CN114182595B - Construction method of long-life asphalt road - Google Patents
Construction method of long-life asphalt road Download PDFInfo
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- CN114182595B CN114182595B CN202111408179.0A CN202111408179A CN114182595B CN 114182595 B CN114182595 B CN 114182595B CN 202111408179 A CN202111408179 A CN 202111408179A CN 114182595 B CN114182595 B CN 114182595B
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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) constructing a roadbed; (2) paving cement to improve soil; (3) spreading and rolling a single layer of crushed stone with large particle size; (4) spraying emulsified asphalt; (5) spraying hot asphalt; and (6) 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 life cycle, and only the surface wearing layer is needed to be repaired so as to meet the functional requirement. Greatly relieves the influence on road traffic caused by road maintenance and reconstruction.
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, the road in China still takes a semi-rigid base asphalt pavement as a main form of an asphalt road structure. Due to the shrinkage characteristic of the semi-rigid base material, reflection cracks with different degrees can be caused on the asphalt pavement, and the road is damaged. The semi-rigid base material can generate the phenomenon of pumping mud of the base under the comprehensive actions of running load, water and temperature gradient, gradually lose supporting capacity of the base, and finally generate the phenomenon of plate fracture under the repeated actions of the load. The designed fatigue life of the semi-rigid base asphalt road which is established in the longitudinal direction is 15 years, but the actual life is usually less than 1/2 of the designed life, the construction cost of 4 lanes per kilometer is estimated by a highway of 3 ten thousand kilometers, the construction cost is on average 2000 ten thousand yuan, 6000 hundred million yuan is consumed, the service life is reduced by half, the overhaul or reconstruction is required by 7-8 years in advance, and the average number of conservative calculation is 850 hundred million yuan per year. In addition, the overhaul requires a long time, is extremely unfavorable to the modern rapid and large-capacity traffic development, and the loss caused by the interruption or the influence on the traffic is also extremely serious. In addition, the waste road materials during road structural maintenance can cause serious pollution to the environment. Therefore, the problem of short service life of the existing asphalt road can be solved.
Disclosure of Invention
The invention aims to provide a construction method of a long-life asphalt road aiming at the defects, which changes the stress damage mode of the traditional semi-rigid base asphalt road surface and has the design service life of more than 35 years. Structural overhaul reconstruction is not needed in the life cycle, and only the surface wearing layer is needed to be repaired so as to meet the functional requirement. Greatly relieves the influence on road traffic caused by road maintenance and reconstruction.
The technical scheme of the invention is as follows: a construction method of a long-life asphalt road comprises the following steps:
(1) Constructing a roadbed;
(2) Paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; rechecking the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is smooth, and then sprinkling water for wetting; then adopting horizontal layering filling, and carrying out material distribution, mixing and rolling on the top surface of the roadbed;
(3) Spreading and rolling single-layer large-particle-size crushed stone: selecting granular broken stone with a certain particle size, sieving to remove super-particle size and fine particle components, removing dust, and performing single-layer spreading before cement initial setting time after the cement improvement soil pavement in the step (2) is completed, wherein the spreading amount of the broken stone is 15-20 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the After spreading, rolling according to the sequence of static pressure and vibration, low to high, slow and fast, controlling the rolling speed to be 1.8-2 km/h, and forming a crushed stone layer which is partially embedded into the top surface of the paved roadbed after rolling;
(4) Spraying emulsified asphalt: firstly, removing floating broken stone of a broken stone layer, then spraying emulsified asphalt in a state that the cement improves the soil surface wetting, wherein the sprayed emulsified asphalt is uniformly atomized, and uniformly distributed thin layers are formed on the roadbed and the broken stone layer surface; the emulsified asphalt after spraying has a penetration depth of at least 10mm and is connected with the crushed stone layer and the top surface of the roadbed into a whole; after the emulsified asphalt is sprayed, stabilizing and preserving for at least 7 days; wherein the emulsified asphalt is sprayed in an amount of at least 1.5kg/m 2 ；
(5) Spraying hot asphalt: spraying hot asphalt on the crushed stone layer stabilized by the emulsified asphalt after stabilizing and preserving the health; the sprinkling amount of the hot asphalt is 1.6-2.0 kg/m 2 Temperature of hot asphalt150-170 ℃; the curing time of the hot asphalt is 12-24 hours;
(6) Paving an asphalt mixture layer: after the hot asphalt reaches the curing time requirement, paving asphalt mixture layers in layers; the asphalt mixture layer is formed by combining an anti-fatigue layer, a connecting layer, a lower layer, a middle surface layer and an upper surface layer from bottom to top.
In the step (3) of the construction method of the long-life asphalt road, the nominal particle size of the broken stone is more than twice of the nominal maximum particle size of the asphalt mixture aggregate of the upper layer paving 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-cracking anionic or nonionic emulsified asphalt.
In the construction method of the long-life asphalt road, the emulsified asphalt 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.
In the construction method of the long-life asphalt road, the modified asphalt is SBS modified asphalt.
In the construction method of the long-life asphalt road, the anti-fatigue layer, the connecting layer, the lower layer, the middle surface layer and the upper layer in the step (6) are respectively paved by different asphalt mixtures with specific functions, and the total thickness is 30-40cm.
The beneficial effects of the invention are as follows: according to the construction method, firstly, the bearing capacity of the soil is improved through cement to strengthen the top surface of the road foundation, and fatigue damage of an asphalt layer is effectively controlled; then, a single-layer large-particle-size broken stone is scattered and rolled to form a broken stone layer similar to a bidirectional saw-tooth shape, the cohesive force between the roadbed and a subsequent asphalt mixture layer is enhanced, sliding between the roadbed and the road surface is prevented, the integrity and the cracking resistance of the stress of the road structure are further enhanced, the typical diseases such as thermal shrinkage cracks, semi-rigid base road reflection cracks and road fatigue cracks under heavy traffic of an asphalt road surface are solved, the fatigue cracking and structural rutting of the asphalt layer are avoided, the road service performance is remarkably improved, the road traffic capacity is improved, and the service life of the road structure is effectively prolonged. In addition, emulsified asphalt and hot asphalt are sprayed on the crushed stone layer step by step, so that the emulsified asphalt stabilizes crushed stone on one hand, water retention and maintenance can be carried out on cement improvement soil on the other hand, and moisture retention is carried out without additional cloth laying, thereby saving time and labor. The asphalt mixture further reinforces the gravel layer, forms a waterproof layer between the roadbed and the road surface, prevents the roadbed from being washed by the water on the surface of the roadbed, and simultaneously prevents the road surface from being damaged due to the rising of the capillary water on the roadbed, thereby playing a bidirectional waterproof function. And finally, paving a pavement structure layer formed by combining asphalt mixtures with different functions, wherein the pavement performance can be improved, and a cement stabilized macadam base layer is not arranged, 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 avoided.
The construction method has the advantages that through comprehensive design in all directions at multiple angles, the use performance of the road is obviously improved, the service life of the road surface structure is effectively prolonged, the maintenance period is prolonged, the engineering cost is reduced, the consumption of road building materials such as sand and stone is reduced, the investment and resource consumption are saved, and the cost of the whole life cycle 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 (4 cm) can be used for functional maintenance at intervals of about 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 pavement structure has the advantages of optimal cost performance, capability of greatly reducing the generation of maintenance waste and saving huge rebuilding cost. The method reduces the consumption of road building materials such as sand and stone materials, saves the investment and resource consumption, greatly reduces the cost of the whole life cycle, has important significance for protecting the ecological environment, meets the requirements of green roads, and has obvious economic and social benefits.
Taking a high-speed reconstruction and expansion project as an example, the full length of the highway is 15.7km, the highway is a bidirectional eight-lane highway, the design speed is 120km/h, and the standard roadbed width is 34.5m. The construction method is used successfully in the high-speed construction, the construction is simple and convenient, the operability is strong, the construction period can be greatly shortened, and various use performance indexes of the road are good.
Taking a high speed as an example, the total mileage is 37.758km. The design speed of the main road is 120km/h, and the two-way six-lane highway is standard. The construction method is successfully applied for 5 km, the construction is simple and convenient, the operability is strong, the construction period can be greatly shortened, the quality can be effectively ensured, and the construction method has certain popularization and application values. By using the construction method, the construction period is shortened by 40 days, the labor is saved by 22%, the total cost is saved by 126 ten thousand yuan, the typical diseases such as asphalt pavement thermal shrinkage cracks, semi-rigid base pavement reflection cracks, pavement structural rutting and fatigue cracks under heavy traffic are solved, the road service performance is obviously improved, and certain economic, social and environmental benefits are realized.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The construction method of the long-life asphalt road comprises the following steps:
(1) Constructing a roadbed;
(2) Paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; rechecking the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is smooth, and then sprinkling water for wetting; then adopting horizontal layering filling, and carrying out material distribution, mixing and rolling on the top surface of the roadbed; the specific operation is as follows:
a. the raw material index: the cement-improved soil layer is prepared by selecting gravel soil with better grading as roadbed filler, wherein the maximum grain diameter is 53mm, the soil uniformity coefficient is 13, the liquid limit is 35, the plasticity index is not more than 10, and the organic matter content is less than 1.1%.
b. The cement improves the soil performance index: the design 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 deflection value of the Beckman beam is 73. The cement dosage of the cement-improving soil is 6 percent (mass percent), and the representative value of the unconfined compressive strength of the stable soil indoor 7 days is 1.8MPa.
c. The construction method comprises the following steps: when in construction, 4X 4m square grids are adopted, gray lines are spread, 7 bags of cement are distributed according to the cement consumption calculation, and then the cement is uniformly spread in the grid lines by a buckling method. After the ash distribution is completed, the road mixer is adopted for mixing for more than two times, so that the mixing depth of the road mixer can be ensured to invade the lower layer by 1-2cm, the mixture is uniform, and no interlayer is left. After the mixing is completed, a single steel wheel road roller is adopted for vibration rolling for 4 times to reach the specified compactness.
(3) Spreading and rolling single-layer large-particle-size crushed stone: selecting limestone gravels with nominal grain size of 9.6-19 mm, sieving to remove the components of super diameter and fine particles and dust to dust content of 0.1%, performing single-layer spreading after the cement improvement soil pavement in the step (2) is completed and before the cement initial setting time, and adopting a professional gravels spreading vehicle, wherein the gravels spreading amount is 20kg/m 2 The crushed stone coverage rate was 100% and there was no overlap. The static pressure of a 26T Shan Gang wheel road roller is adopted for 2 times, then the rolling is carried out in the order of vibration, low position to high position, slow speed and fast speed, and the rolling speed is controlled to be 1.8-2 km/h. Hole digging detection is carried out according to the frequency of 5 parts per 10000 square meters in the construction process, and the embedding depth of broken stone is tested; and forming a bi-directional serrated crushed stone layer after rolling. Wherein the mass technical requirements of the selected crushed stone are shown in table 1.
TABLE 1 lithotripsy quality specification
(4) Spraying emulsified asphalt: firstly, removing floating broken stone, then grinding in the embedded broken stone layerAfter the compaction is finished, spraying the cement in a state of improving the soil surface wetting, wherein the sprayed emulsified asphalt is uniformly atomized, and uniformly distributed thin layers are formed on the surfaces of the roadbed and the crushed stone layer; and hole digging detection is carried out according to the frequency of 5 parts per 10000 square meters in the construction process. The depth of penetrating layer oil into the base layer is less than 10mm, and the penetrating layer oil is connected with the top surface of the gravel layer and the roadbed into a whole; after the emulsified asphalt is sprayed, stabilizing and preserving for at least 7 days; wherein the emulsified asphalt is PC-2 emulsified asphalt. The spraying amount of the emulsified asphalt is 3.3L/m 2 The penetration depth of the emulsified asphalt is about 12mm. The main technical indexes of the PC-2 emulsified asphalt respectively accord with the requirements of Table 2.
Table 2 quality specifications of PC-2 penetrating emulsified asphalt
(5) Spraying hot asphalt: spraying hot asphalt on the crushed stone layer stabilized by the emulsified asphalt after stabilizing and preserving the health; the hot asphalt is SBS modified asphalt, and the technical indexes are shown in Table 3. The distribution amount of the hot asphalt is 1.8kg/m 2 The temperature of the hot asphalt is 150-170 ℃; the curing time of the hot asphalt is 12-24 hours.
Table 3: SBS modified asphalt quality technical requirement
(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 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 requirement of the asphalt mixture meets the requirement of various hot-mix asphalt mixtures in the technical Specification for construction of Highway asphalt pavement (JTG F40-2004).
Claims (9)
1. The construction method of the long-life asphalt road is characterized by comprising the following steps of:
(1) Constructing a roadbed;
(2) Paving cement to improve soil: firstly, determining the cement consumption and the treatment depth required for meeting the design load requirement; rechecking the roadbed to ensure that the bearing capacity of the lower bearing layer meets the requirement and is smooth, and then sprinkling water for wetting; then adopting horizontal layering filling, and carrying out material distribution, mixing and rolling on the top surface of the roadbed;
(3) Spreading and rolling single-layer large-particle-size crushed stone: selecting granular broken stone with a certain particle size, sieving to remove super-particle size and fine particle components, removing dust, and performing single-layer spreading before cement initial setting time after the cement improvement soil pavement in the step (2) is completed, wherein the spreading amount of the broken stone is 15-20 kg/m 2 The method comprises the steps of carrying out a first treatment on the surface of the After spreading, rolling according to the sequence of static pressure and vibration, low to high, slow and fast, controlling the rolling speed to be 1.8-2 km/h, and forming a bidirectional saw-tooth-shaped crushed stone layer after rolling;
(4) Spraying emulsified asphalt: firstly, removing floating broken stone of a broken stone layer, then spraying emulsified asphalt in a state that the cement improves the soil surface wetting, wherein the sprayed emulsified asphalt is uniformly atomized, and uniformly distributed thin layers are formed on the roadbed and the broken stone layer surface; the emulsified asphalt after spraying has a penetration depth of at least 10mm and is connected with the crushed stone layer and the top surface of the roadbed into a whole; after the emulsified asphalt is sprayed, stabilizing and preserving for at least 7 days; wherein the emulsified asphalt is sprayed in an amount of at least 1.5kg/m 2 ；
(5) Spraying hot asphalt: spraying hot asphalt on the crushed stone layer stabilized by the emulsified asphalt after stabilizing and preserving the health; the sprinkling amount of the hot asphalt is 1.6-2.0 kg/m 2 The temperature of the hot asphalt is 150-170 ℃; the curing time of the hot asphalt is 12-24 hours;
(6) Paving an asphalt mixture layer: after the hot asphalt reaches the curing time requirement, paving asphalt mixture layers in layers; the asphalt mixture layer is formed by combining an anti-fatigue layer, a connecting layer, a lower layer, a middle surface layer and an upper surface layer from bottom to top;
the asphalt mixture layer is a pavement structure layer, and the pavement structure layer is not provided with a cement stabilized macadam base layer.
2. The construction method of long-life asphalt road according to claim 1, wherein the nominal particle size of the crushed stone in the step (3) is more than twice the nominal maximum particle size of the anti-fatigue layer asphalt mixture aggregate paved on the upper layer.
3. The construction method of long-life asphalt road according to claim 1, wherein the crushed stone in the step (3) is limestone crushed stone or steel slag.
4. The construction method of long life asphalt road according to claim 1, wherein the emulsified asphalt in the step (4) is slow-cracking anionic or nonionic emulsified asphalt.
5. The construction method for long life asphalt road according to claim 4, wherein said emulsified asphalt is PC-2 or PA-2 emulsified asphalt.
6. The construction method of long-life asphalt road according to claim 1, wherein the spray pipe forms an angle of 30 ° with the top surface of the subgrade when emulsified asphalt is sprayed in the step (4).
7. The construction method for long-life asphalt road according to claim 1, wherein the medium heat asphalt in the step (5) is modified asphalt.
8. The construction method for long life asphalt road according to claim 7, wherein said modified asphalt is SBS modified asphalt.
9. The construction method of long life asphalt road according to claim 1, wherein the total thickness of the asphalt mixture layer in the step (6) is 30-40cm.
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