CN115341428A - Construction method of SMA asphalt mixture - Google Patents
Construction method of SMA asphalt mixture Download PDFInfo
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- CN115341428A CN115341428A CN202211163660.2A CN202211163660A CN115341428A CN 115341428 A CN115341428 A CN 115341428A CN 202211163660 A CN202211163660 A CN 202211163660A CN 115341428 A CN115341428 A CN 115341428A
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- sma asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 108
- 239000000203 mixture Substances 0.000 title claims abstract description 82
- 238000010276 construction Methods 0.000 title claims abstract description 51
- 238000005096 rolling process Methods 0.000 claims abstract description 71
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 239000004575 stone Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 238000007580 dry-mixing Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000011384 asphalt concrete Substances 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
- E01C7/262—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with fibrous material, e.g. asbestos; with animal or vegetal admixtures, e.g. leather, cork
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/46—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing and placing the materials, e.g. slurry seals
- E01C19/463—Bituminous mixtures of which at least part of the solid ingredients has previously been deposited on the surface, e.g. with lifting of spread or windrowed aggregate
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/46—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing and placing the materials, e.g. slurry seals
- E01C19/466—Solid materials, e.g. crushing same
-
- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
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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
- E01C7/36—Coherent pavings made in situ by subjecting soil to stabilisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of road and bridge engineering asphalt pavement construction, and discloses a construction method of an SMA asphalt mixture. The stone is dry-mixed, then the modified asphalt and the fiber are added for wet mixing, the material is discharged after the wet mixing is finished, and the mixed SMA asphalt mixture is stored and then is transported to a construction site; then, paving the SMA asphalt mixture by using a paver; then, a road roller is used to closely follow the paver to roll the paved SMA asphalt mixture; and opening light traffic with the weight not more than 2t 3 days after the rolling is finished, and opening all traffic 5 days after the rolling is finished. The construction method comprises mixing, transporting, paving and rolling, the construction temperature is limited in the process, and the problem that the SMA asphalt mixture influences the pavement performance due to temperature fluctuation in the construction process is solved. The invention improves the performance of the asphalt concrete pavement and prolongs the service life of the pavement by optimizing the mixing proportion of the SMA asphalt mixture.
Description
Technical Field
The invention relates to the technical field of road and bridge engineering asphalt pavement construction, in particular to a construction method of an SMA asphalt mixture.
Background
With the rapid development of economy, road traffic construction also develops rapidly, and the traffic flow and the use frequency of roads are also increased rapidly, so that various problems occur in the traditional asphalt pavement, and the traditional asphalt pavement cannot meet the use requirements more and more. On the basis, the modified asphalt with better performance is produced, the SMA asphalt mixture is an asphalt mastic macadam binder consisting of asphalt, a fiber stabilizer, mineral powder and a small amount of fine aggregates, can be used for filling gaps of a coarse aggregate framework in discontinuous grading, has small porosity, high water stability, good durability, strong high-temperature anti-rutting performance and good anti-sliding performance, can effectively improve the high-temperature stability and low-temperature toughness of asphalt concrete, prevents the mixture from dispersing, and thus improves the pavement quality.
At present, SMA asphalt mixture is generally used in the construction of road surface courses such as expressways, bridge decks and the like, however, in the actual construction process, the construction requirement of the SMA asphalt mixture is high, the mixing temperature of the SMA asphalt mixture needs to be strictly controlled, the problems of transportation, paving and rolling after mixing need to be considered, and if the raw material proportion and the mixing temperature fluctuate greatly, adverse effects can be caused to the subsequent paving and rolling processes, and the performance of the constructed road surface can be caused.
Therefore, how to provide a construction method of the SMA asphalt mixture has important significance for the development of asphalt pavement construction.
Disclosure of Invention
The invention aims to provide a construction method of an SMA asphalt mixture, which solves the problems in the existing construction method of the SMA asphalt mixture.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a construction method of an SMA asphalt mixture, which comprises the following steps:
(1) Mixing: dry-mixing stone, adding modified asphalt and fiber for wet-mixing, and discharging after wet-mixing to obtain an SMA asphalt mixture;
(2) Paving: paving the SMA asphalt mixture;
(3) Rolling: rolling the spread SMA asphalt mixture; the rolling comprises primary rolling, secondary rolling and track-collecting rolling;
(4) Opening traffic: opening light traffic with the weight not more than 2t 3 days after rolling, and opening all traffic 5 days after rolling;
wherein, the stone material in the step (1) comprises 8 to 15 percent of mineral powder, 60 to 80 percent of coarse aggregate and 10 to 25 percent of fine aggregate according to the mass fraction; the mass ratio of the modified asphalt to the stone is 6-7: 100, respectively; the mass of the fiber accounts for 0.2-0.4% of the mass of the SMA asphalt mixture.
Preferably, in the construction method of the SMA asphalt mixture, the fine aggregate in the step (1) is machine-made sand, and the particle size of the fine aggregate is 0.1-3 mm; the coarse aggregate comprises 20 to 34 percent of 0.075 to 4.75mm basalt broken stone and 66 to 80 percent of 4.75 to 13.2mm basalt broken stone.
Preferably, in the construction method of the SMA asphalt mixture, the dry mixing temperature in the step (1) is 200-240 ℃, and the dry mixing time is 10-20 s; the temperature of wet mixing is 180-190 ℃, and the time of wet mixing is 30-60 s; the temperature of the discharged material is 170-185 ℃.
Preferably, in the construction method of the SMA asphalt mixture, after the SMA asphalt mixture is obtained in the step (1), the SMA asphalt mixture is stored and then transported to a construction site;
wherein the storage time is not more than 6h; covering canvas for heat preservation in the transportation process; the transport speed does not exceed 10km/h.
Preferably, in the above construction method of the SMA asphalt mixture, before paving, the step (2) further includes spraying emulsified asphalt on the surface layer to be paved; the spraying amount of the emulsified asphalt is 0.3-0.5 kg/m 2 。
Preferably, in the construction method of the SMA asphalt mixture, in the step (2), the pavers are used for paving in an echelon combination mode, the number of the pavers in the echelon combination mode is 2-4, and the distance between the front paver and the rear paver is 10-20 m; the temperature of a screed plate of the paver is 100-120 ℃; the paver controls the paving thickness through a hanging wire or a drag rod; the running speed of the paver is 1.5-2 m/min.
Preferably, in the above construction method of the SMA asphalt mixture, the temperature for paving in step (2) is not lower than 160 ℃.
Preferably, in the above construction method of the SMA asphalt mixture, the running speed of the road roller in the primary rolling process in the step (3) does not exceed 3km/h; in the primary rolling process, the road roller advances to the tail position of the paver every time, backs up on the original wheel track after advancing every time, and advances for the second time to overlap the width of 2/3 wheels of the first time; the primary grinding is carried out once for one time when the front wheel moves forwards and backwards, and the primary grinding is carried out for 1 to 2 times; the temperature of the spread SMA asphalt mixture at the end of primary grinding is not lower than 150 ℃.
Preferably, in the above construction method of the SMA asphalt mixture, in the step (3), the horizontal oscillation roller is adopted for re-rolling for 3 to 4 times; and the temperature of the spread SMA asphalt mixture is not lower than 130 ℃ after the double grinding is finished.
Preferably, in the construction method of the SMA asphalt mixture, the mark collecting rolling in the step (3) adopts a steel wheel road roller to perform vibration-free mark collecting rolling for 1-2 times; the temperature of the paved SMA asphalt mixture is not lower than 120 ℃ after finishing the trace collecting and rolling.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the construction method comprises mixing, transporting, paving and rolling, the construction temperature and relevant construction process parameters are limited in the process, and the problem that the road surface performance is influenced by too large fluctuation difference of the temperature and the like in the construction process of the SMA asphalt mixture is solved. The invention improves the performance parameters of SMA by optimizing the mixing proportion of the SMA asphalt mixture, improves the performance of the asphalt concrete pavement and prolongs the service life of the pavement.
Detailed Description
The invention provides a construction method of an SMA asphalt mixture, which comprises the following steps:
(1) Mixing: performing dry mixing on stone, adding modified asphalt and fibers for wet mixing, and discharging after the wet mixing is finished to obtain an SMA asphalt mixture;
(2) Paving: paving the SMA asphalt mixture;
(3) Rolling: rolling the paved SMA asphalt mixture by using a road roller and a paver; the rolling comprises primary rolling, secondary rolling and track-collecting rolling;
(4) Opening traffic: and opening light traffic with the weight not more than 2t 3 days after the rolling is finished, and opening all traffic 5 days after the rolling is finished.
In the invention, the step (1) also comprises the step of detecting and determining the mixing proportion of the SMA asphalt mixture before mixing.
In the invention, the raw material composition of the SMA asphalt mixture in the step (1) comprises modified asphalt, stone and fiber; the stone material comprises 8 to 15 percent of mineral powder, 60 to 80 percent of coarse aggregate and 10 to 25 percent of fine aggregate according to mass fraction, further comprises 11 to 14 percent of mineral powder, 63 to 76 percent of coarse aggregate and 12 to 23 percent of fine aggregate, and more preferably comprises 13 percent of mineral powder, 72 percent of coarse aggregate and 15 percent of fine aggregate; the mass ratio of the modified asphalt to the stone is preferably 6-7: 100, more preferably 6.1 to 6.8:100, more preferably 6.4:100, respectively; the mass of the fibers is preferably 0.2 to 0.4%, more preferably 0.23 to 0.37%, and still more preferably 0.29% of the mass of the SMA asphalt mixture.
In the present invention, the modified asphalt in the step (1) is preferably an elastomeric polymer modified asphalt.
In the present invention, the fine aggregate in step (1) is preferably machine-made sand; the particle size of the fine aggregate is preferably 0.1 to 3mm; the coarse aggregate is preferably 20 to 34 percent of 0.075 to 4.75mm basalt broken stone and 66 to 80 percent of 4.75 to 13.2mm basalt broken stone, more preferably 22 to 31 percent of 0.075 to 4.75mm basalt broken stone and 69 to 78 percent of 4.75 to 13.2mm basalt broken stone, and even more preferably 27 percent of 0.075 to 4.75mm basalt broken stone and 73 percent of 4.75 to 13.2mm basalt broken stone.
In the present invention, the temperature of the dry-mixing in the step (1) is preferably 200 to 240 ℃, more preferably 207 to 232 ℃, and still more preferably 224 ℃; the time for dry stirring is preferably 10 to 20s, more preferably 12 to 19s, and still more preferably 16s; the temperature of the wet mixing is preferably 180 to 190 ℃, more preferably 181 to 187 ℃, and still more preferably 184 ℃; the time for wet-mixing is preferably 30 to 60 seconds, more preferably 38 to 56 seconds, and still more preferably 43 seconds; the temperature of the discharged material is preferably 170 to 185 ℃, more preferably 172 to 181 ℃, and still more preferably 177 ℃.
In the invention, the SMA asphalt mixture obtained in the step (1) is stored and then transported to a construction site; the storage time is not more than 6h; covering canvas for heat preservation in the transportation process; the transport speed does not exceed 10km/h; the self-discharging transport vehicle with the self weight not less than 10t is used for transportation; the self-discharging transport vehicle also comprises a chassis and wheels which are cleaned before the transport.
In the invention, before paving, the step (2) also comprises spraying emulsified asphalt on the surface layer to be paved; the spraying amount of the emulsified asphalt is preferably 0.3-0.5 kg/m 2 More preferably 0.32 to 0.47kg/m 2 More preferably 0.41kg/m 2 。
In the invention, in the step (2), the pavers are used for paving in an echelon combination mode, the number of the pavers in the echelon combination mode is preferably 2-4, more preferably 3, and the distance between the front paver and the rear paver is 10-20 m, more preferably 12-18 m, more preferably 16m; the temperature of the screed plate of the paver is preferably 100-120 ℃, more preferably 107-116 ℃, and more preferably 112 ℃; the paver controls the paving thickness through a hanging wire or a drag rod; the traveling speed of the paver is preferably 1.5 to 2m/min, more preferably 1.6 to 1.9m/min, and still more preferably 1.8m/min.
In the present invention, the temperature for the spreading in the step (2) is preferably not lower than 160 ℃.
In the invention, a road roller is used for rolling next to the paver in the step (3).
In the present invention, the working lengths of the primary rolling and the secondary rolling in step (3) are preferably 30 to 50m, more preferably 33 to 45m, and still more preferably 36m, independently.
In the present invention, the weight of the road roller in the step (3) is preferably not less than 10t.
In the invention, the running speed of the road roller in the primary rolling process in the step (3) is preferably not more than 3km/h; in the primary rolling process, the road roller advances to the tail position of the paver every time, backs up on the original wheel track after advancing every time, and advances for the second time to overlap the width of 2/3 wheels of the first time; the primary grinding is carried out once when the front part and the back part move forwards and backwards, and the primary grinding is carried out for 1-2 times; the temperature of the SMA asphalt mixture paved at the end of primary grinding is preferably not lower than 150 ℃.
In the invention, in the step (3), a horizontal oscillation road roller is adopted for secondary grinding for 3-4 times; the temperature of the spread SMA asphalt mixture at the end of the double grinding is preferably not lower than 130 ℃.
In the invention, the trace collecting and rolling in the step (3) adopts a steel wheel road roller to collect and roll for 1 to 2 times without vibration; the temperature of the paved SMA asphalt mixture at the end of the trace-collecting rolling is preferably not lower than 120 ℃.
In the invention, the step (3) also comprises rolling the edges, corners and the periphery of the rainwater well of the road surface, and the concrete method comprises the following steps:
rolling for 3-5 times by using a 2t road roller at a position which can be reached by the 2t road roller; using a hand-propelled road roller at a position where the 2t road roller cannot reach; tamping by using a small-sized motorized rammer at a position which cannot be reached by the hand-propelled road roller; when a 2t road roller, a hand-push road roller or a small-sized motor-driven rammer is adopted, the compactness and the flatness of rolling are ensured to meet the design and specification requirements.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A construction method of an SMA-13 asphalt mixture comprises the following steps:
(1) Detecting and determining the mixing ratio of the SMA-13 asphalt mixture:
the SMA-13 asphalt mixture comprises high-elasticity polymer modified asphalt, stone (stone is composed of 13% of mineral powder, 73% of basalt macadam and 14% of machine-made sand) and fiber, wherein the oil-stone ratio (the mass ratio of the high-elasticity polymer modified asphalt to the stone) is 6.4%, the mass of the fiber preferably accounts for 0.27% of the mass of the SMA-13 asphalt mixture, and the basalt macadam is composed of 24% of 0.075-4.75 mm basalt macadam and 76% of 4.75-13.2 mm basalt macadam;
the technical requirements and the test results of the high-elastic polymer modified asphalt are shown in Table 1:
TABLE 1 technical requirements and test results for high elastomeric Polymer modified asphalt
The technical requirements and the detection results of the mineral powder are shown in table 2:
TABLE 2 technical requirements and test results for mineral powder
The technical requirements and test results of the machine-made sand are shown in table 3:
TABLE 3 technical requirements and test results for machine-made sands
The technical requirements and detection results of the basalt broken stone are shown in table 4:
TABLE 4 technical requirements and test results for machine-made sands
Adding mineral powder, basalt broken stone and machine-made sand into a mixing plant, performing dry mixing for 15s at 210 ℃, adding high-elastic polymer modified asphalt and fiber, performing wet mixing for 45s at 184 ℃, discharging when the temperature is 175 ℃ after mixing, and obtaining an SMA-13 asphalt mixture;
(2) Storing the mixed SMA-13 asphalt mixture (the storage time is not more than 6 h), then transporting the mixture to a construction site by adopting a self-unloading transport vehicle with the self weight of 10t, covering canvas on the mixture during transportation for heat preservation, and the transportation speed is 10km/h; the chassis and wheels of the self-discharging transport vehicle are cleaned before the self-discharging transport vehicle is transported;
(3) Spraying emulsified asphalt on the construction road surface one day before paving, wherein the spraying amount is 0.4kg/m 2 ；
The paver is positioned at a paving starting point before construction, a screed plate of the paver is preheated to 120 ℃, two pavers are adopted to pave simultaneously, the distance between the front paver and the rear paver is 20m, the paving thickness is controlled through a wire, the walking speed of the paver is 1.5m/min, the paver cannot turn on a cast concrete layer when walking, and the paving temperature is 164 ℃;
(4) Rolling: rolling the paved SMA-13 asphalt mixture by using a road roller and a paver; the rolling comprises primary rolling, secondary rolling and track-collecting rolling, and the length of the primary rolling and the length of the secondary rolling are both 30m; the specific rolling method comprises the following steps:
primary grinding: static pressure is carried out by adopting a road roller with the self weight of 10t, the primary roller moves forward to the tail position of the paver every time and backs (repeats) on the original wheel track after moving forward every time, the second forward movement is overlapped with the first forward movement by 2/3 wheel width, the first forward and back movement is primary grinding, and the primary grinding is carried out for 2 times; the running speed of the primary rolling road roller is 3km/h, and the temperature of the spread SMA-13 asphalt mixture at the end of primary rolling is 152 ℃;
and (3) re-grinding: adopting a horizontal oscillation road roller to perform oscillation rolling for 4 times; the running speed of the composite roller is 5km/h, and the temperature of the spread SMA-13 asphalt mixture is 135 ℃ when the composite roller is finished;
mark collection and rolling: adopting a steel wheel road roller to perform vibration-free trace rolling for 2 times; the running speed of the trace collecting and rolling road roller is 5km/h, and the temperature of the spread SMA-13 asphalt mixture is 120 ℃ when the trace collecting and rolling are finished;
the method for rolling the edges and corners of the construction pavement and the periphery of the rainwater well comprises the following steps: rolling by using a road roller with the self weight of 2t, and tamping by using a dynamic rammer;
(5) Opening traffic: and (5) opening light traffic with the weight not more than 2t after 3 days of rolling compaction, and opening all traffic after 5 days of rolling compaction.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The construction method of the SMA asphalt mixture is characterized by comprising the following steps of:
(1) Mixing: performing dry mixing on stone, adding modified asphalt and fibers for wet mixing, and discharging after the wet mixing is finished to obtain an SMA asphalt mixture;
(2) Paving: paving the SMA asphalt mixture;
(3) Rolling: rolling the paved SMA asphalt mixture; the rolling comprises primary rolling, secondary rolling and track-collecting rolling;
(4) Traffic opening: opening light traffic with the weight not more than 2t 3 days after rolling, and opening all traffic 5 days after rolling;
wherein, the stone material in the step (1) comprises 8 to 15 percent of mineral powder, 60 to 80 percent of coarse aggregate and 10 to 25 percent of fine aggregate according to the mass fraction; the mass ratio of the modified asphalt to the stone is 6-7: 100; the mass of the fiber accounts for 0.2-0.4% of the mass of the SMA asphalt mixture.
2. The construction method of the SMA asphalt mixture according to claim 1, wherein the fine aggregate in the step (1) is machine-made sand, and the particle size of the fine aggregate is 0.1-3 mm; the coarse aggregate comprises 20 to 34 percent of 0.075 to 4.75mm basalt broken stone and 66 to 80 percent of 4.75 to 13.2mm basalt broken stone.
3. The construction method of the SMA asphalt mixture according to claim 1 or 2, characterized in that the dry mixing temperature in the step (1) is 200-240 ℃, and the dry mixing time is 10-20 s; the temperature of wet mixing is 180-190 ℃, and the time of wet mixing is 30-60 s; the temperature of the discharged material is 170-185 ℃.
4. The construction method of the SMA asphalt mixture according to claim 1, characterized in that after the SMA asphalt mixture is obtained in the step (1), the method further comprises storing the SMA asphalt mixture and then transporting the SMA asphalt mixture to a construction site;
wherein the storage time is not more than 6h; covering canvas for heat preservation in the transportation process; the transport speed does not exceed 10km/h.
5. The construction method of the SMA asphalt mixture according to claim 1 or 4, characterized in that the step (2) further comprises spraying emulsified asphalt on the surface layer to be paved before paving; the spraying amount of the emulsified asphalt is 0.3-0.5 kg/m 2 。
6. The construction method of the SMA asphalt mixture according to claim 5, characterized in that in the step (2), the pavers are paved by using pavers in an echelon combination mode, the number of the pavers in the echelon combination mode is 2-4, and the distance between the front pavers and the rear pavers is 10-20 m; the temperature of a screed plate of the paver is 100-120 ℃; the paver controls the paving thickness through a hanging wire or a drag rod; the walking speed of the paver is 1.5-2 m/min.
7. The construction method of the SMA asphalt mixture according to claim 1, 2 or 6, wherein the temperature for paving in the step (2) is not lower than 160 ℃.
8. The construction method of the SMA asphalt mixture according to claim 1 or 6, wherein the running speed of the road roller in the primary rolling process in the step (3) does not exceed 3km/h; in the primary rolling process, the road roller advances to the tail position of the paver every time, backs up on the original wheel track after advancing every time, and advances for the second time to overlap the width of 2/3 wheels of the first time; the primary grinding is carried out once when the front part and the back part move forwards and backwards, and the primary grinding is carried out for 1-2 times; the temperature of the spread SMA asphalt mixture at the end of primary grinding is not lower than 150 ℃.
9. The construction method of the SMA asphalt mixture according to claim 8, wherein in the step (3), the re-rolling is performed for 3-4 times by using a horizontal vibration roller; and the temperature of the spread SMA asphalt mixture is not lower than 130 ℃ after the double grinding is finished.
10. The construction method of the SMA asphalt mixture according to claim 1 or 9, characterized in that the mark-collecting rolling in the step (3) adopts a steel-wheel road roller to collect marks without vibration for 1-2 times; and the temperature of the paved SMA asphalt mixture is not lower than 120 ℃ after finishing the trace collecting and rolling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669152A (en) * | 2013-11-04 | 2014-03-26 | 沈阳市政集团有限公司 | Road surface construction method of ultrathin stone mastic asphalt mixture |
| CN104762862A (en) * | 2015-01-30 | 2015-07-08 | 中冶交通（沈阳）建设工程有限公司 | Stone mastic asphalt (SMA) pavement construction method |
| US20210114932A1 (en) * | 2019-10-18 | 2021-04-22 | Tongji University | Method for preparing hot-mixed asphalt mixture |
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|---|---|---|---|---|
| CN103669152A (en) * | 2013-11-04 | 2014-03-26 | 沈阳市政集团有限公司 | Road surface construction method of ultrathin stone mastic asphalt mixture |
| CN104762862A (en) * | 2015-01-30 | 2015-07-08 | 中冶交通（沈阳）建设工程有限公司 | Stone mastic asphalt (SMA) pavement construction method |
| US20210114932A1 (en) * | 2019-10-18 | 2021-04-22 | Tongji University | Method for preparing hot-mixed asphalt mixture |
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| 张劲雷;: "SMA改性沥青混合料在高速公路路面中的应用", 山西建筑, no. 33 * |
| 阎丽欣: "工程项目施工组织设计范例", 黄河水利出版社, pages: 424 * |
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