CN101532273B - Anti-rutting road surface RS2000 modified asphalt mixture proportion and construction technology - Google Patents
Anti-rutting road surface RS2000 modified asphalt mixture proportion and construction technology Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 44
- 239000000203 mixture Substances 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- 239000002344 surface layer Substances 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 19
- 235000019738 Limestone Nutrition 0.000 claims description 7
- 239000006028 limestone Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
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- 238000000034 method Methods 0.000 abstract description 12
- 230000035699 permeability Effects 0.000 abstract 1
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- 150000001875 compounds Chemical class 0.000 description 15
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Classifications
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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 provides an anti-rutting road surface RS2000 modified asphalt mixture proportion and a construction technology which belongs to the road and bridge engineering technique field, relates to an asphalt road material proportion and construction technology. The anti-rutting road surface is composed of a basic layer, a down layer, a middle layer and an upper layer which has characteristic that: the middle layer and the upper layer use the RS2000 modified asphalt mixture, and uses corresponding construction scheme. The road constructed by the technique scheme has excellent performances than traditional asphalt road in planeness, compactness, cling property and water permeability coefficient.
Description
Technical field
The invention belongs to the road and bridge engineering technical field, relate to a kind of material grating and construction technology of asphalt roads.
Background technology
Rut is to influence the road main cause in application life.The generation of rut is subjected to the influence of following factor: ground surface material, and the asphalt road for generally using is easy to generate rut, asphalt content wherein, mineral aggregate gradation, and construction porosity, road structure pattern all are influence factors; In addition, traffic loading and environment for use are the transient causes that produces rut, and in environment for use, the temperature and humidity on road surface is two principal elements.
Rut is flexible pavement accumulation permanent deformation of material production in the deck under vehicular load acts on repeatedly, and this distortion is particularly outstanding when summer high temperature, and it mainly is because due to the pavement strength deficiency, especially the shear strength on road surface.By mole-coulomb principle as can be known, not produce the condition of shear failure under external force be that maximum shear stress is not more than the material anti-shear ability to material.When the shear strength of certain some shear stress above the road surface stress point, then can produce ground surface material and flow, form rut (or gathering around bag).
Rut is the technical barrier of flexible pavement.Over 20 years, technical staff author does a lot of work for this reason, but thoroughly solves rut not yet.
Traditional scheme mainly is to start with from improving material property.For improving flexible pavement high temperature rutting resistance, various countries have researched and developed many material modified at present, such as APAO, EVA, PE, SBS, SBR etc., but because this base polymer modifier (units up to ten thousand per ton or several ten thousand yuan) on the high side a bit, some is difficult for matrix pitch miscible, factors such as production equipment complexity finally can't large tracts of land be promoted the use of.
Studied from surface layer structure and test method again afterwards, very effective such as the SMA structure that Europe is released to improving rutting resistance, but difficulty of construction is big, the price height.The U.S. has released the SUPERPAVE test method again, after release the GTM test method again, promote the Mixture Ratio design level to step a stage.Play a good role to improving the road surface rutting resistance.
A large amount of experiments show that the principal element that influences asphalt pavement rut has three aspects: bituminous material, grating and road structure.Bituminous material is the cementing agent of aggregate, and the quality of its usefulness directly has influence on the road surface rutting resistance; And grating controlling road structure be subjected to force intensity and the compacted degree of aggregate embedding, the quantity of free asphalt is related to road surface viscoplasticity and road surface shear resistance; Suitable deck optimal design can better be brought into play the advantage of bituminous material and grating, surface layer structure, reaches the ability that improves pavement strength and anti-rut.
Modified bitumen is the critical material in the anti-rut design.The high-temperature behavior of raising pitch can be mixed with the building stones of its grating and be formed a kind of have good high-temperature toughness and flexible bituminous mixture.Wrap up in attached property, adhesion stress and inner frictional resistance by improving high temperature performance of asphalt, asphalt viscosity, optimization pitch and mineral mixture ratio with what improve pitch and building stones, reach the shear strength of raising bituminous mixture.Asphalt viscosity is high more, and its adhesion stress is big more, and shear strength is also just high more.Bituminous mixture is anti-shearing to draw fatigue strength with bending resistance by improving, and reaches the raising rutting resistance.
Optimizing grating also is the important step of anti-rut design.Carry out Gradation Optimization according to different regions, different weather, different surface layer structure and different road design loads, accomplish that modifier and matrix pitch and building stones etc. reach best proportioning, thereby make mixture performance reach best.
The road structure optimal design is an important ring of anti-rut.Surface thickness reasonable in design, according to the surface layer design theory, surface thickness depends on basic unit, bed course intensity, highway designing car flow etc.Usually the three layer construction that can adopt three surface layers in upper, middle and lower for the lower old base course of intensity or flexbile base deck optimal design can adopt the double-layer structure of upper and lower two surface layers for rigidity, semi-rigid type base.Concrete structure thickness need be by calculating and testing and try to achieve.
Problem about the origin cause of formation, influence factor and the Preventing Countermeasures of flexible pavement high temperature rut has been carried out much, but present design and construction method all can not thoroughly solve the rut problem of flexible pavement.The present invention will start with from bituminous material, by adopting the strong anti-rut of adhesiveness material modified as the bituminous mixture cementing agent, improve the attached property of wrapping up in of pitch and building stones, adhesion stress and inner frictional resistance greatly, reach the shear strength that improves bituminous mixture; Adopt the structure of suitable grating and optimization surface layer, improve the anti-deforming ability of bituminous mixture; Science construction as the case may be simultaneously, and then improve the asphalt pavement rut resisting ability.
Summary of the invention
The present invention utilizes the RS2000 modified bitumen of China's research and development, proposes the grating scheme of a kind of modified bitumen and building stones, and corresponding road structure and constructure scheme, designs a kind of anti-treadway payment, reaches to prolong the road purpose in application life.
To achieve these goals, the present invention has taked following technical scheme: anti-rutting road surface RS 2000 modified asphalt mixture proportioning and construction technology, anti-treadway payment is made of hypothallus, following surface layer, middle surface layer, upper layer, it is characterized in that: middle surface layer, upper layer adopt the RS2000 modified asphalt mixture, wherein:
(1) the upper layer optimum gradation is: 11-16mm: 6-11mm: 3-6mm: 0-5mm: breeze=16: 30: 10: 43: 1, best RS2000 modified bitumen consumption is 4.8%, wherein, 11-16mm, 6-11mm, 3-6mm are the coarse aggregate specification, and 0-5mm is a fine aggregate size;
(2) the surface layer optimum gradation is in: 10-20mm: 5-10mm: 0-5mm: breeze=43: 29: 26: 2, and best RS2000 modified bitumen consumption is 4.3%, and wherein, 10-20mm:5-10mm is the coarse aggregate specification, and 0-5mm is a fine aggregate size;
Its construction technology is:
(1) hypothallus, surface layer employing usual manner construction down;
When surface layer paved (2), temperature was not less than 155 ℃, and speed of application is 2-3m/min;
When (3) upper layer paved, temperature was not less than 160 ℃, and speed of application is 2-3m/min;
(4) first pressing, temperature are not less than 150 ℃, and speed of application is 2-3km/h;
(5) the multiple pressure, temperature is not less than 130 ℃, and speed of application is 3-5km/h;
(6) final pressure, temperature are not less than 90 ℃, and speed of application is 3-6km/h.
Coarse aggregate in the upper layer adopts the diabase rubble, and fine aggregate adopts limestone, and breeze adopts Dean Wu Shan breeze.
Coarse aggregate in the middle surface layer adopts limestone, and fine aggregate adopts limestone, and breeze adopts Dean Wu Shan breeze.
Compare with the standard road surface, the present invention has the following advantages:
1. the average б value of planeness is 0.86mm, less than standard б=1.2mm.
2. 98% of the degree of compaction overgauge.
3. friction factor reaches 76, is far longer than 45 of code requirement.
4. infiltration coefficient is 9.2ml/min, is far smaller than the 300ml/min that is of regulation and stipulation.
The specific embodiment
Present embodiment is the transformation to one section speedway.After the road surface main Construction Plan is the old asphalt surface course of milling, handle basic unit's disease, and in basic unit, utilize the cement stabilized macadam compound to carry out that horizontal road camber is two to change monotropic changing, the average 12cm plantmix cold regeneration mix of constructing again, surface layer+4cm upper layer among surface layer+6cm under the 6cm that constructs successively on it.Wherein middle surface layer and upper layer adopt the scheme of the present invention's design.In order to improve the road surface rutting resistance, adopt surface layer cementitious matter in the conduct of RS2000RS-3 type anti-rutting asphalt, adopt RS20002RS-2 as the upper layer cementitious matter.RS2000RS-3 and RS20002RS-2 type anti-rutting asphalt are the series modified pitch of RS2000RS that China produces.Its construction process is as follows:
1. the system of mixing of compound
(1) selection of upper layer mineral aggregate and with the level mixing ratio of modified bitumen: the diabase rubble that coarse aggregate adopts Dean Nie Qiao stock ground to produce, specification: 3-6mm, 6-11mm, 11-16mm; The limestone that fine aggregate adopts Dean Nie Qiao stock ground to produce, specification is 0-5mm, breeze is a Dean Wu Shan breeze; Modified bitumen is the RS20002RS-2 modified bitumen.The optimum gradation of compound is: 11-16mm: 6-11mm: 3-6mm: 0-5mm: breeze=16: 30: 10: 43: 1; Modified bitumen is 4.8%.
(2) in the selection of surface layer mineral aggregate and with the level mixing ratio of modified bitumen: coarse aggregate adopts Jiujiang County to live the ore deposit, mountain range to pacify prosperous stock ground limestone, and specification is: 0-5mm, 5-10mm, 10-20mm, breeze are Dean Wu Shan breeze; Modified bitumen is the RS20002RS-3 modified bitumen.The optimum gradation of compound is: 10-20mm: 5-10mm: 0-5mm: breeze=43: 29: 26: 2; Modified bitumen is 4.3%.
(3) grade coarse aggregate for preparing and pitch drop in the lorry mounted mixer after metering by the definite consumption of building site match ratio, and breeze directly adds from dog-house after metering.Temperature when various material are sent into lorry mounted mixer such as following table:
Table 1 bituminous mixture mix and stir temperature (℃)
(4) specified quantity gather materials and pitch is knocked down in the lorry mounted mixer after metering and is mixed and stirred, two kinds of materials fully mix and stir until all particles and are wrapped by asphalt membrane fully equably, bituminous material also is evenly distributed in the whole compound fully, no grey stone, no pitch agglomerate, pitch-black shinny in the compound.Add man-hour mixing and stirring, the reply batching plant constantly heats, mixture temperature when guaranteeing to produce.The mixture temperature of processed finished products should be not less than 165 ℃.
(5) lorry mounted mixer has storage bin equipment, and the bituminous mixture of mixing is discharged into lifting truck from mixing and stirring to irritate, and sends in the storage bin and keeps in, and then is discharged in the haul automobile again.
(6) bituminous mixture that mixes and stirs carries out tracking quality sampling observation, checks indexs such as aggregate grading, bitumen content, through sampling observation, gathers materials, bitumen content satisfies the match ratio designing requirement.
(7) adopt the batch (-type) mixing machine, the production time that the RS2000 compound is every jar is 60s.
2. the transportation of bituminous mixture
(1) transportation of bituminous mixture is adopted and is no less than 6 15t tipping truck transportations, in order to prevent the difficulty of unloading, at an amount of profit (1: the 3) mixture of railway carriage bottom brushing.Before the charging, drain ponding at the bottom of the truck, each truck all has a fluffy and insulation paulin of canvas, and its size covers whole railway carriage, is not subjected to rain or low temperature effect with the protection compound.
(2) before the construction all drivers are giveed training, strengthened the maintenance of automobile, avoid roadside breakdown in the haul way, cause the compound cooling impaired.The when filling with substance automobile according to forward and backward, in order move around, avoid mixture segregation; The haul automobile stops outside the 10-30cm before paver, and the haul automobile is hung neutral gear in the discharge process, promotes to advance by paver, to guarantee the planeness of paving layer.
(3) paver the place ahead has dumper waiting discharging in the work progress, and the dumper that waits discharging when beginning to pave at the construction field (site) is no less than 6, has guaranteed to pave continuously.The each discharging of dumper is all cleaned out hopper, prevents scleroma.
3. compound paves
(1) pave before the RS2000 modified asphalt mixture, spray the mulseal sticking layer oil earlier, spilling the cloth amount is 1.8kg/m
2
(2) paver in place and adjust finish after, at first carry out the preheating insulation work of paver and screed, the preheat temperature of screed and the temperature of bituminous mixture are approaching, the temperature of screed is not less than 80 ℃.Adopt two pavers to carry out echelon's operation, from the construction of K95+660 beginning full width, the temperature that paves is 150～170 ℃, and the speed of paving is 2m/min.In order to guarantee surface evenness, according to code requirement slowly, evenly, pave uninterruptedly, random conversion rate or stop in the paving process.Strict discharging speed according to lorry mounted mixer is controlled the speed that paves in paving process, and the speed that paves directly influences paving thickness, planeness.
(3) screed or leveling assembly pave effectively and provide the surface of required planeness and texture, and the surface does not tear, pushes compound or eyelet.
(4) paver adopts Automatic Levelling mode, balance beam type paving thickness control mode.
(5) evenly coat skim pitch on the contact surface of curb, Lu Gou, ponding well and other works, nestle up these contact surfaces bituminous mixture that paves then.
(6) check paving thickness and road camber, horizontal wall inscription in the paving process at any time, and check average thickness by pitch total amount of using and area according to the control of flexible pavement Quality Process and the total amount method of inspection.When paving, paving thickness should be design thickness and multiply by coefficient of loose laying 1.25.
(7) in paving process, the hopper feed mouth is opened fully, and the paver feeding screw gyrates, the speed equilibrium, and maintain the compound that is no less than feed appliance height 2/3, guarantee on paver full duration section, not emanate.
4. flexible pavement rolls and moulding
(1) first pressing
Adopt DYNAPAC CC422 shaped steel wheel vibratory roller to carry out first pressing, first pressing is carried out immediately following behind the paver, and rolling speed is not more than 2.5km/h.Roll and follow " high frequency, by a narrow margin, immediately following, press slowly " principle, roll in the process and carry out with keeping in balance.Roll temperature and be controlled at 130～150 ℃.
In the process of rolling, road roller rolls against road kerb, guarantees that limit portion is closely knit, and prevents that road kerb from destroying.
When the edge has baffle plate, road kerb, curb etc. to prop up retaining, roll near a retaining.When the edge does not have retaining, with rake the compound at edge is harrowed height slightly, roll more than then the outboard wheel of road roller being stretched out edge 10cm.
Check planeness, road camber after the first pressing, suitably repair in case of necessity.
Should be when rolling with driving wheel towards paver.Roll route and roll direction and do not answer flip-flop and cause compound produce to be passed.Road roller starts, stops and must deceleration slowly carrying out.
(2) the multiple pressure
Compress again to follow after first pressing and begin, carry out continuously.Adopt 25t, 27t pneumatic-tired rollers to roll the length 70～80m of the section of rolling.Rolling speed is 4km/h, and pass, has reached the degree of compaction that requires, and do not had remarkable wheelmark through check for being not less than 3 times.
(3) final pressure
Adopt the CC422 steel roller to carry out final pressure when closing vibration, final pressure rolls 2 times immediately following carrying out after multiple the pressure, and speed is 5km/m, to eliminate wheelmark, improves planeness.The pavement compaction finishing temperature is not less than 90 ℃.
(4) seam
Pave and adopt echelon's operation, vertical hot joining seam of generation will be spread part and stay that 100～200mm is wide wouldn't to roll, and as the datum of further part, stride seam then and will roll to eliminate and stitch mark.
Transverse joint adopts vertical flat seam.At the end of a period section shop skim sand that pave and finish every day, roll end after, planeness is checked that defective section should be cut and set up stubble, and cleaning is totally with the 3m ruler.The brushing sticking layer oil is also used the screed preheating before the transverse joint construction.Make before the new compound joint of making that to connect stubble softening, road roller laterally rolls earlier, becomes one at longitudinal rolling, fully rolls to become one.Handling the basic principle that laterally connects stubble well is, the end edge of the band that article one be paved is sawn into vertical plane, meets at right angles with longitudinal edge.
Claims (3)
1. anti-rutting road surface RS 2000 modified asphalt mixture proportioning and construction technology, anti-treadway payment are by hypothallus, surface layer, middle surface layer, upper layer constitute down, and wherein, upper layer adopts the RS2000 modified asphalt mixture,
The upper layer optimum gradation is: 11-16mm: 6-11mm: 3-6mm: 0-5mm: breeze=16: 30: 10: 43: 1, best RS2000 modified bitumen consumption is 4.8%, wherein, 11-16mm, 6-11mm, 3-6mm are the coarse aggregate specification, and 0-5mm is a fine aggregate size;
It is characterized in that middle surface layer also adopts the RS2000 modified asphalt mixture,
Middle surface layer optimum gradation is: 10-20mm: 5-10mm: 0-5mm: breeze=43: 29: 26: 2, and best RS2000 modified bitumen consumption is 4.3%, and wherein, 10-20mm: 5-10mm is the coarse aggregate specification, and 0-5mm is a fine aggregate size;
Construction Craft is:
(1) hypothallus, surface layer employing usual manner construction down;
When surface layer paved (2), temperature was not less than 155 ℃, and speed of application is 2-3m/min;
When (3) upper layer paved, temperature was not less than 160 ℃, and speed of application is 2-3m/min;
(4) first pressing, temperature are not less than 150 ℃, and speed of application is 2-3km/h;
(5) the multiple pressure, temperature is not less than 130 ℃, and speed of application is 3-5km/h;
(6) final pressure, temperature are not less than 90 ℃, and speed of application is 3-6km/h.
2. anti-rutting road surface RS 2000 modified asphalt mixture proportioning according to claim 1 and construction technology is characterized in that: the coarse aggregate in the upper layer adopts the diabase rubble, and fine aggregate adopts limestone, and breeze adopts Dean Wu Shan breeze.
3. anti-rutting road surface RS 2000 modified asphalt mixture proportioning according to claim 1 and construction technology is characterized in that: the coarse aggregate in the middle surface layer adopts limestone, and fine aggregate adopts limestone, and breeze adopts Dean Wu Shan breeze.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103774519B (en) * | 2011-12-31 | 2015-11-25 | 常熟古建园林建设集团有限公司 | Asphalt roads construction method |
| CN102733282A (en) * | 2012-06-07 | 2012-10-17 | 中铁四局集团第一工程有限公司 | Proportion and construction technology of AC modified asphalt mixture for subtropical anti-treadway pavement |
| CN103669153B (en) * | 2013-12-31 | 2016-08-17 | 山东卓洋机电科技有限公司 | Low temperature micro-surfacing construction technique |
| CN104631261B (en) * | 2015-02-17 | 2016-08-24 | 中交第一公路工程局有限公司 | A kind of cement stabilized macadam underlayment, go to a grassroots level and the construction method of three layers of upper basic unit even paving |
| CN105421182B (en) * | 2015-11-04 | 2017-06-16 | 湖州南浔交通水利投资建设有限公司 | A kind of building waste is used for asphalt proportion design method |
| CN105672080B (en) * | 2016-01-22 | 2017-03-15 | 交通运输部公路科学研究所 | A kind of Rut resistance pavement structure and its laying method |
| CN115058935A (en) * | 2022-07-01 | 2022-09-16 | 浙江威克赛新材料科技有限公司 | Construction method for modified Sup-25 asphalt concrete lower surface layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760452A (en) * | 2004-10-11 | 2006-04-19 | 上海诚建道路机械施工有限公司 | Technique for constructing asphalt concrete pavement of racetrack |
| CN201214748Y (en) * | 2008-06-04 | 2009-04-01 | 南通新建市政工程有限公司 | Highway pavement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760452A (en) * | 2004-10-11 | 2006-04-19 | 上海诚建道路机械施工有限公司 | Technique for constructing asphalt concrete pavement of racetrack |
| CN201214748Y (en) * | 2008-06-04 | 2009-04-01 | 南通新建市政工程有限公司 | Highway pavement |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2005-240441A 2005.09.08 |
| 谭生光.RS2000抗车辙改性沥青在昌九高速公路上的应用.公路交通科技.2008,(3),第42页至第44页、第48页及表4，7. * |
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