CN114182595A - Construction method of long-life asphalt road - Google Patents
Construction method of long-life asphalt road Download PDFInfo
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- CN114182595A CN114182595A CN202111408179.0A CN202111408179A CN114182595A CN 114182595 A CN114182595 A CN 114182595A CN 202111408179 A CN202111408179 A CN 202111408179A CN 114182595 A CN114182595 A CN 114182595A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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Abstract
The invention belongs to the technical field of road construction, and particularly relates to a construction method of a long-life asphalt road. The construction method comprises the following steps: (1) building a roadbed; (2) paving cement to improve soil; (3) spreading and rolling single-layer large-particle-size crushed stone; (4) spraying emulsified asphalt; (5) spraying hot asphalt; (6) and paving an asphalt mixture layer. The construction method changes the stress damage mode of the traditional semi-rigid base asphalt pavement, and the design service life can reach more than 35 years. Structural overhaul reconstruction is not needed in the service life cycle, and only the surface wearing layer is needed to be repaired to meet the functional requirement. The influence on road traffic caused by pavement maintenance and reconstruction is greatly relieved.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a construction method of a long-life asphalt road.
Background
At present, roads in China still use semi-rigid base asphalt pavements as main forms of asphalt road structures. Due to the shrinkage characteristics of the semi-rigid base material, reflective cracks of the asphalt pavement can be caused to exist in different degrees, and the damage to the pavement is caused. The semi-rigid base material can generate a base layer sludging phenomenon under the comprehensive action of traffic load, water and temperature gradient, so that the base layer gradually loses the supporting capacity, and finally the plate fracture phenomenon is generated under the repeated action of load. The design fatigue life of the constructed semi-rigid base asphalt road is 15 years, but the actual life is usually less than 1/2 of the design life, the construction cost of 4 lanes per kilometer is 2000 ten thousand yuan on average, the cost is 6000 million yuan, the life is reduced by half, the major repair or reconstruction is needed 7-8 years ahead, and the average annual conservative calculation cost is 850 million yuan. In addition, major repairs require a long time, are extremely detrimental to modern rapid and high volume traffic development, and the losses caused by traffic interruptions or impacts are equally severe. In addition, the road material discarded in the road structural repair causes serious pollution to the environment. Therefore, how to construct the asphalt road needs to be solved to overcome the problem of short service life of the existing asphalt road.
Disclosure of Invention
The invention aims to provide a construction method of a long-life asphalt road aiming at the defects, the construction method changes the stress damage mode of the traditional semi-rigid base asphalt pavement, and the design service life can reach more than 35 years. Structural overhaul reconstruction is not needed in the service life cycle, and only the surface wearing layer is needed to be repaired to meet the functional requirement. The influence on road traffic caused by pavement maintenance and reconstruction is greatly relieved.
The technical scheme of the invention is as follows: a construction method of a long-life asphalt road comprises the following steps:
(1) building a roadbed;
(2) paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; re-inspecting the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is flat and moist by sprinkling water; then horizontal layered filling is adopted, and material distribution, mixing and rolling are carried out on the top surface of the roadbed;
(3) spreading and rolling single-layer large-particle-size crushed stones: selecting granular crushed stone with a certain particle size, screening out super-particle size and fine particle components, removing dust, and performing single-layer spreading before the initial setting time of cement after the cement improved soil in the step (2) is paved, wherein the spreading amount of the crushed stone is 15-20 kg/m2(ii) a After the spreading is finished, rolling is carried out according to the sequence of static pressure first, vibration second, slow first and fast second from a low position to a high position, the rolling speed is controlled to be 1.8-2 km/h, and a gravel layer partially embedded into the top surface of the paved road bed is formed after the rolling is finished;
(4) spraying emulsified asphalt: headFirstly, removing floating gravels on the gravel layer, and then spraying emulsified asphalt under the condition that the surface of the cement-improved soil is wet, wherein the sprayed emulsified asphalt is in a uniform and vaporous state, and uniformly distributed thin layers are formed on the surfaces of the roadbed and the gravel layer; the penetration depth of the sprayed emulsified asphalt is at least 10mm, and the emulsified asphalt is connected with the gravel layer and the top surface of the roadbed into a whole; after the emulsified asphalt is sprayed, stably maintaining for at least 7 days; wherein the spraying amount of the emulsified asphalt is at least 1.5kg/m2；
(5) Spraying hot asphalt: after stable maintenance, spraying hot asphalt on the crushed stone layer with stable emulsified asphalt; the spreading amount of the hot asphalt is 1.6-2.0 kg/m2The temperature of the hot asphalt is 150-170 ℃; the hot asphalt curing time is 12-24 h;
(6) paving an asphalt mixture layer: after the hot asphalt meets the curing time requirement, paving an asphalt mixture layer in a layered manner; the asphalt mixture layer is composed of an anti-fatigue layer with a certain thickness, a connecting layer, a lower surface layer, a middle surface layer and an upper surface layer from bottom to top.
In the construction method of the long-life asphalt road, in the step (3), the nominal particle size of the crushed stone is more than twice of the maximum nominal particle size of the asphalt mixture aggregate of the upper-layer paved anti-fatigue layer.
In the construction method of the long-life asphalt road, the broken stone in the step (3) is limestone broken stone, steel slag or other alkaline aggregates.
In the construction method of the long-life asphalt road, the emulsified asphalt in the step (4) is slow-crack anionic or nonionic emulsified asphalt.
The emulsified asphalt in the construction method of the long-life asphalt road is PC-2 or PA-2 emulsified asphalt.
In the construction method of the long-life asphalt road, the spray pipe forms an angle of 30 degrees with the top surface of the roadbed when the emulsified asphalt in the step (4) is sprayed.
In the construction method of the long-life asphalt road, the hot asphalt in the step (5) is modified asphalt.
The modified asphalt in the construction method of the long-life asphalt road is SBS modified asphalt.
In the construction method of the long-life asphalt road, the anti-fatigue layer, the connecting layer, the lower surface layer, the middle surface layer and the upper surface layer in the step (6) are respectively paved by different asphalt mixtures with specific functions, and the total thickness is 30-40 cm.
The invention has the beneficial effects that: according to the construction method, the bearing capacity of the top surface of the roadbed is enhanced through the cement improved soil, so that the asphalt layer is effectively controlled to generate fatigue failure; then, a single-layer large-particle-size crushed stone is spread and rolled to form a crushed stone layer similar to a bidirectional saw-tooth shape, so that the adhesive force between the roadbed and a subsequent asphalt mixture layer is enhanced, the sliding between the roadbed and the pavement is prevented, the stress integrity and the crack resistance of the road structure are further enhanced, typical diseases such as temperature shrinkage cracks of the asphalt pavement, semi-rigid base pavement reflection cracks and pavement fatigue cracks under heavy traffic are solved, the fatigue cracks and structural rutting of the asphalt layer are avoided, the road use performance is remarkably improved, the road traffic capacity is improved, and the service life of the road structure is effectively prolonged. In addition, spray emulsified asphalt and hot pitch step by step on the metalling, emulsified asphalt stabilizes the rubble on the one hand, and on the other hand can improve the soil to cement and protect water maintenance, need not additionally to lay cloth and moisturize labour saving and time saving. The hot asphalt further reinforces the gravel layer, and a waterproof layer is formed between the roadbed and the road surface to prevent the road surface moisture from infiltrating downwards to wash the roadbed, and simultaneously prevent the roadbed capillary moisture from rising to cause the damage of the road surface, thereby achieving the function of bidirectional waterproofing. And finally, paving a pavement structure layer formed by combining asphalt mixtures with different functions, which can improve the pavement performance, without a cement stabilized macadam base layer, so that the total thickness of the pavement structure is reduced by more than 30cm, stone resources are saved, the construction period is greatly shortened, and the problem of reflection cracks caused by cracking of cement stabilized macadams is solved.
The construction method has the advantages that the construction method is comprehensively designed in a multi-angle and omnibearing manner, the rings are buckled, the service performance of the road is obviously improved, the service life of the pavement structure is effectively prolonged, the maintenance period is prolonged, the construction cost is reduced, the consumption of road building materials such as sand and stone materials is reduced, the capital investment and the resource consumption are saved, and the whole life cycle cost is greatly reduced.
The road paved by the construction method can be ensured to be used for at least 35-50 years, only the surface layer (4cm) is functionally maintained every 8-12 years, and the pavement structure can be used for a long time. Compared with the traditional pavement structure which needs to be overhauled every 10 years and periodically rebuilt at the end of the design period (15 years), the cost performance is optimal, the generation of maintenance waste can be greatly reduced, and huge rebuilding cost is saved. The consumption of road building materials such as sand and stone materials is reduced, the capital investment and the resource consumption are saved, the whole life cycle cost is greatly reduced, the ecological environment is protected, the requirement of a green road is met, and the economic and social benefits are remarkable.
Taking a certain high-speed reconstruction and extension project as an example, the total length is 15.7km, the designed speed is 120km/h, and the standard roadbed width is 34.5 m. The construction method is successfully applied to the high-speed construction, the construction is simple and convenient, the operability is strong, the construction period can be greatly shortened, various service performance indexes of roads are good, the construction period is shortened by 70 days by applying the construction method, the labor is saved by 25%, no crack is generated on the road surface, the service life of the road surface structure is effectively prolonged, the maintenance and repair period is prolonged, the construction cost is reduced, the cost is saved by more than 1000 ten thousand yuan, and certain economic, social and environmental benefits are achieved.
Taking a certain high speed as an example, the mileage is 37.758km in full length. The main road design speed is 120km/h, and the two-way six-lane highway standard is adopted. The construction method is successfully applied for 5 kilometers, the construction is simple and convenient, the operability is strong, the construction period can be greatly shortened, the quality can be effectively guaranteed, and the method has certain popularization and application values. By the application of the construction method, the construction period is shortened by 40 days, the labor is saved by 22 percent, the cost is saved by 126 ten thousand yuan, the typical diseases of warm shrinkage cracks of asphalt pavements, reflection cracks of semi-rigid base pavements, structural ruts and fatigue cracks of pavements under heavy traffic and the like are solved, the service performance of roads is obviously improved, and the construction method has certain economic, social and environmental benefits.
Detailed Description
The present invention will be described in detail below with reference to examples.
Example 1
The construction method of the long-life asphalt road comprises the following steps:
(1) building a roadbed;
(2) paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; re-inspecting the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is flat and moist by sprinkling water; then horizontal layered filling is adopted, and material distribution, mixing and rolling are carried out on the top surface of the roadbed; the specific operation is as follows:
a. raw material indexes are as follows: 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%.
b. The performance index of the cement for improving soil is as follows: 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.
c. The construction method comprises the following steps: 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. After the mixing is finished, a single steel wheel road roller is adopted to carry out vibration rolling for 4 times, and the specified compaction degree is achieved.
(3) Spreading and rolling single-layer large-particle-size crushed stones: selecting limestone macadam with nominal grain diameter of 9.6-19 mm, screening out oversize and fine grain components, removing dust until the dust content is 0.1%, performing single-layer spreading before the initial setting time of cement in the step (2) after paving the cement-improved soil, and adopting a special macadam spreading vehicle, wherein the spreading amount of the macadam is 20kg/m2The rubble coverage was 100% with no overlap. And (3) carrying out static pressure 2 times by adopting a 26T single rigid wheel road roller, then vibrating, rolling from a low position to a high position, and rolling slowly and quickly, wherein the rolling speed is controlled to be 1.8-2 km/h. In the construction process, digging holes at 5 positions per 10000 square meters for detection, and testing the embedding depth of the crushed stones; and forming a bidirectional zigzag crushed stone layer after rolling. It is composed ofThe quality technical requirements of the selected macadam are shown in table 1.
TABLE 1 crushed stone quality technical requirements
(4) Spraying emulsified asphalt: firstly, removing floating gravels, then spraying cement under the condition of improving the soil surface wetting state after the embedded gravel layer is rolled, wherein the sprayed emulsified asphalt is in a uniform and vaporous state, and uniformly distributed thin layers are formed on the surfaces of the roadbed and the gravel layer; and digging holes at the frequency of 5 parts per 10000 square meters in the construction process for detection. The depth of the penetration layer oil penetrating into the base layer has to be less than 10mm, and the penetration layer oil is connected with the gravel layer and the top surface of the roadbed into a whole; after the emulsified asphalt is sprayed, stably maintaining for at least 7 days; wherein the emulsified asphalt is PC-2 emulsified asphalt. The spraying amount of the emulsified asphalt is 3.3L/m2The penetration depth of the emulsified asphalt is about 12 mm. The main technical indexes of the PC-2 emulsified asphalt respectively meet the requirements of the table 2.
TABLE 2PC-2 technical requirements for quality of permeable emulsified asphalt
(5) Spraying hot asphalt: after stable maintenance, spraying hot asphalt on the crushed stone layer with stable emulsified asphalt; the hot asphalt is SBS modified asphalt with the technical indexes as shown in Table 3. The spreading amount of the hot asphalt was 1.8kg/m2The temperature of the hot asphalt is 150-170 ℃; the curing time of the hot asphalt is 12-24 hours.
Table 3: quality technical requirements of SBS modified asphalt
(6) Paving an asphalt mixture layer: the asphalt mixture layer is formed by combining a FAC-13 anti-fatigue layer with the thickness of 6cm, an AC-25 connecting layer with the thickness of 12cm, an AC-25 lower surface layer with the thickness of 12cm, an AC-20 middle surface layer with the thickness of 6cm and an SMA-13 upper surface layer with the thickness of 4cm from bottom to top. The technical requirements of the method should meet the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) on various hot-mixed asphalt mixtures.
Claims (9)
1. The construction method of the long-life asphalt road is characterized by comprising the following steps:
(1) building a roadbed;
(2) paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; re-inspecting the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is flat and moist by sprinkling water; then horizontal layered filling is adopted, and material distribution, mixing and rolling are carried out on the top surface of the roadbed;
(3) spreading and rolling single-layer large-particle-size crushed stones: selecting granular crushed stone with a certain particle size, screening out super-particle size and fine particle components, removing dust, and performing single-layer spreading before the initial setting time of cement after the cement improved soil in the step (2) is paved, wherein the spreading amount of the crushed stone is 15-20 kg/m2(ii) a After the spreading is finished, rolling is carried out according to the sequence of static pressure first, vibration second, slow first and fast second from a low position to a high position, the rolling speed is controlled to be 1.8-2 km/h, and a gravel layer partially embedded into the top surface of the paved road bed is formed after the rolling is finished;
(4) spraying emulsified asphalt: firstly, removing floating gravels on the gravel layer, then spraying emulsified asphalt under the condition that the surface of the cement-improved soil is wet, wherein the sprayed emulsified asphalt is uniform and vaporous, and uniformly distributed thin asphalt is formed on the surfaces of the roadbed and the gravel layerA layer; the penetration depth of the sprayed emulsified asphalt is at least 10mm, and the emulsified asphalt is connected with the gravel layer and the top surface of the roadbed into a whole; after the emulsified asphalt is sprayed, stably maintaining for at least 7 days; wherein the spraying amount of the emulsified asphalt is at least 1.5kg/m2；
(5) Spraying hot asphalt: after stable maintenance, spraying hot asphalt on the crushed stone layer with stable emulsified asphalt; the spreading amount of the hot asphalt is 1.6-2.0 kg/m2The temperature of the hot asphalt is 150-170 ℃; the hot asphalt curing time is 12-24 h;
(6) paving an asphalt mixture layer: after the hot asphalt meets the curing time requirement, paving an asphalt mixture layer in a layered manner; the asphalt mixture layer is composed of an anti-fatigue layer with a certain thickness, a connecting layer, a lower surface layer, a middle surface layer and an upper surface layer from bottom to top.
2. The construction method of the long-life asphalt road as claimed in claim 1, wherein the nominal grain size of the crushed stones in step (3) is more than twice the nominal maximum grain size of the asphalt mixture aggregate of the anti-fatigue layer paved on the upper layer.
3. The construction method of the long-life asphalt road as claimed in claim 1, wherein the crushed stone in the step (3) is limestone crushed stone or steel slag.
4. The method for constructing a long-life asphalt road as claimed in claim 1, wherein the emulsified asphalt in the step (4) is slow-breaking anionic or nonionic emulsified asphalt.
5. The method for constructing a long-life asphalt road according to claim 4, wherein the emulsified asphalt is PC-2 or PA-2 emulsified asphalt.
6. The method for constructing a long-life asphalt road according to claim 1, wherein the emulsified asphalt in the step (4) is sprayed with a nozzle having an angle of 30 ° with respect to the roadbed top surface.
7. The method for constructing a long-life asphalt road as claimed in claim 1, wherein the hot asphalt in step (5) is modified asphalt.
8. The method of constructing a long-life asphalt road according to claim 7, wherein the modified asphalt is SBS modified asphalt.
9. The construction method of the long-life asphalt road as claimed in claim 1, wherein the total thickness of the asphalt mixture layer in the step (6) is 30-40 cm.
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Cited By (1)
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