CN107761502A - A kind of Perpetual Pavements Structural - Google Patents
A kind of Perpetual Pavements Structural Download PDFInfo
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- CN107761502A CN107761502A CN201711074865.2A CN201711074865A CN107761502A CN 107761502 A CN107761502 A CN 107761502A CN 201711074865 A CN201711074865 A CN 201711074865A CN 107761502 A CN107761502 A CN 107761502A
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Abstract
The present invention discloses a kind of Perpetual Pavements Structural being layed in above soil matrix, including asphalt surface course (1), basic unit (2) and underlayment (3), asphalt surface course (1) includes surface abrasion layer (11), middle surface layer (12) and cutting optimal (13), surface abrasion layer (11) uses the grading asphalts of SMA 13, middle surface layer (12) uses the grading asphalts of Superpave 20, and cutting optimal uses the grading asphalts (13) of Superpave 25；Basic unit (2) is the hard and soft combined base of crack resistance, including basic unit in flexibility (21) and semi-rigid go to a grassroots level (22), basic unit (21) uses the Asphalt Stabilized Macadams of ATB 25 in flexibility, and semi-rigid go to a grassroots level (22) are cement stabilized granular；Underlayment (3) is Stabilized soil.The Perpetual Pavements Structural of the present invention, pavement quality can be greatly improved, extend Road Service Life.
Description
Technical field
The invention belongs to Flexible Pavement Structure technical field, particularly one kind slow down fatigue cracking caused by bituminous paving and
Basic unit passes to the reflection crack of asphalt surface course, avoids the occurrence of the Perpetual Pavements Structural of reflection crack.
Background technology
Existing high-grade highway generally use bituminous paving.Bituminous paving is layed in above soil matrix, and its structure generally includes
From asphalt surface course, basic unit and the underlayment set gradually downwardly over.
The structure of existing bituminous paving such as Chinese invention patent " low cost environment-protecting long-life orders pavement structure " (application number：
201611085143.2 the applying date：2016.1130) it is described, including superficial layer, upper sealing, middle surface layer, adhesion coating, cutting optimal, under
Sealing, semi-rigid type base and gravel-sorted subbase.
Semi-rigid type base is used in above-mentioned patent, while semi-rigid type base has many advantages, draining be present not
The defects of good, reflection crack.
Such structure make it that existing bituminous paving easily produces fatigue cracking and basic unit passes to the reflection of asphalt surface course and split
Seam, pavement quality is not high enough, and Road Service Life falls short of so that bituminous paving often just produces serious in the short period of time
Destruction, such as crack, Moisture Damage, rut, be far from the design period for reaching road.
And single flexbile base has larger deformation, the destruction of its own mainly under course under cyclic loading, when
The defects of accumulative residual deformation reaches certain value, and road surface can produce depression or rut.
The content of the invention
It is an object of the invention to provide a kind of Perpetual Pavements Structural, slows down fatigue cracking caused by bituminous paving
The transmitting crack of asphalt surface course is passed to basic unit, avoids the occurrence of reflection crack, initial outlay increase is reasonable, greatly improves road surface matter
Amount, extend Road Service Life.
The technical solution adopted by the present invention is：
A kind of Perpetual Pavements Structural, it is layed in above soil matrix, including the asphalt surface course set gradually down above certainly
1st, basic unit 2 and underlayment 3, the asphalt surface course 1 include surface abrasion layer 11, middle surface layer 12 and cutting optimal 13, the surface mill
Consume layer 11 and use SMA-13 grading asphalts, the middle surface layer 12 uses Superpave-20 grading asphalts, institute
State cutting optimal and use Superpave-25 gradings asphalt 13；The basic unit 2 is the hard and soft combined base of crack resistance, including soft
Xing Shang basic units 21 and it is semi-rigid go to a grassroots level 22, the flexible upper basic unit 21 uses ATB-25 Asphalt Stabilized Macadams, described semi-rigid
Go to a grassroots level 22 is cement stabilized granular；The underlayment 3 is Stabilized soil.
Compared with prior art, its remarkable advantage is the present invention：
1st, antifatigue cracking：The main reason for early crack is that bituminous paving fatigue behaviour is insufficient, the mistake under fully loaded transportation condition
Early generation crack, other diseases such as Moisture Damage are further formed, are mixed in framework compact type grading SMA-13 asphalts
Basalt fibre is added to improve its fatigue life；High temperature rutting deformation disease mainly occurs for the middle surface layer of asphalt pavement structure,
Basalt fibre is filled in Superpave-20 grading asphalts and improves its high-temperature stability, antifatigue cracking performance shows
Write；
2nd, reflection crack is avoided the occurrence of：Flexbile base is arranged on the larger semi-rigid type base of rigidity, due to half just
The deformation of property basic unit is smaller, the deformation to flexbile base serves effect of contraction, while passes through the adjustment of grading, construction technology
Improve etc., enable the larger increase of its intensive parameter, then the stress distribution of pavement structure, stress etc. and traditional flexbile base
Structural stress state is different, effectively prevents the generation of reflection crack, solves the problems such as impeded drainage.
In a word, the present invention can greatly improve pavement quality, extend Road Service Life by rationally increasing initial outlay.
The present invention is elaborated with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is the structural representation of Perpetual Pavements Structural of the present invention.
In figure, 1 asphalt surface course, 2 basic units, 3 underlayments, 11 surface abrasion layers, surface layer in 12,13 cutting optimals,
21 flexible upper basic units, 22 semi-rigid go to a grassroots level.
Embodiment
As shown in figure 1, Perpetual Pavements Structural of the present invention, is layed in above soil matrix, including oneself sets successively under above
Asphalt surface course 1, basic unit 2 and the underlayment 3 put；
The asphalt surface course 1 includes surface abrasion layer 11, middle surface layer 12 and cutting optimal 13, and the surface abrasion layer 11 uses
SMA-13 grading asphalts, the middle surface layer 12 use Superpave-20 grading asphalts, and the cutting optimal is adopted
With Superpave-25 gradings asphalt 13；
The basic unit 2 is the hard and soft combined base of crack resistance, including in flexibility basic unit 21 and it is semi-rigid go to a grassroots level 22, it is described soft
Xing Shang basic units 21 use ATB-25 Asphalt Stabilized Macadams, and semi-rigid go to a grassroots level 22 is cement stabilized granular；
The underlayment 3 is Stabilized soil.
Preferably, the thickness of the surface abrasion layer 11 is 50~70mm, the thickness of the middle surface layer 12 for 70~
100mm, the thickness of the cutting optimal 13 is 100~130mm, and the thickness of the anti-flexible upper basic unit 21 is 100~150mm, institute
It is 200~300mm to state semi-rigid 22 thickness of going to a grassroots level.
Preferably, the composition for the SMA-13 grading asphalts that the surface abrasion layer 11 uses and mass ratio for：
SBS modified pitch：First mineral aggregate：Basalt fibre=5.8~6.0：100：0.3~0.4, nominal maximum particle diameter chi
Very little is 13.2mm.
Preferably, the basalt fibre is in golden brown or dark brown, surface is smooth straight, pollution-free, and fiber is chopped public
Length is referred to as 5~15mm, and individual fiber diameter is 9~25 μm, and the nominal length deviation of basalt fibre should be controlled in factory
Within ± the 10% of value relative quantity processed, 2.60~2.80g/cm3 of density, fracture strength >=1200MPa, modulus of elasticity >=
7500MPa, elongation at break≤3.1%, oil absorbency >=50%, contain combustible 0.1%~1.0%.
Preferably, first mineral aggregate includes account for mineral aggregate gross mass 41%, 32%, 0%, 20% and 7% respectively No. 1
Material, No. 2 material, No. 3 material, No. 4 material and miberal powder, No. 1 material, No. 2 material and No. 3 material be basalt, expect to be limestone for No. 4, miberal powder
For levigate limestone.
Preferably, the composition for the Superpave-20 grading asphalts that the middle surface layer 12 uses and mass ratio for：
SBS modified pitch：Second mineral aggregate：Basalt fibre=4.2~4.4：100：0.2~0.3, nominal maximum particle diameter chi
Very little is 19.0mm.
Preferably, second mineral aggregate includes account for mineral aggregate gross mass 22%, 39%, 13%, 25% and 1% respectively No. 1
Material, No. 2 material, No. 3 material, No. 4 material and miberal powder；No. 1 material, No. 2 material and No. 4 material be limestone, expect to be basalt for No. 3, miberal powder
For levigate limestone.
Preferably, the composition for the Superpave-25 grading asphalts that the cutting optimal uses and mass ratio for：
SBS modified pitch：3rd mineral aggregate：Basalt fibre=4.1~4.3：100：0.3~0.4, nominal maximum particle diameter chi
Very little is 26.5mm.
Preferably, the 3rd mineral aggregate includes account for mineral aggregate gross mass 30%, 35%, 14%, 18% and 3% respectively No. 1
Material, No. 2 material, No. 3 material, No. 4 material and miberal powder；No. 1 material, No. 2 material and No. 4 material be limestone, expect to be basalt for No. 3, miberal powder
For levigate limestone.
Preferably, the nominal maximum particle diameter size for the ATB-25 Asphalt Stabilized Macadams that the flexible upper basic unit 21 uses for
26.5mm。
To verify effectiveness of the invention, further illustrated below with embodiment.
Embodiment 1
A kind of Perpetual Pavements Structural as shown in Figure 1,
The asphalt pavement structure includes asphalt surface course, the hard and soft combined base of crack resistance and underlayment successively from top to bottom；Its
In, asphalt surface course includes surface abrasion layer, middle surface layer and cutting optimal；Basic unit uses Asphalt Stabilized Macadam in flexibility, under semi-rigid
Basic unit is cement stabilized granular；Underlayment is Stabilized soil.
Wherein, surface wearing course uses SMA-13 grading asphalts, and thickness is 50~70mm, quality of materials ratio
For：SBS modified pitch：The first mineral aggregate：Basalt fibre=5.8~6.0:100:0.3~0.4, nominal maximum particle diameter size
For 13.2mm.
Wherein, middle surface layer uses Superpave-20 grading asphalts, and thickness is 70~100mm, quality of materials ratio
For：SBS modified pitch：Second of mineral aggregate：Basalt fibre=4.2~4.4:100:0.2~0.3, nominal maximum particle diameter size
For 19.0mm.
Wherein, cutting optimal uses Superpave-25 grading asphalts, and thickness is 100~130mm, quality of materials ratio
For：SBS modified pitch：The third mineral aggregate：Basalt fibre=4.1~4.3:100:0.3~0.4, nominal maximum particle diameter size
For 26.5mm.
Wherein, basic unit is ATB-25 Asphalt Stabilized Macadams in flexibility, and thickness is 100~150mm, nominal maximum particle diameter size
For 26.5mm.
Wherein, semi-rigid go to a grassroots level as cement stabilized granular, thickness is 200~300mm.
Wherein, basalt fibre in golden brown or dark brown, surface is smooth straight, pollution-free, fiber is chopped nominal length
For 5~15mm, individual fiber diameter is 9~25 μm, and the nominal length deviation of basalt fibre should be in institute of factory controlling value phase
Within ± the 10% of amount, 2.60~2.80g/cm3 of density, fracture strength >=1200MPa, modulus of elasticity >=7500MPa, fracture
Elongation≤3.1%, oil absorbency >=50%, containing combustible 0.1%~1.0%, moisture content≤0.2%, appearance yield >=
90, heat resistance, breaking strength retention >=85%, alkali resistance, breaking strength retention >=75%.
Contrast test is carried out for China's semi-rigid base asphalt pavement structure pavement structure corresponding with proposition of the invention
Research, analysis two kinds of conventional pavement structure materials and Perpetual Pavements Structural under different microstrains (450 microstrains, 650
Microstrain, 850 microstrains) contrast, for ease of comparing the difference of pavement structure material property, each structure sheaf takes identical thick
Degree, embody the ability of asphalt pavement structure high fatigue life of the embodiment of the present invention.
The asphalt pavement structure scheme of table 1
Show in asphalt surface course structure that middle cutting optimal is anti-fatigue layer through consulting literatures and practical experience, therefore main centering
Cutting optimal fatigue behaviour is studied.Using four-point bending fatigue test centering surface material Superpave-20 asphalts, under
Surface material Superpave-25 fatigue performance of asphalt mixture is evaluated, and result of the test is shown in Table 2.
The different type asphalt mixture fatigue testing result of table 2
As can be seen from the table, different pitches compound it is differently strained it is horizontal under fatigue life change, with should
The raising fatigue life for becoming horizontal reduces.And it was found that mix the asphalt fatigue effect number of basalt fibre apparently higher than
The blue or green compound of basalt fibre is not mixed.
Under the conditions of 450 microstrains, the asphalt fatigue life for mixing basalt fibre is other two kinds of pitch mixing
6~9 times of material.
Under the conditions of 650 microstrains, the asphalt fatigue life for mixing basalt fibre is other two kinds of pitch mixing
5~8 times of material
Under the conditions of 850 microstrains, the asphalt fatigue life for mixing basalt fibre is other two kinds of pitch mixing
2~3 times of material.
To sum up, a kind of Perpetual Pavements Structural asphalt of the present invention bears extraneous vehicular load repeat function
When, because basalt fibre is dispersed in asphalt, into three dimensions net distribution, and this space net structure can pass
Pass stress and offset corresponding stress, caking property well is formed between fiber and asphalt mastic, weaken relative between aggregate particle
Reinforcement is played a part of in displacement, so as to slow down the generation of crackle, improves its fatigue life, extends Road Service Life
Example provided above the present invention is described in detail introduction, but real the invention is not restricted to above-mentioned specific implementation
Example, all any changes or modifications done based on the present invention belong to the scope of protection of present invention.
Claims (10)
1. a kind of Perpetual Pavements Structural, it is layed in above soil matrix, including the asphalt surface course set gradually down above certainly
(1), basic unit (2) and underlayment (3), it is characterised in that：
The asphalt surface course (1) includes surface abrasion layer (11), middle surface layer (12) and cutting optimal (13), the surface abrasion layer
(11) SMA-13 grading asphalts are used, the middle surface layer (12) uses Superpave-20 grading asphalts, institute
State cutting optimal and use Superpave-25 gradings asphalt (13)；
The basic unit (2) is the hard and soft combined base of crack resistance, including in flexibility basic unit (21) and it is semi-rigid go to a grassroots level (22), it is described
Basic unit (21) uses ATB-25 Asphalt Stabilized Macadams in flexibility, and described semi-rigid go to a grassroots level (22) are cement stabilized granular；
The underlayment (3) is Stabilized soil.
2. Perpetual Pavements Structural according to claim 1, it is characterised in that：
The thickness of the surface abrasion layer (11) is 50~70mm, and the thickness of the middle surface layer (12) is 70~100mm, under described
The thickness of surface layer (13) is 100~130mm, and the thickness of the anti-flexible upper basic unit (21) is 100~150mm, described semi-rigid
The thickness of (22) of going to a grassroots level is 200~300mm.
3. Perpetual Pavements Structural according to claim 1 or 2, it is characterised in that the surface abrasion layer (11)
The composition and mass ratio of the SMA-13 grading asphalts used for：
SBS modified pitch：First mineral aggregate：Basalt fibre=5.8~6.0：100：0.3~0.4, nominal maximum particle diameter size is
13.2mm。
4. Perpetual Pavements Structural according to claim 3, it is characterised in that：
The basalt fibre in golden brown or dark brown, surface is smooth straight, pollution-free, fiber be chopped nominal length be 5~
15mm, individual fiber diameter are 9~25 μm, and the nominal length deviation of basalt fibre should be in institute of factory controlling value relative quantity
Within ± 10%, 2.60~2.80g/cm3 of density, fracture strength >=1200MPa, modulus of elasticity >=7500MPa, elongation at break
≤ 3.1%, oil absorbency >=50%, contain combustible 0.1%~1.0%.
5. Perpetual Pavements Structural according to claim 3, it is characterised in that：
First mineral aggregate include accounting for respectively No. 1 of mineral aggregate gross mass 41%, 32%, 0%, 20% and 7% material, No. 2 material, No. 3
Material, No. 4 material and miberal powder, No. 1 material, No. 2 material and No. 3 material are basalt, and No. 4 material are limestone, and miberal powder is levigate lime
Rock.
6. Perpetual Pavements Structural according to claim 1 or 2, it is characterised in that the middle surface layer (12) uses
Superpave-20 grading asphalts composition and mass ratio be：
SBS modified pitch：Second mineral aggregate：Basalt fibre=4.2~4.4：100：0.2~0.3, nominal maximum particle diameter size is
19.0mm。
7. Perpetual Pavements Structural according to claim 6, it is characterised in that：
Second mineral aggregate include accounting for respectively No. 1 of mineral aggregate gross mass 22%, 39%, 13%, 25% and 1% material, No. 2 material, No. 3
Material, No. 4 material and miberal powder；No. 1 material, No. 2 material and No. 4 material are limestone, and No. 3 material are basalt, and miberal powder is levigate lime
Rock.
8. Perpetual Pavements Structural according to claim 1 or 2, it is characterised in that what the cutting optimal used
The composition and mass ratio of Superpave-25 grading asphalts be：
SBS modified pitch：3rd mineral aggregate：Basalt fibre=4.1~4.3：100：0.3~0.4, nominal maximum particle diameter size is
26.5mm。
9. Perpetual Pavements Structural according to claim 8, it is characterised in that：
3rd mineral aggregate include accounting for respectively No. 1 of mineral aggregate gross mass 30%, 35%, 14%, 18% and 3% material, No. 2 material, No. 3
Material, No. 4 material and miberal powder；No. 1 material, No. 2 material and No. 4 material are limestone, and No. 3 material are basalt, and miberal powder is levigate lime
Rock.
10. Perpetual Pavements Structural according to claim 1 or 2, it is characterised in that：
The nominal maximum particle diameter size for the ATB-25 Asphalt Stabilized Macadams that the flexible upper basic unit (21) uses is 26.5mm.
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| CN201711074865.2A CN107761502A (en) | 2017-11-06 | 2017-11-06 | A kind of Perpetual Pavements Structural |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537388A (en) * | 2018-11-30 | 2019-03-29 | 长安大学 | Suitable for cold district semi-rigid type base anti-crack road surface structure and construction method |
| CN110080059A (en) * | 2019-06-12 | 2019-08-02 | 吉林省交通规划设计院 | A kind of pavement structure for freeway toll station square |
| CN110714386A (en) * | 2019-11-11 | 2020-01-21 | 上海市市政规划设计研究院有限公司 | Long-life semi-flexible base pavement structure and construction method thereof |
| CN112376349A (en) * | 2020-11-24 | 2021-02-19 | 东南大学 | Long-life flexible base asphalt pavement structure |
| CN112726311A (en) * | 2020-12-22 | 2021-04-30 | 上海建工集团股份有限公司 | Flexible base asphalt concrete pavement structure and method for plateau alpine region |
| CN113774748A (en) * | 2021-08-20 | 2021-12-10 | 山东高速集团有限公司 | High-toughness grid reinforced asphalt pavement and construction method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537388A (en) * | 2018-11-30 | 2019-03-29 | 长安大学 | Suitable for cold district semi-rigid type base anti-crack road surface structure and construction method |
| CN110080059A (en) * | 2019-06-12 | 2019-08-02 | 吉林省交通规划设计院 | A kind of pavement structure for freeway toll station square |
| CN110714386A (en) * | 2019-11-11 | 2020-01-21 | 上海市市政规划设计研究院有限公司 | Long-life semi-flexible base pavement structure and construction method thereof |
| CN112376349A (en) * | 2020-11-24 | 2021-02-19 | 东南大学 | Long-life flexible base asphalt pavement structure |
| CN112376349B (en) * | 2020-11-24 | 2022-04-08 | 东南大学 | Long-life flexible base asphalt pavement structure |
| CN112726311A (en) * | 2020-12-22 | 2021-04-30 | 上海建工集团股份有限公司 | Flexible base asphalt concrete pavement structure and method for plateau alpine region |
| CN113774748A (en) * | 2021-08-20 | 2021-12-10 | 山东高速集团有限公司 | High-toughness grid reinforced asphalt pavement and construction method thereof |
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