CN103255696B - The connection type graded broken stone mixture of a kind of Semi-Rigid Pavement Structure and use thereof - Google Patents
The connection type graded broken stone mixture of a kind of Semi-Rigid Pavement Structure and use thereof Download PDFInfo
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Abstract
The invention belongs to highway construction technical field, disclose the connection type graded broken stone mixture of a kind of Semi-Rigid Pavement Structure and use thereof.This Semi-Rigid Pavement Structure, comprises asphalt surface course and semi-steel basic unit, it is characterized in that, be equipped with graded broken stone layer between described asphalt surface course and semi-steel basic unit; Gathering materials for connection type limestone graded broken stone of described graded broken stone layer, cementing agent is pitch; Its graded broken stone layer connection type graded broken stone mixture used.
Description
Technical field
The invention belongs to 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, as most important Pavement Structures of High Type Highways form, has played important effect in highway construction.Semi-rigid base asphalt pavement structure, design of material method 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 stress strain response that is random, the change in irregular cycle, material is made to be subject to the effect of fatigue damage, when fatigue damage accumulative reaches the limit ability to bear of material, road structure inside just produces micro-mechanical model, along with the increase of action of traffic loading number of times, crackle will constantly be expanded, and finally form load effective width at road table.Particularly new highway does not generally reach the design period required by pavement design.A large amount of study and practice shows, the disease caused because of semi-rigid type base factor mainly contains: 1. reflection cracking in a pavement; 2. closely knit semi-rigid type base makes water rest on substrate top surface, forms flowing pressure under causing Vehicle Load, causes the washing away of basic unit, purt mud etc.; 3. semi-rigid pavement very easily occurs that early fatigue destroys under heavy duty, overload effect.
At present, to the major measure reducing semi-rigid pavement crack be both at home and abroad: 1. starting with from semi-rigid sub-base material itself prevents and reduce the reflection crack of semi-rigid asphalt pavement, as adjusted binder consumption and ratio, increase coarse aggregate content and strictly design grating, to reduce temperature contracting and drying shrinkage effect as much as possible, increase anti-cracking performance of semi-rigid base course energy.But this method still can not from the basic cracking eliminating semi-rigid sub-base material; 2. by increasing thickness of bituminous surface to prevent reflection crack; 3. start with from structure itself and prevent and reduce the reflection crack of Semi rigid bituminous surface basic unit.Between asphalt surface course and semi-steel basic unit, spread graded broken stone layer, disperse and slow down cracks in semi-rigid base course.
The measure in the above several minimizing semi-rigid pavement crack of contrast, first method fundamentally can not eliminate the cracking of semi-rigid sub-base material.Second method is unreasonable economically.The third method slow down in reflection crack, draining with the obvious advantage; But graded broken stone deck exists that intensity is low, permanent deformation is large, be open to traffic after easily cause the problem such as surface layer check crack and excessive rut, and graded broken stone roller compaction process easily loose not easily integrally, thus limit the application of graded broken stone in highway in China.Therefore, explore the rigidity that novel graded broken stone deck effectively can improve graded broken stone, thus reduce road surface deflection on the basis keeping original performance, meet construction workability simultaneously, become the key breakthrough point promoting that connection type graded broken stone is applied 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, thus reduce road surface deflection on the basis keeping original performance, meet construction workability simultaneously.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
(1) Semi-Rigid Pavement Structure, comprises asphalt surface course and semi-steel basic unit, it is characterized in that, be equipped with graded broken stone layer between described asphalt surface course and semi-steel basic unit; Gathering materials for connection type limestone graded broken stone of described graded broken stone layer, cementing agent is pitch.
Preferably, the grating of described connection type limestone graded broken stone is: particle diameter is less than and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Particle diameter is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Particle diameter is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Particle diameter is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Particle diameter is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Particle diameter is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Particle diameter is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass.
Preferably, the bitumen aggregate ratio as the pitch of cementing agent is 1.4%-2.6%.
(2) a connection type graded broken stone mixture, is characterized in that, comprises as the limestone gathered materials and the pitch as cementing agent; The grating of described connection type graded broken stone is: aggregate size is less than and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Aggregate size is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Aggregate size is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Aggregate size is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Aggregate size is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Aggregate size is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Aggregate size is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass; The bitumen aggregate ratio of the 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 have good pavement performance, according to experimental project testing result, the connection type graded broken stone mixture that the present invention proposes is easier to be compacted under effect of vibration.(2) the present invention's graded broken stone layer between asphalt surface course and semi-steel basic unit of adopting connection type graded broken stone mixture to lay, there is flexible intermediate layer performance, can with the best combination of semi-rigid type base, make it the advantage that can give full play to flexible pavement, semi-rigid type base defect can be made up again, improve road bearing capacity and increase the service life.(3) connection type graded broken stone and the graded broken stone results contrast under identical vibration moulding mode of the present invention's design is adopted, CBR intensity improves 10%-20%, unconfined compression strength can improve 115%-170%, and compound Marshall stability can reach more than 3kN simultaneously.Test section result shows to connect type graded broken stone for intermediate layer road structure, and its oeverall quality is better than original conventional pav structure, and Pavement Performance improves further.
Accompanying drawing explanation
Fig. 1 is the sectional schematic diagram of Semi-Rigid Pavement Structure of the present invention.
In figure: 1, asphalt surface course; 2, graded broken stone layer; 3, semi-steel basic unit.
Specific implementation method
Below by the drawings and specific embodiments, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
One, connection type graded broken stone mixture mix-design, its concrete steps are:
(1) raw material are selected:
Select rubble raw material: adopt limestone.In limestone, coarse aggregate has certain toughness, and the binding type of limestone and pitch is better, and the workability of construction is better, is easy to roller-compaction, should not emanates.Coarse aggregate technical data is as shown in table 1, and 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 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.Bitumen technology parameter is as shown in table 3.
Table 3 bitumen technology parameter list
(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 and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Aggregate size is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Aggregate size is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Aggregate size is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Aggregate size is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Aggregate size is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Aggregate size is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass.Gather materials screening result and formate gradation composition result as shown in table 1.
The screening of table 4 mineral aggregate and formate gradation composition result of calculation
(3) in the grating of step (2), add cementing agent gradually, two-sided hitting real carried out Mashell molding test for 50 times and is determined minimum consumption of binder, ensures that compound can be complete shaping and the minimum bitumen aggregate ratio of the demoulding is about between 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 affects pavement quality, and bitumen aggregate ratio is the easy bellding in road surface greatly then, otherwise then affects intensity and waterproof effect.
(4) bitumen aggregate ratio is that the pitch of 1.4%, 1.7%, 2.0%, 2.3% and 2.6% adds and gathers materials by grating in step (3) and minimum consumption of binder.Many groups connection type graded broken stone of system, carries out the shaping mensuration Marshall stability of marshal piece.Set up marshal piece and vibration moulding Sample density relation, by data analysis, when time of vibration is 75S, both density is close, therefore, adopts time of vibration to be 75S when carrying out analysis of experiments afterwards.
(5) time of vibration that step (4) gained many groups connection type graded broken stone mixture is determined according to step (5) is carried out vibration compaction test, under simulation research on vibrating compaction test mode, preparing many packet sizes is Φ 15cm × H15cm cylinder specimen, measures 45 DEG C 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 | Eccentric block angle | Exciting force | Still-pressure | Amplitude |
| 30HZ | 30° | 7615N | 140Kpa | 1.4mm |
(6) during design, the bitumen aggregate ratio a1 that 45 DEG C of test specimen CBR maximum values are corresponding can be adopted, the bitumen aggregate ratio a2 that 45 DEG C of unconfined compression strength maximum values are corresponding, the optimum oil-stone ratio calculating connection type graded broken stone mixture is taken as the average A1 of the two, i.e. A1=(a1+a2)/2.
In test example, bitumen aggregate ratio be 1.4%, 1.7%, 2.0%, 2.3% and 2.6% pitch add and gather materials, the graded broken stone layer of acquisition, its performance all meets 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) is prepared connection type graded broken stone cylinder specimen parameter and is: vibration frequency 30-40Hz, eccentric block angle 30 °, exciting force 7610-7650N, still-pressure 140-180KPa, amplitude 1.4-2.0mm, with marshal piece density for standard determination test specimen vibration moulding time 60-80s.
Two, Semi-Rigid Pavement Structure, as shown in Figure 1, is equipped with graded broken stone layer 2 between asphalt surface course 1 and semi-steel basic unit 3; Gathering materials for connection type limestone graded broken stone of its graded broken stone layer 2, cementing agent is pitch.
Wherein, the grating of connection type limestone graded broken stone is: particle diameter is less than and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Particle diameter is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Particle diameter is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Particle diameter is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Particle diameter is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Particle diameter is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Particle diameter is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass.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 paved roads test section, result shows, to connect type graded broken stone layer for intermediate layer road structure, its oeverall quality is better than original conventional pav structure, and Pavement Performance is further enhanced.
Claims (3)
1. a Semi-Rigid Pavement Structure, comprises asphalt surface course and semi-steel basic unit, it is characterized in that, be equipped with graded broken stone layer between described asphalt surface course and semi-steel basic unit; Gathering materials for connection type limestone graded broken stone of described graded broken stone layer, cementing agent is pitch;
The grating of described connection type limestone graded broken stone is: particle diameter is less than and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Particle diameter is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Particle diameter is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Particle diameter is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Particle diameter is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Particle diameter is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Particle diameter is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass.
2. Semi-Rigid Pavement Structure according to claim 1, is characterized in that, the bitumen aggregate ratio as the pitch of cementing agent is 1.4%-2.6%.
3. a connection type graded broken stone mixture, is characterized in that, comprises as the limestone gathered materials and the pitch as cementing agent; The grating of described connection type graded broken stone is: aggregate size is less than and gathering materials of 26.5mm accounts for grating and to gather materials 100% of gross mass; Aggregate size is less than and gathering materials of 16mm accounts for grating and to gather materials the 75%-95% of gross mass; Aggregate size is less than and gathering materials of 9.5mm accounts for grating and to gather materials the 48%-64% of gross mass; Aggregate size is less than and gathering materials of 4.75mm accounts for grating and to gather materials the 30%-38% of gross mass; Aggregate size is less than and gathering materials of 2.36mm accounts for grating and to gather materials the 14%-24% of gross mass; Aggregate size is less than and gathering materials of 0.6mm accounts for grating and to gather materials the 5%-15% of gross mass; Aggregate size is less than and gathering materials of 0.075mm accounts for grating and to gather materials the 0%-5% of gross mass; The bitumen aggregate ratio of the described pitch as cementing agent is 1.4%-2.6%.
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| CN103669154B (en) * | 2013-12-06 | 2016-04-13 | 长沙理工大学 | The durable asphalt pavement method for designing that a kind of deck life-span successively increases progressively |
| 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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