CN114775357A - Construction method for upper surface layer of steel slag asphalt mixture - Google Patents
Construction method for upper surface layer of steel slag asphalt mixture Download PDFInfo
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- CN114775357A CN114775357A CN202210476260.0A CN202210476260A CN114775357A CN 114775357 A CN114775357 A CN 114775357A CN 202210476260 A CN202210476260 A CN 202210476260A CN 114775357 A CN114775357 A CN 114775357A
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- 239000000203 mixture Substances 0.000 title claims abstract description 109
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
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- 238000005096 rolling process Methods 0.000 claims abstract description 71
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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
-
- 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
- E01C7/182—Aggregate or filler materials, except those according to E01C7/26
-
- 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
- E01C7/185—Isolating, separating or connecting intermediate layers, e.g. adhesive layers; Transmission of shearing force in horizontal intermediate planes, e.g. by protrusions
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a construction method of an upper surface layer of a steel slag asphalt mixture. The construction method comprises the following steps: preparing construction materials, checking and accepting a middle surface layer, constructing a bonding layer, mixing a steel asphalt mixture, transporting the steel slag asphalt mixture, paving the steel slag asphalt mixture, rolling the steel slag asphalt mixture, setting and processing construction joints, and checking and accepting; the rolling of the steel slag asphalt mixture comprises primary pressing, secondary pressing and final pressing, wherein the rolling speed of the primary pressing and the secondary pressing is 4-5km/h, and the rolling speed of the final pressing is 2-3 km/h. The construction method has the characteristics of simple construction process and high construction efficiency, and simultaneously, the cohesive force and the shear strength of the steel slag asphalt mixture adopted by the upper layer of the invention and the ageing resistance, the wear resistance and the like of the asphalt pavement are improved to a certain extent compared with the common crushed stone mixture, and the service level of the highway can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of pavement construction, and particularly relates to a construction method of an upper surface layer of a steel slag asphalt mixture.
Background
In recent years, asphalt concrete surface layers have the advantages of smooth surface, good wear resistance, no joints, convenience in construction period and maintenance and the like, and are widely applied to roads in China, but with increasing traffic volume, asphalt aging and pavement cracking seriously restrict the safe operation of the roads.
Asphalt, which is a viscoelastic material, has a relatively low molecular weight and a wide distribution range, is highly sensitive to temperature, becomes soft and tacky at high temperatures, becomes brittle and easily cracked at low temperatures, and has poor fatigue resistance, which limits the development of asphalt to some extent. Based on this, it is necessary to add some additive materials to the asphalt to form the asphalt mixture, so as to improve the problems of aging, pavement cracking and the like existing in the upper layer of the asphalt.
Disclosure of Invention
The invention aims to provide a construction method of an upper surface layer of a steel slag asphalt mixture, which aims to solve the problems of aging, pavement cracking and the like of the upper surface layer of asphalt.
In order to achieve the above purpose, the invention provides the following technical scheme:
a construction method of an upper surface layer of a steel slag asphalt mixture comprises the following steps: preparing construction materials, inspecting and accepting an intermediate surface layer, constructing a sticky layer, mixing a steel asphalt mixture, transporting the steel slag asphalt mixture, paving the steel slag asphalt mixture, rolling the steel slag asphalt mixture, setting and processing construction joints, and inspecting and accepting; the rolling of the steel slag asphalt mixture comprises primary pressing, secondary pressing and final pressing, wherein the rolling speed of the primary pressing and the secondary pressing is 4-5km/h, and the rolling speed of the final pressing is 2-3 km/h.
Optionally, the adhesive layer construction step specifically comprises:
cleaning the surface of the middle layer, drying the surface, and then spreading asphalt on the surface, wherein the asphalt is SBS modified emulsified asphalt with the spreading amount of 0.4-0.6kg/m2。
Optionally, in the step of mixing the steel asphalt mixture, wet mixing is performed first, and then dry mixing is performed, wherein the time of the wet mixing is 50-55s, and the time of the dry mixing is 10-15 s.
Optionally, in the step of paving the steel slag asphalt mixture, a single machine is adopted for whole paving construction, the paver adopts an automatic leveling mode, and a non-contact type balance beam mode is adopted to control the elevation and the thickness of an asphalt structure layer; the screed plate of the paver is preheated before the paver starts to operate, and the temperature of the preheated screed plate is between 100 ℃ and 150 ℃.
Optionally, in the step of paving the steel slag asphalt mixture, the paving speed is 1-3 m/min.
Optionally, in the paving step of the steel slag asphalt mixture, the loose paving coefficient is 1.2-1.3, and the loose paving thickness is 4.8-5.0 cm; when paving, the construction temperature of the asphalt pavement is more than 10 ℃.
Optionally, in the step of rolling the steel slag asphalt mixture, staggered rolling is adopted during rolling, and the two rolling tracks are controlled according to the overlapping distance of 25-35 cm.
Optionally, both the primary rolling and the secondary rolling are performed after the paver, the rolling passes are 4-5 times, the final rolling is performed by static pressure polishing until wheel tracks are eliminated, and the rolling passes are 1.
Optionally, in the step of setting and processing the construction joint, before the temperature is not completely reduced after the construction on the same day, manually removing and aligning the tail end of the paving material by using an air pick, so that the transverse joint direction is perpendicular to the paving direction, and the transverse joint between the upper layer and the lower layer is staggered by at least 1 m; the rolling operation at the transverse joint is as follows: firstly, a double-steel-wheel road roller is used for carrying out transverse rolling, the road roller is positioned on a compacted mixed material layer during rolling, the width of the road roller extending into a new paving layer is 12-18cm, then the road roller moves 15-20cm towards the newly paved mixed material after being pressed once until the road roller is completely paved on the new paving layer, and then the road roller is used for carrying out longitudinal rolling.
Optionally, the construction method further comprises road surface anti-pollution treatment, traffic control and traffic opening, wherein in the road surface anti-pollution treatment step, concrete is adopted for hardening an uphill road, color strip cloth is paved at the position of the uphill road, a waterwheel is arranged for washing vehicle tires, and vehicles entering and leaving the uphill road are wrapped at the bottom of the vehicle by oilcloth; the traffic control and open traffic steps are specifically that closed traffic is carried out on the finished asphalt structure layer, all overloaded vehicles are prohibited from passing through the constructed road surface, and the traffic can be opened after the temperature of the road surface is lower than 50 ℃.
Has the advantages that:
the construction method of the upper surface layer of the steel slag asphalt mixture has the characteristics of simple construction process and high construction efficiency, and meanwhile, the cohesive force and the shear strength of the steel slag asphalt mixture adopted by the upper surface layer of the invention as well as the ageing resistance, the wear resistance and the like of an asphalt pavement are improved to a certain extent compared with the common crushed stone mixture, so that the service level of a highway is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a process flow chart of a construction method of a steel slag asphalt mixture upper surface according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides a construction method of an upper layer of a steel slag asphalt mixture, aiming at solving the problems of aging, pavement cracking and the like of the upper layer of asphalt.
The application of the steel slag in highway engineering can reduce the demand of highway construction on stone, reduce the exploitation of natural stone and improve the ecological environment damage caused by large-scale mountain exploitation and stone exploitation, and has lower crushing value, rough surface characteristic and good adhesiveness with asphalt, and the cohesive force, shear strength, ageing resistance, wear resistance and the like of a steel slag asphalt mixture are improved to a certain extent compared with those of a common crushed stone mixture, so that the service level of a highway can be effectively improved.
The construction method comprises the following steps of carrying out test section construction before construction, wherein the test section construction is divided into two stages of trial mixing and trial paving of the steel slag asphalt mixture, the reasonable type, the quantity and the combination mode of the construction machinery are determined according to the principle that the construction capacities of various machines are matched, and the operation mode of a mixing machine, such as loading speed, mixing quantity, mixing time, mixing temperature and the like, is determined through trial mixing; meanwhile, the mix proportion design of the steel slag asphalt mixture and the material index of the asphalt mixture are verified, and the mix proportion of the steel slag mineral aggregate and the oilstone ratio for formal production are determined. Determining the operation mode, the paving temperature, the paving speed, the preliminary vibration and tamping method and intensity, the automatic leveling mode and the like of the paver through trial paving; determining the selection, combination, rolling sequence, rolling temperature, rolling speed and rolling times of a rolling machine; determining a proper loose coefficient; the mineral aggregate void fraction, asphalt saturation, bulk density, stability and flow values were determined by the marshall test. And determining whether the rated normal capacity of the mixing station is matched with the site construction progress. According to the construction of the test section, various technical parameters can be determined so as to guide large-area construction.
As shown in the schematic construction flow diagram of fig. 1, the construction method of the present invention includes the following steps: the construction method comprises the following steps of construction material preparation, medium surface layer acceptance inspection, adhesive layer construction, steel asphalt mixture mixing, steel slag asphalt mixture transportation, steel slag asphalt mixture paving, steel slag asphalt mixture rolling, construction joint setting and processing, inspection acceptance inspection, road surface anti-pollution processing, traffic control and open traffic, and each construction step is specifically introduced below.
The construction preparation is carried out before the construction, and the steel slag asphalt material and the middle surface layer are mainly prepared for acceptance, wherein the material preparation comprises the following steps: (1) the anti-skid wearing layer of the asphalt pavement adopts SBS modified emulsified asphalt, the material performance of the SBS modified emulsified asphalt is detected by a test before construction, and the performance index of the SBS modified emulsified asphalt needs to meet the requirement of table 1.
TABLE 1SBS modified emulsified asphalt quality requirement
It should be noted that, in the construction process, samples are periodically taken to check the product quality, and the SBS modified emulsified asphalt which is found to have the quality not meeting the requirements such as segregation and the like cannot be used.
(2) The steel slag coarse aggregate is clean, dry and free of impurities; the surface is as dense as possible, allowing a few cellular pores. The content of free calcium oxide of the steel slag coarse aggregate used in the steel slag asphalt mixture is not more than 3 percent; the water-soaking expansion rate of the steel slag coarse aggregate used in the steel slag asphalt mixture is not more than 1.8 percent. The steel slag coarse aggregate has the specification shown in Table 2.
TABLE 2 specification of coarse aggregate of steel slag
The content of particles below 0.075mm of the steel slag coarse aggregate is not more than 2 percent by a water washing method, and the quality technical indexes are shown in Table 3.
TABLE 3 quality technical index of coarse aggregate of steel slag
(3) And (3) fine aggregate, namely, machining sand with the thickness of 0-3mm, cleaning and drying, wherein the quality of the fine aggregate meets the technical requirements of tables 4 and 5 through detection.
TABLE 4 quality specifications for fine aggregates
| Item | Unit of | Technical index | Measured value |
| Apparent relative density of not less than | t/m3 | 2.50 | 2.678 |
| Firmness (> 0.3mm part) is not more than | ％ | 12 | 4 |
| Sand equivalent of not less than | ％ | 60 | 64 |
| Angularity (flow time) of not less than | s | 30 | 33.1 |
TABLE 5 Fine aggregate specification for steel slag asphalt mixture
(4) And the filler is mineral powder obtained by finely grinding limestone, and the mineral powder is dry and clean and meets the technical requirements of Table 6 in quality.
TABLE 6 quality technical requirements of the filler mineral powder
In order to improve the water damage resistance of the asphalt mixture, quicklime powder or cement accounting for 1.3 +/-0.3 percent of the total weight of the mixture is added into the mineral powder, and the reclaimed powder is not used for replacing the mineral powder as a filler.
(5) The fiber stabilizer used in the asphalt mixture is loose flocculent lignin fiber, the lignin fiber is made of coniferous wood, the addition amount of the lignocellulose is 0.3 percent of the mass of the asphalt mixture, and the quality technical requirements meet the technical requirements of table 7.
TABLE 7 technical requirements of Lignin batting fibers
| Test items | Technical requirements | Measured value |
| Fiber length of not more than | 6mm | 5.2 |
| Ash content (%) | 18 +/-5 volatile-free substances | 20.5 |
| pH value | 7.5±1.0 | 6.9 |
| Oil absorption of not less than | 5 times of fiber mass | 8.9 |
| Water content (%) | Less than or equal to 5 (calculated by mass) | 2.4 |
The steel slag asphalt mixture is subjected to Marshall design, mixture water stability design, mixture high and low temperature stability test and construction performance test, and specifically meets the technical standards of Table 8.
TABLE 8 technical Standard of Steel slag asphalt mixture
| Test indexes | Unit | Asphalt steel slag mixture |
| Nominal maximum particle size | mm | 13.2 |
| Number of hits (double faces) | Next time | 75 |
| Void fraction vv | ％ | 3.0-4.0 |
| Mineral aggregate void ratio VMA of not less than | ％ | 16 |
| Saturation VFA | ％ | 75-85 |
| Stability of not less than | kN | 6 |
| Flow value | 0.1mm | -- |
| Residual stability of not less than | ％ | 85 |
| Coarse aggregate void fraction VCA | ％ | ≯VCADRC |
| Freeze-thaw splitting strength ratio of not less than | ％ | 80 |
| Dynamic stability of not less than | Sub/mm | 4000 |
| Sierranberg leak of not more than | ％ | 0.1 |
| Kentuckab flies no more than | ％ | 15 |
The volume expansion rate of the steel slag asphalt mixture test piece is not more than 1.5 percent, and if the volume expansion rate is more than the volume expansion rate, the steel slag needs to be aged until the volume expansion rate meets the requirements and then can be used.
The target mixture ratio of the steel slag asphalt mixture is shown in table 9, and in addition, the optimal asphalt content is 5.5%, the content of the externally-doped fibers is 0.3%, the void ratio is 3.5%, the relative bulk density is 2.891, and the theoretical maximum relative density is 2.997.
TABLE 9 target mix proportion of upper layer of steel slag asphalt mixture
| Raw material | 10-15mm steel slag | Steel slag 5-10mm | Machine-made sand 0-3mm | Mineral powder |
| Percent (%) | 37 | 40 | 13 | 10 |
And further, sampling materials entering the hot material bins of the batch mixer after secondary screening, determining the material proportion of each hot material bin and the material proportion of mineral powder, and enabling the synthetic gradation of the mineral materials to be close to the target mixing proportion for a control room of the mixer. Meanwhile, the proper size and installation angle of the vibrating sieve pores are selected, so that the feeding of each hot material bin is approximately balanced. The optimum asphalt amount for the target mix ratio was subjected to Marshall test and trial mixing, and the production mix ratio was determined comprehensively by laboratory tests and sampling tests from a mixer, as shown in Table 10, and further, the optimum asphalt content was 5.34%, the content of foreign fibers was 0.3%, the void ratio was 3.5%, the bulk relative density was 2.892, and the theoretical maximum relative density was 2.998.
TABLE 10 production mix proportion of steel slag asphalt mixture
| Raw material | 11-18mm steel slag | 6-11mm steel slag | Machine-made sand 0-3mm | Mineral powder |
| Percent (%) | 37 | 41 | 12.5 | 9.5 |
In the embodiment of the invention, according to the design and specification requirements, various technical indexes such as the compactness of the middle surface layer, the longitudinal section height, the flatness, the cross slope, the water seepage coefficient and the like are checked item by item, holes left by core drilling detection are filled and compacted in layers by using the same material in advance, and the check result is qualified.
In the specific embodiment of the invention, the construction steps of the adhesive layer are as follows: cleaning and washing the surface of the middle surface layer, after the surface is dried, spraying asphalt on the surface by using an intelligent asphalt spraying vehicle, wherein the asphalt is SBS modified emulsified asphalt and the spraying amount is 0.4-0.6kg/m2(e.g., 0.4 kg/m)2、0.5kg/m2、0.6kg/m2And any interval value between any two endpoint values). It should be noted that, the check and acceptance are performed after the surface of the middle surface layer is dried, and the adhesive layer spreading can be performed after the check and acceptance is qualified.
The speed and the spraying amount should be kept stable during spraying, the asphalt spraying vehicle should uniformly spray in the whole width, and brushes are applied to the side surfaces of the kerbs and other parts which are not easy to spray, and the like for manual brushing.
When the temperature is lower than 10 ℃ or the road surface is wet, no adhesive layer asphalt is sprayed; the oil of the sticky layer is preferably sprayed on the same day, and the asphalt layer is paved next to finish demulsification and water evaporation of the emulsified asphalt, so that the sticky layer is ensured not to be polluted.
It should be noted that if the protection to the curb is not in place before the adhesive layer spills cloth, cause some curb to pollute, for this reason, at first reduce the asphalt distributor shower nozzle side baffle, prevent to spray to the side and pollute the curb, secondly strengthen the safeguard procedures, adopt plastic sheeting to cover the parcel to the curb before spilling cloth.
In the concrete embodiment of the invention, in the step of mixing the steel asphalt mixture, HQLBQ4000 type mixing equipment is selected, and the rated capacity is 320 t/h. When the steel slag asphalt mixture is produced, the actual production efficiency is not more than 50% of the maximum production efficiency determined by the mixing station. Cut down the stockpile on vertical height in advance before the material loading to reduce the loader when the bottom is shoveled the material coarse aggregate and slide off the segregation by a wide margin.
In the step of mixing the steel asphalt mixture, wet mixing is firstly carried out, and then dry mixing is carried out, wherein the wet mixing time is 50-55s (such as 50s, 51s, 52s, 53s, 54s, 55s and any interval value between any two end values), and the dry mixing time is 10-15s (such as 10s, 11s, 12s, 13s, 14s, 15s and any interval value between any two end values). Alternatively, the stir time per pot was set to 70s, with a wet mix time of 55s and a dry mix time of 15 s. The steel slag asphalt mixture should be uniformly mixed, all the used mineral aggregate particles should be coated with the asphalt mixture, and the steel slag asphalt mixture has no white material, and has no segregation and agglomeration of coarse and fine materials.
In the transportation of the steel slag asphalt mixture, the transport vehicle must be cleaned before use every time, and in order to prevent the asphalt mixture from being bonded with the carriage plate, the inner side of the carriage is uniformly coated with the vegetable oil type separant. The delivery temperature and the on-site temperature of the asphalt mixture are detected (1 vehicle and 1 test) by a digital display plug-in thermocouple thermometer, and the insertion depth is more than 150 mm. The middle part of the side surface of the material transporting vehicle is provided with a special detection hole, and the distance between the hole opening and the bottom surface of the carriage is about 300 mm.
When the mixer discharges materials to the transport vehicle, 50cm can be selected to reduce the segregation phenomenon of the mixed materials and shorten the discharging distance from the discharging port to the carriage as much as possible. Furthermore, the periphery of the material transporting vehicle adopts a totally enclosed heat preservation measure, and the top adopts a heat preservation, rainproof and pollution prevention measure for covering the tarpaulin and the cotton quilt.
The carrying capacity of the asphalt mixture transport vehicle is ensured to be more than the mixing capacity and the paving speed, at least 7 material transport vehicles wait for unloading in front of the paver, and the paver continuously, uniformly and uninterruptedly paves. And measuring the temperature of the mixture after each material conveying vehicle arrives at the site, and if the temperature is lower than the paving temperature, treating the mixture as waste, and treating the mixture which is caked or is subjected to rain as waste.
It should be noted that, in the continuous paving process, the material transporting vehicle stops 10-30cm (for example, 10cm, 20cm, 30cm and the interval value between any two end point values) in front of the paver and must not impact the paver. And in the unloading process, the material transporting vehicle is hung on a neutral gear and is pushed to advance by the paver so as to ensure the flatness of the pavement at the paving position.
Further, regularly adopt high-pressure squirt to wash the transport vechicle chassis to avoid the individual transport vechicle chassis clearance incomplete, have earth to drop and cause the pollution.
In the step of paving the steel slag and asphalt mixture, a medium-large DT2360 paver is selected for construction, the paving width is 18.75m, a single machine is adopted for whole paving construction, the paver adopts an automatic leveling mode, the elevation and the thickness of an asphalt structure layer are controlled by adopting a non-contact type balance beam mode, and the relative height difference is adjusted according to the thickness of the structure layer.
The screed plate of the paver is preheated before the paver starts to operate, and the temperature of the preheated screed plate is between 100 ℃ and 150 ℃. The paving of the steel slag asphalt mixture is carried out slowly, uniformly and continuously, random change or midway pause cannot be carried out in the paving process, wherein the paving speed is 1-3m/min (such as 1m/min, 2m/min, 3m/min and an interval value between any two end points).
In the paving step of the steel slag asphalt mixture, the loose paving coefficient is 1.2-1.3 (such as 1.2, 1.3 and any interval value between any two end values), and the loose paving thickness is 4.8-5.0cm (such as 4.8cm, 4.9cm, 5.0cm and any interval value between any two end values); preferably, the loose coefficient is 1.2 and the loose thickness is 4.8cm during construction. When paving, the construction temperature of the asphalt pavement is more than 10 ℃, the construction is carried out in the process of continuously raising the temperature, and the paving of the asphalt pavement cannot be carried out when the temperature is lower than 10 ℃.
The spreader is adjusted to the best working state, the spiral conveyor and the duplex material level device are adjusted well, and the opening degree of the material door, the speed of the chain plate feeder and the rotating speed of the spiral distributor are matched. The surface of the mixture in the screw conveyor is preferably higher than 2/3 of the screw conveyor (namely the mixture is kept above the conveying rotating shaft), so that the height of the mixture in front of the baffle plate of the ironing plate is kept consistent in the full-width range, and the segregation phenomenon of the spreading layer is avoided.
It should be noted that the personnel on the working face of the paving frequently walk, no technical pit filling points are arranged, and the walking of the operating personnel on the working face, shaping and filling of the personnel are reduced in the follow-up large-area construction.
During rolling of the steel slag asphalt mixture, the road roller performs water spraying running on the laid color strip cloth in advance before rolling, so that dust and scale on the steel wheel are eliminated. During rolling, the road roller rolls at a constant speed, and the rolling process is followed by slow pressing, low-first-then-high, high-frequency low-amplitude, constant speed and little water; during rolling, staggered rolling is adopted, the two rolling tracks are controlled according to the overlapping of 25-35cm (such as 25cm, 28cm, 30cm, 32cm, 35cm and any interval value between any two end point values), and preferably, the two rolling tracks are controlled according to the overlapping of 30cm during rolling.
The rolling of the steel slag asphalt mixture comprises initial pressing, secondary pressing and final pressing, wherein the rolling speed of the initial pressing and the secondary pressing is 4-5km/h (such as 4km/h, 5km/h and the interval value between any two end point values), and the rolling speed of the final pressing is 2-3km/h (such as 2km/h, 3km/h and the interval value between any two end point values). Optionally, 5 PK6200 type double-steel-wheel rollers (14 tons) and 1 small-sized vibratory roller (3.5t) are selected as rolling equipment, and two rolling combinations are adopted, wherein the specific rolling processes are shown in tables 11 and 12, and the rolling mode and the specific rolling times in the construction process can be determined according to the results of the test section.
TABLE 11 combination of rolling compaction mode I
TABLE 12 Rolling combination mode II
It should be noted that, during rolling, the rolling machine should roll following the paver, and the rolling machine should be shut down in a stepped manner during turning back. Rolling from outside to inside and from low to high. The vibratory roller needs to start and start vibration first and stop vibration first and then stop.
Further, the road edge is additionally rolled by a small-sized vibratory roller, and in order to ensure the edge compaction degree, the 14t double-steel-wheel roller is vibrated and compacted along the edge of the curb stone. The construction temperature of the steel slag asphalt mixture at each stage is shown in table 13.
TABLE 13 construction temperature of hot mix asphalt mixture
In the construction joint setting and processing step, because work is interrupted or work is finished on the same day, the tail end of the paving material is cooled, a transverse joint is made, in order to ensure that the joint is bonded, holes are prevented from being generated, the transverse joint is prevented from being cut by a cutting machine, before the temperature is not completely reduced after construction on the same day, the tail end of the paving material is manually planed and aligned by an air pick, so that the transverse joint direction is perpendicular to the paving direction, and inclined joints are strictly forbidden.
Furthermore, the transverse joint between the upper layer and the lower layer is staggered by at least 1m, a proper amount of adhesive asphalt is coated on the vertical edge of the tail end before next paving, and the height of the flat plate is adjusted to reserve a reserved amount for rolling.
Firstly, carrying out transverse rolling by using a double-steel-wheel roller, wherein the roller is positioned on the compacted mixed material layer during rolling, the width of the roller extending into a new paving layer is 12-18cm (such as 12cm, 14cm, 16cm, 18cm and any interval value between any two end point values), and preferably, the width of the roller extending into the new paving layer is 15cm during rolling. Then moving 15-20cm (such as 15cm, 16cm, 17cm, 18cm, 19cm, 20cm and any interval value between any two endpoint values) to the newly laid mixture once for each time until all the materials are on the newly laid layer, and then performing longitudinal rolling. When the transverse joint is rolled, the transverse joint moves forward and moves back by static pressure, so that the flatness deviation of the joint caused by the fact that the joint is concave due to forward vibration and opening vibration is avoided.
In the checking and acceptance step, the loose coefficient, the flatness and the compactness are mainly detected, wherein the loose coefficient is measured in a test section according to the frequency of one section of 20 meters, 4 points are measured on each section, the elevations before paving, after paving and after forming are measured, and then the loose coefficient is calculated. And in the test section, the loose coefficient of 1.22 is adopted for paving, the average loose thickness is measured to be 4.9cm, the average compacted thickness is 4.1cm, the loose coefficient is calculated to be 1.2, and the acceptance is qualified. In the construction process, the flatness of joints and the connection parts of the structures must be detected by using a 6m ruler at any time, and unqualified parts are found and repaired in time. And the flatness of the normal road section is measured by adopting a continuous flatness meter. The field compactness of the upper layer is controlled by adopting two indexes of void ratio and compactness, and the compactness is required to be more than 98 percent. Meanwhile, the method is supplemented as an on-site compaction control index according to the requirement that the on-site extreme value void ratio is 3.5-6.5% and the average value is 4-6%, the degree of compaction of the maximum theoretical density is not less than 94%, and the water permeability coefficient is not more than 80 ml/min. And detecting the compaction degree of the asphalt mixture by adopting a core drilling method.
In the road surface anti-pollution treatment step, the uphill road adopts concrete hardening, and color stripe cloth is laid at the road slope, arranges the waterwheel to wash the vehicle tire, and avoids the vehicle from bringing mud into the mud mass and directly entering the paving site. The vehicles passing in and out of the uphill slope are wrapped at the bottom of the vehicle by the oilcloth, so that the road surface is prevented from being polluted by oil leakage of the vehicles.
And the traffic control and open traffic steps are specifically that closed traffic is carried out on the finished asphalt structure layer, all overloaded vehicles are prohibited from passing through the constructed road surface, and the traffic can be opened after the temperature of the road surface is lower than 50 ℃.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The construction method of the upper surface layer of the steel slag asphalt mixture is characterized by comprising the following steps of: preparing construction materials, checking and accepting a middle surface layer, constructing a bonding layer, mixing a steel asphalt mixture, transporting the steel slag asphalt mixture, paving the steel slag asphalt mixture, rolling the steel slag asphalt mixture, setting and processing construction joints, and checking and accepting; wherein,
the rolling of the steel slag asphalt mixture comprises primary pressing, secondary pressing and final pressing, wherein the rolling speed of the primary pressing and the secondary pressing is 4-5km/h, and the rolling speed of the final pressing is 2-3 km/h.
2. The construction method of the upper surface layer of the steel slag asphalt mixture according to claim 1, characterized in that the construction steps of the adhesive layer are as follows: cleaning the surface of the middle layer, drying the surface, and spraying asphalt on the surface, wherein the asphalt is SBS modified emulsified asphalt and the spraying amount is 0.4-0.6kg/m2。
3. The construction method of the upper layer of the steel slag asphalt mixture as claimed in claim 1, wherein the step of mixing the steel asphalt mixture comprises wet mixing and dry mixing, wherein the time of the wet mixing is 50-55s, and the time of the dry mixing is 10-15 s.
4. The construction method of the upper surface layer of the steel slag asphalt mixture according to claim 1, wherein in the step of paving the steel slag asphalt mixture, a single machine is adopted for whole paving construction, the paver adopts an automatic leveling mode, and a non-contact type balance beam mode is adopted for controlling the elevation and the thickness of an asphalt structure layer;
the screed plate of the paver is preheated before the paver starts to work, and the temperature of the preheated screed plate is between 100 ℃ and 150 ℃.
5. The method of constructing the upper layer of a steel slag asphalt mixture according to claim 4, wherein the paving speed in the step of paving the steel slag asphalt mixture is 1-3 m/min.
6. The construction method of the upper layer of the steel slag asphalt mixture according to claim 4, wherein in the paving step of the steel slag asphalt mixture, the loose paving coefficient is 1.2-1.3, and the loose paving thickness is 4.8-5.0 cm;
when paving, the construction temperature of the asphalt pavement is more than 10 ℃.
7. The method for constructing the upper surface of the steel slag asphalt mixture according to claim 1, wherein in the step of rolling the steel slag asphalt mixture, rolling is performed by using staggered wheels, and the distance between two rolling tracks is controlled according to the overlapping distance of 25-35 cm.
8. The method for constructing the upper surface layer of steel slag asphalt mixture according to claim 7, wherein the rolling manners of the initial pressing and the re-pressing are both rolling immediately after the spreading machine, the rolling passes are all 4-5 times, the rolling manner of the final pressing is static pressure polishing until the wheel track is eliminated, and the rolling passes are 1.
9. The construction method of the upper layer of the steel slag asphalt mixture according to claim 1, wherein in the step of setting and treating the construction joint, before the construction completion temperature is not completely reduced on the same day, the tail end of the paving material is manually planed and aligned by an air pick, so that the transverse joint direction is perpendicular to the paving direction, and the transverse joint between the upper layer and the lower layer is staggered by at least 1 m;
the rolling operation at the transverse joint is as follows: firstly, a double-steel-wheel road roller is used for carrying out transverse rolling, the road roller is positioned on a compacted mixed material layer during rolling, the width of the road roller extending into a new paving layer is 12-18cm, then the road roller moves 15-20cm towards the newly paved mixed material after being pressed once until the road roller is completely paved on the new paving layer, and then the road roller is used for carrying out longitudinal rolling.
10. The construction method of the upper layer of steel slag asphalt mixture according to any one of claims 1 to 9, further comprising anti-pollution treatment of road surface and traffic control and open traffic, wherein,
in the road surface anti-pollution treatment step, the uphill road is hardened by concrete, color strip cloth is laid at the uphill road, a waterwheel is arranged to wash the tires of the vehicles, and the vehicles entering and exiting the uphill road are wrapped at the bottom of the vehicle by oilcloth;
the traffic control and open traffic steps are specifically that closed traffic is carried out on the finished asphalt structure layer, all overloaded vehicles are prohibited from passing through the constructed road surface, and the traffic can be opened after the temperature of the road surface is lower than 50 ℃.
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| CN202210476260.0A CN114775357A (en) | 2022-04-29 | 2022-04-29 | Construction method for upper surface layer of steel slag asphalt mixture |
| PCT/CN2022/122073 WO2023020630A1 (en) | 2022-04-29 | 2022-09-28 | Construction method for upper surface course made of steel slag-asphalt mixture |
| SE2350520A SE2350520A1 (en) | 2022-04-29 | 2022-09-28 | Construction method for an upper surface course made of a steel slag-asphalt mixture |
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| WO2023020630A1 (en) * | 2022-04-29 | 2023-02-23 | 中铁四局集团第一工程有限公司 | Construction method for upper surface course made of steel slag-asphalt mixture |
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| CN117024040A (en) * | 2023-08-17 | 2023-11-10 | 保利长大工程有限公司 | High-performance drainage asphalt mixture and drainage pavement paving method thereof |
| CN118271030A (en) * | 2024-02-22 | 2024-07-02 | 北京中交路通科技发展有限公司 | Graphene super-viscous asphalt mixture and preparation method and overlay construction process thereof |
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| SE2350520A1 (en) | 2023-04-28 |
| WO2023020630A1 (en) | 2023-02-23 |
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