CN101654347A - Hot in-plant reclaimed asphalt mixture - Google Patents
Hot in-plant reclaimed asphalt mixture Download PDFInfo
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- CN101654347A CN101654347A CN200910183137A CN200910183137A CN101654347A CN 101654347 A CN101654347 A CN 101654347A CN 200910183137 A CN200910183137 A CN 200910183137A CN 200910183137 A CN200910183137 A CN 200910183137A CN 101654347 A CN101654347 A CN 101654347A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 118
- 239000000203 mixture Substances 0.000 title claims abstract description 87
- 239000000463 material Substances 0.000 claims abstract description 115
- 238000012360 testing method Methods 0.000 claims abstract description 77
- 238000003801 milling Methods 0.000 claims abstract description 63
- 239000012492 regenerant Substances 0.000 claims abstract description 6
- 239000011295 pitch Substances 0.000 claims description 40
- 238000011069 regeneration method Methods 0.000 claims description 35
- 230000008929 regeneration Effects 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 13
- 238000013112 stability test Methods 0.000 claims description 13
- 230000035515 penetration Effects 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 238000010257 thawing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 229940126062 Compound A Drugs 0.000 claims 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 8
- 239000011707 mineral Substances 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000003672 processing method Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 13
- 239000002344 surface layer Substances 0.000 description 9
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 230000002596 correlated effect Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- JLQUFIHWVLZVTJ-UHFFFAOYSA-N carbosulfan Chemical compound CCCCN(CCCC)SN(C)C(=O)OC1=CC=CC2=C1OC(C)(C)C2 JLQUFIHWVLZVTJ-UHFFFAOYSA-N 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a hot in-plant reclaimed asphalt mixture. The mixture includes the following components by mass percent: 30 to 50 percent of milling materials, 44 to 67 percent of newly collected materials, 1.5 to 4 percent of mineral powder, 1.5 to 4 percent of new asphalt, and ARA regenerant which is 0 to 10 percent of the mass of the recycled asphalt contained in the milling materials.The processing method includes the following steps: (1) extraction and analysis of the milling materials; (2) asphalt performance test; (3) regenerant addition; (4) formation of mixture of the recycled asphalt; (5) Marshall test or rotary compacting test; and (6) mixture performance test. The proportion of milling material RAP reaches as high as 50 percent in the engineering application of the hot recycled asphalt mixture, the milling material RAP can be applied to a middle layer, and the proportion is higher than the proportions of other hot recycled mixtures by more than 20 percent. The mixture can be applied to various grades, such as the AC type, SUPERPAVE, and the like, and the RAP proportion can respectively reach 30 percent or even more than 50 percent. When the mixture is used forpaving a road surface, the road performance can respectively meet the requirements on performance of a newly proportioned asphalt mixture, and the high temperature performance is even superior to thenewly proportioned asphalt mixture. Therefore, the invention has obvious economic benefit.
Description
Technical field
The present invention relates to the road surfacing compound, relate in particular to a kind of hot in-plant reclaimed asphalt mixture.
Background technology
Highway in China develops rapidly through more than ten years, will have a large amount of bituminous pavements to enter big or middle repairing the phase.Asphalt pavement regeneration is compared with traditional asphalt pavement maintenance mode, can save starting material such as a large amount of pitch, sandstone, saves construction investment, helps handling waste material, protection environment simultaneously, thereby has remarkable economic efficiency and social, environmental benefit.Along with the concern of people to environmental protection, social benefit, and development of technology, asphalt pavement regeneration utilizes technology more and more to be subject to people's attention.
The kind of asphalt pavement regeneration technology is more, and heat plant to mix regeneration be the asphalt pavement regeneration method that is most widely used in the world at present, a large amount of research has also been done at this technology in many in the world countries and regions.In China, at present highway still is in large-scale construction period, and is relatively weak to the degree of concern of the maintenance of highway and regeneration aspect.Though mixing regeneration, heat plant carried out certain research in indivedual provinces and cities, equipment component manufacturers has also developed heat plant and has mixed regenerated equipment, the equipment and the method for external comparative maturity attempted to quote by some units and mechanism, but owing to reasons such as weather condition, starting material character and operating techniquies, effect is unsatisfactory.Generally speaking, owing to lack the analysis and the proven technique of system, can't under a large amount of situations of utilizing waste material, produce a kind of well behaved hot-mix asphalt mixture at present at home.
Summary of the invention
The purpose of the present invention's invention is to provide a kind of hot in-plant reclaimed asphalt mixture, this compound reaches 30% even at 50% o'clock reclaiming the bituminous aspect ratio, by the technology set and add ARA regenerator (patent No. ZL 200810122668.8) and can reach or the approaching performance requriements of newly mixing asphalt through hot in-plant reclaimed back asphalt, its technical scheme is as follows:
Described hot in-plant reclaimed asphalt mixture, comprise following mass percent composition: the ARA regenerator of contained recovery asphalt quality 0～10% in 30%～50% milling material, 44%～67% newly gather materials, 1.5%～4% breeze, 1.5%～4% new pitch and the described milling material.
The working method of described hot in-plant reclaimed asphalt mixture comprises the steps:
1) extracting of milling material is analyzed
The sampling of milling material, extracting separates with bituminous to adopt A Busenfa or rotatory evaporator method that this sample is gathered materials, and measures the bitumen aggregate ratio of described milling material;
2) asphalt performance detects
Above-mentioned extractive recovery pitch is carried out penetration degree, ductility, softening temperature, viscometric properties index to be measured;
3) add regenerator
One of following three kinds of situations need to add ARA regenerator: a, extractive recovery pitch detect in 25 ℃ of penetration degrees less than 35 (0.1mm), 60 ℃ of viscosity were greater than 1000PaS during b, regeneration asphalt detected, the volume of c, milling material is greater than 30%,
When needing to add regenerator, according to described recovery asphaltic nature index, and above-mentioned with in reclaim the bituminous quality than scope in, preliminary definite one group of regenerant consumption, pitch is reclaimed in each consumption in this group regenerant consumption and sampling to be mixed and stirred, when mixing and stirring, adding load weighted regenerator to 140 ℃～155 ℃ reclaims in the pitch, and constantly stir 30～60min, form one group of regeneration asphalt sample, to this group regeneration asphalt sample and carry out property testing,, determine the consumption of the regenerator of described reclaimed asphalt mixture according to this property testing result with the new pitch of label;
4) form reclaimed asphalt mixture
To the milling material, newly gather materials, breeze carries out level and fits in, newly gather materials and the milling material heat respectively, the Heating temperature of newly gathering materials is about 190～210 ℃, about 120～140 ℃ of milling material Heating temperatures, to being heated to first dry mixing 25～35s of newly gathering materials of assigned temperature, add the milling material again and mix and stir 55～65s, add load weighted new pitch afterwards and mix and stir 55～65s, add load weighted breeze at last, mix and stir 25～35s again, add regenerator as need, load weighted regenerator is added in 140 ℃～155 ℃ new pitches in advance, and constantly stir 30～60min; Mix and stir temperature and be generally 155～165 ℃ or definite by viscosity-temperature curve according to the viscosity requirement;
5) Marshall Test or gyratory compaction test
Select certain bitumen aggregate ratio to make test specimen as examination level adapted bitumen aggregate ratio, carry out the test of Marshall Test or gyratory compaction, requiring voidage VV is 3～6%, saturation ratio VFA65～75%;
6) Performance Detection of compound
A. water stability check
The immersion Marshall stability test, residual stability MS
0〉=80%,
The freeze thawing split test, retained strength is than TSR 〉=75%
B. thimble test
The wheel tracking test dynamic stability test, rut dynamic stability 〉=1000 time/mm;
C. low-temperature stability test
Under-10 ℃ of conditions, carry out the low-temperature stability of girder pliability test with the check asphalt.Require regenerating mixture breaking strain 〉=2500 μ ε.
Aforesaid method further designs and is, reclaims bituminous character index and is set at respectively: penetration degree is for being 25 ℃ in temperature, 100g, and during 5s, its value is 60～80 (0.1mm); Ductility is for when temperature is 15 ℃, greater than 100cm; Softening temperature is 44～54 ℃; Viscosity is for when temperature is 60 ℃, and its value is not less than 180Pa.s.
Aforesaid method further designs and is, in-12 ℃ of low-temperature bending beam rheological tests of regeneration asphalt, and stiffness＜300Mpa, creep speed＞0.300m.
The volume of milling material RAP had been up to 50% during heat regeneration asphalt mixture engineering of the present invention was used, and can be applied to middle surface layer, improved more than 20% than other hot regenerating mixture RAP volumes.Simultaneously can be applied to multiple gratings such as AC type, SUPERPAVE, and the RAP volume can be used more than 30% even 50% all.With compound road surface pavement of the present invention, its pavement performance all can reach the performance requriements of newly mixing asphalt, high-temperature behavior even be better than newly mixing asphalt.Therefore, the present invention has tangible economic benefit: can save the cost of building the road in a large number, if pitch is by 3100 yuan/T, 23 yuan/T of graded broken stone, RAP calculates by 24 yuan/T, and then the RAP volume is 30% o'clock, and 1000 tons of Petroleum Asphalt Mixture for Road Lower of every use can be used 300 tons of RAP materials, can save 39894 yuan, promptly adopt 30% ratio RAP material to regenerate and to save the direct expenses of 39894/162105=24.6%.When the RAP volume increases to 50%, need to add the regenerator of old asphalt content 10%, the regenerator price is about 15000 yuan/T, 1000 tons of Petroleum Asphalt Mixture for Road Lower of every use can be used 500 tons of RAP materials, can save 32308 yuan, promptly adopt 50% ratio RAP material to mix the regenerated mode and regenerate and to save the expense of 32308/162105=19.9%.Add and consider transportation and sapce charge usefulness, use every 1000T old asphalt mixture indirectly cost saving be 17562 yuan.Have obvious social simultaneously, rationally utilize construction waste, the protection environment.Meet the save energy resource that the 17th Session of the General Assembly proposes and the requirement of the consumption mode of preserving the ecological environment, help to realize the conservation culture construction, develop the economy, the national development strategy of environmental protection, saving and friendly type society.
Description of drawings
Fig. 1 is the regeneration asphalt viscosity-temperature curve test-results figure of embodiment 1.
Fig. 2 is the milling material of embodiment 1, newly gathers materials and the synthetic examination graduation curve figure of three kinds of material of breeze.
Fig. 3 is the milling material of embodiment 2, newly gathers materials and the synthetic examination graduation curve figure of three kinds of material of breeze.
Embodiment
The present invention will be further described below in conjunction with specific examples.
Related ARA regenerator is by a Jiangsu Province Research Institute of Communication development patented technology (patent No. ZL 200810122668.8) among the following embodiment, and addition is not more than 10% of contained recovery asphalt quality in the used milling material.
Embodiment 1
The project profile of present embodiment is: mix the hot in-plant reclaimed AC-25S type of regenerator asphalt test section and be selected in surface layer under the wire of Binjiang development area, Jiangning, Nanjing, engineering adopts the Class I highway standard, two-way six-lane, 80 kilometers/hour of design speed per hours, the pavement structure form adopts: 4cm asphalt (AC-13C)+5cm asphalt (AC-20S)+7cm asphalt (AC-25S), regeneration zone is following surface layer, and milling material volume is 50%.Following surface layer adopts heat regeneration asphalt mixture of the present invention
Adopt A Busenfa to gather materials and bituminous extracting decomposition run at first to the sampling of milling material, and to this sample.Gathering materials through the screening of 2.36mm screen cloth after the extracting of milling material is divided into coarse aggregate and fine aggregate two portions, respectively it carried out density test then, and measured the bitumen aggregate ratio of this milling material, sees also table 1-1, table 1-2.
The extraction test result of table 1-1 asphalt
Density test table as a result gathers materials after the extracting of table 1-2RAP material
| Mineral aggregate | Volume density (g/cm 3) | Bulk density (g/cm 3) | Water-intake rate (%) |
| Coarse fodder | ??2.730 | ??2.686 | ??0.60 |
| Fines | ??2.722 | ??2.644 | ??1.08 |
To the character index determining that above-mentioned extractive recovery pitch is correlated with, detect new bituminous character simultaneously with label, its result is as table 1-3, and new bituminous viscosity-temperature curve is seen Fig. 1.
Table 1-3 regeneration asphalt technical indicator detected result
Because the volume of milling material is greater than 30%, so need to add the ARA regenerator.Reclaim technical indicators such as pitch penetration degree and viscosity according to above-mentioned table 1-3, in the scope of described and the mass percent 0～10% that reclaims drop, set 8%, 9%, 10% 3 kind of addition.The ARA regenerator of these three kinds of additions is reclaimed pitch with corresponding sampling respectively to be mixed and stirred.When mixing and stirring, add load weighted regenerator to 135～145 ℃ and reclaim in the pitch, and constantly stir 30min., carry out character index tests such as penetration degree, viscosity, wherein have only the regeneration asphalt performance index of regenerator volume 10% can reach code requirement, therefore consider that from aspect of performance the ARA regenerator is chosen 10% volume.The correlation technique index of its regeneration asphalt sees Table 1-3.
Newly gathering materials is limestone when real estate, and the key technical indexes such as its crush values, wear(ing)value, silt content, water-intake rate detect through overtesting and all satisfy code requirement, and breeze is ground by limestone and forms.
To the milling material, newly gather materials, breeze carries out level and fits in, formate gradation composition satisfies the grading limit requirement of " JTG D50-2006 asphalt highway design specifications ", the formate gradation composition of three kinds of mineral aggregates sees Table 1-4, the examination graduation curve is seen Fig. 2.To newly gathering materials and the milling material heats respectively, the Heating temperature of newly gathering materials is at 190～210 ℃, 120～140 ℃ of milling material Heating temperatures.Because need to add regenerator, therefore load weighted regenerator will be added to before compound mixes and stirs in 140 ℃～155 ℃ new pitches in advance earlier, and constantly stir 30min; To being heated to first dry mixing 25s of newly gathering materials of assigned temperature, add the milling material again and mix and stir 55s, add the load weighted new pitch that contains regenerator afterwards) mix and stir 55s, add load weighted breeze at last and mix and stir 25s again, mixing and stirring temperature is 155～165 ℃ or definite by the viscosity-temperature curve of Fig. 1 according to the viscosity requirement.
The formate gradation composition percent of pass particular sheet of three kinds of mineral aggregates of table 1-4
The heat regeneration asphalt mixture that above-mentioned warp is is fully mixed and stirred carries out following Marshall Test.With reference to the engineering applicable cases of surface layer AC-25 Target Mixture Ratio under the bituminous pavement in the past, select bitumen aggregate ratio 4.0% as an examination level adapted bitumen aggregate ratio, two-sidedly respectively hit real 75 moulding marshal pieces.The Marshall Test result is shown in table 1-5.
Table 1-5 Marshall Test is summary sheet as a result
The milling material of above-mentioned grating, newly gather materials, heat regeneration asphalt mixture that breeze obtains through above-mentioned mix, formate gradation composition according to table 1-4, through calculate newly gather materials account for total mixture quality 46%, contents of ground slag accounts for 1.6%, milling material volume is 50%, new asphalt content accounts for 2.2% of total mixture quality, and ARA regenerator volume is as mentioned above for reclaiming 10% of asphalt content in the milling material.
Above-mentioned heat regeneration asphalt mixture is carried out Performance Detection
1. water stability check, the water stability energy of design asphalt is checked in soak Marshall Test and freeze thawing split test of grating when according to above-mentioned oilstone.Test-results sees Table 1-6 and table 1-7 respectively.
Table 1-6 immersion Marshall stability test result
Table 1-7 freeze thawing split test result
2, thimble test
Test conditions: at 60 ± 1 ℃, carry out the high-temperature stability of wheel tracking test with the check asphalt under 0.7 ± 0.05MPa condition, the dynamic stability test result sees Table respectively shown in 1-8 and the table 1-9.
Table 1-8 wheel tracking test dynamic stability
Table 1-9 rut test piece voidage summary sheet
3, low-temperature stability test
Test conditions: carry out the low-temperature stability of girder pliability test with the check asphalt under-10 ℃ of conditions, test-results sees Table 1-10.
Table 1-10 low-temperature bending test
Embodiment 2
It is surface layer that the hot in-plant reclaimed asphalt mixture of present embodiment also is used for the regeneration zone position.The milling material volume of this reclaimed asphalt mixture accounts for 40% of total mass.Surface layer adopts heat regeneration asphalt mixture of the present invention promptly.
Adopt the rotatory evaporator method to gather materials and bituminous extracting decomposition run at first to the sampling of milling material, and to this sample.Gathering materials through the screening of 2.36mm screen cloth after the extracting of milling material is divided into coarse aggregate and fine aggregate two portions, and its grating and bitumen aggregate ratio see also table 2-1.
The extraction test result of table 2-1 asphalt
The mensuration of the character index that above-mentioned extractive recovery pitch is correlated with detects the new bituminous character with label simultaneously, and its result is as table 2-2.
Table 2-2ARA regeneration asphalt technical indicator detected result
Because the volume of milling material is greater than 30%, so need to add the ARA regenerator, reclaim technical indicators such as pitch penetration degree and viscosity according to above-mentioned table 2-2, in the scope of described and the mass percent 0～10% that reclaims drop, set 4%, 5%, 6% 3 kind of addition.The ARA regenerator of these three kinds of additions is reclaimed pitch with corresponding sampling respectively to be mixed and stirred.When mixing and stirring, add load weighted regenerator to 135 ℃～145 ℃ and reclaim in the pitch, and constantly stir 60min.Carry out character index tests such as penetration degree, viscosity, wherein regenerator volume 5% and 6% regeneration asphalt performance index all can reach code requirement, because regenerator costs an arm and a leg, from economic considerations, choose the ARA regenerator of 5% volume, the correlation technique index of its regeneration asphalt sees Table 2-2.
Newly gathering materials is limestone when real estate, and the key technical indexes such as its crush values, wear(ing)value, silt content, water-intake rate detect through overtesting and all satisfy code requirement.The breeze that filler adopts limestone to wear into all satisfies the technical requirements that standard proposes.
To the milling material, newly gather materials, breeze carries out level and fits in, formate gradation composition requires to satisfy " JTG D50-2006 asphalt highway design specifications " grading limit requirement.The formate gradation composition of three kinds of mineral aggregates sees Table 2-3, and the examination graduation curve is seen Fig. 3.To newly gather materials and the milling material heat respectively, the Heating temperature of newly gathering materials about 190～210 ℃, about 120～140 ℃ of milling material Heating temperatures.Because need to add regenerator, therefore load weighted regenerator will be added to before compound mixes and stirs in 140 ℃～155 ℃ new pitches in advance earlier, and constantly stir 60min; To being heated to first dry mixing 30s of newly gathering materials of assigned temperature, add the milling material again and mix and stir 60s, add load weighted new pitch (having added regenerator) afterwards and mix and stir 60s,, last load weighted interpolation breeze mixes and stirs 30s, and mixing and stirring temperature is 155～165 ℃;
The design grating of table 2-3AC-20 type asphalt
The heat regeneration asphalt mixture that above-mentioned warp is is fully mixed and stirred carries out the following test of Marshall Test.With reference to the engineering applicable cases of surface layer AC-20 Target Mixture Ratio under the bituminous pavement in the past, select bitumen aggregate ratio 4.0% as an examination level adapted bitumen aggregate ratio, making type marshal piece.The Marshall Test result is shown in table 2-4.
Table 2-4 Marshall Test result
The milling material of above-mentioned grating, newly gather materials, heat regeneration asphalt mixture that breeze obtains through above-mentioned mix, through calculate newly gather materials account for total mixture quality 55.3%, new pitch accounts for 2.4%, contents of ground slag accounts for 2.2%, milling material volume is 40%, ARA regenerator volume is to reclaim 5% of asphalt content in the milling material.
Above-mentioned heat regeneration asphalt mixture is carried out Performance Detection
1. water stability check, the water stability energy of design asphalt is checked in soak Marshall Test and freeze thawing split test of grating when according to above-mentioned oilstone.Test-results sees Table 2-5 and table 2-6 respectively.
Table 2-5 immersion Marshall Test
Table 2-6 freeze thawing split test
2, thimble test
Test conditions: at 60 ± 1 ℃, carry out the high-temperature stability of wheel tracking test with the check asphalt under 0.7 ± 0.05MPa condition, dynamic stability test the results are shown in Table 2-7.
Table 2-7 wheel tracking test
3, low-temperature stability test
Test conditions: carry out the low-temperature stability of girder pliability test with the check asphalt under-10 ℃ of conditions, test-results sees Table 2-8.
Table 2-8 low-temperature bending test
Embodiment 3
Test section is chosen in Jiangning District Dongshan, Nanjing to the kylin highway, and starting point is a grand fortune main road construction terminal point, strides the Ningbo-Hangzhou motorway eastwards, terminal point and the kylin town Lu Shunjie that opens the city gate, and the route whole audience is about 9.7km.Hot in-plant reclaimed asphalt mixture SUP-20 is mainly used in middle surface layer.The milling material RAP volume of this reclaimed asphalt mixture accounts for 30% of total mass, does not add regenerator.
Adopt the rotatory evaporator method to gather materials and bituminous extracting decomposition run at first to milling material RAP sampling, and to this sample.Gathering materials through the screening of 2.36mm screen cloth after the extracting of milling material is divided into coarse aggregate and fine aggregate two portions, respectively it carried out density test then, and measured the bitumen aggregate ratio of this milling material, sees also table 3-1, table 3-2.
The extraction test result of table 3-1 asphalt
Density test table as a result gathers materials after the extracting of table 3-2RAP material
| Mineral aggregate | Volume density (g/cm 3) | Bulk density (g/cm 3) | Water-intake rate (%) |
| Coarse fodder | ??2.785 | ??2.721 | ??0.85 |
| Fines | ??2.787 | ??2.627 | ??2.18 |
The mensuration of the character index that above-mentioned extractive recovery pitch is correlated with detects the new bituminous character with label simultaneously, and its result is as table 3-3.
Table 3-3 pitch technical indicator detected result
Newly gathering materials is limestone when real estate, and the key technical indexes such as its crush values, wear(ing)value, silt content, water-intake rate detect through overtesting and all satisfy code requirement.The breeze that filler adopts limestone to wear into all satisfies the technical requirements that standard proposes.
To the milling material, newly gather materials, breeze carries out level and fits in, formate gradation composition requires to satisfy " JTG D50-2006 asphalt highway design specifications " grading limit requirement.The formate gradation composition of three kinds of mineral aggregates sees Table 3-4.To newly gather materials and the milling material heat respectively, the Heating temperature of newly gathering materials about 190～210 ℃, about 120～140 ℃ of milling material Heating temperatures.To being heated to first dry mixing 35s of newly gathering materials of assigned temperature, add the milling material again and mix and stir 65s, add load weighted new pitch afterwards and mix and stir 65s, add load weighted breeze at last, mix and stir 35s again, mix and stir temperature and be controlled at 155～165 ℃.
The grating of table 3-4SUP-20 type asphalt
Because the volume of milling material is 30%, reclaiming 25 ℃ of penetration degrees of pitch is 42 (0.1mm), sees Table 3-3, and degree of aging is not too serious, therefore can not add regenerator.1.5%～4% quality that new pitch and compound of the present invention are set than scope in, tentatively determine the volume of new pitch 1.5%, 2.0,2.5%, 3.0,3.5,4.0% 6 mass percents.Drawing 3.4% new pitch volume by the SUPERPAVE method test is that its performance index of sample under the best bitumen aggregate ratio 4.4 are best.Therefore to account for the per-cent of reclaimed asphalt mixture be that 3.4%. adopts asphalt content 4.4% shaping test piece to the new pitch in this engineering reclaimed asphalt mixture, and the asphalt content of checking 4.4% is set in N in number of machine passes
MaximumThe time correspondence bulk property index (this N
Maximum=160 times), test-results is summarized in table 3-5.
Table 3-5 design asphalt content proof test is table as a result
By above test and analysis, the asphalt characteristic of this grating correspondence such as following table 3-6.
Table 3-6 mixture volume property list
| The asphalt characteristic | Design result | The Superpave standard |
| Voidage VV (%) | ??3.97 | ??4.0 |
| Void in mineral aggregate VMA (%) | ??14.00 | ??≥13 |
| Saturation ratio VFA (%) | ??71.64 | ??65～75 |
| Ratio of filler bitumen DP (%) | ??1.46 | ??0.6～1.2 * |
| Initial number of times compactness (%) | ??84.2 | ??≤89 |
| Maximum times compactness (%) | ??97.6 | ??≤98 |
The milling material of above-mentioned grating, newly gather materials, heat regeneration asphalt mixture that breeze obtains through above-mentioned mix, through calculate newly gather materials account for total mixture quality 63.24%, new pitch accounts for 3.4%, contents of ground slag accounts for 3.36%, milling material volume is 30%, do not add regenerator.
Above-mentioned heat regeneration asphalt mixture is carried out Performance Detection
1. water stability check
Be the anti-water damage ability of check Sup20 asphalt, carried out AASHTO T283 test and immersion Marshall Test respectively according to design requirements, test-results sees Table 3-7 and table 3-8 respectively.
Table 3-7 freeze thawing split test result
Annotate:
*The per-cent of finger spare freeze thawing cleavage strength and non-condition cleavage strength.
Table 3-8 immersion Marshall stability test result
2. high-temperature stability check
According to the proportioning design requirements, carried out the checking of high temperature stability performance, test-results sees Table 3-9 respectively.
Table 3-9 wheel tracking test is summary sheet as a result
3, low-temperature stability test
Test conditions: carry out the low-temperature stability of girder pliability test with the check asphalt under-10 ℃ of conditions, test-results sees Table 3-10.
Table 3-10 low-temperature bending test
Claims (4)
1. hot in-plant reclaimed asphalt mixture, it is characterized in that comprising following mass percent composition: the ARA regenerator of contained recovery asphalt quality 0～10% in 30%～50% milling material, 44%～67% newly gather materials, 1.5%～4% breeze, 1.5%～4% new pitch and the described milling material.
2. a kind of working method of hot in-plant reclaimed asphalt mixture according to claim 1 is characterized in that comprising the steps:
1) extracting of milling material is analyzed
The sampling of milling material, extracting separates with bituminous to adopt A Busenfa or rotatory evaporator method that this sample is gathered materials, and measures the bitumen aggregate ratio of described milling material;
2) asphalt performance detects
Above-mentioned extractive recovery pitch is carried out penetration degree, ductility, softening temperature, viscometric properties index to be measured.
3) adding regenerator determines
One of following three kinds of situations need to add ARA regenerator: a, 25 ℃ of penetration degrees were less than 35 (0.1mm) during extractive recovery pitch detected, b, 60 ℃ of viscosity were greater than 1000PaS during regeneration asphalt detected, c, the volume of milling material is greater than 30%, when needing to add regenerator, according to described recovery asphaltic nature index, and above-mentioned with in reclaim the bituminous quality than scope in, preliminary definite one group of regenerant consumption, pitch is reclaimed in each consumption in this group regenerant consumption and sampling to be mixed and stirred, when mixing and stirring, adding load weighted regenerator to 140 ℃～155 ℃ reclaims in the pitch, and constantly stir 30～60min, and form one group of regeneration asphalt sample, this group regeneration asphalt sample is reached carry out property testing with the new pitch of label, according to this property testing result, determine the consumption of the regenerator of described reclaimed asphalt mixture;
4) form reclaimed asphalt mixture
To the milling material, newly gather materials, breeze carries out level and fits in, newly gather materials and the milling material heat respectively, the Heating temperature of newly gathering materials is about 190～210 ℃, about 120～140 ℃ of milling material Heating temperatures, to being heated to first dry mixing 25～35s of newly gathering materials of assigned temperature, add the milling material again and mix and stir 55～65s, add load weighted new pitch afterwards and mix and stir 55～65s, add load weighted breeze at last, mix and stir 25～35s again, add regenerator as need, load weighted regenerator is added in 140 ℃～155 ℃ new pitches in advance, and constantly stir 30～60min; Mix and stir temperature and be generally 155～165 ℃ or definite by viscosity-temperature curve according to the viscosity requirement;
5) Marshall Test or gyratory compaction test
Select certain bitumen aggregate ratio to make test specimen as examination level adapted bitumen aggregate ratio, carry out the test of Marshall Test or gyratory compaction, requiring voidage VV is 3～6%, saturation ratio VFA65～75%;
6) Performance Detection of compound
A. water stability check
The immersion Marshall stability test, residual stability MS
0〉=80%,
The freeze thawing split test, retained strength is than TSR 〉=75%;
B. thimble test
The wheel tracking test dynamic stability test, rut dynamic stability 〉=1000 time/mm;
C. low-temperature stability test
Under-10 ℃ of conditions, carry out the low-temperature stability of girder pliability test with the check asphalt.Require regenerating mixture breaking strain 〉=2500 μ ε.
3. the working method of a kind of hot in-plant reclaimed asphalt mixture according to claim 2 is characterized in that described recovery bituminous character index is respectively: penetration degree is for being 25 ℃ in temperature, 100g, and during 5s, its value is 60～80 (0.1mm); Ductility is for when temperature is 15 ℃, greater than 100cm; Softening temperature is 44～54 ℃; Viscosity is for when temperature is 60 ℃, and its value is not less than 180Pa.s.
4. the working method of a kind of hot in-plant reclaimed asphalt mixture according to claim 3 is characterized in that in-12 ℃ of low-temperature bending beam rheological tests of regeneration asphalt stiffness＜300Mpa, creep speed＞0.300m.
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