CN113417182A - Asphalt pavement paving method capable of reducing air bubbles for highway engineering - Google Patents
Asphalt pavement paving method capable of reducing air bubbles for highway engineering Download PDFInfo
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- CN113417182A CN113417182A CN202110845491.XA CN202110845491A CN113417182A CN 113417182 A CN113417182 A CN 113417182A CN 202110845491 A CN202110845491 A CN 202110845491A CN 113417182 A CN113417182 A CN 113417182A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000003825 pressing Methods 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 24
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 9
- 239000005416 organic matter Substances 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 63
- 238000011049 filling Methods 0.000 claims description 25
- 238000005056 compaction Methods 0.000 claims description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 16
- 239000011707 mineral Substances 0.000 claims description 16
- 239000003921 oil Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003892 spreading Methods 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 10
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- 239000010959 steel Substances 0.000 claims description 9
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- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000010409 ironing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000002829 reductive effect Effects 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000000754 repressing effect Effects 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
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- 238000002474 experimental method Methods 0.000 claims description 3
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- 238000005187 foaming Methods 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000001932 seasonal effect Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 238000011895 specific detection Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 4
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Images
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
- E01C3/00—Foundations for pavings
-
- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
-
- 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
- E01C7/26—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
Abstract
The invention discloses a method for paving an asphalt pavement capable of reducing air bubbles for highway engineering, which is characterized in that when a base pavement is filled, organic matter residues in the area of a roadbed land and turf and surface soil below the original ground are removed, the roadbed land is kept dry, so that the situation that the asphalt cannot be perfectly combined with the base layer to generate air bubbles because the foundation is moist and has moisture after the asphalt pavement is paved is avoided, when an asphalt material is prepared, a trace amount of defoaming agent is added into the asphalt material, so that the air bubbles are not easy to generate after the asphalt pavement is paved, the construction quality and the service performance of the pavement are ensured, after the asphalt pavement is paved, primary pressing, secondary pressing and final pressing are respectively carried out, different rolling devices are respectively adopted for the primary pressing, the secondary pressing and the final pressing, different numbers of passes are rolled by different methods, the mixture is leveled and stabilized, and the mixture is compacted, stabilized and molded to obtain a firm and stable pavement, eliminating wheel tracks and finally forming a road surface meeting the requirements of smooth composite traveling.
Description
Technical Field
The invention relates to the technical field of asphalt pavement construction, in particular to an asphalt pavement laying method capable of reducing air bubbles for highway engineering.
Background
Asphalt pavement refers to various types of pavement that are made by incorporating into mineral materials a road asphalt material. The asphalt binder improves the capability of the paving aggregate to resist damage of traveling vehicles and natural factors to the pavement, and enables the pavement to be smooth, less in dust, impermeable and durable. Accordingly, asphalt pavement is one of the most widely used high-grade pavements in road construction. The asphalt structure layer of asphalt pavement belongs to the category of flexible pavement, but the base layer of the asphalt pavement can also adopt rigid cement concrete or semi-rigid hydraulic material besides flexible material.
Asphalt concrete (Bituminous concrete) is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate with a certain proportion of road asphalt material under strictly controlled conditions. Asphalt concrete can be divided into two categories of petroleum asphalt and coal asphalt according to different binders; some countries or regions also adopt or mix natural asphalt for mixing.
According to the variety of aggregate used, the aggregate can be divided into several types of crushed stone, gravel, sand and slag, and the crushed stone is most commonly used. According to the difference of the maximum particle size of the mixture, the mixture can be divided into coarse particles (below 35-40 mm), medium particles (below 20-25 mm), fine particles (below 10-15 mm), sand particles (below 5-7 mm) and the like.
According to the different gradation of mineral aggregate, the mixture can be divided into dense gradation, semi-open gradation and open gradation, and the open gradation mixture is also called asphalt macadam. The hot-mixed and hot-paved dense-graded broken stone mixture is durable in use, high in strength and good in integrity, is a representative material for building high-grade asphalt pavements, and is most widely applied.
Depending on the composition of the mineral aggregate, a dense-suspended structure (e.g., AC-I), a framework-void structure (e.g., OGFC), and a dense-framework structure (e.g., SMA) can be distinguished.
Different specifications are set for asphalt concrete in various countries, the hot-mix hot-paving asphalt mixture technical specification set by China is called asphalt concrete with the void ratio of 10% or less, and is further divided into I type and II type, the void ratio of the I type is 3 (or 2) -6%, and the I type belongs to a dense-grade matching type; the type II is 6-10%, and belongs to a half-open grading type; the asphalt macadam with the porosity of more than 10 percent belongs to open gradation type; the physical and mechanical indexes of the mixture comprise stability, flow value, void ratio and the like.
The condition that the bituminous pavement under the prior art often can appear producing the bubble in the laying process influences road surface stability for road surface life greatly reduced, road surface takes place the breakage and very easily produces traffic accident.
Disclosure of Invention
The invention aims to provide an asphalt pavement paving method capable of reducing air bubbles for highway engineering, which has the advantages of reducing the generation of paving air bubbles, strong pavement stability and long service life of a highway and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for paving an asphalt pavement capable of reducing air bubbles for highway engineering comprises the following steps:
s1: construction preparation;
s2: filling a base pavement;
s3: preparing an asphalt material;
s4: paving asphalt;
s5: initial pressing;
s6: re-pressing;
s7: final pressing;
s8: detecting and accepting the pavement quality;
s9: and (5) maintaining the road surface.
Further, the step of S1 construction preparation includes:
s101: firstly, designing a selected road surface, including a slope and a turning curve;
s102: inspecting the quality of the roadbed or the underlying asphalt layer, and cleaning or milling and processing the old asphalt pavement or the underlying asphalt layer when the old asphalt pavement or the underlying asphalt layer is polluted;
s103: clear away the debris trees on the design road surface, clear up the road surface completely to fill the pit on the road surface, dig out the arch on the road surface through the instrument, the loose department on road surface is filled and is compressed tightly.
Further, the step of filling the base pavement of S2 includes:
s201: substrate treatment: removing organic matter residues in the range of the land for the roadbed, and turf and surface soil within at least 100-300mm below the original ground, filling and tamping pits in the range of the land for the roadbed, rolling the substrate to ensure that the compactness of the substrate meets the specified requirement, and keeping the land for the roadbed dry;
s202: layered filling: filling and leveling layer by layer from a low position, then filling layer by layer, wherein the same filling layer adopts the same filler, the loose paving thickness of each layer is determined by a field compaction test, and spreading penetrating layer oil;
s203: rolling: the reasonable rolling times are ensured, transverse 45-degree angle cross rolling is adopted, the rolling is uniform without dead angles, the compaction degree is controlled by the compaction times, and the compaction times are determined by field tests.
Further, the step of S3 preparing the asphalt material includes:
s301: adding a trace amount of defoaming agent into the asphalt material, heating by adopting heat conduction oil, adjusting the heating temperature of asphalt and mineral aggregate to meet the requirement of delivery temperature, not using when the bonding is affected due to overhigh temperature, and determining the mixing time of the asphalt material by uniformly mixing and coating all mineral aggregate particles with asphalt binder through trial mixing;
s302: and when the mixed asphalt material is not laid immediately, putting the asphalt material into a finished product bin for storage. The allowed material storage time is subject to the requirement of meeting the paving temperature, but not more than 72 hours;
s303: the asphalt material is preheated before being laid, so that local heating and over-head are avoided, the asphalt material is continuously conveyed into the mixing equipment from the storage tank at a uniform temperature, and asphalt cement which is foaming or is heated to over 160 ℃ is not used.
Further, the step of S4 asphalt paving includes:
s401: before paving, checking and confirming the quality of the lower layer, and when the quality of the lower layer does not meet the requirement or penetrating layer oil is not sprayed according to the specification, not paving an asphalt surface layer;
s402: spreading the asphalt material by a spreading machine, and coating a small amount of diesel oil in a hopper before loading;
s403: when the paver automatically looks for the flat, the middle and lower surface layers adopt a control mode of guiding the elevation by a steel wire at one side;
s404: the paving process is kept slow, uniform and continuous. After the ironing plate is fixed according to the required thickness, the ironing plate is not randomly adjusted;
s405: in the spreading process, repeated manual trimming is not needed. When the joint, the edge local material shortage, the obvious unevenness of the surface, the obvious segregation of the local mixture and the obvious drag mark behind the spreading machine occur, the mixture is manually and locally repaired or replaced.
Further, the step of S5 preliminary pressing includes:
s501: immediately performing primary pressing (high-temperature rolling) after asphalt is paved, and finishing the primary pressing (2 times) by using a static two-wheel road roller, wherein the primary pressing temperature is controlled between 115 ℃ and 140 ℃;
s502: the steel cylinder type road roller with the vibration closed is adopted, so that the use of the tire road roller is avoided, the temperature is high, and deep tire marks and asphalt shift are easy to generate.
Further, the step of S6 repressing includes:
s601: and (3) carrying out re-pressing immediately after the initial pressing, wherein the re-pressing is completed by using a vibratory roller and a tyre roller, the vibratory roller is firstly used for rolling for 3-4 times, the tyre roller is used for rolling for 4-6 times, the compaction degree is reached, and the temperature of the re-pressing link is kept at 110-130 ℃.
Further, the step of S7 finishing pressure includes:
s701: and (4) performing final pressing immediately after the re-pressing is finished, wherein the final pressing is performed by a double-wheel steel cylinder type road roller with vibration closed, the rolling times are 2-3 times, and the temperature of the asphalt pavement after the final pressing is finished is more than 80 ℃.
Further, the step of S8 road surface quality detection and acceptance includes:
s801: and (3) detecting the compactness: before detection, firstly calibrating the quality and density of sand in a cone at the lower part of the barrel indoors, then, conducting a construction site test, wherein the ratio of dry density obtained by a construction site test to laboratory standard and maximum dry density obtained by a laboratory is the compactness, different specified values of the compactness of different structural layers are different, the detection frequency is different, the specified value is qualified, the specified value is larger than or equal to the qualified value, and the specified value is unqualified, if the specified value is unqualified, the reason is checked, analyzed and searched according to specific detection, and corresponding measures are taken;
s802: and (3) measuring a deflection value: each two-lane rated section (not more than 1 km) is checked for 80-100 points, and a representative value, an average value, a standard deviation, etc. are calculated according to a formula. If the deflection representative value is not more than the deflection value of the design requirement, the pavement design factor is checked and corresponding measures are taken;
s803: and (3) detecting the use amount of asphalt: asphalt pavement asphalt dosage was determined according to marshall experiments.
Further, the step of S9 road surface maintenance includes:
s901: initial maintenance: after the paved and compacted asphalt pavement is paved, a layer to be paved is naturally cooled, traffic can be opened after the surface temperature of the mixture is lower than 50 ℃, longitudinal and transverse construction joints are weak links of the asphalt pavement, initial maintenance is reinforced, exposed slight unevenness is searched for by using a three-meter ruler at any time, height is shoveled and lowered, and after napping, the asphalt pavement is leveled and compacted by using a mixture;
s902: traffic control: after the road surface is finished and the traffic is opened, the speed limit of a running vehicle is below 15Km/h, the speed is gradually increased to 20Km/h according to the surface forming condition, a special person is arranged to direct the traffic or a temporary road sign is arranged, the vehicle is controlled to easily rut to run according to the first two sides and the second middle, the comprehensive compaction is achieved, caulks scattered by the running vehicle are swept back, uniformly and compacted at any time to form a smooth and compact upper sealing layer, after the road surface is oiled, caulks the same as the last layer of mineral aggregate in construction are timely distributed, and the running vehicle is controlled to roll;
s903: seasonal maintenance: the asphalt pavement is heated and shrunk in spring, the filling and sealing treatment of the heated and shrunk cracks and other cracks of the asphalt pavement is well carried out, the defects such as pit slots, loosening and slurry turning are repaired in time, the temperature is high in summer, the problems of high temperature and rainwater are noticed, the method is a strong season for asphalt pavement maintenance engineering construction, the high-temperature period is caught to treat the flooding oil, the congestion bags and waves are eradicated, the damage temporarily repaired in the winter, cold and spring rain period is repaired in time, the use quality of the pavement is restored, the asphalt pavement is susceptible to cold air in the autumn and winter, the antifreezing is noticed, and the pit slots and the emulsified asphalt slurry seal layer are repaired in time.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides an asphalt pavement paving method capable of reducing air bubbles for highway engineering, which is characterized in that when a base layer pavement is filled, a substrate is treated, organic matter residues in the area of a roadbed are removed, and turf and surface soil in at least 100-300mm below the original ground are removed, the roadbed is kept dry, so that the situation that the asphalt cannot be perfectly combined with the base layer to generate air bubbles due to damp and moisture of the foundation after the asphalt pavement is paved is avoided.
2. The method for paving the asphalt pavement capable of reducing the bubbles for the highway engineering, disclosed by the invention, has the advantages that when the asphalt material is prepared, a trace amount of defoaming agent is added into the asphalt material, the defoaming agent is composed of a nonionic surfactant such as organic fluorine and a hydroxyl compound, the dispersibility and the defoaming inhibition are excellent, the defoaming speed is high, the foam inhibition is long, the foam inhibition effect on various heavy oil and light oil is good, the bubbles are not easy to generate after the asphalt pavement is paved, and the construction quality and the service performance of the pavement are ensured.
3. The invention provides an asphalt pavement paving method capable of reducing air bubbles for highway engineering, which is characterized in that after asphalt pavement is finished, initial pressure, secondary pressure and final pressure are respectively carried out, different rolling devices are respectively adopted for the initial pressure, the secondary pressure and the final pressure, different times of rolling are carried out by different methods, and a mixture is leveled and stabilized, so that the mixture can be compacted, stabilized and formed, a solid and stable pavement layer is obtained, wheel tracks are eliminated, and a pavement required by a smooth composite traveling crane is finally formed.
Drawings
FIG. 1 is a laying flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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, 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.
Referring to fig. 1, a method for paving an asphalt pavement capable of reducing air bubbles for highway engineering includes the following steps:
s1: construction preparation;
s101: firstly, designing a selected road surface, including a slope and a turning curve;
s102: inspecting the quality of the roadbed or the underlying asphalt layer, and cleaning or milling and processing the old asphalt pavement or the underlying asphalt layer when the old asphalt pavement or the underlying asphalt layer is polluted;
s103: removing sundry trees on the designed road surface, completely cleaning the road surface, filling pits on the road surface, removing bulges on the road surface by using a tool, and filling and pressing loose parts of the road surface;
s2: filling a base pavement;
s201: substrate treatment: clearing away organic matter residues in the range of the land for the roadbed and turf and surface soil within at least 100-300mm below the original ground, filling and tamping pits in the range of the land for the roadbed, rolling the substrate to ensure that the compactness of the substrate meets the specified requirement, and keeping the land for the roadbed dry, so that the asphalt cannot be perfectly combined with the base layer to generate bubbles because the substrate is moist and has moisture after the asphalt pavement is laid;
s202: layered filling: filling and leveling layer by layer from a low position, then filling layer by layer, wherein the same filling layer adopts the same filler, the loose paving thickness of each layer is determined by a field compaction test, and spreading penetrating layer oil;
s203: rolling: ensuring reasonable rolling times, adopting transverse 45-degree angle cross rolling, uniformly rolling without dead angles, controlling the compaction degree by the compaction times, and determining the compaction times by field tests;
s3: preparing an asphalt material;
s301: a trace amount of defoaming agent is added into the asphalt material, the defoaming agent is composed of nonionic surfactants such as organic fluorine and the like and hydroxyl compounds, the dispersion and defoaming performance are excellent, the defoaming speed is high, the foam inhibition is long, the foam inhibition effect is good for various heavy oil and light oil, heat is carried out by adopting heat conduction oil, the heating temperature of asphalt and mineral aggregate is adjusted to meet the requirement of the factory temperature, the asphalt and the mineral aggregate are not used when the bonding is affected due to overhigh temperature, the mixing time of the asphalt material is determined by the mixing time that the asphalt material is uniformly mixed and all mineral aggregate particles are completely coated with asphalt binder, and the asphalt binder is determined by trial mixing;
s302: and when the mixed asphalt material is not laid immediately, putting the asphalt material into a finished product bin for storage. The allowed material storage time is subject to the requirement of meeting the paving temperature, but not more than 72 hours;
s303: the asphalt material is preheated before being laid, so that local heating and over-head are avoided, the asphalt material is continuously sent into the mixing equipment from the storage tank at a uniform temperature, and asphalt cement which is foaming or is heated to over 160 ℃ is not used;
s4: paving asphalt;
s401: before paving, checking and confirming the quality of the lower layer, and when the quality of the lower layer does not meet the requirement or penetrating layer oil is not sprayed according to the specification, not paving an asphalt surface layer;
s402: spreading the asphalt material by a spreading machine, and coating a small amount of diesel oil in a hopper before loading;
s403: when the paver automatically looks for the flat, the middle and lower surface layers adopt a control mode of guiding the elevation by a steel wire at one side;
s404: the paving process is kept slow, uniform and continuous. After the ironing plate is fixed according to the required thickness, the ironing plate is not randomly adjusted;
s405: in the spreading process, repeated manual trimming is not needed. When a joint, a local material shortage at the edge, an obvious uneven surface, an obvious segregation of a local mixture and an obvious drag mark behind a paver occur, the mixture is manually and locally repaired or replaced;
s5: initial pressing;
s501: immediately performing primary pressing (high-temperature rolling) after asphalt is paved, and finishing the primary pressing (2 times) by using a static two-wheel road roller, wherein the primary pressing temperature is controlled between 115 ℃ and 140 ℃;
s502: the steel cylinder type road roller with vibration closed is adopted, the use of a tire road roller is avoided, and at the moment, the temperature is high, deep tire marks and asphalt shift are easily generated, and the mixture is leveled and stabilized;
s6: re-pressing;
s601: carrying out repressing immediately after initial pressing, wherein the repressing is finished by using a vibratory roller and a tyre roller, firstly rolling for 3-4 times by using the vibratory roller, and then rolling for 4-6 times by using the tyre roller to ensure that the compaction degree is reached, and the temperature of a repressing link is kept at 110 plus material temperature of 130 ℃, so that the mixture is compacted, stabilized and molded to obtain a solid and stable pavement layer;
s7: final pressing;
s701: carrying out final pressing immediately after the re-pressing is finished, wherein the final pressing is carried out by a double-wheel steel cylinder type road roller with closed vibration, the rolling times are 2-3 times, the temperature of the asphalt pavement is higher than 80 ℃ after the final pressing is finished, wheel tracks are eliminated, and the pavement required by a smooth composite traveling crane is finally formed;
s8: detecting and accepting the pavement quality;
s801: and (3) detecting the compactness: before detection, firstly calibrating the quality and density of sand in a cone at the lower part of the barrel indoors, then, conducting a construction site test, wherein the ratio of dry density obtained by a construction site test to laboratory standard and maximum dry density obtained by a laboratory is the compactness, different specified values of the compactness of different structural layers are different, the detection frequency is different, the specified value is qualified, the specified value is larger than or equal to the qualified value, and the specified value is unqualified, if the specified value is unqualified, the reason is checked, analyzed and searched according to specific detection, and corresponding measures are taken;
s802: and (3) measuring a deflection value: each two-lane rated section (not more than 1 km) is checked for 80-100 points, and a representative value, an average value, a standard deviation, etc. are calculated according to a formula. If the deflection representative value is not more than the deflection value of the design requirement, the pavement design factor is checked and corresponding measures are taken;
s803: and (3) detecting the use amount of asphalt: determining the asphalt dosage of the asphalt pavement according to a Marshall experiment;
s9: maintaining the pavement;
s901: initial maintenance: after the paved and compacted asphalt pavement is paved, a layer to be paved is naturally cooled, traffic can be opened after the surface temperature of the mixture is lower than 50 ℃, longitudinal and transverse construction joints are weak links of the asphalt pavement, initial maintenance is reinforced, exposed slight unevenness is searched for by using a three-meter ruler at any time, height is shoveled and lowered, and after napping, the asphalt pavement is leveled and compacted by using a mixture;
s902: traffic control: after the road surface is finished and the traffic is opened, the speed limit of a running vehicle is below 15Km/h, the speed is gradually increased to 20Km/h according to the surface forming condition, a special person is arranged to direct the traffic or a temporary road sign is arranged, the vehicle is controlled to easily rut to run according to the first two sides and the second middle, the comprehensive compaction is achieved, caulks scattered by the running vehicle are swept back, uniformly and compacted at any time to form a smooth and compact upper sealing layer, after the road surface is oiled, caulks the same as the last layer of mineral aggregate in construction are timely distributed, and the running vehicle is controlled to roll;
s903: seasonal maintenance: the asphalt pavement is heated and shrunk in spring, the filling and sealing treatment of the heated and shrunk cracks and other cracks of the asphalt pavement is well carried out, the defects such as pit slots, loosening and slurry turning are repaired in time, the temperature is high in summer, the problems of high temperature and rainwater are noticed, the method is a strong season for asphalt pavement maintenance engineering construction, the high-temperature period is caught to treat the flooding oil, the congestion bags and waves are eradicated, the damage temporarily repaired in the winter, cold and spring rain period is repaired in time, the use quality of the pavement is restored, the asphalt pavement is susceptible to cold air in the autumn and winter, the antifreezing is noticed, and the pit slots and the emulsified asphalt slurry seal layer are repaired in time.
In conclusion, the asphalt pavement paving method capable of reducing bubbles for highway engineering is characterized in that when a base pavement is filled, a substrate is treated to remove organic matter residues in the area of a roadbed and turf and surface soil in at least 100-300mm below the original ground, the roadbed is kept dry, so that asphalt cannot be perfectly combined with the base layer to generate bubbles due to the fact that the foundation is moist and has moisture after the asphalt pavement is laid, when an asphalt material is prepared, a trace amount of defoaming agent is added into the asphalt material, the defoaming agent is formed by matching hydroxyl compounds with nonionic surfactants such as organic fluorine and the like, the asphalt pavement paving method has excellent dispersibility and foam eliminating and inhibiting performance, defoaming speed and foam inhibiting length are high, and the asphalt paving method has good foam inhibiting effect on various heavy oil and light oil, so that the bubbles are not easy to generate after the asphalt pavement is laid, and construction quality and service performance of the pavement are guaranteed, after asphalt is paved, the initial pressing, the re-pressing and the final pressing are respectively carried out, different rolling devices are respectively adopted for the initial pressing, the re-pressing and the final pressing, different times of rolling are used for leveling and stabilizing the mixture by different methods, so that the mixture can be compacted, stabilized and molded to obtain a solid and stable pavement layer, the wheel trace is eliminated, and finally the pavement required by the leveling composite traveling crane is formed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. A method for paving an asphalt pavement capable of reducing bubbles for highway engineering is characterized by comprising the following steps:
s1: construction preparation;
s2: filling a base pavement;
s3: preparing an asphalt material;
s4: paving asphalt;
s5: initial pressing;
s6: re-pressing;
s7: final pressing;
s8: detecting and accepting the pavement quality;
s9: and (5) maintaining the road surface.
2. The method of claim 1, wherein the step of S1 preparation for construction comprises:
s101: firstly, designing a selected road surface, including a slope and a turning curve;
s102: inspecting the quality of the roadbed or the underlying asphalt layer, and cleaning or milling and processing the old asphalt pavement or the underlying asphalt layer when the old asphalt pavement or the underlying asphalt layer is polluted;
s103: clear away the debris trees on the design road surface, clear up the road surface completely to fill the pit on the road surface, dig out the arch on the road surface through the instrument, the loose department on road surface is filled and is compressed tightly.
3. The method for paving an asphalt pavement for road engineering with reduced air bubbles according to claim 1, wherein the step of filling the S2 base pavement comprises:
s201: substrate treatment: removing organic matter residues in the range of the land for the roadbed, and turf and surface soil within at least 100-300mm below the original ground, filling and tamping pits in the range of the land for the roadbed, rolling the substrate to ensure that the compactness of the substrate meets the specified requirement, and keeping the land for the roadbed dry;
s202: layered filling: filling and leveling layer by layer from a low position, then filling layer by layer, wherein the same filling layer adopts the same filler, the loose paving thickness of each layer is determined by a field compaction test, and spreading penetrating layer oil;
s203: rolling: the reasonable rolling times are ensured, transverse 45-degree angle cross rolling is adopted, the rolling is uniform without dead angles, the compaction degree is controlled by the compaction times, and the compaction times are determined by field tests.
4. The method for laying an asphalt pavement for road engineering with reduced air bubbles according to claim 1, wherein the step of preparing S3 asphalt material comprises:
s301: adding a trace amount of defoaming agent into the asphalt material, heating by adopting heat conduction oil, adjusting the heating temperature of asphalt and mineral aggregate to meet the requirement of delivery temperature, not using when the bonding is affected due to overhigh temperature, and determining the mixing time of the asphalt material by uniformly mixing and coating all mineral aggregate particles with asphalt binder through trial mixing;
s302: when the mixed asphalt material is not laid immediately, the asphalt material is placed into a finished product bin for storage, and the storage time is allowed to be based on meeting the paving temperature requirement, but not to exceed 72 hours;
s303: the asphalt material is preheated before being laid, so that local heating and over-head are avoided, the asphalt material is continuously conveyed into the mixing equipment from the storage tank at a uniform temperature, and asphalt cement which is foaming or is heated to over 160 ℃ is not used.
5. The method for laying an asphalt pavement for road engineering with reduced air bubbles according to claim 1, wherein the step of S4 asphalt laying comprises:
s401: before paving, checking and confirming the quality of the lower layer, and when the quality of the lower layer does not meet the requirement or penetrating layer oil is not sprayed according to the specification, not paving an asphalt surface layer;
s402: spreading the asphalt material by a spreading machine, and coating a small amount of diesel oil in a hopper before loading;
s403: when the paver automatically looks for the flat, the middle and lower surface layers adopt a control mode of guiding the elevation by a steel wire at one side;
s404: the paving process is kept slow, uniform and continuous. After the ironing plate is fixed according to the required thickness, the ironing plate is not randomly adjusted;
s405: in the spreading process, repeated manual trimming is not needed. When the joint, the edge local material shortage, the obvious unevenness of the surface, the obvious segregation of the local mixture and the obvious drag mark behind the spreading machine occur, the mixture is manually and locally repaired or replaced.
6. The method for laying an asphalt pavement for road engineering with reduced air bubbles according to claim 1, wherein the step of S5 preliminary pressure comprises:
s501: immediately performing primary pressing after asphalt paving, and finishing by using a static two-wheel road roller, wherein the primary pressing temperature is controlled to be between 115 ℃ and 140 ℃;
s502: the steel cylinder type road roller with the vibration closed is adopted, so that the use of the tire road roller is avoided, the temperature is high, and deep tire marks and asphalt shift are easy to generate.
7. The method for laying an asphalt pavement for road engineering capable of reducing air bubbles according to claim 1, wherein the step of S6 repressing comprises:
s601: and (3) carrying out re-pressing immediately after the initial pressing, wherein the re-pressing is completed by using a vibratory roller and a tyre roller, the vibratory roller is firstly used for rolling for 3-4 times, the tyre roller is used for rolling for 4-6 times, the compaction degree is reached, and the temperature of the re-pressing link is kept at 110-130 ℃.
8. The method of claim 7, wherein the final pressure step comprises:
s701: and (4) performing final pressing immediately after the re-pressing is finished, wherein the final pressing is performed by a double-wheel steel cylinder type road roller with vibration closed, the rolling times are 2-3 times, and the temperature of the asphalt pavement after the final pressing is finished is more than 80 ℃.
9. The method for paving an asphalt pavement capable of reducing air bubbles for road engineering according to claim 1, wherein the step of S8 inspecting and accepting the pavement quality comprises:
s801: and (3) detecting the compactness: before detection, firstly calibrating the quality and density of sand in a cone at the lower part of the barrel indoors, then, conducting a construction site test, wherein the ratio of dry density obtained by a construction site test to laboratory standard and maximum dry density obtained by a laboratory is the compactness, different specified values of the compactness of different structural layers are different, the detection frequency is different, the specified value is qualified, the specified value is larger than or equal to the qualified value, and the specified value is unqualified, if the specified value is unqualified, the reason is checked, analyzed and searched according to specific detection, and corresponding measures are taken;
s802: and (3) measuring a deflection value: checking 80-100 points of each double-lane evaluation road section, calculating representative values, an average value and a standard deviation according to a formula, wherein the representative values of deflection are qualified when the representative values of deflection are not more than the deflection values required by the design, and are unqualified when the representative values of deflection are more than the deflection values required by the design, and if the representative values of deflection are not more than the deflection values required by the design, checking road surface design factors and taking corresponding measures;
s803: and (3) detecting the use amount of asphalt: asphalt pavement asphalt dosage was determined according to marshall experiments.
10. The method for paving an asphalt pavement for road engineering with reduced air bubbles according to claim 1, wherein the step of S9 pavement maintenance comprises:
s901: initial maintenance: after the paved and compacted asphalt pavement is paved, a layer to be paved is naturally cooled, traffic can be opened after the surface temperature of the mixture is lower than 50 ℃, longitudinal and transverse construction joints are weak links of the asphalt pavement, initial maintenance is reinforced, exposed slight unevenness is searched for by using a three-meter ruler at any time, height is shoveled and lowered, and after napping, the asphalt pavement is leveled and compacted by using a mixture;
s902: traffic control: after the road surface is finished and the traffic is opened, the speed limit of a running vehicle is below 15Km/h, the speed is gradually increased to 20Km/h according to the surface forming condition, a special person is arranged to direct the traffic or a temporary road sign is arranged, the vehicle is controlled to easily rut to run according to the first two sides and the second middle, the comprehensive compaction is achieved, caulks scattered by the running vehicle are swept back, uniformly and compacted at any time to form a smooth and compact upper sealing layer, after the road surface is oiled, caulks the same as the last layer of mineral aggregate in construction are timely distributed, and the running vehicle is controlled to roll;
s903: seasonal maintenance: the asphalt pavement is heated and shrunk more in spring, filling and sealing treatment of the heated and shrunk cracks and other cracks of the asphalt pavement is well carried out, pits are repaired in time, loosening and slurry turning are carried out, the temperature in summer is high, the high-temperature period is grasped for treating oil flashing, a user bag and waves are eradicated, damage temporarily repaired in winter and cold spring and rain periods is repaired in time, the use quality of the pavement is restored, the asphalt pavement is susceptible to cold air in autumn and winter, and the pits and the emulsified asphalt slurry seal layer are repaired in time by paying attention to freeze prevention.
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