CN108589473A - A kind of mixing method of hot in-plant reclaimed asphalt mixture - Google Patents
A kind of mixing method of hot in-plant reclaimed asphalt mixture Download PDFInfo
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- CN108589473A CN108589473A CN201810421701.0A CN201810421701A CN108589473A CN 108589473 A CN108589473 A CN 108589473A CN 201810421701 A CN201810421701 A CN 201810421701A CN 108589473 A CN108589473 A CN 108589473A
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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
- E01C19/1054—Preparing mixtures of which at least part of the solid ingredients has previously been deposited on the surface, excluding penetrating or surface dressing, e.g. in situ mixing, mixing involving lifting of spread or windrowed aggregate
Abstract
The present invention provides a kind of mixing methods of hot in-plant reclaimed asphalt mixture, belong to technical field of road engineering, and the mass ratio when present invention is according to the old specific surface areas gathered materials and newly gathered materials of RAP and its mixing calculates the ratio that new pitch is added by several times.It new will gather materials and carry out first with first part new pitch after preheating and mix and stir, and obtain the first mixture；By the RAP after preheating it is old gather materials, remaining new pitch is mixed and stirred with first mixture progress second, obtain the second mixture；Miberal powder is carried out third with second mixture to mix and stir, obtains hot in-plant reclaimed asphalt mixture.The method of the present invention has the characteristics that be easily achieved, mix and stir it is simple for process efficiently, mixture is easy to be compacted and performance is obviously improved.
Description
Technical field
The present invention relates to technical field of road engineering, more particularly to a kind of side of mixing and stirring of hot in-plant reclaimed asphalt mixture
Method.
Background technology
In China, Applied of Asphalt Pavement Recycle Technique mainly has cold in-plant recycling technology, Local Cold Regenerating Technology, hot in-plant reclaimed
Technology, hot in-place recycling technology.Wherein, plant-mix heat recycle technology refers to transporting old asphalt pavement back batching plant after digging,
Convergency fracturing again carries out proportion design, determines the addition ratio of old asphalt mixture according to the quality requirement of road surface different levels
Example, regenerative agent, new pitch material, it is new gather materials etc. mix and stir into heated tool butt-welding mixture making again by a certain percentage in mixer
The technology on road surface.According to《Asphalt highway regeneration techniques specification (JTG F41-2008)》, existing hot in-plant reclaimed mixture
It mixes and stirs technique mainly to follow conventional lines the technique of mixing and stirring of hot-mix asphalt mixture, i.e., first gathers materials RAP is old and independent heating of newly gathering materials,
Then by RAP it is old gather materials mixed in mixing cylinder with newly gathering materials, then add new pitch and mix and stir.But this routine mixes and stirs technique,
Do not account for it is new gather materials and the old differences gathered materials and (have pitch to wrap) of RAP, cause new in the hot recycling mixture after mixing and stirring
Gather materials from RAP it is old gather materials wrapped that situation is different by new pitch, the pitch of mixture wraps lack of homogeneity, usually occurs large-sized
The phenomenon that newly gathering materials and still do not wrap pitch fully after mixing and stirring, and showing grey material.
Invention content
The present invention provides a kind of mixing methods of hot in-plant reclaimed asphalt mixture, include the following steps：
1) the old total specific surface areas gathered materials and newly gathered materials of RAP are calculated separately, SA is denoted asRAPAnd SANewly；
The SARAPFor the adduction of the old specific surface areas gathered materials of each shelves RAP sieve pore percent of pass product corresponding to its；The SANewly
For the adduction for specific surface area sieve pore percent of pass product corresponding to its that each shelves newly gather materials；According to《Asphalt highway construction technology
Specification (JTG F40-2004)》Middle formula (B.6.9-2) calculates the specific surface area SA that each shelves gather materials；
2) it new will gather materials and carry out first with first part new pitch after preheating and mix and stir, and obtain the first mixture；
By the RAP after preheating it is old gather materials, remaining new pitch carries out second with first mixture and mixes and stirs, obtain second and mix
Close material；
3) the second mixture that miberal powder is obtained with the step 2) is carried out third to mix and stir, it is mixed obtains hot in-plant reclaimed asphalt
Close material；
The mass ratio of a part of new pitch described in the step 2) and total new pitch is SA 'Newly/(SA’Newly+SA’RAP)
SA’RAPAnd SA 'NewlyFormula I and II is respectively adopted to be calculated：
SA’RAP=PRAP1·SARAP1+PRAP2·SARAP2+……+PRAPm·SARAPmFormula I
SA’Newly=P1·SA1+P2·SA2+……+Pn·SAnFormula II
P described in formulaRAP1、PRAP2、……PRAPmGather materials in hot in-plant reclaimed asphalt mixture for the old each shelves that gather materials of RAP
Match ratio；
The SARAP1、SARAP2、……SARAPmFor the old specific surface area gathered materials of each shelves of RAP, unit m2/kg；
The P1、P2、……PnGather materials the match ratio in hot in-plant reclaimed asphalt mixture for each shelves that newly gather materials；
The SA1、SA2、……SAnFor the specific surface area that each shelves that newly gather materials gather materials, unit m2/kg。
Preferably, old thick, the fine aggregates to gather materials of RAP in the step 1) meets《Asphalt highway construction technology is advised
Model (JTG F40-2004)》With《Asphalt highway regeneration techniques specification (JTG F41-2008)》Requirement.
Preferably, thick, the fine aggregate that newly gather materials in the step 1) meet《Standard specification for construction and acceptance of highway asphalt pavement》
The requirement of JTGF40-2004.
Preferably, the new pitch is 70# matrix pitches, SBS modified pitch.
Preferably, the miberal powder is the levigate obtained miberal powder of limestone.
Preferably, the preheating temperature newly gathered materials in the step 2) be 165~185 DEG C, the preheating time be 1.5~
2h。
Preferably, the first temperature mixed and stirred is 155~175 DEG C in the step 2), and the described first time mixed and stirred was 90
~110s.
Preferably, the old preheating temperatures gathered materials of RAP are 100~120 DEG C in the step 2), and the preheating time is 1.5
~2.5h.
Preferably, in the step 2) the second temperature mixed and stirred be 155~175 DEG C, the second time mixed and stirred be 60~
90s。
Preferably, the temperature that third is mixed and stirred in the step 3) is 155~175 DEG C, and the time that the third is mixed and stirred is 90
~110s.
Advantageous effects：It is old according to RAP the present invention provides a kind of mixing method of hot in-plant reclaimed asphalt mixture
Gather materials and calculates the ratio that new pitch is added at twice with the mass ratio when specific surface area newly gathered materials and its mixing, it is pre- by newly gathering materials
First is carried out with first part new pitch to mix and stir, obtain the first mixture after heat；By the RAP after preheating it is old gather materials, remaining new drip
It is green to be mixed and stirred with first mixture progress second, obtain the second mixture；Miberal powder and the step 2) are obtained second mixed
It closes material progress third to mix and stir, obtains hot in-plant reclaimed asphalt mixture.New pitch is added and is helped by bond material characteristic at twice
In uniformly wrapping for surface of aggregate pitch.The method of the present invention have be easily achieved, mix and stir it is simple for process efficiently, mixture is easy to
The characteristics of compacting, and can effectively avoid the grey material phenomenon occurred during reclaimed asphalt mixture mixing.
Description of the drawings：
Fig. 1 is the flow chart of hot in-plant reclaimed asphalt mixture mixing method of the embodiment of the present invention.
Specific implementation mode
The present invention provides a kind of mixing methods of hot in-plant reclaimed asphalt mixture, include the following steps：
1) the old specific surface areas gathered materials and newly gathered materials of RAP are calculated separately, SA is denoted asRAPAnd SANewly；
The SARAPFor the adduction of the old specific surface areas gathered materials of each shelves RAP sieve pore percent of pass product corresponding to its；The SANewly
For the adduction for specific surface area sieve pore percent of pass product corresponding to its that each shelves newly gather materials；According to《Asphalt highway construction technology
Specification (JTG F40-2004)》Middle formula (B.6.9-2) calculates the specific surface area SA that each shelves gather materials；
2) it new will gather materials and carry out first with first part new pitch after preheating and mix and stir, and obtain the first mixture；
By the RAP after preheating it is old gather materials, remaining new pitch carries out second with first mixture and mixes and stirs, obtain second and mix
Close material；
3) the second mixture that miberal powder is obtained with the step 2) is carried out third to mix and stir, it is mixed obtains hot in-plant reclaimed asphalt
Close material.
In the present invention, old thick, the fine aggregates to gather materials of the RAP preferably satisfies《Standard specification for construction and acceptance of highway asphalt pavement
(JTG F40-2004)》With《Asphalt highway regeneration techniques specification (JTG F41-2008)》Requirement.
The present invention, which new will gather materials, to be carried out first with first part new pitch after preheating and mixes and stirs, and the first mixture is obtained；
It is mixed and stirred carrying out second with remaining new pitch, first mixture after the old preheatings of gathering materials of RAP, obtains the second mixing
Material.
In the present invention, the temperature after the new preheating of gathering materials is preferably 165~185 DEG C, more preferably 175~180 DEG C；
The time of the new preheating of gathering materials is preferably 1.5~2h, more preferably 1.8h.
In the present invention, the new pitch is preferably 70# matrix pitches, SBS modified pitch.
In the present invention, newly gather materials with the preheating after the preferred preheating of the new pitch and mix, after the new pitch preheating
Temperature be preferably 150~160 DEG C, more preferably 155 DEG C.
In the present invention, the described first temperature mixed and stirred is preferably 155~175 DEG C, more preferably 160~170 DEG C, described
First time mixed and stirred was preferably 90~110s.
The method that the present invention couple first mixes and stirs is not particularly limited, and selects mixing method well known to those skilled in the art i.e.
It can.
After obtaining the first mixture, the present invention by RAP it is old gather materials preheating after with remaining new pitch, first mixture into
Row second mixes and stirs, and obtains the second mixture.In the present invention, the temperature after the old preheatings of gathering materials of the RAP is preferably 100~120
DEG C, more preferably 105~115 DEG C；The time of the old preheatings of gathering materials of the RAP is preferably 1.5~2.5h, more preferably 2h.
In the present invention, the described second temperature mixed and stirred is preferably 155~175 DEG C, more preferably 160~170 DEG C, described
Second time mixed and stirred was preferably 60~90s.
The method that the present invention couple second mixes and stirs is not particularly limited, and selects mixing method well known to those skilled in the art i.e.
It can.
In the present invention, the old mass ratioes for gathering materials and newly gathering materials of the RAP are preferably 10~40%, more preferably 20~
30%.
The present invention is according to newly gathering materials the new pitch in hot in-plant reclaimed asphalt mixture with the old specific surface areas gathered materials of RAP
Add at twice, first allow during mix and stir part new pitch with it is new gather materials first mixed and stirred, add later RAP it is old gather materials with
Remaining new pitch, obtains hot in-plant reclaimed asphalt mixture.Compared to the conventional way for mixing and stirring technique, this method has fully considered newly
Gather materials and the old differences gathered materials to new pitch adsorption capacity of RAP so that new surface of aggregate, which can be wrapped up in more, is attached to new pitch, makes
The distribution for obtaining new pitch in regenerating mixture is more uniform.
After obtaining the second mixture, miberal powder is carried out third with second mixture and mixed and stirred by the present invention, obtains plantmix's heat
Reclaimed asphalt mixture；
In the present invention, the mass ratio of a part of new pitch and total new pitch is SA 'Newly/(SA’Newly+SA’RAP)
The SA 'RAPAnd SA 'NewlyFormula I and II is respectively adopted to be calculated：
SA’RAP=PRAP1·SARAP1+PRAP2·SARAP2+……+PRAPm·SARAPmFormula I
SA’Newly=P1·SA1+P2·SA2+……+Pn·SAnFormula II
P described in formulaRAP1、PRAP2、……PRAPmGather materials in hot in-plant reclaimed asphalt mixture for the old each shelves that gather materials of RAP
Match ratio；
The SARAP1、SARAP2、……SARAPmFor the old specific surface area gathered materials of each shelves of RAP, unit m2/kg；
The P1、P2、……PnGather materials the match ratio in hot in-plant reclaimed asphalt mixture for each shelves that newly gather materials；
The SA1、SA2、……SAnFor the specific surface area that each shelves that newly gather materials gather materials, unit m2/kg。
In the present invention, the temperature that the third is mixed and stirred is preferably 155~175 DEG C, more preferably 160~170 DEG C, described
The time that third is mixed and stirred is preferably 90~110s.
In the present invention, the miberal powder and the old mass ratioes to gather materials of the RAP are preferably 10%~40%, more preferably
20%~30%.
In the present invention, further preferably include that will mix and stir material to take the dish out of the pot successively, be molded and obtain plantmix's heat again after the third is mixed and stirred
Raw asphalt.
In the present invention, it is described go out pot temperature be preferably 155~165 DEG C, more preferably 158~162 DEG C；The molding temperature
Preferably 150~160 DEG C, more preferably 153~158 DEG C of degree.
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Newly gather materials in following embodiment, pitch, RAP it is old gather materials, the mass percent of miberal powder according to《Asphalt highway is applied
Work technical specification (JTGF40-2004)》With《Asphalt highway regeneration techniques specification (JTGF41-2008)》By mix-design
It determines.
Miberal powder used below is limestone mineral powder.
Grading used below is AC-25C.
Embodiment 1
Gather materials (0~5mm, 5~10mm, the gears of 10~25mm tri-) old to RAP first is sampled, and is then taken out to sample
Propose experiment, experiment measure the old bitumen contents gathered materials of each shelves RAP and RAP is old gather materials in Bituminous concrete surface three norms, test result
As shown in table 1.The old front and back screening results of extracting that gather materials of RAP are as shown in table 2.
Old bitumen content and the three norms of gathering materials of RAP in 1 embodiment 1 of table
What the old extractings of gathering materials of RAP were front and back in 2 embodiment 1 of table is sieved through rate result
The new predominantly limestone that gathers materials, newly gathers materials as shown in table 3 with the screening result of miberal powder, and gathers materials and RAP for new
The test of old progress relative density of gathering materials, test result are as shown in table 4.
Newly gather materials thick, fine aggregate and miberal powder screening result in 3 embodiment 1 of table
Table 4 newly gathers materials and the old density test results of gathering materials of RAP
New pitch selects 70# matrix pitches, and property indices are satisfied by requirement after measured.
To newly gather materials, RAP it is old gather materials, miberal powder carry out AC-25C gradation designs, formate gradation composition meet《Asphalt highway is applied
Work technical specification (JTG F40-2004)》Grading limit requirement.
To newly gather materials, RAP it is old gather materials, new pitch and miberal powder are mixed and stirred according to pitch gradation adding method.Pitch is by several times
It is as follows that addition determines that method calculates：
Newly gathered materials and the screening result after the old extractings of gathering materials of each shelves RAP according to each shelves above first, passes through modular formula meter
Each shelves are calculated newly to gather materials and the old specific surface areas gathered materials of each shelves RAP：
SANew 0~3=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41+0.0041 × 100+0.0082 × 79.2+0.0164 × 47.9+0.0287 ×
33.4+0.0614 × 21.7+0.1229 × 13.7+0.3277 × 9.8=9.44；
SANew 3~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.80；
SANew 5~10=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.46；
SANew 10~15=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41；
SANew 15~25=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41+0.0041 × 93.8+0.0082 × 65.1+0.0164 × 52.1+0.0287 ×
38.2+0.0614 × 15.2+0.1229 × 4.1+0.3277 × 0.6=4.91；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=2.65；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=1.87.
Result of calculation summarizes as shown in table 5.
Newly gather materials in 5 embodiment 1 of table and the old specific surface areas of gathering materials of RAP
According to original RAP it is old gather materials volume be 25% when AC-25C hot recycling mixtures mix-design as a result, root
Can be calculated separately out in hot recycling mixture according to formula I and II newly gather materials, RAP is old gathers materials and overall specific surface area：
The old total specific surface areas gathered materials of 25%RAP：4.91 × 6%+2.65 × 6%+1.87 × 13%=0.70；
The 75% total specific surface newly gathered materials：9.44 × 32.5%+0.80 × 2.4%+0.46 × 4.8%+0.41 × 3.4%
+ 0.41 × 29%=3.24；
Therefore, it is 3.24/ (0.70+3.24)=82% that specific surface area of newly gathering materials, which accounts for overall ratio,.Final calculation result
It is shown in Table 6.
The old volume AC-25C hot recycling mixture specific surface area result of calculations of gathering materials of 25%RAP in 6 embodiment 1 of table
The adding proportion twice of new pitch is determined according to the specific surface area of hot recycling mixture.For RAP it is old gather materials mix
The hot recycling mixture of amount 25%, it is 82% that its new specific surface area of gathering materials, which accounts for overall ratio, as shown in Table 6, in order to make newly to collect
Material, the old surface of aggregate of RAP wrap the uniform of asphalt membrane thickness, and 82% in first step addition new pitch is mixed and stirred with newly gathering materials.
Wherein, each shelves adding proportion of newly gathering materials is：15~25：10~15：5~10：3~5：0~3：Miberal powder=29：3.4：
4.8：2.4：32.5：3.1, each old adding proportions gathered materials of shelves RAP are 10~25：5~10：0~5=13：6：6, No. 70 matrix
Pitch bitumen aggregate ratio is 2.49%.
Specifically include following steps：
(1) it will newly gather materials after being heated to 175 DEG C, be added to and mix and stir in pot, mix and stir kettle temperature and be maintained at 165~175 DEG C；
(2) new pitch is heated to 155 DEG C or so, it is that 82% new pitch is added in (1) and carries out the to take mass fraction
One mixes and stirs 90s；
(3) the old new pitch gathered materials and be left 18% of the RAP for preheating 2h under the conditions of 110 DEG C is added in (2) and is carried out
Second mixes and stirs 90s；
(4) it after miberal powder being heated to 175 DEG C, is added to progress third in (3) and mixes and stirs 90s；
(5) mixture after being mixed and stirred obtained by step (4) is taken the dish out of the pot at 155~165 DEG C, is obtained in 150~160 DEG C of moldings
Hot in-plant reclaimed mixture.
Comparative example 1
Routine is mixed and stirred technique and is as follows, other same as Example 1.
(1) it will newly gather materials after being heated to 175 DEG C, be added to and mix and stir in pot, mix and stir kettle temperature and be maintained at 165~175 DEG C；
(2) 90s will be mixed and stirred in the old additions (1) of gathering materials of RAP for preheating 2h under the conditions of 110 DEG C；
(3) new pitch is heated to 155 DEG C or so, is added in (2) and mixes and stirs 90s；
(4) it after miberal powder being heated to 175 DEG C, is added in (3) and mixes and stirs 90s；
(5) mixture after being mixed and stirred obtained by step (4) is taken the dish out of the pot at 155~165 DEG C, is obtained in 150~160 DEG C of moldings
Hot in-plant reclaimed mixture.
The factory that the routine in technique and comparative example 1 mixes and stirs technique acquisition is mixed and stirred for the gradation addition in above-described embodiment 1
The test that heat regeneration asphalt mixture carries out indoor marshal piece parameter is mixed, test result is as shown in table 7.As it can be seen that embodiment 1
In hot in-plant reclaimed asphalt mixture marshal piece density it is more preferable.
Heat regeneration asphalt mixture marshal piece parametric results in 7 embodiment 1 of table and comparative example 1
| Technique | Voidage average value (%) | Remarks |
| Comparative example 1 | 4.07 | Four parallel test specimens are made to be averaged |
| Embodiment 1 | 3.99 | Four parallel test specimens are made to be averaged |
Using it is above-mentioned respectively according in embodiment 1 pitch by several times add mix and stir routinely mixed and stirred in skill and comparative example 1 technique obtain
Hot in-plant reclaimed asphalt mixture carry out dynamic stability test, indirect tensile test on frozen-thaw and low temperature the small beam experiment, test result is such as
Shown in table 8.As it can be seen that in embodiment 1 by several times addition mix and stir the hot in-plant reclaimed asphalt mixture mixed and stirred under technique performance it is more preferable.
In table, VV is the voidage for being compacted asphalt, and DS is the dynamic stability of asphalt mixture in track test, and TSR is that freeze thawing is split
Resistance to spalling ratio, εBIt is low temperature maximum flexural-tensile strain.
The hot in-plant reclaimed asphalt mixture performance comparison obtained in 8 embodiment 1 of table and comparative example 1
| Index | VV (%) | DS (secondary/mm) | TSR (%) | εB(×10-6) |
| Comparative example 1 | 4.07 | 5701 | 77.4 | 5342 |
| Embodiment 1 | 3.99 | 6090 | 82.8 | 6100 |
Embodiment 2
Gather materials (0~5mm, 5~10mm, the gears of 10~25mm tri-) old to RAP first is sampled, and is then taken out to sample
Propose experiment, experiment measure the old bitumen contents gathered materials of each shelves RAP and RAP is old gather materials in Bituminous concrete surface three norms, test result
As shown in table 9.The old front and back screening results of extracting that gather materials of RAP are as shown in table 10.
Old bitumen content and the three norms of gathering materials of RAP in 9 embodiment 2 of table
In 10 embodiment 2 of table rate result is sieved through before and after the old extractings of gathering materials of RAP
The new predominantly limestone that gathers materials, newly gathers materials as shown in table 11 with the screening result of miberal powder, and old with RAP for gathering materials
Gather materials and carry out the test of relative density, test result is as shown in table 12.
Newly gather materials thick, fine aggregate and miberal powder screening result in 11 embodiment 2 of table
Newly gather materials in 12 embodiment 2 of table and the old density test results of gathering materials of RAP
New pitch selects 70# matrix pitches, and property indices are satisfied by requirement after measured.
To newly gather materials, RAP it is old gather materials, miberal powder carry out AC-25C gradation designs, formate gradation composition meet《Asphalt highway is applied
Work technical specification (JTG F40-2004)》Grading limit requirement.
As shown in Figure 1, Fig. 1 is the preparation method of hot in-plant reclaimed asphalt mixture gradation adding technology of the embodiment of the present invention
Flow chart.By it is above-mentioned newly gather materials, RAP it is old gather materials, new pitch and miberal powder are mixed and stirred according to pitch gradation adding method respectively.Drip
It is as follows that green addition by several times determines that method calculates：
Newly gathered materials and the screening result after the old extractings of gathering materials of each shelves RAP according to each shelves above first, passes through modular formula meter
Each shelves are calculated newly to gather materials and the old specific surface areas gathered materials of each shelves RAP：
SANew 0~3=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3
+0.1229P0.15+0.3277P0.075=0.41+0.0041 × 100+0.0082 × 79.2+0.0164 × 47.9+
0.0287 × 33.4+0.0614 × 21.7+0.1229 × 13.7+0.3277 × 9.8=9.44；
SANew 3~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.80；
SANew 5~10=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.46；
SANew 10~15=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41；
SANew 15~25=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=0.41+0.0041 × 93.8+0.0082 × 65.1+0.0164 × 52.1+0.028 ×
38.2+0.0614 × 15.2+0.1229 × 4.1+0.3277 × 0.6=4.91；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=2.65；
SARAP0~5=0.41+0.0041P4.75+0.0082P2.36+0.0164P1.18+0.0287P0.6+0.0614P0.3+
0.1229P0.15+0.3277P0.075=1.87.
Result of calculation summarizes as shown in table 13.
Newly gather materials in 13 embodiment 2 of table and the old specific surface areas of gathering materials of RAP
According to original RAP it is old gather materials volume be 40% when AC-25C hot recycling mixtures mix-design as a result, root
Can be calculated separately out in hot recycling mixture according to formula I and II newly gather materials, RAP is old gathers materials and overall specific surface area：
The old total specific surface areas gathered materials of 40%RAP：4.91 × 10%+2.65 × 10%+1.87 × 20%=1.12；
The 60% total specific surface newly gathered materials：9.44 × 27%+0.80 × 2.3%+0.46 × 0.2%+0.41 × 0%+
0.41 × 27%=2.68；
Therefore, it is 2.68/ (1.12+2.68)=70% that specific surface area of newly gathering materials, which accounts for overall ratio,.Final calculation result
It is shown in Table 14.
The old volume AC-25C hot recycling mixture specific surface area result of calculations of gathering materials of 40%RAP in 14 embodiment 2 of table
The adding proportion twice of new pitch is determined according to the specific surface area of hot in-plant reclaimed mixture.For the old collection of RAP
Expect the hot in-plant reclaimed mixture of volume 40%, it is 70% that its new specific surface area of gathering materials, which accounts for overall ratio, as shown in Table 14, is
Make newly to gather materials, the old surface of aggregate of RAP wraps the uniform of asphalt membrane thickness, 70% in first step addition new pitch with newly gather materials
It mixes and stirs.
Wherein, each shelves adding proportion of newly gathering materials is：15~25：10~15：5~10：3~5：0~3：Miberal powder=27：2.3：
0.2：0：27：3.5, each old adding proportions gathered materials of shelves RAP are 10~25：5~10：0~5=10:10:20, No. 70 matrix drips
Green bitumen aggregate ratio is 2.36%.
Specifically include following steps：
(1) it will gather materials after being heated to 175 DEG C, and be added to and mix and stir in pot, and mix and stir kettle temperature and be maintained at 165~175 DEG C；
(2) new pitch is heated to 155 DEG C or so, weighs the new pitch that mass fraction is 70% and is added to progress in (1)
First mixes and stirs 90s；
(3) by the old matrix pitches that gather materials and be left 30% of RAP that 2h is preheated under the conditions of 110 DEG C be added in (2) into
Row second mixes and stirs 90s；
(4) it after miberal powder being heated to 175 DEG C, is added to progress third in (3) and mixes and stirs 90s；
(5) mixture after being mixed and stirred obtained by step (4) is taken the dish out of the pot at 155~165 DEG C, is obtained in 150~160 DEG C of moldings
Hot in-plant reclaimed asphalt mixture.
Comparative example 2
Technique is mixed and stirred using conventional, specifically includes following steps, other conditions are identical as in embodiment 2.
(1) it will newly gather materials after being heated to 175 DEG C, be added to and mix and stir in pot, mix and stir kettle temperature and be maintained at 165~175 DEG C；
(2) 90s will be mixed and stirred in the old additions (1) of gathering materials of RAP for preheating 2h under the conditions of 110 DEG C；
(3) new pitch is heated to 155 DEG C or so, is added in (2) and mixes and stirs 90s；
(4) it after miberal powder being heated to 175 DEG C, is added in (3) and mixes and stirs 90s；
(5) mixture after being mixed and stirred obtained by step (4) is taken the dish out of the pot at 155~165 DEG C, is obtained in 150~160 DEG C of moldings
Hot in-plant reclaimed asphalt mixture.
For the plantmix's heat routinely mixed and stirred technique in technique and comparative example 2 and obtained is mixed and stirred in addition by several times in above-described embodiment 2
Reclaimed asphalt mixture carries out the test of indoor marshal piece parameter, and test result is as shown in Table 15.As it can be seen that in embodiment 2
The density that the heat regeneration asphalt mixture marshal piece mixed and stirred under technique is mixed and stirred in gradation addition is more preferable.
Hot in-plant reclaimed asphalt mixture marshal piece parametric results in 15 embodiment 2 of table and comparative example 2
| Technique | Voidage average value (%) | Remarks |
| Comparative example 2 | 4.13 | Four parallel test specimens are made to be averaged |
| Embodiment 2 | 3.95 | Four parallel test specimens are made to be averaged |
Using the factory routinely mixed and stirred technique in technique and comparative example 2 and obtained is mixed and stirred in addition by several times in above-mentioned above-described embodiment 2
It mixes heat regeneration asphalt mixture and carries out dynamic stability test, indirect tensile test on frozen-thaw and low temperature the small beam experiment, test result such as table 16
It is shown.As it can be seen that addition mixes and stirs the performance of the hot in-plant reclaimed asphalt mixture mixed and stirred under technique more to pitch by several times in embodiment 2
It is good.In table, VV is the voidage for being compacted asphalt, and DS is the dynamic stability of asphalt mixture in track test, and TSR is freeze thawing
Ratio of split strength, εBIt is low temperature maximum flexural-tensile strain.
Hot in-plant reclaimed asphalt mixture performance comparison in 16 embodiment 2 of table and comparative example 2
| Index | VV/% | DS (secondary/mm) | TSR (%) | εB(με) |
| Comparative example 2 | 4.13 | 5914 | 69.2 | 4718 |
| Embodiment 2 | 3.95 | 6405 | 73.4 | 5891 |
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to implementations here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (10)
1. a kind of mixing method of hot in-plant reclaimed asphalt mixture, includes the following steps：
1) the old total specific surface areas gathered materials and newly gathered materials of RAP are calculated separately, SA is denoted asRAPAnd SANewly；
The SARAPFor the adduction of each shelves RAP old specific surface area gathered materials and corresponding sieve pore percent of pass product；The SANewlyFor each shelves
The adduction of the specific surface area and its grading accounting product newly gathered materials；According to《Standard specification for construction and acceptance of highway asphalt pavement (JTG F40-
2004)》Middle formula (B.6.9-2) can calculate the specific surface area SA that each shelves gather materials；
2) it new will gather materials and carry out first with first part new pitch after preheating and mix and stir, and obtain the first mixture；
By the RAP after preheating it is old gather materials, remaining new pitch is mixed and stirred with first mixture progress second, obtain the second mixing
Material；
3) the second mixture that miberal powder is obtained with the step 2) is carried out third to mix and stir, obtains hot in-plant reclaimed asphalt mixing
Material；
The mass ratio of a part of new pitch described in the step 2) and total new pitch is SA 'Newly/(SA’Newly+SA’RAP)
SA’RAPAnd SA 'NewlyFormula I and II is respectively adopted to be calculated：
SA’RAP=PRAP1·SARAP1+PRAP2·SARAP2+……+PRAPm·SARAPmFormula I
SA’Newly=P1·SA1+P2·SA2+……+Pn·SAnFormula II
P described in formulaRAP1、PRAP2、……PRAPmGather materials matching in hot in-plant reclaimed asphalt mixture for the old each shelves that gather materials of RAP
Composition and division in a proportion；
The SARAP1、SARAP2、……SARAPmFor the old specific surface area gathered materials of each shelves of RAP, unit m2/kg；
The P1、P2、……PnGather materials the match ratio in hot in-plant reclaimed asphalt mixture for each shelves that newly gather materials；
The SA1、SA2、……SAnFor the specific surface area that each shelves that newly gather materials gather materials, unit m2/kg。
2. mixing method according to claim 1, which is characterized in that old thick, the thin collection to gather materials of RAP in the step 1)
Material meets《Standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004)》With《Asphalt highway regeneration techniques specification (JTG
F41-2008)》Requirement.
3. mixing method according to claim 1, which is characterized in that thick, the fine aggregate that newly gather materials in the step 1)
Meet《Standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004)》Requirement.
4. mixing method according to claim 1, which is characterized in that the new pitch in the step 2) drips for 70# matrix
Green, SBS modified pitch.
5. mixing method according to claim 1, which is characterized in that the miberal powder in the step 3), which is that limestone is levigate, to be obtained
The miberal powder arrived.
6. mixing method according to claim 1, which is characterized in that the preheating temperature newly gathered materials in the step 2) is
165~185 DEG C, the preheating time is 1.5~2h.
7. mixing method according to claim 1, which is characterized in that the first temperature mixed and stirred is 155 in the step 2)
~175 DEG C, the described first time mixed and stirred was 90~110s.
8. mixing method according to claim 1, which is characterized in that the old preheating temperatures gathered materials of RAP in the step 2)
It it is 100~120 DEG C, the preheating time is 1.5~2.5h.
9. mixing method according to claim 1, which is characterized in that the second temperature mixed and stirred is 155 in the step 2)
~175 DEG C, the second time mixed and stirred was 60~90s.
10. according to mixing method as described in any one of claim 1 to 9, which is characterized in that third is mixed and stirred in the step 3)
Temperature be 155~175 DEG C, the time that the third is mixed and stirred be 90~110s.
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| CN110004797A (en) * | 2019-05-14 | 2019-07-12 | 那小东 | A kind of cold addition regeneration asphalt concrete plant mix equipment of multistage subsection mix and method |
| CN112082895A (en) * | 2020-09-18 | 2020-12-15 | 山东大学 | Method for determining effective recovery rate of old asphalt and correcting consumption of new asphalt |
| CN115305774A (en) * | 2022-08-22 | 2022-11-08 | 安徽省公路桥梁工程有限公司 | Cold-throw type plant-mixed hot recycled asphalt concrete production method |
| CN115849766A (en) * | 2022-09-23 | 2023-03-28 | 保利长大工程有限公司 | Processing technology of mixing ratio of regenerant in hot mix plant recycled asphalt |
| US11655189B2 (en) * | 2019-10-18 | 2023-05-23 | Tongji University | Method for preparing hot-mixed asphalt mixture |
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| CN115849766A (en) * | 2022-09-23 | 2023-03-28 | 保利长大工程有限公司 | Processing technology of mixing ratio of regenerant in hot mix plant recycled asphalt |
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