CN108951347A - The design method of heated tool butt-welding asphalt under a kind of high RAP volume - Google Patents
The design method of heated tool butt-welding asphalt under a kind of high RAP volume Download PDFInfo
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- CN108951347A CN108951347A CN201810790588.3A CN201810790588A CN108951347A CN 108951347 A CN108951347 A CN 108951347A CN 201810790588 A CN201810790588 A CN 201810790588A CN 108951347 A CN108951347 A CN 108951347A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/22—Binder incorporated in hot state, e.g. heated bitumen
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
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Abstract
The present invention relates to a kind of design method of heated tool butt-welding asphalt under high RAP volume, include the following steps: the performance indexes for testing RAP material, matrix pitch and regenerative agent；Determine the mineral aggregate gradation of regenerating mixture；Technique is mixed and stirred in selection；Carry out Marshall mix-design；Determine the asphalt optimum content of reclaimed asphalt mixture；Test difference mixes and stirs the miscible degree of new Bituminous concrete surface in each mixture under technique；The miscible degree of new Bituminous concrete surface in mixture is improved, and carries out mix-design；Mixture is prepared in the way of new Bituminous concrete surface complete miscibility, verifies high-temperature behavior.The present invention is to mix and stir technique by optimization to improve the miscible degree of new Bituminous concrete surface in regenerating mixture on the basis of existing regeneration specification, thus come the pavement performance for improving high RAP volume hot recycling mixture, to the utilization rate for improving RAP material and save limited resource and have great significance, the method for the present invention is simple, it is at low cost, be conducive to environmental protection.
Description
Technical field
The invention belongs to pavement construction material preparation technical field, it is related to heated tool butt-welding mixture under a kind of high RAP volume
Design method.
Background technique
Gradually perfect with national highway net, highway maintenance mileage has reached 467.46 ten thousand kilometers, in bituminous pavement
A large amount of waste and old ground surface material is generated during maintenance and reconstruction, includes a large amount of building stones and 3%~5% in RAP material
Bituminous concrete surface.These RAP materials are abandoned by any heap, can not only occupy limited land resource, but also can cause to environment seriously
Pollution.The regeneration of bituminous pavement be by add it is suitable newly gather materials, new pitch and regenerative agent, then process is mixed and stirred again
At the reclaimed asphalt mixture to conform to quality requirements, so as to effectively utilize RAP material, this is to the rare money of recycling
Source and environmental protection have important economic and social benefit.
In terms of the recycling of waste asphalt pavement, " asphalt highway regeneration techniques specification " (JTG of present
F41-2008) volume recommended is no more than 30%, and in China's Practical Project, due to worrying that the admixture of RAP material can shadow
The synthesis pavement performance of mixture is rung, the volume of RAP material is also no more than 30%, this is greatlyed restrict to waste asphalt material
The efficient utilization of material.Therefore, it is badly in need of proposing a kind of design method of the heated tool butt-welding mixture of high RAP volume.
The patent of invention that number of patent application is 201410406713.8 is dripped more particularly to a kind of hot recycling of high RAP ratio
The design method of green mixture.This method includes the variability for controlling RAP material, improves regenerative agent regeneration effect and determine and close
Suitable experimental condition.RAP aspect ratio can be effectively improved and recycling asphalt mixtures performance meets relevant regulations, RAP's mixes
Proportion can reach 36%.RAP material is utilized in the invention well, has saved resource, avoids the waste of material, effectively
Ground reduces the material cost of highway construction, while also can be reduced destruction of the resource exploitation to environment, but the volume of RAP material
It can't realize the efficient utilization to waste asphalt material.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides heated tool butt-welding asphalt under a kind of high RAP volume
Design method can effectively improve the utilization efficiency of RAP material, realize the recycling of waste asphalt pavement as far as possible.
The present invention provides the following technical solutions:
The design method of heated tool butt-welding asphalt, includes the following steps: under a kind of high RAP volume
Step 1: the performance indexes of test RAP material, matrix pitch and regenerative agent；
Step 2: the mineral aggregate gradation of regenerating mixture is determined；
Step 3: technique is mixed and stirred in selection；
Step 4: Marshall mix-design is carried out；
Step 5: the asphalt optimum content of reclaimed asphalt mixture is determined；
Step 6: test difference mixes and stirs the miscible degree of new Bituminous concrete surface in each mixture under technique；
Step 7: technique is mixed and stirred in optimization, to improve the miscible degree of new Bituminous concrete surface in mixture；
Step 8: preparing mixture in the way of new Bituminous concrete surface complete miscibility, verifies high-temperature behavior.
Any of the above-described scheme is preferably, and in the step 1, the volume of RAP material is 50%.High RAP volume refers to
Higher than the heated tool butt-welding asphalt that existing pitch regenerates 30% volume that specification is recommended, the present invention is with 50%RAP volume
Example.
Any of the above-described scheme is preferably, in step 2, in order to ensure the accuracy of test and convenient between different addition quantity
It is compared, respectively mixes and stirs heated tool butt-welding asphalt under mode and be all made of identical mineral aggregate gradation.
Any of the above-described scheme is preferably, mixed and stirred in the step 3 technique include at least mix and stir temperature, the mixing time,
The preheating temperature of RAP material.
Any of the above-described scheme is preferably, and in step 3, mixes and stirs three kinds of different sides of mixing and stirring of temperature selection by changing
Formula.Studies at home and abroad show that, mixed and stirred in factor in many at present, mixes and stirs temperature compared to mixing time and RAP material
Preheating temperature is affected to the miscible degree of Bituminous concrete surface new in mixture, therefore selects three kinds of temperature to compare here, illustrates
Explanation.
Any of the above-described scheme is preferably, and three kinds are mixed and stirred in mode, regenerating mixture mix and stir temperature be respectively 150 DEG C,
165℃、180℃。
Any of the above-described scheme is preferably, and three kinds are mixed and stirred in mode, mixing time of regenerating mixture and RAP material
Preheating temperature is all the same.Studies at home and abroad show that, the preheating temperature of mixing time and RAP material is miscible to new Bituminous concrete surface at present
Degree influence is smaller, therefore the different mode lower mixing times of mixing and stirring selects 3mins and 110 DEG C of RAP material preheater temperature.Three
Kind mix and stir three kinds of temperature representative it is different mix and stir technique, difference mixes and stirs the preheating times of mixing time and RAP material between technique
It is all the same.
Any of the above-described scheme is preferably, and three kinds of modes of mixing and stirring select identical asphalt content.In order to guarantee that three kinds are mixed and stirred
Unitary variant under mode in each regenerating mixture is the miscible degree of new Bituminous concrete surface, thus three kinds of modes of mixing and stirring select it is identical
Asphalt content.Three kinds are mixed and stirred mode and reflect three kinds of different miscible degree of new Bituminous concrete surface in regenerating mixture respectively.Optimal mixes
With the miscible degree highest of new Bituminous concrete surface that mode is under the premise of secondary aging does not occur in mixture.
Any of the above-described scheme is preferably, and three kinds of differences are mixed and stirred in mode, and the mixing time of regenerating mixture is
The preheating temperature of 3mins, RAP material is 110 DEG C.
Any of the above-described scheme is preferably, in step 4, according to existing " asphalt highway regeneration techniques specification "
(JTG F41-2008) carries out Marshall mix-design to regenerating mixture, determines the best of mixture under 50%RAP volume
Asphalt content.
Any of the above-described scheme is preferably, and in step 6, is symbolized using the test method of the miscible degree of new Bituminous concrete surface
Respectively mix and stir the miscible degree of new Bituminous concrete surface in regenerating mixture under mode.
Any of the above-described scheme is preferably, and in step 7, the premise of secondary aging will not occur in guarantee regenerating mixture
Under, selection can make the miscible degree of new Bituminous concrete surface reach best to mix and stir temperature.
Any of the above-described scheme is preferably, and mixing and stirring temperature is 180 DEG C.
Any of the above-described scheme is preferably, in step 8, since the raising of the miscible degree of new Bituminous concrete surface can make mixture
High-temperature behavior decreases, so preferably preparing mixture in the way of new Bituminous concrete surface complete miscibility, verifying its high-temperature behavior is
It is no to be able to satisfy code requirement.Asphalt Mixture verifying is carried out, especially increases and reduces high temperatures with miscible degree
Energy.
The utility model has the advantages that the present invention proposes a kind of design method of heated tool butt-welding asphalt under high RAP volume, be
Technique mixed and stirred by optimization on the basis of existing regeneration specification to improve the miscible degree of new Bituminous concrete surface in regenerating mixture, from
And to improve the pavement performance of high RAP volume hot recycling mixture.To the utilization rate for improving RAP material and save limited money
Source has great significance, therefore, the preparation method is that a kind of economical and practical process, and this method it is simple,
It is at low cost, be conducive to environmental protection.The present invention is on the basis of existing regeneration specification by introducing mixing for new Bituminous concrete surface in regenerating mixture
Molten degree carries out the design of high RAP volume, mixes and stirs technique as far as possible by optimize regenerating mixture under high RAP volume
The miscible degree for improving new Bituminous concrete surface in mixture, finally proposes the design method of heated tool butt-welding mixture under high RAP volume.
To the volume for improving RAP material in heated tool butt-welding asphalt so as to these valuable waste and old resources of rapid-digestion, substantially
The exploitation to high-quality mineral aggregate resource is reduced, protection soil and water resources have great meaning.
Detailed description of the invention
Fig. 1 is the formate gradation composition curve graph of mixture；
Fig. 2 is the relational graph of bulk specific gravity and asphalt content；
Fig. 3 is the relational graph of voidage and asphalt content；
Fig. 4 is the relational graph of void in mineral aggregate and asphalt content；
Fig. 5 is the relational graph of saturation degree and asphalt content；
Fig. 6 is the relational graph of stability and asphalt content；
Fig. 7 is the relational graph of flow valuve and asphalt content；
Fig. 8 is the formate gradation composition curve graph of mixture；
Fig. 9 is the actual measurement dynamic modulus master curve of 50%RAP volume regenerating mixture；
Figure 10 is the dynamic modulus master curve of each regenerating mixture prediction；
Figure 11 is the dynamic modulus master curve characterization of regenerating mixture prediction.
Specific embodiment
In order to further appreciate that technical characteristic of the invention, the present invention is carried out in detail combined with specific embodiments below
It illustrates.Embodiment only has illustrative effect to the present invention, without the effect of any restrictions, the technology of this field
The modification for any unsubstantiality that personnel make on the basis of the present invention, all should belong to protection scope of the present invention.
Below in conjunction with specific example, the present invention will be further described, but the contents of the present invention be not limited solely to it is following
Embodiment.
Embodiment 1
(1) the AC-16 type hot asphalt regenerating mixture of 40%RAP volume is selected, Bituminous concrete surface, new drip in RAP material
Green (AH-70 matrix pitch) performance is shown in Table 1.1 and table 1.2 respectively.
The performance test results of 1.1 Bituminous concrete surface of table
1.2 AH-70 pitch basic mechanical design feature test result of table
The technical indicator of AH-70 bi tumenf orr oad meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-
2004) technical stipulation in relation to No. 70 pitch in.
(2) mineral aggregate gradation of regenerating mixture is as shown in Figure 1.
It determines to regenerate according to practical engineering experience and " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004)
The formate gradation composition of mixture.
(3) by change mix and stir temperature select three kinds it is different mix and stir technique, reflect different new Bituminous concrete surfaces respectively
Miscible degree mixes and stirs technique as shown in table 1.3.
1.3 3 kinds of table different to mix and stir mode
(4) it is tested using a kind of method of miscible degree of new Bituminous concrete surface for testing reclaimed asphalt mixture, three kinds of sides
The miscible Tachistoscope result of the new Bituminous concrete surface of regenerating mixture is as shown in table 1.4 under formula.
The miscible Tachistoscope result of new Bituminous concrete surface of each mixture of table 1.4
(5) three kinds in order to avoid selection mix and stir temperature and generate different degrees of short ageing to pitch in mixture, need
The degree of aging of pitch at a temperature of mixing and stirring to three kinds in regenerating mixture is tested, and proof scheme is as follows: selecting first
Identical mineral aggregate gradation and asphalt content prepare mixture by 150 DEG C, 165 DEG C, 180 DEG C of temperature of mixing and stirring respectively, then distinguish
Extracting and reclaiming obtains the pitch in three kinds of mixtures, carries out three norms test, finally compares three kinds of temperature and mixes and stirs and drips under mode
The difference of green property.The pitch testing result extracted is as shown in following table 1.5.
The performance test results of pitch at a temperature of 1.5 difference of table is mixed and stirred
By table 1.5 it is found that three kinds to mix and stir the otherness that temperature influences pitch smaller, i.e., it is believed that by changing mixing
The temperature of mixing and stirring of material will not be to the degree of aging of wherein pitch generation significant difference.
According to practical engineering experience primary election bitumen content, using the asphalt content of primary election as intermediate value, by 0.5% variation ladder
Degree takes 5 kinds of asphalt contents (3.3%, 3.8%, 4.3%, 4.8%, 5.3%), and 4 Marshall examinations are made under every kind of asphalt content
Part and the mixture of reserved 1500g bulk are used to carry out the calculating of maximum theory density.According in known RAP material above
Bitumen content is 4.4%, and regenerative agent volume is that 5%, the RAP volume of Bituminous concrete surface is 40%, available new asphalt content point
Not Wei 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, then carry out Marshall Test respectively.Marshall performance test results
It is shown in Table 1.6.
Marshall test result under 1.6 40%RAP material aspect ratio of table
According to the Marshall Test in table 1.6 as a result, drawing the relational graph of each volume parameter and asphalt content respectively, such as
Shown in Fig. 2-Fig. 7, OAC1=(4.4%+4.3%+4.2%)/3=4.4%, OAC2=(4%+4.7%)/2 are calculated separately out
=4.4%, then obtain asphalt optimum content OAC=(OAC1+OAC2)/2=4.4% to get under the 40%RAP volume arrived
The asphalt optimum content of regenerating mixture is 4.4%.
(6) such as with every pavement performance situation of change of the increase reclaimed asphalt mixture of the miscible degree of new Bituminous concrete surface
Shown in following table
Every pavement performance of mixture under the miscible degree of the different new Bituminous concrete surfaces of table 1.7
It can be seen that the increase with the miscible degree of new Bituminous concrete surface in regenerating mixture, regenerating mixture according to table 1.7
High temperature rutting resistance be gradually reduced, the different degrees of raising of water stabilizing, cryogenic property and fatigue behaviour.Explanation
The miscible degree that technique promotes new Bituminous concrete surface in mixture is mixed and stirred by optimization appropriate, can effectively improve mixture
Water stabilizing, cryogenic property and fatigue behaviour are still able to satisfy specification although being declined for high-temperature behavior
It is required that.Therefore need to verify the high-temperature behavior of mixture after carrying out mix-design, examine it that can meet specification
Standard.
Embodiment 2
(1) the AC-16 type hot asphalt regenerating mixture of 50%RAP volume is selected, Bituminous concrete surface, new drip in RAP material
Green (AH-70 matrix pitch) performance is shown in Table 1.8 and table 1.9 respectively.
The performance test results of 1.8 Bituminous concrete surface of table
1.9 AH-70 pitch basic mechanical design feature test result of table
The technical indicator of AH-70 bi tumenf orr oad meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-
2004) technical stipulation in relation to No. 70 pitch in.
(2) mineral aggregate gradation of regenerating mixture is as shown in Figure 1.
It determines to regenerate according to practical engineering experience and " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004)
The formate gradation composition of mixture.
(3) by change mix and stir temperature select three kinds it is different mix and stir technique, reflect different new Bituminous concrete surfaces respectively
Miscible degree mixes and stirs technique as shown in table 1.10.
1.10 3 kinds of table different to mix and stir mode
(4) it is tested using a kind of method of miscible degree of new Bituminous concrete surface for testing reclaimed asphalt mixture, three kinds of sides
The miscible Tachistoscope result of the new Bituminous concrete surface of regenerating mixture is as shown in table 1.11 under formula.
The miscible Tachistoscope result of new Bituminous concrete surface of each mixture of table 1.11
(5) three kinds in order to avoid selection mix and stir temperature and generate different degrees of short ageing to pitch in mixture, need
The degree of aging of pitch at a temperature of mixing and stirring to three kinds in regenerating mixture is tested, and proof scheme is as follows: selecting first
Identical mineral aggregate gradation and asphalt content prepare mixture by 150 DEG C, 165 DEG C, 180 DEG C of temperature of mixing and stirring respectively, then distinguish
Extracting and reclaiming obtains the pitch in three kinds of mixtures, carries out three norms test, finally compares three kinds of temperature and mixes and stirs and drips under mode
The difference of green property.The pitch testing result extracted is as shown in following table 1.12.
The performance test results of pitch at a temperature of 1.12 difference of table is mixed and stirred
By table 1.12 it is found that three kinds to mix and stir the otherness that temperature influences pitch smaller, i.e., it is believed that by changing mixing
The temperature of mixing and stirring of material will not be to the degree of aging of wherein pitch generation significant difference.
According to practical engineering experience primary election bitumen content, using the asphalt content of primary election as intermediate value, by 0.5% variation ladder
Degree takes 5 kinds of asphalt contents (3.3%, 3.8%, 4.3%, 4.8%, 5.3%), and 4 Marshall examinations are made under every kind of asphalt content
Part and the mixture of reserved 1500g bulk are used to carry out the calculating of maximum theory density.According in known RAP material above
Bitumen content is 4.4%, and regenerative agent volume is that 5%, the RAP volume of Bituminous concrete surface is 50%, available new asphalt content point
Not Wei 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, then carry out Marshall Test respectively.Marshall performance test results
It is shown in Table 1.13.
Marshall test result under 1.13 50%RAP material aspect ratio of table
According to the Marshall Test in table 1.13 as a result, drawing the relational graph of each volume parameter and asphalt content respectively, such as
Shown in Fig. 2-Fig. 7, OAC1=(4.4%+4.3%+3.7%+4.3%)/4=4.2%, OAC2=(4%+ are calculated separately out
4.7%) then/2=4.4% obtains asphalt optimum content OAC=(OAC1+OAC2)/2=4.3% to get 50% arrived
The asphalt optimum content of regenerating mixture is 4.3% under RAP volume.
(6) such as with every pavement performance situation of change of the increase reclaimed asphalt mixture of the miscible degree of new Bituminous concrete surface
Shown in following table
Every pavement performance of mixture under the miscible degree of the different new Bituminous concrete surfaces of table 1.14
It can be seen that the increase with the miscible degree of new Bituminous concrete surface in regenerating mixture, regenerating mixture according to table 1.14
High temperature rutting resistance be gradually reduced, the different degrees of raising of water stabilizing, cryogenic property and fatigue behaviour.Explanation
The miscible degree that technique promotes new Bituminous concrete surface in mixture is mixed and stirred by optimization appropriate, can effectively improve mixture
Water stabilizing, cryogenic property and fatigue behaviour are still able to satisfy specification although being declined for high-temperature behavior
It is required that.Therefore need to verify the high-temperature behavior of mixture after carrying out mix-design, examine it that can meet specification
Standard.
The present invention in terms of the control of raw material firstly, test the items of RAP material, matrix pitch and regenerative agent
It can index；Determine the mineral aggregate gradation of regenerating mixture；Then, just selection mix and stir technique and carry out Marshall mix-design and
The determination of asphalt optimum content；Secondly, test difference mixes and stirs the miscible degree of new Bituminous concrete surface in each mixture under technique；Finally,
The technique of mixing and stirring that selection can significantly improve the miscible state of new Bituminous concrete surface again and will not occur secondary aging optimizes, and verifies
Its high-temperature behavior.The present invention is to mix and stir technique by optimization to improve in regenerating mixture on the basis of existing regeneration specification
The miscible degree of new Bituminous concrete surface, introduces this concept of the miscible degree of new Bituminous concrete surface in reclaimed asphalt mixture, improves as far as possible
The utilization rate of RAP material establishes the Research foundation of high RAP volume heat regeneration asphalt mixture design method.
Embodiment 3
Difference is tested by taking the reclaimed asphalt mixture of 50%RAP volume as an example mixes and stirs new and old drip in each mixture under technique
Green miscible degree.
(1) regenerating mixture of AC-16 type 50%RAP volume, Bituminous concrete surface, matrix pitch (AH-70 road petroleum are prepared
Pitch), A type regenerative agent, gather materials, the performance indicator of miberal powder is shown in Table 1.15~table 1.20 respectively.
The performance test results of 1.15 Bituminous concrete surface of table
1.16 AH-70 pitch basic mechanical design feature test result of table
1.17 regenerative agent performance indicator of table
1.18 fine aggregate performance test results of table
1.19 coarse aggregate performance test results of table
1.20 miberal powder performance test results of table
The technical indicator of AH-70 bi tumenf orr oad meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-
2004) technical stipulation in relation to No. 70 pitch in.Coarse aggregate, fine aggregate, miberal powder performance indicator be all satisfied " highway engineering collection
Expect testing regulations " relevant regulations in (JTG E42-2005).
(2) according to existing regeneration specification, the reclaimed asphalt mixture is determined according to Marshall mixing proportion design method
Asphalt optimum content.Formate gradation composition is as shown in Figure 8.
According to practical engineering experience primary election bitumen content, using the asphalt content of primary election as intermediate value, the asphalt content of primary election is
4.3%, take 5 kinds of asphalt contents by 0.5% variable gradient, asphalt content is respectively 3.3%, 3.8%, 4.3%, 4.8%,
5.3%, it then makes marshal piece (cylinder specimen that marshal piece is high 100mm, diameter 100mm) and carries out items
The test of volume index, the asphalt optimum content for finally measuring reclaimed asphalt mixture under 50%RAP volume is 4.4%.
(3) firstly, the dynamic modulus of actual measurement regenerating mixture, then draws out dynamic modulus master according to each dynamic modulus
Curve.The present invention uses uniaxial compression test according to specification, using 20 DEG C, 35 DEG C and 50 DEG C three kinds of test temperatures and 0.1Hz,
Six loading frequencies of 0.5Hz, 1Hz, 5Hz, 10Hz, 25Hz, and drawn according to test result and regenerated under 50%RAP volume respectively
The dynamic modulus master curve of mixture, reference temperature are 35 DEG C, and it is as shown in Figure 9 to draw log-log coordinate.
(4) asphalt mastic that Bituminous concrete surface content is respectively 100%, 90%, 80%, 70% is prepared.The system of asphalt mastic
Standby process is as follows: the 1. preparation of the miscible degree asphalt mastic of new Bituminous concrete surface 100%: first, in accordance with pitch total in regenerating mixture
Dosage 4.4%, wherein the ratio of Bituminous concrete surface and new pitch (regenerative agent) is 1.3%:3.1%, finally according in regenerating mixture
1:1.3 Ratio of filler bitumen add miberal powder, be sufficiently mixed uniformly after obtain new Bituminous concrete surface 100% it is miscible when asphalt mastic；2. new
The preparation of the miscible degree asphalt mastic of Bituminous concrete surface 90%: according to the ratio of Bituminous concrete surface and new pitch (regenerative agent), 90% is selected to mix
The Bituminous concrete surface of amount is mixed with same new pitch and regenerative agent, i.e., the ratio of Bituminous concrete surface and new pitch (regenerative agent) is 1.17%:
3.1%, miberal powder is added also according to the Ratio of filler bitumen of 1:1.3, finally obtains the asphalt adhesive under the miscible degree of new Bituminous concrete surface 90%
Slurry；3. the preparation of the miscible degree asphalt mastic of new Bituminous concrete surface 80%: similarly, the ratio of Bituminous concrete surface and new pitch (regenerative agent) is
1.04%:3.1%, Ratio of filler bitumen 1:1.3 obtain the asphalt mastic under the miscible degree of new Bituminous concrete surface 80%；4. new Bituminous concrete surface
The preparation of 70% miscible degree asphalt mastic: the ratio of Bituminous concrete surface and new pitch (regenerative agent) is 0.91%:3.1%, Ratio of filler bitumen
For 1:1.3, the asphalt mastic under the miscible degree of new Bituminous concrete surface 70% is obtained.
(5) DSR (HR-1 type) test is carried out to four kinds of asphalt mastics respectively, test uses dynamic frequency scanning, test temperature
Degree is 20 DEG C, 35 DEG C and 50 DEG C, and scan frequency is 0.1Hz~25Hz.Each asphalt mastic measured is met into modulus and phase
Improved Hirsch model is brought at angle into, and it is pre- to obtain the mixture dynamic modulus containing each asphalt mastic as shown in 1-1 for formula
Principal curve is surveyed, as shown in Figure 10.
In formula:
In formula: E1、E2、EaThe elasticity modulus of spring 1,2, the modulus gathered materials respectively in Burgers model；η1、η2Respectively
For the viscosity for sticking pot 1,2；ω is angular frequency；δ is phase angle；υ is Poisson's ratio；VMA is void in mineral aggregate；VFA is full for pitch
And degree；WithThe respectively dynamic modulus and dynamic shear modulus of asphalt mastic.
(6) it using the dynamic modulus master curve of prediction as reference line, is compared with the dynamic modulus master curve of actual measurement,
The quantitative miscible degree for symbolizing new Bituminous concrete surface in each regenerating mixture.Characteristic manner is as shown in Figure 11.
The dynamic modulus master curve that the principal curve that diamond block represents in Figure 11 obtains as actual measurement, remaining four (circular block,
Gore, rectangular block represent) the obtained dynamic modulus of prediction be grey principal curve, due to survey obtained principal curve and
The line position for predicting obtained principal curve is not parallel relation, takes two-end-point to do interpolation and then be averaged so this research uses
The method of value characterizes miscible degree.According to interpolation relationship, i.e., the principal curve of four grey successively represents 70% from top to bottom,
80%, 90%, 100%, and the location of terminal A is 71%, terminal B present position is 78%, so obtaining terminal A and being
71%, terminal B 78% is averaged to obtain the regenerating mixture of 50%RAP volume and mixes and stirs under mode in it at 165 DEG C
The miscible degree of the new Bituminous concrete surface in portion is 74.5%.
Similarly, by taking the regenerating mixture of 30% and 40%RAP volume as an example, method as described above is at 165 DEG C
The miscible degree for mixing and stirring new Bituminous concrete surface inside mixture under mode is respectively 92.5%, 86.0%.
For the present invention firstly, in terms of the control of raw material, the present invention carries out Variability Analysis and processing to RAP material, into
One step reduces the variability of mineral aggregate formate gradation composition；Then, the content for controlling Bituminous concrete surface is unitary variant, it is ensured that mixture
The variation of modulus is only influenced by bitumen content variation, and eliminates mix and stir factor, human error and mineral aggregate gradation as far as possible
Influence, improve results precision；It is estimated secondly, selection the model of half carries out mixture dynamic modulus, than it
Preceding full experience or full theoretical model are more accurate；Finally, the mixing taking the dynamic modulus master curve of actual measurement and estimating
Material principal curve compares, and more can accurately symbolize new Bituminous concrete surface in mixture using being compared between principal curve
Miscible degree.The present invention eliminates the influence of factor of mixing and stirring, human error and mineral aggregate gradation as far as possible, improves experimental test essence
Degree.
It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
It is so possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features
It is equivalently replaced；And these are modified or replaceed, various embodiments of the present invention skill that it does not separate the essence of the corresponding technical solution
The range of art scheme.
Claims (10)
1. the design method of heated tool butt-welding asphalt under a kind of high RAP volume, characterized by the following steps:
Step 1: the performance indexes of test RAP material, matrix pitch and regenerative agent；
Step 2: the mineral aggregate gradation of regenerating mixture is determined；
Step 3: technique is mixed and stirred in selection；
Step 4: Marshall mix-design is carried out；
Step 5: the asphalt optimum content of reclaimed asphalt mixture is determined；
Step 6: test difference mixes and stirs the miscible degree of new Bituminous concrete surface in each mixture under technique；
Step 7: technique is mixed and stirred in optimization, to improve the miscible degree of new Bituminous concrete surface in mixture；
Step 8: preparing mixture in the way of new Bituminous concrete surface complete miscibility, verifies high-temperature behavior.
2. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: in step 1, the volume of RAP material is 50%.
3. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: mixed and stirred in the step 3 technique include at least mix and stir temperature, the mixing time, RAP material preheating temperature.
4. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: in step 3, mixes and stirs technique and mix and stir temperature by changing and select three kinds different to mix and stir mode.
5. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as claimed in claim 4
In: three kinds are mixed and stirred in mode, and mixing and stirring temperature is respectively 150 DEG C, 165 DEG C, 180 DEG C.
6. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as claimed in claim 4
In: three kinds are mixed and stirred in mode, and the preheating temperature of mixing time and RAP material is all the same.
7. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as claimed in claim 4
In: three kinds of differences are mixed and stirred in mode, and the mixing time is 3mins, and the preheating temperature of RAP material is 110 DEG C.
8. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: in step 4, Marshall mix-design is carried out to regenerating mixture according to existing regeneration specification, determines that 50% RAP mixes
Measure the asphalt optimum content of lower mixture.
9. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: in step 6, symbolized using the test method of the miscible degree of new Bituminous concrete surface respectively mix and stir under mode it is new in regenerating mixture
The miscible degree of Bituminous concrete surface.
10. the design method of heated tool butt-welding asphalt, feature exist under a kind of high RAP volume as described in claim 1
In: in step 7, under the premise of guaranteeing that secondary aging will not occur for regenerating mixture, selection can make the miscible degree of new Bituminous concrete surface
Reach best and mixes and stirs temperature.
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| CN110331637A (en) * | 2019-07-09 | 2019-10-15 | 深圳市市政工程总公司 | The fine sorting reuse method of road milling asphalt waste |
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| CN113702427A (en) * | 2021-06-03 | 2021-11-26 | 东南大学 | Method for evaluating miscibility characteristics of new and old asphalt and regenerant in-situ thermal regeneration |
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| CN109914208A (en) * | 2019-04-15 | 2019-06-21 | 英达热再生有限公司 | Linear road changes section optimization asphalt and matches hot reproduction repairing method |
| CN110261587A (en) * | 2019-05-15 | 2019-09-20 | 深圳高速工程顾问有限公司 | In-situ heat regeneration remixing match ratio determines method |
| CN110261587B (en) * | 2019-05-15 | 2021-11-09 | 深圳高速工程顾问有限公司 | Method for determining mix proportion of hot in-place recycling |
| CN110331637A (en) * | 2019-07-09 | 2019-10-15 | 深圳市市政工程总公司 | The fine sorting reuse method of road milling asphalt waste |
| CN111960727A (en) * | 2020-04-28 | 2020-11-20 | 山东省交通科学研究院 | Design method of high-mixing-amount anti-fatigue regenerated asphalt mixture |
| CN111739593A (en) * | 2020-06-24 | 2020-10-02 | 宁夏睿泰天成新材料科技有限公司 | Design method for mix proportion of warm-mix high-volume recycled asphalt mixture |
| CN111739592A (en) * | 2020-07-21 | 2020-10-02 | 山东交通学院 | Method for quantifying new-old asphalt interface fusion degree based on asphalt mixture performance |
| CN111739592B (en) * | 2020-07-21 | 2023-08-04 | 山东交通学院 | Method for quantifying new-old asphalt interface fusion degree based on asphalt mixture performance |
| CN111962359A (en) * | 2020-08-31 | 2020-11-20 | 四川省公路规划勘察设计研究院有限公司 | Method for determining mixing technological parameters of hot recycled asphalt mixture |
| CN111962359B (en) * | 2020-08-31 | 2021-05-28 | 四川省公路规划勘察设计研究院有限公司 | Method for determining mixing technological parameters of hot recycled asphalt mixture |
| CN113024161A (en) * | 2021-03-16 | 2021-06-25 | 南昌工程学院 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
| CN113024161B (en) * | 2021-03-16 | 2022-07-01 | 南昌工程学院 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
| CN113702427A (en) * | 2021-06-03 | 2021-11-26 | 东南大学 | Method for evaluating miscibility characteristics of new and old asphalt and regenerant in-situ thermal regeneration |
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Application publication date: 20181207 |