CN102807339A - Coarse colloidal particle and rubber asphalt mixed material - Google Patents
Coarse colloidal particle and rubber asphalt mixed material Download PDFInfo
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- CN102807339A CN102807339A CN2012103012035A CN201210301203A CN102807339A CN 102807339 A CN102807339 A CN 102807339A CN 2012103012035 A CN2012103012035 A CN 2012103012035A CN 201210301203 A CN201210301203 A CN 201210301203A CN 102807339 A CN102807339 A CN 102807339A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a coarse colloidal particle and rubber asphalt mixed material, which comprises matrix asphalt, bias-ply tire 20-mesh rubber powder and a stone material, wherein the mixing dosage of the rubber powder in rubber asphalt is 18: 82 in percentage by the weight of the matrix asphalt. When the stone material is respectively screened through sieves with sieve pores of 16 millimeters, 13.2 millimeters, 9.5 millimeters, 4.75 millimeters, 2.36 millimeters and 0.075 millimeter, the passing rates, namely the gradations, of the stone material are 100%, 80-100%, 50-60%, 27-32%, 20-25% and 4.5-6.5%. The gradations of the coarse colloidal particle and rubber asphalt mixed material are coarser; the clearance rate of a mineral aggregate of the mixed material is bigger; in order to prevent the large-particle rubber powder from generating an interference action with the gradations of the mineral aggregate after fusing and expanding to influence a compaction effect and a pavement performance, the content of a 2.36-4.75 grade is strictly controlled; the content is required to be 3-12%, so that more space is provided for the rubber powder in the rubber asphalt; and therefore, the compaction performance of a road surface and the rut resistance capability of the road surface are improved. Compared with rubber asphalt mixed materials with other gradations, the coarse colloidal particle and rubber asphalt mixed material has the characteristics that the asphalt dosage is lower, the embedment performance and the squeezing performance are high, and the structure depth is high, and moreover, each pavement performance is prominent.
Description
Technical field
The invention belongs to pavement construction material, be specifically related to a kind of thick micelle rubber-asphalt mixture.
Background technology
Along with the fast development of Chinese national economy and the raising of living standards of the people, automobile pollution increases sharply year by year, and China also is faced with the handling problem of a large amount of junked tires that developed countries runs in early days.Junked tire is used for bituminous pavement has been proved to be a kind of cost-effective recycling approach.
With index, the over-all properties of tire material will be much better than pitch from each item road, and rubber and pitch belongs to macromolecule organic material together, possess natural affinity to a certain degree, so rubber modified asphalt more and more receives investigator's concern.The research that oneself has shows: improve a lot than unfilled bitumen service life of road surface in the waste rubber powder modified asphalt road surface, can improve heat-resisting, the winter hardiness on road surface simultaneously, and can reduce noise, anti-wet and slippery, trash ice snow, improved SF.Waste rubber powder modified asphalt combines the improvement of waste rubber and asphalt performance, is that collection energy-saving and environmental protection and new product development are the effective way of the Nonrenewable energy resources regenerated using of one.Therefore, this technology has received the increasing attention in various countries.
The grating design is the core and the difficult point of Rubber-Asphalt Pavement technology.What application was more at present is the gap gradation design.The tradition gap gradation has bigger void in mineral aggregate, can at utmost hold rubber asphalt, to improve the resistance to cleavage and the anti-fatigue performance on road surface.But the breeze content ratio of traditional gap gradation is 0, and fill with rubber asphalt fully in the mineral aggregate gap, and structure pitch ratio is lower, and high-temperature behavior is general.The use of breeze helps the reduction of rubber asphalt voidage, also improves simultaneously the anti-fatigue performance of compound to a certain extent, so the present invention suitably increases breeze content in the middle of designing grating, to remedy the deficiency of traditional gap gradation.Secondly, traditional gap gradation is only controlled each sieve aperture percent of pass, and this integral body control for graduation curve is very favourable, makes its clear and definite.But rubber asphalt belongs to unstable mixed system; Especially for the thick glue granulated rubber of 20 orders pitch; Rubber powder granule after it expands is very serious for the interference of grading of aggregate; Therefore and this interference effect is primarily aimed at 2.36～4.75 grades of fine aggregates, is necessary these shelves ratio of gathering materials is limited.The present invention fully with reference to the high characteristics of gap gradation void in mineral aggregate, suitably increases the breeze ratio, controls 2.36～4.75 grades of fine aggregate content, to improve high-temperature behavior, compaction capacity and the anti-fatigue performance of rubber-asphalt mixture.
Summary of the invention
The object of the present invention is to provide a kind of thick micelle rubber-asphalt mixture with higher construction workability and excellent road performance.
The thick micelle rubber-asphalt mixture that the present invention proposes is made up of rubber asphalt and building stones, and the quality of rubber asphalt accounts for 6.0～7.5% of building stones quality, and said rubber asphalt is made up of matrix pitch and rubber powder, and rubber powder accounts for 18% (in mix) of rubber asphalt quality; Said building stones are when being the screening of 16,13.2,9.5,4.75,2.36,0.075 mm sieve through sieve aperture respectively; Its through mass percent be grating be 100%, 80～100%, 50～60%, 28～32%, 20～24% and 4.5-6.5%; Control 2.36～4.75 grades of content, content requirement is 3 ~ 12%.
Among the present invention, said building stones are Irish touchstone, faller gill shape content≤10%.
Among the present invention, the sieve size of said rubber powder is 20 orders～30 orders.
The voidage of the thick micelle rubber-asphalt mixture of gained of the present invention is 3.5～4.5%, and void in mineral aggregate is 17～21%.
The preparation method of the thick micelle rubber-asphalt mixture that the present invention proposes, concrete steps are: by proportioning raw materials matrix pitch and rubber powder are mixed, obtain rubber asphalt; Gained rubber asphalt and building stones are mixed, obtain desired product.
Thick glue granulated rubber asphalt mixture gradation of the present invention the percent of pass (grating) in corresponding aperture 9.5 be 80～100%, be higher than common gap gradation rubber-asphalt mixture.Because the raising of big particle diameter aggregate ratio for compound supports than large space, forms skeleton structure, all the other spaces are filled by fine aggregate and rubber powder pitch, finally form the framework compact type structure, because grating is thicker, the void in mineral aggregate of compound is bigger.The grading limit of existing rubber-asphalt mixture is only narrated the upper limit and the lower limit of the percent of pass that gathers materials, and the usage ratio that a certain scope is gathered materials is not done particular requirement, and this is perfect inadequately as far as the coarse particles rubber asphalt.Because 20 orders ~ 30 order rubber powders in the preparation process swelling can take place, volume increases obviously, so its interference effect to the compound fine aggregate is very serious, causes the compacting difficulty, and difficulty of construction improves.Pairing 2.36～4.75 grades of ratios of grating according to the invention are 3～12%, and this grade consumption is lower, have evaded after rubber grain expands to the full extent and the interference effect of fine aggregate, are convenient to rubber grain and are filled between the aggregate, improve compaction capacity.The rubber-asphalt mixture voidage of processing according to technique means according to the invention is than the low 0.5%-1.5% of other types compound.Asphalt content reduces about 1%-2%.
Different with traditional gap gradation rubber-asphalt mixture, use breeze in the compound according to the invention.The design of tradition gap gradation considers that the filler effect of breeze is similar with rubber powder, does not therefore use breeze, to increase asphalt content.It is considered herein that the filling effect of breeze and coarse particles rubber asphalt are not quite similar, the two mainly acts in the different-grain diameter scope, does not therefore have interference effect.And breeze the more important thing is the cohesive action of in compound, playing with the formed rubber cement of rubber asphalt binder except filling effect, form bulk strength and weather resistance with this.The disappearance of breeze can cause the raising of asphalt content; Though fatigue property can be highly improved; But be cost to sacrifice high-temperature stability; Therefore the present invention uses the suitable proportion breeze under the prerequisite that does not influence fatigue properties of asphalt mixture and crack resistance at low-temperature, and this helps fully showing of the anti-rut performance of compound high temperature.
Related coarse particles rubber powder among the present invention is oblique tire 20 order rubber powders, and itself and rubber asphalt mass percent are 18%.Adopt the coarse particles rubber powder to consider based on two aspects: one of which, reduce rubber asphalt preparation and storage difficulty, be convenient to Construction control.Pavement engineering is many with 40～80 order rubber powders at present, and its particle is less, is convenient to fully reflect with matrix pitch; But the temperature and time control condition in its construction process is had relatively high expectations; Particularly harsh to condition of storage and time requirement, long reaction (storage) time, or too high reflection (storage) temperature all can make the small particle size rubber powder granule be dissolved among the pitch fully; The premium properties of forfeiture rubber asphalt deviates from the modification original intention.Its two, use thick rubber powder to help reducing the Rubber processing expense, reduce the integral construction cost.Rubber powder is thin more, and high more to the complete processing and the flow process requirement of rubber powder, expense is also with regard to corresponding improve.About 5000 yuan/ton of 80 order rubber powder prices, 40 orders are 4000 yuan/ton, 20 order rubber powder prices then are lower than 3000 yuan/ton.Therefore, the present invention can reduce rubber asphalt and prepare price, helps the popularization on a large scale of rubber asphalt technology.
Embodiment
Below in conjunction with specific embodiment the present invention is further specified.
Embodiment 1
Adopting rubber powder is oblique tire rubber powder, and the order number is 20 orders, and matrix pitch is a 70# road A level pitch, and rubber powder and matrix pitch mass ratio are 18:82, and 1h is stirred in the shop experiment chamber, and whipping temp is 180 ℃, and stir speed (S.S.) is 400rad/s." rubber asphalt and compound design and construction technical manual " with Research Institute of Highway, Ministry of Communications's promulgation is code requirement, and prepared rubber asphalt performance perameter is seen table 1.1.
Table 1.1 embodiment 1 rubber asphalt test detected result
| Project | Test-results |
| Viscosity, 180 ℃, Pa.S | 3.5 |
| Penetration degree (25 ℃, 100g, 5s), 0.1mm, minimum | 35.5 |
| Softening temperature, ℃, minimum | 58.8 |
| Recovery of elasticity, 25 ℃, %, minimum | 88 |
Table 1.1 explanation meets the related specifications requirement according to rubber asphalt each item index of flow preparation according to the invention, can further carry out the rubber-asphalt mixture design.
The 13.2mm of gathering materials percent of pass scope according to the invention is 80% ~ 95%; This percent of pass scope is compared less with traditional gap gradation, purpose is to improve the coarse aggregate content ratio, for compound supports than large space; Fully form skeleton structure, all the other spaces are filled by rubber asphalt and fine aggregate.
The 13.2mm percent of pass of embodiment 1 is chosen the grating lower limit, goes up largely and improves void in mineral aggregate.2.36 ~ 4.75mm shelves ratio is 10%, content is higher.Present embodiment is in order to prove under 2.36 ~ 4.75mm shelves usage ratio upper limit case the compacting of compound and pavement performance.Building stones are chosen Jiangsu Irish touchstone, and grating is shown in table 1.2:
Table 1.2 embodiment 1 mixture gradation
By above-mentioned grating,, confirm that finally best oilstone mass ratio is 7.0% through Marshall Test.Prepared rubber asphalt concrete test specimen, the related volume index is seen table 1.3.
Table 1.3 embodiment 1 test specimen volumetric parameter
| Maximum theory density | Bulk density | VV% | VFA(%) | VMA(%) |
| 2.531 | 2.418 | 4.2 | 78.2 | 19.3 |
Shown that by the volumetric parameter test-results rubber-asphalt mixture test specimen voidage of this embodiment is lower, compared to traditional gap gradation compound, test specimen more is prone to compacting.Void in mineral aggregate is bigger, attaches with the embedding bank run supplying sufficient room for wrapping up in of coarse particles rubber powder.
According to designing grating and oilstone quality than mix compound, with wheel tracking test Evaluation of asphalt mixture high temperature stability performance.Rut plate test specimen adopts the moulding of rolling method, is of a size of 30 * 30 * 5cm, and the tire contact pressure is 0.7MPa, travel distance 23cm, and 42 times/min of speed, test temperature is 60 ℃.Obtain time-deformation curve by sensing and recording unit, calculate dynamic stability, the result sees table 1.4.
Table 1.4 embodiment 1 test specimen wheel tracking test result
The result shows by wheel tracking test, and the rubber-asphalt mixture test specimen dynamic stability of this embodiment is bigger, and higher high temperature rutting resistance is arranged.
Adopt compacting process moulding marshal piece, two-sided respectively hitting real 50 times deposited the time behind the intact test specimen of moulding.During test test specimen is divided into two groups at random, first group of test specimen placed on the platform, at room temperature preserve subsequent use.With the full water 15min of second group of test specimen vacuum, under normal pressure, in water, place 0.5h then.Take out test specimen and put into plastics bag, add the water of about 10mL, put into constant temperature refrigerator 16h.Put into 60 ℃ of Water Tanks with Temp.-controlled afterwards immediately, remove plastics bag, insulation 24h.The whole Water Tanks with Temp.-controlled that immerse 25 ℃ of two groups of test specimens are no less than 2h, carry out split test then, the result sees table 1.5.
Table 1.5 embodiment 1 test specimen freeze thawing split test result
Show that by the freeze thawing split test rubber-asphalt mixture test specimen water stability of this embodiment satisfies code requirement.
Embodiment 2
The design of rubber asphalt, preparation flow are said with embodiment 1.
The 13.2mm percent of pass of embodiment 2 grating that adopts is 95%, is the upper limit of invention grating, and used coarse aggregate ratio is minimum, and this grating meets China's standard about the requirement of SMA graduation curve.2.36 ~ 4.75mm shelves ratio is 5%, and is near the suggestion Schwellenwert, comparatively faint with the interference effect of rubber powder granule.For improving the high-temperature behavior of compound, suitably increase the breeze consumption.Present embodiment is in order to prove under 2.36 ~ 4.75mm shelves usage ratio lower limit situation the compacting of compound and pavement performance.Building stones are chosen Zhejiang Irish touchstone, and grating is shown in table 2.1:
Table 2.1 embodiment 2 mixture gradations
By above-mentioned grating,, finally confirm best oilstone mass ratio 6.5% through Marshall Test.Prepared rubber asphalt concrete test specimen, the related volume index is seen table 2.2.
Table 2.2 embodiment 2 test specimen volumetric parameters
| Maximum theory density | Bulk density | VV% | VFA(%) | VMA(%) |
| 2.548 | 2.459 | 3.3 | 81.3 | 17.4 |
Can be analyzed by the volume index of embodiment 2 and to draw, when 2.36 ~ 4.75mm shelves ratio during near the suggestion Schwellenwert, the voidage of compound descends obviously, meets the voidage requirement to the SMA grating.The bituminous saturation ratio is higher simultaneously, is filled into fully in the middle of the gap of mineral aggregate, and is very faint with the interference effect of mineral aggregate.
According to designing grating and oilstone quality than mix compound, with wheel tracking test Evaluation of asphalt mixture high temperature stability performance, the result sees table 2.3.
Table 2.3 embodiment 2 test specimen wheel tracking test results
Visible by table 2.3, the rubber-asphalt mixture dynamic stability that present embodiment designed is higher.Reducing the fine aggregate percent of pass; Particularly 2.36 ~ 4.75mm shelves gather materials after the usage ratio, the bigger lifting of the dynamic stability of compound, and this is because rubber powder granule is gone up with the interference effect that gathers materials largely weakens; Compound is easy to compacting; Reduced the oilstone mass ratio, improved compound, improved the anti-rut performance of its high temperature in condition of high temperature non-deformability.The used aggregate grading of present embodiment meets the requirement of SMA graduation curve, and different is breeze content is low slightly and do not use fiber filled.Rubber asphalt and breeze form the rubber asphalt matizhi and fill the mineral aggregate gap, and the compound high-temperature behavior is good.
With the water stability ability of freeze thawing split test mensuration compound, the result sees table 2.4.
Table 2.4 embodiment 2 test specimen freeze thawing split test results
Show that by the freeze thawing split test rubber-asphalt mixture test specimen water stability of this embodiment satisfies code requirement, and makes moderate progress than embodiment 1.
Embodiment 3
The design of rubber asphalt, preparation flow are said with embodiment 1.
Embodiment 1 and embodiment 2 prove under the upper limit and lower limit situation of 2.36 ~ 4.75mm shelves usage ratio the compaction capacity of rubber-asphalt mixture and pavement performance respectively.Present embodiment is moderate in order to prove 2.36 ~ 4.75mm shelves usage ratio, and promptly content is under 8% situation, the performance of rubber-asphalt mixture.
Building stones are chosen Jiangsu Irish touchstone, and grating is shown in table 3.1:
Table 3.1 embodiment 3 mixture gradations
By above-mentioned grating, through Marshall Test, final definite the best is an oilstone mass ratio 6.9%.Prepared rubber asphalt concrete test specimen, the related volume index is seen table 3.2.
Table 3.2 embodiment 3 test specimen volumetric parameters
| Maximum theory density | Bulk density | VV% | VFA(%) | VMA(%) |
| 2.540 | 2.443 | 3.8 | 79.8 | 18.8 |
Can analyze by table 3.2 and to draw, totally between embodiment 1 and embodiment 2, demonstrate stronger regularity according to the volumetric parameter of the rubber asphalt concrete test specimen of embodiment 3 gratings institute moulding.
According to designing grating and oilstone quality than mix compound, with wheel tracking test Evaluation of asphalt mixture high temperature stability performance.The result sees table 3.3.
Table 3.3 embodiment 3 test specimen wheel tracking test results
With the water stability ability of freeze thawing split test mensuration compound, the result sees table 3.4.
Table 3.4 embodiment 3 test specimen freeze thawing split test results
Show that by the freeze thawing split test rubber-asphalt mixture test specimen water stability of this embodiment satisfies code requirement.
Comparative Examples 1
The design of rubber asphalt, preparation flow are said with embodiment 1.
In the middle of the grating design of Comparative Examples 1, chosen typical no breeze gap gradation, 2.36 ~ 4.75mm shelves content is 14%, the 13.2mm percent of pass is 99.5%.
Building stones are chosen Jiangsu Irish touchstone, and grating is shown in table 4.1:
Table 4.1 Comparative Examples 1 mixture gradation
By above-mentioned grating, through Marshall Test, finally confirm that the best is the prepared rubber asphalt concrete test specimen of oilstone mass ratio 8.3%, the related volume index is seen table 4.2.
Table 4.2 Comparative Examples 1 test specimen volumetric parameter
| Maximum theory density | Bulk density | VV% | VFA(%) | VMA(%) |
| 2.485 | 2.372 | 4.5 | 79.3 | 21.7 |
Analyze and can know by 4.2, although the void in mineral aggregate of compound is 21.7%, the space that does not hold rubber grain, the interference effect of rubber powder and mineral aggregate is fairly obvious.Asphalt content be 8.3% and saturation ratio be 79.3%, but do not reduce the voidage of compound, compacting is difficulty comparatively.
According to designing grating and oilstone quality than mix compound, with wheel tracking test Evaluation of asphalt mixture high temperature stability performance.The result sees table 4.3.
Table 4.3 Comparative Examples 1 test specimen wheel tracking test result
Three embodiment of the dynamic stability of the compound of Comparative Examples shown in the table 4.3 and front compare low, and its reason mainly is 2 points: one of which, and the density of compound is lower, and voidage is higher, causes the compaction deformation in early stage of wheel tracking test bigger; Its two, asphalt content is excessive, and breeze disappearance, the adhesive property of rubber asphalt a little less than, therefore influenced its high-temperature stability.
In addition, higher asphalt content has improved engineering cost greatly, is unfavorable for the popularization and the engineering practice application of rubber asphalt technology.
With the water stability ability of freeze thawing split test mensuration compound, the result sees table 4.4.
Table 4.4 Comparative Examples 1 test specimen freeze thawing split test result
Show that by the freeze thawing split test rubber-asphalt mixture test specimen water stability of this Comparative Examples satisfies code requirement.
Can know that by the embodiment 1 ~ 3 and the heat stability test result of Comparative Examples 1 grating that the present invention sets forth with the calking of rubber asphalt rubber cement, has improved the high temperature stability performance of compound owing to use breeze.The use of breeze helps the filling of mixture gap, uses lower oilstone mass ratio also when the pavement performance that satisfies compound requires, has reduced construction costs largely.
Claims (4)
1. a thick micelle rubber-asphalt mixture is characterized in that being made up of rubber asphalt and building stones, and the quality of rubber asphalt accounts for 6.0～7.5% of building stones quality, and said rubber asphalt is made up of matrix pitch and rubber powder, and rubber powder accounts for 18% of matrix pitch quality; Said building stones are when being the screening of 16,13.2,9.5,4.75,2.36,0.075 mm sieve through sieve aperture respectively; Its through mass percent be grating be 100%, 80～100%, 50～60%, 28～32%, 20～24% and 4.5-6.5%; Control 2.36～4.75 grades of content, content requirement is 3 ~ 12%.
2. thick micelle rubber-asphalt mixture according to claim 1 is characterized in that said building stones are Irish touchstone, faller gill shape content≤10%.
3. thick micelle rubber-asphalt mixture according to claim 1, the sieve size that it is characterized in that said rubber powder are 20 orders～30 orders.
4. thick micelle rubber-asphalt mixture according to claim 1, the voidage that it is characterized in that the thick micelle rubber-asphalt mixture of gained is 3.5～4.5%, void in mineral aggregate is 17～21%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186838A (en) * | 2016-07-15 | 2016-12-07 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material exempting from lignin |
| CN106969985A (en) * | 2017-04-28 | 2017-07-21 | 黑龙江省交通科学研究所 | A kind of detection method of LSM low temperature modifications asphalt stability |
| CN107082592A (en) * | 2017-05-19 | 2017-08-22 | 同济大学 | Carboxy-modified graphene oxide modified rubber asphalt mixture and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265053A (en) * | 2008-04-17 | 2008-09-17 | 江苏省交通科学研究院有限公司 | Asphalt-enriched discontinuous gradation rubber asphalt mixture |
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- 2012-08-23 CN CN2012103012035A patent/CN102807339A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265053A (en) * | 2008-04-17 | 2008-09-17 | 江苏省交通科学研究院有限公司 | Asphalt-enriched discontinuous gradation rubber asphalt mixture |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186838A (en) * | 2016-07-15 | 2016-12-07 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material exempting from lignin |
| CN106186838B (en) * | 2016-07-15 | 2019-01-25 | 黑龙江省中信路桥材料有限公司 | A kind of rubber asphalt Matrix mixing material for exempting from lignin |
| CN106969985A (en) * | 2017-04-28 | 2017-07-21 | 黑龙江省交通科学研究所 | A kind of detection method of LSM low temperature modifications asphalt stability |
| CN106969985B (en) * | 2017-04-28 | 2019-06-21 | 黑龙江省交通科学研究所 | A kind of detection method of LSM low temperature modification asphalt stability |
| CN107082592A (en) * | 2017-05-19 | 2017-08-22 | 同济大学 | Carboxy-modified graphene oxide modified rubber asphalt mixture and preparation method thereof |
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Application publication date: 20121205 |