CN103613940A - Rock asphalt composite modifier as well as preparation method and application thereof - Google Patents
Rock asphalt composite modifier as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a rock asphalt composite modifier as well as a preparation method and application thereof. The rock asphalt composite modifier is compounded from 10-90% of rock asphalt and 10-90% of an admixture, and can improve the high-low temperature performance of asphalt and reduce the temperature sensibility of the asphalt when being added into matrix asphalt. The rock asphalt composite modifier disclosed by the invention can be used for preparing a composite modified asphalt mixture and can make up the defects including poor storage stability, high price and high compatibility requirement for the matrix asphalt of intra-industry ordinary SBS (styrene-butadiene-styrene) modified asphalt at present; the rock asphalt composite modifier can reduce the mixing temperature of the asphalt mixture, improve the adhesion to stones and then delay the time of problems including pavement ruts, displacement, embracement, cracks, loose falling and the like, so that the service life of a road is prolonged. The rock asphalt composite modifier disclosed by the invention not only achieves an effect of modifying the performance of asphalt but also can reduce the asphalt dosage of the asphalt mixture, so that road mechanical properties of a pavement are improved, the construction cost is saved, and very good social and economic benefits are achieved.
Description
Technical field
The present invention relates to the properties-correcting agent and preparation method thereof and application, rock asphalt composite modifier being specifically composited by rock asphalt and one or more additives and preparation method thereof and application in pavement construction material field.
Background technology
Rock asphalt is constantly from the earth's crust, to emerge and be present in massif, rock fracture due to oil, the rock asphalt forming through long-term evaporation coagulation.Natural rock asphalt has high nitrogen content (general pitch in seldom nitrogenous), so asphalt viscosity is large, and oxidation-resistance is strong, particularly has good adhesivity and stripper-resistance with gathering materials.Chemical structure and pitch approach, thus very good with the consistency of pitch, be easily combined with polymkeric substance, there is good anti-water damage and oxidation-resistance; Compare with pitch molecular-weight average 3000, the molecular weight of natural rock asphalt is up to 9000, therefore high temperature viscosity is also large, makes the asphalt viscosity after modification better.
For improving the properties-correcting agent of asphalt performance, mainly contain two large classes: polymer class and rock asphalt class.At present, domestic normal what use is polymer class modifying asphalt, is roughly divided three classes: resene, rubber-like and thermoplastic elastomer.In general, through the pitch softening point rising of resene polymer modification, ductility reduces, and high-temperature behavior strengthens; After rubber polymer modification, bitumen ductility increases, and low-temperature performance improves; Thermoplastic elastic material has good high temperature performance simultaneously, enjoys road worker's welcome, wherein with SBS, applies the most extensively again.However, nearly all polymer modified asphalt is all faced with a common mortality defect: poor with matrix pitch consistency, 5 joining property, and easy segregation.The price of polymer modified asphalt is also relatively high in addition, and these factors have hindered the further application and development of polymer modified asphalt.
Natural rock asphalt is a kind of as pitch, has that consistency is good, stable in properties, the advantage such as cheap with bi tumenf orr oad, for asphalt modification, to improve the high-temperature stability of asphalt, has obtained a large amount of research and extension.
Use separately rock asphalt to carry out modification to petroleum pitch, by on its compound making and road surface, can improve to a certain extent on the one hand high-temperature behavior, anti-water damage property and the anti-fatigue performance on road surface, but modified effect is very limited, low-temperature performance allows of no optimist on the other hand, and the more multipair low-temperature performance of volume is destroyed larger.
Summary of the invention
First object of the present invention is to provide a kind of rock asphalt composite modifier, second object of the present invention is to provide the preparation method of above-mentioned rock asphalt composite modifier, the 3rd object of the present invention is to provide application-mixing composite modified asphalt mixture of above-mentioned rock asphalt composite modifier, by compound making in each layer of position on road surfaces at different levels, improve the high temperature stability on road surface, anti-water damage ability, temperature sensibility, weather resistance, fatigue resistance, reduce pavement track, pass, embrace, crack, the loose disease such as come off, simultaneously than other conventional properties-correcting agent, rock asphalt reasonable price, can reduce engineering cost.
Realizing technical scheme of the present invention is:
A rock asphalt composite modifier, is comprised of the rock asphalt of 10%-90% and the additive of 10%-90%, and per-cent is the ratio that accounts for rock asphalt composite modifier gross weight.
In the present invention, described rock asphalt is natural solid, and its asphalt content is between 20%-30%, and softening temperature is greater than 80 ℃, and nitrogen content is high, not the content of wax.
In the present invention, described additive comprises at least one composition that is selected from rubber, resin, thermoplastic elastomer, elastomerics, plastomer and combination thereof.
In the present invention, described additive comprises at least one composition that is selected from styrene-butadiene-styrene block copolymer (SBS), styrene isoprene styrene block copolymer (SIS) (SIS), Afpol (SBR), chloroprene rubber (CR), ethylene-propylene rubber(EPR) (EPDM), chlorinatedpolyethylene (CPE), rubber powder, sulphur, carbon black and combination thereof.
In the present invention, described rubber powder derives from, but is not limited to, junked tire, and its particle diameter is 80 order-200 orders.
A preparation method for rock asphalt composite modifier, comprises the following steps: rock asphalt is carried out to granulation, be then mixed in proportion and mix thoroughly with additive, obtain rock asphalt composite modifier.
A preparation method for rock asphalt composite modifier, comprises the following steps: first, by rock asphalt and additive blend, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
An application for rock asphalt composite modifier, comprises the following steps (wet method):
(1) matrix pitch is heated to 140 ℃-180 ℃, adds load weighted rock asphalt composite modifier in proportion, mix 40-100min, after the abundant swelling of thing to be mixed, obtains composite modified asphalt;
(2) will gather materials and be heated to 145 ℃-210 ℃, and spray into composite modified asphalt and the breeze of step (1), mix 30s-70s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture.
The proportioning of above-mentioned steps (1) mesostroma pitch and rock asphalt composite modifier is determined according to actual needs.
An application for rock asphalt composite modifier, concrete steps following (wet method):
(1) additive is added in matrix pitch, tentatively obtain pre-modifying asphalt, making method is with reference to the preparation of common modifying asphalt;
(2) the preliminary modifying asphalt in step (1) is heated to 140 ℃-180 ℃, adds the rock asphalt particle measuring, stir 30min-90min, after rock asphalt particle dissolves completely, obtain composite modified asphalt;
(3) will gather materials and be heated to 145 ℃-210 ℃, and spray into composite modified asphalt and the breeze of step (1), mix 30s-70s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture.
Pre-modifying asphalt in above-mentioned steps (1) can directly obtain or prepare voluntarily with reference to common modified asphalt manufacturing method from asphalt production producer, and concrete proportioning is determined according to actual needs.
A rock asphalt composite modified asphalt mixture, concrete steps following (dry method):
(1) with reference to common modifying asphalt method, additive is added in matrix pitch, obtain pre-modifying asphalt;
(2) will gather materials and be heated to 145 ℃-210 ℃, and drop into load weighted rock asphalt in proportion, dry mixing 15s-30s, sprays into pre-modifying asphalt and the breeze of step (1), and mix 30s-60s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture.
Above-mentioned mixed ratio example is specifically determined according to actual needs.
A kind of application of rock asphalt composite modifier, concrete steps following (dry method): will gather materials and be heated to 145 ℃-210 ℃, drop into load weighted rock asphalt composite modifier in proportion, mix 15s-30s, spray into matrix pitch and breeze, mix 30s-60s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture.
The proportioning of above-mentioned matrix pitch and rock asphalt composite modifier is determined according to actual needs.
The present invention is with respect to advantage and the effect of prior art:
(1) current, domestic conventional properties-correcting agent is very high to the specification of quality of matrix pitch, and road asphalt is difficult to meet the demands mostly, and this has just increased the dependency to external high-quality asphaltic products..On the other hand, structurally there is very big-difference in these properties-correcting agent and matrix pitch, the problem that modifying asphalt ubiquity is easily emanated, storage stability is poor being mixed to get.Rock asphalt composite modifier in the present invention and matrix pitch consistency are better, and so strict to the latter Wu Peixing requirement, common road asphalt can be competent at, and is conducive to promote application and the development of road asphalt.
(2) than common non-modified asphalt mixture and apply separately rock asphalt, polymkeric substance or mineral modified asphalt, the present invention is compound by rock asphalt and one or more additives, can give full play to rock asphalt and additive performance advantage separately, form performance complement, the pavement performances such as road surface high-temperature stability after composite modifier modification, low-temperature cracking-resistance, normal temperature fatigue resistance, anti-water damage, weather resistance are all farthest improved.
(3) at present domestic conventional Modified Bitumen Production Procedure is complicated, and production unit is expensive, and the price of pitch remains higher level.Rock asphalt composite modifier of the present invention is modifying asphalt preferably not only, and preparation technology is simple, easy to operate, saves cost.For common modifying asphalt, for preventing that it from segregation occurring and need constantly it to be carried out to heat stirring; For conventional hot-mix asphalt mixture, higher mix temperature is its principal character, and these factors have increased fuel consumption cost undoubtedly.Follow the increase of fuel cost, the discharge of thermal ageing reaction, toxic gas and the waste gas of pitch is also all synchronously being carried out, and the result is just the contrary.When rock asphalt composite modifier of the present invention is applied to laying of roadway, the more common hot-laid mixture of mix temperature reduces by tens degree, not only save energy consumption, save accumulating expense, alleviate ageing of asphalt level, reduce the discharge of toxic gas, greenhouse gases simultaneously, at utmost reduce the harm to human and environment, so the present invention has had good social benefit, economic benefit and environmental benefit.
(4) rock asphalt composite modifier in the present invention and petroleum pitch have good consistency, have good cohesiveness with gathering materials, and have good high-temperature stability, water stability, weather resistance and fatigue resistance.Apply it in pitch and asphalt, strengthened on the one hand the structural strength of pitch, realize the modification to pitch, the part pitch on the other hand can replacing asphalt compound, reduces asphalt content.From initial stage, technical scheme of the present invention has been saved pitch cost; In the long term, because the road surface of its making has good pavement performance, to the foster dimension workload of operation stage in later stage, support dimension expense and all will greatly reduce, therefore, the economic benefits that the present invention produces are huge.
(5) in the application aspect of properties-correcting agent, dry method and wet method have relative merits separately and the scope of application separately, Given this, the invention provides rock asphalt composite modifier for two kinds of method-dry method and the wet method of mixing compound, under different situations, use.
Embodiment
below by embodiment, further illustrate the present invention.
Embodiment 1: a kind of rock asphalt composite modifier, the rock asphalt by 20% and 80% rubber powder form.Concrete implementation step is as follows:
First by rock asphalt and rubber powder blend, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 2: a kind of rock asphalt composite modifier, the rock asphalt by 30% and 70% carbon black form.Concrete implementation step is as follows:
First rock asphalt is broken into particle by pulverizer, is then mixed in proportion and mixes thoroughly with carbon black, and granulation, rock asphalt composite modifier obtained.
Embodiment 3: a kind of rock asphalt composite modifier, the rock asphalt by 50% and 50% sulphur form.Concrete implementation step is as follows:
First rock asphalt is broken into particle by pulverizer, is then mixed in proportion and mixes thoroughly with sulphur, and granulation, rock asphalt composite modifier obtained.
Embodiment 4: a kind of rock asphalt composite modifier, the rock asphalt by 40% and 60% chloroprene rubber (CR) form.Concrete implementation step is as follows:
First by rock asphalt and chloroprene rubber (CR) blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 5: a kind of rock asphalt composite modifier, the rock asphalt by 45% and 55% ethylene-propylene rubber(EPR) (EPDM) form.Concrete implementation step is as follows:
First by rock asphalt and ethylene-propylene rubber(EPR) (EPDM) blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 6: a kind of rock asphalt composite modifier, the rock asphalt by 60% and 40% chlorinatedpolyethylene (CPE) form.Concrete implementation step is as follows:
First by rock asphalt and chlorinatedpolyethylene (CPE) blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 7: a kind of rock asphalt composite modifier, the rock asphalt by 70% and 30% Afpol (SBR) form.Concrete implementation step is as follows:
First by rock asphalt and Afpol (SBR) blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 8: a kind of rock asphalt composite modifier, the rock asphalt by 80% and 20% styrene isoprene styrene block copolymer (SIS) (SIS) form.Concrete implementation step is as follows:
First by rock asphalt and styrene isoprene styrene block copolymer (SIS) (SIS) blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 9: a kind of rock asphalt composite modifier, the rock asphalt by 65%, 5% styrene-butadiene-styrene block copolymer (SBS) and 30% sulphur form.Concrete implementation step is as follows:
First by rock asphalt and styrene-butadiene-styrene block copolymer (SBS), sulphur blend in proportion, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
Embodiment 10: by the rock asphalt composite modifier of embodiment 3, for the preparation of rock asphalt composite modified asphalt mixture, concrete implementation step is as follows:
(1) matrix pitch is heated to 150 ℃, adds load weighted rock asphalt composite modifier, mix 40min, after the abundant swelling of thing to be mixed, obtains composite modified asphalt;
(2) will gather materials and be heated to 170 ℃, and spray into composite modified asphalt and the breeze of step (1), at the temperature of 135 ℃, mix 30s, obtains composite modified asphalt mixture.
The proportioning of step (1) mesostroma pitch and rock asphalt composite modifier is determined according to specific needs.
Table 1 is rock asphalt composite modified asphalt mixture rut dynamic stability test result, be not difficult to find, asphalt after rock asphalt composite modifier modification, its dynamic stability is much larger than matrix pitch compound, be easy to reach 2800, and with the increase of content of modifier, rut dynamic stability is also improving constantly.
The composite modified warm mix compound of table 1 rock asphalt rut dynamic stability test result
| Rock asphalt composite modifier and matrix pitch mass ratio (%) | Dynamic stability DS (inferior/mm) |
| 0 | 1431 |
| 30 | 3373 |
| 40 | 3894 |
Embodiment 11: a kind of rock asphalt composite modified asphalt mixture, and concrete implementation step is as follows:
(1) with reference to common modifying asphalt method, ethylene-propylene rubber(EPR) (EPDM) is added in matrix pitch, obtain pre-modifying asphalt;
(2) pre-modifying asphalt is heated to 140 ℃, adds the rock asphalt particle measuring, stir 60min, after rock asphalt particle dissolves completely, obtain composite modified asphalt;
(3) will gather materials and be heated to 150 ℃, and spray into composite modified asphalt and the breeze of step (1), mix 35s, obtains composite modified asphalt mixture.
Above-mentioned mixed ratio example is specifically determined according to actual needs.
Embodiment 12: a kind of rock asphalt composite modified asphalt mixture, and concrete implementation step is as follows:
(1) with reference to common modifying asphalt method, sulphur is added in matrix pitch, obtain pre-modifying asphalt;
(2) will gather materials and be heated to 160 ℃, and drop into load weighted rock asphalt in proportion, dry mixing 20s, sprays into pre-modifying asphalt and the breeze of step (1), and at the temperature of 135 ℃, mix 30s, obtains composite modified asphalt mixture.
Above-mentioned mixed ratio example is specifically determined according to actual needs.
Meanwhile, adopt rock asphalt, sulphur respectively matrix pitch to be carried out to modification, complete the Performance Detection to processes of rock asphalt modified asphalt and compound, sulfur modified pitch and compound thereof, the detected result of itself and rock asphalt composite modified asphalt and compound thereof is compared.
The proportioning of above-mentioned matrix pitch and rock asphalt composite modifier is determined according to specific needs.
Table 2 is for to carry out to processes of rock asphalt modified asphalt, sulfur modified pitch, rock asphalt composite modified asphalt the rut factor that dynamic shear rheological test (DSR) obtains.Table 3 is for to carry out to processes of rock asphalt modified asphalt compound, modified asphalt mixture by SEAM, rock asphalt composite modified asphalt mixture the rut degree of depth and the dynamic stability that wheel tracking test (60 ℃) obtains.Table 4 for to carry out to processes of rock asphalt modified asphalt compound, modified asphalt mixture by SEAM, rock asphalt composite modified asphalt mixture the rut degree of depth and the dynamic stability that wheel tracking test obtains under differing temps.
The table 2 rock asphalt composite modified asphalt DSR test rut factor
| 64 ℃ of rut factors | Rock asphalt composite modifier volume (%) | 64 ℃ of rut factors |
| 1.215 | 0 | 1.215 |
| 3.121 | 20 | 5.548 |
| 3.889 | 30 | 6.908 |
| 5.012 | 40 | 9.087 |
| 6.525 | 50 | 12.04 |
60 ℃ of wheel tracking test results of the composite modified warm mix compound of rock asphalt asphalt under table 3 different addition quantity
| Rock asphalt composite modifier volume (%) | The rut degree of depth (mm) | Dynamic stability DS (inferior/mm) |
| 0 | 2.132 | 4327 |
| 30 | 1.679 | 5945 |
| 40 | 1.909 | 6228 |
The composite modified warm mix compound of rock asphalt wheel tracking test result under table 4 differing temps
From table 2, table 3, be not difficult to find, the rut factor of the pitch of admixture rock asphalt composite modifier improves greatly, and its compound also has the less rut degree of depth and the dynamic stability of Geng Gao.According to table 4, along with temperature raises, the dynamic stability of rock asphalt composite modified asphalt mixture reduces gradually, even if but still keep 3000 times/more than mm high dynamic stability in the time of 75 ℃.As can be seen here, remarkable through pitch and the stability at high temperature of asphalt mixture of rock asphalt composite modifier modification, there is good high temperature stability.
Embodiment 13: will implement 2 rock asphalt composite modifier for the preparation of rock asphalt composite modified asphalt mixture, concrete implementation step is as follows: will gather materials and be heated to 155 ℃, drop into load weighted rock asphalt composite modifier in proportion, mix 15s, spray into matrix pitch and breeze, at the temperature of 140 ℃, mix 30s, obtains composite modified asphalt mixture.
The proportioning of above-mentioned matrix pitch and rock asphalt composite modifier is determined according to specific needs.
Claims (11)
1. a rock asphalt composite modifier, is characterized in that it is comprised of rock asphalt and additive, and the mass percent of rock asphalt and additive is 10%-90%:90%-10%.
2. rock asphalt composite modifier according to claim 1, is characterized in that described rock asphalt is natural solid, and its asphalt content is between 20%-40%, and softening temperature is greater than 80 ℃, and nitrogen content is high, not the content of wax.
3. rock asphalt composite modifier according to claim 1, is characterized in that described additive comprises to be selected from rubber, resin, thermoplastic elastomer, elastomerics or plastomer more than one.
4. rock asphalt composite modifier according to claim 1, is characterized in that described additive comprises to be selected from styrene-butadiene-styrene block copolymer, styrene isoprene styrene block copolymer (SIS), Afpol, chloroprene rubber, ethylene-propylene rubber(EPR), chlorinatedpolyethylene, rubber powder, sulphur, carbon black or fiber more than one.
5. rock asphalt composite modifier according to claim 4, is characterized in that described rubber powder derives from, but is not limited to, junked tire, and its particle diameter is 80 order-200 orders.
6. a preparation method for rock asphalt composite modifier as claimed in claim 1, is characterized in that: first rock asphalt is broken into particle by pulverizer, is then mixed in proportion and mixes thoroughly with additive, and granulation, obtain rock asphalt composite modifier.
7. a preparation method for rock asphalt composite modifier as claimed in claim 1, is characterized in that: first, by rock asphalt and additive blend, then mixture is carried out to granulation, obtain rock asphalt composite modifier.
8. an application for rock asphalt composite modifier as claimed in claim 1, is characterized in that adopting wet method, and concrete steps are as follows:
(1) matrix pitch is heated to 140 ℃-180 ℃, adds load weighted rock asphalt composite modifier in proportion, mix 40min-100min, after the abundant swelling of thing to be mixed, obtains composite modified asphalt;
(2) will gather materials and be heated to 145 ℃-210 ℃, and spray into composite modified asphalt and the breeze of step (1), mix 30s-70s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture;
The proportioning of above-mentioned steps (1) mesostroma pitch and rock asphalt composite modifier is determined according to actual needs.
9. an application for rock asphalt composite modifier as claimed in claim 1, is characterized in that adopting wet method, and concrete steps are as follows:
(1) additive is added in matrix pitch, tentatively obtain pre-modifying asphalt, making method is with reference to the preparation of common modifying asphalt;
(2) the pre-modifying asphalt in step (1) is heated to 140 ℃-180 ℃, adds the rock asphalt particle measuring, stir 30-90min, after rock asphalt particle dissolves completely, obtain composite modified asphalt;
(3) will gather materials and be heated to 145 ℃-210 ℃, and spray into composite modified asphalt and the breeze of step (1), mix 30s-70s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture;
Pre-modifying asphalt in above-mentioned steps (1) directly obtains or prepares voluntarily with reference to common modified asphalt manufacturing method from asphalt production producer.
10. an application for rock asphalt composite modifier as claimed in claim 1, is characterized in that adopting dry method, and concrete steps are as follows:
(1) with reference to common modifying asphalt method, additive is added in matrix pitch, obtain pre-modifying asphalt;
(2) will gather materials and be heated to 145 ℃-210 ℃, and drop into load weighted rock asphalt in proportion, dry mixing 15s-30s, sprays into pre-modifying asphalt and the breeze of step (1), and mix 30s-60s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture;
Above-mentioned mixed ratio example is specifically determined according to actual needs.
The application of 11. 1 kinds of rock asphalt composite modifiers as claimed in claim 1, it is characterized in that adopting dry method, concrete steps are as follows: will gather materials and be heated to 145 ℃-210 ℃, drop into load weighted rock asphalt composite modifier in proportion, mix 15s-30s, spray into matrix pitch and breeze, mix 30s-60s at the temperature of 135 ℃-190 ℃, obtains composite modified asphalt mixture;
The proportioning of above-mentioned matrix pitch and rock asphalt composite modifier is determined according to actual needs.
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