CN107884555A - A kind of RAP gradation verification methods of cold recycled asphalt mixture - Google Patents
A kind of RAP gradation verification methods of cold recycled asphalt mixture Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 143
- 239000000203 mixture Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012795 verification Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 74
- 150000001875 compounds Chemical class 0.000 claims abstract description 73
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000011158 quantitative evaluation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 10
- 238000003801 milling Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 238000004064 recycling Methods 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229960002415 trichloroethylene Drugs 0.000 description 2
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011387 rubberized asphalt concrete Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a kind of RAP gradation verification methods of cold recycled asphalt mixture, comprise the following steps：The deviation between the mass percent to gather materials under each classification of indoor standard compound sample and the mass percent to gather materials under each classification of cold recycled asphalt mixture sample is calculated, while calculates the deviation between the bitumen content of indoor standard compound sample and the bitumen content of cold recycled asphalt mixture sample；Newly add the actual interpolation dosage of pitch according to the bias test between the deviation and the bitumen content of indoor standard compound sample and the bitumen content of cold recycled asphalt mixture sample between the mass percent to gather materials under the mass percent and each classification of cold recycled asphalt mixture sample to gather materials under each classification of indoor standard compound sample, the RAP gradation verifications of cold recycled asphalt mixture are completed, this method can realize the RAP gradation verifications of cold recycled asphalt mixture.
Description
Technical field
The invention belongs to Bituminous Pavement Cold Regeneration technical field, it is related to a kind of RAP level collatings of cold recycled asphalt mixture
Proved recipe method.
Background technology
Bituminous Pavement Cold Regeneration technology by milling and reclaims waste asphalt pavement material as a kind of road maintenance mode
(Reclaimed Asphalt Pavement, abbreviation RAP) and new aggregate is added to meet gradation design requirement, profit under normal temperature
With hydrated cementitious in Cement-Emulsified Asphalt rubber cement, pitch demulsification produces cohesive force and cementing enhancing cohesive force of gathering materials, and passes through construction
Technique and reasonable health, new asphalt flexible structural layer is formed, reduces the generation of reflection crack, close-graded heat can be reached
Performance of asphalt mixture index is mixed, is had and is economized on resources, energy-saving and emission-reduction, saves the advantage such as cost；It is a kind of low-carbon environment-friendly economy
Type pavement maintenance mode.
China's cold recycling technology is started late, and technology application is not yet ripe, and technical system needs complete.Until 2008 4
Month China just release first truly《Asphalt highway regeneration techniques specification》(JTG F41-2008), and the skill
Art simply proposes than broad direction to regeneration techniques.And in the range of each provinces and cities, Jiangxi Province is put into effect within 2010
《Bituminous paving emulsified asphalt cold in-plant recycling technical specification》(DB36/T573-2010) provincial standard；Hebei saves within 2014
Platform《Asphalt highway emulsified asphalt cold in-plant recycling technical specification》(DB 13/T 2020-2014) provincial standard, at present
Cold recycling technology specification appearance for each province is relatively fewer, and lacks the supporting ripe cold recycling technology method of inspection.
According to《Highway engineering pitch and Asphalt Mixture Experiment code》Bitumen content as defined in (JTG E20-2011) is tried
(centrifugal separation) (T0722-1993) and Inspection Method for Mineral Aggregate Grading (T0725-2000) are tested, it mixes hot black top suitable for heat
Asphalt content detection and mineral aggregate gradation when mixture pavement is constructed are examined, to evaluate batching plant's product quality, but for it is cold again
Its defect is just highlighted for raw asphalt, this is due to raw material RAP attributes and construction technology becomes more meticulous degree institute
Cause --- RAP waste materials surface has wrapped Bituminous concrete surface, and milling mechanism can not complete milling, precise restoration old pavement initial level
Match somebody with somebody, therefore the RAP particle diameters that fine aggregate conglomeration causes milling to come out are bigger than normal compared with base mix grading, that is, are that fines is on the low side.Generally
The RAP come out using milling is added new aggregate and carries out Gradation Optimization to meet that level arranges as cold regeneration mix raw material
Meter requires.When carrying out cold regeneration mix gradation verification using traditional experiment code method, using trichloroethylene solvent by RAP
Extract and sieved, in dissolving new pitch simultaneously, the Bituminous concrete surface that RAP surfaces are wrapped also dissolves trichloro ethylene, causes to sieve
The fine aggregate ratio increase branched away, live stage when can not reduce RAP raw material gradation designs are matched somebody with somebody, it is therefore desirable to design one
The kind method of inspection, this method can realize the RAP gradation verifications of cold recycled asphalt mixture, to reduce the arranging of RAP raw material level
The live stage of timing is matched somebody with somebody.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided a kind of cold recycled asphalt mixture
RAP gradation verification methods, this method can realize the RAP gradation verifications of cold recycled asphalt mixture.
To reach above-mentioned purpose, the RAP gradation verifications method of cold recycled asphalt mixture of the present invention is including following
Step：
1) indoor standard compound sample is obtained, then the grading curve of indoor standard compound sample is measured and pitch contains
Amount；
2) the cold recycled asphalt mixture sample with indoor standard compound sample phase homogenous quantities, measurement cold renewal drip are weighed
The grading curve and bitumen content of blue or green compound sample；
3) grading curve and bitumen content of the indoor standard compound sample acquired to step 1) obtain with step 2)
The grading curve and bitumen content of the cold recycled asphalt mixture sample obtained carry out comparison of combined analysis, calculate indoor standard
The mass percent to gather materials under each classification of compound sample and the matter gathered materials under each classification of cold recycled asphalt mixture sample
The deviation between percentage is measured, while calculates bitumen content and the cold recycled asphalt mixture examination of indoor standard compound sample
Deviation between the bitumen content of sample；
4) according to the mass percent and cold recycled asphalt mixture to gather materials under each classification of indoor standard compound sample
The bitumen content of deviation and indoor standard compound sample between the mass percent to gather materials under each classification of sample with it is cold
Bias test between the bitumen content of reclaimed asphalt mixture sample newly adds the actual interpolation dosage of pitch, completes cold renewal drip
The RAP gradation verifications of blue or green compound.
The concrete operations of step 1) are：
The dispensing and mix of compound are carried out according to mix-design in laboratory, obtains indoor standard compound, then claim
Take the indoor standard compound of preset quality to be stripped sieve test as indoor standard compound sample, measure indoor standard
The bitumen content of compound sample, while draw the grading curve of indoor standard compound sample.
The concrete operations of step 2) are：Cold recycled asphalt mixture is obtained from dumper in mixing station, then is positioned over gold
Mixed and stirred in category disk, obtain cold recycled asphalt mixture sample, wherein, cold recycled asphalt mixture sample and indoor standard compound sample
This identical in quality, the then bitumen content of measurement cold recycled asphalt mixture sample, and draw cold recycled asphalt mixture examination
The grading curve of sample.
Also include：The fineness standard grading that gathers materials is carried out according to granule interference theory and Bailey's method model.
The mass percent X to gather materials under the measurement each classification of indoor standard compound sample tries with cold recycled asphalt mixture
The mass percent X to gather materials under each classification of sample1, obtain the mass percent to gather materials under each classification of indoor standard compound sample
The X and mass percent X to gather materials under each classification of cold recycled asphalt mixture sample1Between poor absolute value △ X, and counting chamber
The mass percent X to gather materials under each classification of internal standard compound sample and each classification next part of cold recycled asphalt mixture sample
The mass percent X of material1Deviation △ X/X, then according to the quality gathered materials under each classification of indoor standard compound sample
The percentage X and mass percent X to gather materials under each classification of cold recycled asphalt mixture sample1Deviation △ X/X quantify comment
Estimate the control effect of the cold recycled asphalt mixture grading in work progress.
It should meet during practice of construction：As aggregate size ＞ HS, then △ X/X≤5.5%；When aggregate size exists
When between HS-F1, then △ X/X≤5%；When aggregate size is between F1-0.075, then △ X/X≤4.5%；Work as aggregate size
During less than 0.075, then △ X/X≤3%.
The invention has the advantages that：
The RAP gradation verifications method of cold recycled asphalt mixture of the present invention is in concrete operations, according to indoor mark
The mass percent that gathers materials under the quasi- each classification of compound sample is with gathering materials under each classification of cold recycled asphalt mixture sample
The bitumen content of deviation and indoor standard compound sample between mass percent and cold recycled asphalt mixture sample
Bias test between bitumen content newly adds the actual interpolation dosage of pitch, so as to accurately examine new plus pitch actual interpolation to use
Amount, construction is workable, has very good promotional value and application prospect.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the design sketch of grading curve classification and its mass fraction in the present invention；
Fig. 3 is the accumulation design sketch that gathers materials based on framework dense structure in the present invention；
Fig. 4 a are a kind of tetrahedron gap structure figure that accumulation is formed that gathers materials in Fig. 3；
Fig. 4 b are another tetrahedron gap structure figure that accumulation is formed that gathers materials in Fig. 3；
Fig. 4 c are another tetrahedron gap structure figure that accumulation is formed that gathers materials in Fig. 3；
Fig. 4 d are another tetrahedron gap structure figure that accumulation is formed that gathers materials in Fig. 3.
Wherein, 1,2,3 and 4 represent to form the surface of aggregate of the four direction of gap structure respectively.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The RAP gradation verification methods of cold recycled asphalt mixture of the present invention comprise the following steps：
1) indoor standard compound sample is obtained, then the grading curve of indoor standard compound sample is measured and pitch contains
Amount；
2) the cold recycled asphalt mixture sample with indoor standard compound sample phase homogenous quantities, measurement cold renewal drip are weighed
The grading curve and bitumen content of blue or green compound sample；
3) grading curve and bitumen content of the indoor standard compound sample acquired to step 1) obtain with step 2)
The grading curve and bitumen content of the cold recycled asphalt mixture sample obtained carry out comparison of combined analysis, calculate indoor standard
The mass percent to gather materials under each classification of compound sample and the matter gathered materials under each classification of cold recycled asphalt mixture sample
The deviation between percentage is measured, while calculates bitumen content and the cold recycled asphalt mixture examination of indoor standard compound sample
Deviation between the bitumen content of sample；
4) according to the mass percent and cold recycled asphalt mixture to gather materials under each classification of indoor standard compound sample
The bitumen content of deviation and indoor standard compound sample between the mass percent to gather materials under each classification of sample with it is cold
Bias test between the bitumen content of reclaimed asphalt mixture sample newly adds the actual interpolation dosage of pitch, completes cold renewal drip
The RAP gradation verifications of blue or green compound.
The concrete operations of step 1) are：The dispensing and mix of compound are carried out according to mix-design in laboratory, is obtained
Indoor standard compound, then weigh the indoor standard compound of preset quality and be stripped sieve as indoor standard compound sample
Separating tests, measure the bitumen content of indoor standard compound sample, while draw the grading curve of indoor standard compound sample.
The concrete operations of step 2) are：Cold recycled asphalt mixture is obtained from dumper in mixing station, then is positioned over gold
Mixed and stirred in category disk, obtain cold recycled asphalt mixture sample, wherein, cold recycled asphalt mixture sample and indoor standard compound sample
This identical in quality, the then bitumen content of measurement cold recycled asphalt mixture sample, and draw cold recycled asphalt mixture examination
The grading curve of sample.
Present invention additionally comprises：Under the measurement each classification of indoor standard compound sample the mass percent X that gathers materials with it is cold again
The mass percent X to gather materials under each classification of raw asphalt sample1, obtain each classification next part of indoor standard compound sample
The mass percent X of the material and mass percent X to gather materials under each classification of cold recycled asphalt mixture sample1Between it is poor absolute
Value △ X, and calculate the mass percent X to gather materials under each classification of indoor standard compound sample and tried with cold recycled asphalt mixture
The mass percent X to gather materials under each classification of sample1Deviation △ X/X, then according to each point of indoor standard compound sample
The mass percent X to gather materials under level the and mass percent X to gather materials under each classification of cold recycled asphalt mixture sample1Deviation
The control effect of value △ X/X quantitative evaluations cold recycled asphalt mixture grading in work progress, should during practice of construction
Meet：As aggregate size ＞ HS, then △ X/X≤5.5%；When aggregate size is between HS-F1, then △ X/X≤5%；When
When aggregate size is between F1-0.075, then △ X/X≤4.5%；When aggregate size is less than 0.075, then △ X/X≤3%.
Present invention additionally comprises the fineness standard grading that gathers materials is carried out according to granule interference theory and Bailey's method model, specifically
For：By U.S.'s Superpave theoretical calculations, according to coarse aggregate own form and the difference degree of size, coarse aggregate compact reactor
Tetrahedron is substantially presented in the gap structure formed after product, and the three-dimensional void size formed between coarse aggregate is about itself grain that gathers materials
0.16-0.28 times of footpath, it is 0.22 to take average multiplying power, therefore thickness grading standard of gathering materials is set to 0.22, wherein, the first order is gathered materials
Thickness boundary is F1=NMPS × 0.22, (NMPS is nominal maximum aggregate size)；The second level gather materials thickness boundary for F2=F1 ×
0.22；Third level thickness boundary of gathering materials is F3=F2 × 0.22；By that analogy；Gather materials more than thickness boundary F1 in the first order simultaneously
Coarse aggregate in the range of, coarse aggregate is divided using half grade of standard, i.e. HF=NMPS × 0.5, it is thick to divide with this standard
Relatively thick and thinner part in gathering materials, aggregate grading standard are summarized in table 1.
Table 1
| NMPS(mm) | ATB-30(mm) | AC-25(mm) | AC-20(mm) | AC-16(mm) |
| HS(mm) | 15 | 12.5 | 10 | 8 |
| F1(mm) | 6.6 | 5.5 | 4.4 | 3.52 |
| F2(mm) | 1.45 | 1.21 | 0.97 | 0.77 |
| F3(mm) | 0.32 | 0.27 | 0.21 | 0.17 |
| F4(mm) | ＜ 0.075 | ＜ 0.075 | ＜ 0.075 | ＜ 0.075 |
Nominal maximum aggregate size based on step 3) determines aggregate grading standard, and by taking AC-20 (mm) as an example, the pitch contains
Amount, aggregate quality percentage and its deviation, stepping classification opposite joining relation are summarized in table 2 below.
Table 2
By taking the AC-20 (mm) in table 1 as an example, incorporation engineering feature is believed that △ A as new aggregate and difference common RAP,
△ F are mainly the difference of miberal powder, and △ L represent the difference of total bitumen content, and functional relation is expressed as follows：
△ L=△ LL+△LR (1)
△LL=(the new aggregates of △ A- △) × LL10-20mm+△B×LL5-10mm+(△C+△D+△E)×LL0-5mm (2)
Wherein, LL10-20mm、LL5-10mm、LL0-5mmFor Bituminous concrete surface content in engineering each shelves RAP that extraction test measures early stage；
The new aggregates of △ draw according to engineering grade with ratio, generally 50% △ A.
△ L can be calculated by formula (2)L, by △ LLSubstitution formula (1) can obtain △ LR, can examine newly add pitch reality accordingly
Dosage.
Embodiment one
The method of inspection of the present invention has carried out effective checking by lot of experiments, as Foshan highway first drips emulsification
Blue or green cold in-plant recycling technology is applied in the maintenance engineering of Asphalt Pavement Base and cutting optimal；But existing milling equipment
Road-surface milling thoroughly can not be returned into base mix grading limit completely, and the Bituminous concrete surface on RAP milling materials surface also can be to thin collection
Material conglomeration makes a significant impact, therefore existing gradation verification method is not applied for cold recycling technology, it would be highly desirable to a kind of special applicable
Cold recycled asphalt mixture RAP gradation verification methods, use the present invention specific operation process for：
1) dispensing is carried out in strict accordance with detail design match ratio in laboratory, detail design match ratio is as shown in table 3.
Table 3
2) according to the time as defined in testing regulations, compound is mixed and stirred 90 seconds, mixed and stirred using pitch combined amount mixing apparatus
Indoor standard compound sample is obtained after uniformly, the indoor standard compound sample for weighing certain mass is stripped screening examination
Test, and follow strictly《Highway engineering pitch and Asphalt Mixture Experiment code》Bitumen content as defined in (JTG E20-2011) is tried
Test (centrifugal separation) (T0722-1993) to carry out with the test procedure in Inspection Method for Mineral Aggregate Grading (T0725-2000), measure
The bitumen content (including Bituminous concrete surface content and the emulsified asphalt content newly added in RAP) of indoor standard compound sample and interior
The grading curve of standard mix sample, in this, as indoor benchmark reference group.
3) cold recycled asphalt mixture sample is obtained when mixing station discharges from dumper, cold recycled asphalt mixture is tried
Sample is placed in metal dish and suitably mixed and stirred, and then weighs and is stripped sieve with the cold recycled asphalt mixture sample of indoor phase homogenous quantities
Divide, measure the bitumen content of cold recycled asphalt mixture sample and the gradation composition of cold recycled asphalt mixture sample, then will
The gradation composition of cold recycled asphalt mixture sample indoor standard compound sample and bitumen content carry out comparison of combined analysis, point
It is as shown in table 4 to analyse result：
Table 4
4) the fineness standard grading that gathers materials is carried out based on granule interference theory and Bailey's method model, by the U.S.
Superpave theoretical calculations, thickness grading standard of gathering materials is set as 0.22, wherein, first order thickness boundary of gathering materials is F1=
NMPS × 0.22, (NMPS is nominal maximum aggregate size)；Second level thickness boundary of gathering materials is F2=F1 × 0.22；The third level is gathered materials slightly
Thin boundary is F3=F2 × 0.22, and so on.Simultaneously the first order gather materials more than thickness boundary F1 coarse aggregate in the range of,
Coarse aggregate is divided using half grade of standard, i.e. HF=NMPS × 0.5, with this standard come divide in coarse aggregate it is relatively thick and
Thinner part；It is 20mm to learn that engineering selects the nominal maximum aggregate size that gathers materials according to table 3, then the RAP aggregate gradings index such as institute of table 5
Show.
Table 5
| NMPS(mm) | HS(mm) | F1(mm) | F2(mm) | F3(mm) | F4(mm) |
| 20 | 10 | 4.4 | 0.97 | 0.21 | ＜ 0.075 |
5) with step 7) synchronization implementation：Nonlinear fitting is carried out to grading curve using Excel softwares, calculated respectively each
The lower indoor and outdoor aggregate quality percentage of classification, the difference and deviation of mass percent, according to the maximum nominal grain of RAP in compound
Footpath, corresponding grading range, which will gather materials, carries out thickness stepping, and aggregate grading is summarized in table 6 with stepping.
Table 6
Mass fraction difference as can be seen that in the actual mixing compound of mixing station, launch by 10-20mm shelves coarse fodder from table 6
Amount fewer than design flow 1.45；Injected volume fewer than design flow 0.97 is expected in 5-10mm shelves；0-5mm shelves fines injected volumes are more than design flow
0.36+0.76-1.03=0.09；Miberal powder amount ratio design flow more 0.73.
6) consider to mix and stir in construction technology, influence of the factor to mixture segregation degree, the deviation such as paving process should reach
To following established standardses：As aggregate size ＞ HS, △ X/X≤5.5% should be met；, should when aggregate size is between HS-F1
Meet △ X/X≤5%；When aggregate size is between F1-0.075, △ X/X≤4.5% should be met；When aggregate size is less than
When between 0.075, △ X/X≤3% should be met；Construction quality is control effectively with this index.Can from the deviation of table 6
Go out, 10-20mm shelves coarse fodders deviation is 5.11%, less than 5.5% Con trolling index；Material deviation is in same 5-10mm shelves
4.72%, less than 5% Con trolling index, the grading particle composition to gather materials in showing slightly can meet index request；And 0-5mm shelves fineves
Deviation is respectively 5.14%, 4.57%, 4.88%, beyond 4.5% Con trolling index scope；Miberal powder deviation more reaches
As many as 10.43%, it is relevant that this may lead fines grading change with hydrated product, therefore illustrates in cold regeneration mix plantmix,
More should priority control to the injected volume of fines.
8) bitumen content measured according to the extraction test of table 6, incorporation engineering actual features, △ A are that new aggregate and RAP are common
Difference, △ F are the difference of miberal powder, and △ L represent the difference of total bitumen content, and functional relation is expressed as follows：
△ L=△ LL+△LR (1)
△LL=(the new aggregates of △ A- △) × LL10-20mm+△B×LL5-10mm+(△C+△D+△E)×LL0-5mm (2)
Wherein, LL10-20mm、LL5-10mm、LL0-5mmFor Bituminous concrete surface content in engineering each shelves RAP that extraction test measures early stage,
Respectively 4.02%, 4.7%, the new aggregates of 6.24%, △ according to engineering grade be 58.3% △ A with ratio.
First, it is 7.7% that indoor benchmark reference group extraction test, which measures total bitumen content, and old drip is can be calculated by formula (2)
Blue or green content is 4.19%, and bitumen content during indoor design is 3.5%, and data are substituted into formula (1) meets functional relation, therefore
Demonstrate the reasonable reliability of the present invention.Secondly, outdoor comparison test group is repeated the above steps, measuring total bitumen content is
7.9%, can be calculated Bituminous concrete surface content by formula (2) is 4.13%, substitutes into formula (1), and it is 3.77% to obtain emulsified asphalt actual amount,
0.27 more than designed content of asphalt, its deviation is 7.71%, and the result to sum up calculated is understood, is discharged in actual mixing building
When, Asphalt emulsion content should be suitably reduced, result of calculation is summarized in table 6.
Claims (6)
1. a kind of RAP gradation verification methods of cold recycled asphalt mixture, it is characterised in that comprise the following steps：
1) indoor standard compound sample is obtained, then measures the grading curve and bitumen content of indoor standard compound sample；
2) the cold recycled asphalt mixture sample with indoor standard compound sample phase homogenous quantities is weighed, measurement cold recycled asphalt mixes
Close the grading curve and bitumen content of material sample；
3) grading curve and bitumen content of the indoor standard compound sample acquired to step 1) obtain with step 2)
The grading curve and bitumen content of the cold recycled asphalt mixture sample arrived carry out comparison of combined analysis, calculate indoor standard mixing
The mass percent to gather materials under the material each classification of sample and the quality hundred gathered materials under each classification of cold recycled asphalt mixture sample
Deviation between fraction, while calculate the bitumen content and cold recycled asphalt mixture sample of indoor standard compound sample
Deviation between bitumen content；
4) according to the mass percent to gather materials under each classification of indoor standard compound sample and cold recycled asphalt mixture sample
The bitumen content and cold renewal of deviation and indoor standard compound sample between the mass percent to gather materials under each classification
Bias test between the bitumen content of asphalt sample newly adds the actual interpolation dosage of pitch, completes cold recycled asphalt and mixes
Close the RAP gradation verifications of material.
2. the RAP gradation verification methods of cold recycled asphalt mixture according to claim 1, it is characterised in that step 1)
Concrete operations be：
Dispensing and mix are carried out according to mix-design in laboratory, obtains indoor standard compound, then weigh preset quality
Indoor standard compound is stripped sieve test as indoor standard compound sample, measurement indoor standard compound sample
Bitumen content, while draw the grading curve of indoor standard compound sample.
3. the RAP gradation verification methods of cold recycled asphalt mixture according to claim 1, it is characterised in that step 2)
Concrete operations be：Cold recycled asphalt mixture is obtained from dumper in mixing station, then is positioned in metal dish and is mixed and stirred,
Cold recycled asphalt mixture sample is obtained, wherein, the quality phase of cold recycled asphalt mixture sample and indoor standard compound sample
Together, the bitumen content of cold recycled asphalt mixture sample is then measured, and the level for drawing cold recycled asphalt mixture sample is write music for a song
Line.
4. the RAP gradation verification methods of cold recycled asphalt mixture according to claim 1, it is characterised in that also include：
The fineness standard grading that gathers materials is carried out according to granule interference theory and Bailey's method model.
5. the RAP gradation verification methods of cold recycled asphalt mixture according to claim 1, it is characterised in that measuring chamber
The mass percent X to gather materials under each classification of internal standard compound sample and each classification next part of cold recycled asphalt mixture sample
The mass percent X of material1, obtain the mass percent X and cold recycled asphalt to gather materials under each classification of indoor standard compound sample
The mass percent X to gather materials under each classification of compound sample1Between poor absolute value △ X, and calculate indoor standard compound
The mass percent X to gather materials under each classification of sample and the quality percentage to gather materials under each classification of cold recycled asphalt mixture sample
Number X1Deviation △ X/X, then according to the mass percent X that gathers materials under each classification of indoor standard compound sample with it is cold again
The mass percent X to gather materials under each classification of raw asphalt sample1Deviation △ X/X quantitative evaluations in work progress
The control effect of cold recycled asphalt mixture grading.
6. the RAP gradation verification methods of cold recycled asphalt mixture according to claim 5, it is characterised in that in reality
It should meet in work progress：As aggregate size ＞ HS, then △ X/X≤5.5%；When aggregate size is between HS-F1, then △
X/X≤5%；When aggregate size is between F1-0.075, then △ X/X≤4.5%；When aggregate size is less than 0.075, then △
X/X≤3%.
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