CN210151500U - Combined base asphalt pavement structure - Google Patents
Combined base asphalt pavement structure Download PDFInfo
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- CN210151500U CN210151500U CN201920461363.3U CN201920461363U CN210151500U CN 210151500 U CN210151500 U CN 210151500U CN 201920461363 U CN201920461363 U CN 201920461363U CN 210151500 U CN210151500 U CN 210151500U
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Abstract
The utility model discloses a modular basic unit bituminous paving structure belongs to road pavement technical field. The pavement structure comprises a base layer structure and an asphalt surface layer, wherein the base layer structure comprises a viscoelastic anti-fatigue asphalt mixture buffer cushion layer, a semi-rigid lower base layer and an upper base layer, and the elastic anti-fatigue buffer cushion layer, the semi-rigid lower base layer and the upper base layer are laid on the roadbed from bottom to top. Compared with the prior art, the pavement structure of the utility model reduces the damage of the semi-rigid base layer caused by the void of the roadbed and uneven stress by arranging the asphalt mixture viscoelastic anti-fatigue cushion layer under the semi-rigid base layer, and improves the anti-fatigue performance of the semi-rigid base layer; set up the upper base layer on semi-rigid base layer, improved the ability that the pavement structure resisted the reflection crack, prolonged pavement structure life greatly, effectively avoided the road surface to appear structural damage in short-term, still can attenuate the thickness of semi-rigid base layer simultaneously, reduced the consumption to building materials such as cement, grit material.
Description
Technical Field
The utility model belongs to the technical field of road surface pavement and specifically relates to a modular basic unit bituminous paving structure.
Background
More than 90% of asphalt pavement base course and subbase course of high-grade highway in China are made of semi-rigid material, and the semi-rigid base course material still becomes the main material of the pavement base course in the future high-grade highway construction in China. On one hand, the semi-rigid base layer is strong in integrity and high in axle load sensitivity to heavy traffic, under the action of uneven repetition of heavy axle load, the strength and modulus of the semi-rigid base layer material can be gradually attenuated due to fatigue under the action of dry-wet and freeze-thaw cycles and repeated load, and uneven stress of the semi-rigid base layer can be gradually changed from a whole block to a large block, a small block and a fragment. On the other hand, shrinkage cracking of the semi-rigid base layer and reflective cracking of the asphalt pavement caused by the shrinkage cracking generally cause early damage of the pavement structure, and periodical overhaul and reconstruction cause huge resource waste, capital and environmental protection pressure.
Disclosure of Invention
The technical task of the utility model is to above-mentioned prior art not enough, provide a combination formula basic unit bituminous paving structure with higher life.
The technical task of the utility model is realized according to the following mode: the utility model provides a modular basic unit bituminous paving structure, includes basic unit's structure to and lay the pitch surface course on basic unit's structure, its characteristics are basic unit's structure comprises bituminous mixture viscoelasticity antifatigue cushion, semi-rigid lower basic unit and upper substrate, and bituminous mixture viscoelasticity antifatigue cushion, semi-rigid lower basic unit and upper substrate are laid on the road bed from bottom to top.
In order to enable the roadbed to have higher plastic deformation resistance and fully play the buffering role of the viscoelastic anti-fatigue buffer cushion layer of the asphalt mixture, a cement improvement soil layer or a lime improvement soil layer can be paved on the roadbed top soil. The thickness of the cement improvement soil layer or the lime improvement soil layer is preferably 40cm-80cm below the bottom surface of the viscoelastic anti-fatigue cushion mat of the asphalt mixture.
Furthermore, after the construction of the cement improved soil or the lime improved soil is finished, a slow-breaking anionic emulsified asphalt permeable layer can be sprayed on the top surface of the roadbed, and the permeable layer oil is preferably PC-2 or PA-2 emulsified asphalt. The amount of the emulsified asphalt to be sprayed is preferably 1.5kg/m2-3kg/m2The penetration depth is preferably 5 to 10 mm.
In order to further enhance the bonding strength between the viscoelastic fatigue-resistant cushion coat of the asphalt mixture and the roadbed, before the viscoelastic fatigue-resistant cushion coat of the asphalt mixture is constructed, a modified hot asphalt or modified emulsified asphalt bonding layer is pre-distributed on a permeable layer on the top surface of the roadbed.
The spraying amount of the modified thermal asphalt or the modified emulsified asphalt is 1.8 plus or minus 0.2kg/m2The spreading amount of the crushed stones is 5-8 m3/1000m2About 60% to 70% of the full paved area.
Preferably, the viscoelastic fatigue-resistant cushion layer of the asphalt mixture is a continuous graded asphalt mixture, the void ratio is preferably 1-3%, the mineral aggregate void ratio is preferably 13-20%, and the compacted thickness of the structural layer is preferably 4-8 cm.
Preferably, the upper base layer adopts asphalt stabilized macadam, and the thickness of the asphalt stabilized macadam is preferably 10-18 cm.
Preferably, the lower base layer is made of cement-stabilized macadam, the thickness of the cement-stabilized macadam is preferably 24-30cm, and the lower base layer is paved once in a single layer.
The asphalt surface layer can adopt any asphalt surface layer structure in the prior art, and is preferably composed of an AC-25 lower surface layer, an AC-20 middle surface layer and an SMA-13 upper surface layer.
Compared with the prior art, the combined base asphalt pavement structure has the following outstanding beneficial effects:
the asphalt mixture viscoelastic anti-fatigue cushion layer is directly arranged below the semi-rigid base layer, so that the whole pavement structure is combined with the roadbed more closely, better deformation coordination is realized, and uniform load is favorably transmitted from the pavement structure to the roadbed.
And (II) the viscoelastic anti-fatigue cushion layer of the asphalt mixture is directly arranged below the semi-rigid lower base layer, so that the bottom of the semi-rigid lower base layer is prevented from being hollow, the whole stress of the semi-rigid lower base layer is reduced, the damage of the semi-rigid lower base layer caused by uneven stress is reduced, and the service life of the road is prolonged.
And thirdly, the semi-rigid lower base layer is protected by the viscoelastic anti-fatigue cushion pad layer of the asphalt mixture and the upper base layer, so that the influence of adverse factors such as dry-wet and freeze-thaw cycles on the semi-rigid lower base layer is reduced, the rate of decay of the performance of the semi-rigid lower base layer is reduced, the development of reflection cracks to the surface of the road from the upper layer is delayed, the durability of the road surface structure is improved, the functional early damage of the road surface is effectively reduced, and the fund and social pressure caused by maintenance of the road surface are reduced.
Drawings
FIG. 1 is a schematic structural view of the combined asphalt pavement of the utility model;
FIG. 2 is an enlarged view of the pavement structure A shown in FIG. 1;
FIG. 3 is a schematic representation of a prior art pavement structure;
FIG. 4 is a test result diagram of the forward failure rate of the crack from the bottom of the pavement to the top of the pavement.
Detailed Description
The combined base asphalt pavement structure of the present invention will be described in detail below with reference to the accompanying drawings as specific embodiments.
Example (b):
as shown in fig. 1, the combined base asphalt pavement structure of the embodiment is composed of an asphalt mixture viscoelastic anti-fatigue cushion coat 3, a cement stabilized macadam lower base layer 4, an asphalt stabilized upper base layer 5 and an asphalt surface layer 6. The asphalt mixture viscoelastic anti-fatigue cushion layer 3, the cement stabilized macadam lower base layer 4, the asphalt stabilized upper base layer 5 and the asphalt surface layer 6 are directly paved on the roadbed from bottom to top. The roadbed comprises a soil foundation 1 and a cement-improved soil layer 2 on the top of the soil foundation 1.
Soil improved by cement
1. Index of raw material
The cement-improved soil layer should adopt gravel soil with good gradation as roadbed filling, the maximum grain diameter is 53mm, the uniformity coefficient of the soil is 13, the liquid limit is 35, the plasticity index should not exceed 10, and the organic matter content is less than 1.1%.
2. Improvement of soil property index by cement
The designed thickness of the cement-improved soil layer is 40cm, the cement-improved soil layer is filled in two layers, the compactness is 96.9, and the benkelman beam deflection value represents value 73. The cement dosage of the cement-improved soil is 6 percent (mass percentage), and the representative value of the unconfined compressive strength of the stabilized soil chamber for 7 days is 1.8 MPa.
3. Construction control
During construction, 4 x 4m grids are adopted, gray lines are spread, 7 bags of cement are distributed according to the cement consumption, and then the cement is uniformly spread in the grids by a buckling and lifting method. And after the ash distribution is finished, a road mixer is adopted for mixing for more than two times, so that the mixing depth of the road mixer can be ensured to be 1-2cm higher than that of the lower layer, the mixing is uniform, and no interlayer is left. If two layers are continuously paved, the paving interval is not more than the initial setting time of the used cement, otherwise, layered paving is adopted. And after rolling, spraying water on the covering film in time for curing and sealing the traffic for not less than 7 days before the upper layer is paved.
Second, transparent layer
As shown in fig. 2, after the cement-improved soil layer 2 and the cement stabilized macadam sub-base 4 of this example are constructed, the high permeability slow crack anionic emulsified asphalt permeable layer 2.1(4.1) is spread in the following manner.
1. Raw material
The prime technical index of the penetrating layer oil is PC-2 emulsified asphalt which respectively meets the requirements of the table 1.
TABLE 1 PC-2 technical requirements for quality of permeable emulsified asphalt
2. Requirement for strike-through
The dosage is determined to be 1.3L/m by trial sprinkling2The penetration depth of the emulsified asphalt is about 8 mm.
3. Construction control
Before the permeable layer is poured, the road surface is cleaned, and the permeable layer is poured after the construction of the lower layer is finished and the surface is slightly dry or after the maintenance is finished. The permeable asphalt must be uniformly sprayed by an asphalt spraying vehicle at one time. The penetration depth and viscosity of the permeable asphalt should be confirmed by trial spraying, and holes are dug and detected at the frequency of 5 parts per 10000 square meters in the construction process. The penetration layer oil has to penetrate into the base layer to a depth of less than 5mm and can be integrated with the lower layer.
4. Health preserving
After the permeable layer asphalt is poured, vehicles and pedestrians are strictly prohibited to pass through. The construction unit should keep the base layer of the sprayed-out permeable layer in a good state so as to be connected with the subsequent work. In principle, traffic is closed, construction vehicles which need to run can get on the road after 12 hours, the speed of the construction vehicles is guaranteed to be 3-5km/h, and braking or turning is not needed. If sticking, white lumps should be timely and completely sprinkled. And after 48 hours after the permeable coat oil is sprayed, the construction of the modified asphalt synchronous gravel seal can be carried out.
Sealing layer (tie coat)
In this embodiment, a hot asphalt seal 3.1(5.1) is sprayed before the construction of the viscoelastic anti-fatigue cushion 3 and the asphalt stabilized macadam 5.
1. Raw material
The technical index requirements of SBS modified asphalt are shown in table 2, the aggregate specification adopts limestone macadam, the aggregate is clean, dry, weatherproof and free of impurities, has good particle shape, has nominal particle size of 4.75-9.5 mm, and can be used after being dedusted by an asphalt mixing plant, and the technical requirements of the asphalt modified asphalt meet the requirements of table 3.
TABLE 2 SBS modified asphalt quality specifications
TABLE 3 crushed stone quality technical requirements
2. Seal design requirements
The SBS spreading amount of the seal layer is 1.8/m2The spreading amount of the crushed stones is 7m3/1000m2About 65% of the full paved area.
3. Construction requirements
The SBS modified asphalt is sprayed by a synchronous chip sealer, uniformly sprayed at one time according to the designed asphalt dosage, and after hot asphalt is sprayed, stone chips are immediately sprayed, and the temperature of the hot asphalt is not lower than 80 ℃. After the sealing layer is paved, other construction vehicles are forbidden to pass except for the asphalt mixture paver and the material transporting vehicle.
Fourth, the viscoelastic antifatigue cushion coat of bituminous mixture
The viscoelastic fatigue-resistant cushion coat 3 of the asphalt mixture of the embodiment adopts a continuous graded asphalt mixture, and the specific technical requirements are as follows:
1. raw material
The coarse aggregate has good particle properties, the content of needle-shaped and flaky particles is not more than 12%, the crushing value of the aggregate is not more than 24%, and the binding power of the coarse aggregate and asphalt is grade 5; the equivalent value of the fine aggregate sand is not less than 70 percent, and the unlisted indexes meet the technical Specification for constructing asphalt road surfaces of roads (JTG F40-2004)
The requirement for the hot-mix asphalt mixture is met. The asphalt adopts 90# road petroleum asphalt, and the asphalt saturation degree is as follows: 90 percent and 6.6 percent of asphalt, and the specific index requirements are shown in a table 4:
TABLE 4 technical requirements of matrix asphalt No. 90A-grade road petroleum asphalt
2. Control parameters of asphalt mixture
The synthesis grading is as follows: the passing rate range of standard sieve holes of 13.2mm is 100-100%, the passing rate range of standard sieve holes of 9.5mm is 100-90%, the passing rate range of standard sieve holes of 4.75mm is 75-45%, the passing rate range of standard sieve holes of 2.36mm is 58-30%, the passing rate range of standard sieve holes of 1.18mm is 44-20%, the passing rate range of standard sieve holes of 0.6mm is 32-13%, the passing rate range of standard sieve holes of 0.3mm is 23-9%, the passing rate range of standard sieve holes of 0.15mm is 16-6%, and the passing rate range of standard sieve holes of 0.075mm is 8-4%.
Porosity: 1% -3%;
stability: 6KN-20 KN;
flow value: 2-6 mm;
mineral aggregate void fraction: 13 to 20 percent.
3. Construction requirements are as follows:
the compacted thickness of the viscoelastic anti-fatigue cushion layer 3 of the asphalt mixture is controlled to be 4-8 cm. During construction, the leaving temperature of the mixture is 130-140 ℃, the initial pressure temperature is controlled between 125-135 ℃, a double-steel-wheel road roller is adopted for field compaction, the compaction degree is controlled between 90-95%, and the ultimate fatigue strain is as follows: 70 mu epsilon to 220 mu epsilon.
Cement stabilized macadam base
In the embodiment, the cement stabilized macadam base layer 4 is paved on the viscoelastic anti-fatigue cushion layer 3 of the asphalt mixture, the compaction thickness is controlled to be 24-30cm, and the asphalt mixture is paved and molded at one time. The technical requirements are that according to the requirements of highway cement stabilized macadam base in JTGTF20-2015, the emulsified asphalt permeable layer is sprayed according to the method in the second step after construction.
Sixthly, the asphalt stabilized macadam upper base layer
In the embodiment, an asphalt stabilized macadam upper base layer 5 is paved on a cement stabilized macadam base layer 4, and a hot asphalt seal layer is distributed by the method in the control step 3 before paving.
1. The material requirements are as follows:
the coarse aggregate has good particle properties, the content of needle-shaped and flaky particles is not more than 12%, the crushing value of the aggregate is not more than 24%, and the binding power of the coarse aggregate and asphalt is grade 5; the equivalent value of the fine aggregate sand is not less than 70 percent, and the unlisted indexes meet the requirements of technical Specification for construction of road asphalt pavements (JTG F40-2004) on the hot-mixed asphalt mixture. The asphalt adopts SBS modified asphalt, and the specific index requirements of the asphalt are shown in Table 5.
Table 5 specification requirements for SBS modified asphalt:
2. grading requirements
The open-graded medium-grain asphalt stabilized macadam adopting the modified asphalt has the following synthetic grading:
the passing rate range of a standard sieve pore 31.5mm is 100% -90%, the passing rate range of a standard sieve pore 26.5mm is 95% -70%, the passing rate range of a standard sieve pore 19mm is 76% -40%, the passing rate range of a standard sieve pore 13.2mm is 58% -28%, the passing rate range of a standard sieve pore 9.5mm is 39% -29%, the passing rate range of a standard sieve pore 4.75mm is 29% -6%, the passing rate range of a standard sieve pore 2.36mm is 18% -6%, the passing rate range of a standard sieve pore 1.18mm is 15% -3%, the passing rate range of a standard sieve pore 0.6mm is 10% -2%, the passing rate range of a standard sieve pore 0.3mm is 7% -1%, the passing rate range of a standard sieve pore 0.15mm is 6% -1%, and the passing rate range of a standard sieve pore 0.075mm is 4% -1%.
3. Construction requirements
When the asphalt stabilized macadam upper base 5 is constructed, a lower seal coat is sprayed on a working surface (a cement stabilized macadam lower base 4) in advance. The compaction thickness of the upper base layer of the asphalt stabilized macadam is controlled to be 10-18cm, the leaving temperature of the mixture is 170-185 ℃, the temperature during initial compaction is controlled to be 165-175 ℃, a double-steel-wheel vibratory roller and a rubber wheel are adopted for field compaction, the specific compaction process is subject to the determination process of a field test road, and the void ratio of the mixture is controlled to be 12-17%.
Seven, asphalt surface course
In the embodiment, an asphalt surface course 6 is paved on an asphalt stabilized macadam upper base course 5 and is formed by combining an 8cm AC-25 lower surface course, a 6cm AC-20 middle surface course and a 4cm SMA-13 upper surface course from bottom to top, a hot asphalt adhesive layer is arranged between the courses, and the thickness of each course is calculated according to the structure of a pavement. The technical requirements of the method should meet the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) on three hot-mixed asphalt mixtures.
[ COMPARATIVE EXAMPLE ]
The pavement structure in the prior art is shown in a figure 3, and a 18cm cement-stabilized macadam foundation layer 7, a 18cm cement-stabilized macadam foundation layer 8, a 18cm cement-stabilized macadam foundation layer 9, an 8cmAC-25 lower surface layer 10, a 6cmAC-20 middle surface layer 11 and a 4cmSMA-13 upper surface layer 12 are sequentially arranged above a soil foundation 1 from bottom to top.
The cement stabilized macadam foundation 7, the cement stabilized macadam foundation 8 and the cement stabilized macadam foundation 9 are made of the same mixture as the cement stabilized macadam foundation 4 in the first embodiment, and are constructed according to the requirements of highway cement stabilized macadam foundation in JTGT F20-2015.
[ Experimental example ]
The structure checking calculation analysis is carried out on the road surfaces of the first embodiment and the comparative embodiment by adopting the existing asphalt pavement design specification method and the MEPDG mechanical experience method:
1. calculation analysis method based on American MEPDG
The actual measured structure and material parameters are selected, as shown in the attached figure 4, and the failure rate of the traditional pavement structure (comparison example) from the bottom of the pavement to the top of the pavement is exponentially increased along with time:
y＝0.0505e0.008xwhere y is the cracking rate and x is the time (months).
And the utility model discloses a road surface structure is by the road surface bottom to the following in proper order bad rate of road surface top fracture along with the equation of time change: y is 0.0001x-0.0064, wherein y is the cracking rate, x is the time (month number), and the probability of cracking is almost zero.
2. Road surface structure calculation analysis method based on 2017 asphalt road surface design specification
The fatigue crack checking index of the semi-rigid base layer in the form of the actual measured structure and material parameters and the pavement structures of the embodiment and the comparison example is selected for calculation, and the index is shown in table 6.
Table 6: semirigid base fatigue cracking checking index
Can know by table 6, in design age (20) years, the utility model discloses a semi-rigid basic unit fatigue life of pavement structure is far greater than traditional pavement structure, promptly the utility model discloses a pavement structure can bear the effect of more vehicle loads, has longer life.
Claims (9)
1. The utility model provides a modular basic unit bituminous paving structure, includes basic unit's structure to and lay the pitch surface course on basic unit's structure, its characterized in that, basic unit and upper base constitute down by bituminous mixture viscoelasticity antifatigue cushion, semi-rigid, and bituminous mixture viscoelasticity antifatigue cushion, semi-rigid lower base and upper base lay on the road bed from bottom to top.
2. The asphalt pavement structure of a combined base course according to claim 1, wherein a cement-improving soil layer or a lime-improving soil layer is laid on the topsides soil.
3. The combined base asphalt pavement structure of claim 2, wherein the depth of the cement-improving soil layer or the lime-improving soil layer is 40cm to 80cm below the bottom surface of the viscoelastic fatigue-resistant cushion mat of the asphalt mixture.
4. The combined base asphalt pavement structure according to claim 2, wherein the top surface of the cement-or lime-improved soil layer is coated with a slow-breaking anionic emulsified asphalt permeable layer in an amount of 1.5kg/m2-3kg/m2The penetration depth is 5-10 mm.
5. The asphalt pavement structure with combined base course as claimed in claim 4, wherein before the construction of the viscoelastic fatigue-resistant cushion rubber of asphalt mixture, a modified hot asphalt or modified emulsified asphalt adhesive layer is sprayed in advance on the emulsified asphalt permeable layer of the roadbed top surface.
6. The combined base asphalt pavement structure as claimed in claim 1, wherein the viscoelastic fatigue-resistant cushion coat of the asphalt mixture has a void ratio of 1-3%, a mineral aggregate void ratio of 13-20%, and a compacted thickness of the structural layer of 4-8 cm.
7. The asphalt pavement structure with combined base course as claimed in claim 1, wherein said upper base course is made of asphalt stabilized macadam and has a thickness of 10-18 cm.
8. The asphalt pavement structure with combined base course according to claim 1, wherein the semi-rigid lower base course is constructed by cement-stabilized macadam with a thickness of 20-30cm in a single layer.
9. The modular base asphalt pavement structure of claim 1, wherein the asphalt top course is comprised of an AC-25 lower course, an AC-20 middle course, and an SMA-13 upper course.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920461363.3U CN210151500U (en) | 2019-04-04 | 2019-04-04 | Combined base asphalt pavement structure |
| PCT/CN2020/076096 WO2020199781A1 (en) | 2019-04-04 | 2020-02-21 | Method for paving combined base course asphalt road surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920461363.3U CN210151500U (en) | 2019-04-04 | 2019-04-04 | Combined base asphalt pavement structure |
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| CN210151500U true CN210151500U (en) | 2020-03-17 |
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| CN201920461363.3U Expired - Fee Related CN210151500U (en) | 2019-04-04 | 2019-04-04 | Combined base asphalt pavement structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114197262A (en) * | 2021-11-19 | 2022-03-18 | 山东省交通科学研究院 | Method for treating combination of full-thickness asphalt pavement and roadbed |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114197262A (en) * | 2021-11-19 | 2022-03-18 | 山东省交通科学研究院 | Method for treating combination of full-thickness asphalt pavement and roadbed |
| CN114197262B (en) * | 2021-11-19 | 2023-06-16 | 山东省交通科学研究院 | Method for treating combination of full-thickness asphalt pavement and roadbed |
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