CN101654347B - Hot in-plant reclaimed asphalt mixture - Google Patents
Hot in-plant reclaimed asphalt mixture Download PDFInfo
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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 for paving 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 the newly 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 get into big or middle repairing the phase.Asphalt pavement regeneration is compared with traditional asphalt pavement maintenance mode, can practice thrift starting material such as a large amount of pitch, sandstone, saves construction investment, helps waste material treatment, protection environment simultaneously, thereby has remarkable economic efficiency and society, environmental benefit.Along with people's is to the concern of environmental protection, social benefit, and development of technology, and asphalt pavement regeneration utilization technology more and more receives people's attention.
The kind of asphalt pavement regeneration technology is more, and heat plant to mix regeneration be to use asphalt pavement regeneration method the most widely at present in the world, a large amount of research has also been done to 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 regenerated using 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 situation 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; Through the technology set and add ARA regenerator (patent No. ZL 200810122668.8) asphalt can reach or the approaching performance requriements of newly mixing asphalt through hot in-plant reclaimed back, its technical scheme is following:
Said hot in-plant reclaimed asphalt mixture, comprise following mass percent compsn: 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 said milling material.
The working method of said 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 said 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 situation 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 need adding regenerator, according to said recovery asphaltic nature index, and above-mentioned with in reclaim the bituminous quality than scope in; Preliminary definite one group of regenerant consumption reclaims pitch with each consumption in this group regenerant consumption and sampling and mixes and stirs, 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, confirm the consumption of the regenerator of said reclaimed asphalt mixture;
4) form reclaimed asphalt mixture
To the milling material, newly gather materials, breeze carries out level and fits in, and newly gathers materials and the milling material heats 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 like 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 through 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 has been up to 50% in the heat regeneration asphalt mixture practical applications of the present invention, and can be applied to middle surface layer, improves 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 superior to newly mixing asphalt.Therefore, the present invention has tangible economic benefit: can practice thrift 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 practice thrift 39894 yuan, promptly adopt 30% ratio RAP material to regenerate and to practice thrift 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 practice thrift 32308 yuan, promptly adopt 50% ratio RAP material to mix the regenerated mode and regenerate and can practice thrift 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 requirement of the 17th Session of the General Assembly the save energy resource that proposes and 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
Below in conjunction with specific examples the present invention is further specified.
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
Gather materials and bituminous extracting decomposition run at first to the sampling of milling material, and to this samples using A Busenfa.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 like 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 said 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 mixed and stirred with corresponding sampling recovery pitch respectively.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 is seen table 1-3.
Newly gathering materials is the ls 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 ls 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 is seen table 1-4, the examination graduation curve is seen Fig. 2.Heat respectively with the milling material newly gathering materials, the Heating temperature of newly gathering materials is at 190～210 ℃, 120～140 ℃ of milling material Heating temperatures.Because need to add regenerator, therefore to load weighted regenerator be added in 140 ℃～155 ℃ new pitches before compound mixes and stirs 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 through 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 practical applications situation 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 stated 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 ability of designing asphalt mixture is checked in soak Marshall Test and freeze thawing split test of grating when according to above-mentioned oilstone.Test-results is seen 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 respectively shown in table 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: under-10 ℃ of conditions, carry out the low-temperature stability of girder pliability test with the check asphalt, test-results is seen 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.
Gather materials and bituminous extracting decomposition run at first to the sampling of milling material, and to this samples using rotatory evaporator method.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 like 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 said 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 mixed and stirred with corresponding sampling recovery pitch respectively.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, consider from economy; Choose the ARA regenerator of 5% volume, the correlation technique index of its regeneration asphalt is seen table 2-2.
Newly gathering materials is the ls 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 ls 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 is seen table 2-3, and the examination graduation curve is seen Fig. 3.Heat respectively with the milling material newly gathering materials, the Heating temperature of newly gathering materials about 190～210 ℃, about 120～140 ℃ of milling material Heating temperatures.Because need to add regenerator, therefore to load weighted regenerator be added in 140 ℃～155 ℃ new pitches before compound mixes and stirs 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 Marshall Test to be tested as follows.With reference to the practical applications situation 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 ability of designing asphalt mixture is checked in soak Marshall Test and freeze thawing split test of grating when according to above-mentioned oilstone.Test-results is seen 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, the dynamic stability test result sees table 2-7.
Table 2-7 wheel tracking test
3, low-temperature stability test
Test conditions: under-10 ℃ of conditions, carry out the low-temperature stability of girder pliability test with the check asphalt, test-results is seen 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.
Gather materials and bituminous extracting decomposition run at first to milling material RAP sampling, and to this samples using rotatory evaporator method.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 like table 3-3.
Table 3-3 pitch technical indicator detected result
Newly gathering materials is the ls 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 ls 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 is seen table 3-4.Heat respectively with the milling material newly gathering materials, 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 confirm 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 through 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 corresponding 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
Through above test and analysis, asphalt characteristic such as following table 3-6 that this grating is corresponding.
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 is seen 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 is seen table 3-9 respectively.
Table 3-9 wheel tracking test is summary sheet as a result
3, low-temperature stability test
Test conditions: under-10 ℃ of conditions, carry out the low-temperature stability of girder pliability test with the check asphalt, test-results is seen table 3-10.
Table 3-10 low-temperature bending test
Claims (1)
1. the working method of a hot in-plant reclaimed asphalt mixture, it is characterized in that said hot in-plant reclaimed asphalt mixture comprise following mass percent compsn: 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 said milling material; Its processing 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 said 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 confirms
One of following three kinds of situation need interpolation ARA regenerator: 25 ℃ of penetration degrees were less than 35 (0.1mm) during a, extractive recovery pitch detected, and 60 ℃ of viscosity were greater than 1000PaS during b, regeneration asphalt detected, and the volume of c, milling material is greater than 30%; When need adding regenerator, according to said recovery asphaltic nature index, and above-mentioned with reclaim the bituminous quality than scope in; Preliminary definite one group of regenerant consumption reclaims pitch with each consumption in this group regenerant consumption and sampling and mixes and stirs, 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, confirm the consumption of the regenerator of said reclaimed asphalt mixture;
4) form reclaimed asphalt mixture
To the milling material, newly gather materials, breeze carries out level and fits in, and newly gathers 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 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 like need; Load weighted regenerator is added in 140 ℃～155 ℃ new pitches in advance, and constantly stir 30～60min; Mixing and stirring temperature is 155～165 ℃;
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, require regenerating mixture breaking strain >=2500 μ ε with the check asphalt.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN104119032A (en) * | 2014-07-03 | 2014-10-29 | 同济大学 | A regenerating method of an SBS asphalt mixture with a high RAP mixing amount |
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