CN105254221A - Composite type warm mix asphalt mixture, preparation method and application thereof - Google Patents
Composite type warm mix asphalt mixture, preparation method and application thereof Download PDFInfo
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Abstract
Belonging to the field of engineering technologies, the invention relates to a warm mix asphalt mixture, a preparation method and application thereof, in particular to a composite type warm mix asphalt mixture, a preparation method and application thereof. The composite type warm mix asphalt mixture is composed of the following components by weight: 0.4%-0.6% of a composite warm mix modifier, 4-6% of SBS modified asphalt, 80-90% of aggregate, and 8-12% of limestone mineral powder. According to the invention, by adding the composite warm mix modifier into the asphalt mixture, the asphalt viscosity is lowered and asphalt properties are improved, and the mixing temperature of the asphalt mixture is lowered. The composite type warm mix asphalt mixture can lower the mixing and construction temperature, achieve the asphalt mixture warm mix effect, and can save resources and reduce carbon emissions. At the same time, by adopting the composite type warm mix asphalt mixture, the pavement performance of the asphalt mixture can be effectively improved.
Description
Technical field
The present invention relates to a kind of Warm-Mix Bitumen Mixture and its preparation method and application, particularly relate to a kind of compound Warm-Mix Bitumen Mixture and its preparation method and application, belong to field of engineering technology.
Background technology
Global energy shortage and climate change have become the significant problem of international community's common concern, and energy-saving and emission-reduction have become the corporation responsibility of international community.China, as developing country maximum in the world, becomes the object of global concern just day by day.Transportation industry is AND ENERGY RESOURCES CONSUMPTION IN CHINA rich and influential family, is the key areas of building a resource-conserving and environment-friendly society, and is the important sources of greenhouse gases and air pollution emission.It is estimated, the CO2 emissions of China Transportation Industry in 2015 is about 500,000,000 tons, expects the year two thousand thirty will to reach 1,200,000,000 tons respectively.Therefore the carbon emission how controlling traffic transport industry becomes the most important thing.Have data to show, in Process of Pitch Mixture Production, temperature often raises 10 DEG C, and asphalt per ton is by the CO of raw for fecund 0.9kg
2quantity discharged.If asphalt mix and stir temperature reduction 30 DEG C, the CO of asphalt
2discharge capacity will cut down 13%, and the production temperature of Warm-Mix Bitumen Mixture hot-mix asphalt mixture relative to construction temperature can lower 20-40 DEG C, have the effect reducing carbon emission, fuel economy, protection of the environment.
At present, asphalt mixture warm-mixing technology is mainly divided into four kinds: soft or hard pitch harmonic method, pitch-mineral method, surfactivity warm mix technology and organic additive warm mix technology.The realizing of China's Warm-Mix Bitumen Mixture more than 90% adopts warm mix properties-correcting agent to be all organic interpolation and surfactant-based, what surfactivity warm mix technology adopted is adding liquid warm-mixing agent, what organic additive warm mix technology adopted is add organic solid warm-mixing agent, these two kinds of Warm-Mix Bitumen Mixture all have good warm mix effect, realize energy-saving and emission-reduction, but there is reduction in various degree in the pavement performance of the Warm-Mix Bitumen Mixture of mixing and stirring out, its road is with lower slightly compared with hot-mix asphalt mixture pavement performance.
Summary of the invention
The technical problem to be solved in the present invention is: the defect existed for prior art, solves the difficult problem because warm mix properties-correcting agent causes Asphalt Mixture Performance to reduce.Propose a kind of compound Warm-Mix Bitumen Mixture and its preparation method and application, adopt compound warm mix technology to reach the object of warm mix, energy-saving and emission-reduction and raising Warm-Mix Bitumen Mixture pavement performance.
Object of the present invention is achieved through the following technical solutions: a kind of compound Warm-Mix Bitumen Mixture, is made up of the component of following weight percent:
Compound warm mix properties-correcting agent in said components by weight percentage, by the wood fibre of 50%, the zeolite of 40% and 10% saturated hydrocarbon form; Described gathering materials is divided into following third gear: 0-4.75mm, 4.75-9.5mm, 4.75-16mm, and the ratio of each shelves is: 10-18%:23-33%:43-53%; The particle diameter of described limestone mineral powder is 0.6mm, and the percent of pass of sieve aperture is that the percent of pass that the percent of pass of 100%, 0.15mm sieve aperture is greater than 90%, 0.075mm is greater than 75%.
The present invention further provides the preparation method of compound Warm-Mix Bitumen Mixture, comprise the following steps:
Step one, by described gather materials be heated to 160 ± 5 DEG C after, add limestone mineral powder in described ratio, stir 10 ~ 15s;
Step 2, continuation add the compound warm mix properties-correcting agent of described ratio, without the need to mixing and stirring;
Step 3, described SBS modifying asphalt is heated to 170 ± 5 DEG C after, add in the mixture of step 2, stir 80 ~ 100s, whipping temp is 160 ± 5 DEG C, obtains compound Warm-Mix Bitumen Mixture.
In the described step 3 of aforesaid method, after adding SBS modifying asphalt, for making pitch and warm-mixing agent reaction more fully, better produce pitch bubble, therefore the wet-mixing time after spraying into pitch is 80-100s.Facts have proved the best results of wet-mixing 90s.
Compound asphalt of mixing is a kind of novel Warm-Mix Bitumen Mixture, compound warm mix properties-correcting agent is added in asphalt, produce pitch bubble thus reduce asphalt viscosity, improve the workability of compound, fully can wrap at a lower temperature and gather materials, that reduces asphalt mixes and stirs temperature, in addition, the splash that the shattered to pieces process of asphalt foam has one to be similar to bubble and to vanish, is conducive to fully wrapping up in of gathering materials attached.Effectively can improve the pavement performance of compound in warm mix properties-correcting agent of the present invention containing Mierocrystalline cellulose simultaneously.
The warm mix principle of compound Warm-Mix Bitumen Mixture of the present invention is after the zeolite input pitch inside compound warm mix properties-correcting agent, Bound moisture at high temperature in zeolite becomes water vapour, volumetric expansion in the process of gasification, generation pitch steeps, about 5 ~ 6 minutes of the whole process lasts that a large amount of pitch bubble produces.Each pitch bubble is from generation to disappearance needs about 7 seconds, largest diameter about 3 centimetres, pitch becomes and is wrapped in the asphalt membrane that outside water vapour, one deck is very thin, increases surface-area, and pitch bubble reduces than asphalt viscosity, workability increases, fully can wrap at a lower temperature and gather materials, that reduces asphalt mixes and stirs temperature, in addition, the splash that the shattered to pieces process of asphalt foam has one to be similar to bubble and to vanish, is conducive to fully wrapping up in of gathering materials attached.Meanwhile, during lipoid substance high temperature and biochemical reaction of Asphalt Production reduce asphalt viscosity and improve asphalt performance, that reduces asphalt mixes and stirs temperature, and therefore, compound warm mix properties-correcting agent is by physical foam and chemical reaction acting in conjunction test warm mix effect.
The invention has the beneficial effects as follows: use compound Warm-Mix Bitumen Mixture, can reduce mix and stir, construction temperature, reach asphalt mixture warm-mixing effect, fuel oil consumption can have been saved again, reduce Process of Pitch Mixture Production percent of greenhouse gases and noxious gas emission; When adopting compound Warm-Mix Bitumen Mixture, under the effect realizing warm mix simultaneously, effectively can also improve and improve the pavement performance of asphalt.There is very large social benefit and the value of environmental protection.
Accompanying drawing explanation
Fig. 1 is the high-temperature behavior Experimental Comparison figure of various embodiments of the present invention.
Fig. 2 is various embodiments of the present invention crack resistance at low-temperature Experimental Comparison figure.
Fig. 3 is various embodiments of the present invention immersion Marshall test comparison diagram.
Fig. 4 is various embodiments of the present invention indirect tensile test on frozen-thaw comparison diagram.
Fig. 5 is various embodiments of the present invention anti-fatigue performance Experimental Comparison figure.
Embodiment
Compound Warm-Mix Bitumen Mixture in the present invention, make pitch produce pitch bubble by compound warm mix properties-correcting agent, reduce asphalt viscosity, increase its workability, not only reach the object of cooling, reduce the consumption of the energy and the discharge of greenhouse gases, the pavement performance of asphalt can be improved simultaneously.Technical scheme of the present invention is further illustrated by following examples.
Embodiment one
1. material prepares:
Warm mix properties-correcting agent, adopts compound warm mix properties-correcting agent.Compound warm mix properties-correcting agent is made up of 50% wood fibre, 40% zeolite and 10% saturated hydrocarbon.
Pitch, adopts SBS modifying asphalt.
Gravel aggregate, also known as aggregate.One of main composition material of bituminous concrete, mainly plays skeleton function and reduces due to the volume change of gelling material in setting and harden process caused by expand with wet and contract with dry, simultaneously also as the cheap stopping composition of gelling material.Have natural aggregate and artificial aggregate point, the former is as rubble, cobble, float stone, natural sand etc.; The latter is as cinder, slag, haydite, pearlstone etc.The gravel aggregate that the present embodiment adopts is divided into following third gear: 0 ~ 4.75mm, 4.75 ~ 9.5mm, 4.75 ~ 16mm, the ratio of each shelves is: 14%:28%:48%.
Limestone mineral powder, main component is calcium carbonate, requires the limestone mineral powder adopting limestone processing.The requirement of particle diameter is that the percent of pass that the percent of pass of percent of pass 100%, the 0.15mm sieve aperture of 0.6mm sieve aperture is greater than 90%, 0.075mm is greater than 75%.
Be made up of the component of following weight part:
2. above-mentioned materials is prepared compound Warm-Mix Bitumen Mixture according to the following steps:
The preparation method of compound Warm-Mix Bitumen Mixture, comprises the following steps:
Step one: will gather materials after being heated to 160 ± 5 DEG C, and add limestone mineral powder in proportion, stirs 8 ~ 12s;
Step 2: compound warm mix properties-correcting agent is added and mixes pot;
Step 3: be after 170 ± 5 DEG C by asphalt heating temperature; Join in the mixture of step 2, continue stirring 80 ~ 100s, whipping temp is 160 ± 5 DEG C, obtains compound Warm-Mix Bitumen Mixture.
Embodiment two
1. material prepares:
Warm mix properties-correcting agent, adopts compound warm mix properties-correcting agent, and compound warm mix properties-correcting agent is made up of 50% wood fibre, 40% zeolite and 10% saturated hydrocarbon.
Pitch, adopts SBS modifying asphalt.
Gravel aggregate, also known as aggregate.One of main composition material of bituminous concrete, mainly plays skeleton function and reduces due to the volume change of gelling material in setting and harden process caused by expand with wet and contract with dry, simultaneously also as the cheap stopping composition of gelling material.Have natural aggregate and artificial aggregate point, the former is as rubble, cobble, float stone, natural sand etc.; The latter is as cinder, slag, haydite, pearlstone etc.The gravel aggregate that the present embodiment adopts is divided into following third gear: 0 ~ 4.75mm, 4.75 ~ 9.5mm, 4.75 ~ 16mm, the ratio of each shelves is: 14%:27%:48%.
Limestone mineral powder, main component is calcium carbonate, requires the limestone mineral powder adopting limestone processing.The requirement of particle diameter is that the percent of pass that the percent of pass of percent of pass 100%, the 0.15mm sieve aperture of 0.6mm sieve aperture is greater than 90%, 0.075mm is greater than 75%.
Be made up of the component of following weight part:
2. above-mentioned materials is prepared compound Warm-Mix Bitumen Mixture according to the following steps:
The preparation method of compound Warm-Mix Bitumen Mixture, comprises the following steps:
Step one: will gather materials after being heated to 160 ± 5 DEG C, and add limestone mineral powder in proportion, stirs 8 ~ 12s;
Step 2: compound warm mix properties-correcting agent is added and mixes pot;
Step 3: be after 170 ± 5 DEG C by asphalt heating temperature; Join in the mixture of step 2, continue stirring 80 ~ 100s, whipping temp is 160 ± 5 DEG C, obtains compound Warm-Mix Bitumen Mixture.
Embodiment three
1. material prepares:
Warm mix properties-correcting agent, adopts compound warm mix properties-correcting agent, and compound warm mix properties-correcting agent is made up of 50% wood fibre, 40% zeolite and 10% saturated hydrocarbon.
Pitch, adopts SBS modifying asphalt.
Gravel aggregate, also known as aggregate.One of main composition material of bituminous concrete, mainly plays skeleton function and reduces due to the volume change of gelling material in setting and harden process caused by expand with wet and contract with dry, simultaneously also as the cheap stopping composition of gelling material.Have natural aggregate and artificial aggregate point, the former is as rubble, cobble, float stone, natural sand etc.; The latter is as cinder, slag, haydite, pearlstone etc.The gravel aggregate that the present embodiment adopts is divided into following third gear: 0 ~ 4.75mm, 4.75 ~ 9.5mm, 4.75 ~ 16mm, the ratio of each shelves is: 14%:27%:48%.
Limestone mineral powder, main component is calcium carbonate, requires the limestone mineral powder adopting limestone processing.The requirement of particle diameter is that the percent of pass that the percent of pass of percent of pass 100%, the 0.15mm sieve aperture of 0.6mm sieve aperture is greater than 90%, 0.075mm is greater than 75%.
Be made up of the component of following weight part:
2. above-mentioned materials is prepared compound Warm-Mix Bitumen Mixture according to the following steps:
The preparation method of compound Warm-Mix Bitumen Mixture, comprises the following steps:
Step one: will gather materials after being heated to 160 ± 5 DEG C, and add limestone mineral powder in proportion, stirs 8 ~ 12s;
Step 2: compound warm mix properties-correcting agent is added and mixes pot;
Step 3: be after 170 ± 5 DEG C by asphalt heating temperature; Join in the mixture of step 2, continue stirring 80 ~ 100s, whipping temp is 160 ± 5 DEG C, obtains compound Warm-Mix Bitumen Mixture.
Following performance test is carried out to the compound Warm-Mix Bitumen Mixture of above-described embodiment:
A. high-temperature behavior analysis
Asphalt, under the repeat function of traffic load, can cause road surfaces to occur rut due to the accumulation of tension set.Rut is one of primary damage phenomenon of bituminous pavement.From the breakoff phenomenon analysis of China's bituminous pavement, in all kinds of breakoff phenomenon, rut problem is especially serious.In other developed country, as states such as the U.S., France, Belgium, Japan, express highway pavement overhaul or cover reason in, rut accounts for more than 80%.Traditional method adopts this intensity index of Marshall stability to estimate the rut of bituminous pavement, but a lot of results of study shows, Marshall stability and road surface actual use properties dependency is bad, be difficult to set up the correlationship with pavement performance index, and its changing greatly with material and grating.Wheel tracking test is that employing small-sized wheel is back and forth walked on the plate-like test specimen of asphalt, thus make plate test specimen form rut groove, and by measuring the relation of wheel load effect number of times and plate test piece deformation, draw rate of deformation or dynamic stability, as asphalt resistance to permanent deformation performance index.This test method is relatively more directly perceived, good, simple to operate to the simulation of asphalt pavement rut forming process, and easily by engineering is accepted, for this reason, the present invention adopts wheel tracking test as the evaluation method of compound Warm-Mix Bitumen Mixture high-temperature stability.The results are shown in Figure 1.When grating is identical, compound Warm-Mix Bitumen Mixture has higher dynamic stability compared with hot-mix asphalt mixture, and this illustrates that the high-temperature stability of compound Warm-Mix Bitumen Mixture is better than the high-temperature stability of corresponding hot-mix asphalt mixture.
B. low-temperature cracking-resistance analysis
It has been generally acknowledged that crack is one of major defect of bituminous pavement, the crack that initial stage produces is general without significantly impact on driving, but along with the intrusion of surface rain water or dew, under a large amount of traffic load repeated action, cause pavement strength obviously to reduce, produce and wash away and purt mud phenomenon, crack is widened, the oil mat of both sides, crack is cracked, and the road surface after cracking may fracture into the plate of smaller szie and tortoise plastron shape fatigue cracking occurs; Crack is widened year by year, edges broken, and surface evenness is obviously declined, vehicle by time will produce significantly vibration, affect the use properties of bituminous pavement, and accelerate the destruction of bituminous pavement.Low-temperature bending test is adopted to carry out the low-temperature performance of Research on Asphalt Mixture, by the mechanics parameter of compound flexural failure when specified temperature and loading rate---destroy the crack resistance at low-temperature that asphalt is evaluated in flexural-tensile strain, test temperature-10 DEG C.The results are shown in Figure 2.From low-temperature bending test result, under cryogenic, the destruction flexural-tensile strain of compound Warm-Mix Bitumen Mixture and corresponding hot-mix asphalt mixture strain facies are worked as, and show that compound warm mix properties-correcting agent does not affect low temperature performance of asphalt substantially.
C. anti-water damage property analysis
Moisture Damage is one of Major Diseases of bituminous pavement.Moisture Damage is bituminous pavement under the effect of water or freeze-thaw cycle, due to the effect of vehicle dynamic load, the water entered in space, road surface constantly produces the iterative cycles effect of hydrodynamic pressure or negative pressure of vacuum suction, moisture penetrates into pitch gradually with on the interface gathered materials, asphalt adhesion is made to reduce and lose cohesive force gradually, pitch is peeled off from surface of aggregate, and compound falls grain, loose, then forms the hole groove of bituminous pavement, pushes distortion etc. and damage phenomenon.Except the externalitiess such as load and moisture supply conditions, the anti-water damage ability of asphalt is the basic factor determining road surface water stability.
The present invention adopts the common evaluating combined type Warm-Mix Bitumen Mixture anti-water damage property of indirect tensile test on frozen-thaw T0729 and immersion Marshall test T0709, the results are shown in Figure 3 and Fig. 4.The freeze-thaw split strength ratio of compound Warm-Mix Bitumen Mixture has compared certain change with immersion Marshall intensity with hot-mix asphalt mixture, the scope of change is smaller, within the scope of normal experimental fluctuations, illustrate that water stability and the hot-mix asphalt mixture of the Warm-Mix Bitumen Mixture adopting compound warm mix technology to obtain are suitable, meet code requirement.
D. anti-fatigue performance analysis
The fatigue property of bituminous concrete directly affects the work-ing life of bituminous pavement.During pavement usage, under ambient temperature effect, stand the repeated action of wheel load.Its stress, strain are in crossover change state for a long time.Pavement structural strength is caused to decline gradually.After load repeat function exceedes certain number of times, the stress produced in road surface will exceed the structure reactance after pavement structural strength decline, makes road surface produce fatigue crack.The early stage phenomenon of fatigue cracking is that road surface occurs continual crack longitudinal, finally causes road surface to occur check crack, be full of cracks, even cheats groove.Asphalt fatigure failure mechanism is extremely complicated, affects the many factors of asphalt fatigue lifetime, and the interphase interaction of each factor.The present invention, by having carried out tired split test to different rubber powder content asphalt, analyzes the anti-fatigue performance of rubber-asphalt mixture.Adopt UTM tester to carry out experiment on fatigue properties, unidirectional without side pressure, mould uses the fixture of split test.Test test specimen adopts standard marshall compaction test specimen, unidirectional without side pressure, uses the fixture of split test, and adopt stress control mode, test precompression is 10kPa, and squeeze time is 1 minute.The load applied is sine pulse load, and load is 0.7MPa; Burst length 0.1s, interval 0.9s, test temperature is 20 DEG C.Owing to being the fatigue test of stress control, in fatigue process, strain constantly increases along with the increase of CYCLIC LOADING number of times, the damage of material internal is also constantly increasing, when reaching certain number of times, bitumen mixture specimen will rupture, and now corresponding load Circulation number of times is the fatigue lifetime of material.The results are shown in Figure 5.
Table 1 compound splitting fatigue test-results
Test-results from table 1 and Fig. 5, under identical stress level, no matter adopt which kind of pitch, the fatigue property of compound Warm-Mix Bitumen Mixture is slightly better than corresponding hot-mix asphalt mixture, illustrate that to mix and stir temperature low due to compound Warm-Mix Bitumen Mixture, ageing of asphalt degree reduces, and its fatigue property is better than the hot-mix asphalt mixture of identical gradation types.
The main performance index test-results of each embodiment is in table 2, and the comparative example one to three in table 2 is identical with table 1.
The performance test results of table 2 different gradation compound
Interpretation of result:
(1) when identical gradation types, the dynamic stability of compound Warm-Mix Bitumen Mixture is better than hot-mix asphalt mixture, and this illustrates that the Warm-Mix Bitumen Mixture adopting compound warm mix technology to obtain has better high-temperature stability.
(2) low-temperature cracking-resistance of compound Warm-Mix Bitumen Mixture, water stabilizing are all suitable with corresponding hot-mix asphalt mixture performance, and can meet code requirement.
(3) under identical stress level, due to compound Warm-Mix Bitumen Mixture, to mix and stir temperature low, and ageing of asphalt degree reduces, and its fatigue property is better than the hot-mix asphalt mixture of identical gradation types.
Above result, the comparison example in Figure of description and the comparison example in form match.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. a compound Warm-Mix Bitumen Mixture, is made up of the component of following weight percent:
2. compound Warm-Mix Bitumen Mixture according to claim 1, is characterized in that: described compound warm mix properties-correcting agent by weight percentage, by the wood fibre of 50%, the zeolite of 40% and 10% saturated hydrocarbon form.
3. compound Warm-Mix Bitumen Mixture according to claim 1, is characterized in that: described in gather materials and be divided into following third gear: 0-4.75mm, 4.75-9.5mm, 4.75-16mm, the ratio of each shelves is: 10-18%:23-33%:43-53%.
4. compound Warm-Mix Bitumen Mixture according to claim 1, is characterized in that: the particle diameter of described limestone mineral powder is 0.6mm, and the percent of pass of sieve aperture is that the percent of pass that the percent of pass of 100%, 0.15mm sieve aperture is greater than 90%, 0.075mm is greater than 75%.
5. a preparation method for compound Warm-Mix Bitumen Mixture, comprises the following steps:
Step one, by described gather materials be heated to 160 ± 5 DEG C after, add limestone mineral powder in described ratio, stir 10 ~ 15s;
Step 2, continuation add the compound warm mix properties-correcting agent of described ratio, without the need to mixing and stirring;
Step 3, described SBS modifying asphalt is heated to 170 ± 5 DEG C after, add in the mixture of step 2, stir 80 ~ 100s, whipping temp is 160 ± 5 DEG C, obtains compound Warm-Mix Bitumen Mixture.
6. the preparation method of compound Warm-Mix Bitumen Mixture according to claim 5, is characterized in that: in described step 3, after adding SBS modifying asphalt, and wet-mixing 80 ~ 100s.
7. the preparation method of compound Warm-Mix Bitumen Mixture according to claim 6, is characterized in that: the time of described wet-mixing is 90s.
8. an application for compound Warm-Mix Bitumen Mixture, is characterized in that: described compound Warm-Mix Bitumen Mixture is in construction process, and rolling temperature is 140 ± 5 DEG C.
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| CN106938899A (en) * | 2017-03-29 | 2017-07-11 | 长沙理工大学 | A kind of modified asphalt mixture method for designing suitable for different temperature difference area |
| CN106938899B (en) * | 2017-03-29 | 2019-04-02 | 长沙理工大学 | A kind of modified asphalt mixture design method suitable for different temperature difference areas |
| CN108585605A (en) * | 2018-06-11 | 2018-09-28 | 长安大学 | A kind of thermal resistance ordor removing warm mix Multifunctional asphalt modifying agent and its preparation method and application |
| CN108585605B (en) * | 2018-06-11 | 2020-09-04 | 长安大学 | Heat-resistant and odor-free warm-mixing multifunctional asphalt modifier and preparation method and application thereof |
| CN116283066A (en) * | 2023-01-06 | 2023-06-23 | 黑龙江大学 | High-performance asphalt mixture prepared from chicken graphite tailings in AC-16 grading manner and preparation method of asphalt mixture |
| CN116283066B (en) * | 2023-01-06 | 2023-12-26 | 黑龙江大学 | High-performance asphalt mixture prepared from chicken graphite tailings in AC-16 grading manner and preparation method of asphalt mixture |
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Application publication date: 20160120 |