CN111455770A - Asphalt pavement splicing structure based on recycled materials and construction method thereof - Google Patents
Asphalt pavement splicing structure based on recycled materials and construction method thereof Download PDFInfo
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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
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- 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
- E01C7/187—Repairing bituminous covers, e.g. regeneration of the covering material in situ, application of a new bituminous topping
-
- 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
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
A new road structure layer and an old road structure layer are of step-shaped structures, the splicing structure comprises a geogrid layer, a water-stable cold regeneration underlayer, a water-stable lower base layer, a water-stable upper base layer, a glass fiber grid layer, an emulsified asphalt plant-mixed cold regeneration base layer and an AC-25 lower base layer which are sequentially laid from bottom to top, the contact surfaces of the water-stable cold regeneration underlayer, the water-stable lower base layer and the water-stable upper base layer with the new road structure layer and the old road structure layer are provided with V-shaped grooves, and cement paste and fine aggregates for ensuring that the splicing structure is firmly bonded with the new road structure layer and the old road structure layer are filled in the V-shaped grooves. The invention carries out milling and recovery on the old road water-stable material, forms a new water-stable cold regeneration subbase layer mixture by crushing, screening and doping new aggregate, can greatly reduce the exploitation of nonrenewable resources and simultaneously solves the problem that the waste building material occupies land resources for a long time.
Description
Technical Field
The invention relates to the field of road construction, and particularly belongs to a recycled material-based asphalt pavement splicing structure and a construction method thereof.
Background
With the high-speed development of economy in China, the traffic flow is increased day by day, the pavement structure layer of the highway built in early stage is damaged in different degrees, and in the reconstruction and expansion project of the highway, because the hard shoulder structure layer of the old road is different from the traffic lane, in order to prolong the service life of the road, the hard shoulder structure layer of the old road is subjected to reverse excavation treatment, so that the newly-built pavement structure layer is firmly combined with the old pavement structure layer. After reverse excavation, the foundation trench is deep, the channel is long and narrow, the efficiency of the original construction process is low, and the new trend requirements cannot be met.
Therefore, a construction method is urgently needed to improve the construction efficiency and the splicing quality in the stable splicing treatment process of the reverse excavation water.
Disclosure of Invention
The invention aims to provide a recycled material-based asphalt pavement splicing structure and a construction method thereof, and aims to solve the technical problem of low construction efficiency in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a bituminous paving mosaic structure based on recycled material, new road structure layer and old road structure layer are step-like structure with mosaic structure contact surface, its characterized in that: the mosaic structure includes geotechnique's grid layer, the steady cold regeneration underlayment of water, steady basic unit, the steady upper base layer of water, fine glass grid layer, the steady cold regeneration basic unit of emulsified asphalt plant mixing and AC-25 lower surface course of laying in order from bottom to top, steady cold regeneration underlayment of water, steady lower basic unit of water and steady upper base layer of water all are equipped with V type slot with the contact surface of new road structure layer and old road structure layer, V type slot intussuseption is filled with and is used for guaranteeing that mosaic structure and new road structure layer and old road structure layer bond firm cement paste and fine aggregate.
Further preferably, the water-stable cold regeneration subbase layer, the water-stable lower base layer, the water-stable upper base layer, the emulsified asphalt plant-mixed cold regeneration base layer and the lower layer of the AC-25 are respectively corresponding to a layer of step and have the same height as the corresponding step.
Further, the thickness of the plant-mixed cold-recycling base layer of the emulsified asphalt is 10-12 cm, and the thickness of both the water-stable lower base layer and the water-stable upper base layer is 18-20 cm; the particle size of the fine aggregate is 0-5 mm.
A construction method of a bituminous pavement splicing structure based on a recycled material is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step one, constructing a water stable-cooling regeneration subbase layer, laying a layer of HDPE geogrid on the top surface of the subbase layer to form a geogrid layer after the roadbed at the splicing structure is qualified by inspection, and then specifically comprising the following steps:
step a: uniformly spraying cement paste on the vertical surfaces of the steps on the two sides of the new road and the old road, laying a water stop belt on the vertical surfaces of the steps on the two sides, uniformly laying fine aggregates on the vertical surface on the outer side of the water stop belt, wherein the laying height is 1/2 step height and is in the shape of an isosceles right triangle;
step b: paving a water stable-cooling regeneration subbase layer mixture to form a water stable-cooling regeneration subbase layer, compacting after the water stable-cooling regeneration subbase layer is paved, wherein the compaction is not performed at a distance of 30cm from steps on two sides during rolling, a V-shaped groove with the depth of 8-10 cm is excavated at a joint of a new road and an old road, then cement paste is poured, the pouring amount is proper to prevent the cement paste from seeping downwards, and after the cement paste is poured, the V-shaped groove is filled with fine aggregate;
step c: the reserved 30cm is firstly subjected to static pressure once by using a road roller, then the road roller is used for compacting in a mode of rolling for 10cm each time, the water-cooling-stable regeneration mixture is gradually extruded to the vertical surface of the step, the road roller cannot be pressed on the step in the rolling process, and the place which cannot be pressed by the road roller is manually tamped by using a skin hammer; covering in time after the construction of the water-cooling-stable regeneration subbase layer is finished, and watering for curing;
step two, constructing a water-stable lower base course, cleaning the lower bearing course before construction, and spraying a layer of cement paste with a water-cement ratio of 1:2, wherein the spraying amount is 2.0-3.0 kg/square meter, and the concrete steps are as follows:
step d: the same as step a;
step e: b, paving a water-stable lower base layer mixture to form a water-stable lower base layer, and after paving the water-stable lower base layer, finishing paving the water-stable cold regeneration base layer in the step b;
step f: the same step as step c;
step three, constructing a water-stabilized upper base layer, and synchronously performing step two;
constructing an emulsified asphalt plant-mixed cold-recycling base course, spraying emulsified asphalt prime coat oil in time after the construction of a water-stabilized upper base course is finished, wherein the spraying amount is 1.55L/square meter, and the two side edges of the prime coat oil are tightly covered by plastic films;
step five: constructing the following layer of AC-25: mixing and stirring the mixture of the lower layer of the AC-25, stirring by adopting an intermittent asphalt mixer, wherein the stirring time of each disc is 45s, thoroughly cleaning the lower bearing layer and step sundries before the lower layer is paved, uniformly coating emulsified asphalt on the side surface of the step to ensure that the new and old structural layers are firmly bonded, then paving the mixture of the lower layer of the AC-25 by adopting an asphalt paver to form the lower layer of the AC-25, paving the emulsified asphalt plant-mixed cold-recycled base layer in the same step five, completely and naturally cooling the paved layer, and opening the traffic when the surface temperature of the mixture is lower than 50 ℃.
Further, the loose paving coefficient of the water stable-cooling regeneration subbase layer in the step one is 1.26, and the water stable-cooling regeneration subbase layer mixture comprises the following components, 10-20 mm coarse aggregate: 15 parts by weight; milling and planing materials stably in water of 10-30 mm: 32 parts by weight; 5-10 mm water stable milling material: 24 parts by weight; 29 parts of 0-5mm fine aggregate; 3.2 parts by weight of cement; the water-stable milling material is prepared from recovered old pavement materials through crushing and screening, and the water-cement ratio of the cement paste is 1: 1.
Further, in the second step, the loose coefficient of the water-stable lower base layer is 1.30, and the water-stable lower base layer material mixture comprises the following components: 20-30 mm coarse aggregate, 23 parts by weight; 29 parts by weight of 10-20 mm coarse aggregate; 5-10 parts of coarse aggregate and 20 parts of a binder; 0-5mm coarse aggregate, 28 parts by weight; 4.3 parts of cement.
Further, the emulsified asphalt plant-mixed cold-recycling base layer mixture comprises the following components: 41 parts by weight of 10-20 mm asphalt milling material; 19 parts by weight of 5-10 mm asphalt milling material and 27 parts by weight of 0-5mm asphalt milling material; 10-20 parts of coarse aggregate by weight; 3 parts of mineral powder; 1.5 parts by weight of cement; 3.8 parts of emulsified asphalt; 3.3 parts by weight of water.
Further, in the step five, the mixture of the lower layer of AC-25 comprises the following components: 18 parts of 20-30 mm coarse aggregate; 10-20 mm coarse aggregate, 30 parts by weight; 21 parts of 5-10 mm coarse aggregate; 4 parts of 3-5 mm fine aggregate; 0-3 parts of fine aggregate and 24 parts of cement; 3 parts of mineral powder.
Further, in the fourth step, an asphalt paver is adopted to pave the emulsified asphalt plant-mixed cold-recycling base layer mixture to form a construction emulsified asphalt plant-mixed cold-recycling base layer, and the method specifically comprises the following steps:
step g: the asphalt paver is adopted for paving, sufficient feeding is ensured in the paving process, the next vehicle can feed in time after the previous vehicle is completely unloaded, and the condition that the vehicle is stopped for waiting materials in midway is avoided; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, the paving speed is controlled to be 2-3m/min, a spiral feeder of a paver is automatically and uniformly rotated during construction, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, the paver slowly, continuously and uniformly travels, and the thickness and the cross slope of the paved layer are checked at any time during the paving process;
step h: initial pressing: paving a section of the pavement, and then timely rolling the pavement once by using a double-steel-wheel road roller, wherein a driving wheel moves forwards during rolling, static pressure is applied during advancing, vibration is applied during retreating, the compaction speed is controlled to be 1.5-3km/h, the overlapping width of adjacent rolling belts is 20-30cm, and a watering device is used for discontinuously watering; repressing: adopting a single steel wheel road roller to perform vibration pressing, wherein the rolling times are 2 times of strong vibration, vibration is performed when the road roller moves forwards, and static pressure is performed when the road roller moves backwards; the overlapping width of the adjacent rolling belts is 1/2-1/3 wheels, and the compacting speed is controlled to be 1.5-3 km/h; rolling by a rubber-tyred roller after vibration, wherein the rolling times are 10 times, the rolling speed is 2-4km/h, and the overlapping width of adjacent rolling belts is 1/2-1/3 wheels; final pressure: and (3) performing static pressing on the polished surface for two times at the speed of 2-4km/h by adopting a double-steel-wheel road roller, then sending a specially-assigned person to measure the flatness by using a three-meter ruler, and if the flatness does not meet the requirement, continuing to perform static pressing until the flatness meets the requirement.
Step i: after the emulsified asphalt plant-mixed cold regeneration base layer mixture is paved, when the double-steel wheel and the single-steel wheel are rolled, the cold regeneration base layer mixture in the range of 10cm of the contact surface between the old road surface layer and the cold regeneration is not compacted, after the single-steel wheel road roller is rolled for 2 times, interface treatment liquid is poured into the top of the 10cm non-compacted area, the pouring amount of the liquid is proper for pouring the liquid into the bottom of the cold regeneration layer, after the pouring of the interface treatment liquid is completed, the single-steel wheel road roller is adopted to roll along the joint, the rolling is required to be statically moved before and after, and the rolling process of the tire road roller is not changed; and (3) sealing traffic in time after rolling is finished, carrying out natural curing, wherein the curing time is not less than 3d, and meanwhile, in order to avoid the damage of the wheels to the surface layer, uniformly spraying slow-breaking emulsified asphalt on the regenerated base layer, wherein the spraying dosage is preferably 0.2 kg/square meter to 0.4 kg/square meter.
More preferably, the step five of forming the lower layer of AC-25 by using an asphalt spreader to spread the mixture on the lower layer of AC-25 specifically includes the following steps:
step j: the method is characterized in that an asphalt paver is adopted for paving, an ironing plate is heated in advance before paving, the heating temperature is not lower than 100 ℃, the asphalt mixture conveyed to the site is uniform and consistent, no white aggregate, no segregation and agglomeration of coarse and fine aggregates are generated, the temperature is not lower than 150 ℃, sufficient feeding is ensured in the paving process, the next batch can be fed in time after the last batch is completely discharged, and the situation that the batch is stopped halfway and is waited is avoided; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, the paving speed is controlled to be 2-3m/min, a spiral feeder of a paver is automatically and uniformly rotated during construction, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, the paver slowly, continuously and uniformly travels, and the thickness and the cross slope of the paved layer are checked at any time during the paving process;
step k: initial pressing: the double-steel-wheel vibratory roller performs vibratory rolling for 3 times, a high-frequency low-amplitude mode is adopted, the wheel tracks of adjacent rolling belts are overlapped by about 15-20cm, the compacting speed is 4-5km/h, and the initial rolling finishing temperature is not lower than 110 ℃; repressing: rolling for at least 4 times by using a rubber-tyred roller, wherein the rolling needs to be performed in a full width mode, the length of a rolling section is about 30-50m, the number of re-pressing and compacting passes can ensure that a rubber-tyred tire does not have obvious wheel sticking, a re-pressing section cannot be overlapped with a section which is not subjected to primary pressing, the distance between the re-pressing section and the primary pressing section is about 10m, and the re-pressing finishing temperature is not lower than 80 ℃; final pressure: and after the repressing is finished, static pressing the surface of the light beam for two times at the speed of 2-4km/h by using a double-steel-wheel road roller, then sending a specially assigned person to measure the flatness by using a three-meter ruler, and if the flatness does not meet the requirement, continuing static pressing until the flatness meets the requirement.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
1. the new road structure layer and the old road structure layer are uniformly distributed with cement paste and fine aggregate on the contact side surface of the splicing structure, so that the new and old road splicing parts can be effectively bonded firmly to form a whole.
2. Milling and recovering the old road water-stable material, crushing, screening and doping new aggregate to form a new water-stable cold regeneration subbase layer mixture, so that the exploitation of non-renewable resources can be greatly reduced, and the problem that the waste building material occupies land resources for a long time is solved.
3. The production and the paving of the plant-mixed cold-recycling base layer mixture of the emulsified asphalt are operated under the normal temperature condition, no asphalt smoke is generated, the discharge of harmful substances is obviously reduced, the construction condition is improved, and the health of field construction personnel is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of a splicing structure of an asphalt pavement based on a recycled material according to the present invention;
FIG. 2 is a non-constructed pre-illustration of a water-cooled, stabilized regeneration underlayment according to the present invention;
FIG. 3 is a schematic representation of a water-stable cold regeneration sub-base construction process according to the present invention;
fig. 4 is a schematic representation of the construction of the glass fiber grating layer according to the present invention.
Reference numerals: 1-a geogrid layer; 2-water stable cooling regeneration subbase layer; 3-stabilizing the lower basal layer in water; 4-water stabilization of the upper basal layer; 5-a glass fiber grating layer; 6-emulsified asphalt plant-mixed cold regeneration base layer; 7-AC-25 lower layer; 8-new road structure layer; 9-old road structure layer; a 10-V groove; 11-water stop belt.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
A bituminous pavement splicing structure based on recycled materials is characterized in that the contact side surfaces of a new road structure layer 8 and an old road structure layer 9 and the splicing structure are of step-shaped structures, the splicing structure comprises a geogrid layer 1, a water-stable cold recycling underlayer 2, a water-stable lower base layer 3, a water-stable upper base layer 4, a glass fiber grid layer 5, an emulsified asphalt plant-mixed cold recycling base layer 6 and an AC-25 lower surface layer 7 which are sequentially laid from bottom to top, the contact surfaces of the water-stable cold recycling underlayer 2, the water-stable lower base layer 3 and the water-stable upper base layer 4 with the new road structure layer 8 and the old road structure layer 9 are respectively provided with a V-shaped groove 10, cement paste and fine aggregates for ensuring that the splicing structure is firmly bonded with the new road structure layer 8 and the old road structure layer 9 are filled in the V-shaped grooves 10, the water-stable cold recycling underlayer 2, the water-stable lower base layer 3, the water-stable upper base layer 4, the emulsified asphalt plant-mixed cold recycling base layer 6 and the AC, the height of the base layer is equal to that of the corresponding step, the thickness of the plant-mixed cold-recycling base layer 6 of the emulsified asphalt is 10-12 cm, and the thickness of the water-stabilized lower base layer 3 and the thickness of the water-stabilized upper base layer 4 are 18-20 cm; the particle size of the fine aggregate is 0-5 mm.
The concrete construction steps are as follows:
one, water steady cooling regeneration subbase layer construction
1) Firstly, excavating old road hard road shoulders and splicing wide side road surfaces to a roadbed top according to a construction design drawing and setting steps, after excavating to the roadbed top, determining whether the roadbed needs to be treated according to a deflection test result, and paving a layer of HDPE geogrid on the top surface of the roadbed after the roadbed is qualified, so that uneven settlement can be effectively reduced or avoided.
2) The loose paving coefficient of the water stable cooling regeneration subbase is 1.26, and the water stable cooling regeneration subbase mixture comprises the following components, 10-20 mm coarse aggregate: 15 parts by weight; milling and planing materials stably in water of 10-30 mm: 32 parts by weight; 5-10 mm water stable milling material: 24 parts by weight; 29 parts of 0-5mm fine aggregate; 3.2 parts by weight of cement; the water-stable milling material is prepared from recovered old pavement materials through crushing and screening. The construction time is 1-2% higher than the optimum water content, and the water loss in the transportation and paving process is prevented, so that the construction quality is not influenced, and the asphalt milling and planing material and the water-stable milling and planing material related by the invention are both recovered old pavement materials and are prepared by crushing and screening; the coarse aggregate and the fine aggregate are stones;
3) after the preparation of site construction is completed, cement paste (the water cement ratio is 1: 1) is uniformly sprayed on the vertical surfaces of the steps on the two sides of the new road and the old road, the spraying length is preferably 20-30 m in front of the paving operation surface, the distance between the spraying length and the paving machine is kept 10-15 m, and water stop belts are paved on the vertical surfaces of the steps on the two sides.
4) In order to avoid the segregation of the mixture caused by the large aggregates concentrated on the steps in the spreading process, fine aggregates are uniformly distributed on the steps on the two sides by manpower before spreading, and the distribution height is 1/2 step height and is in an isosceles triangle shape.
5) After the water-cooled regeneration subbase layer mixture is paved, compacting according to a conventional construction mode, reserving 30cm of steps on two sides during rolling without compacting, excavating a V-shaped groove with the depth of 8-10 cm at a joint of a new road and an old road, and then pouring cement paste (the water cement ratio is 1: 1), wherein the pouring amount is preferably that the cement paste does not seep downwards.
6) And after the cement paste is poured, filling the V-shaped groove with screened fine aggregate of 0-5mm, then carrying out static pressure once on the reserved 30cm by using a road roller, compacting by using the road roller in a mode of rolling for 10cm each time, and gradually extruding the water-cooling-stable regeneration mixture to the vertical surface of the step. In the rolling process, the road roller cannot be pressed on the step, and the place which cannot be pressed by the road roller is tamped by a manual skin hammer.
7) And (5) covering in time after the construction of the water-cooling-stable regeneration subbase layer is finished, and watering for health preservation.
Second, construction of underwater stable base layer
1) And (5) after the water-stable subbase layer is cured and is detected to be qualified, preparing the water-stable construction of the subbase layer. The water-stable lower base course loose paving coefficient is 1.30, the mixture mixing proportion is shown in the following table, the water content is 1% higher than the optimal water content during construction, and the water-stable lower base course mixture comprises the following components: 20-30 mm coarse aggregate, 23 parts by weight; 29 parts by weight of 10-20 mm coarse aggregate; 5-10 parts of coarse aggregate and 20 parts of a binder; 0-5mm coarse aggregate, 28 parts by weight; 4.3 parts of cement.
2) Before the construction of the water-stable lower base course, cleaning the lower bearing course, and spraying a layer of cement paste (the water cement ratio is 1: 2) with the spraying amount of 2.0-3.0 kg/square meter.
3) As shown in figures 2 and 3, cement paste (the water-cement ratio is 1: 1) is uniformly sprayed on the vertical surfaces of the steps on the two sides before paving, the spraying length is preferably 20-30 m before the paving operation surface, the distance between the spraying length and the paver is 10-15 m, and water stop belts are paved on the vertical surfaces of the steps on the two sides. Meanwhile, fine aggregates are uniformly distributed on the steps at two sides, the height of the fine aggregates is 1/2 of the steps, and the fine aggregates are in an inverted isosceles triangle shape.
4) After paving the base layer mixture under the water stability, compacting according to a conventional construction mode, reserving 30cm of steps on two sides during rolling without compacting, excavating a V-shaped groove with the depth of 8-10 cm at the joint of a new road and an old road, and then pouring cement paste (the water cement ratio is 1: 1), wherein the pouring amount is preferably that the cement paste does not seep.
5) After the cement paste is poured, the V-shaped groove is filled manually with fine aggregates, then the reserved 30cm is subjected to static pressure once by using a road roller, compaction is carried out by using the road roller in a mode of rolling for 10cm each time, and the water-stable mixture is gradually extruded to the vertical surface of the step. In the rolling process, the road roller cannot be pressed on the step, and the place which cannot be pressed by the road roller is tamped by a manual skin hammer.
Static pressure is adopted at the step part, vibration compaction is strictly forbidden, and damage to the lower step is prevented.
7) And covering in time after the construction of the base layer is finished under the water stability, and watering for health preservation.
Construction of water-stable upper base layer
The construction process of the water-stable upper base layer is the same as that of the lower base layer.
After the construction of the water-stable base course is completed, the emulsified asphalt permeable layer oil is sprayed in time, the spraying quantity is 1.55L per square meter, and the two side edges of the permeable layer oil are tightly covered by plastic films.
Fourthly, construction of plant-mixed cold-recycling base course of emulsified asphalt
1) The plant-mixed cold-recycling base layer mixture of the emulsified asphalt comprises the following components: 41 parts by weight of 10-20 mm asphalt milling material; 19 parts by weight of 5-10 mm asphalt milling material and 27 parts by weight of 0-5mm asphalt milling material; 10-20 parts of coarse aggregate by weight; 3 parts of mineral powder; 1.5 parts by weight of cement; 3.8 parts of emulsified asphalt; 3.3 parts by weight of water.
As shown in fig. 4, before the plant-mixed cold-recycling base course of the emulsified asphalt is paved, the lower bearing layer is protected and cleaned, and the layer surface is ensured to be free from impurity pollution such as loose particles, dust and the like; meanwhile, a layer of adhesive layer oil is sprayed according to requirements, and a layer of glass fiber grating with the width of 1m is synchronously paved on each of two sides of the step.
Before paving cold regeneration, cleaning and dedusting the contact surface of the old pavement layer and the cold regeneration, and uniformly coating the special emulsified asphalt for cold regeneration without exposing aggregate.
The asphalt paver is adopted for paving, the paver ensures sufficient feeding in the paving process, and ensures that the next vehicle can feed in time after the last vehicle is completely unloaded, so that the machine cannot be stopped for waiting materials midway; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, and the paving speed is controlled to be 2-4 m/min. During construction, the spiral feeder of the paver keeps automatic uniform rotation, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, and the paver slowly, continuously and uniformly walks. And (4) inspecting the thickness and the cross slope of the paving layer at any time in the paving process.
Roller compaction
① primarily pressing, namely paving a section of the roller, then timely following and rolling the roller once by using a double-steel-wheel roller, driving the roller forwards during rolling, performing static pressure during advancing, vibrating during retreating, controlling the compaction speed to be 1.5-3km/h, controlling the overlapping width of adjacent rolling belts to be 20-30cm, and intermittently sprinkling by a sprinkling device to ensure that the roller is not stuck, and realizing the principles of tight following, slow pressing, high frequency and low amplitude during rolling so as to achieve the purposes of stabilizing pressure and ensuring flatness.
② and performing repressing, namely performing vibration compaction by using a single steel wheel roller, wherein the rolling times are strong vibration for 2 times, changing the vibration to forward vibration for reducing cracks, and performing static pressure to backward vibration, the overlapping width of adjacent rolling belts is 1/2-1/3 wheels, the compacting speed is controlled to be 1.5-3km/h, performing rolling by using a rubber wheel roller after vibration, the rolling times are 10 times, the rolling speed is 2-4km/h, and the overlapping width of the adjacent rolling belts is 1/2-1/3 wheels.
③ final pressing, static pressing the surface of the roller with two steel wheels at a speed of 2-4km/h, and then sending a special person to measure the flatness with a three-meter ruler, and if the flatness does not meet the requirement, continuing static pressing until the flatness meets the requirement.
Step seam treatment for old and new roads
After the cold regeneration mixture is paved, when the double-steel wheel and the single-steel wheel are rolled, the cold regeneration mixture in the range of 10cm of the contact surface between the old pavement layer and the cold regeneration is not compacted. After the single steel wheel road roller rolls for 2 times, pouring interface treatment liquid into the top of an uncompacted area of 10cm, wherein the pouring amount of the liquid is preferably that the liquid is poured into the bottom of the cold regeneration layer.
After the interface treatment liquid is filled, a single steel wheel road roller is adopted to roll along the joint, the rolling requires static front and vibration back, and the rolling process of the tyre road roller is not changed.
7) And (5) sealing traffic in time after rolling is finished, and naturally preserving, wherein the preserving time is not less than 3 d. Meanwhile, in order to avoid the damage of the wheels to the surface layer, the regenerated layer can be uniformly sprayed with slow-breaking emulsified asphalt, and the spraying dosage is preferably 0.2kg per square meter to 0.4kg per square meter.
Fifthly, constructing the lower layer of the AC-25
1) The mixture of the lower layer of AC-25 comprises the following components: 18 parts of 20-30 mm coarse aggregate; 10-20 mm coarse aggregate, 30 parts by weight; 21 parts of 5-10 mm coarse aggregate; 4 parts of 3-5 mm fine aggregate; 0-3 parts of fine aggregate and 24 parts of cement; 3 parts of mineral powder. And stirring by adopting an intermittent asphalt stirrer, wherein the stirring time per disc is 45 s.
Thoroughly cleaning a lower bearing layer and step sundries before paving the lower layer, and uniformly brushing emulsified asphalt on the side surface of the step to ensure that the new and old structural layers are firmly bonded.
An asphalt paver is adopted for paving, the screed is heated in advance before paving, and the heating temperature is not lower than 100 ℃. The asphalt mixture delivered to the site is uniform and consistent, has no white material, no segregation and agglomeration of coarse and fine materials, and has a temperature of not lower than 150 ℃. The sufficient feeding is ensured in the spreading process, and the next vehicle can feed in time after the previous vehicle is completely unloaded, so that the machine cannot be stopped for waiting materials midway; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, and the paving speed is controlled to be 2-3 m/min. During construction, the spiral feeder of the paver keeps automatic uniform rotation, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, and the paver slowly, continuously and uniformly walks. And (4) inspecting the thickness and the cross slope of the paving layer at any time in the paving process.
Roller compaction
① preliminary pressing, namely, carrying out vibration rolling for 3 times by a double-steel-wheel vibratory roller, adopting a high-frequency low-amplitude mode, overlapping wheel tracks of adjacent rolling belts by about 15-20cm, compacting at a speed of 4-5km/h, and finishing the preliminary pressing at a temperature not lower than 110 ℃.
② re-pressing, i.e. rolling for at least 4 times by a rubber-tyred roller, wherein the length of a rolling section is about 30-50m, the number of re-pressing and compacting passes can ensure that the rubber-tyred tire has no obvious wheel sticking, the re-pressing section can not be overlapped with the section which is not subjected to primary pressing, the distance between the re-pressing section and the primary pressing section is about 10m, and the re-pressing finishing temperature is not lower than 80 ℃.
③ and performing final pressing, namely after the re-pressing is finished, performing static pressure on 2 light passing surfaces by using a double-steel-wheel road roller, and controlling the speed to be 3-4 km/h.
And after the paved layer is completely and naturally cooled and the surface temperature of the mixture is lower than 50 ℃, the traffic can be opened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a bituminous paving mosaic structure based on recycled material, new road structure layer (8) and old road structure layer (9) are step-like structure with mosaic structure contact side, its characterized in that: mosaic structure includes geotechnological grid layer (1), the steady cold regeneration undersole (2) of water laid in order from bottom to top, steady lower basic unit (3) of water, steady upper basic unit (4) of water, fine glass grid layer (5), emulsified asphalt plant mix cold regeneration basic unit (6) and AC-25 lower surface course (7), steady cold regeneration undersole (2) of water, steady lower basic unit (3) of water and steady upper basic unit (4) of water all are equipped with V type slot (10) with the contact surface of new road structure layer (8) and old road structure layer (9), V type slot (10) intussuseption is filled with and is used for guaranteeing mosaic structure and new road structure layer (8) and old road structure layer (9) firm cement paste and the fine aggregate that bonds.
2. The bituminous pavement splicing structure based on recycled materials of claim 1, wherein: the water-stable cold regeneration subbase layer (2), the water-stable lower base layer (3), the water-stable upper base layer (4), the emulsified asphalt plant-mixed cold regeneration base layer (6) and the AC-25 lower surface layer (7) respectively correspond to one step and are as high as the corresponding steps.
3. The bituminous pavement splicing structure based on recycled materials of claim 1, wherein: the thickness of the emulsified asphalt plant-mixed cold regeneration base layer (6) is 10-12 cm, and the thickness of the water-stabilized lower base layer (3) and the thickness of the water-stabilized upper base layer (4) are 18-20 cm; the particle size of the fine aggregate is 0-5 mm.
4. The construction method of the asphalt pavement splicing structure based on the recycled materials as claimed in any one of claims 1 to 3, characterized in that: comprises the following steps of (a) carrying out,
step one, constructing a water stable-cooling regeneration subbase layer (2), laying a layer of HDPE geogrid on the top surface of the subbase layer to form a geogrid layer (1) after the roadbed at the splicing structure is qualified, and then specifically comprising the following steps:
step a: cement paste is uniformly sprayed on the vertical surfaces of the steps on the two sides of the new road and the old road, water stop belts (11) are laid on the vertical surfaces of the steps on the two sides, fine aggregates are uniformly laid on the vertical surfaces on the outer sides of the water stop belts (11), the laying height is 1/2 step height, and the fine aggregates are in the shape of isosceles right triangles;
step b: paving a water stable-cooling regeneration subbase layer mixture to form a water stable-cooling regeneration subbase layer (2), compacting after the paving of the water stable-cooling regeneration subbase layer (2) is finished, wherein the compaction is not performed at a distance of 30cm from steps on two sides during rolling, a V-shaped groove (10) with the depth of 8-10 cm is excavated at a joint of a new road and an old road, then cement paste is poured, the pouring amount is proper to prevent the cement paste from seeping downwards, and after the pouring of the cement paste is finished, the V-shaped groove (10) is filled with fine aggregate;
step c: the reserved 30cm is firstly subjected to static pressure once by using a road roller, then the road roller is used for compacting in a mode of rolling for 10cm each time, the water-cooling-stable regeneration mixture is gradually extruded to the vertical surface of the step, the road roller cannot be pressed on the step in the rolling process, and a leather hammer is manually used for compacting the place which cannot be pressed by the road roller; after the construction of the water-cooling-stable regeneration subbase layer (2) is finished, covering in time, and watering for curing;
step two, constructing a water-stable lower base course (3), cleaning the lower base course before construction, and spraying a layer of cement paste with a water-cement ratio of 1:2, wherein the spraying amount is 2.0-3.0 kg/square meter, and the concrete steps are as follows:
step d: the same as step a;
step e: b, paving a water-stable lower base layer mixture to form a water-stable lower base layer (3), and after paving the water-stable lower base layer (3), finishing paving the water-stable cold regeneration subbase layer (2) in the step b;
step f: the same step as step c;
step three, constructing a water-stable upper base layer (4), and step two;
constructing an emulsified asphalt plant-mixed cold-regenerated base layer (6), spraying emulsified asphalt permeable oil in time after the water-stabilized upper base layer (4) is constructed, wherein the spraying amount is 1.55L/square meter, and the two side edges of the permeable oil are tightly covered by plastic films, wherein before the emulsified asphalt plant-mixed cold-regenerated base layer (6) is laid, a lower bearing layer is protected and cleaned, so that the layer surface is free from loose particles and dust impurity pollution, meanwhile, a layer of adhesive oil is sprayed according to requirements, and 1m wide glass fiber grids are synchronously laid on the two sides of each step to form glass fiber grid layers (5), the old road structure layer (9) and the cold-regenerated contact surface are cleaned to remove dust, and cold-regenerated special emulsified asphalt is uniformly coated, no aggregate is exposed, and a plant asphalt paver is adopted to carry out paving operation on the emulsified asphalt plant-mixed cold-regenerated base layer mixture to form the constructed emulsified asphalt plant-mixed cold-regenerated base layer (6);
step five: constructing a lower surface layer (7) of AC-25: mixing and stirring the mixture of the lower layer of the AC-25, stirring by adopting an intermittent asphalt mixer, wherein the stirring time of each disc is 45s, thoroughly cleaning the lower bearing layer and step sundries before the lower layer is paved, uniformly coating emulsified asphalt on the side surface of the step to ensure that the new and old structural layers are firmly bonded, then paving the mixture of the lower layer of the AC-25 by adopting an asphalt paver to form an AC-25 lower layer (7), completely and naturally cooling the paved layer, and opening the traffic after the surface temperature of the mixture is lower than 50 ℃.
5. The construction method according to claim 4, wherein: the loose paving coefficient of the water stable-cooling regeneration subbase layer (2) in the step I is 1.26, and the water stable-cooling regeneration subbase layer mixture comprises the following components, 10-20 mm coarse aggregates: 15 parts by weight; milling and planing materials stably in water of 10-30 mm: 32 parts by weight; 5-10 mm water stable milling material: 24 parts by weight; 29 parts of 0-5mm fine aggregate; 3.2 parts by weight of cement; the water-stable milling material is prepared from recovered old pavement materials through crushing and screening, and the water-cement ratio of the cement paste is 1: 1.
6. The construction method according to claim 4, wherein: in the second step, the loose coefficient of the water-stable lower base layer is 1.30, and the water-stable lower base layer material mixture comprises the following components: 20-30 mm coarse aggregate, 23 parts by weight; 29 parts by weight of 10-20 mm coarse aggregate; 5-10 parts of coarse aggregate and 20 parts of a binder; 0-5mm coarse aggregate, 28 parts by weight; 4.3 parts of cement.
7. The construction method according to claim 4, wherein: the emulsified asphalt plant-mixed cold-recycling base layer mixture in the fourth step comprises the following components: 41 parts by weight of 10-20 mm asphalt milling material; 19 parts by weight of 5-10 mm asphalt milling material and 27 parts by weight of 0-5mm asphalt milling material; 10-20 parts of coarse aggregate by weight; 3 parts of mineral powder; 1.5 parts by weight of cement; 3.8 parts of emulsified asphalt; 3.3 parts by weight of water.
8. The construction method according to claim 4, wherein: in the step five, the mixture of the lower layer of AC-25 comprises the following components: 18 parts of 20-30 mm coarse aggregate; 10-20 mm coarse aggregate, 30 parts by weight; 21 parts of 5-10 mm coarse aggregate; 4 parts of 3-5 mm fine aggregate; 0-3 parts of fine aggregate and 24 parts of cement; 3 parts of mineral powder.
9. The construction method according to claim 4, wherein: in the fourth step, an asphalt paver is adopted to pave the emulsified asphalt plant-mixed cold-recycling base layer mixture to form a construction emulsified asphalt plant-mixed cold-recycling base layer (6), and the method specifically comprises the following steps:
step g: the asphalt paver is adopted for paving, sufficient feeding is ensured in the paving process, the next vehicle can feed in time after the previous vehicle is completely unloaded, and the condition that the vehicle is stopped for waiting materials in midway is avoided; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, the paving speed is controlled to be 2-3m/min, a spiral feeder of a paver is automatically and uniformly rotated during construction, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, the paver slowly, continuously and uniformly travels, and the thickness and the cross slope of the paved layer are checked at any time during the paving process;
step h: initial pressing: paving a section of the pavement, and then timely rolling the pavement once by using a double-steel-wheel road roller, wherein a driving wheel moves forwards during rolling, static pressure is applied during advancing, vibration is applied during retreating, the compaction speed is controlled to be 1.5-3km/h, the overlapping width of adjacent rolling belts is 20-30cm, and a watering device is used for discontinuously watering; repressing: adopting a single steel wheel road roller to perform vibration pressing, wherein the rolling times are 2 times of strong vibration, vibration is performed when the road roller moves forwards, and static pressure is performed when the road roller moves backwards; the overlapping width of the adjacent rolling belts is 1/2-1/3 wheels, and the compacting speed is controlled to be 1.5-3 km/h; rolling by a rubber-tyred roller after vibration, wherein the rolling times are 10 times, the rolling speed is 2-4km/h, and the overlapping width of adjacent rolling belts is 1/2-1/3 wheels; final pressure: a double-steel-wheel road roller is adopted to carry out static pressing on the surface of the road for two times at the speed of 2-4km/h, then a specially assigned person is dispatched to measure the flatness by using a three-meter ruler, and if the flatness does not meet the requirement, the static pressing is continued until the flatness meets the requirement;
step i: after the emulsified asphalt plant-mixed cold regeneration base layer mixture is paved, when the double-steel wheel and the single-steel wheel are rolled, the cold regeneration base layer mixture in the range of 10cm of the contact surface between the old road surface layer and the cold regeneration is not compacted, after the single-steel wheel road roller is rolled for 2 times, interface treatment liquid is poured into the top of the 10cm non-compacted area, the pouring amount of the liquid is proper for pouring the liquid into the bottom of the cold regeneration layer, after the pouring of the interface treatment liquid is completed, the single-steel wheel road roller is adopted to roll along the joint, the rolling is required to be statically moved before and after, and the rolling process of the tire road roller is not changed; and (3) sealing traffic in time after rolling is finished, carrying out natural curing, wherein the curing time is not less than 3d, and meanwhile, in order to avoid the damage of the wheels to the surface layer, uniformly spraying slow-breaking emulsified asphalt on the regenerated base layer, wherein the spraying dosage is preferably 0.2 kg/square meter to 0.4 kg/square meter.
10. The construction method according to claim 4, wherein the step five of forming the AC-25 lower surface layer (7) by using an asphalt paver to pave the mixture of the AC-25 lower surface layer specifically comprises the following steps:
step j: the method is characterized in that an asphalt paver is adopted for paving, an ironing plate is heated in advance before paving, the heating temperature is not lower than 100 ℃, the asphalt mixture conveyed to the site is uniform and consistent, no white aggregate, no segregation and agglomeration of coarse and fine aggregates are generated, the temperature is not lower than 150 ℃, sufficient feeding is ensured in the paving process, the next batch can be fed in time after the last batch is completely discharged, and the situation that the batch is stopped halfway and is waited is avoided; the paving speed of the mixture is coordinated with the feeding speed of a mixing station, the mixture is continuously paved at a constant speed, the machine is stopped in the middle, the paving speed is controlled to be 2-3m/min, a spiral feeder of a paver is automatically and uniformly rotated during construction, the height of the mixture is not less than 2/3 of the feeder, the separation of the mixture is reduced, the paver slowly, continuously and uniformly travels, and the thickness and the cross slope of the paved layer are checked at any time during the paving process;
step k: initial pressing: the double-steel-wheel vibratory roller performs vibratory rolling for 3 times, a high-frequency low-amplitude mode is adopted, the wheel tracks of adjacent rolling belts are overlapped by about 15-20cm, the compacting speed is 4-5km/h, and the initial rolling finishing temperature is not lower than 110 ℃; repressing: rolling for at least 4 times by using a rubber-tyred roller, wherein the rolling needs to be performed in a full width mode, the length of a rolling section is about 30-50m, the number of re-pressing and compacting passes can ensure that a rubber-tyred tire does not have obvious wheel sticking, a re-pressing section cannot be overlapped with a section which is not subjected to primary pressing, the distance between the re-pressing section and the primary pressing section is about 10m, and the re-pressing finishing temperature is not lower than 80 ℃; final pressure: and after the repressing is finished, static pressing the surface of the light beam for two times at the speed of 2-4km/h by using a double-steel-wheel road roller, then sending a specially assigned person to measure the flatness by using a three-meter ruler, and if the flatness does not meet the requirement, continuing static pressing until the flatness meets the requirement.
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| CN112301826A (en) * | 2020-10-19 | 2021-02-02 | 中国建筑土木建设有限公司 | Emulsified asphalt cold-recycling pavement structure and rapid curing method for pavement |
| CN113584984A (en) * | 2021-07-29 | 2021-11-02 | 中交路桥建设有限公司 | Construction method for joint of hot-mix asphalt mixture and emulsified asphalt cold-recycling surface course |
| CN114032727A (en) * | 2021-11-30 | 2022-02-11 | 西安长大公路养护技术有限公司 | Construction method of large-particle-size cement regeneration base pavement structure |
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| 王炳玲;: "沪宁高速公路路面扩宽铣刨拼接施工技术", 路基工程, no. 06, 20 December 2007 (2007-12-20), pages 273 - 278 * |
| 王炳玲;: "沪宁高速公路路面扩宽铣刨拼接施工技术", 路基工程, no. 06, pages 273 - 278 * |
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| CN112301826A (en) * | 2020-10-19 | 2021-02-02 | 中国建筑土木建设有限公司 | Emulsified asphalt cold-recycling pavement structure and rapid curing method for pavement |
| CN113584984A (en) * | 2021-07-29 | 2021-11-02 | 中交路桥建设有限公司 | Construction method for joint of hot-mix asphalt mixture and emulsified asphalt cold-recycling surface course |
| CN114032727A (en) * | 2021-11-30 | 2022-02-11 | 西安长大公路养护技术有限公司 | Construction method of large-particle-size cement regeneration base pavement structure |
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