CN103483836A - Modified asphalt and preparation method thereof as well as mixture containing same - Google Patents
Modified asphalt and preparation method thereof as well as mixture containing same Download PDFInfo
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- CN103483836A CN103483836A CN201310438983.2A CN201310438983A CN103483836A CN 103483836 A CN103483836 A CN 103483836A CN 201310438983 A CN201310438983 A CN 201310438983A CN 103483836 A CN103483836 A CN 103483836A
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Abstract
The invention discloses modified asphalt and a preparation method thereof as well as a mixture containing the same. The modified asphalt comprises the following raw materials in parts by weight: 100 parts of matrix asphalt, 2-10 parts of natural asphalt, 5-20 parts of plant asphalt, 2-20 parts of thermoplastic elastomers, 30-50 parts of waste tire rubber powder, 1-6 parts of waste plastics and 10-30 parts of aromatic oil. The modified asphalt is improved in high and low temperature performances.
Description
Technical field
The present invention relates to the field of bitumen technology of road engineering, relate in particular to the preparation method of a kind of full temperature range modifying asphalt, the compound that comprises this full temperature range modifying asphalt and this full temperature range modifying asphalt.
Background technology
Bituminous pavement is the form of mainly mating formation on highway in China road surface, and bituminous pavement employing bituminous material and building stones mixing by a certain percentage form.Common bituminous material has stronger temperature sensitivity, and deliquescing during high temperature easily produces pavement track, affects traffic safety; Become fragile during low temperature, easily cause pavement cracking, destroy the pavement structure performance.For this reason, the upper layer material major part of China Higher level asphalt highway has all adopted different types of modified asphalt material or asphalt modifier, for example SBS modifying asphalt, rubber asphalt, anti-rut agent etc.These modified asphalt materials or asphalt modifier are in the temperature sensitivity of having improved in varying degrees pitch, for example, SBS modifying asphalt and rubber asphalt can improve the high temperature performance of asphalt pavement material to a certain extent simultaneously, and anti-rut agent can, under the prerequisite that does not affect the asphalt pavement material low-temperature performance, increase substantially the high-temperature behavior of asphalt pavement material.
Yet, because China's most area belongs to continental climate, year temperature difference is larger, particularly the northern area year temperature difference is generally more than 50 ℃.The bituminous pavement surface extreme low temperature of some areas can reach below-30 ℃, and thermal extremes can reach more than 70 ℃.Existing modified asphalt material just has improvement in various degree to the temperature sensitivity of bituminous material, still can not meet the military service performance requriements of bituminous material in huge temperature range scope like this fully.Therefore, the problem of the high temperature performance of bituminous pavement still can not be solved fully, and the rut of China's bituminous pavement and cracking disease be ubiquity still.
Summary of the invention
The compound that the object of the present invention is to provide a kind of modifying asphalt, its preparation method and comprise this modifying asphalt.
Another object of the present invention is to provide a kind of have modifying asphalt, its preparation method of the high temperature performance of improvement and the compound that comprises this modifying asphalt.
According to an aspect of the present invention, a kind of modifying asphalt is provided, and this modifying asphalt comprises the matrix pitch of 100 weight parts, the rock asphalt of 2～10 weight parts, the plant asphalt of 5～20 weight parts, the thermoplastic elastomer of 2～20 weight parts, the waste rubber tyre powder of 30～50 weight parts, the waste or used plastics of 1～6 weight part and the aromatic hydrocarbon oil of 10～30 weight parts.
Matrix pitch can be general bi tumenf orr oad.
Rock asphalt can be at least one in lake pitch and rock asphalt.
Plant asphalt can be at least one in following material: the waste produced in the vegetables oil course of processing; The plant asphalt of bioid engineering method refining; Utilize starchiness material or maize straw, wheat straw to refine remaining waste after xylogen, vegetable protein material, through simple process, become the material after macromolecular cpd.
Thermoplastic elastomer can be at least one in styrene-butadiene-styrene, styrene-isoprene-styrene copolymer-, styrene-butadiene copolymer.
Waste or used plastics can be at least one in waste and old Low Density Polyethylene and waste and old linear low density polyethylene.
This modifying asphalt can have the softening temperature that is not less than 68 ℃ and be not less than 5 ℃ of ductilities of 100cm, or be not less than the softening temperature of 68 ℃ and be not less than-10 ℃ of ductilities of 9cm, or be not less than the softening temperature of 68 ℃ and be not less than-20 ℃ of ductilities of 3.5cm, or be not less than the softening temperature and-30 ℃ of ductilities that are not less than 5cm of 91 ℃.
According to a further aspect in the invention, a kind of method for preparing modifying asphalt is provided, and this preparation method comprises: by the aromatic hydrocarbon oil blend of waste or used plastics and 10～30 weight parts of the waste rubber tyre powder of the thermoplastic elastomer of the plant asphalt of the rock asphalt of the matrix pitch of 100 weight parts, 2～10 weight parts, 5～20 weight parts, 2～20 weight parts, 30～50 weight parts, 1～6 weight part.
Described blend can comprise: matrix pitch is heated to 130～150 ℃, rock asphalt and plant asphalt are dropped in matrix pitch and stir 30～60 minutes, obtain the first mixture; The first mixture is sent into and sheared in tank, at the temperature of 180～200 ℃, drop in the first mixture by thermoplastic elastomer and shear 30～60 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 180～200 ℃, waste rubber tyre powder and waste or used plastics are dropped in the second mixture and react 60～90 minutes, obtain the 3rd mixture; And, at the temperature of 160～180 ℃, when stirring the 3rd mixture, aromatic hydrocarbon oil is added to the 3rd mixture, add after aromatic hydrocarbon oil to continue to stir and be no less than 20 minutes.
According to another aspect of the invention, provide a kind of modified asphalt mixture, this modified asphalt mixture comprises and gathering materials and above-mentioned modifying asphalt.
The accompanying drawing explanation
By the description to embodiment below in conjunction with accompanying drawing, above and/or other side of the present invention and advantage will become clear and be easier to understand, in the accompanying drawings:
Fig. 1 is the stiffness modulus-temperatures characteristic curve of pitch or modifying asphalt.
Embodiment
Modifying asphalt according to the present invention comprises the matrix pitch of 100 weight parts, the rock asphalt of 2～10 weight parts, the plant asphalt of 5～20 weight parts, the thermoplastic elastomer of 2～20 weight parts, the waste rubber tyre powder of 30～50 weight parts, the waste or used plastics of 1～6 weight part and the aromatic hydrocarbon oil of 10～30 weight parts.
Matrix pitch can be general bi tumenf orr oad, and/or can meet China's " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) bi tumenf orr oad technical requirements.For example, matrix pitch is No. 70 or No. 90 heavy traffic paving asphalts that meet " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) bi tumenf orr oad technical requirements.
Rock asphalt can be at least one in lake pitch and rock asphalt.Rock asphalt has good high-temperature behavior, is conducive to the improvement of the high-temperature behavior of modifying asphalt in suitable content range.If the amount of rock asphalt is less than 2 weight parts, be unfavorable for the raising of the high-temperature behavior of modifying asphalt; If the amount of rock asphalt is more than 10 weight parts, modifying asphalt becomes fragile, and is unfavorable for the raising of the low-temperature performance of modifying asphalt.
In one exemplary embodiment, plant asphalt is the waste produced in the vegetables oil course of processing.The main component of the waste produced in the vegetables oil course of processing can be 60～80% lipid acid and pohytol, and its oil soluble and matrix pitch approach, mainly for the production of casting binder, Rubber Softener, bituminous composition, coating and low-volatility fuel etc.In a further exemplary embodiment, plant asphalt is the plant asphalt of bioid engineering method refining.In another exemplary embodiment, plant asphalt is to utilize starchiness material or maize straw, wheat straw etc. to refine remaining waste after the materials such as xylogen, vegetable-protein, through simple process, becomes the material after macromolecular cpd.Plant asphalt can be buied from the market, and for example it can be the plant asphalt that Shanghai branch office of Changchun Dacheng Industry Group Co.,Ltd sells.Plant asphalt can be the mixture of above-mentioned materials.
Plant asphalt is conducive to the improvement of the high temperature performance of modifying asphalt in suitable content range.If the amount of plant asphalt is less than 5 weight parts or, more than 20 weight parts, the high temperature performance of modifying asphalt can be adversely affected simultaneously.
Thermoplastic elastomer can be at least one in styrene-butadiene-styrene (SBS), styrene-isoprene-styrene copolymer-(SIS), styrene-butadiene copolymer (SB).SBS can be the SBS of linear structure, and the ratio of phenylethylene/butadiene can be 30/70, and under 230 ℃ and 2.16kg condition, melting index can be 2.0～5.0g/10min.
Thermoplastic elastomer is conducive to the improvement of the high temperature performance of modifying asphalt in suitable content range.If the amount of thermoplastic elastomer is less than 2 weight parts, do not have the effect of the high temperature performance that improves modifying asphalt; If the amount of thermoplastic elastomer more than 20 weight parts, can make the viscosity of modifying asphalt too high, affect mixing and the moulding of modified asphalt mixture.
Waste rubber tyre powder can be the rubber powder prepared by junked tire, for example, and the truck tyre rubber powder that adopts the normal temperature polishing to produce.Waste rubber tyre powder can be buied from the market.The technical indicator of waste rubber tyre powder can meet the technical requirements of " highway engineering waste rubber tyre powder rubber asphalt " (JT/T 798-2011), and its particle diameter can be 80～120 orders.
Waste rubber tyre powder is conducive to the improvement of the high temperature performance of modifying asphalt in suitable content range.If the amount of waste rubber tyre powder is less than 30 weight parts, the effect that improves the high temperature performance of modifying asphalt significantly reduces; If the amount of waste rubber tyre powder more than 50 weight parts, can make the viscosity of modifying asphalt too high, affect mixing and the moulding of modified asphalt mixture.
Waste or used plastics can be the thermoplasticity waste or used plastics, for example at least one in waste and old Low Density Polyethylene (LDPE) and waste and old linear low density polyethylene (LLDPE).The number-average molecular weight of waste and old Low Density Polyethylene (LDPE) can be 5～70,000, and the melting index under 190 ℃, 2.16kg load can be 0.2～10g/10min.The number-average molecular weight of waste and old linear low density polyethylene (LLDPE) can be 6～120,000, and the melting index under 190 ℃, 2.16kg load can be 0.2～10g/10min.
Waste or used plastics is conducive to the improvement of the high-temperature behavior of modifying asphalt in suitable content range.If the amount of waste or used plastics is less than 1 weight part, be unfavorable for the raising of the high-temperature behavior of modifying asphalt; If the amount of waste or used plastics is more than 6 weight parts, the amplitude of high-temperature behavior being improved is not obvious, and can obviously affect the low-temperature performance of modifying asphalt.
Aromatic hydrocarbon oil is conducive to the improvement of the low-temperature performance of modifying asphalt in suitable content range.If the amount of aromatic hydrocarbon oil is less than 10 weight parts, the low-temperature performance of modifying asphalt is improved to DeGrain; If the amount of aromatic hydrocarbon oil is more than 30 weight parts, the amplitude of low-temperature performance being improved is not obvious, and can obviously affect the high-temperature behavior of modifying asphalt.
Produced good synergy according to the rock asphalt in modifying asphalt of the present invention, plant asphalt, thermoplastic elastomer, waste rubber tyre powder, waste or used plastics and aromatic hydrocarbon oil due to rational proportioning between them, significantly improved the high temperature performance of material, made according to modifying asphalt of the present invention and can be applied to for example occasion of 70 ℃ to-35 ℃.For example, can there are the softening temperature that is not less than 68 ℃ and 5 ℃ of ductilities that are not less than 100cm according to modifying asphalt of the present invention, or be not less than the softening temperature of 68 ℃ and be not less than-10 ℃ of ductilities of 9cm, or be not less than the softening temperature of 68 ℃ and be not less than-20 ℃ of ductilities of 3.5cm, or be not less than the softening temperature and-30 ℃ of ductilities that are not less than 5cm of 91 ℃.Therefore, can be known as full temperature range modifying asphalt according to modifying asphalt of the present invention.
Hereinafter, the preparation method according to modifying asphalt of the present invention is described.According to the preparation method of modifying asphalt of the present invention, comprise the aromatic hydrocarbon oil blend of waste or used plastics and 10～30 weight parts of the waste rubber tyre powder of the thermoplastic elastomer of the plant asphalt of the rock asphalt of the matrix pitch of 100 weight parts, 2～10 weight parts, 5～20 weight parts, 2～20 weight parts, 30～50 weight parts, 1～6 weight part.
In one exemplary embodiment, matrix pitch is heated to 130～150 ℃, rock asphalt and plant asphalt are dropped in matrix pitch and stir 30～60 minutes, obtain the first mixture; The first mixture is sent into and for example sheared, in tank (, the high speed shear tank), at the temperature of 180～200 ℃, drop in the first mixture by thermoplastic elastomer and shear 30～60 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 180～200 ℃, waste rubber tyre powder and waste or used plastics are dropped in the second mixture and react 60～90 minutes, obtain the 3rd mixture; At the temperature of 160～180 ℃, aromatic hydrocarbon oil is added to the 3rd mixture when stirring the 3rd mixture, add after aromatic hydrocarbon oil to continue to stir and be no less than 20 minutes, thereby obtain according to modifying asphalt of the present invention.By the preparation method of this exemplary embodiment, each component of modifying asphalt is reactive blending fully, makes the synergy between each component reach best.Between each component, good synergy makes modifying asphalt according to the present invention have the high temperature performance of remarkable improvement.
Below in conjunction with example, Comparative Examples and evaluation Example to further describing according to modifying asphalt of the present invention and preparation method thereof.
The matrix pitch used in following example and Comparative Examples is No. 90 heavy traffic paving asphalts that China National Offshore Oil Corporation produces.The natural lake pitch used in following example is the natural lake pitch in Trinida (the natural lake pitch of TLA).The natural rock asphalt used in following example is the honest natural rock asphalt of cloth.The plant asphalt used in following example is the plant asphalt that Shanghai branch office of Changchun Dacheng Industry Group Co.,Ltd sells.The SBS used in following example is the 1301 type type SBSs that Yueyang petrochemical industry company limited of Ba Ling Huaxing sells.The SIS used in following example is the SIS that Yueyang petrochemical industry company limited of Ba Ling Huaxing sells.Using SB in following example is German BASF styrene-butadiene copolymer 684D.The waste rubber tyre powder used in following example is the 80 order waste rubber tyre powders that Beijing Jiage Weiye Road Construction Technology Co., Ltd. produces.The linear low density polyethylene as waste or used plastics (LLDPE) used in following example is that the melting index of raising under 7042,190 ℃ of sub-petrochemical industry BASFs, 2.16kg load is 2.0g/10min.Below example in the Low Density Polyethylene as waste or used plastics (LDPE) that uses be to raise sub-petrochemical industry BASF 2220H, the melting index under 190 ℃, 2.16kg load is 2.0g/10min.The aromatic hydrocarbon oil used in following example is the special-purpose aromatic hydrocarbon oil of asphalt modification that Dongying Man Teke petrochemical complex company limited produces.The umber of each component of using in following example is all weight parts.
example 1: modifying asphalt
100 parts of matrix pitches are heated to 140 ℃, 2 parts of natural lake pitch and 5 parts of plant asphalts are dropped in matrix pitch and stir 50 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 180 ℃, dropped in the first mixture by 2 parts of SBS and shear 58 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 190 ℃, 30 parts of waste rubber tyre powders and 1 part of LDPE are dropped in the second mixture and react 60 minutes, obtain the 3rd mixture; At the temperature of 175 ℃, when stirring the 3rd mixture, 10 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 30 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 1.
example 2: modifying asphalt
100 parts of matrix pitches are heated to 135 ℃, 6 parts of natural lake pitch and 8 parts of plant asphalts are dropped in matrix pitch and stir 45 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 185 ℃, dropped in the first mixture by 10 parts of SB and shear 30 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 195 ℃, 40 parts of waste rubber tyre powders and 3 parts of LLDPE are dropped in the second mixture and react 70 minutes, obtain the 3rd mixture; At the temperature of 162 ℃, when stirring the 3rd mixture, 9 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 60 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 2.
example 3: modifying asphalt
100 parts of matrix pitches are heated to 150 ℃, 5 parts of natural rock asphalts and 10 parts of plant asphalts are dropped in matrix pitch and stir 35 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 192 ℃, dropped in the first mixture by 8 parts of SBS and shear 35 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 180 ℃, 36 parts of waste rubber tyre powders and 5 parts of LDPE are dropped in the second mixture and react 78 minutes, obtain the 3rd mixture; At the temperature of 165 ℃, when stirring the 3rd mixture, 18 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 60 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 3.
example 4: modifying asphalt
100 parts of matrix pitches are heated to 130 ℃, 8 parts of natural lake pitch and 15 parts of plant asphalts are dropped in matrix pitch and stir 60 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 190 ℃, dropped in the first mixture by 8 parts of SIS and shear 37 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 197 ℃, 50 parts of waste rubber tyre powders and 2 parts of LLDPE are dropped in the second mixture and react 65 minutes, obtain the 3rd mixture; At the temperature of 170 ℃, when stirring the 3rd mixture, 25 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 70 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 4.
example 5: modifying asphalt
100 parts of matrix pitches are heated to 148 ℃, 10 parts of natural rock asphalts and 18 parts of plant asphalts are dropped in matrix pitch and stir 30 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 187 ℃, dropped in the first mixture by 15 parts of SIS and shear 60 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 200 ℃, 42 parts of waste rubber tyre powders and 4 parts of LDPE are dropped in the second mixture and react 82 minutes, obtain the 3rd mixture; At the temperature of 160 ℃, when stirring the 3rd mixture, 15 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 50 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 5.
example 6: modifying asphalt
100 parts of matrix pitches are heated to 142 ℃, 10 parts of natural rock asphalts and 20 parts of plant asphalts are dropped in matrix pitch and stir 32 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 196 ℃, dropped in the first mixture by 12 parts of SBS and shear 42 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 185 ℃, 32 parts of waste rubber tyre powders and 2 parts of LLDPE are dropped in the second mixture and react 67 minutes, obtain the 3rd mixture; At the temperature of 172 ℃, when stirring the 3rd mixture, 25 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 40 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 6.
example 7: modifying asphalt
100 parts of matrix pitches are heated to 145 ℃, 4 parts of natural lake pitch and 14 parts of plant asphalts are dropped in matrix pitch and stir 35 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 195 ℃, dropped in the first mixture by 18 parts of SIS and shear 47 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 187 ℃, 32 parts of waste rubber tyre powders and 6 parts of LDPE are dropped in the second mixture and react 85 minutes, obtain the 3rd mixture; At the temperature of 168 ℃, when stirring the 3rd mixture, 15 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 20 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 7.
example 8: modifying asphalt
100 parts of matrix pitches are heated to 135 ℃, 4 parts of natural lake pitch and 12 parts of plant asphalts are dropped in matrix pitch and stir 45 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 200 ℃, dropped in the first mixture by 17 parts of SBS and shear 50 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 182 ℃, 35 parts of waste rubber tyre powders and 6 parts of LLDPE are dropped in the second mixture and react 62 minutes, obtain the 3rd mixture; At the temperature of 170 ℃, when stirring the 3rd mixture, 30 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 30 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 8.
example 9: modifying asphalt
100 parts of matrix pitches are heated to 142 ℃, 4 parts of natural lake pitch and 11 parts of plant asphalts are dropped in matrix pitch and stir 42 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 182 ℃, dropped in the first mixture by 20 parts of SB and shear 55 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 192 ℃, 36 parts of waste rubber tyre powders and 1 part of LLDPE are dropped in the second mixture and react 90 minutes, obtain the 3rd mixture; At the temperature of 175 ℃, when stirring the 3rd mixture, 20 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 50 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 9.
example 10: modifying asphalt
100 parts of matrix pitches are heated to 134 ℃, 2 parts of natural lake pitch and 6 parts of plant asphalts are dropped in matrix pitch and stir 47 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 198 ℃, dropped in the first mixture by 8 parts of SBS and shear 56 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 187 ℃, 30 parts of waste rubber tyre powders and 2 parts of LDPE are dropped in the second mixture and react 80 minutes, obtain the 3rd mixture; At the temperature of 178 ℃, when stirring the 3rd mixture, 22 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 60 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 10.
example 11: modifying asphalt
100 parts of matrix pitches are heated to 146 ℃, 10 parts of natural rock asphalts and 15 parts of plant asphalts are dropped in matrix pitch and stir 55 minutes, obtain the first mixture; The first mixture is sent in the high speed shear tank, at the temperature of 186 ℃, dropped in the first mixture by 20 parts of SB and shear 52 minutes, obtain the second mixture; The second mixture is sent in the pitch retort, at the temperature of 195 ℃, 48 parts of waste rubber tyre powders and 4 parts of LLDPE are dropped in the second mixture and react 72 minutes, obtain the 3rd mixture; At the temperature of 180 ℃, when stirring the 3rd mixture, 30 parts of aromatic hydrocarbon oil are added to the 3rd mixture, continue to stir 40 minutes after adding aromatic hydrocarbon oil, thereby obtain the modifying asphalt of example 11.
example 12 is to example 22: modified asphalt mixture
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), preparation meets gathering materials of AC-13 grating intermediate value, to gather materials in mixing and stirring pot and be heated to 160 ℃～200 ℃, add respectively the modifying asphalt to example 11 according to example 1, after stirring 60s～120s, obtain modified asphalt mixture.
comparative Examples 1:90 heavy traffic paving asphalt (as matrix pitch)
comparative Examples 2:SBS modifying asphalt
The SBS modifying asphalt is the PG82-28 type SBS modifying asphalt that Beijing Daxing pitch factory of municipal administration road and bridge building materials group produces.
comparative Examples 3: rubber asphalt
Rubber asphalt is produced by Beijing Jiage Weiye Road Construction Technology Co., Ltd..
comparative Examples 4: anti-rut agent
Anti-rut agent is produced by Shanghai Qunkang Asphaltum Technology Co., Ltd..
comparative Examples 5:90 heavy traffic paving asphalt compound
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), preparation meets gathering materials of AC-13 grating intermediate value, to gather materials in mixing and stirring pot and be heated to 160 ℃～200 ℃, No. 90 heavy traffic paving asphalts that add Comparative Examples 1, after stirring 60s～120s, obtain the heavy traffic paving asphalt compound No. 90.
comparative Examples 6:SBS modified asphalt mixture
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), preparation meets gathering materials of AC-13 grating intermediate value, to gather materials in mixing and stirring pot and be heated to 160 ℃～200 ℃, the SBS modifying asphalt that adds Comparative Examples 2, after stirring 60s～120s, obtain the SBS modified asphalt mixture.
comparative Examples 7: rubber-asphalt mixture
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), preparation meets gathering materials of AC-13 grating intermediate value, will gather materials in mixing and stirring pot and be heated to 160 ℃～200 ℃, adds the rubber asphalt of Comparative Examples 3, after stirring 60s～120s, obtain rubber-asphalt mixture.
comparative Examples 8: anti-rut agent compound
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004), preparation meets gathering materials of AC-13 grating intermediate value, will gather materials in mixing and stirring pot and be heated to 160 ℃～200 ℃, adds the anti-rut agent of Comparative Examples 4, after stirring 60s～120s, obtain the anti-rut agent compound.
comparative Examples 9: wide temperature range emulsified bitumen
Adopt in CN101284920B disclosed wide temperature range emulsified bitumen 9 modifying asphalt as a comparison case.This modifying asphalt possesses high-temperature stability (softening temperature is greater than 70 ℃) and low-temperature performance (5 ℃ of ductilities are greater than 150cm) simultaneously.
comparative Examples 10: wide temperature range modifying asphalt
Adopt in CN101974235A disclosed wide temperature range modifying asphalt 10 modifying asphalt as a comparison case.This modifying asphalt possesses high-temperature stability (softening temperature is greater than 70 ℃) and low-temperature performance (5 ℃ of ductilities are greater than 150cm) simultaneously.
comparative Examples 11: wide temperature range modifying asphalt
Adopt in CN102766338A disclosed wide temperature range modifying asphalt 11 modifying asphalt as a comparison case.The softening temperature of this modifying asphalt is 78 ℃ to 102 ℃, and 5 ℃ of ductilities are 27cm-52cm.
Comparative Examples 9 to the modifying asphalt of Comparative Examples 11 has the service temperature interval wider than matrix pitch.Yet Comparative Examples 9 to the low-temperature performance test index of the modifying asphalt of Comparative Examples 11 is 5 ℃ of ductilities, and the surperficial extreme temperature on practical application medium pitch road surface is far below 5 ℃, so the low-temperature performance that 5 ℃ of ductilities fully can not evaluating material.And, bituminous material is typically to have the macromolecule polymer material that viscoelastic is moulded behavioural characteristic, if test temperature is lower than its second-order transition temperature, the mechanical behavior of material will be undergone mutation, and the good low temperature properties that material shows in 5 ℃ of ductility tests can not have good military service performance by testimonial material (as-30 ℃) under lower temperature fully.
Pitch or modifying asphalt are typically to have the macromolecule polymer material that viscoelastic is moulded behavioural characteristic, its stiffness modulus is along with temperature variation can be divided into four-stage: vitreum (linear elastomer), glass transition region．, rubber bodies (nonlinear elastic body) and viscous liquid, as shown in fig. 1.
When temperature is low, pitch or modifying asphalt are rigid solid, only very little deformation can occur under external force, and this state is vitreous state, and the material behavior interval at this is close to linear elastomer, but deflection is very little.Along with the rising of temperature, pitch or modifying asphalt start to enter glass transition region．.At glass transition region．, the modulus of material descends rapidly, and starts to occur the visco-elasticity behavioural characteristic.The temperature that material changes from the vitreum to the rubber bodies is called second-order transition temperature (T
g).Along with the continuation of temperature is risen, material modulus has entered the rubber platform interval.Relative glass transition region．, the modulus variation with temperature in rubber platform interval is very slow.When temperature reaches the fusing point of material, material converting is thick liquid.
Known according to above-mentioned analysis, due to the Service Environment of bituminous material in a lot of areas of northern China all lower than-10 ℃, therefore, the low-temperature performance and the employing-10 ℃ girder pliability test that adopt 5 ℃ of ductilities to estimate bituminous material are estimated the low-temperature performance of asphalt and are not suitable for the low-temperature performance of estimating modifying asphalt and asphalt.This be because, for pitch or this class viscoelastoplastic material of modifying asphalt, when temperature during lower than its second-order transition temperature, its modulus sharply increases, deformability sharply descends, therefore, can not predict modifying asphalt under lower temperature and the low-temperature performance of asphalt by 5 ℃ of ductility tests and-10 ℃ of girder pliability tests fully.
For identify according to example 1 to the modifying asphalt of example 11 and according to example 12 to performance and high-temperature behavior under the lower temperature of the modified asphalt mixture of example 22, measured penetration degree, softening temperature, 15 ℃ of ductilities, 5 ℃ of ductilities ,-10 ℃ of ductilities ,-20 ℃ of ductilities and-30 ℃ of ductilities to the modifying asphalt of example 11 according to example 1 in evaluation Example 1 below, and measured in evaluation Example below 2 according to example 12 to the dynamic stability of the modified asphalt mixture of example 22 ,-10 ℃ of maximum flexural-tensile strains ,-20 ℃ of maximum flexural-tensile strains and-30 ℃ of maximum flexural-tensile strains.
evaluation Example 1: the evaluation of penetration degree, softening temperature and ductility
Estimate Comparative Examples 1 matrix pitch, Comparative Examples 2 and Comparative Examples 3 modifying asphalt and according to example 1 penetration degree, softening temperature, 15 ℃ of ductilities, 5 ℃ of ductilities ,-10 ℃ of ductilities ,-20 ℃ of ductilities and-30 ℃ of ductilities to the modifying asphalt (full temperature range modifying asphalt) of example 11, shown in test method and result table 1 below.The anti-rut agent of Comparative Examples 4 is a kind of asphalt modifiers, during production, directly and aggregate blending, therefore in evaluation Example 1, does not estimate the performance of the anti-rut agent of Comparative Examples 4.
Table 1
In table 1, symbol "-" means to measure corresponding performance index according to corresponding method.
As shown in table 1, with No. 90 heavy traffic paving asphalts, SBS modifying asphalt, rubber asphalts, compare, can have according to example 1 to the modifying asphalt of example 11 softening temperature (68.1 ℃～115.5 ℃) significantly improved, this explanation modifying asphalt according to the present invention has excellent high-temperature behavior.In addition, the modifying asphalt of example 1-example 3 and example 5-example 11 has-10 ℃ of excellent ductilities, example 3, example 5, example 6 and example 8 to the modifying asphalt of example 11 has-20 ℃ of excellent ductilities, the modifying asphalt of example 3, example 5, example 6 and example 8 has excellent-30 ℃ of ductilities, especially modifying asphalts of example 6 and has-30 ℃ of ductilities up to 35.0cm.Particularly example 3, example 5, example 6 and example 8 are to the modifying asphalt of example 11, and they can have higher softening temperature and good low-temperature ductility simultaneously,, have excellent high-temperature behavior and low-temperature performance that is simultaneously.
evaluation Example 2: the evaluation of the high temperature performance of compound
After example 12 stirs 60s～120s in to example 22 and Comparative Examples 5 to Comparative Examples 8, pour respectively each compound into the Marshall die trial, hit real moulding marshal piece, test Marshall stability, residual Marshall stability and freeze thawing Ratio of split strength.In addition, example 12 is poured in the rut die trial into to roller-compaction rut plate test specimen, test dynamic stability index to example 22 and Comparative Examples 5 to the compound of Comparative Examples 8.In addition, example 12 is poured in the rut die trial to example 22 and Comparative Examples 5 to the compound of Comparative Examples 8, roller-compaction rut plate test specimen, be cut into the girder bending specimen, tests maximum flexural-tensile strain index.Shown in result table 2 below.
Table 2
In table 2,
[1]mean in " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) code requirement to the matrix pitch compound,
[2]mean during " standard specification for construction and acceptance of highway asphalt pavement " (JTGF40-2004) code requirement to modified asphalt mixture and anti-rut agent compound.Symbol "-" means to measure corresponding performance index according to corresponding method.
As shown in table 2, the every mixture performance index of Comparative Examples 5 to Comparative Examples 8 and example 12 to example 22 all meets code requirement.
As shown in table 2, example 13 is to the dynamic stability of the dynamic stability of the modified asphalt mixture of example 22 7 the compound apparently higher than Comparative Examples 5 to Comparative Examples, and this illustrated example 13 is better to the high-temperature behavior of the compound of Comparative Examples 7 than Comparative Examples 5 significantly to the high-temperature behavior of the modified asphalt mixture of example 22.In addition, example 12 is to-10 ℃ of maximum flexural-tensile strains of the modified asphalt mixture of example 22 ,-20 ℃ of maximum flexural-tensile strains and-30 ℃ of maximum flexural-tensile strain corresponding maximum flexural-tensile strains of 8 apparently higher than Comparative Examples 5 to Comparative Examples generally, and this illustrated example 12 is better to the low-temperature performance of the compound of Comparative Examples 8 than Comparative Examples 5 significantly to the low-temperature performance of the modified asphalt mixture of example 22.The modified asphalt mixture of example 14, example 16, example 17 and example 19 particularly, they can have higher dynamic stability and-30 ℃ of maximum flexural-tensile strains simultaneously,, have excellent high-temperature behavior and low-temperature performance that is simultaneously.
Therefore, modifying asphalt according to the present invention has the high temperature performance of improvement, can solve to a great extent rut and the problem of Cracking of bituminous pavement.
Although specifically illustrate and described the present invention with reference to exemplary embodiment of the present invention, it should be appreciated by those skilled in the art that without departing from the spirit and scope of the present invention, can make in form and the various changes on details.
Claims (10)
1. a modifying asphalt, is characterized in that described modifying asphalt comprises the matrix pitch of 100 weight parts, the rock asphalt of 2～10 weight parts, the plant asphalt of 5～20 weight parts, the thermoplastic elastomer of 2～20 weight parts, the waste rubber tyre powder of 30～50 weight parts, the waste or used plastics of 1～6 weight part and the aromatic hydrocarbon oil of 10～30 weight parts.
2. modifying asphalt according to claim 1, is characterized in that matrix pitch is general bi tumenf orr oad.
3. modifying asphalt according to claim 1, is characterized in that rock asphalt is at least one in lake pitch and rock asphalt.
4. modifying asphalt according to claim 1, is characterized in that plant asphalt is at least one in following material: the waste produced in the vegetables oil course of processing; The plant asphalt of bioid engineering method refining; Utilize starchiness material or maize straw, wheat straw to refine remaining waste after xylogen, vegetable protein material, through simple process, become the material after macromolecular cpd.
5. modifying asphalt according to claim 1, is characterized in that thermoplastic elastomer is at least one in styrene-butadiene-styrene, styrene-isoprene-styrene copolymer-, styrene-butadiene copolymer.
6. modifying asphalt according to claim 1, is characterized in that waste or used plastics is at least one in waste and old Low Density Polyethylene and waste and old linear low density polyethylene.
7. modifying asphalt according to claim 1, it is characterized in that described modifying asphalt has the softening temperature that is not less than 68 ℃ and 5 ℃ of ductilities that are not less than 100cm, or be not less than the softening temperature of 68 ℃ and be not less than-10 ℃ of ductilities of 9cm, or be not less than the softening temperature of 68 ℃ and be not less than-20 ℃ of ductilities of 3.5cm, or be not less than the softening temperature and-30 ℃ of ductilities that are not less than 5cm of 91 ℃.
8. a method for preparing modifying asphalt is characterized in that described method comprises:
Aromatic hydrocarbon oil blend by waste or used plastics and 10～30 weight parts of the waste rubber tyre powder of the thermoplastic elastomer of the plant asphalt of the rock asphalt of the matrix pitch of 100 weight parts, 2～10 weight parts, 5～20 weight parts, 2～20 weight parts, 30～50 weight parts, 1～6 weight part.
9. method according to claim 8 is characterized in that described blend comprises:
Matrix pitch is heated to 130～150 ℃, rock asphalt and plant asphalt are dropped in matrix pitch and stir 30～60 minutes, obtain the first mixture;
The first mixture is sent into and sheared in tank, at the temperature of 180～200 ℃, drop in the first mixture by thermoplastic elastomer and shear 30～60 minutes, obtain the second mixture;
The second mixture is sent in the pitch retort, at the temperature of 180～200 ℃, waste rubber tyre powder and waste or used plastics are dropped in the second mixture and react 60～90 minutes, obtain the 3rd mixture; And
At the temperature of 160～180 ℃, aromatic hydrocarbon oil is added to the 3rd mixture when stirring the 3rd mixture, add after aromatic hydrocarbon oil to continue to stir and be no less than 20 minutes.
10. a modified asphalt mixture, is characterized in that comprising and gather materials and according to the described modifying asphalt of any one in claim 1 to 7.
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| CN104403336A (en) * | 2014-11-29 | 2015-03-11 | 乌鲁木齐市城市综合交通项目研究中心 | Plant asphalt-based universal road surface reclaiming agent and preparation method thereof |
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| CN104987734A (en) * | 2015-07-06 | 2015-10-21 | 交通运输部公路科学研究所 | High fracture toughness and elasticity modified asphalt, preparing method and application thereof |
| CN104945919A (en) * | 2015-07-24 | 2015-09-30 | 湖北国创高新材料股份有限公司 | Pouring asphalt binder and preparation method thereof |
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| CN106189290A (en) * | 2016-07-12 | 2016-12-07 | 同济大学 | Modified asphalt material, its preparation method and application for airport pavement |
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| CN108285770A (en) * | 2018-02-13 | 2018-07-17 | 西咸新区众力沥青有限公司 | A kind of normal temperature type bitumen polymeric seal glue and preparation method thereof |
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