more detail, but the present invention is not limited to following embodiments.
Specific test procedure is as follows:
Embodiment 1
Technical solution according to the invention, the present embodiment provide a kind of measurement heat regeneration asphalt mixture old mineral aggregate extent of migration
Test method, by taking AC-13C type heat regeneration asphalt mixture as an example, the volume of RAP is 20%, determines RAP's by extraction test
Bitumen content is 3.2%, through heat regeneration asphalt mixture mix-design, determines that asphalt optimum content is 4.9%.
(1) test prepares
1. then setting baking oven according to newly gathering materials for the partial size > 4.75mm dried is weighed needed for mixing 3~5kg asphalt
In be heated to mixing and stirring 15 DEG C of temperature or more it is spare.
2. calculating the pitch needed according to the new Bituminous concrete surface total content 4.8% of hot recycling mixture, pitch, regenerative agent examination are taken
Sample is heated to defined asphalt with baking oven and mixes and stirs temperature.
3. the bitumen content for weighing partial size≤4.75mm RAP, RAP is 3.2%, RAP is placed in baking oven by mixture proportion 20%
In be heated to 110 DEG C, heating time no more than 2h, avoids the further aging of RAP.
(2) it measures
10 DEG C of temperature or more are mixed and stirred 1. asphalt mixer is preheated in advance.
2. newly gathering materials for heating is placed in mixer, properly mixed with small scoop；Then be added need quantity RAP,
New pitch starts mixer and makes to mix and stir while stirring and mixes and stirs until uniformly in blade insertion mixture.
3. the heat regeneration asphalt mixture of uniform mixing is poured into plastic pallet, uniformly spread out, is cooled to room temperature；
4. adding using newly the gathering materials of phase homogenous quantities, pitch and RAP phase homogenous quantities and the new mineral aggregate of gradation and pitch replacing
RAP pours into plastics according to the plain asphalt mixture of identical mix condition mixing proportion identical as heat regeneration asphalt mixture
It in pallet, uniformly spreads out, is cooled to room temperature.
5. opening general supply, the quality of heat regeneration asphalt mixture and plain asphalt mixture, respectively 2.00kg are weighed
And 2.50kg, it is separately put into two rotation screen drums, being set as heating temperature is 70 DEG C, sieving time 5min, rotation
Sieve revolving speed is 30r/min, starts heating device, when material temperature degree to be mixed reaches set temperature, opens screening plant.
6. after the completion of to be sieved, record passes through the heat regeneration asphalt mixture of sieve pore and the quality of plain asphalt mixture
0.36kg and 0.41kg.
(3) result arranges
The extent of migration of heat regeneration asphalt mixture indicates that dimensionless is calculated according to following formula with λ:
In formula:
λ --- the extent of migration of the old mineral aggregate of heat regeneration asphalt mixture, no guiding principle amount；
m2A--- pass through the quality of the heat regeneration asphalt mixture of sieve pore, kg；
m2B--- pass through the quality of the plain asphalt mixture of sieve pore, kg；
Pb--- the new Bituminous concrete surface total content of hot recycling mixture, %；
Pob--- the bitumen content in RAP, %；
N --- RAP mix ratio, dimensionless；
m1A--- the gross mass of heat regeneration asphalt mixture, kg；
m1B--- the gross mass of plain asphalt mixture, kg；
Extent of migration λ=59% of the old mineral aggregate of heat regeneration asphalt mixture is finally calculated.
Embodiment 2
Technical solution according to the invention, the present embodiment provide a kind of measurement heat regeneration asphalt mixture old mineral aggregate extent of migration
Test method, by taking AC-13C type heat regeneration asphalt mixture as an example, the volume of RAP is 30%, determines RAP's by extraction test
Bitumen content is 3.2%, through heat regeneration asphalt mixture mix-design, determines that asphalt optimum content is 4.8%.
(1) test prepares
1. then setting baking oven according to newly gathering materials for the partial size > 4.75mm dried is weighed needed for mixing 3~5kg asphalt
In be heated to mixing and stirring 15 DEG C of temperature or more it is spare.
2. according to the new Bituminous concrete surface total content P of hot recycling mixturebThe pitch needed is calculated, pitch, regenerative agent sample are taken,
Defined asphalt, which is heated to, with baking oven mixes and stirs temperature.
3. the bitumen content for weighing partial size≤4.75mm RAP, RAP is 3.2%, RAP is placed in baking by mixture proportion 30%
110 DEG C are heated in case, heating time no more than 2h, avoids the further aging of RAP.
(2) it measures
10 DEG C of temperature or more are mixed and stirred 1. asphalt mixer is preheated in advance.
2. newly gathering materials for heating is placed in mixer, properly mixed with small scoop；Then be added need quantity RAP,
New pitch starts mixer and makes to mix and stir while stirring and mixes and stirs until uniformly in blade insertion mixture.
3. the heat regeneration asphalt mixture of uniform mixing is poured into plastic pallet, uniformly spread out, is cooled to room temperature；
4. adding using newly the gathering materials of phase homogenous quantities, pitch and RAP phase homogenous quantities and the new mineral aggregate of gradation and pitch replacing
RAP pours into plastics according to the plain asphalt mixture of identical mix condition mixing proportion identical as heat regeneration asphalt mixture
It in pallet, uniformly spreads out, is cooled to room temperature.
5. opening general supply, the quality of heat regeneration asphalt mixture and plain asphalt mixture, respectively 1.00kg are weighed
And 1.50kg, it is separately put into two rotation screen drums, being set as heating temperature is 70 DEG C, sieving time 5min, rotation
Sieve revolving speed is 30r/min, starts heating device, when material temperature degree to be mixed reaches set temperature, opens screening plant.
6. after the completion of to be sieved, record passes through the heat regeneration asphalt mixture of sieve pore and the quality of plain asphalt mixture
0.26kg and 0.34kg.
(3) result arranges
The extent of migration of heat regeneration asphalt mixture indicates that dimensionless is calculated according to following formula with λ:
In formula:
λ --- the extent of migration of the old mineral aggregate of heat regeneration asphalt mixture；
m2A--- pass through the quality of the heat regeneration asphalt mixture of sieve pore, kg；
m2B--- pass through the quality of the plain asphalt mixture of sieve pore, kg；
Pb--- the new Bituminous concrete surface total content of hot recycling mixture, %；
Pob--- the bitumen content in RAP, %；
N --- RAP mix ratio, dimensionless；
m1A--- the gross mass of heat regeneration asphalt mixture, kg；
m1B--- the gross mass of plain asphalt mixture, kg；
Extent of migration λ=60% of the old mineral aggregate of heat regeneration asphalt mixture is finally calculated.
Embodiment 3
Technical solution according to the invention, the present embodiment provide a kind of measurement heat regeneration asphalt mixture old mineral aggregate extent of migration
Test method, by taking AC-13C type heat regeneration asphalt mixture as an example, the parameter of RAP is 40%, determines RAP's by extraction test
Bitumen content is 3.2%, through heat regeneration asphalt mixture mix-design, determines that asphalt optimum content is 4.8%.
(1) test prepares
1. then setting baking oven according to newly gathering materials for the partial size > 4.75mm dried is weighed needed for mixing 3~5kg asphalt
In be heated to mixing and stirring 15 DEG C of temperature or more it is spare.
2. according to the new Bituminous concrete surface total content P of hot recycling mixturebThe pitch needed is calculated, pitch, regenerative agent sample are taken,
Defined asphalt, which is heated to, with baking oven mixes and stirs temperature.
3. the bitumen content for weighing partial size≤4.75mm RAP, RAP is 3.2%, RAP is placed in baking by mixture proportion 40%
110 DEG C are heated in case, heating time no more than 2h, avoids the further aging of RAP.
(2) it measures
10 DEG C of temperature or more are mixed and stirred 1. asphalt mixer is preheated in advance.
2. newly gathering materials for heating is placed in mixer, properly mixed with small scoop；Then be added need quantity RAP,
New pitch starts mixer and makes to mix and stir while stirring and mixes and stirs until uniformly in blade insertion mixture.
3. the heat regeneration asphalt mixture of uniform mixing is poured into plastic pallet, uniformly spread out, is cooled to room temperature；
4. adding using newly the gathering materials of phase homogenous quantities, pitch and RAP phase homogenous quantities and the new mineral aggregate of gradation and pitch replacing
RAP pours into plastics according to the plain asphalt mixture of identical mix condition mixing proportion identical as heat regeneration asphalt mixture
It in pallet, uniformly spreads out, is cooled to room temperature.
5. opening general supply, the quality of heat regeneration asphalt mixture and plain asphalt mixture, respectively 0.80kg are weighed
And 1.00kg, it is separately put into two rotation screen drums, being set as heating temperature is 70 DEG C, sieving time 5min, rotation
Sieve revolving speed is 30r/min, starts heating device, when material temperature degree to be mixed reaches set temperature, opens screening plant.
6. after the completion of to be sieved, record passes through the heat regeneration asphalt mixture of sieve pore and the quality of plain asphalt mixture
0.29kg and 0.33kg.
(3) result arranges
The extent of migration of heat regeneration asphalt mixture indicates that dimensionless is calculated according to following formula with λ:
In formula:
λ --- the extent of migration of the old mineral aggregate of heat regeneration asphalt mixture；
m2A--- pass through the quality of the heat regeneration asphalt mixture of sieve pore, kg；
m2B--- pass through the quality of the plain asphalt mixture of sieve pore, kg；
Pb--- the new Bituminous concrete surface total content of hot recycling mixture, %；
Pob--- the bitumen content in RAP, %；
N --- RAP mix ratio, dimensionless；
m1A--- the gross mass of heat regeneration asphalt mixture, kg；
m1B--- the gross mass of plain asphalt mixture, kg；
Extent of migration λ=58% of the old mineral aggregate of heat regeneration asphalt mixture is finally calculated.
The old mineral aggregate extent of migration test result of the heat regeneration asphalt mixture of different RAP volumes is shown in Table 1.
1 heat regeneration asphalt mixture extent of migration of table
| Mix type | RAP mix ratio n | The extent of migration λ of old mineral aggregate |
| AC-13C | 20% | 59% |
| AC-13C | 30% | 60% |
| AC-13C | 40% | 58% |
Test result shows that compared with plain asphalt mixture, (formate gradation composition, mixes and stirs temperature at duration of mixing in identical condition
Degree, asphalt content) under, it is obviously on the low side to wrap fine grained mineral aggregate for coarse granule surface bonding in heat regeneration asphalt mixture, in RAP
Fine grained mineral aggregate fails to completely disengage old mineral aggregate free migration, and extent of migration is about 60%；The size of RAP volume is to old mineral aggregate
The transition state of particle has no significant effect, this is identical as result of study before, sees hot in-plant reclaimed old mineral aggregate in the process
The migratory behaviour of grain, Guo Dedong, journal of Shandong university, the 2nd phase of volume 48, in April, 2018.
It should be noted that above embodiments are merely to understand the present invention, the present invention is not limited to this embodiment, all at this
Addition, equivalent replacement or the modification of the technical characteristic made on the basis of the technical solution of invention, are regarded as protection of the invention
Range.
Claims (5)
1. it is a kind of measure the old mineral aggregate extent of migration of heat regeneration asphalt mixture experimental rig, which is characterized in that by control system,
Heating is formed with attemperator and screening plant；The heating is used to heat screening plant and keep the temperature with attemperator, described
Control system be used to heat and the control of attemperator and screening plant and the acquisition and processing of data.
2. experimental rig according to claim 1, which is characterized in that the screening plant include rotary screen 101A and
101B, motor 109, frequency converter 111, drive rod 108, quality tester 103A and 103B, screenings discharge port 104A and
104B sieves mixture, isolates the mineral aggregate of different-grain diameter.
3. experimental rig according to claim 1, which is characterized in that the control system is by general supply 114, data
Reason is formed with control unit 115, heating control module 112 and screening control unit 113；The general supply is to entire test dress
It sets and is powered and controls；The data processing and control unit 115 can receive and show the information of acquisition, line number of going forward side by side
According to processing and control；The heating control module 112 is connect with heating with attemperator, controls the heating temperature of mixture；
The screening control unit 113 is connect with screening plant, controls the starting and closing, revolving speed of screening plant.
4. experimental rig according to claim 1, which is characterized in that the data processing is with control unit 115 by red
Outer temperature measurer 116, quality tester 103A and 103B composition, infrared radiation thermometer 116 are mixed for measuring heat regeneration asphalt in test
Close the temperature of material；Quality tester 103A and 103B are used to measure the mixture quality by sieve pore.
5. a kind of test using the Sample devices measurement old mineral aggregate extent of migration of heat regeneration asphalt mixture described in claim 1
Method, which comprises the following steps:
(1) test prepares
1. rotary screen 101A and 101B used is the square hole screen of 4.75mm；
2. weighing newly gathering materials for the partial size > 4.75mm dried according to needed for mixing 3~5kg asphalt, then setting baking
Be heated to mixing and stirring in case 15 DEG C of temperature or more it is spare；
3. according to the new Bituminous concrete surface total content P of hot recycling mixturebThe pitch needed is calculated, pitch, regenerative agent sample are taken, with baking
Case is heated to defined asphalt and mixes and stirs temperature；
4. the bitumen content for weighing partial size≤4.75mm RAP, RAP is Pob, mixture proportion n, RAP is placed in baking oven plus
For heat to 110 DEG C, heating time no more than 2h, avoids the further aging of RAP；
(2) it measures
Asphalt mixer is preheated to by S1 in advance mixes and stirs 10 DEG C of temperature or more；
Newly gathering materials for heating is placed in mixer by S2, is properly mixed with small scoop；Then the RAP for needing quantity, new drip is added
Blueness starts mixer and makes to mix and stir while stirring and mixes and stirs until uniformly in blade insertion mixture；
S3 pours into the heat regeneration asphalt mixture of uniform mixing in plastic pallet, uniformly spreads out, is cooled to room temperature；
S4 is added using newly the gathering materials of phase homogenous quantities, pitch and RAP phase homogenous quantities and the new mineral aggregate of gradation and pitch is replaced
RAP pours into plastics according to the plain asphalt mixture of identical mix condition mixing proportion identical as heat regeneration asphalt mixture
It in pallet, uniformly spreads out, is cooled to room temperature；
S5 opens general supply, weighs the quality of heat regeneration asphalt mixture and plain asphalt mixture, respectively m1AAnd m1B, will
It is separately put into two rotation screen drums, and being set as heating temperature is 70 DEG C, sieving time 5min, and rotary screen revolving speed is 30r/
Min starts heating device, when material temperature degree to be mixed reaches set temperature, opens screening plant；
After the completion of S6 is to be sieved, record passes through the heat regeneration asphalt mixture of sieve pore and the quality m of plain asphalt mixture2AWith
m2B；
(3) result arranges
The extent of migration of heat regeneration asphalt mixture indicates that dimensionless is calculated according to following formula with λ:
In formula:
λ --- the extent of migration of the old mineral aggregate of heat regeneration asphalt mixture, dimensionless；
m2A--- pass through the quality of the heat regeneration asphalt mixture of sieve pore, kg；
m2B--- pass through the quality of the plain asphalt mixture of sieve pore, kg；
Pb --- the new Bituminous concrete surface total content of hot recycling mixture, %；
Pob --- the bitumen content in RAP, %；
N --- RAP mix ratio, dimensionless；
m1A--- the gross mass of heat regeneration asphalt mixture, kg；
m1B--- the gross mass of plain asphalt mixture, kg.
Priority Applications (2)
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| CN107976389B (en) * | 2017-10-09 | 2020-07-24 | 淮阴工学院 | Method for measuring effective regeneration rate of old material in thermal regeneration asphalt mixture |
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