CN109944124B - Combined base asphalt pavement paving method - Google Patents
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Abstract
The invention discloses a method for paving a combined base asphalt pavement, and belongs to the technical field of road pavement. The pavement structure comprises a base layer structure and an asphalt surface layer, and is characterized in that the base layer structure is composed of an asphalt mixture viscoelastic anti-fatigue cushion layer, a semi-rigid lower base layer and an upper base layer, and the elastic anti-fatigue cushion layer, the semi-rigid lower base layer and the upper base layer are paved on a roadbed from bottom to top. Compared with the prior art, the pavement structure paving method provided by the invention has the advantages that the asphalt mixture viscoelastic anti-fatigue buffer cushion is arranged below the semi-rigid base layer, so that the damage to the semi-rigid base layer caused by roadbed void and uneven stress is reduced, and meanwhile, the anti-fatigue performance of the semi-rigid base layer is improved; 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 invention relates to the field of pavement, in particular to a method for paving a combined base asphalt pavement.
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 invention is to provide a combined base layer asphalt pavement method with longer service life aiming at the defects of the prior art.
The technical task of the invention is realized by the following modes: a combined base asphalt pavement paving method is characterized in that a base structure and an asphalt surface layer are sequentially paved on a roadbed from bottom to top, the base structure is composed of an asphalt mixture viscoelastic fatigue-resistant cushion layer, a semi-rigid lower base layer and an upper base layer, and the asphalt mixture viscoelastic fatigue-resistant cushion layer, the semi-rigid lower base layer and the upper base layer are paved on the roadbed from bottom to top.
In order to make the roadbed have higher capacity of resisting plastic deformation and fully exert the buffering effect of the viscoelastic anti-fatigue buffer cushion layer of the asphalt mixture, the roadbed top soil preferably adopts cement improved soil or lime improved soil.
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 depth of the improved soil is preferably 40cm-80cm below the bottom surface of the viscoelastic anti-fatigue cushion layer of the asphalt mixture.
The improved soil compaction is preferably 96% to 100%.
The mass percentage mixing amount of the cement in the cement-improved soil is preferably 4-6%.
The mass percentage mixing amount of lime in the lime-improved soil is preferably 6-8%.
The content of evaporated residue in the emulsified asphalt is preferably 50% to 90%.
The spreading amount of the emulsified asphalt is not less than 1.5kg/m2Preferably 1.5kg/m2-3kg/m2。
The penetration depth of the emulsified asphalt is preferably 5-10 mm.
The deflection value of the roadbed top surface is 50-120(0.01mm), preferably 50-90(0.01 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 of the asphalt mixture can adopt a continuous graded asphalt mixture, in particular a continuous graded asphalt mixture A, a continuous graded asphalt mixture B or a continuous graded asphalt mixture C with the following grading range.
The A grading range of the asphalt mixture is preferably as follows:
the passing rate range of the standard sieve holes is 100%, the passing rate range of the standard sieve holes is 100-95%, the passing rate range of the standard sieve holes is 96-90%, the passing rate range of the standard sieve holes is 84-73%, the passing rate range of the standard sieve holes is 4.75mm is 60-45%, the passing rate range of the standard sieve holes is 55-40%, the passing rate range of the standard sieve holes is 39-30%, the passing rate range of the standard sieve holes is 0.6mm is 30-20%, the passing rate range of the standard sieve holes is 25-16%, the passing rate range of the standard sieve holes is 18-13%, and the passing rate range of the standard sieve holes is 0.075mm is 10-6%.
The asphalt mixture B grading range 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%.
The asphalt mixture C grading range is as follows:
the passing rate range of the standard sieve holes with 9.5mm is 100-100%, the passing rate range of the standard sieve holes with 4.75mm is 100-90%, the passing rate range of the standard sieve holes with 2.36mm is 85-65%, the passing rate range of the standard sieve holes with 1.18mm is 65-42%, the passing rate range of the standard sieve holes with 0.6mm is 46-26%, the passing rate range of the standard sieve holes with 0.3mm is 32-15%, the passing rate range of the standard sieve holes with 0.15mm is 21-10%, and the passing rate range of the standard sieve holes with 0.075mm is 12-7%.
The control parameters of the viscoelastic anti-fatigue cushion asphalt mixture comprise:
the porosity is preferably 1% -3%;
the stability is preferably 6KN-20 KN;
the flow value is preferably 2-6 mm;
the mineral aggregate gap rate is preferably 13% -20%;
the asphalt saturation is preferably 80-100%;
the compaction thickness of the structural layer is preferably 4-8 cm;
the compaction degree of the structural layer in the construction process is preferably 85-95 percent;
the ultimate fatigue strain is preferably 70 mu epsilon-220 mu epsilon.
The viscoelastic anti-fatigue cushion asphalt mixture asphalt is preferably No. 90 or No. 110 high-grade road petroleum asphalt.
The asphalt dosages of the three continuous graded asphalt mixtures are respectively as follows:
the asphalt dosage of the asphalt mixture A is 6.0-6.5%, preferably 6.2-6.4%;
and (3) testing the asphalt dosage of the asphalt mixture B: 6.3-7.0%, preferably 6.5-6.7%;
asphalt mixture C reference asphalt dosage: 7.0 to 7.5%, preferably 7.2 to 7.4%.
Preferably, the upper base layer is made of 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 macadam is paved in a single layer.
The asphalt surface course can adopt any asphalt surface course structure in the prior art, such as an asphalt surface course consisting of an AC-25 lower surface course, an AC-20 middle surface course and an SMA-13 upper surface course.
Compared with the prior art, the combined base layer asphalt pavement method 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 a combined asphalt pavement of the present invention;
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 asphalt pavement method of a modular base layer according to the present invention will be described in detail below with reference to the accompanying drawings as specific embodiments.
Example (b):
as shown in the attached figure 1, the method for paving the combined base asphalt pavement comprises 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 method
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
After the construction of the cement-improved soil layer 2 and the cement stabilized macadam lower base 4 of the embodiment is completed, the high-permeability slow-cracking anionic emulsified asphalt permeable layer 2.1(4.1) is sprayed according to the following method.
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 method
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 (mixture B), 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 requirements of technical Specification for construction of road asphalt pavements (JTG F40-2004) on the hot-mixed asphalt mixture. 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 JTGT F20-2015, 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 2, 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 3, 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).
The equation of the change of the sequential failure rate of the pavement structure from the bottom of the pavement to the top of the pavement along with time is as follows: 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
From the above table, within the design period (20 years), the fatigue life of the semi-rigid base layer of the pavement structure is far longer than that of the traditional pavement structure, namely the pavement structure can bear the action of more vehicle loads and has longer service life.
Claims (6)
1. A combined base asphalt pavement paving method is characterized in that a base structure and an asphalt surface layer are sequentially paved on a roadbed from bottom to top, the base structure is composed of an asphalt mixture viscoelastic fatigue-resistant cushion layer, a semi-rigid lower base layer and an upper base layer, the asphalt mixture viscoelastic fatigue-resistant cushion layer, the semi-rigid lower base layer and the upper base layer are paved on the roadbed from bottom to top, soil on the top surface of the roadbed adopts cement improved soil or lime improved soil, the semi-rigid lower base layer adopts cement stabilized macadam, the upper base layer adopts asphalt stabilized macadam,
the viscoelastic anti-fatigue cushion adopts a continuous graded asphalt mixture A, a continuous graded asphalt mixture B or a continuous graded asphalt mixture C,
the asphalt mixture A grading range is as follows:
the standard sieve pore passage rate range of 19mm is 100%, the standard sieve pore passage rate range of 16mm is 100% -95%, the standard sieve pore passage rate range of 13.2mm is 96% -90%, the standard sieve pore passage rate range of 9.5mm is 84% -73%, the standard sieve pore passage rate range of 4.75mm is 60% -45%, the standard sieve pore passage rate range of 2.36mm is 55% -40%, the standard sieve pore passage rate range of 1.18mm is 39% -30%, the standard sieve pore passage rate range of 0.6mm is 30% -20%, the standard sieve pore passage rate range of 0.3mm is 25% -16%, the standard sieve pore passage rate range of 0.15mm is 18% -13%, and the standard sieve pore passage rate range of 0.075mm is 10% -6%;
the asphalt mixture B grading range 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%;
the asphalt mixture C grading range is as follows:
the passing rate range of a standard sieve pore of 9.5mm is 100-100%, the passing rate range of a standard sieve pore of 4.75mm is 100-90%, the passing rate range of a standard sieve pore of 2.36mm is 85-65%, the passing rate range of a standard sieve pore of 1.18mm is 65-42%, the passing rate range of a standard sieve pore of 0.6mm is 46-26%, the passing rate range of a standard sieve pore of 0.3mm is 32-15%, the passing rate range of a standard sieve pore of 0.15mm is 21-10%, and the passing rate range of a standard sieve pore of 0.075mm is 12-7%;
the control parameters of the viscoelastic anti-fatigue cushion asphalt mixture comprise:
porosity: 1% -3%;
stability: 6KN-20 KN;
flow value: 2-6 mm;
mineral aggregate void fraction: 13% -20%;
asphalt saturation degree: 80% -100%;
compacting thickness of a structural layer: 4-8 cm;
and (3) compactness in the construction process of the structural layer: 85% -95%;
ultimate fatigue strain: 70 mu epsilon-220 mu epsilon;
the depth of the improved soil is 40cm-80cm below the bottom surface of the viscoelastic anti-fatigue cushion layer of the asphalt mixture;
the soil compaction degree is improved to 96% -100%;
the mass percentage of the cement in the cement-improved soil is 4-6%;
the mass percentage of lime in the lime-improved soil is 6-8%;
the spreading amount of the emulsified asphalt is 1.5kg/m2-3kg/m2；
The penetration depth of the emulsified asphalt is 5-10 mm;
the content of evaporation residues of the emulsified asphalt is 50 to 90 percent;
the deflection value of the top surface of the roadbed is 50-90(0.01 mm).
2. The method of paving a combined base asphalt pavement according to claim 1, wherein the slow-breaking anionic emulsified asphalt strike-through layer is sprayed after the cement-modified soil or lime-modified soil is constructed.
3. The method for paving the asphalt pavement of the combined base layer according to claim 2, wherein before the construction of the viscoelastic fatigue-resistant cushion coat of the asphalt mixture, a modified hot asphalt or a modified emulsified asphalt bonding layer is pre-distributed on the emulsified asphalt permeable layer on the top surface of the roadbed.
4. The method for paving the combined base layer asphalt pavement according to claim 1, wherein the viscoelastic fatigue-resistant cushion coat asphalt mixture asphalt adopts 90 or 110 high-grade road petroleum asphalt.
5. The method of paving a modular base asphalt pavement as recited in claim 1, wherein the thickness of the base layer of the asphalt stabilized macadam is 10-18 cm.
6. The method of paving a modular base course asphalt pavement according to claim 1, wherein the semi-rigid lower base course has a thickness of 20-30cm and is constructed in a single layer.
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| 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 |
| CN111607240B (en) * | 2020-04-13 | 2022-06-24 | 佛山路桥养护有限公司 | Asphalt pavement regeneration sealing agent, preparation method thereof and asphalt pavement maintenance method |
| CN111549608A (en) * | 2020-04-23 | 2020-08-18 | 山东省交通科学研究院 | Anti-rutting pavement paving method capable of continuously paving base layer and surface layer |
| CN114182595B (en) * | 2021-11-19 | 2023-08-11 | 山东省交通科学研究院 | Construction method of long-life asphalt road |
| 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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| TWI474927B (en) * | 2009-01-06 | 2015-03-01 | Cytec Tech Corp | Structural composite material with improved acoustic and vibrational damping properties |
| CN101768914B (en) * | 2010-01-25 | 2011-07-06 | 重庆鹏方路面工程技术研究院有限公司 | Pavement structure for structure transfer and performance recovery of semi-rigid base asphalt pavement |
| CN202359478U (en) * | 2011-12-14 | 2012-08-01 | 长安大学 | Multifunctional environmentally-friendly road surface |
| CN104074115B (en) * | 2014-07-08 | 2016-08-17 | 山东省交通科学研究院 | A kind of Heavy Traffic pavement of road paving structure based on high stiffness modulus asphalt compound |
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