CN103255696A - Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure - Google Patents
Semi-rigid pavement structure and joint type graded broken stone mixture used in semi-rigid pavement structure Download PDFInfo
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Abstract
The invention belongs to the technical field of road engineering and discloses a semi-rigid pavement structure and a joint type graded broken stone mixture used in the semi-rigid pavement structure. The semi-rigid pavement structure comprises an asphalt surface layer and a semi-rigid base layer, and is characterized in that a graded broken stone layer is laid between the asphalt surface layer and the semi-rigid base layer, aggregate of the graded broken stone layer is joint type limestone graded broken stones, a binding agent is asphalt, and the used graded broken stone layer is the joint type graded broken stone mixture.
Description
Technical field
The invention belongs to the highway construction technical field, relate to the connection type graded broken stone mixture of a kind of Semi-Rigid Pavement Structure and use thereof.
Background technology
Semi-rigid pavement has been brought into play important effect as most important Pavement Structures of High Type Highways form in highway construction.Semi-rigid asphalt pavement structure, material method for designing and construction technique normalizing are gradually improved.But in use semi-rigid asphalt pavement also progressively shows some serious problems.Under the repeat function of traffic loading, semi-rigid type base will produce ess-strain response at random, that be variation irregular cycle, make material be subjected to the effect of fatigue damage, when the accumulative total of fatigue damage reaches the limit ability to bear of material, road structure inside just produces thin sight crackle, along with the increase of action of traffic loading number of times, crackle will constantly be expanded, and finally form load type reflection crack at the road table.Particularly newly-built highway does not generally reach pavement design desired design period.A large amount of application with studies show that the disease that causes because of the semi-rigid type base factor mainly contains: 1. road reflection crack; 2. closely knit semi-rigid type base makes water rest on basic unit's end face, causes forming flowing pressure under the vehicular load effect, causes the washing away of basic unit, purt mud etc.; 3. early fatigue destruction very easily appears in semi-rigid pavement under heavy duty, overload effect.
At present, both at home and abroad to the major measure that reduces the semi-rigid pavement crack be: the 1. reflection crack of starting with and preventing and reduce semi-rigid asphalt pavement from semi-rigid sub-base material itself, as adjust binder consumption and ratio, increase coarse aggregate content and strict design grating, in order to reduce temperature contracting and drying shrinkage effect as much as possible, increase the anti-cracking performance of semi-rigid base course energy.But this method still can not be from the cracking of basic elimination semi-rigid sub-base material; 2. by increasing thickness of bituminous surface to prevent the base course reflection crack; 3. the reflection crack of starting with and preventing and reduce semi-rigidity bituminous sub-surface from structure itself.Shop graded broken stone layer between asphalt surface course and half steel basic unit disperses and slows down the semi-rigid type base crack.
The measure in the above several minimizing semi-rigid pavements crack of contrast, first method can not fundamentally be eliminated the cracking of semi-rigid sub-base material.Second method is unreasonable economically.The third method slow down aspect reflection crack, the draining with the obvious advantage; But the graded broken stone deck exists that intensity is low, permanent deformation is big, cause surface layer check crack and excessive problems such as rut easily after being open to traffic, and graded broken stone roll process easily loose be difficult for into whole, thereby limited the application of graded broken stone in highway in China.Therefore, explore the rigidity that novel graded broken stone deck can effectively improve graded broken stone, thereby reduce road table flexure on the basis that keeps original performance, satisfy construction workability simultaneously, become and promote connection type graded broken stone key in application break-through point in highway.
Summary of the invention
The object of the invention is to provide a kind of Semi-Rigid Pavement Structure, adopts connection type graded broken stone layer, effectively improves the rigidity of graded broken stone, thereby reduces road table flexure on the basis that keeps original performance, satisfies construction workability simultaneously.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
(1) a kind of Semi-Rigid Pavement Structure comprises asphalt surface course and half steel basic unit, it is characterized in that, is equipped with the graded broken stone layer between described asphalt surface course and the half steel basic unit; Gathering materials of described graded broken stone layer is connection type limestone graded broken stone, and cementing agent is pitch.
Preferably, the grating of described connection type limestone graded broken stone is: particle diameter is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Particle diameter is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Particle diameter is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Particle diameter is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Particle diameter is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Particle diameter is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Particle diameter is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm.
Preferably, the bitumen aggregate ratio as the pitch of cementing agent is 1.4%-2.6%.
(2) a kind of connection type graded broken stone mixture is characterized in that, comprises as the limestone that gathers materials with as the pitch of cementing agent; The grating of described connection type graded broken stone is: aggregate size is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Aggregate size is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Aggregate size is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Aggregate size is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Aggregate size is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Aggregate size is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Aggregate size is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm; The bitumen aggregate ratio of described pitch as cementing agent is 1.4%-2.6%.
Advantage of the present invention and beneficial effect are: (1) adopts connection type graded broken stone mixture of the present invention to can be applicable to site operation, and good pavement performance is arranged, according to the experimental project testing result, the connection type graded broken stone mixture that the present invention proposes is easier to be compacted under the vibration effect.(2) the present invention adopts the graded broken stone layer between asphalt surface course and half steel basic unit that connection type graded broken stone mixture is laid, has the flexible intermediate layer performance, can with the best combination of semi-rigid type base, make it to give full play to the advantage of flexible pavement, can remedy the semi-rigid type base defective again, improve the road bearing capacity and increase the service life.(3) graded broken stone result comparison under the connection type graded broken stone that adopts the present invention's design and the identical vibration moulding mode, CBR intensity improves 10%-20%, unconfined compression strength can improve 115%-170%, and the compound Marshall stability can reach more than the 3kN simultaneously.It is the intermediate layer road structure that the test section result shows to connect the type graded broken stone, and its oeverall quality is better than original traditional road structure, and Pavement Performance further improves.
Description of drawings
Fig. 1 is the sectional schematic diagram of Semi-Rigid Pavement Structure of the present invention.
Among the figure: 1, asphalt surface course; 2, graded broken stone layer; 3, half steel basic unit.
Specific implementation method
The invention will be further described below by the drawings and specific embodiments, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
One, the design of connection type graded broken stone mixture match ratio, its concrete steps are:
(1) raw material are selected:
Select the rubble raw material: adopt limestone.Coarse aggregate has certain toughness in the limestone, and the binding type of limestone and pitch is better, and the workability of construction is better, is easy to roller-compaction, should not emanate.The coarse aggregate technical data is as shown in table 1, and the fine aggregate technical data is as shown in table 2.
Table 1 coarse aggregate technical data table
Table 2 fine aggregate technical data table
Select the cementing agent raw material: the cementing agent of connection type graded broken stone mixture adopts No. 90 A level bi tumenf orr oads, and the place of production is Karamay oilfield.The pitch technical data is as shown in table 3.
Table 3 pitch technical data table
(2) the connection type graded broken stone of configuration optimization:
The grating of the connection type graded broken stone of this optimization is: aggregate size is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Aggregate size is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Aggregate size is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Aggregate size is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Aggregate size is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Aggregate size is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Aggregate size is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm.Screening result and the formate gradation composition result of gathering materials is as shown in table 1.
The screening of table 4 mineral aggregate and formate gradation composition result of calculation
(3) add cementing agent gradually in the grating of step (2), two-sided hitting real carried out Marshall moulding test 50 times and determined minimum cementing agent consumption, guarantee compound can complete moulding and the minimum bitumen aggregate ratio of the demoulding be about between the 1.2%-1.5%; Preferred minimum bitumen aggregate ratio gets 1.4%.Bitumen aggregate ratio refers to the percentage of pitch and aggregate quality ratio, and it is one of index of asphalt content.Its consumption height directly influences pavement quality, and bitumen aggregate ratio is the easy bellding in road surface greatly then, otherwise then influences intensity and waterproof effect.
(4) grating in step (3) and minimum cementing agent consumption are that 1.4%, 1.7%, 2.0%, 2.3% and 2.6% pitch adds and to gather materials with bitumen aggregate ratio.Many groups connection type graded broken stone of system carries out the marshal piece moulding and measures Marshall stability.Set up marshal piece and vibration moulding test specimen density relationship, by data analysis, when time of vibration was 75S, both density approached, and therefore, adopting time of vibration when carrying out analysis of experiments afterwards is 75S.
(5) step (4) gained is organized connection type graded broken stone mixture more and carried out vibration compaction test according to the definite time of vibration of step (5), under the simulation research on vibrating compaction test mode, preparing many packet sizes is Φ 15cm * H15cm cylinder specimen, measures 45 ℃ of test specimen CBR and unconfined compression strength.Vibration compaction test machine parameter is as shown in table 5.
Table 5 gathers materials and sieves and formate gradation composition result of calculation
| Vibration frequency | The eccentric block angle | Exciting force | Quiet surface pressure | Amplitude |
| 30HZ | 30° | 7615N | 140Kpa | 1.4mm |
When (6) designing, can adopt the bitumen aggregate ratio a1 of 45 ℃ of test specimen CBR maximum value correspondences, the bitumen aggregate ratio a2 of 45 ℃ of unconfined compression strength maximum value correspondences, the best bitumen aggregate ratio that calculates connection type graded broken stone mixture is taken as the average A1 of the two, i.e. A1=(a1+a2)/2.
In the test example, bitumen aggregate ratio is during the adding of 1.4%, 1.7%, 2.0%, 2.3% and 2.6% pitch is gathered materials, the graded broken stone layer of acquisition, and its performance all satisfies the technical requirements of table 6.
The technical requirements of table 6 connection type graded broken stone layer
In a word, the vibration moulding test method(s) of employing step (5) prepares connection type graded broken stone cylinder specimen parameter and is: vibration frequency 30-40Hz, 30 ° of eccentric block angles, exciting force 7610-7650N, quiet surface pressure 140-180KPa, amplitude 1.4-2.0mm is that standard is determined test specimen vibration moulding time 60-80s with marshal piece density.
Two, Semi-Rigid Pavement Structure as shown in Figure 1, is equipped with graded broken stone layer 2 between asphalt surface course 1 and half steel basic unit 3; Gathering materials of its graded broken stone layer 2 is connection type limestone graded broken stone, and cementing agent is pitch.
The grating of wherein, connection type limestone graded broken stone is: particle diameter is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Particle diameter is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Particle diameter is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Particle diameter is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Particle diameter is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Particle diameter is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Particle diameter is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm.Wherein, the bitumen aggregate ratio as the pitch of cementing agent is 1.4%-2.6%.
According to above-mentioned Semi-Rigid Pavement Structure, use connection type graded broken stone mixture making actual road test section, the result shows, is the intermediate layer road structure with connection type graded broken stone layer, its oeverall quality is better than original traditional road structure, and Pavement Performance is further enhanced.
Claims (4)
1. a Semi-Rigid Pavement Structure comprises asphalt surface course and half steel basic unit, it is characterized in that, is equipped with the graded broken stone layer between described asphalt surface course and the half steel basic unit; Gathering materials of described graded broken stone layer is connection type limestone graded broken stone, and cementing agent is pitch.
2. Semi-Rigid Pavement Structure according to claim 1 is characterized in that, the grating of described connection type limestone graded broken stone is: particle diameter is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Particle diameter is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Particle diameter is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Particle diameter is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Particle diameter is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Particle diameter is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Particle diameter is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm.
3. Semi-Rigid Pavement Structure according to claim 1 is characterized in that, is 1.4%-2.6% as the bitumen aggregate ratio of the pitch of cementing agent.
4. a connection type graded broken stone mixture is characterized in that, comprises as the limestone that gathers materials with as the pitch of cementing agent; The grating of described connection type graded broken stone is: aggregate size is less than accounting for grating 100% of the gross mass of gathering materials gathering materials of 26.5mm; Aggregate size is less than accounting for the gather materials 75%-95% of gross mass of grating gathering materials of 16mm; Aggregate size is less than accounting for the gather materials 48%-64% of gross mass of grating gathering materials of 9.5mm; Aggregate size is less than accounting for the gather materials 30%-38% of gross mass of grating gathering materials of 4.75mm; Aggregate size is less than accounting for the gather materials 14%-24% of gross mass of grating gathering materials of 2.36mm; Aggregate size is less than accounting for the gather materials 5%-15% of gross mass of grating gathering materials of 0.6mm; Aggregate size is less than accounting for the gather materials 0%-5% of gross mass of grating gathering materials of 0.075mm; The bitumen aggregate ratio of described pitch as cementing agent is 1.4%-2.6%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103669154A (en) * | 2013-12-06 | 2014-03-26 | 长沙理工大学 | Design method for durable bituminous pavement with layer-by-layer progressively-increased structural layer life |
| CN104652211A (en) * | 2015-01-20 | 2015-05-27 | 四川公路桥梁建设集团有限公司 | Novel road surface mixture of stably-gradated broken-stone cushion layer doped with fine limestone aggregates |
| CN105442402A (en) * | 2015-11-09 | 2016-03-30 | 四川公路桥梁建设集团有限公司 | Stabilized graded broken stone hardcore doped with recycled powder |
| CN105648865A (en) * | 2016-02-02 | 2016-06-08 | 上海建工集团股份有限公司 | Paving method for tropical zone road surface |
| CN106966639A (en) * | 2017-04-13 | 2017-07-21 | 长安大学 | A kind of poor asphalt macadam transition zone compound and semi-rigid asphalt pavement |
| CN111501512A (en) * | 2020-04-30 | 2020-08-07 | 镇江港务集团有限公司 | Multi-stage rubblization construction method for road surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669154A (en) * | 2013-12-06 | 2014-03-26 | 长沙理工大学 | Design method for durable bituminous pavement with layer-by-layer progressively-increased structural layer life |
| CN104652211A (en) * | 2015-01-20 | 2015-05-27 | 四川公路桥梁建设集团有限公司 | Novel road surface mixture of stably-gradated broken-stone cushion layer doped with fine limestone aggregates |
| CN105442402A (en) * | 2015-11-09 | 2016-03-30 | 四川公路桥梁建设集团有限公司 | Stabilized graded broken stone hardcore doped with recycled powder |
| CN105648865A (en) * | 2016-02-02 | 2016-06-08 | 上海建工集团股份有限公司 | Paving method for tropical zone road surface |
| CN106966639A (en) * | 2017-04-13 | 2017-07-21 | 长安大学 | A kind of poor asphalt macadam transition zone compound and semi-rigid asphalt pavement |
| CN111501512A (en) * | 2020-04-30 | 2020-08-07 | 镇江港务集团有限公司 | Multi-stage rubblization construction method for road surface |
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