CN115506191B - Durable asphalt pavement structure suitable for non-extra-heavy traffic grade and design method - Google Patents
Durable asphalt pavement structure suitable for non-extra-heavy traffic grade and design method Download PDFInfo
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Abstract
The invention relates to the technical field of old cement concrete pavement reconstruction, and particularly discloses a durable asphalt pavement structure suitable for non-extra-heavy traffic grades and a design method, wherein the pavement structure sequentially comprises the following components from top to bottom: an anti-slip wear-resistant asphalt concrete upper surface layer, a function-adjustable asphalt concrete lower surface layer, an economic asphalt macadam disposal layer, a bearing type graded macadam base layer, an old cement concrete panel rubble upper layer and an old cement concrete panel rubble lower layer. The durable asphalt pavement structure with non-extra heavy traffic grade is used for repairing and reforming the old cement concrete pavement with damaged pavement, the old cement concrete pavement is crushed into upper and lower layers with different moduli, then a graded broken stone layer with large grain size is additionally paved, and an asphalt broken stone disposal layer is additionally paved on a graded broken stone base layer, so that the formed composite asphalt pavement structure has the advantages of good integrity, high pavement bearing capacity, high traffic grade, good fatigue resistance, capability of eliminating reflection cracks and capability of improving long-term service performance of the pavement.
Description
Technical Field
The invention belongs to the technical field of old cement concrete pavement reconstruction, and particularly relates to a durable asphalt pavement structure suitable for non-extra-heavy traffic grades and a design method.
Background
By 2012, the total mileage of the cement concrete pavement in China reaches 165.3 ten thousand kilometers, and the cement concrete pavement in China becomes one of the most countries in the world. However, with the increase of traffic, under the combined action of the load of the driving and the natural environment, the cement concrete pavement inevitably has diseases such as fracture, subsidence, staggering, mud pumping and the like, and the increase of heavy load and overload vehicles further aggravates the generation and development of the diseases. Therefore, effective measures must be taken to enhance maintenance and repair of cement concrete pavement.
At present, the technology for modifying the old cement concrete pavement mainly comprises the following two modes: firstly, adding a cement concrete pavement (Bai Jiabai); secondly, the cement concrete pavement is additionally paved with the asphalt concrete pavement, and the mode has two different structural forms: the first is that after the maintenance treatment of the cement concrete pavement, an intermediate transition layer is additionally paved, and then an asphalt surface layer (white and black) is additionally paved; the second is that after the cement concrete pavement is broken, the cement concrete pavement is compacted (or a base layer is additionally paved), and then an asphalt surface layer (white to black) is additionally paved, namely, the stone breaking transformation is realized.
The cement concrete pavement 'white and black' mode is a cement pavement reconstruction and utilization mode which is widely applied at present, and can well utilize the strength of a raw cement pavement structure, and the construction is relatively simple and convenient; but can not fundamentally solve the problem of reflection cracks of longitudinal and transverse seams of the original cement pavement, the reflection cracks are diseases with the greatest harm to the road pavement, and the reflection cracks not only produce fatal diseases to the base layer, but also produce great harm to the surface layer; although the middle transition layer can be paved, the time of reflecting cracks can be delayed and delayed, the service life is short, and the paving cost is high.
Disclosure of Invention
The invention aims to be suitable for durable asphalt pavement structures of non-extra-heavy traffic grades, and is used for modifying old cement concrete pavement, improving the stress characteristics of the pavement, eliminating reflection cracks, enhancing the bearing effect of the pavement and prolonging the service life.
In order to achieve the above object, the present invention provides a durable asphalt pavement structure suitable for non-extra heavy traffic class, comprising, in order from top to bottom: an anti-slip wear-resistant asphalt concrete upper surface layer, a function-adjustable asphalt concrete lower surface layer, an economic asphalt macadam disposal layer, a bearing type graded macadam base layer, an old cement concrete panel rubble upper layer and an old cement concrete panel rubble lower layer.
Preferably, in the durable asphalt pavement structure suitable for non-extra heavy traffic grade, the thickness of the upper surface layer of the anti-skid wear-resistant asphalt concrete is 3-6 cm, the thickness of the lower surface layer of the functional asphalt concrete is 5-7 cm, the thickness of the economical asphalt macadam treatment layer is 1-3 cm, the thickness of the bearing type graded macadam base layer is 20-32 cm, the thickness of the upper layer of the crushed stone of the old cement concrete panel is 8-10 cm, and the thickness of the lower layer of the crushed stone of the old cement concrete panel is 10-15 cm.
Preferably, in the durable asphalt pavement structure suitable for the non-extra heavy traffic grade, the anti-skid and wear-resistant asphalt concrete upper layer adopts AC asphalt concrete, SMA asphalt concrete or Superpave asphalt concrete of diabase or basalt.
Preferably, in the durable asphalt pavement structure suitable for non-extra heavy traffic grade, the function-adjustable asphalt concrete lower surface layer is AC-20, AC-25 or ATB-25 asphalt mixture, and the asphalt is matrix asphalt, modified asphalt or high-modulus asphalt; the dynamic stability of the lower layer of the function-adjustable asphalt concrete is more than or equal to 2400 times/mm, and the dynamic modulus is more than or equal to 8000MPa.
Preferably, in the durable asphalt pavement structure suitable for non-extra-heavy traffic grade, the economical asphalt macadam treatment layer is a double-layer asphalt macadam sealing layer paved by adopting a layer paving method, and the asphalt spraying amount of the first layer of matrix is 0.9-1.1 kg/m 2 The asphalt spraying amount of the second layer of matrix is 0.6-0.8 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the 10-14 m of coarse aggregate with 10-15 mm of sprinkling amount 3 /1000m 2 The sprinkling amount of the coarse aggregate with the thickness of 5-10 mm is 7-9 m 3 /1000m 2 The method comprises the steps of carrying out a first treatment on the surface of the The rebound modulus of the economical asphalt macadam treatment layer is 4000-5000 MPa. Sequentially sprinkling a first layerMatrix asphalt, 10-15 mm coarse aggregate, a second layer of matrix asphalt and 5-10 mm coarse aggregate, and then rolling and forming.
Preferably, in the durable asphalt pavement structure suitable for the non-extra-heavy traffic grade, the matrix asphalt is 70# or 90# matrix asphalt, and the coarse aggregate of 10-15 mm and the coarse aggregate of 5-10 mm are limestone, basalt or diabase.
Preferably, in the durable asphalt pavement structure suitable for the non-extra-heavy traffic grade, the maximum nominal particle size of the broken stone of the bearing graded broken stone base layer is 40-60 mm, and the rebound modulus is 600-800 MPa. The maximum nominal particle size of the crushed stone of the bearing type graded crushed stone base layer is increased, so that the bearing capacity is improved, and the using amount of the crushed stone is reduced.
Preferably, in the durable asphalt pavement structure suitable for non-extra-heavy traffic grade, the bearing graded broken stone base layer comprises the following materials in percentage by mass: 15% -20% of 40-60 mm coarse aggregate, 22% -25% of 20-40 mm coarse aggregate, 18% -20% of 10-20 mm or 10-30 mm coarse aggregate, 26% -40% of fine aggregate, 4% -6% of water and the rebound modulus of 600-800 MPa. The aggregate is one or more of limestone, granite and sandstone. The bearing graded broken stone base layer is formed by matching aggregates with different particle sizes, filling pores step by step and compacting.
Preferably, in the durable asphalt pavement structure suitable for the non-extra-heavy traffic grade, the bearing type graded broken stone base layer is a micro-bonded graded broken stone base layer of cement with the mixing amount of 1% -2%, the mixing amount of cement is calculated by the mass fraction of aggregate, and the rebound modulus is 700-900 MPa.
Preferably, in the durable asphalt pavement structure suitable for the non-extra heavy traffic grade, the upper layer of the worn cement concrete panel rubblization and the lower layer of the worn cement concrete panel rubblization are made of materials of which the worn cement concrete panel is subjected to resonance rubblization, and the rebound modulus of the upper layer of the worn cement concrete panel rubblization is 500-900 mpa; and the rebound modulus of the crushed petrochemical lower layer of the old cement concrete panel is 1000-1400 MPa. The resonance rubblization technology breaks the old cement panel into a two-layer structure, wherein the upper layer is a rubble layer, the lower layer is a compact structure, and the lower layer modulus is higher than the upper layer modulus, so that reflection cracks are prevented, and the bearing capacity is higher.
Preferably, in the durable asphalt pavement structure suitable for the non-extra-heavy traffic grade, the particle size of broken stone of the crushed stone upper layer of the old cement concrete panel is 0.075-26.5 mm, and the particle size of broken stone of the crushed stone lower layer of the old cement concrete panel is 12-15 cm.
The design method of the durable asphalt pavement structure suitable for the non-extra-heavy traffic grade comprises the following steps of:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, the technical condition of the old cement pavement and the environmental condition of the old pavement;
(2) According to local traffic load, the structure and the type of the road surface are primarily simulated;
(3) Determining technical parameters of each structural layer of the pavement according to the related test;
(4) Adopting an elastic layered system theory to check the fatigue cracking life of the asphalt mixture, the permanent deformation of the asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed;
(5) Checking and calculating the shearing stress of the crushed petrochemical upper layer of the old cement pavement by adopting a molar coulomb theory, wherein the crushed petrochemical upper layer of the old cement pavement is a loose interlayer, so that pavement diseases caused by insufficient shearing stress are prevented;
(6) And obtaining a pavement structure scheme suitable for the non-extra-heavy traffic load grade.
Preferably, in the above method for designing a durable asphalt pavement structure suitable for a non-extra heavy traffic grade, in the step (2), the relevant test includes a dynamic rebound modulus test, a static rebound modulus test, and a rutting test.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the durable asphalt pavement structure with the non-extra-heavy traffic grade, the old cement concrete pavement is crushed to form the upper layer and the lower layer with different moduli, the large-grain-size graded crushed stone layer is additionally paved, and the asphalt crushed stone disposal layer is additionally paved on the graded crushed stone base layer, so that the formed composite asphalt pavement structure has the advantages of good integrity, high pavement bearing capacity, high traffic grade bearing, good fatigue resistance, capability of eliminating reflection cracks, improvement of long-term service performance of the pavement and prolonged service life of the pavement.
2. The durable asphalt pavement structure with the non-extra-heavy traffic grade is applied to maintenance and reconstruction of an old cement concrete pavement with damaged pavement, crushed stone of the old cement pavement is adopted to enlarge the grain size grading crushed stone, and meanwhile, an asphalt crushed stone treatment layer is adopted as a stress absorption layer, so that a novel flip-chip pavement structure is formed, and the service life of the pavement after the crushed stone reconstruction of the old cement concrete pavement can be remarkably prolonged.
3. According to the design method of the durable asphalt pavement structure with the non-extra-heavy traffic grade, according to the rubble mechanism of the old cement concrete panel and the modulus difference of different structural layers, the durable asphalt pavement structure is divided into two layers, wherein the upper layer is a rubble layer, the lower layer is a compact layer, and the modulus of the lower layer is higher than that of the upper layer, so that the durable asphalt pavement structure has a certain bearing capacity and a reflection crack prevention effect.
Drawings
FIG. 1 is a schematic illustration of the construction of a durable asphalt pavement of the present invention suitable for use in non-extra heavy traffic classes.
Fig. 2 is a schematic diagram of the structural design flow of the durable asphalt pavement applicable to non-extra-heavy traffic grade in embodiment 3 of the present invention.
The main reference numerals illustrate:
1-an upper layer of anti-slip wear-resistant asphalt concrete, 2-a lower layer of function-adjustable asphalt concrete, a 3-an economical asphalt macadam disposal layer, a 4-a bearing type graded macadam base layer, a 5-an upper layer of crushed stone of an old cement concrete panel, a lower layer of crushed stone of an old cement concrete panel and a 7-an original pavement base layer.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.
Example 1
A design method of a durable asphalt pavement structure suitable for non-extra-heavy traffic grade comprises the following steps:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, the technical condition of the old cement pavement and the environmental condition of the old pavement;
(2) According to local traffic load, the structure and the type of the road surface are primarily simulated;
(3) Determining technical parameters of each structural layer of the pavement according to a dynamic rebound modulus test, a static rebound modulus test and a rutting test related test;
(4) Adopting an elastic layered system theory to check the fatigue cracking life of the asphalt mixture, the permanent deformation of the asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed;
(5) Checking and calculating the shearing stress of the crushed petrochemical upper layer of the old cement pavement by adopting a molar coulomb theory, wherein the crushed petrochemical upper layer of the old cement pavement is a loose interlayer, so that pavement diseases caused by insufficient shearing stress are prevented;
(6) And obtaining a pavement structure scheme suitable for the non-extra-heavy traffic load grade.
The durable asphalt pavement structure suitable for non-extra heavy traffic grade of this embodiment, as shown in fig. 1, is as follows from top to bottom:
the anti-slip wear-resistant asphalt concrete upper layer 1 is made of common AC-16 asphalt concrete;
the function-adjustable asphalt concrete lower surface layer 2 is made of common AC-20 asphalt concrete;
an economic asphalt macadam treatment layer 3, wherein double asphalt macadams are paved on the layer;
the bearing graded broken stone base layer 4 has the maximum nominal particle size of 40-60 mm;
the old cement concrete panel rubblize upper layer 5;
the old cement concrete panel rubblizing lower layer 6;
the thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 1.
Table 1 table of technical parameters of each layer of pavement structure of example 1
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Ordinary AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Economical asphalt macadam disposal layer | 3 | 5000 | 0.25 | 2.5 |
| Bearing graded broken stone base layer | 20 | 650 | 0.35 | |
| Old cement concrete panel rubblization upper layer | 10 | 600 | 0.35 | |
| Old cement concrete panel rubblization upper layer | 10 | 1000 | 0.35 |
The pavement structure of the embodiment adopts 100KN standard axle load, and the number of times of the axle load is 8.02 multiplied by 10 6 Secondary, heavy traffic type; according to the current regulations of China (JTG D50-2017), the road asphalt pavement is heavy-load traffic; the theoretical calculation of the elastic lamellar system is adopted to obtain that the cumulative action frequency of equivalent design axle load on a design lane in the design service life is 1.98x10 7 Shaft times; asphalt layer bottom tensile strain is epsilon=107.9×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=66×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=11.22 mm.
Comparative example 1:
the road surface structure of this comparative example is a conventional road surface structure, and the top-down is in turn: a dense graded asphalt concrete upper surface layer, a dense graded asphalt concrete lower surface layer, a graded broken stone base layer (the maximum nominal particle size of broken stone is 26.5-31.5 mm), and a crushed stone layer of an old cement pavement; the thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 2:
table 2 table of technical parameters of each layer of pavement structure of comparative example 1
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Ordinary AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Graded broken stone base layer | 22 | 400 | 0.35 | |
| Crushed petrochemical layer of old cement pavement | 10 | 600 | 0.35 |
The pavement structure of this comparative example can withstand a maximum cumulative equivalent axial number of 3.49×10 6 Secondary, light traffic load; the accumulated action frequency of equivalent design axle load on the design lane within the design service life is 8.63 multiplied by 10 6 Shaft times; asphalt layer bottom tensile strain is epsilon=114.4×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=187×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=5.55 mm.
In comparative example 1 and comparative example 1, an economical asphalt macadam treatment layer was added in example 1, the maximum nominal particle diameter and modulus of the graded macadam base layer were adjusted, and the old cement pavement was crushed into a two-layer structure, the upper layer was a crushed stone structure, the lower layer was a compact structure, and the lower layer modulus was higher than the upper layer modulus, thereby obtaining a pavement structure capable of withstanding heavy traffic and having a long service life. Compared with comparative example 1, the durable asphalt pavement structure modified from the old cement concrete pavement of the embodiment of the invention can bear heavy traffic, has good fatigue resistance and long service life, and the service life is 2.2 times that of comparative example 1, and the tensile strain of the asphalt layer bottom and the vertical compressive strain of the roadbed top surface are lower than those of comparative example 1.
Example 2
The durable bituminous pavement structure suitable for non-extra-heavy traffic grade of this embodiment is in proper order from top to bottom:
the anti-skid wear-resistant asphalt concrete upper layer 1 is made of modified AC-16 asphalt concrete;
the function-adjustable asphalt concrete lower surface layer 2 is made of common AC-20 asphalt concrete;
an economic asphalt macadam treatment layer 3, wherein double asphalt macadams are paved on the layer;
a bearing graded broken stone base layer 4, a micro-bonding graded broken stone base layer doped with cement, wherein the maximum nominal particle size of broken stone is 37.5-53 mm;
the old cement concrete panel rubblize upper layer 5;
the old cement concrete panel rubblizing lower layer 6;
the thickness, modulus, poisson ratio and other parameters of each layer are shown in table 3.
Table 3 table of pavement Structure layers parameters of example 2
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Modified AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Economical asphalt macadam disposal layer | 3 | 5000 | 0.25 | 2.5 |
| Micro-bonded graded macadam base | 20 | 800 | 0.35 | |
| Crushed petrochemical upper layer of old cement pavement | 10 | 600 | 0.35 | |
| Crushed petrochemical lower layer of old cement pavement | 10 | 1000 | 0.35 |
The pavement structure of the embodiment adopts 100KN standard axle load, and the number of times of the axle load is 1.39 multiplied by 10 7 Secondary times; according to the current regulations of China (JTG D50-2017), the road asphalt pavement is heavy-load traffic; the theoretical calculation of the elastic lamellar system is adopted to obtain that the accumulated action frequency of equivalent design axle load on a design lane in the design service life is 3.45 multiplied by 10 7 Shaft times; asphalt layer bottom tensile strain is epsilon=95.8×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=73x10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=14.76 mm. Meets the specification requirements.
Comparative example 2
The road surface structure of this comparative example is a conventional road surface structure, and the top-down is in turn: a dense graded asphalt concrete upper surface layer, a dense graded asphalt concrete lower surface layer, a graded broken stone base layer (micro-bonded graded broken stone base layer, the maximum nominal particle size of broken stone is 26.5-31.5 mm), and an old cement pavement crushed petrochemical layer; the thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 4:
table 4 table of technical parameters of each layer of pavement structure of comparative example 2
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Modified AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Micro-bonded graded macadam base | 30 | 500 | 0.35 | |
| Crushed petrochemical layer of old cement pavement | 10 | 600 | 0.35 |
The pavement structure of this comparative example can withstand a maximum cumulative equivalent axial number of 3.84×10 6 Secondary, light traffic load; the accumulated action frequency of equivalent design axle load on the design lane within the design service life is 9.49 multiplied by 10 6 Shaft times; asphalt layer bottom tensile strain is epsilon=112.6x10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=149×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=5.71 mm.
The pavement structures of example 2 and comparative example 2 were examined for vertical shear stress using the molar coulomb theory, and the results are shown in table 5, from which it is clear that the vertical shear stress of example 2 is lower than that of comparative example 2. In example 2, the upper layer of the old cement pavement rubble was a loose interlayer, but as can be seen from table 5, the shear stress of the upper layer of the old cement pavement rubble in example 2 was significantly reduced and the shear stress was strong as compared with comparative example 2. In addition, the shear stress of the upper layer and the bottom of the asphalt concrete is obviously reduced, which indicates that the shear fatigue resistance is improved.
Table 5 vertical shear stress of pavement structures of example 2 and comparative example 2
In summary, the economic asphalt macadam treatment layer is added in the embodiment 2, so that the fatigue resistance of the pavement structure is improved, and the micro-bonding graded macadam base layer with the macadam with the large nominal particle size is adopted, so that the bearing performance is better; the resonance rubblization technology breaks the old cement panel into a two-layer structure, wherein the upper layer is a rubble layer, the lower layer is compact, the resonance rubblization technology has the characteristic of cracking but not breaking, and the lower layer modulus is higher than the upper layer modulus. Compared with comparative example 2, example 2 can withstand heavy traffic, and has a service life 3.6 times that of comparative example 2, and the tensile strain of the asphalt layer bottom and the vertical compressive strain of the subgrade top surface are lower than those of comparative example 2.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A durable asphalt pavement structure suitable for non-extra heavy traffic grades, comprising, in order from top to bottom: an anti-slip wear-resistant asphalt concrete upper surface layer, a function-adjustable asphalt concrete lower surface layer, an economic asphalt macadam disposal layer, a bearing type graded macadam base layer, an old cement concrete panel rubble upper layer and an old cement concrete panel rubble lower layer;
the anti-slip wear-resistant asphalt concrete upper layer adopts AC asphalt concrete of diabase or basalt, SMA concrete or Superpave asphalt concrete;
the lower layer of the function-adjustable asphalt concrete adopts an AC-20, AC-25 or ATB-25 asphalt mixture, and the asphalt is matrix asphalt, modified asphalt or high-modulus asphalt; the dynamic stability of the lower layer of the function-adjustable asphalt concrete is more than or equal to 2400 times/mm, and the dynamic modulus is more than or equal to 8000MPa;
the maximum nominal particle size of the crushed stone of the bearing type graded crushed stone base layer is 40-60 mm, the rebound modulus is 600-800 MPa, and the bearing type graded crushed stone base layer comprises the following materials in percentage by mass: 15-20% of 40-60 mm coarse aggregate, 22-25% of 20-40 mm coarse aggregate, 18-20% of 10-20 mm or 10-30 mm coarse aggregate, 26-40% of fine aggregate and 4-6% of water;
the economical asphalt macadam treatment layer is a double-layer asphalt macadam sealing layer, and the rebound modulus is 4000-5000MPa; the asphalt spreading amount of the first layer of matrix is 0.9-1.1 kg/m 2 The asphalt spraying amount of the second layer of matrix is 0.6-0.8 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the 10-14 m of coarse aggregate with 10-15 mm of sprinkling amount 3 /1000m 2 The sprinkling amount of the coarse aggregate with the thickness of 5-10 mm is 7-9 m 3 /1000m 2 ；
The upper layer of the old cement concrete panel rubblization and the lower layer of the old cement concrete panel rubblization are made of materials of which the old cement concrete panel is subjected to resonance rubblization, and the rebound modulus of the upper layer of the old cement concrete panel rubblization is 500-900 MPa; and the rebound modulus of the crushed petrochemical lower layer of the old cement concrete panel is 1000-1400 MPa.
2. The durable asphalt pavement structure suitable for non-extra heavy traffic grades according to claim 1, wherein the thickness of the upper surface layer of the anti-skid wear-resistant asphalt concrete is 3-6 cm, the thickness of the lower surface layer of the functional asphalt concrete is 5-7 cm, the thickness of the economical asphalt macadam treatment layer is 1-3 cm, the thickness of the bearing graded macadam base layer is 20-32 cm, the thickness of the upper crushed stone layer of the old cement concrete panel is 8-10 cm, and the thickness of the lower crushed stone layer of the old cement concrete panel is 10-15 cm.
3. The durable asphalt pavement structure suitable for non-extra heavy traffic grades according to claim 1, wherein the bearing graded broken stone base layer further comprises cement with the mixing amount of 1% -2%, the mixing amount of the cement is calculated by the mass fraction of aggregate, and the rebound modulus is 700-900 mpa.
4. The method of designing a durable asphalt pavement structure for non-extra heavy traffic grades according to claim 1, comprising the steps of:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, the technical condition of the old cement pavement and the environmental condition of the old pavement;
(2) According to local traffic load, the structure and the type of the road surface are primarily simulated;
(3) Determining parameters of each structural layer of the pavement according to the related test;
(4) Adopting an elastic layered system theory to check the fatigue cracking life of the asphalt mixture, the permanent deformation of the asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed;
(5) Checking and calculating the upper layer shear stress of the rubblization of the old cement pavement by adopting a molar coulomb theory;
(6) And obtaining a pavement structure scheme suitable for the non-extra-heavy traffic load grade.
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| CN103031788A (en) * | 2013-01-07 | 2013-04-10 | 天津市市政工程设计研究院 | Method for designing long-life composite pavement structure of underground road |
| CN204753293U (en) * | 2015-06-08 | 2015-11-11 | 西安公路研究院 | Main line cement concrete pavement " bai jiahei " regeneration structure is economized by state |
| CN205382375U (en) * | 2016-03-08 | 2016-07-13 | 山西省交通科学研究院 | Permanent seal cooling bituminous pavement structure suitable for longitudinal gradient highway section of growing up |
| AU2019202413A1 (en) * | 2018-06-17 | 2020-01-16 | Duy Huu Nguyen | Improved concrete road pavement with more sustainability benefits |
| CN113215907A (en) * | 2021-05-13 | 2021-08-06 | 中铁五局集团机械化工程有限责任公司 | Asphalt additional paving structure for old concrete pavement of urban road intersection and construction method thereof |
| CN216338805U (en) * | 2021-09-26 | 2022-04-19 | 广西交科集团有限公司 | Flexible composite layer pavement structure for resonant rubblization and large-particle-size stone paving |
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